[PATCH 00/11 v3] add PNG support

[PATCH 00/11 v3] add PNG support

[Jean-Christophe PLAGNIOL-VILLARD]

Hi,

	v3:
	 - fix comment
	 - add introduce image helper
	   while use the image renderer for multiple
	   image support I found tis was missing

	   This even simplify png implemtation by not duplication the
	   rendering

	v2:

	 fix comment
	 fix missing select
	 drop logo (will be send in a seprated pull)

please pull

The following changes since commit 298d15571da8d1cb71e7fd87cc53cad3b2bf1d12:

  i.MX51: unbreak FEC iomux (2012-09-07 10:28:17 +0200)

are available in the git repository at:

  git://git.jcrosoft.org/barebox.git tags/png

for you to fetch changes up to 832e83c040dfa41b64ba5307d8f31218ff600934:

  png: add picoPNG lib support (2012-09-09 01:56:27 +0800)

----------------------------------------------------------------
Introduce PNG support

This will allow to reduce the binary size and support transparent image
png + png8 is 50% less than lzo + bmp (same image)

 - rename bmp to splash
 - add background support (usefull for transparent image)
 - add LodePNG and PicoPNG

PicoPNG only support PNG8 RGBA where LodePNG support most of the PNG (PNG24 &
PNG8). PicoPNG is ~5KiB smaller than LodePNG.

Attention the coding style on both PicoPNG and LodePNG are untouched for
maintainance purpose.

Use LodePNG version 20120729 from http://lodev.org/lodepng/
Use from http://forge.voodooprojects.org/
which is base on picoPNG C++ wrote by Lode Vandevenne. The same author as
LodePNG.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

----------------------------------------------------------------
Jean-Christophe PLAGNIOL-VILLARD (11):
      bmp: rename it to splash
      bmp: split bmp rending in lib/bmp.c
      introduce image_renderer framework
      filetype: add BMP support
      splash/bmp: switch to image_renderer
      splash: add support to set a background color
      Introduce graphic utils
      graphic_utils: add rgba support
      filetype: add PNG support
      add PNG support
      png: add picoPNG lib support

 Documentation/commands.dox                         |    2 +-
 arch/arm/boards/eukrea_cpuimx25/env/bin/init_board |    4 +-
 arch/arm/boards/eukrea_cpuimx27/env/bin/init       |    4 +-
 arch/arm/boards/eukrea_cpuimx35/env/bin/init_board |    4 +-
 arch/arm/boards/eukrea_cpuimx51/env/bin/init_board |    4 +-
 arch/arm/boards/karo-tx25/env/bin/init_board       |    2 +-
 arch/arm/boards/mioa701/env/bin/init               |    2 +-
 arch/arm/configs/chumbyone_defconfig               |    2 +-
 arch/arm/configs/cupid_defconfig                   |    2 +-
 arch/arm/configs/eukrea_cpuimx25_defconfig         |    2 +-
 arch/arm/configs/eukrea_cpuimx27_defconfig         |    2 +-
 arch/arm/configs/eukrea_cpuimx35_defconfig         |    2 +-
 arch/arm/configs/freescale_mx35_3stack_defconfig   |    2 +-
 arch/arm/configs/imx28evk_defconfig                |    2 +-
 arch/arm/configs/mioa701_defconfig                 |    2 +-
 arch/arm/configs/neso_defconfig                    |    2 +-
 arch/arm/configs/pcm027_defconfig                  |    2 +-
 arch/arm/configs/pcm038_defconfig                  |    2 +-
 arch/arm/configs/tx25stk5_defconfig                |    2 +-
 arch/arm/configs/tx28stk5_defconfig                |    2 +-
 commands/Kconfig                                   |    5 +-
 commands/Makefile                                  |    2 +-
 commands/bmp.c                                     |  221 ---
 commands/splash.c                                  |  133 ++
 common/filetype.c                                  |    5 +
 include/filetype.h                                 |    2 +
 include/graphic_utils.h                            |   17 +
 include/image_renderer.h                           |   85 +
 lib/Kconfig                                        |   35 +
 lib/Makefile                                       |    6 +
 lib/bmp.c                                          |  134 ++
 {include => lib}/bmp_layout.h                      |   11 +
 lib/graphic_utils.c                                |  191 +++
 lib/image_renderer.c                               |   96 ++
 lib/lodepng.c                                      | 5928 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/lodepng.h                                      | 1640 +++++++++++++++++++
 lib/picopng.c                                      |  810 ++++++++++
 lib/picopng.h                                      |   34 +
 lib/png.c                                          |   89 ++
 lib/png.h                                          |   21 +
 lib/png_lode.c                                     |   90 ++
 lib/png_pico.c                                     |   85 +
 42 files changed, 9440 insertions(+), 248 deletions(-)
 delete mode 100644 commands/bmp.c
 create mode 100644 commands/splash.c
 create mode 100644 include/graphic_utils.h
 create mode 100644 include/image_renderer.h
 create mode 100644 lib/bmp.c
 rename {include => lib}/bmp_layout.h (85%)
 create mode 100644 lib/graphic_utils.c
 create mode 100644 lib/image_renderer.c
 create mode 100644 lib/lodepng.c
 create mode 100644 lib/lodepng.h
 create mode 100644 lib/picopng.c
 create mode 100644 lib/picopng.h
 create mode 100644 lib/png.c
 create mode 100644 lib/png.h
 create mode 100644 lib/png_lode.c
 create mode 100644 lib/png_pico.c

Best Regards,
J.

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[PATCH 01/11] bmp: rename it to splash

[Jean-Christophe PLAGNIOL-VILLARD]

so be can add more format support

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 Documentation/commands.dox                         |    2 +-
 arch/arm/boards/eukrea_cpuimx25/env/bin/init_board |    4 ++--
 arch/arm/boards/eukrea_cpuimx27/env/bin/init       |    4 ++--
 arch/arm/boards/eukrea_cpuimx35/env/bin/init_board |    4 ++--
 arch/arm/boards/eukrea_cpuimx51/env/bin/init_board |    4 ++--
 arch/arm/boards/karo-tx25/env/bin/init_board       |    2 +-
 arch/arm/boards/mioa701/env/bin/init               |    2 +-
 arch/arm/configs/chumbyone_defconfig               |    2 +-
 arch/arm/configs/cupid_defconfig                   |    2 +-
 arch/arm/configs/eukrea_cpuimx25_defconfig         |    2 +-
 arch/arm/configs/eukrea_cpuimx27_defconfig         |    2 +-
 arch/arm/configs/eukrea_cpuimx35_defconfig         |    2 +-
 arch/arm/configs/freescale_mx35_3stack_defconfig   |    2 +-
 arch/arm/configs/imx28evk_defconfig                |    2 +-
 arch/arm/configs/mioa701_defconfig                 |    2 +-
 arch/arm/configs/neso_defconfig                    |    2 +-
 arch/arm/configs/pcm027_defconfig                  |    2 +-
 arch/arm/configs/pcm038_defconfig                  |    2 +-
 arch/arm/configs/tx25stk5_defconfig                |    2 +-
 arch/arm/configs/tx28stk5_defconfig                |    2 +-
 commands/Kconfig                                   |    4 ++--
 commands/Makefile                                  |    2 +-
 commands/{bmp.c => splash.c}                       |   12 ++++++------
 23 files changed, 33 insertions(+), 33 deletions(-)
 rename commands/{bmp.c => splash.c} (95%)

diff --git a/Documentation/commands.dox b/Documentation/commands.dox
index 5ef7829..d8cfa6b 100644
--- a/Documentation/commands.dox
+++ b/Documentation/commands.dox
@@ -18,7 +18,6 @@ available in @a Barebox:
 @li @subpage _name
 @li @subpage addpart_command
 @li @subpage alternate
-@li @subpage bmp_command
 @li @subpage bootm_command
 @li @subpage bootu
 @li @subpage bootz
@@ -95,6 +94,7 @@ available in @a Barebox:
 @li @subpage sh
 @li @subpage sleep
 @li @subpage source
+@li @subpage splash_command
 @li @subpage test
 @li @subpage timeout
 @li @subpage true
diff --git a/arch/arm/boards/eukrea_cpuimx25/env/bin/init_board b/arch/arm/boards/eukrea_cpuimx25/env/bin/init_board
index ff3365d..58e07e0 100644
--- a/arch/arm/boards/eukrea_cpuimx25/env/bin/init_board
+++ b/arch/arm/boards/eukrea_cpuimx25/env/bin/init_board
@@ -1,11 +1,11 @@
 #!/bin/sh
 
 if [ -f /env/logo.bmp ]; then
-	bmp /env/logo.bmp
+	splash /env/logo.bmp
 	fb0.enable=1
 elif [ -f /env/logo.bmp.lzo ]; then
 	uncompress /env/logo.bmp.lzo /logo.bmp
-	bmp /logo.bmp
+	splash /logo.bmp
 	fb0.enable=1
 fi
 
diff --git a/arch/arm/boards/eukrea_cpuimx27/env/bin/init b/arch/arm/boards/eukrea_cpuimx27/env/bin/init
index f84ace9..cd74974 100644
--- a/arch/arm/boards/eukrea_cpuimx27/env/bin/init
+++ b/arch/arm/boards/eukrea_cpuimx27/env/bin/init
@@ -17,11 +17,11 @@ if [ -e /dev/nand0 ]; then
 fi
 
 if [ -f /env/logo.bmp ]; then
-	bmp /env/logo.bmp
+	splash /env/logo.bmp
 	fb0.enable=1
 elif [ -f /env/logo.bmp.lzo ]; then
 	uncompress /env/logo.bmp.lzo /logo.bmp
-	bmp /logo.bmp
+	splash /logo.bmp
 	fb0.enable=1
 fi
 
diff --git a/arch/arm/boards/eukrea_cpuimx35/env/bin/init_board b/arch/arm/boards/eukrea_cpuimx35/env/bin/init_board
index 89fd9a9..2a07a84 100644
--- a/arch/arm/boards/eukrea_cpuimx35/env/bin/init_board
+++ b/arch/arm/boards/eukrea_cpuimx35/env/bin/init_board
@@ -1,12 +1,12 @@
 #!/bin/sh
 
 if [ -f /env/logo.bmp ]; then
-	bmp /env/logo.bmp
+	splash /env/logo.bmp
 	fb0.enable=1
 	gpio_set_value 1 1
 elif [ -f /env/logo.bmp.lzo ]; then
 	uncompress /env/logo.bmp.lzo /logo.bmp
-	bmp /logo.bmp
+	splash /logo.bmp
 	fb0.enable=1
 	gpio_set_value 1 1
 fi
diff --git a/arch/arm/boards/eukrea_cpuimx51/env/bin/init_board b/arch/arm/boards/eukrea_cpuimx51/env/bin/init_board
index cb624e5..0af6582 100644
--- a/arch/arm/boards/eukrea_cpuimx51/env/bin/init_board
+++ b/arch/arm/boards/eukrea_cpuimx51/env/bin/init_board
@@ -1,12 +1,12 @@
 #!/bin/sh
 
 if [ -f /env/logo.bmp ]; then
-	bmp /env/logo.bmp
+	splash /env/logo.bmp
 	fb0.enable=1
 	gpio_set_value 1 1
 elif [ -f /env/logo.bmp.lzo ]; then
 	uncompress /env/logo.bmp.lzo /logo.bmp
-	bmp /logo.bmp
+	splash /logo.bmp
 	fb0.enable=1
 	gpio_set_value 1 1
 fi
diff --git a/arch/arm/boards/karo-tx25/env/bin/init_board b/arch/arm/boards/karo-tx25/env/bin/init_board
index b17c55d..1f35c96 100644
--- a/arch/arm/boards/karo-tx25/env/bin/init_board
+++ b/arch/arm/boards/karo-tx25/env/bin/init_board
@@ -1,6 +1,6 @@
 
 if [ -e /dev/fb0 -a -e /env/splash.bmp ]; then
-	bmp /env/splash.bmp
+	splash /env/splash.bmp
 	fb0.enable=1
 fi
 
diff --git a/arch/arm/boards/mioa701/env/bin/init b/arch/arm/boards/mioa701/env/bin/init
index 494d067..ab5d84d 100644
--- a/arch/arm/boards/mioa701/env/bin/init
+++ b/arch/arm/boards/mioa701/env/bin/init
@@ -12,7 +12,7 @@ led keyboard 0
 sdcard_override
 
 fb0.enable=1
-bmp /dev/mtd0.barebox-logo
+splash /dev/mtd0.barebox-logo
 
 mtd_env_override
 if [ $? = 0 ]; then
diff --git a/arch/arm/configs/chumbyone_defconfig b/arch/arm/configs/chumbyone_defconfig
index 33d83a8..1b03530 100644
--- a/arch/arm/configs/chumbyone_defconfig
+++ b/arch/arm/configs/chumbyone_defconfig
@@ -30,7 +30,7 @@ CONFIG_CMD_RESET=y
 CONFIG_CMD_GO=y
 CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_NET=y
 CONFIG_NET_DHCP=y
diff --git a/arch/arm/configs/cupid_defconfig b/arch/arm/configs/cupid_defconfig
index 28d199b..d7716ea 100644
--- a/arch/arm/configs/cupid_defconfig
+++ b/arch/arm/configs/cupid_defconfig
@@ -45,7 +45,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_NET=y
diff --git a/arch/arm/configs/eukrea_cpuimx25_defconfig b/arch/arm/configs/eukrea_cpuimx25_defconfig
index f7207e8..5eb4ff3 100644
--- a/arch/arm/configs/eukrea_cpuimx25_defconfig
+++ b/arch/arm/configs/eukrea_cpuimx25_defconfig
@@ -43,7 +43,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_CMD_I2C=y
diff --git a/arch/arm/configs/eukrea_cpuimx27_defconfig b/arch/arm/configs/eukrea_cpuimx27_defconfig
index 93de428..2b95156 100644
--- a/arch/arm/configs/eukrea_cpuimx27_defconfig
+++ b/arch/arm/configs/eukrea_cpuimx27_defconfig
@@ -31,7 +31,7 @@ CONFIG_CMD_RESET=y
 CONFIG_CMD_GO=y
 CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_CMD_I2C=y
diff --git a/arch/arm/configs/eukrea_cpuimx35_defconfig b/arch/arm/configs/eukrea_cpuimx35_defconfig
index 880beb6..16ef4cc 100644
--- a/arch/arm/configs/eukrea_cpuimx35_defconfig
+++ b/arch/arm/configs/eukrea_cpuimx35_defconfig
@@ -44,7 +44,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_CMD_I2C=y
diff --git a/arch/arm/configs/freescale_mx35_3stack_defconfig b/arch/arm/configs/freescale_mx35_3stack_defconfig
index a60658d..4052325 100644
--- a/arch/arm/configs/freescale_mx35_3stack_defconfig
+++ b/arch/arm/configs/freescale_mx35_3stack_defconfig
@@ -42,7 +42,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_CMD_I2C=y
diff --git a/arch/arm/configs/imx28evk_defconfig b/arch/arm/configs/imx28evk_defconfig
index 1b44cf4..f4d4661 100644
--- a/arch/arm/configs/imx28evk_defconfig
+++ b/arch/arm/configs/imx28evk_defconfig
@@ -33,7 +33,7 @@ CONFIG_CMD_RESET=y
 CONFIG_CMD_GO=y
 CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_NET=y
 CONFIG_NET_DHCP=y
diff --git a/arch/arm/configs/mioa701_defconfig b/arch/arm/configs/mioa701_defconfig
index 2bb3cec..5f06b3c 100644
--- a/arch/arm/configs/mioa701_defconfig
+++ b/arch/arm/configs/mioa701_defconfig
@@ -38,7 +38,7 @@ CONFIG_CMD_BOOTM_INITRD=y
 CONFIG_CMD_RESET=y
 CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_CMD_LED=y
diff --git a/arch/arm/configs/neso_defconfig b/arch/arm/configs/neso_defconfig
index 5744dc1..3ea6891 100644
--- a/arch/arm/configs/neso_defconfig
+++ b/arch/arm/configs/neso_defconfig
@@ -45,7 +45,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_NET=y
diff --git a/arch/arm/configs/pcm027_defconfig b/arch/arm/configs/pcm027_defconfig
index 9760e66..5a65a72 100644
--- a/arch/arm/configs/pcm027_defconfig
+++ b/arch/arm/configs/pcm027_defconfig
@@ -43,7 +43,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_NET=y
diff --git a/arch/arm/configs/pcm038_defconfig b/arch/arm/configs/pcm038_defconfig
index 5ce4f7a..bab4002 100644
--- a/arch/arm/configs/pcm038_defconfig
+++ b/arch/arm/configs/pcm038_defconfig
@@ -49,7 +49,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_NET=y
diff --git a/arch/arm/configs/tx25stk5_defconfig b/arch/arm/configs/tx25stk5_defconfig
index 99057c2..e098ef8 100644
--- a/arch/arm/configs/tx25stk5_defconfig
+++ b/arch/arm/configs/tx25stk5_defconfig
@@ -45,7 +45,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_NET=y
diff --git a/arch/arm/configs/tx28stk5_defconfig b/arch/arm/configs/tx28stk5_defconfig
index b4e3747..49a0ab3 100644
--- a/arch/arm/configs/tx28stk5_defconfig
+++ b/arch/arm/configs/tx28stk5_defconfig
@@ -41,7 +41,7 @@ CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
 CONFIG_CMD_MAGICVAR=y
 CONFIG_CMD_MAGICVAR_HELP=y
-CONFIG_CMD_BMP=y
+CONFIG_CMD_SPLASH=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_NET=y
diff --git a/commands/Kconfig b/commands/Kconfig
index f2756cc..c4623fa 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -535,10 +535,10 @@ config CMD_LSMOD
 	depends on MODULES
 	prompt "lsmod"
 
-config CMD_BMP
+config CMD_SPLASH
 	bool
 	depends on VIDEO
-	prompt "bmp"
+	prompt "splash"
 	help
 	  show bmp files on framebuffer devices
 
diff --git a/commands/Makefile b/commands/Makefile
index ccebd7f..24bf46a 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -49,7 +49,7 @@ obj-$(CONFIG_CMD_VERSION)	+= version.o
 obj-$(CONFIG_CMD_HELP)		+= help.o
 obj-$(CONFIG_CMD_LSMOD)		+= lsmod.o
 obj-$(CONFIG_CMD_INSMOD)	+= insmod.o
-obj-$(CONFIG_CMD_BMP)		+= bmp.o
+obj-$(CONFIG_CMD_SPLASH)	+= splash.o
 obj-$(CONFIG_USB_GADGET_DFU)	+= dfu.o
 obj-$(CONFIG_USB_GADGET_SERIAL)	+= usbserial.o
 obj-$(CONFIG_CMD_GPIO)		+= gpio.o
diff --git a/commands/bmp.c b/commands/splash.c
similarity index 95%
rename from commands/bmp.c
rename to commands/splash.c
index 4130474..6526b20 100644
--- a/commands/bmp.c
+++ b/commands/splash.c
@@ -30,7 +30,7 @@ static inline void set_pixel(struct fb_info *info, void *adr, int r, int g, int
 	}
 }
 
-static int do_bmp(int argc, char *argv[])
+static int do_splash(int argc, char *argv[])
 {
 	int ret, opt, fd;
 	char *fbdev = "/dev/fb0";
@@ -194,8 +194,8 @@ failed_memmap:
 	return 1;
 }
 
-BAREBOX_CMD_HELP_START(bmp)
-BAREBOX_CMD_HELP_USAGE("bmp [OPTIONS] FILE\n")
+BAREBOX_CMD_HELP_START(splash)
+BAREBOX_CMD_HELP_USAGE("splash [OPTIONS] FILE\n")
 BAREBOX_CMD_HELP_SHORT("Show the bitmap FILE on the framebuffer.\n")
 BAREBOX_CMD_HELP_OPT  ("-f <fb>",   "framebuffer device (/dev/fb0)\n")
 BAREBOX_CMD_HELP_OPT  ("-x <xofs>", "x offset (default center)\n")
@@ -214,8 +214,8 @@ color depth.
 
  */
 
-BAREBOX_CMD_START(bmp)
-	.cmd		= do_bmp,
+BAREBOX_CMD_START(splash)
+	.cmd		= do_splash,
 	.usage		= "show a bmp image",
-	BAREBOX_CMD_HELP(cmd_bmp_help)
+	BAREBOX_CMD_HELP(cmd_splash_help)
 BAREBOX_CMD_END
-- 
1.7.10.4


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[PATCH 02/11] bmp: split bmp rending in lib/bmp.c

[Jean-Christophe PLAGNIOL-VILLARD]

So we can add other format support

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 commands/Kconfig     |    1 +
 commands/splash.c    |  124 +++++------------------------------------------
 include/bmp_layout.h |   11 +++++
 lib/Kconfig          |    3 ++
 lib/Makefile         |    1 +
 lib/bmp.c            |  132 ++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 159 insertions(+), 113 deletions(-)
 create mode 100644 lib/bmp.c

diff --git a/commands/Kconfig b/commands/Kconfig
index c4623fa..9107a3e 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -538,6 +538,7 @@ config CMD_LSMOD
 config CMD_SPLASH
 	bool
 	depends on VIDEO
+	select BMP
 	prompt "splash"
 	help
 	  show bmp files on framebuffer devices
diff --git a/commands/splash.c b/commands/splash.c
index 6526b20..ad73778 100644
--- a/commands/splash.c
+++ b/commands/splash.c
@@ -8,43 +8,18 @@
 #include <fcntl.h>
 #include <fb.h>
 #include <bmp_layout.h>
-#include <asm/byteorder.h>
-
-static inline void set_pixel(struct fb_info *info, void *adr, int r, int g, int b)
-{
-	u32 px;
-
-	px = (r >> (8 - info->red.length)) << info->red.offset |
-		(g >> (8 - info->green.length)) << info->green.offset |
-		(b >> (8 - info->blue.length)) << info->blue.offset;
-
-	switch (info->bits_per_pixel) {
-	case 8:
-		break;
-	case 16:
-		*(u16 *)adr = px;
-		break;
-	case 32:
-		*(u32 *)adr = px;
-		break;
-	}
-}
 
 static int do_splash(int argc, char *argv[])
 {
 	int ret, opt, fd;
 	char *fbdev = "/dev/fb0";
-	void *fb, *offscreenbuf = NULL;
+	void *fb;
 	struct fb_info info;
-	struct bmp_image *bmp;
 	char *bmpfile;
-	int bmpsize;
-	char *image;
-	int sw, sh, width, height, startx = -1, starty = -1;
-	int bits_per_pixel, fbsize;
+	int startx = -1, starty = -1;
 	int xres, yres;
 	int offscreen = 0;
-	void *adr, *buf;
+	void *offscreenbuf = NULL;
 
 	while((opt = getopt(argc, argv, "f:x:y:o")) > 0) {
 		switch(opt) {
@@ -88,105 +63,28 @@ static int do_splash(int argc, char *argv[])
 	xres = info.xres;
 	yres = info.yres;
 
-	bmp = read_file(bmpfile, &bmpsize);
-	if (!bmp) {
-		printf("unable to read %s\n", bmpfile);
-		goto failed_memmap;
-	}
-
-	if (bmp->header.signature[0] != 'B' ||
-	      bmp->header.signature[1] != 'M') {
-		printf("No valid bmp file\n");
-	}
-
-	sw = le32_to_cpu(bmp->header.width);
-	sh = le32_to_cpu(bmp->header.height);
-
-	if (startx < 0) {
-		startx = (xres - sw) / 2;
-		if (startx < 0)
-			startx = 0;
-	}
-
-	if (starty < 0) {
-		starty = (yres - sh) / 2;
-		if (starty < 0)
-			starty = 0;
-	}
-
-	width = min(sw, xres - startx);
-	height = min(sh, yres - starty);
-
-	bits_per_pixel = le16_to_cpu(bmp->header.bit_count);
-	fbsize = xres * yres * (info.bits_per_pixel >> 3);
-
 	if (offscreen) {
+		int fbsize;
 		/* Don't fail if malloc fails, just continue rendering directly
 		 * on the framebuffer
 		 */
+
+		fbsize = xres * yres * (info.bits_per_pixel >> 3);
 		offscreenbuf = malloc(fbsize);
 		if (offscreenbuf)
 			memcpy(offscreenbuf, fb, fbsize);
 	}
 
-	buf = offscreenbuf ? offscreenbuf : fb;
-
-	if (bits_per_pixel == 8) {
-		int x, y;
-		struct bmp_color_table_entry *color_table = bmp->color_table;
-
-		for (y = 0; y < height; y++) {
-			image = (char *)bmp +
-					le32_to_cpu(bmp->header.data_offset);
-			image += (sh - y - 1) * sw * (bits_per_pixel >> 3);
-			adr = buf + ((y + starty) * xres + startx) *
-					(info.bits_per_pixel >> 3);
-			for (x = 0; x < width; x++) {
-				int pixel;
+	if (bmp_render_file(&info, bmpfile, fb, startx, starty, xres, yres,
+			    offscreenbuf) < 0)
+		ret = 1;
 
-				pixel = *image;
-
-				set_pixel(&info, adr, color_table[pixel].red,
-						color_table[pixel].green,
-						color_table[pixel].blue);
-				adr += info.bits_per_pixel >> 3;
-
-				image += bits_per_pixel >> 3;
-			}
-		}
-	} else if (bits_per_pixel == 24) {
-		int x, y;
-
-		for (y = 0; y < height; y++) {
-			image = (char *)bmp +
-					le32_to_cpu(bmp->header.data_offset);
-			image += (sh - y - 1) * sw * (bits_per_pixel >> 3);
-			adr = buf + ((y + starty) * xres + startx) *
-					(info.bits_per_pixel >> 3);
-			for (x = 0; x < width; x++) {
-				char *pixel;
-
-				pixel = image;
-
-				set_pixel(&info, adr, pixel[2], pixel[1],
-						pixel[0]);
-				adr += info.bits_per_pixel >> 3;
-
-				image += bits_per_pixel >> 3;
-			}
-		}
-	} else
-		printf("bmp: illegal bits per pixel value: %d\n", bits_per_pixel);
-
-	if (offscreenbuf) {
-		memcpy(fb, offscreenbuf, fbsize);
+	if (offscreenbuf)
 		free(offscreenbuf);
-	}
 
-	free(bmp);
 	close(fd);
 
-	return 0;
+	return ret;
 
 failed_memmap:
 	close(fd);
diff --git a/include/bmp_layout.h b/include/bmp_layout.h
index 63c5564..b5472dd 100644
--- a/include/bmp_layout.h
+++ b/include/bmp_layout.h
@@ -74,4 +74,15 @@ struct bmp_image {
 #define BMP_BI_RLE8	1
 #define BMP_BI_RLE4	2
 
+#ifdef CONFIG_BMP
+int bmp_render_file(struct fb_info *info, const char* bmpfile, void* fb,
+		    int startx, int starty, int xres, int yres, void* offscreenbuf);
+#else
+static inline int bmp_render_file(struct fb_info *info, const char* bmpfile, void* fb,
+		    int startx, int starty, int xres, int yres, void* offscreenbuf)
+{
+	return -ENOSYS;
+}
+#endif
+
 #endif							/* _BMP_H_ */
diff --git a/lib/Kconfig b/lib/Kconfig
index 32634df..93e360b 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -38,4 +38,7 @@ config BITREV
 config QSORT
 	bool
 
+config BMP
+	bool
+
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index 4e6b1ee..df4b5e5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -34,3 +34,4 @@ obj-$(CONFIG_UNCOMPRESS)	+= uncompress.o
 obj-$(CONFIG_BCH)	+= bch.o
 obj-$(CONFIG_BITREV)	+= bitrev.o
 obj-$(CONFIG_QSORT)	+= qsort.o
+obj-$(CONFIG_BMP)	+= bmp.o
diff --git a/lib/bmp.c b/lib/bmp.c
new file mode 100644
index 0000000..776d3b3
--- /dev/null
+++ b/lib/bmp.c
@@ -0,0 +1,132 @@
+#include <common.h>
+#include <fs.h>
+#include <errno.h>
+#include <malloc.h>
+#include <fb.h>
+#include <bmp_layout.h>
+#include <asm/byteorder.h>
+
+static inline void set_pixel(struct fb_info *info, void *adr, int r, int g, int b)
+{
+	u32 px;
+
+	px = (r >> (8 - info->red.length)) << info->red.offset |
+		(g >> (8 - info->green.length)) << info->green.offset |
+		(b >> (8 - info->blue.length)) << info->blue.offset;
+
+	switch (info->bits_per_pixel) {
+	case 8:
+		break;
+	case 16:
+		*(u16 *)adr = px;
+		break;
+	case 32:
+		*(u32 *)adr = px;
+		break;
+	}
+}
+
+int bmp_render_file(struct fb_info *info, const char* bmpfile, void* fb,
+		    int startx, int starty, int xres, int yres, void* offscreenbuf)
+{
+	struct bmp_image *bmp;
+	int sw, sh, width, height;
+	int bits_per_pixel, fbsize;
+	int bmpsize;
+	int ret = 0;
+	void *adr, *buf;
+	char *image;
+
+	bmp = read_file(bmpfile, &bmpsize);
+	if (!bmp) {
+		printf("unable to read %s\n", bmpfile);
+		return -ENOMEM;
+	}
+
+	if (bmp->header.signature[0] != 'B' ||
+	      bmp->header.signature[1] != 'M') {
+		printf("No valid bmp file\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	sw = le32_to_cpu(bmp->header.width);
+	sh = le32_to_cpu(bmp->header.height);
+
+	if (startx < 0) {
+		startx = (xres - sw) / 2;
+		if (startx < 0)
+			startx = 0;
+	}
+
+	if (starty < 0) {
+		starty = (yres - sh) / 2;
+		if (starty < 0)
+			starty = 0;
+	}
+
+	width = min(sw, xres - startx);
+	height = min(sh, yres - starty);
+
+	bits_per_pixel = le16_to_cpu(bmp->header.bit_count);
+	fbsize = xres * yres * (info->bits_per_pixel >> 3);
+
+	buf = offscreenbuf ? offscreenbuf : fb;
+
+	if (bits_per_pixel == 8) {
+		int x, y;
+		struct bmp_color_table_entry *color_table = bmp->color_table;
+
+		for (y = 0; y < height; y++) {
+			image = (char *)bmp +
+					le32_to_cpu(bmp->header.data_offset);
+			image += (sh - y - 1) * sw * (bits_per_pixel >> 3);
+			adr = buf + ((y + starty) * xres + startx) *
+					(info->bits_per_pixel >> 3);
+			for (x = 0; x < width; x++) {
+				int pixel;
+
+				pixel = *image;
+
+				set_pixel(info, adr, color_table[pixel].red,
+						color_table[pixel].green,
+						color_table[pixel].blue);
+				adr += info->bits_per_pixel >> 3;
+
+				image += bits_per_pixel >> 3;
+			}
+		}
+	} else if (bits_per_pixel == 24) {
+		int x, y;
+
+		for (y = 0; y < height; y++) {
+			image = (char *)bmp +
+					le32_to_cpu(bmp->header.data_offset);
+			image += (sh - y - 1) * sw * (bits_per_pixel >> 3);
+			adr = buf + ((y + starty) * xres + startx) *
+					(info->bits_per_pixel >> 3);
+			for (x = 0; x < width; x++) {
+				char *pixel;
+
+				pixel = image;
+
+				set_pixel(info, adr, pixel[2], pixel[1],
+						pixel[0]);
+				adr += info->bits_per_pixel >> 3;
+
+				image += bits_per_pixel >> 3;
+			}
+		}
+	} else
+		printf("bmp: illegal bits per pixel value: %d\n", bits_per_pixel);
+
+	if (offscreenbuf)
+		memcpy(fb, offscreenbuf, fbsize);
+
+	free(bmp);
+	return sh;
+
+err:
+	free(bmp);
+	return ret;
+}
-- 
1.7.10.4


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[PATCH 03/11] introduce image_renderer framework

[Jean-Christophe PLAGNIOL-VILLARD]

This will allow to support bmp and png

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 include/image_renderer.h |  105 ++++++++++++++++++++++++++++++++++++++++++++++
 lib/Kconfig              |    5 +++
 lib/Makefile             |    1 +
 lib/image_renderer.c     |   96 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 207 insertions(+)
 create mode 100644 include/image_renderer.h
 create mode 100644 lib/image_renderer.c

diff --git a/include/image_renderer.h b/include/image_renderer.h
new file mode 100644
index 0000000..8604a2a
--- /dev/null
+++ b/include/image_renderer.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * GPL v2
+ */
+
+#ifndef __IMAGE_RENDER_H__
+#define __IMAGE_RENDER_H__
+
+#include <filetype.h>
+#include <linux/list.h>
+#include <errno.h>
+#include <linux/err.h>
+#include <fb.h>
+
+struct image {
+	void *data;
+	struct image_renderer *ir;
+	int height;
+	int width;
+	int bits_per_pixel;
+};
+
+struct image_renderer {
+	enum filetype type;
+	struct image *(*open)(char *data, int size);
+	void (*close)(struct image *img);
+	int (*renderer)(struct fb_info *info, struct image *img, void* fb,
+		int startx, int starty, void* offscreenbuf);
+
+	/*
+	 * do not free the data read from the file
+	 * needed by bmp support
+	 */
+	int keep_file_data;
+
+	struct list_head list;
+};
+
+static inline void set_pixel(struct fb_info *info, void *adr, int r, int g, int b)
+{
+	u32 px;
+
+	px = (r >> (8 - info->red.length)) << info->red.offset |
+		(g >> (8 - info->green.length)) << info->green.offset |
+		(b >> (8 - info->blue.length)) << info->blue.offset;
+
+	switch (info->bits_per_pixel) {
+	case 8:
+		break;
+	case 16:
+		*(u16 *)adr = px;
+		break;
+	case 32:
+		*(u32 *)adr = px;
+		break;
+	}
+}
+
+#ifdef CONFIG_IMAGE_RENDERER
+int image_renderer_register(struct image_renderer *ir);
+void image_render_unregister(struct image_renderer *ir);
+
+int image_renderer_image(struct fb_info *info, struct image *img, void* fb,
+	    int startx, int starty, void* offscreenbuf);
+
+struct image *image_renderer_open(const char* file);
+void image_renderer_close(struct image *img);
+
+#else
+static inline int image_renderer_register(struct image_renderer *ir)
+{
+	return -EINVAL;
+}
+static inline void image_renderer_unregister(struct image_renderer *ir) {}
+
+static inline struct image *image_renderer_open(const char* file)
+{
+	return ERR_PTR(-EINVAL);
+}
+
+static inline void image_renderer_close(struct image *img) {}
+
+int image_renderer_image(struct fb_info *info, struct image *img, void* fb,
+	    int startx, int starty, void* offscreenbuf);
+#endif
+
+static inline int image_renderer_file(struct fb_info *info, const char* file, void* fb,
+		    int startx, int starty, void* offscreenbuf)
+{
+	struct image* img = image_renderer_open(file);
+	int ret;
+
+	if (IS_ERR(img))
+		return PTR_ERR(img);
+
+	ret = image_renderer_image(info, img, fb, startx, starty,
+				offscreenbuf);
+
+	image_renderer_close(img);
+
+	return ret; 
+}
+
+#endif /* __IMAGE_RENDERER_H__ */
diff --git a/lib/Kconfig b/lib/Kconfig
index 93e360b..be3ea1c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -38,6 +38,11 @@ config BITREV
 config QSORT
 	bool
 
+config IMAGE_RENDERER
+	bool
+	depends on VIDEO
+	select FILETYPE
+
 config BMP
 	bool
 
diff --git a/lib/Makefile b/lib/Makefile
index df4b5e5..8fbae8a 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -35,3 +35,4 @@ obj-$(CONFIG_BCH)	+= bch.o
 obj-$(CONFIG_BITREV)	+= bitrev.o
 obj-$(CONFIG_QSORT)	+= qsort.o
 obj-$(CONFIG_BMP)	+= bmp.o
+obj-$(CONFIG_IMAGE_RENDERER)	+= image_renderer.o
diff --git a/lib/image_renderer.c b/lib/image_renderer.c
new file mode 100644
index 0000000..b08f6bf
--- /dev/null
+++ b/lib/image_renderer.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * GPL v2
+ */
+
+#include <common.h>
+#include <fb.h>
+#include <image_renderer.h>
+#include <errno.h>
+#include <fs.h>
+#include <malloc.h>
+
+static LIST_HEAD(image_renderers);
+
+static struct image_renderer *get_renderer(void* buf)
+{
+	struct image_renderer *ir;
+	enum filetype type = file_detect_type(buf);
+
+	list_for_each_entry(ir, &image_renderers, list) {
+		if (ir->type == type)
+			return ir;
+	}
+
+	return NULL;
+}
+
+struct image *image_renderer_open(const char* file)
+{
+	void *data;
+	int size;
+	struct image_renderer *ir;
+	struct image *img;
+	int ret;
+
+	data = read_file(file, &size);
+	if (!data) {
+		printf("unable to read %s\n", file);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	ir = get_renderer(data);
+	if (!ir) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	img = ir->open(data, size);
+	if (IS_ERR(img)) {
+		ret = PTR_ERR(img);
+		goto out;
+	}
+	img->ir = ir;
+	if (!ir->keep_file_data)
+		free(data);
+
+	return img;
+out:
+	free(data);
+	return ERR_PTR(ret);
+}
+
+void image_renderer_close(struct image *img)
+{
+	if (!img)
+		return;
+
+	img->ir->close(img);
+
+	free(img);
+}
+
+int image_renderer_image(struct fb_info *info, struct image *img, void* fb,
+	    int startx, int starty, void* offscreenbuf)
+{
+	return img->ir->renderer(info, img, fb, startx, starty, offscreenbuf);
+}
+
+int image_renderer_register(struct image_renderer *ir)
+{
+	if (!ir || !ir->type || !ir->renderer || !ir->open || !ir->close)
+		return -EIO;
+
+	list_add_tail(&ir->list, &image_renderers);
+
+	return 0;
+}
+
+void image_renderer_unregister(struct image_renderer *ir)
+{
+	if (!ir)
+		return;
+
+	list_del(&ir->list);
+}
-- 
1.7.10.4


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[PATCH 04/11] filetype: add BMP support

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 common/filetype.c  |    2 ++
 include/filetype.h |    1 +
 2 files changed, 3 insertions(+)

diff --git a/common/filetype.c b/common/filetype.c
index e736d43..5710394 100644
--- a/common/filetype.c
+++ b/common/filetype.c
@@ -101,6 +101,8 @@ enum filetype file_detect_type(void *_buf)
 		return filetype_mips_barebox;
 	if (is_fat(buf8))
 		return filetype_fat;
+	if (strncmp(buf8, "BM", 2) == 0)
+		return filetype_bmp;
 
 	return filetype_unknown;
 }
diff --git a/include/filetype.h b/include/filetype.h
index 179ec0f..6c97159 100644
--- a/include/filetype.h
+++ b/include/filetype.h
@@ -19,6 +19,7 @@ enum filetype {
 	filetype_sh,
 	filetype_mips_barebox,
 	filetype_fat,
+	filetype_bmp,
 };
 
 const char *file_type_to_string(enum filetype f);
-- 
1.7.10.4


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[PATCH 05/11] splash/bmp: switch to image_renderer

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 commands/Kconfig              |    1 +
 commands/splash.c             |   10 ++--
 lib/Kconfig                   |    1 +
 lib/bmp.c                     |  103 +++++++++++++++++++++--------------------
 {include => lib}/bmp_layout.h |    0
 5 files changed, 59 insertions(+), 56 deletions(-)
 rename {include => lib}/bmp_layout.h (100%)

diff --git a/commands/Kconfig b/commands/Kconfig
index 9107a3e..97993c1 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -538,6 +538,7 @@ config CMD_LSMOD
 config CMD_SPLASH
 	bool
 	depends on VIDEO
+	select IMAGE_RENDERER
 	select BMP
 	prompt "splash"
 	help
diff --git a/commands/splash.c b/commands/splash.c
index ad73778..88a6cf1 100644
--- a/commands/splash.c
+++ b/commands/splash.c
@@ -7,7 +7,7 @@
 #include <getopt.h>
 #include <fcntl.h>
 #include <fb.h>
-#include <bmp_layout.h>
+#include <image_renderer.h>
 
 static int do_splash(int argc, char *argv[])
 {
@@ -15,7 +15,7 @@ static int do_splash(int argc, char *argv[])
 	char *fbdev = "/dev/fb0";
 	void *fb;
 	struct fb_info info;
-	char *bmpfile;
+	char *image_file;
 	int startx = -1, starty = -1;
 	int xres, yres;
 	int offscreen = 0;
@@ -40,7 +40,7 @@ static int do_splash(int argc, char *argv[])
 		printf("no filename given\n");
 		return 1;
 	}
-	bmpfile = argv[optind];
+	image_file = argv[optind];
 
 	fd = open(fbdev, O_RDWR);
 	if (fd < 0) {
@@ -75,8 +75,8 @@ static int do_splash(int argc, char *argv[])
 			memcpy(offscreenbuf, fb, fbsize);
 	}
 
-	if (bmp_render_file(&info, bmpfile, fb, startx, starty, xres, yres,
-			    offscreenbuf) < 0)
+	if (image_renderer_file(&info, image_file, fb, startx, starty,
+				offscreenbuf) < 0)
 		ret = 1;
 
 	if (offscreenbuf)
diff --git a/lib/Kconfig b/lib/Kconfig
index be3ea1c..417c81e 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -45,5 +45,6 @@ config IMAGE_RENDERER
 
 config BMP
 	bool
+	depends on IMAGE_RENDERER
 
 endmenu
diff --git a/lib/bmp.c b/lib/bmp.c
index 776d3b3..8dd141b 100644
--- a/lib/bmp.c
+++ b/lib/bmp.c
@@ -1,74 +1,67 @@
 #include <common.h>
-#include <fs.h>
 #include <errno.h>
 #include <malloc.h>
 #include <fb.h>
-#include <bmp_layout.h>
+#include "bmp_layout.h"
 #include <asm/byteorder.h>
+#include <init.h>
+#include <image_renderer.h>
 
-static inline void set_pixel(struct fb_info *info, void *adr, int r, int g, int b)
+struct image *bmp_open(char *inbuf, int insize)
 {
-	u32 px;
-
-	px = (r >> (8 - info->red.length)) << info->red.offset |
-		(g >> (8 - info->green.length)) << info->green.offset |
-		(b >> (8 - info->blue.length)) << info->blue.offset;
-
-	switch (info->bits_per_pixel) {
-	case 8:
-		break;
-	case 16:
-		*(u16 *)adr = px;
-		break;
-	case 32:
-		*(u32 *)adr = px;
-		break;
+	struct image *img = calloc(1, sizeof(struct image));
+	struct bmp_image *bmp = (struct bmp_image*)inbuf;
+
+	if (!img) {
+		free(bmp);
+		return ERR_PTR(-ENOMEM);
 	}
+
+	img->data = inbuf;
+	img->height = le32_to_cpu(bmp->header.height);;
+	img->width = le32_to_cpu(bmp->header.width);;
+	img->bits_per_pixel = le16_to_cpu(bmp->header.bit_count);
+
+	pr_debug("bmp: %d x %d  x %d data@0x%p\n", img->width, img->height,
+		 img->bit_per_pixel, img->data);
+
+	return img;
+}
+
+void bmp_close(struct image *img)
+{
+	free(img->data);
 }
 
-int bmp_render_file(struct fb_info *info, const char* bmpfile, void* fb,
-		    int startx, int starty, int xres, int yres, void* offscreenbuf)
+static int bmp_renderer(struct fb_info *info, struct image *img, void* fb,
+		int startx, int starty, void* offscreenbuf)
 {
-	struct bmp_image *bmp;
-	int sw, sh, width, height;
+	struct bmp_image *bmp = img->data;
+	int width, height;
 	int bits_per_pixel, fbsize;
-	int bmpsize;
-	int ret = 0;
 	void *adr, *buf;
 	char *image;
+	int xres, yres;
 
-	bmp = read_file(bmpfile, &bmpsize);
-	if (!bmp) {
-		printf("unable to read %s\n", bmpfile);
-		return -ENOMEM;
-	}
-
-	if (bmp->header.signature[0] != 'B' ||
-	      bmp->header.signature[1] != 'M') {
-		printf("No valid bmp file\n");
-		ret = -EINVAL;
-		goto err;
-	}
-
-	sw = le32_to_cpu(bmp->header.width);
-	sh = le32_to_cpu(bmp->header.height);
+	xres = info->xres;
+	yres = info->yres;
 
 	if (startx < 0) {
-		startx = (xres - sw) / 2;
+		startx = (xres - img->width) / 2;
 		if (startx < 0)
 			startx = 0;
 	}
 
 	if (starty < 0) {
-		starty = (yres - sh) / 2;
+		starty = (yres - img->height) / 2;
 		if (starty < 0)
 			starty = 0;
 	}
 
-	width = min(sw, xres - startx);
-	height = min(sh, yres - starty);
+	width = min(img->width, xres - startx);
+	height = min(img->height, yres - starty);
 
-	bits_per_pixel = le16_to_cpu(bmp->header.bit_count);
+	bits_per_pixel = img->bits_per_pixel;
 	fbsize = xres * yres * (info->bits_per_pixel >> 3);
 
 	buf = offscreenbuf ? offscreenbuf : fb;
@@ -80,7 +73,7 @@ int bmp_render_file(struct fb_info *info, const char* bmpfile, void* fb,
 		for (y = 0; y < height; y++) {
 			image = (char *)bmp +
 					le32_to_cpu(bmp->header.data_offset);
-			image += (sh - y - 1) * sw * (bits_per_pixel >> 3);
+			image += (img->height - y - 1) * img->width * (bits_per_pixel >> 3);
 			adr = buf + ((y + starty) * xres + startx) *
 					(info->bits_per_pixel >> 3);
 			for (x = 0; x < width; x++) {
@@ -102,7 +95,7 @@ int bmp_render_file(struct fb_info *info, const char* bmpfile, void* fb,
 		for (y = 0; y < height; y++) {
 			image = (char *)bmp +
 					le32_to_cpu(bmp->header.data_offset);
-			image += (sh - y - 1) * sw * (bits_per_pixel >> 3);
+			image += (img->height - y - 1) * img->width * (bits_per_pixel >> 3);
 			adr = buf + ((y + starty) * xres + startx) *
 					(info->bits_per_pixel >> 3);
 			for (x = 0; x < width; x++) {
@@ -123,10 +116,18 @@ int bmp_render_file(struct fb_info *info, const char* bmpfile, void* fb,
 	if (offscreenbuf)
 		memcpy(fb, offscreenbuf, fbsize);
 
-	free(bmp);
-	return sh;
+	return img->height;
+}
+
+static struct image_renderer bmp = {
+	.type = filetype_bmp,
+	.open = bmp_open,
+	.close = bmp_close,
+	.renderer = bmp_renderer,
+};
 
-err:
-	free(bmp);
-	return ret;
+static int bmp_init(void)
+{
+	return image_renderer_register(&bmp);
 }
+fs_initcall(bmp_init);
diff --git a/include/bmp_layout.h b/lib/bmp_layout.h
similarity index 100%
rename from include/bmp_layout.h
rename to lib/bmp_layout.h
-- 
1.7.10.4


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[PATCH 06/11] splash: add support to set a background color

[Jean-Christophe PLAGNIOL-VILLARD]

This will allow to reset the screen to a default color when using transparent
PNG.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 commands/splash.c |   79 +++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 3 deletions(-)

diff --git a/commands/splash.c b/commands/splash.c
index 88a6cf1..4bddc6c 100644
--- a/commands/splash.c
+++ b/commands/splash.c
@@ -9,6 +9,66 @@
 #include <fb.h>
 #include <image_renderer.h>
 
+static u32 get_pixel(struct fb_info *info, u32 color)
+{
+	u32 px;
+	u8 t = (color >> 24) & 0xff;
+	u8 r = (color >> 16) & 0xff;
+	u8 g = (color >> 8 ) & 0xff;
+	u8 b = (color >> 0 ) & 0xff;
+
+	if (info->grayscale) {
+		 px = (r | g | b) ? 0xffffffff : 0x0;
+		 return px;
+	}
+
+	px = (t >> (8 - info->transp.length)) << info->transp.offset |
+		 (r >> (8 - info->red.length)) << info->red.offset |
+		 (g >> (8 - info->green.length)) << info->green.offset |
+		 (b >> (8 - info->blue.length)) << info->blue.offset;
+
+	return px;
+}
+
+static void memsetw(void *s, u16 c, size_t n)
+{
+	size_t i;
+	u16* tmp = s;
+
+	for (i = 0; i < n; i++)
+		*tmp++ = c;
+}
+
+static void memsetl(void *s, u32 c, size_t n)
+{
+	size_t i;
+	u32* tmp = s;
+
+	for (i = 0; i < n; i++)
+		*tmp++ = c;
+}
+
+static void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size)
+{
+	u32 px;
+	u8 *screen = buf;
+
+	px = get_pixel(info, color);
+
+	switch (info->bits_per_pixel) {
+	case 8:
+		memset(screen, (uint8_t)px, size);
+		break;
+	case 16:
+		memsetw(screen, (uint16_t)px, size);
+		break;
+	case 32:
+	case 24:
+		memsetl(screen, px, size);
+		break;
+	}
+}
+
 static int do_splash(int argc, char *argv[])
 {
 	int ret, opt, fd;
@@ -19,13 +79,19 @@ static int do_splash(int argc, char *argv[])
 	int startx = -1, starty = -1;
 	int xres, yres;
 	int offscreen = 0;
+	u32 bg_color = 0x00000000;
+	bool do_bg = false;
 	void *offscreenbuf = NULL;
 
-	while((opt = getopt(argc, argv, "f:x:y:o")) > 0) {
+	while((opt = getopt(argc, argv, "f:x:y:ob:")) > 0) {
 		switch(opt) {
 		case 'f':
 			fbdev = optarg;
 			break;
+		case 'b':
+			bg_color = simple_strtoul(optarg, NULL, 0);
+			do_bg = true;
+			break;
 		case 'x':
 			startx = simple_strtoul(optarg, NULL, 0);
 			break;
@@ -71,8 +137,14 @@ static int do_splash(int argc, char *argv[])
 
 		fbsize = xres * yres * (info.bits_per_pixel >> 3);
 		offscreenbuf = malloc(fbsize);
-		if (offscreenbuf)
-			memcpy(offscreenbuf, fb, fbsize);
+		if (offscreenbuf) {
+			if (do_bg)
+				memset_pixel(&info, offscreenbuf, bg_color, xres * yres);
+			else
+				memcpy(offscreenbuf, fb, fbsize);
+		}
+	} else if (do_bg) {
+		memset_pixel(&info, fb, bg_color, xres * yres);
 	}
 
 	if (image_renderer_file(&info, image_file, fb, startx, starty,
@@ -98,6 +170,7 @@ BAREBOX_CMD_HELP_SHORT("Show the bitmap FILE on the framebuffer.\n")
 BAREBOX_CMD_HELP_OPT  ("-f <fb>",   "framebuffer device (/dev/fb0)\n")
 BAREBOX_CMD_HELP_OPT  ("-x <xofs>", "x offset (default center)\n")
 BAREBOX_CMD_HELP_OPT  ("-y <yofs>", "y offset (default center)\n")
+BAREBOX_CMD_HELP_OPT  ("-b <backgroung>", "backgroung color\n")
 BAREBOX_CMD_HELP_OPT  ("-o",        "render offscreen\n")
 BAREBOX_CMD_HELP_END
 
-- 
1.7.10.4


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[PATCH 07/11] Introduce graphic utils

[Jean-Christophe PLAGNIOL-VILLARD]

to Factorise pixel rendering

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 commands/splash.c        |   61 +---------------------------------
 include/graphic_utils.h  |   13 ++++++++
 include/image_renderer.h |   20 -----------
 lib/Makefile             |    1 +
 lib/bmp.c                |    5 +--
 lib/graphic_utils.c      |   83 ++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 101 insertions(+), 82 deletions(-)
 create mode 100644 include/graphic_utils.h
 create mode 100644 lib/graphic_utils.c

diff --git a/commands/splash.c b/commands/splash.c
index 4bddc6c..f4b975b 100644
--- a/commands/splash.c
+++ b/commands/splash.c
@@ -8,66 +8,7 @@
 #include <fcntl.h>
 #include <fb.h>
 #include <image_renderer.h>
-
-static u32 get_pixel(struct fb_info *info, u32 color)
-{
-	u32 px;
-	u8 t = (color >> 24) & 0xff;
-	u8 r = (color >> 16) & 0xff;
-	u8 g = (color >> 8 ) & 0xff;
-	u8 b = (color >> 0 ) & 0xff;
-
-	if (info->grayscale) {
-		 px = (r | g | b) ? 0xffffffff : 0x0;
-		 return px;
-	}
-
-	px = (t >> (8 - info->transp.length)) << info->transp.offset |
-		 (r >> (8 - info->red.length)) << info->red.offset |
-		 (g >> (8 - info->green.length)) << info->green.offset |
-		 (b >> (8 - info->blue.length)) << info->blue.offset;
-
-	return px;
-}
-
-static void memsetw(void *s, u16 c, size_t n)
-{
-	size_t i;
-	u16* tmp = s;
-
-	for (i = 0; i < n; i++)
-		*tmp++ = c;
-}
-
-static void memsetl(void *s, u32 c, size_t n)
-{
-	size_t i;
-	u32* tmp = s;
-
-	for (i = 0; i < n; i++)
-		*tmp++ = c;
-}
-
-static void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size)
-{
-	u32 px;
-	u8 *screen = buf;
-
-	px = get_pixel(info, color);
-
-	switch (info->bits_per_pixel) {
-	case 8:
-		memset(screen, (uint8_t)px, size);
-		break;
-	case 16:
-		memsetw(screen, (uint16_t)px, size);
-		break;
-	case 32:
-	case 24:
-		memsetl(screen, px, size);
-		break;
-	}
-}
+#include <graphic_utils.h>
 
 static int do_splash(int argc, char *argv[])
 {
diff --git a/include/graphic_utils.h b/include/graphic_utils.h
new file mode 100644
index 0000000..6d555b2
--- /dev/null
+++ b/include/graphic_utils.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * GPL v2
+ */
+
+#ifndef __GRAPHIC_UTILS_H__
+#define __GRAPHIC_UTILS_H__
+
+void set_rgb_pixel(struct fb_info *info, void *adr, int r, int g, int b);
+void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size);
+
+#endif /* __GRAPHIC_UTILS_H__ */
diff --git a/include/image_renderer.h b/include/image_renderer.h
index 8604a2a..31ef1c6 100644
--- a/include/image_renderer.h
+++ b/include/image_renderer.h
@@ -37,26 +37,6 @@ struct image_renderer {
 	struct list_head list;
 };
 
-static inline void set_pixel(struct fb_info *info, void *adr, int r, int g, int b)
-{
-	u32 px;
-
-	px = (r >> (8 - info->red.length)) << info->red.offset |
-		(g >> (8 - info->green.length)) << info->green.offset |
-		(b >> (8 - info->blue.length)) << info->blue.offset;
-
-	switch (info->bits_per_pixel) {
-	case 8:
-		break;
-	case 16:
-		*(u16 *)adr = px;
-		break;
-	case 32:
-		*(u32 *)adr = px;
-		break;
-	}
-}
-
 #ifdef CONFIG_IMAGE_RENDERER
 int image_renderer_register(struct image_renderer *ir);
 void image_render_unregister(struct image_renderer *ir);
diff --git a/lib/Makefile b/lib/Makefile
index 8fbae8a..96b7c56 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -35,4 +35,5 @@ obj-$(CONFIG_BCH)	+= bch.o
 obj-$(CONFIG_BITREV)	+= bitrev.o
 obj-$(CONFIG_QSORT)	+= qsort.o
 obj-$(CONFIG_BMP)	+= bmp.o
+obj-$(CONFIG_IMAGE_RENDERER)	+= image_renderer.o graphic_utils.o
 obj-$(CONFIG_IMAGE_RENDERER)	+= image_renderer.o
diff --git a/lib/bmp.c b/lib/bmp.c
index 8dd141b..fec9975 100644
--- a/lib/bmp.c
+++ b/lib/bmp.c
@@ -6,6 +6,7 @@
 #include <asm/byteorder.h>
 #include <init.h>
 #include <image_renderer.h>
+#include <graphic_utils.h>
 
 struct image *bmp_open(char *inbuf, int insize)
 {
@@ -81,7 +82,7 @@ static int bmp_renderer(struct fb_info *info, struct image *img, void* fb,
 
 				pixel = *image;
 
-				set_pixel(info, adr, color_table[pixel].red,
+				set_rgb_pixel(info, adr, color_table[pixel].red,
 						color_table[pixel].green,
 						color_table[pixel].blue);
 				adr += info->bits_per_pixel >> 3;
@@ -103,7 +104,7 @@ static int bmp_renderer(struct fb_info *info, struct image *img, void* fb,
 
 				pixel = image;
 
-				set_pixel(info, adr, pixel[2], pixel[1],
+				set_rgb_pixel(info, adr, pixel[2], pixel[1],
 						pixel[0]);
 				adr += info->bits_per_pixel >> 3;
 
diff --git a/lib/graphic_utils.c b/lib/graphic_utils.c
new file mode 100644
index 0000000..2e174d8
--- /dev/null
+++ b/lib/graphic_utils.c
@@ -0,0 +1,83 @@
+#include <common.h>
+#include <fb.h>
+#include <graphic_utils.h>
+
+static u32 get_pixel(struct fb_info *info, u32 color)
+{
+	u32 px;
+	u8 t = (color >> 24) & 0xff;
+	u8 r = (color >> 16) & 0xff;
+	u8 g = (color >> 8 ) & 0xff;
+	u8 b = (color >> 0 ) & 0xff;
+
+	if (info->grayscale) {
+		 px = (r | g | b) ? 0xffffffff : 0x0;
+		 return px;
+	}
+
+	px = (t >> (8 - info->transp.length)) << info->transp.offset |
+		 (r >> (8 - info->red.length)) << info->red.offset |
+		 (g >> (8 - info->green.length)) << info->green.offset |
+		 (b >> (8 - info->blue.length)) << info->blue.offset;
+
+	return px;
+}
+
+static void memsetw(void *s, u16 c, size_t n)
+{
+	size_t i;
+	u16* tmp = s;
+
+	for (i = 0; i < n; i++)
+		*tmp++ = c;
+}
+
+static void memsetl(void *s, u32 c, size_t n)
+{
+	size_t i;
+	u32* tmp = s;
+
+	for (i = 0; i < n; i++)
+		*tmp++ = c;
+}
+
+void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size)
+{
+	u32 px;
+	u8 *screen = buf;
+
+	px = get_pixel(info, color);
+
+	switch (info->bits_per_pixel) {
+	case 8:
+		memset(screen, (uint8_t)px, size);
+		break;
+	case 16:
+		memsetw(screen, (uint16_t)px, size);
+		break;
+	case 32:
+	case 24:
+		memsetl(screen, px, size);
+		break;
+	}
+}
+
+void set_rgb_pixel(struct fb_info *info, void *adr, int r, int g, int b)
+{
+	u32 px;
+
+	px = (r >> (8 - info->red.length)) << info->red.offset |
+		(g >> (8 - info->green.length)) << info->green.offset |
+		(b >> (8 - info->blue.length)) << info->blue.offset;
+
+	switch (info->bits_per_pixel) {
+	case 8:
+		break;
+	case 16:
+		*(u16 *)adr = px;
+		break;
+	case 32:
+		*(u32 *)adr = px;
+		break;
+	}
+}
-- 
1.7.10.4


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[PATCH 08/11] graphic_utils: add rgba support

[Jean-Christophe PLAGNIOL-VILLARD]

this will allow to render rgba image with or without hw support

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 include/graphic_utils.h |    4 ++
 lib/graphic_utils.c     |  116 +++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 116 insertions(+), 4 deletions(-)

diff --git a/include/graphic_utils.h b/include/graphic_utils.h
index 6d555b2..7cb0b2f 100644
--- a/include/graphic_utils.h
+++ b/include/graphic_utils.h
@@ -7,7 +7,11 @@
 #ifndef __GRAPHIC_UTILS_H__
 #define __GRAPHIC_UTILS_H__
 
+void rgba_blend(struct fb_info *info, void *image, void* dest, int height,
+	int width, int startx, int starty, bool is_rgba);
+void set_pixel(struct fb_info *info, void *adr, u32 px);
 void set_rgb_pixel(struct fb_info *info, void *adr, int r, int g, int b);
+void set_rgba_pixel(struct fb_info *info, void *adr, int r, int g, int b, int a);
 void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size);
 
 #endif /* __GRAPHIC_UTILS_H__ */
diff --git a/lib/graphic_utils.c b/lib/graphic_utils.c
index 2e174d8..4d627b2 100644
--- a/lib/graphic_utils.c
+++ b/lib/graphic_utils.c
@@ -62,14 +62,39 @@ void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size)
 	}
 }
 
-void set_rgb_pixel(struct fb_info *info, void *adr, int r, int g, int b)
+static void get_rgb_pixel(struct fb_info *info, void *adr, int *r ,int *g, int *b)
 {
 	u32 px;
+	u32 rmask, gmask, bmask;
 
-	px = (r >> (8 - info->red.length)) << info->red.offset |
-		(g >> (8 - info->green.length)) << info->green.offset |
-		(b >> (8 - info->blue.length)) << info->blue.offset;
+	switch (info->bits_per_pixel) {
+	case 16:
+		px = *(u16 *)adr;
+		break;
+	case 32:
+		px = *(u32 *)adr;
+		break;
+	case 8:
+	default:
+		return;
+	}
+
+	rmask = (0xff >> (8 - info->blue.length)) << info->blue.offset |
+		(0xff >> (8 - info->green.length)) << info->green.offset;
+
+	gmask = (0xff >> (8 - info->red.length)) << info->red.offset |
+		(0xff >> (8 - info->blue.length)) << info->blue.offset;
+
+	bmask = (0xff >> (8 - info->red.length)) << info->red.offset |
+		(0xff >> (8 - info->green.length)) << info->green.offset;
 
+	*r = ((px & ~rmask) >> info->red.offset) << (8 - info->red.length);
+	*g = ((px & ~gmask) >> info->green.offset) << (8 - info->green.length);
+	*b = ((px & ~bmask) >> info->blue.offset) << (8 - info->blue.length);
+}
+
+void set_pixel(struct fb_info *info, void *adr, u32 px)
+{
 	switch (info->bits_per_pixel) {
 	case 8:
 		break;
@@ -81,3 +106,86 @@ void set_rgb_pixel(struct fb_info *info, void *adr, int r, int g, int b)
 		break;
 	}
 }
+
+void set_rgb_pixel(struct fb_info *info, void *adr, int r, int g, int b)
+{
+	u32 px;
+
+	px = (r >> (8 - info->red.length)) << info->red.offset |
+		(g >> (8 - info->green.length)) << info->green.offset |
+		(b >> (8 - info->blue.length)) << info->blue.offset;
+
+	set_pixel(info, adr, px);
+}
+
+static int alpha_mux(int s, int d, int a)
+{
+	return (d * a + s * (255 - a)) >> 8;
+}
+
+void set_rgba_pixel(struct fb_info *info, void *adr, int r, int g, int b, int a)
+{
+	u32 px = 0x0;
+
+	if (!a)
+		return;
+
+	if (a != 0xff) {
+		if (info->transp.length) {
+			px |= (a >> (8 - info->transp.length)) << info->transp.offset;
+		} else {
+			int sr = 0;
+			int sg = 0;
+			int sb = 0;
+
+			get_rgb_pixel(info, adr, &sr, &sg, &sb);
+
+			r = alpha_mux(sr, r, a);
+			g = alpha_mux(sg, g, a);
+			b = alpha_mux(sb, b, a);
+
+			set_rgb_pixel(info, adr, r, g, b);
+
+			return;
+		}
+	}
+
+	px |= (r >> (8 - info->red.length)) << info->red.offset |
+		(g >> (8 - info->green.length)) << info->green.offset |
+		(b >> (8 - info->blue.length)) << info->blue.offset;
+
+	set_pixel(info, adr, px);
+}
+
+void rgba_blend(struct fb_info *info, void *image, void* buf, int height,
+	int width, int startx, int starty, bool is_rgba)
+{
+	unsigned char *adr;
+	int x, y;
+	int xres;
+	int img_byte_per_pixel = 3;
+
+	if (is_rgba)
+		img_byte_per_pixel++;
+
+	xres = info->xres;
+
+	for (y = 0; y < height; y++) {
+		adr = buf + ((y + starty) * xres + startx) *
+				(info->bits_per_pixel >> 3);
+
+		for (x = 0; x < width; x++) {
+			char *pixel;
+
+			pixel = image;
+			if (is_rgba)
+				set_rgba_pixel(info, adr, pixel[0], pixel[1],
+						pixel[2], pixel[3]);
+			else
+				set_rgb_pixel(info, adr, pixel[0], pixel[1],
+						pixel[2]);
+			adr += info->bits_per_pixel >> 3;
+			image += img_byte_per_pixel;
+		}
+	}
+}
-- 
1.7.10.4


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[PATCH 09/11] filetype: add PNG support

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 common/filetype.c  |    3 +++
 include/filetype.h |    1 +
 2 files changed, 4 insertions(+)

diff --git a/common/filetype.c b/common/filetype.c
index 5710394..0eaf119 100644
--- a/common/filetype.c
+++ b/common/filetype.c
@@ -71,6 +71,7 @@ static int is_fat(u8 *buf)
 enum filetype file_detect_type(void *_buf)
 {
 	u32 *buf = _buf;
+	u64 *buf64 = _buf;
 	u8 *buf8 = _buf;
 
 	if (strncmp(buf8, "#!/bin/sh", 9) == 0)
@@ -103,6 +104,8 @@ enum filetype file_detect_type(void *_buf)
 		return filetype_fat;
 	if (strncmp(buf8, "BM", 2) == 0)
 		return filetype_bmp;
+	if (buf64[0] == le64_to_cpu(0x0a1a0a0d474e5089ull))
+		return filetype_png;
 
 	return filetype_unknown;
 }
diff --git a/include/filetype.h b/include/filetype.h
index 6c97159..2924032 100644
--- a/include/filetype.h
+++ b/include/filetype.h
@@ -20,6 +20,7 @@ enum filetype {
 	filetype_mips_barebox,
 	filetype_fat,
 	filetype_bmp,
+	filetype_png,
 };
 
 const char *file_type_to_string(enum filetype f);
-- 
1.7.10.4


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[PATCH 10/11] add PNG support

[Jean-Christophe PLAGNIOL-VILLARD]

use LodePNG version 20120729 from http://lodev.org/lodepng/

The original coding style is keeped to simplify update.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 commands/Kconfig |    1 -
 lib/Kconfig      |   25 +-
 lib/Makefile     |    2 +
 lib/lodepng.c    | 5928 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/lodepng.h    | 1640 +++++++++++++++
 lib/png.c        |   89 +
 lib/png.h        |   21 +
 lib/png_lode.c   |   90 +
 8 files changed, 7793 insertions(+), 3 deletions(-)
 create mode 100644 lib/lodepng.c
 create mode 100644 lib/lodepng.h
 create mode 100644 lib/png.c
 create mode 100644 lib/png.h
 create mode 100644 lib/png_lode.c

diff --git a/commands/Kconfig b/commands/Kconfig
index 97993c1..10c4a03 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -539,7 +539,6 @@ config CMD_SPLASH
 	bool
 	depends on VIDEO
 	select IMAGE_RENDERER
-	select BMP
 	prompt "splash"
 	help
 	  show bmp files on framebuffer devices
diff --git a/lib/Kconfig b/lib/Kconfig
index 417c81e..2405d59 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -43,8 +43,29 @@ config IMAGE_RENDERER
 	depends on VIDEO
 	select FILETYPE
 
+if IMAGE_RENDERER
+
 config BMP
-	bool
-	depends on IMAGE_RENDERER
+	bool "bmp"
+
+config PNG
+	bool "png"
+	select ZLIB
+
+if PNG
+
+choice
+	prompt "PNG Lib"
+
+config LODEPNG
+	bool "lodePNG"
+	help
+	  Mostly PNG support
+
+endchoice
+
+endif
+
+endif
 
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index 96b7c56..d752343 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -37,3 +37,5 @@ obj-$(CONFIG_QSORT)	+= qsort.o
 obj-$(CONFIG_BMP)	+= bmp.o
 obj-$(CONFIG_IMAGE_RENDERER)	+= image_renderer.o graphic_utils.o
 obj-$(CONFIG_IMAGE_RENDERER)	+= image_renderer.o
+obj-$(CONFIG_PNG)	+= png.o
+obj-$(CONFIG_LODEPNG)	+= png_lode.o lodepng.o
diff --git a/lib/lodepng.c b/lib/lodepng.c
new file mode 100644
index 0000000..ba21cd2
--- /dev/null
+++ b/lib/lodepng.c
@@ -0,0 +1,5928 @@
+/*
+LodePNG version 20120729
+
+Copyright (c) 2005-2012 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+/*
+The manual and changelog are in the header file "lodepng.h"
+Rename this file to lodepng.cpp to use it for C++, or to lodepng.c to use it for C.
+*/
+
+#include "lodepng.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef __BAREBOX__
+#include <common.h>
+#include <malloc.h>
+#include <fs.h>
+#include <fcntl.h>
+#endif
+
+#ifdef LODEPNG_COMPILE_CPP
+#include <fstream>
+#endif /*LODEPNG_COMPILE_CPP*/
+
+#define VERSION_STRING "20120729"
+
+/*
+This source file is built up in the following large parts. The code sections
+with the "LODEPNG_COMPILE_" #defines divide this up further in an intermixed way.
+-Tools for C and common code for PNG and Zlib
+-C Code for Zlib (huffman, deflate, ...)
+-C Code for PNG (file format chunks, adam7, PNG filters, color conversions, ...)
+-The C++ wrapper around all of the above
+*/
+
+/*The malloc, realloc and free functions defined here with "my" in front of the
+name, so that you can easily change them to others related to your platform in
+this one location if needed. Everything else in the code calls these.*/
+
+static void* mymalloc(size_t size)
+{
+  return malloc(size);
+}
+
+static void* myrealloc(void* ptr, size_t new_size)
+{
+  return realloc(ptr, new_size);
+}
+
+static void myfree(void* ptr)
+{
+  free(ptr);
+}
+
+/*
+Declaration of the custom functions used if LODEPNG_COMPILE_ZLIB isn't defined
+or LODEPNG_CUSTOM_ZLIB_DECODER or LODEPNG_CUSTOM_ZLIB_ENCODER are enabled.
+
+In that case, you need to define these yourself (which you can do in one of your
+own source files) so that LodePNG can link to it.
+
+By default, this is not needed. If LODEPNG_COMPILE_ZLIB isn't defined, then only
+the two zlib related ones are needed.
+
+If needed, the functions must act as follows:
+*out must be NULL and *outsize must be 0 initially, and after the function is done,
+*out must point to the decompressed data, *outsize must be the size of it, and must
+be the size of the useful data in bytes, not the alloc size.
+*/
+unsigned lodepng_custom_zlib_decompress(unsigned char** out, size_t* outsize,
+                                        const unsigned char* in, size_t insize,
+                                        const LodePNGDecompressSettings* settings);
+unsigned lodepng_custom_zlib_compress(unsigned char** out, size_t* outsize,
+                                      const unsigned char* in, size_t insize,
+                                      const LodePNGCompressSettings* settings);
+unsigned lodepng_custom_inflate(unsigned char** out, size_t* outsize,
+                                const unsigned char* in, size_t insize,
+                                const LodePNGDecompressSettings* settings);
+unsigned lodepng_custom_deflate(unsigned char** out, size_t* outsize,
+                                const unsigned char* in, size_t insize,
+                                const LodePNGCompressSettings* settings);
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* // Tools for C, and common code for PNG and Zlib.                       // */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+Often in case of an error a value is assigned to a variable and then it breaks
+out of a loop (to go to the cleanup phase of a function). This macro does that.
+It makes the error handling code shorter and more readable.
+
+Example: if(!uivector_resizev(&frequencies_ll, 286, 0)) ERROR_BREAK(83);
+*/
+#define CERROR_BREAK(errorvar, code)\
+{\
+  errorvar = code;\
+  break;\
+}
+
+/*version of CERROR_BREAK that assumes the common case where the error variable is named "error"*/
+#define ERROR_BREAK(code) CERROR_BREAK(error, code)
+
+/*Set error var to the error code, and return it.*/
+#define CERROR_RETURN_ERROR(errorvar, code)\
+{\
+  errorvar = code;\
+  return code;\
+}
+
+/*Try the code, if it returns error, also return the error.*/
+#define CERROR_TRY_RETURN(call)\
+{\
+  unsigned error = call;\
+  if(error) return error;\
+}
+
+/*
+About uivector, ucvector and string:
+-All of them wrap dynamic arrays or text strings in a similar way.
+-LodePNG was originally written in C++. The vectors replace the std::vectors that were used in the C++ version.
+-The string tools are made to avoid problems with compilers that declare things like strncat as deprecated.
+-They're not used in the interface, only internally in this file as static functions.
+-As with many other structs in this file, the init and cleanup functions serve as ctor and dtor.
+*/
+
+#ifdef LODEPNG_COMPILE_ZLIB
+/*dynamic vector of unsigned ints*/
+typedef struct uivector
+{
+  unsigned* data;
+  size_t size; /*size in number of unsigned longs*/
+  size_t allocsize; /*allocated size in bytes*/
+} uivector;
+
+static void uivector_cleanup(void* p)
+{
+  ((uivector*)p)->size = ((uivector*)p)->allocsize = 0;
+  myfree(((uivector*)p)->data);
+  ((uivector*)p)->data = NULL;
+}
+
+/*returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned uivector_resize(uivector* p, size_t size)
+{
+  if(size * sizeof(unsigned) > p->allocsize)
+  {
+    size_t newsize = size * sizeof(unsigned) * 2;
+    void* data = myrealloc(p->data, newsize);
+    if(data)
+    {
+      p->allocsize = newsize;
+      p->data = (unsigned*)data;
+      p->size = size;
+    }
+    else return 0;
+  }
+  else p->size = size;
+  return 1;
+}
+
+/*resize and give all new elements the value*/
+static unsigned uivector_resizev(uivector* p, size_t size, unsigned value)
+{
+  size_t oldsize = p->size, i;
+  if(!uivector_resize(p, size)) return 0;
+  for(i = oldsize; i < size; i++) p->data[i] = value;
+  return 1;
+}
+
+static void uivector_init(uivector* p)
+{
+  p->data = NULL;
+  p->size = p->allocsize = 0;
+}
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned uivector_push_back(uivector* p, unsigned c)
+{
+  if(!uivector_resize(p, p->size + 1)) return 0;
+  p->data[p->size - 1] = c;
+  return 1;
+}
+
+/*copy q to p, returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned uivector_copy(uivector* p, const uivector* q)
+{
+  size_t i;
+  if(!uivector_resize(p, q->size)) return 0;
+  for(i = 0; i < q->size; i++) p->data[i] = q->data[i];
+  return 1;
+}
+
+static void uivector_swap(uivector* p, uivector* q)
+{
+  size_t tmp;
+  unsigned* tmpp;
+  tmp = p->size; p->size = q->size; q->size = tmp;
+  tmp = p->allocsize; p->allocsize = q->allocsize; q->allocsize = tmp;
+  tmpp = p->data; p->data = q->data; q->data = tmpp;
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+#endif /*LODEPNG_COMPILE_ZLIB*/
+
+/* /////////////////////////////////////////////////////////////////////////// */
+
+/*dynamic vector of unsigned chars*/
+typedef struct ucvector
+{
+  unsigned char* data;
+  size_t size; /*used size*/
+  size_t allocsize; /*allocated size*/
+} ucvector;
+
+static void ucvector_cleanup(void* p)
+{
+  ((ucvector*)p)->size = ((ucvector*)p)->allocsize = 0;
+  myfree(((ucvector*)p)->data);
+  ((ucvector*)p)->data = NULL;
+}
+
+/*returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned ucvector_resize(ucvector* p, size_t size)
+{
+  if(size * sizeof(unsigned char) > p->allocsize)
+  {
+    size_t newsize = size * sizeof(unsigned char) * 2;
+    void* data = myrealloc(p->data, newsize);
+    if(data)
+    {
+      p->allocsize = newsize;
+      p->data = (unsigned char*)data;
+      p->size = size;
+    }
+    else return 0; /*error: not enough memory*/
+  }
+  else p->size = size;
+  return 1;
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+#ifdef LODEPNG_COMPILE_PNG
+/*resize and give all new elements the value*/
+static unsigned ucvector_resizev(ucvector* p, size_t size, unsigned char value)
+{
+  size_t oldsize = p->size, i;
+  if(!ucvector_resize(p, size)) return 0;
+  for(i = oldsize; i < size; i++) p->data[i] = value;
+  return 1;
+}
+#endif /*LODEPNG_COMPILE_PNG*/
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+static void ucvector_init(ucvector* p)
+{
+  p->data = NULL;
+  p->size = p->allocsize = 0;
+}
+
+#ifdef LODEPNG_COMPILE_ZLIB
+/*you can both convert from vector to buffer&size and vica versa. If you use
+init_buffer to take over a buffer and size, it is not needed to use cleanup*/
+static void ucvector_init_buffer(ucvector* p, unsigned char* buffer, size_t size)
+{
+  p->data = buffer;
+  p->allocsize = p->size = size;
+}
+#endif /*LODEPNG_COMPILE_ZLIB*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned ucvector_push_back(ucvector* p, unsigned char c)
+{
+  if(!ucvector_resize(p, p->size + 1)) return 0;
+  p->data[p->size - 1] = c;
+  return 1;
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_PNG
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+/*returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned string_resize(char** out, size_t size)
+{
+  char* data = (char*)myrealloc(*out, size + 1);
+  if(data)
+  {
+    data[size] = 0; /*null termination char*/
+    *out = data;
+  }
+  return data != 0;
+}
+
+/*init a {char*, size_t} pair for use as string*/
+static void string_init(char** out)
+{
+  *out = NULL;
+  string_resize(out, 0);
+}
+
+/*free the above pair again*/
+static void string_cleanup(char** out)
+{
+  myfree(*out);
+  *out = NULL;
+}
+
+static void string_set(char** out, const char* in)
+{
+  size_t insize = strlen(in), i = 0;
+  if(string_resize(out, insize))
+  {
+    for(i = 0; i < insize; i++)
+    {
+      (*out)[i] = in[i];
+    }
+  }
+}
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+unsigned lodepng_read32bitInt(const unsigned char* buffer)
+{
+  return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3];
+}
+
+/*buffer must have at least 4 allocated bytes available*/
+static void lodepng_set32bitInt(unsigned char* buffer, unsigned value)
+{
+  buffer[0] = (unsigned char)((value >> 24) & 0xff);
+  buffer[1] = (unsigned char)((value >> 16) & 0xff);
+  buffer[2] = (unsigned char)((value >>  8) & 0xff);
+  buffer[3] = (unsigned char)((value      ) & 0xff);
+}
+
+#ifdef LODEPNG_COMPILE_ENCODER
+static void lodepng_add32bitInt(ucvector* buffer, unsigned value)
+{
+  ucvector_resize(buffer, buffer->size + 4); /*todo: give error if resize failed*/
+  lodepng_set32bitInt(&buffer->data[buffer->size - 4], value);
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / File IO                                                                / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_DISK
+
+unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename)
+{
+  FILE* file;
+  long size;
+
+  /*provide some proper output values if error will happen*/
+  *out = 0;
+  *outsize = 0;
+
+  file = fopen(filename, "rb");
+  if(!file) return 78;
+
+  /*get filesize:*/
+  fseek(file , 0 , SEEK_END);
+  size = ftell(file);
+  rewind(file);
+
+  /*read contents of the file into the vector*/
+  *outsize = 0;
+  *out = (unsigned char*)mymalloc((size_t)size);
+  if(size && (*out)) (*outsize) = fread(*out, 1, (size_t)size, file);
+
+  fclose(file);
+  if(!(*out) && size) return 83; /*the above malloc failed*/
+  return 0;
+}
+
+/*write given buffer to the file, overwriting the file, it doesn't append to it.*/
+unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename)
+{
+  FILE* file;
+  file = fopen(filename, "wb" );
+  if(!file) return 79;
+  fwrite((char*)buffer , 1 , buffersize, file);
+  fclose(file);
+  return 0;
+}
+
+#endif /*LODEPNG_COMPILE_DISK*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* // End of common code and tools. Begin of Zlib related code.            // */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_ZLIB
+#ifdef LODEPNG_COMPILE_ENCODER
+/*TODO: this ignores potential out of memory errors*/
+static void addBitToStream(size_t* bitpointer, ucvector* bitstream, unsigned char bit)
+{
+  /*add a new byte at the end*/
+  if((*bitpointer) % 8 == 0) ucvector_push_back(bitstream, (unsigned char)0);
+  /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/
+  (bitstream->data[bitstream->size - 1]) |= (bit << ((*bitpointer) & 0x7));
+  (*bitpointer)++;
+}
+
+static void addBitsToStream(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits)
+{
+  size_t i;
+  for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> i) & 1));
+}
+
+static void addBitsToStreamReversed(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits)
+{
+  size_t i;
+  for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> (nbits - 1 - i)) & 1));
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+#define READBIT(bitpointer, bitstream) ((bitstream[bitpointer >> 3] >> (bitpointer & 0x7)) & (unsigned char)1)
+
+static unsigned char readBitFromStream(size_t* bitpointer, const unsigned char* bitstream)
+{
+  unsigned char result = (unsigned char)(READBIT(*bitpointer, bitstream));
+  (*bitpointer)++;
+  return result;
+}
+
+static unsigned readBitsFromStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits)
+{
+  unsigned result = 0, i;
+  for(i = 0; i < nbits; i++)
+  {
+    result += ((unsigned)READBIT(*bitpointer, bitstream)) << i;
+    (*bitpointer)++;
+  }
+  return result;
+}
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Deflate - Huffman                                                      / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#define FIRST_LENGTH_CODE_INDEX 257
+#define LAST_LENGTH_CODE_INDEX 285
+/*256 literals, the end code, some length codes, and 2 unused codes*/
+#define NUM_DEFLATE_CODE_SYMBOLS 288
+/*the distance codes have their own symbols, 30 used, 2 unused*/
+#define NUM_DISTANCE_SYMBOLS 32
+/*the code length codes. 0-15: code lengths, 16: copy previous 3-6 times, 17: 3-10 zeros, 18: 11-138 zeros*/
+#define NUM_CODE_LENGTH_CODES 19
+
+/*the base lengths represented by codes 257-285*/
+static const unsigned LENGTHBASE[29]
+  = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59,
+     67, 83, 99, 115, 131, 163, 195, 227, 258};
+
+/*the extra bits used by codes 257-285 (added to base length)*/
+static const unsigned LENGTHEXTRA[29]
+  = {0, 0, 0, 0, 0, 0, 0,  0,  1,  1,  1,  1,  2,  2,  2,  2,  3,  3,  3,  3,
+      4,  4,  4,   4,   5,   5,   5,   5,   0};
+
+/*the base backwards distances (the bits of distance codes appear after length codes and use their own huffman tree)*/
+static const unsigned DISTANCEBASE[30]
+  = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513,
+     769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
+
+/*the extra bits of backwards distances (added to base)*/
+static const unsigned DISTANCEEXTRA[30]
+  = {0, 0, 0, 0, 1, 1, 2,  2,  3,  3,  4,  4,  5,  5,   6,   6,   7,   7,   8,
+       8,    9,    9,   10,   10,   11,   11,   12,    12,    13,    13};
+
+/*the order in which "code length alphabet code lengths" are stored, out of this
+the huffman tree of the dynamic huffman tree lengths is generated*/
+static const unsigned CLCL_ORDER[NUM_CODE_LENGTH_CODES]
+  = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+Huffman tree struct, containing multiple representations of the tree
+*/
+typedef struct HuffmanTree
+{
+  unsigned* tree2d;
+  unsigned* tree1d;
+  unsigned* lengths; /*the lengths of the codes of the 1d-tree*/
+  unsigned maxbitlen; /*maximum number of bits a single code can get*/
+  unsigned numcodes; /*number of symbols in the alphabet = number of codes*/
+} HuffmanTree;
+
+/*function used for debug purposes to draw the tree in ascii art with C++*/
+/*#include <iostream>
+static void HuffmanTree_draw(HuffmanTree* tree)
+{
+  std::cout << "tree. length: " << tree->numcodes << " maxbitlen: " << tree->maxbitlen << std::endl;
+  for(size_t i = 0; i < tree->tree1d.size; i++)
+  {
+    if(tree->lengths.data[i])
+      std::cout << i << " " << tree->tree1d.data[i] << " " << tree->lengths.data[i] << std::endl;
+  }
+  std::cout << std::endl;
+}*/
+
+static void HuffmanTree_init(HuffmanTree* tree)
+{
+  tree->tree2d = 0;
+  tree->tree1d = 0;
+  tree->lengths = 0;
+}
+
+static void HuffmanTree_cleanup(HuffmanTree* tree)
+{
+  myfree(tree->tree2d);
+  myfree(tree->tree1d);
+  myfree(tree->lengths);
+}
+
+/*the tree representation used by the decoder. return value is error*/
+static unsigned HuffmanTree_make2DTree(HuffmanTree* tree)
+{
+  unsigned nodefilled = 0; /*up to which node it is filled*/
+  unsigned treepos = 0; /*position in the tree (1 of the numcodes columns)*/
+  unsigned n, i;
+
+  tree->tree2d = (unsigned*)mymalloc(tree->numcodes * 2 * sizeof(unsigned));
+  if(!tree->tree2d) return 83; /*alloc fail*/
+
+  /*
+  convert tree1d[] to tree2d[][]. In the 2D array, a value of 32767 means
+  uninited, a value >= numcodes is an address to another bit, a value < numcodes
+  is a code. The 2 rows are the 2 possible bit values (0 or 1), there are as
+  many columns as codes - 1.
+  A good huffmann tree has N * 2 - 1 nodes, of which N - 1 are internal nodes.
+  Here, the internal nodes are stored (what their 0 and 1 option point to).
+  There is only memory for such good tree currently, if there are more nodes
+  (due to too long length codes), error 55 will happen
+  */
+  for(n = 0; n < tree->numcodes * 2; n++)
+  {
+    tree->tree2d[n] = 32767; /*32767 here means the tree2d isn't filled there yet*/
+  }
+
+  for(n = 0; n < tree->numcodes; n++) /*the codes*/
+  {
+    for(i = 0; i < tree->lengths[n]; i++) /*the bits for this code*/
+    {
+      unsigned char bit = (unsigned char)((tree->tree1d[n] >> (tree->lengths[n] - i - 1)) & 1);
+      if(treepos > tree->numcodes - 2) return 55; /*oversubscribed, see comment in lodepng_error_text*/
+      if(tree->tree2d[2 * treepos + bit] == 32767) /*not yet filled in*/
+      {
+        if(i + 1 == tree->lengths[n]) /*last bit*/
+        {
+          tree->tree2d[2 * treepos + bit] = n; /*put the current code in it*/
+          treepos = 0;
+        }
+        else
+        {
+          /*put address of the next step in here, first that address has to be found of course
+          (it's just nodefilled + 1)...*/
+          nodefilled++;
+          /*addresses encoded with numcodes added to it*/
+          tree->tree2d[2 * treepos + bit] = nodefilled + tree->numcodes;
+          treepos = nodefilled;
+        }
+      }
+      else treepos = tree->tree2d[2 * treepos + bit] - tree->numcodes;
+    }
+  }
+
+  for(n = 0;  n < tree->numcodes * 2; n++)
+  {
+    if(tree->tree2d[n] == 32767) tree->tree2d[n] = 0; /*remove possible remaining 32767's*/
+  }
+
+  return 0;
+}
+
+/*
+Second step for the ...makeFromLengths and ...makeFromFrequencies functions.
+numcodes, lengths and maxbitlen must already be filled in correctly. return
+value is error.
+*/
+static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree)
+{
+  uivector blcount;
+  uivector nextcode;
+  unsigned bits, n, error = 0;
+
+  uivector_init(&blcount);
+  uivector_init(&nextcode);
+
+  tree->tree1d = (unsigned*)mymalloc(tree->numcodes * sizeof(unsigned));
+  if(!tree->tree1d) error = 83; /*alloc fail*/
+
+  if(!uivector_resizev(&blcount, tree->maxbitlen + 1, 0)
+  || !uivector_resizev(&nextcode, tree->maxbitlen + 1, 0))
+    error = 83; /*alloc fail*/
+
+  if(!error)
+  {
+    /*step 1: count number of instances of each code length*/
+    for(bits = 0; bits < tree->numcodes; bits++) blcount.data[tree->lengths[bits]]++;
+    /*step 2: generate the nextcode values*/
+    for(bits = 1; bits <= tree->maxbitlen; bits++)
+    {
+      nextcode.data[bits] = (nextcode.data[bits - 1] + blcount.data[bits - 1]) << 1;
+    }
+    /*step 3: generate all the codes*/
+    for(n = 0; n < tree->numcodes; n++)
+    {
+      if(tree->lengths[n] != 0) tree->tree1d[n] = nextcode.data[tree->lengths[n]]++;
+    }
+  }
+
+  uivector_cleanup(&blcount);
+  uivector_cleanup(&nextcode);
+
+  if(!error) return HuffmanTree_make2DTree(tree);
+  else return error;
+}
+
+/*
+given the code lengths (as stored in the PNG file), generate the tree as defined
+by Deflate. maxbitlen is the maximum bits that a code in the tree can have.
+return value is error.
+*/
+static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen,
+                                            size_t numcodes, unsigned maxbitlen)
+{
+  unsigned i;
+  tree->lengths = (unsigned*)mymalloc(numcodes * sizeof(unsigned));
+  if(!tree->lengths) return 83; /*alloc fail*/
+  for(i = 0; i < numcodes; i++) tree->lengths[i] = bitlen[i];
+  tree->numcodes = (unsigned)numcodes; /*number of symbols*/
+  tree->maxbitlen = maxbitlen;
+  return HuffmanTree_makeFromLengths2(tree);
+}
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/*
+A coin, this is the terminology used for the package-merge algorithm and the
+coin collector's problem. This is used to generate the huffman tree.
+A coin can be multiple coins (when they're merged)
+*/
+typedef struct Coin
+{
+  uivector symbols;
+  float weight; /*the sum of all weights in this coin*/
+} Coin;
+
+static void coin_init(Coin* c)
+{
+  uivector_init(&c->symbols);
+}
+
+/*argument c is void* so that this dtor can be given as function pointer to the vector resize function*/
+static void coin_cleanup(void* c)
+{
+  uivector_cleanup(&((Coin*)c)->symbols);
+}
+
+static void coin_copy(Coin* c1, const Coin* c2)
+{
+  c1->weight = c2->weight;
+  uivector_copy(&c1->symbols, &c2->symbols);
+}
+
+static void add_coins(Coin* c1, const Coin* c2)
+{
+  size_t i;
+  for(i = 0; i < c2->symbols.size; i++) uivector_push_back(&c1->symbols, c2->symbols.data[i]);
+  c1->weight += c2->weight;
+}
+
+static void init_coins(Coin* coins, size_t num)
+{
+  size_t i;
+  for(i = 0; i < num; i++) coin_init(&coins[i]);
+}
+
+static void cleanup_coins(Coin* coins, size_t num)
+{
+  size_t i;
+  for(i = 0; i < num; i++) coin_cleanup(&coins[i]);
+}
+
+/*
+This uses a simple combsort to sort the data. This function is not critical for
+overall encoding speed and the data amount isn't that large.
+*/
+static void sort_coins(Coin* data, size_t amount)
+{
+  size_t gap = amount;
+  unsigned char swapped = 0;
+  while((gap > 1) || swapped)
+  {
+    size_t i;
+    gap = (gap * 10) / 13; /*shrink factor 1.3*/
+    if(gap == 9 || gap == 10) gap = 11; /*combsort11*/
+    if(gap < 1) gap = 1;
+    swapped = 0;
+    for(i = 0; i < amount - gap; i++)
+    {
+      size_t j = i + gap;
+      if(data[j].weight < data[i].weight)
+      {
+        float temp = data[j].weight; data[j].weight = data[i].weight; data[i].weight = temp;
+        uivector_swap(&data[i].symbols, &data[j].symbols);
+        swapped = 1;
+      }
+    }
+  }
+}
+
+static unsigned append_symbol_coins(Coin* coins, const unsigned* frequencies, unsigned numcodes, size_t sum)
+{
+  unsigned i;
+  unsigned j = 0; /*index of present symbols*/
+  for(i = 0; i < numcodes; i++)
+  {
+    if(frequencies[i] != 0) /*only include symbols that are present*/
+    {
+      coins[j].weight = frequencies[i] / (float)sum;
+      uivector_push_back(&coins[j].symbols, i);
+      j++;
+    }
+  }
+  return 0;
+}
+
+unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies,
+                                      size_t numcodes, unsigned maxbitlen)
+{
+  unsigned i, j;
+  size_t sum = 0, numpresent = 0;
+  unsigned error = 0;
+  Coin* coins; /*the coins of the currently calculated row*/
+  Coin* prev_row; /*the previous row of coins*/
+  unsigned numcoins;
+  unsigned coinmem;
+
+  if(numcodes == 0) return 80; /*error: a tree of 0 symbols is not supposed to be made*/
+
+  for(i = 0; i < numcodes; i++)
+  {
+    if(frequencies[i] > 0)
+    {
+      numpresent++;
+      sum += frequencies[i];
+    }
+  }
+
+  for(i = 0; i < numcodes; i++) lengths[i] = 0;
+
+  /*there are no symbols at all, in that case add one symbol of value 0 to the tree (see RFC 1951 section 3.2.7) */
+  if(numpresent == 0)
+  {
+    lengths[0] = 1;
+  }
+  /*the package merge algorithm gives wrong results if there's only one symbol
+  (theoretically 0 bits would then suffice, but we need a proper symbol for zlib)*/
+  else if(numpresent == 1)
+  {
+    for(i = 0; i < numcodes; i++) if(frequencies[i]) lengths[i] = 1;
+  }
+  else
+  {
+    /*Package-Merge algorithm represented by coin collector's problem
+    For every symbol, maxbitlen coins will be created*/
+
+    coinmem = numpresent * 2; /*max amount of coins needed with the current algo*/
+    coins = (Coin*)mymalloc(sizeof(Coin) * coinmem);
+    prev_row = (Coin*)mymalloc(sizeof(Coin) * coinmem);
+    if(!coins || !prev_row) return 83; /*alloc fail*/
+    init_coins(coins, coinmem);
+    init_coins(prev_row, coinmem);
+
+    /*first row, lowest denominator*/
+    error = append_symbol_coins(coins, frequencies, numcodes, sum);
+    numcoins = numpresent;
+    sort_coins(coins, numcoins);
+    if(!error)
+    {
+      unsigned numprev = 0;
+      for(j = 1; j <= maxbitlen && !error; j++) /*each of the remaining rows*/
+      {
+        unsigned tempnum;
+        Coin* tempcoins;
+        /*swap prev_row and coins, and their amounts*/
+        tempcoins = prev_row; prev_row = coins; coins = tempcoins;
+        tempnum = numprev; numprev = numcoins; numcoins = tempnum;
+
+        cleanup_coins(coins, numcoins);
+        init_coins(coins, numcoins);
+
+        numcoins = 0;
+
+        /*fill in the merged coins of the previous row*/
+        for(i = 0; i + 1 < numprev; i += 2)
+        {
+          /*merge prev_row[i] and prev_row[i + 1] into new coin*/
+          Coin* coin = &coins[numcoins++];
+          coin_copy(coin, &prev_row[i]);
+          add_coins(coin, &prev_row[i + 1]);
+        }
+        /*fill in all the original symbols again*/
+        if(j < maxbitlen)
+        {
+          error = append_symbol_coins(coins + numcoins, frequencies, numcodes, sum);
+          numcoins += numpresent;
+        }
+        sort_coins(coins, numcoins);
+      }
+    }
+
+    if(!error)
+    {
+      /*calculate the lenghts of each symbol, as the amount of times a coin of each symbol is used*/
+      for(i = 0; i < numpresent - 1; i++)
+      {
+        Coin* coin = &coins[i];
+        for(j = 0; j < coin->symbols.size; j++) lengths[coin->symbols.data[j]]++;
+      }
+    }
+
+    cleanup_coins(coins, coinmem);
+    myfree(coins);
+    cleanup_coins(prev_row, coinmem);
+    myfree(prev_row);
+  }
+
+  return error;
+}
+
+/*Create the Huffman tree given the symbol frequencies*/
+static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigned* frequencies,
+                                                size_t numcodes, unsigned maxbitlen)
+{
+  unsigned error = 0;
+  tree->maxbitlen = maxbitlen;
+  tree->numcodes = (unsigned)numcodes; /*number of symbols*/
+  tree->lengths = (unsigned*)myrealloc(tree->lengths, numcodes * sizeof(unsigned));
+  if(!tree->lengths) return 83; /*alloc fail*/
+  /*initialize all lengths to 0*/
+  memset(tree->lengths, 0, numcodes * sizeof(unsigned));
+
+  error = lodepng_huffman_code_lengths(tree->lengths, frequencies, numcodes, maxbitlen);
+  if(!error) error = HuffmanTree_makeFromLengths2(tree);
+  return error;
+}
+
+static unsigned HuffmanTree_getCode(const HuffmanTree* tree, unsigned index)
+{
+  return tree->tree1d[index];
+}
+
+static unsigned HuffmanTree_getLength(const HuffmanTree* tree, unsigned index)
+{
+  return tree->lengths[index];
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/*get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/
+static unsigned generateFixedLitLenTree(HuffmanTree* tree)
+{
+  unsigned i, error = 0;
+  unsigned* bitlen = (unsigned*)mymalloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned));
+  if(!bitlen) return 83; /*alloc fail*/
+
+  /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/
+  for(i =   0; i <= 143; i++) bitlen[i] = 8;
+  for(i = 144; i <= 255; i++) bitlen[i] = 9;
+  for(i = 256; i <= 279; i++) bitlen[i] = 7;
+  for(i = 280; i <= 287; i++) bitlen[i] = 8;
+
+  error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DEFLATE_CODE_SYMBOLS, 15);
+
+  myfree(bitlen);
+  return error;
+}
+
+/*get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/
+static unsigned generateFixedDistanceTree(HuffmanTree* tree)
+{
+  unsigned i, error = 0;
+  unsigned* bitlen = (unsigned*)mymalloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned));
+  if(!bitlen) return 83; /*alloc fail*/
+
+  /*there are 32 distance codes, but 30-31 are unused*/
+  for(i = 0; i < NUM_DISTANCE_SYMBOLS; i++) bitlen[i] = 5;
+  error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DISTANCE_SYMBOLS, 15);
+
+  myfree(bitlen);
+  return error;
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+/*
+returns the code, or (unsigned)(-1) if error happened
+inbitlength is the length of the complete buffer, in bits (so its byte length times 8)
+*/
+static unsigned huffmanDecodeSymbol(const unsigned char* in, size_t* bp,
+                                    const HuffmanTree* codetree, size_t inbitlength)
+{
+  unsigned treepos = 0, ct;
+  for(;;)
+  {
+    if(*bp >= inbitlength) return (unsigned)(-1); /*error: end of input memory reached without endcode*/
+    /*
+    decode the symbol from the tree. The "readBitFromStream" code is inlined in
+    the expression below because this is the biggest bottleneck while decoding
+    */
+    ct = codetree->tree2d[(treepos << 1) + READBIT(*bp, in)];
+    (*bp)++;
+    if(ct < codetree->numcodes) return ct; /*the symbol is decoded, return it*/
+    else treepos = ct - codetree->numcodes; /*symbol not yet decoded, instead move tree position*/
+
+    if(treepos >= codetree->numcodes) return (unsigned)(-1); /*error: it appeared outside the codetree*/
+  }
+}
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Inflator (Decompressor)                                                / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*get the tree of a deflated block with fixed tree, as specified in the deflate specification*/
+static void getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d)
+{
+  /*TODO: check for out of memory errors*/
+  generateFixedLitLenTree(tree_ll);
+  generateFixedDistanceTree(tree_d);
+}
+
+/*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/
+static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d,
+                                      const unsigned char* in, size_t* bp, size_t inlength)
+{
+  /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/
+  unsigned error = 0;
+  unsigned n, HLIT, HDIST, HCLEN, i;
+  size_t inbitlength = inlength * 8;
+
+  /*see comments in deflateDynamic for explanation of the context and these variables, it is analogous*/
+  unsigned* bitlen_ll = 0; /*lit,len code lengths*/
+  unsigned* bitlen_d = 0; /*dist code lengths*/
+  /*code length code lengths ("clcl"), the bit lengths of the huffman tree used to compress bitlen_ll and bitlen_d*/
+  unsigned* bitlen_cl = 0;
+  HuffmanTree tree_cl; /*the code tree for code length codes (the huffman tree for compressed huffman trees)*/
+
+  if((*bp) >> 3 >= inlength - 2) return 49; /*error: the bit pointer is or will go past the memory*/
+
+  /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/
+  HLIT =  readBitsFromStream(bp, in, 5) + 257;
+  /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/
+  HDIST = readBitsFromStream(bp, in, 5) + 1;
+  /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/
+  HCLEN = readBitsFromStream(bp, in, 4) + 4;
+
+  HuffmanTree_init(&tree_cl);
+
+  while(!error)
+  {
+    /*read the code length codes out of 3 * (amount of code length codes) bits*/
+
+    bitlen_cl = (unsigned*)mymalloc(NUM_CODE_LENGTH_CODES * sizeof(unsigned));
+    if(!bitlen_cl) ERROR_BREAK(83 /*alloc fail*/);
+
+    for(i = 0; i < NUM_CODE_LENGTH_CODES; i++)
+    {
+      if(i < HCLEN) bitlen_cl[CLCL_ORDER[i]] = readBitsFromStream(bp, in, 3);
+      else bitlen_cl[CLCL_ORDER[i]] = 0; /*if not, it must stay 0*/
+    }
+
+    error = HuffmanTree_makeFromLengths(&tree_cl, bitlen_cl, NUM_CODE_LENGTH_CODES, 7);
+    if(error) break;
+
+    /*now we can use this tree to read the lengths for the tree that this function will return*/
+    bitlen_ll = (unsigned*)mymalloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned));
+    bitlen_d = (unsigned*)mymalloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned));
+    if(!bitlen_ll || !bitlen_d) ERROR_BREAK(83 /*alloc fail*/);
+    for(i = 0; i < NUM_DEFLATE_CODE_SYMBOLS; i++) bitlen_ll[i] = 0;
+    for(i = 0; i < NUM_DISTANCE_SYMBOLS; i++) bitlen_d[i] = 0;
+
+    /*i is the current symbol we're reading in the part that contains the code lengths of lit/len and dist codes*/
+    i = 0;
+    while(i < HLIT + HDIST)
+    {
+      unsigned code = huffmanDecodeSymbol(in, bp, &tree_cl, inbitlength);
+      if(code <= 15) /*a length code*/
+      {
+        if(i < HLIT) bitlen_ll[i] = code;
+        else bitlen_d[i - HLIT] = code;
+        i++;
+      }
+      else if(code == 16) /*repeat previous*/
+      {
+        unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/
+        unsigned value; /*set value to the previous code*/
+
+        if(*bp >= inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/
+        if (i == 0) ERROR_BREAK(54); /*can't repeat previous if i is 0*/
+
+        replength += readBitsFromStream(bp, in, 2);
+
+        if(i < HLIT + 1) value = bitlen_ll[i - 1];
+        else value = bitlen_d[i - HLIT - 1];
+        /*repeat this value in the next lengths*/
+        for(n = 0; n < replength; n++)
+        {
+          if(i >= HLIT + HDIST) ERROR_BREAK(13); /*error: i is larger than the amount of codes*/
+          if(i < HLIT) bitlen_ll[i] = value;
+          else bitlen_d[i - HLIT] = value;
+          i++;
+        }
+      }
+      else if(code == 17) /*repeat "0" 3-10 times*/
+      {
+        unsigned replength = 3; /*read in the bits that indicate repeat length*/
+        if(*bp >= inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/
+
+        replength += readBitsFromStream(bp, in, 3);
+
+        /*repeat this value in the next lengths*/
+        for(n = 0; n < replength; n++)
+        {
+          if(i >= HLIT + HDIST) ERROR_BREAK(14); /*error: i is larger than the amount of codes*/
+
+          if(i < HLIT) bitlen_ll[i] = 0;
+          else bitlen_d[i - HLIT] = 0;
+          i++;
+        }
+      }
+      else if(code == 18) /*repeat "0" 11-138 times*/
+      {
+        unsigned replength = 11; /*read in the bits that indicate repeat length*/
+        if(*bp >= inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/
+
+        replength += readBitsFromStream(bp, in, 7);
+
+        /*repeat this value in the next lengths*/
+        for(n = 0; n < replength; n++)
+        {
+          if(i >= HLIT + HDIST) ERROR_BREAK(15); /*error: i is larger than the amount of codes*/
+
+          if(i < HLIT) bitlen_ll[i] = 0;
+          else bitlen_d[i - HLIT] = 0;
+          i++;
+        }
+      }
+      else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/
+      {
+        if(code == (unsigned)(-1))
+        {
+          /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol
+          (10=no endcode, 11=wrong jump outside of tree)*/
+          error = (*bp) > inbitlength ? 10 : 11;
+        }
+        else error = 16; /*unexisting code, this can never happen*/
+        break;
+      }
+    }
+    if(error) break;
+
+    if(bitlen_ll[256] == 0) ERROR_BREAK(64); /*the length of the end code 256 must be larger than 0*/
+
+    /*now we've finally got HLIT and HDIST, so generate the code trees, and the function is done*/
+    error = HuffmanTree_makeFromLengths(tree_ll, bitlen_ll, NUM_DEFLATE_CODE_SYMBOLS, 15);
+    if(error) break;
+    error = HuffmanTree_makeFromLengths(tree_d, bitlen_d, NUM_DISTANCE_SYMBOLS, 15);
+
+    break; /*end of error-while*/
+  }
+
+  myfree(bitlen_cl);
+  myfree(bitlen_ll);
+  myfree(bitlen_d);
+  HuffmanTree_cleanup(&tree_cl);
+
+  return error;
+}
+
+/*inflate a block with dynamic of fixed Huffman tree*/
+static unsigned inflateHuffmanBlock(ucvector* out, const unsigned char* in, size_t* bp,
+                                    size_t* pos, size_t inlength, unsigned btype)
+{
+  unsigned error = 0;
+  HuffmanTree tree_ll; /*the huffman tree for literal and length codes*/
+  HuffmanTree tree_d; /*the huffman tree for distance codes*/
+  size_t inbitlength = inlength * 8;
+
+  HuffmanTree_init(&tree_ll);
+  HuffmanTree_init(&tree_d);
+
+  if(btype == 1) getTreeInflateFixed(&tree_ll, &tree_d);
+  else if(btype == 2)
+  {
+    error = getTreeInflateDynamic(&tree_ll, &tree_d, in, bp, inlength);
+  }
+
+  while(!error) /*decode all symbols until end reached, breaks at end code*/
+  {
+    /*code_ll is literal, length or end code*/
+    unsigned code_ll = huffmanDecodeSymbol(in, bp, &tree_ll, inbitlength);
+    if(code_ll <= 255) /*literal symbol*/
+    {
+      if((*pos) >= out->size)
+      {
+        /*reserve more room at once*/
+        if(!ucvector_resize(out, ((*pos) + 1) * 2)) ERROR_BREAK(83 /*alloc fail*/);
+      }
+      out->data[(*pos)] = (unsigned char)(code_ll);
+      (*pos)++;
+    }
+    else if(code_ll >= FIRST_LENGTH_CODE_INDEX && code_ll <= LAST_LENGTH_CODE_INDEX) /*length code*/
+    {
+      unsigned code_d, distance;
+      unsigned numextrabits_l, numextrabits_d; /*extra bits for length and distance*/
+      size_t start, forward, backward, length;
+
+      /*part 1: get length base*/
+      length = LENGTHBASE[code_ll - FIRST_LENGTH_CODE_INDEX];
+
+      /*part 2: get extra bits and add the value of that to length*/
+      numextrabits_l = LENGTHEXTRA[code_ll - FIRST_LENGTH_CODE_INDEX];
+      if(*bp >= inbitlength) ERROR_BREAK(51); /*error, bit pointer will jump past memory*/
+      length += readBitsFromStream(bp, in, numextrabits_l);
+
+      /*part 3: get distance code*/
+      code_d = huffmanDecodeSymbol(in, bp, &tree_d, inbitlength);
+      if(code_d > 29)
+      {
+        if(code_ll == (unsigned)(-1)) /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/
+        {
+          /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol
+          (10=no endcode, 11=wrong jump outside of tree)*/
+          error = (*bp) > inlength * 8 ? 10 : 11;
+        }
+        else error = 18; /*error: invalid distance code (30-31 are never used)*/
+        break;
+      }
+      distance = DISTANCEBASE[code_d];
+
+      /*part 4: get extra bits from distance*/
+      numextrabits_d = DISTANCEEXTRA[code_d];
+      if(*bp >= inbitlength) ERROR_BREAK(51); /*error, bit pointer will jump past memory*/
+
+      distance += readBitsFromStream(bp, in, numextrabits_d);
+
+      /*part 5: fill in all the out[n] values based on the length and dist*/
+      start = (*pos);
+      if(distance > start) ERROR_BREAK(52); /*too long backward distance*/
+      backward = start - distance;
+      if((*pos) + length >= out->size)
+      {
+        /*reserve more room at once*/
+        if(!ucvector_resize(out, ((*pos) + length) * 2)) ERROR_BREAK(83 /*alloc fail*/);
+      }
+
+      for(forward = 0; forward < length; forward++)
+      {
+        out->data[(*pos)] = out->data[backward];
+        (*pos)++;
+        backward++;
+        if(backward >= start) backward = start - distance;
+      }
+    }
+    else if(code_ll == 256)
+    {
+      break; /*end code, break the loop*/
+    }
+    else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/
+    {
+      /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol
+      (10=no endcode, 11=wrong jump outside of tree)*/
+      error = (*bp) > inlength * 8 ? 10 : 11;
+      break;
+    }
+  }
+
+  HuffmanTree_cleanup(&tree_ll);
+  HuffmanTree_cleanup(&tree_d);
+
+  return error;
+}
+
+static unsigned inflateNoCompression(ucvector* out, const unsigned char* in, size_t* bp, size_t* pos, size_t inlength)
+{
+  /*go to first boundary of byte*/
+  size_t p;
+  unsigned LEN, NLEN, n, error = 0;
+  while(((*bp) & 0x7) != 0) (*bp)++;
+  p = (*bp) / 8; /*byte position*/
+
+  /*read LEN (2 bytes) and NLEN (2 bytes)*/
+  if(p >= inlength - 4) return 52; /*error, bit pointer will jump past memory*/
+  LEN = in[p] + 256 * in[p + 1]; p += 2;
+  NLEN = in[p] + 256 * in[p + 1]; p += 2;
+
+  /*check if 16-bit NLEN is really the one's complement of LEN*/
+  if(LEN + NLEN != 65535) return 21; /*error: NLEN is not one's complement of LEN*/
+
+  if((*pos) + LEN >= out->size)
+  {
+    if(!ucvector_resize(out, (*pos) + LEN)) return 83; /*alloc fail*/
+  }
+
+  /*read the literal data: LEN bytes are now stored in the out buffer*/
+  if(p + LEN > inlength) return 23; /*error: reading outside of in buffer*/
+  for(n = 0; n < LEN; n++) out->data[(*pos)++] = in[p++];
+
+  (*bp) = p * 8;
+
+  return error;
+}
+
+static unsigned lodepng_inflatev(ucvector* out,
+                                 const unsigned char* in, size_t insize,
+                                 const LodePNGDecompressSettings* settings)
+{
+  /*bit pointer in the "in" data, current byte is bp >> 3, current bit is bp & 0x7 (from lsb to msb of the byte)*/
+  size_t bp = 0;
+  unsigned BFINAL = 0;
+  size_t pos = 0; /*byte position in the out buffer*/
+
+  unsigned error = 0;
+
+  (void)settings;
+
+  while(!BFINAL)
+  {
+    unsigned BTYPE;
+    if(bp + 2 >= insize * 8) return 52; /*error, bit pointer will jump past memory*/
+    BFINAL = readBitFromStream(&bp, in);
+    BTYPE = 1 * readBitFromStream(&bp, in);
+    BTYPE += 2 * readBitFromStream(&bp, in);
+
+    if(BTYPE == 3) return 20; /*error: invalid BTYPE*/
+    else if(BTYPE == 0) error = inflateNoCompression(out, in, &bp, &pos, insize); /*no compression*/
+    else error = inflateHuffmanBlock(out, in, &bp, &pos, insize, BTYPE); /*compression, BTYPE 01 or 10*/
+
+    if(error) return error;
+  }
+
+  /*Only now we know the true size of out, resize it to that*/
+  if(!ucvector_resize(out, pos)) error = 83; /*alloc fail*/
+
+  return error;
+}
+
+unsigned lodepng_inflate(unsigned char** out, size_t* outsize,
+                         const unsigned char* in, size_t insize,
+                         const LodePNGDecompressSettings* settings)
+{
+#if LODEPNG_CUSTOM_ZLIB_DECODER == 2
+  if(settings->custom_decoder)
+  {
+    return lodepng_custom_inflate(out, outsize, in, insize, settings);
+  }
+  else
+  {
+#endif /*LODEPNG_CUSTOM_ZLIB_DECODER == 2*/
+    unsigned error;
+    ucvector v;
+    ucvector_init_buffer(&v, *out, *outsize);
+    error = lodepng_inflatev(&v, in, insize, settings);
+    *out = v.data;
+    *outsize = v.size;
+    return error;
+#if LODEPNG_CUSTOM_ZLIB_DECODER == 2
+  }
+#endif /*LODEPNG_CUSTOM_ZLIB_DECODER == 2*/
+}
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Deflator (Compressor)                                                  / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+static const size_t MAX_SUPPORTED_DEFLATE_LENGTH = 258;
+
+/*bitlen is the size in bits of the code*/
+static void addHuffmanSymbol(size_t* bp, ucvector* compressed, unsigned code, unsigned bitlen)
+{
+  addBitsToStreamReversed(bp, compressed, code, bitlen);
+}
+
+/*search the index in the array, that has the largest value smaller than or equal to the given value,
+given array must be sorted (if no value is smaller, it returns the size of the given array)*/
+static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value)
+{
+  /*linear search implementation*/
+  /*for(size_t i = 1; i < array_size; i++) if(array[i] > value) return i - 1;
+  return array_size - 1;*/
+
+  /*binary search implementation (not that much faster) (precondition: array_size > 0)*/
+  size_t left  = 1;
+  size_t right = array_size - 1;
+  while(left <= right)
+  {
+    size_t mid = (left + right) / 2;
+    if(array[mid] <= value) left = mid + 1; /*the value to find is more to the right*/
+    else if(array[mid - 1] > value) right = mid - 1; /*the value to find is more to the left*/
+    else return mid - 1;
+  }
+  return array_size - 1;
+}
+
+static void addLengthDistance(uivector* values, size_t length, size_t distance)
+{
+  /*values in encoded vector are those used by deflate:
+  0-255: literal bytes
+  256: end
+  257-285: length/distance pair (length code, followed by extra length bits, distance code, extra distance bits)
+  286-287: invalid*/
+
+  unsigned length_code = (unsigned)searchCodeIndex(LENGTHBASE, 29, length);
+  unsigned extra_length = (unsigned)(length - LENGTHBASE[length_code]);
+  unsigned dist_code = (unsigned)searchCodeIndex(DISTANCEBASE, 30, distance);
+  unsigned extra_distance = (unsigned)(distance - DISTANCEBASE[dist_code]);
+
+  uivector_push_back(values, length_code + FIRST_LENGTH_CODE_INDEX);
+  uivector_push_back(values, extra_length);
+  uivector_push_back(values, dist_code);
+  uivector_push_back(values, extra_distance);
+}
+
+static const unsigned HASH_NUM_VALUES = 65536;
+static const unsigned HASH_NUM_CHARACTERS = 3;
+static const unsigned HASH_SHIFT = 2;
+/*
+The HASH_NUM_CHARACTERS value is used to make encoding faster by using longer
+sequences to generate a hash value from the stream bytes. Setting it to 3
+gives exactly the same compression as the brute force method, since deflate's
+run length encoding starts with lengths of 3. Setting it to higher values,
+like 6, can make the encoding faster (not always though!), but will cause the
+encoding to miss any length between 3 and this value, so that the compression
+may be worse (but this can vary too depending on the image, sometimes it is
+even a bit better instead).
+The HASH_NUM_VALUES is the amount of unique possible hash values that
+combinations of bytes can give, the higher it is the more memory is needed, but
+if it's too low the advantage of hashing is gone.
+*/
+
+typedef struct Hash
+{
+  int* head; /*hash value to head circular pos*/
+  int* val; /*circular pos to hash value*/
+  /*circular pos to prev circular pos*/
+  unsigned short* chain;
+  unsigned short* zeros;
+} Hash;
+
+static unsigned hash_init(Hash* hash, unsigned windowsize)
+{
+  unsigned i;
+  hash->head = (int*)mymalloc(sizeof(int) * HASH_NUM_VALUES);
+  hash->val = (int*)mymalloc(sizeof(int) * windowsize);
+  hash->chain = (unsigned short*)mymalloc(sizeof(unsigned short) * windowsize);
+  hash->zeros = (unsigned short*)mymalloc(sizeof(unsigned short) * windowsize);
+
+  if(!hash->head || !hash->val || !hash->chain || !hash->zeros) return 83; /*alloc fail*/
+
+  /*initialize hash table*/
+  for(i = 0; i < HASH_NUM_VALUES; i++) hash->head[i] = -1;
+  for(i = 0; i < windowsize; i++) hash->val[i] = -1;
+  for(i = 0; i < windowsize; i++) hash->chain[i] = i; /*same value as index indicates uninitialized*/
+
+  return 0;
+}
+
+static void hash_cleanup(Hash* hash)
+{
+  myfree(hash->head);
+  myfree(hash->val);
+  myfree(hash->chain);
+  myfree(hash->zeros);
+}
+
+static unsigned getHash(const unsigned char* data, size_t size, size_t pos)
+{
+  unsigned result = 0;
+  size_t amount, i;
+  if(pos >= size) return 0;
+  amount = HASH_NUM_CHARACTERS;
+  if(pos + amount >= size) amount = size - pos;
+  for(i = 0; i < amount; i++) result ^= (data[pos + i] << (i * HASH_SHIFT));
+  return result % HASH_NUM_VALUES;
+}
+
+static unsigned countZeros(const unsigned char* data, size_t size, size_t pos)
+{
+  const unsigned char* start = data + pos;
+  const unsigned char* end = start + MAX_SUPPORTED_DEFLATE_LENGTH;
+  if(end > data + size) end = data + size;
+  data = start;
+  while (data != end && *data == 0) data++;
+  return data - start;
+}
+
+static void updateHashChain(Hash* hash,
+                            size_t pos, int hashval, unsigned windowsize)
+{
+  unsigned wpos = pos % windowsize;
+  hash->val[wpos] = hashval;
+  if(hash->head[hashval] != -1)
+  {
+    hash->chain[wpos] = hash->head[hashval];
+  }
+  hash->head[hashval] = wpos;
+}
+
+/*Enable to use lazy instead of greedy matching. It looks one byte further
+to see if that one gives a longer distance. This gives slightly better compression, at the cost
+of a speed loss.*/
+#define LAZY_MATCHING
+
+/*
+LZ77-encode the data. Return value is error code. The input are raw bytes, the output
+is in the form of unsigned integers with codes representing for example literal bytes, or
+length/distance pairs.
+It uses a hash table technique to let it encode faster. When doing LZ77 encoding, a
+sliding window (of windowsize) is used, and all past bytes in that window can be used as
+the "dictionary". A brute force search through all possible distances would be slow, and
+this hash technique is one out of several ways to speed this up.
+*/
+static unsigned encodeLZ77(uivector* out, Hash* hash,
+                           const unsigned char* in, size_t inpos, size_t insize, unsigned windowsize)
+{
+  unsigned short numzeros = 0;
+  int usezeros = windowsize >= 8192; /*for small window size, the 'max chain length' optimization does a better job*/
+  unsigned pos, i, error = 0;
+
+  if(!error)
+  {
+    unsigned offset; /*the offset represents the distance in LZ77 terminology*/
+    unsigned length;
+#ifdef LAZY_MATCHING
+    unsigned lazy = 0;
+    unsigned lazylength = 0, lazyoffset = 0;
+#endif /*LAZY_MATCHING*/
+    unsigned hashval;
+    unsigned current_offset, current_length;
+    const unsigned char *lastptr, *foreptr, *backptr;
+    unsigned short hashpos, prevpos;
+
+    for(pos = inpos; pos < insize; pos++)
+    {
+      size_t wpos = pos % windowsize; /*position for in 'circular' hash buffers*/
+
+      hashval = getHash(in, insize, pos);
+      updateHashChain(hash, pos, hashval, windowsize);
+
+      if(usezeros && hashval == 0)
+      {
+        numzeros = countZeros(in, insize, pos);
+        hash->zeros[wpos] = numzeros;
+      }
+
+      /*the length and offset found for the current position*/
+      length = 0;
+      offset = 0;
+
+      prevpos = hash->head[hashval];
+      hashpos = hash->chain[prevpos];
+
+      lastptr = &in[insize < pos + MAX_SUPPORTED_DEFLATE_LENGTH ? insize : pos + MAX_SUPPORTED_DEFLATE_LENGTH];
+
+      /*search for the longest string*/
+      if(hash->val[wpos] == (int)hashval)
+      {
+        /*for large window lengths, assume the user wants no compression loss. Otherwise, max hash chain length speedup.*/
+        unsigned maxchainlength = windowsize >= 8192 ? windowsize : windowsize / 8;
+        for(;;)
+        {
+          /*stop when went completely around the circular buffer*/
+          if(prevpos < wpos && hashpos > prevpos && hashpos <= wpos) break;
+          if(prevpos > wpos && (hashpos <= wpos || hashpos > prevpos)) break;
+          if(maxchainlength-- == 0) break;
+
+          current_offset = hashpos <= wpos ? wpos - hashpos : wpos - hashpos + windowsize;
+          if(current_offset > 0)
+          {
+            /*test the next characters*/
+            foreptr = &in[pos];
+            backptr = &in[pos - current_offset];
+
+            /*common case in PNGs is lots of zeros. Quickly skip over them as a speedup*/
+            if(usezeros && hashval == 0 && hash->val[hashpos] == 0 /*hashval[hashpos] may be out of date*/)
+            {
+              unsigned short skip = hash->zeros[hashpos];
+              if(skip > numzeros) skip = numzeros;
+              backptr += skip;
+              foreptr += skip;
+            }
+
+            /* multiple checks at once per array bounds check */
+            while(foreptr != lastptr && *backptr == *foreptr) /*maximum supported length by deflate is max length*/
+            {
+              ++backptr;
+              ++foreptr;
+            }
+            current_length = (unsigned)(foreptr - &in[pos]);
+
+            if(current_length > length)
+            {
+              length = current_length; /*the longest length*/
+              offset = current_offset; /*the offset that is related to this longest length*/
+              /*jump out once a length of max length is found (speed gain)*/
+              if(current_length == MAX_SUPPORTED_DEFLATE_LENGTH) break;
+            }
+          }
+
+          if(hashpos == hash->chain[hashpos]) break;
+
+          prevpos = hashpos;
+          hashpos = hash->chain[hashpos];
+        }
+      }
+
+#ifdef LAZY_MATCHING
+      if(!lazy && length >= 3 && length < MAX_SUPPORTED_DEFLATE_LENGTH)
+      {
+        lazy = 1;
+        lazylength = length;
+        lazyoffset = offset;
+        continue;
+      }
+      if(lazy)
+      {
+        lazy = 0;
+        if(pos == 0) ERROR_BREAK(81);
+        if(length > lazylength + 1)
+        {
+          /*push the previous character as literal*/
+          if(!uivector_push_back(out, in[pos - 1])) ERROR_BREAK(83 /*alloc fail*/);
+        }
+        else
+        {
+          length = lazylength;
+          offset = lazyoffset;
+          hash->head[hashval] = -1; /*the same hashchain update will be done, this ensures no wrong alteration*/
+          pos--;
+        }
+      }
+#endif /*LAZY_MATCHING*/
+
+      if(length >= 3 && offset > windowsize) ERROR_BREAK(86 /*too big (or overflown negative) offset*/);
+
+
+      /**encode it as length/distance pair or literal value**/
+      if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/
+      {
+        if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/);
+      }
+      else
+      {
+        if(length == 3 && offset > 2048)
+        {
+          /*compensate for the fact that longer offsets have more extra bits, a
+          length of only 3 may be not worth it then*/
+          if(!uivector_push_back(out, in[pos + 0])) ERROR_BREAK(83 /*alloc fail*/);
+          if(!uivector_push_back(out, in[pos + 1])) ERROR_BREAK(83 /*alloc fail*/);
+          if(!uivector_push_back(out, in[pos + 2])) ERROR_BREAK(83 /*alloc fail*/);
+        }
+        else
+        {
+          addLengthDistance(out, length, offset);
+        }
+        for(i = 1; i < length; i++)
+        {
+          pos++;
+          hashval = getHash(in, insize, pos);
+          updateHashChain(hash, pos, hashval, windowsize);
+          if(usezeros && hashval == 0)
+          {
+            hash->zeros[pos % windowsize] = countZeros(in, insize, pos);
+          }
+        }
+      }
+
+    } /*end of the loop through each character of input*/
+  } /*end of "if(!error)"*/
+
+  return error;
+}
+
+/* /////////////////////////////////////////////////////////////////////////// */
+
+static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize)
+{
+  /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte,
+  2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/
+
+  size_t i, j, numdeflateblocks = (datasize + 65534) / 65535;
+  unsigned datapos = 0;
+  for(i = 0; i < numdeflateblocks; i++)
+  {
+    unsigned BFINAL, BTYPE, LEN, NLEN;
+    unsigned char firstbyte;
+
+    BFINAL = (i == numdeflateblocks - 1);
+    BTYPE = 0;
+
+    firstbyte = (unsigned char)(BFINAL + ((BTYPE & 1) << 1) + ((BTYPE & 2) << 1));
+    ucvector_push_back(out, firstbyte);
+
+    LEN = 65535;
+    if(datasize - datapos < 65535) LEN = (unsigned)datasize - datapos;
+    NLEN = 65535 - LEN;
+
+    ucvector_push_back(out, (unsigned char)(LEN % 256));
+    ucvector_push_back(out, (unsigned char)(LEN / 256));
+    ucvector_push_back(out, (unsigned char)(NLEN % 256));
+    ucvector_push_back(out, (unsigned char)(NLEN / 256));
+
+    /*Decompressed data*/
+    for(j = 0; j < 65535 && datapos < datasize; j++)
+    {
+      ucvector_push_back(out, data[datapos++]);
+    }
+  }
+
+  return 0;
+}
+
+/*
+write the lz77-encoded data, which has lit, len and dist codes, to compressed stream using huffman trees.
+tree_ll: the tree for lit and len codes.
+tree_d: the tree for distance codes.
+*/
+static void writeLZ77data(size_t* bp, ucvector* out, const uivector* lz77_encoded,
+                          const HuffmanTree* tree_ll, const HuffmanTree* tree_d)
+{
+  size_t i = 0;
+  for(i = 0; i < lz77_encoded->size; i++)
+  {
+    unsigned val = lz77_encoded->data[i];
+    addHuffmanSymbol(bp, out, HuffmanTree_getCode(tree_ll, val), HuffmanTree_getLength(tree_ll, val));
+    if(val > 256) /*for a length code, 3 more things have to be added*/
+    {
+      unsigned length_index = val - FIRST_LENGTH_CODE_INDEX;
+      unsigned n_length_extra_bits = LENGTHEXTRA[length_index];
+      unsigned length_extra_bits = lz77_encoded->data[++i];
+
+      unsigned distance_code = lz77_encoded->data[++i];
+
+      unsigned distance_index = distance_code;
+      unsigned n_distance_extra_bits = DISTANCEEXTRA[distance_index];
+      unsigned distance_extra_bits = lz77_encoded->data[++i];
+
+      addBitsToStream(bp, out, length_extra_bits, n_length_extra_bits);
+      addHuffmanSymbol(bp, out, HuffmanTree_getCode(tree_d, distance_code),
+                       HuffmanTree_getLength(tree_d, distance_code));
+      addBitsToStream(bp, out, distance_extra_bits, n_distance_extra_bits);
+    }
+  }
+}
+
+/*Deflate for a block of type "dynamic", that is, with freely, optimally, created huffman trees*/
+static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash,
+                               const unsigned char* data, size_t datapos, size_t dataend,
+                               const LodePNGCompressSettings* settings, int final)
+{
+  unsigned error = 0;
+
+  /*
+  A block is compressed as follows: The PNG data is lz77 encoded, resulting in
+  literal bytes and length/distance pairs. This is then huffman compressed with
+  two huffman trees. One huffman tree is used for the lit and len values ("ll"),
+  another huffman tree is used for the dist values ("d"). These two trees are
+  stored using their code lengths, and to compress even more these code lengths
+  are also run-length encoded and huffman compressed. This gives a huffman tree
+  of code lengths "cl". The code lenghts used to describe this third tree are
+  the code length code lengths ("clcl").
+  */
+
+  /*The lz77 encoded data, represented with integers since there will also be length and distance codes in it*/
+  uivector lz77_encoded;
+  HuffmanTree tree_ll; /*tree for lit,len values*/
+  HuffmanTree tree_d; /*tree for distance codes*/
+  HuffmanTree tree_cl; /*tree for encoding the code lengths representing tree_ll and tree_d*/
+  uivector frequencies_ll; /*frequency of lit,len codes*/
+  uivector frequencies_d; /*frequency of dist codes*/
+  uivector frequencies_cl; /*frequency of code length codes*/
+  uivector bitlen_lld; /*lit,len,dist code lenghts (int bits), literally (without repeat codes).*/
+  uivector bitlen_lld_e; /*bitlen_lld encoded with repeat codes (this is a rudemtary run length compression)*/
+  /*bitlen_cl is the code length code lengths ("clcl"). The bit lengths of codes to represent tree_cl
+  (these are written as is in the file, it would be crazy to compress these using yet another huffman
+  tree that needs to be represented by yet another set of code lengths)*/
+  uivector bitlen_cl;
+  size_t datasize = dataend - datapos;
+
+  /*
+  Due to the huffman compression of huffman tree representations ("two levels"), there are some anologies:
+  bitlen_lld is to tree_cl what data is to tree_ll and tree_d.
+  bitlen_lld_e is to bitlen_lld what lz77_encoded is to data.
+  bitlen_cl is to bitlen_lld_e what bitlen_lld is to lz77_encoded.
+  */
+
+  unsigned BFINAL = final;
+  size_t numcodes_ll, numcodes_d, i;
+  unsigned HLIT, HDIST, HCLEN;
+
+  uivector_init(&lz77_encoded);
+  HuffmanTree_init(&tree_ll);
+  HuffmanTree_init(&tree_d);
+  HuffmanTree_init(&tree_cl);
+  uivector_init(&frequencies_ll);
+  uivector_init(&frequencies_d);
+  uivector_init(&frequencies_cl);
+  uivector_init(&bitlen_lld);
+  uivector_init(&bitlen_lld_e);
+  uivector_init(&bitlen_cl);
+
+  /*This while loop is never loops due to a break at the end, it is here to
+  allow breaking out of it to the cleanup phase on error conditions.*/
+  while(!error)
+  {
+    if(settings->use_lz77)
+    {
+      error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize); /*LZ77 encoded*/
+      if(error) break;
+    }
+    else
+    {
+      if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(83 /*alloc fail*/);
+      for(i = datapos; i < dataend; i++) lz77_encoded.data[i] = data[i]; /*no LZ77, but still will be Huffman compressed*/
+    }
+
+    if(!uivector_resizev(&frequencies_ll, 286, 0)) ERROR_BREAK(83 /*alloc fail*/);
+    if(!uivector_resizev(&frequencies_d, 30, 0)) ERROR_BREAK(83 /*alloc fail*/);
+
+    /*Count the frequencies of lit, len and dist codes*/
+    for(i = 0; i < lz77_encoded.size; i++)
+    {
+      unsigned symbol = lz77_encoded.data[i];
+      frequencies_ll.data[symbol]++;
+      if(symbol > 256)
+      {
+        unsigned dist = lz77_encoded.data[i + 2];
+        frequencies_d.data[dist]++;
+        i += 3;
+      }
+    }
+    frequencies_ll.data[256] = 1; /*there will be exactly 1 end code, at the end of the block*/
+
+    /*Make both huffman trees, one for the lit and len codes, one for the dist codes*/
+    error = HuffmanTree_makeFromFrequencies(&tree_ll, frequencies_ll.data, frequencies_ll.size, 15);
+    if(error) break;
+    error = HuffmanTree_makeFromFrequencies(&tree_d, frequencies_d.data, frequencies_d.size, 15);
+    if(error) break;
+
+    numcodes_ll = tree_ll.numcodes; if(numcodes_ll > 286) numcodes_ll = 286;
+    numcodes_d = tree_d.numcodes; if(numcodes_d > 30) numcodes_d = 30;
+    /*store the code lengths of both generated trees in bitlen_lld*/
+    for(i = 0; i < numcodes_ll; i++) uivector_push_back(&bitlen_lld, HuffmanTree_getLength(&tree_ll, (unsigned)i));
+    for(i = 0; i < numcodes_d; i++) uivector_push_back(&bitlen_lld, HuffmanTree_getLength(&tree_d, (unsigned)i));
+
+    /*run-length compress bitlen_ldd into bitlen_lld_e by using repeat codes 16 (copy length 3-6 times),
+    17 (3-10 zeroes), 18 (11-138 zeroes)*/
+    for(i = 0; i < (unsigned)bitlen_lld.size; i++)
+    {
+      unsigned j = 0; /*amount of repititions*/
+      while(i + j + 1 < (unsigned)bitlen_lld.size && bitlen_lld.data[i + j + 1] == bitlen_lld.data[i]) j++;
+
+      if(bitlen_lld.data[i] == 0 && j >= 2) /*repeat code for zeroes*/
+      {
+        j++; /*include the first zero*/
+        if(j <= 10) /*repeat code 17 supports max 10 zeroes*/
+        {
+          uivector_push_back(&bitlen_lld_e, 17);
+          uivector_push_back(&bitlen_lld_e, j - 3);
+        }
+        else /*repeat code 18 supports max 138 zeroes*/
+        {
+          if(j > 138) j = 138;
+          uivector_push_back(&bitlen_lld_e, 18);
+          uivector_push_back(&bitlen_lld_e, j - 11);
+        }
+        i += (j - 1);
+      }
+      else if(j >= 3) /*repeat code for value other than zero*/
+      {
+        size_t k;
+        unsigned num = j / 6, rest = j % 6;
+        uivector_push_back(&bitlen_lld_e, bitlen_lld.data[i]);
+        for(k = 0; k < num; k++)
+        {
+          uivector_push_back(&bitlen_lld_e, 16);
+          uivector_push_back(&bitlen_lld_e, 6 - 3);
+        }
+        if(rest >= 3)
+        {
+          uivector_push_back(&bitlen_lld_e, 16);
+          uivector_push_back(&bitlen_lld_e, rest - 3);
+        }
+        else j -= rest;
+        i += j;
+      }
+      else /*too short to benefit from repeat code*/
+      {
+        uivector_push_back(&bitlen_lld_e, bitlen_lld.data[i]);
+      }
+    }
+
+    /*generate tree_cl, the huffmantree of huffmantrees*/
+
+    if(!uivector_resizev(&frequencies_cl, NUM_CODE_LENGTH_CODES, 0)) ERROR_BREAK(83 /*alloc fail*/);
+    for(i = 0; i < bitlen_lld_e.size; i++)
+    {
+      frequencies_cl.data[bitlen_lld_e.data[i]]++;
+      /*after a repeat code come the bits that specify the number of repetitions,
+      those don't need to be in the frequencies_cl calculation*/
+      if(bitlen_lld_e.data[i] >= 16) i++;
+    }
+
+    error = HuffmanTree_makeFromFrequencies(&tree_cl, frequencies_cl.data, frequencies_cl.size, 7);
+    if(error) break;
+
+    if(!uivector_resize(&bitlen_cl, NUM_CODE_LENGTH_CODES)) ERROR_BREAK(83 /*alloc fail*/);
+    for(i = 0; i < NUM_CODE_LENGTH_CODES; i++)
+    {
+      /*lenghts of code length tree is in the order as specified by deflate*/
+      bitlen_cl.data[i] = HuffmanTree_getLength(&tree_cl, CLCL_ORDER[i]);
+    }
+    while(bitlen_cl.data[bitlen_cl.size - 1] == 0 && bitlen_cl.size > 4)
+    {
+      /*remove zeros at the end, but minimum size must be 4*/
+      if(!uivector_resize(&bitlen_cl, bitlen_cl.size - 1)) ERROR_BREAK(83 /*alloc fail*/);
+    }
+    if(error) break;
+
+    /*
+    Write everything into the output
+
+    After the BFINAL and BTYPE, the dynamic block consists out of the following:
+    - 5 bits HLIT, 5 bits HDIST, 4 bits HCLEN
+    - (HCLEN+4)*3 bits code lengths of code length alphabet
+    - HLIT + 257 code lenghts of lit/length alphabet (encoded using the code length
+      alphabet, + possible repetition codes 16, 17, 18)
+    - HDIST + 1 code lengths of distance alphabet (encoded using the code length
+      alphabet, + possible repetition codes 16, 17, 18)
+    - compressed data
+    - 256 (end code)
+    */
+
+    /*Write block type*/
+    addBitToStream(bp, out, BFINAL);
+    addBitToStream(bp, out, 0); /*first bit of BTYPE "dynamic"*/
+    addBitToStream(bp, out, 1); /*second bit of BTYPE "dynamic"*/
+
+    /*write the HLIT, HDIST and HCLEN values*/
+    HLIT = (unsigned)(numcodes_ll - 257);
+    HDIST = (unsigned)(numcodes_d - 1);
+    HCLEN = (unsigned)bitlen_cl.size - 4;
+    addBitsToStream(bp, out, HLIT, 5);
+    addBitsToStream(bp, out, HDIST, 5);
+    addBitsToStream(bp, out, HCLEN, 4);
+
+    /*write the code lenghts of the code length alphabet*/
+    for(i = 0; i < HCLEN + 4; i++) addBitsToStream(bp, out, bitlen_cl.data[i], 3);
+
+    /*write the lenghts of the lit/len AND the dist alphabet*/
+    for(i = 0; i < bitlen_lld_e.size; i++)
+    {
+      addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_cl, bitlen_lld_e.data[i]),
+                       HuffmanTree_getLength(&tree_cl, bitlen_lld_e.data[i]));
+      /*extra bits of repeat codes*/
+      if(bitlen_lld_e.data[i] == 16) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 2);
+      else if(bitlen_lld_e.data[i] == 17) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 3);
+      else if(bitlen_lld_e.data[i] == 18) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 7);
+    }
+
+    /*write the compressed data symbols*/
+    writeLZ77data(bp, out, &lz77_encoded, &tree_ll, &tree_d);
+    /*error: the length of the end code 256 must be larger than 0*/
+    if(HuffmanTree_getLength(&tree_ll, 256) == 0) ERROR_BREAK(64);
+
+    /*write the end code*/
+    addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256));
+
+    break; /*end of error-while*/
+  }
+
+  /*cleanup*/
+  uivector_cleanup(&lz77_encoded);
+  HuffmanTree_cleanup(&tree_ll);
+  HuffmanTree_cleanup(&tree_d);
+  HuffmanTree_cleanup(&tree_cl);
+  uivector_cleanup(&frequencies_ll);
+  uivector_cleanup(&frequencies_d);
+  uivector_cleanup(&frequencies_cl);
+  uivector_cleanup(&bitlen_lld_e);
+  uivector_cleanup(&bitlen_lld);
+  uivector_cleanup(&bitlen_cl);
+
+  return error;
+}
+
+static unsigned deflateFixed(ucvector* out, size_t* bp, Hash* hash,
+                             const unsigned char* data,
+                             size_t datapos, size_t dataend,
+                             const LodePNGCompressSettings* settings, int final)
+{
+  HuffmanTree tree_ll; /*tree for literal values and length codes*/
+  HuffmanTree tree_d; /*tree for distance codes*/
+
+  unsigned BFINAL = final;
+  unsigned error = 0;
+  size_t i;
+
+  HuffmanTree_init(&tree_ll);
+  HuffmanTree_init(&tree_d);
+
+  generateFixedLitLenTree(&tree_ll);
+  generateFixedDistanceTree(&tree_d);
+
+  addBitToStream(bp, out, BFINAL);
+  addBitToStream(bp, out, 1); /*first bit of BTYPE*/
+  addBitToStream(bp, out, 0); /*second bit of BTYPE*/
+
+  if(settings->use_lz77) /*LZ77 encoded*/
+  {
+    uivector lz77_encoded;
+    uivector_init(&lz77_encoded);
+    error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize);
+    if(!error) writeLZ77data(bp, out, &lz77_encoded, &tree_ll, &tree_d);
+    uivector_cleanup(&lz77_encoded);
+  }
+  else /*no LZ77, but still will be Huffman compressed*/
+  {
+    for(i = datapos; i < dataend; i++)
+    {
+      addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, data[i]), HuffmanTree_getLength(&tree_ll, data[i]));
+    }
+  }
+  /*add END code*/
+  if(!error) addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256));
+
+  /*cleanup*/
+  HuffmanTree_cleanup(&tree_ll);
+  HuffmanTree_cleanup(&tree_d);
+
+  return error;
+}
+
+static unsigned lodepng_deflatev(ucvector* out, const unsigned char* in, size_t insize,
+                                 const LodePNGCompressSettings* settings)
+{
+#if LODEPNG_CUSTOM_ZLIB_ENCODER == 2
+  if(settings->custom_encoder)
+  {
+    unsigned char** out2 = &out->data;
+    size_t* outsize = &out->size;
+
+    unsigned error = lodepng_custom_deflate(out2, outsize, in, insize, settings);
+
+    if(!error) ucvector_init_buffer(out, *out2, *outsize);
+    return error;
+  }
+  else
+  {
+#endif /*LODEPNG_CUSTOM_ZLIB_ENCODER == 2*/
+    unsigned error = 0;
+    size_t i, blocksize, numdeflateblocks;
+    size_t bp = 0; /*the bit pointer*/
+    Hash hash;
+
+    if(settings->btype > 2) return 61;
+
+    if(settings->btype == 0) return deflateNoCompression(out, in, insize);
+
+    if(settings->btype == 1) blocksize = insize;
+    else /*if(settings->btype == 2)*/
+    {
+      blocksize = insize / 8 + 8;
+      if(blocksize < 65535) blocksize = 65535;
+    }
+
+    numdeflateblocks = (insize + blocksize - 1) / blocksize;
+    if(numdeflateblocks == 0) numdeflateblocks = 1;
+
+    error = hash_init(&hash, settings->windowsize);
+    if(error) return error;
+
+    for(i = 0; i < numdeflateblocks && !error; i++)
+    {
+      int final = i == numdeflateblocks - 1;
+      size_t start = i * blocksize;
+      size_t end = start + blocksize;
+      if(end > insize) end = insize;
+
+      if(settings->btype == 1) error = deflateFixed(out, &bp, &hash, in, start, end, settings, final);
+      else if(settings->btype == 2) error = deflateDynamic(out, &bp, &hash, in, start, end, settings, final);
+    }
+
+    hash_cleanup(&hash);
+
+    return error;
+#if LODEPNG_CUSTOM_ZLIB_ENCODER == 2
+  }
+#endif /*LODEPNG_CUSTOM_ZLIB_ENCODER == 2*/
+}
+
+unsigned lodepng_deflate(unsigned char** out, size_t* outsize,
+                         const unsigned char* in, size_t insize,
+                         const LodePNGCompressSettings* settings)
+{
+  unsigned error;
+  ucvector v;
+  ucvector_init_buffer(&v, *out, *outsize);
+  error = lodepng_deflatev(&v, in, insize, settings);
+  *out = v.data;
+  *outsize = v.size;
+  return error;
+}
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Adler32                                                                  */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len)
+{
+   unsigned s1 = adler & 0xffff;
+   unsigned s2 = (adler >> 16) & 0xffff;
+
+  while(len > 0)
+  {
+    /*at least 5550 sums can be done before the sums overflow, saving a lot of module divisions*/
+    unsigned amount = len > 5550 ? 5550 : len;
+    len -= amount;
+    while(amount > 0)
+    {
+      s1 = (s1 + *data++);
+      s2 = (s2 + s1);
+      amount--;
+    }
+    s1 %= 65521;
+    s2 %= 65521;
+  }
+
+  return (s2 << 16) | s1;
+}
+
+/*Return the adler32 of the bytes data[0..len-1]*/
+static unsigned adler32(const unsigned char* data, unsigned len)
+{
+  return update_adler32(1L, data, len);
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Zlib                                                                   / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in,
+                                 size_t insize, const LodePNGDecompressSettings* settings)
+{
+#if LODEPNG_CUSTOM_ZLIB_DECODER == 1
+  if(settings->custom_decoder)
+  {
+    return lodepng_custom_zlib_decompress(out, outsize, in, insize, settings);
+  }
+  else
+  {
+#endif /*LODEPNG_CUSTOM_ZLIB_DECODER == 1*/
+    unsigned error = 0;
+    unsigned CM, CINFO, FDICT;
+
+    if(insize < 2) return 53; /*error, size of zlib data too small*/
+    /*read information from zlib header*/
+    if((in[0] * 256 + in[1]) % 31 != 0)
+    {
+      /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/
+      return 24;
+    }
+
+    CM = in[0] & 15;
+    CINFO = (in[0] >> 4) & 15;
+    /*FCHECK = in[1] & 31;*/ /*FCHECK is already tested above*/
+    FDICT = (in[1] >> 5) & 1;
+    /*FLEVEL = (in[1] >> 6) & 3;*/ /*FLEVEL is not used here*/
+
+    if(CM != 8 || CINFO > 7)
+    {
+      /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/
+      return 25;
+    }
+    if(FDICT != 0)
+    {
+      /*error: the specification of PNG says about the zlib stream:
+        "The additional flags shall not specify a preset dictionary."*/
+      return 26;
+    }
+
+    error = lodepng_inflate(out, outsize, in + 2, insize - 2, settings);
+    if(error) return error;
+
+    if(!settings->ignore_adler32)
+    {
+      unsigned ADLER32 = lodepng_read32bitInt(&in[insize - 4]);
+      unsigned checksum = adler32(*out, (unsigned)(*outsize));
+      if(checksum != ADLER32) return 58; /*error, adler checksum not correct, data must be corrupted*/
+    }
+
+    return 0; /*no error*/
+#if LODEPNG_CUSTOM_ZLIB_DECODER == 1
+  }
+#endif /*LODEPNG_CUSTOM_ZLIB_DECODER == 1*/
+}
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in,
+                               size_t insize, const LodePNGCompressSettings* settings)
+{
+#if LODEPNG_CUSTOM_ZLIB_ENCODER == 1
+  if(settings->custom_encoder)
+  {
+    return lodepng_custom_zlib_compress(out, outsize, in, insize, settings);
+  }
+  else
+  {
+#endif /*LODEPNG_CUSTOM_ZLIB_ENCODER == 1*/
+    /*initially, *out must be NULL and outsize 0, if you just give some random *out
+    that's pointing to a non allocated buffer, this'll crash*/
+    ucvector deflatedata, outv;
+    size_t i;
+    unsigned error;
+
+    unsigned ADLER32;
+    /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/
+    unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/
+    unsigned FLEVEL = 0;
+    unsigned FDICT = 0;
+    unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64;
+    unsigned FCHECK = 31 - CMFFLG % 31;
+    CMFFLG += FCHECK;
+
+    /*ucvector-controlled version of the output buffer, for dynamic array*/
+    ucvector_init_buffer(&outv, *out, *outsize);
+
+    ucvector_push_back(&outv, (unsigned char)(CMFFLG / 256));
+    ucvector_push_back(&outv, (unsigned char)(CMFFLG % 256));
+
+    ucvector_init(&deflatedata);
+    error = lodepng_deflatev(&deflatedata, in, insize, settings);
+
+    if(!error)
+    {
+      ADLER32 = adler32(in, (unsigned)insize);
+      for(i = 0; i < deflatedata.size; i++) ucvector_push_back(&outv, deflatedata.data[i]);
+      ucvector_cleanup(&deflatedata);
+      lodepng_add32bitInt(&outv, ADLER32);
+    }
+
+    *out = outv.data;
+    *outsize = outv.size;
+
+    return error;
+#if LODEPNG_CUSTOM_ZLIB_ENCODER == 1
+  }
+#endif /*LODEPNG_CUSTOM_ZLIB_ENCODER == 1*/
+}
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#else /*no LODEPNG_COMPILE_ZLIB*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+static unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in,
+                                        size_t insize, const LodePNGDecompressSettings* settings)
+{
+  return lodepng_custom_zlib_decompress(out, outsize, in, insize, settings);
+}
+#endif /*LODEPNG_COMPILE_DECODER*/
+#ifdef LODEPNG_COMPILE_ENCODER
+static unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in,
+                                      size_t insize, const LodePNGCompressSettings* settings)
+{
+  return lodepng_custom_zlib_compress(out, outsize, in, insize, settings);
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#endif /*LODEPNG_COMPILE_ZLIB*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/*this is a good tradeoff between speed and compression ratio*/
+#define DEFAULT_WINDOWSIZE 2048
+
+void lodepng_compress_settings_init(LodePNGCompressSettings* settings)
+{
+  /*compress with dynamic huffman tree (not in the mathematical sense, just not the predefined one)*/
+  settings->btype = 2;
+  settings->use_lz77 = 1;
+  settings->windowsize = DEFAULT_WINDOWSIZE;
+#if LODEPNG_CUSTOM_ZLIB_ENCODER == 0
+  settings->custom_encoder = 0;
+#else
+  settings->custom_encoder = 1;
+#endif
+}
+
+#if LODEPNG_CUSTOM_ZLIB_ENCODER == 0
+const LodePNGCompressSettings lodepng_default_compress_settings = {2, 1, DEFAULT_WINDOWSIZE, 0};
+#else
+const LodePNGCompressSettings lodepng_default_compress_settings = {2, 1, DEFAULT_WINDOWSIZE, 1};
+#endif
+
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings)
+{
+  settings->ignore_adler32 = 0;
+#if LODEPNG_CUSTOM_ZLIB_DECODER == 0
+  settings->custom_decoder = 0;
+#else
+  settings->custom_decoder = 1;
+#endif
+}
+
+#if LODEPNG_CUSTOM_ZLIB_DECODER == 0
+const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 0};
+#else
+const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 1};
+#endif
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* // End of Zlib related code. Begin of PNG related code.                 // */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_PNG
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / CRC32                                                                  / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+static unsigned Crc32_crc_table_computed = 0;
+static unsigned Crc32_crc_table[256];
+
+/*Make the table for a fast CRC.*/
+static void Crc32_make_crc_table(void)
+{
+  unsigned c, k, n;
+  for(n = 0; n < 256; n++)
+  {
+    c = n;
+    for(k = 0; k < 8; k++)
+    {
+      if(c & 1) c = 0xedb88320L ^ (c >> 1);
+      else c = c >> 1;
+    }
+    Crc32_crc_table[n] = c;
+  }
+  Crc32_crc_table_computed = 1;
+}
+
+/*Update a running CRC with the bytes buf[0..len-1]--the CRC should be
+initialized to all 1's, and the transmitted value is the 1's complement of the
+final running CRC (see the crc() routine below).*/
+static unsigned Crc32_update_crc(const unsigned char* buf, unsigned crc, size_t len)
+{
+  unsigned c = crc;
+  size_t n;
+
+  if(!Crc32_crc_table_computed) Crc32_make_crc_table();
+  for(n = 0; n < len; n++)
+  {
+    c = Crc32_crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
+  }
+  return c;
+}
+
+/*Return the CRC of the bytes buf[0..len-1].*/
+unsigned lodepng_crc32(const unsigned char* buf, size_t len)
+{
+  return Crc32_update_crc(buf, 0xffffffffL, len) ^ 0xffffffffL;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Reading and writing single bits and bytes from/to stream for LodePNG   / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream)
+{
+  unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1);
+  (*bitpointer)++;
+  return result;
+}
+
+static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits)
+{
+  unsigned result = 0;
+  size_t i;
+  for(i = nbits - 1; i < nbits; i--)
+  {
+    result += (unsigned)readBitFromReversedStream(bitpointer, bitstream) << i;
+  }
+  return result;
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+static void setBitOfReversedStream0(size_t* bitpointer, unsigned char* bitstream, unsigned char bit)
+{
+  /*the current bit in bitstream must be 0 for this to work*/
+  if(bit)
+  {
+    /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/
+    bitstream[(*bitpointer) >> 3] |= (bit << (7 - ((*bitpointer) & 0x7)));
+  }
+  (*bitpointer)++;
+}
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit)
+{
+  /*the current bit in bitstream may be 0 or 1 for this to work*/
+  if(bit == 0) bitstream[(*bitpointer) >> 3] &=  (unsigned char)(~(1 << (7 - ((*bitpointer) & 0x7))));
+  else         bitstream[(*bitpointer) >> 3] |=  (1 << (7 - ((*bitpointer) & 0x7)));
+  (*bitpointer)++;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / PNG chunks                                                             / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+unsigned lodepng_chunk_length(const unsigned char* chunk)
+{
+  return lodepng_read32bitInt(&chunk[0]);
+}
+
+void lodepng_chunk_type(char type[5], const unsigned char* chunk)
+{
+  unsigned i;
+  for(i = 0; i < 4; i++) type[i] = chunk[4 + i];
+  type[4] = 0; /*null termination char*/
+}
+
+unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type)
+{
+  if(strlen(type) != 4) return 0;
+  return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]);
+}
+
+unsigned char lodepng_chunk_ancillary(const unsigned char* chunk)
+{
+  return((chunk[4] & 32) != 0);
+}
+
+unsigned char lodepng_chunk_private(const unsigned char* chunk)
+{
+  return((chunk[6] & 32) != 0);
+}
+
+unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk)
+{
+  return((chunk[7] & 32) != 0);
+}
+
+unsigned char* lodepng_chunk_data(unsigned char* chunk)
+{
+  return &chunk[8];
+}
+
+const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk)
+{
+  return &chunk[8];
+}
+
+unsigned lodepng_chunk_check_crc(const unsigned char* chunk)
+{
+  unsigned length = lodepng_chunk_length(chunk);
+  unsigned CRC = lodepng_read32bitInt(&chunk[length + 8]);
+  /*the CRC is taken of the data and the 4 chunk type letters, not the length*/
+  unsigned checksum = lodepng_crc32(&chunk[4], length + 4);
+  if(CRC != checksum) return 1;
+  else return 0;
+}
+
+void lodepng_chunk_generate_crc(unsigned char* chunk)
+{
+  unsigned length = lodepng_chunk_length(chunk);
+  unsigned CRC = lodepng_crc32(&chunk[4], length + 4);
+  lodepng_set32bitInt(chunk + 8 + length, CRC);
+}
+
+unsigned char* lodepng_chunk_next(unsigned char* chunk)
+{
+  unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12;
+  return &chunk[total_chunk_length];
+}
+
+const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk)
+{
+  unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12;
+  return &chunk[total_chunk_length];
+}
+
+unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk)
+{
+  unsigned i;
+  unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12;
+  unsigned char *chunk_start, *new_buffer;
+  size_t new_length = (*outlength) + total_chunk_length;
+  if(new_length < total_chunk_length || new_length < (*outlength)) return 77; /*integer overflow happened*/
+
+  new_buffer = (unsigned char*)myrealloc(*out, new_length);
+  if(!new_buffer) return 83; /*alloc fail*/
+  (*out) = new_buffer;
+  (*outlength) = new_length;
+  chunk_start = &(*out)[new_length - total_chunk_length];
+
+  for(i = 0; i < total_chunk_length; i++) chunk_start[i] = chunk[i];
+
+  return 0;
+}
+
+unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length,
+                              const char* type, const unsigned char* data)
+{
+  unsigned i;
+  unsigned char *chunk, *new_buffer;
+  size_t new_length = (*outlength) + length + 12;
+  if(new_length < length + 12 || new_length < (*outlength)) return 77; /*integer overflow happened*/
+  new_buffer = (unsigned char*)myrealloc(*out, new_length);
+  if(!new_buffer) return 83; /*alloc fail*/
+  (*out) = new_buffer;
+  (*outlength) = new_length;
+  chunk = &(*out)[(*outlength) - length - 12];
+
+  /*1: length*/
+  lodepng_set32bitInt(chunk, (unsigned)length);
+
+  /*2: chunk name (4 letters)*/
+  chunk[4] = type[0];
+  chunk[5] = type[1];
+  chunk[6] = type[2];
+  chunk[7] = type[3];
+
+  /*3: the data*/
+  for(i = 0; i < length; i++) chunk[8 + i] = data[i];
+
+  /*4: CRC (of the chunkname characters and the data)*/
+  lodepng_chunk_generate_crc(chunk);
+
+  return 0;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Color types and such                                                   / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*return type is a LodePNG error code*/
+static unsigned checkColorValidity(LodePNGColorType colortype, unsigned bd) /*bd = bitdepth*/
+{
+  switch(colortype)
+  {
+    case 0: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; /*grey*/
+    case 2: if(!(                                 bd == 8 || bd == 16)) return 37; break; /*RGB*/
+    case 3: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8            )) return 37; break; /*palette*/
+    case 4: if(!(                                 bd == 8 || bd == 16)) return 37; break; /*grey + alpha*/
+    case 6: if(!(                                 bd == 8 || bd == 16)) return 37; break; /*RGBA*/
+    default: return 31;
+  }
+  return 0; /*allowed color type / bits combination*/
+}
+
+static unsigned getNumColorChannels(LodePNGColorType colortype)
+{
+  switch(colortype)
+  {
+    case 0: return 1; /*grey*/
+    case 2: return 3; /*RGB*/
+    case 3: return 1; /*palette*/
+    case 4: return 2; /*grey + alpha*/
+    case 6: return 4; /*RGBA*/
+  }
+  return 0; /*unexisting color type*/
+}
+
+static unsigned lodepng_get_bpp_lct(LodePNGColorType colortype, unsigned bitdepth)
+{
+  /*bits per pixel is amount of channels * bits per channel*/
+  return getNumColorChannels(colortype) * bitdepth;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+void lodepng_color_mode_init(LodePNGColorMode* info)
+{
+  info->key_defined = 0;
+  info->key_r = info->key_g = info->key_b = 0;
+  info->colortype = LCT_RGBA;
+  info->bitdepth = 8;
+  info->palette = 0;
+  info->palettesize = 0;
+}
+
+void lodepng_color_mode_cleanup(LodePNGColorMode* info)
+{
+  lodepng_palette_clear(info);
+}
+
+unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source)
+{
+  size_t i;
+  lodepng_color_mode_cleanup(dest);
+  *dest = *source;
+  if(source->palette)
+  {
+    dest->palette = (unsigned char*)mymalloc(source->palettesize * 4);
+    if(!dest->palette && source->palettesize) return 83; /*alloc fail*/
+    for(i = 0; i < source->palettesize * 4; i++) dest->palette[i] = source->palette[i];
+  }
+  return 0;
+}
+
+static int lodepng_color_mode_equal(const LodePNGColorMode* a, const LodePNGColorMode* b)
+{
+  size_t i;
+  if(a->colortype != b->colortype) return 0;
+  if(a->bitdepth != b->bitdepth) return 0;
+  if(a->key_defined != b->key_defined) return 0;
+  if(a->key_defined)
+  {
+    if(a->key_r != b->key_r) return 0;
+    if(a->key_g != b->key_g) return 0;
+    if(a->key_b != b->key_b) return 0;
+  }
+  if(a->palettesize != b->palettesize) return 0;
+  for(i = 0; i < a->palettesize * 4; i++)
+  {
+    if(a->palette[i] != b->palette[i]) return 0;
+  }
+  return 1;
+}
+
+void lodepng_palette_clear(LodePNGColorMode* info)
+{
+  if(info->palette) myfree(info->palette);
+  info->palettesize = 0;
+}
+
+unsigned lodepng_palette_add(LodePNGColorMode* info,
+                             unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+  unsigned char* data;
+  /*the same resize technique as C++ std::vectors is used, and here it's made so that for a palette with
+  the max of 256 colors, it'll have the exact alloc size*/
+  if(!(info->palettesize & (info->palettesize - 1))) /*if palettesize is 0 or a power of two*/
+  {
+    /*allocated data must be at least 4* palettesize (for 4 color bytes)*/
+    size_t alloc_size = info->palettesize == 0 ? 4 : info->palettesize * 4 * 2;
+    data = (unsigned char*)myrealloc(info->palette, alloc_size);
+    if(!data) return 83; /*alloc fail*/
+    else info->palette = data;
+  }
+  info->palette[4 * info->palettesize + 0] = r;
+  info->palette[4 * info->palettesize + 1] = g;
+  info->palette[4 * info->palettesize + 2] = b;
+  info->palette[4 * info->palettesize + 3] = a;
+  info->palettesize++;
+  return 0;
+}
+
+unsigned lodepng_get_bpp(const LodePNGColorMode* info)
+{
+  /*calculate bits per pixel out of colortype and bitdepth*/
+  return lodepng_get_bpp_lct(info->colortype, info->bitdepth);
+}
+
+unsigned lodepng_get_channels(const LodePNGColorMode* info)
+{
+  return getNumColorChannels(info->colortype);
+}
+
+unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info)
+{
+  return info->colortype == LCT_GREY || info->colortype == LCT_GREY_ALPHA;
+}
+
+unsigned lodepng_is_alpha_type(const LodePNGColorMode* info)
+{
+  return (info->colortype & 4) != 0; /*4 or 6*/
+}
+
+unsigned lodepng_is_palette_type(const LodePNGColorMode* info)
+{
+  return info->colortype == LCT_PALETTE;
+}
+
+unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info)
+{
+  size_t i;
+  for(i = 0; i < info->palettesize; i++)
+  {
+    if(info->palette[i * 4 + 3] < 255) return 1;
+  }
+  return 0;
+}
+
+unsigned lodepng_can_have_alpha(const LodePNGColorMode* info)
+{
+  return info->key_defined
+      || lodepng_is_alpha_type(info)
+      || lodepng_has_palette_alpha(info);
+}
+
+size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color)
+{
+  return (w * h * lodepng_get_bpp(color) + 7) / 8;
+}
+
+size_t lodepng_get_raw_size_lct(unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth)
+{
+  return (w * h * lodepng_get_bpp_lct(colortype, bitdepth) + 7) / 8;
+}
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+
+static void LodePNGUnknownChunks_init(LodePNGInfo* info)
+{
+  unsigned i;
+  for(i = 0; i < 3; i++) info->unknown_chunks_data[i] = 0;
+  for(i = 0; i < 3; i++) info->unknown_chunks_size[i] = 0;
+}
+
+static void LodePNGUnknownChunks_cleanup(LodePNGInfo* info)
+{
+  unsigned i;
+  for(i = 0; i < 3; i++) myfree(info->unknown_chunks_data[i]);
+}
+
+static unsigned LodePNGUnknownChunks_copy(LodePNGInfo* dest, const LodePNGInfo* src)
+{
+  unsigned i;
+
+  LodePNGUnknownChunks_cleanup(dest);
+
+  for(i = 0; i < 3; i++)
+  {
+    size_t j;
+    dest->unknown_chunks_size[i] = src->unknown_chunks_size[i];
+    dest->unknown_chunks_data[i] = (unsigned char*)mymalloc(src->unknown_chunks_size[i]);
+    if(!dest->unknown_chunks_data[i] && dest->unknown_chunks_size[i]) return 83; /*alloc fail*/
+    for(j = 0; j < src->unknown_chunks_size[i]; j++)
+    {
+      dest->unknown_chunks_data[i][j] = src->unknown_chunks_data[i][j];
+    }
+  }
+
+  return 0;
+}
+
+/******************************************************************************/
+
+static void LodePNGText_init(LodePNGInfo* info)
+{
+  info->text_num = 0;
+  info->text_keys = NULL;
+  info->text_strings = NULL;
+}
+
+static void LodePNGText_cleanup(LodePNGInfo* info)
+{
+  size_t i;
+  for(i = 0; i < info->text_num; i++)
+  {
+    string_cleanup(&info->text_keys[i]);
+    string_cleanup(&info->text_strings[i]);
+  }
+  myfree(info->text_keys);
+  myfree(info->text_strings);
+}
+
+static unsigned LodePNGText_copy(LodePNGInfo* dest, const LodePNGInfo* source)
+{
+  size_t i = 0;
+  dest->text_keys = 0;
+  dest->text_strings = 0;
+  dest->text_num = 0;
+  for(i = 0; i < source->text_num; i++)
+  {
+    CERROR_TRY_RETURN(lodepng_add_text(dest, source->text_keys[i], source->text_strings[i]));
+  }
+  return 0;
+}
+
+void lodepng_clear_text(LodePNGInfo* info)
+{
+  LodePNGText_cleanup(info);
+}
+
+unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str)
+{
+  char** new_keys = (char**)(myrealloc(info->text_keys, sizeof(char*) * (info->text_num + 1)));
+  char** new_strings = (char**)(myrealloc(info->text_strings, sizeof(char*) * (info->text_num + 1)));
+  if(!new_keys || !new_strings)
+  {
+    myfree(new_keys);
+    myfree(new_strings);
+    return 83; /*alloc fail*/
+  }
+
+  info->text_num++;
+  info->text_keys = new_keys;
+  info->text_strings = new_strings;
+
+  string_init(&info->text_keys[info->text_num - 1]);
+  string_set(&info->text_keys[info->text_num - 1], key);
+
+  string_init(&info->text_strings[info->text_num - 1]);
+  string_set(&info->text_strings[info->text_num - 1], str);
+
+  return 0;
+}
+
+/******************************************************************************/
+
+static void LodePNGIText_init(LodePNGInfo* info)
+{
+  info->itext_num = 0;
+  info->itext_keys = NULL;
+  info->itext_langtags = NULL;
+  info->itext_transkeys = NULL;
+  info->itext_strings = NULL;
+}
+
+static void LodePNGIText_cleanup(LodePNGInfo* info)
+{
+  size_t i;
+  for(i = 0; i < info->itext_num; i++)
+  {
+    string_cleanup(&info->itext_keys[i]);
+    string_cleanup(&info->itext_langtags[i]);
+    string_cleanup(&info->itext_transkeys[i]);
+    string_cleanup(&info->itext_strings[i]);
+  }
+  myfree(info->itext_keys);
+  myfree(info->itext_langtags);
+  myfree(info->itext_transkeys);
+  myfree(info->itext_strings);
+}
+
+static unsigned LodePNGIText_copy(LodePNGInfo* dest, const LodePNGInfo* source)
+{
+  size_t i = 0;
+  dest->itext_keys = 0;
+  dest->itext_langtags = 0;
+  dest->itext_transkeys = 0;
+  dest->itext_strings = 0;
+  dest->itext_num = 0;
+  for(i = 0; i < source->itext_num; i++)
+  {
+    CERROR_TRY_RETURN(lodepng_add_itext(dest, source->itext_keys[i], source->itext_langtags[i],
+                                        source->itext_transkeys[i], source->itext_strings[i]));
+  }
+  return 0;
+}
+
+void lodepng_clear_itext(LodePNGInfo* info)
+{
+  LodePNGIText_cleanup(info);
+}
+
+unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag,
+                           const char* transkey, const char* str)
+{
+  char** new_keys = (char**)(myrealloc(info->itext_keys, sizeof(char*) * (info->itext_num + 1)));
+  char** new_langtags = (char**)(myrealloc(info->itext_langtags, sizeof(char*) * (info->itext_num + 1)));
+  char** new_transkeys = (char**)(myrealloc(info->itext_transkeys, sizeof(char*) * (info->itext_num + 1)));
+  char** new_strings = (char**)(myrealloc(info->itext_strings, sizeof(char*) * (info->itext_num + 1)));
+  if(!new_keys || !new_langtags || !new_transkeys || !new_strings)
+  {
+    myfree(new_keys);
+    myfree(new_langtags);
+    myfree(new_transkeys);
+    myfree(new_strings);
+    return 83; /*alloc fail*/
+  }
+
+  info->itext_num++;
+  info->itext_keys = new_keys;
+  info->itext_langtags = new_langtags;
+  info->itext_transkeys = new_transkeys;
+  info->itext_strings = new_strings;
+
+  string_init(&info->itext_keys[info->itext_num - 1]);
+  string_set(&info->itext_keys[info->itext_num - 1], key);
+
+  string_init(&info->itext_langtags[info->itext_num - 1]);
+  string_set(&info->itext_langtags[info->itext_num - 1], langtag);
+
+  string_init(&info->itext_transkeys[info->itext_num - 1]);
+  string_set(&info->itext_transkeys[info->itext_num - 1], transkey);
+
+  string_init(&info->itext_strings[info->itext_num - 1]);
+  string_set(&info->itext_strings[info->itext_num - 1], str);
+
+  return 0;
+}
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+void lodepng_info_init(LodePNGInfo* info)
+{
+  lodepng_color_mode_init(&info->color);
+  info->interlace_method = 0;
+  info->compression_method = 0;
+  info->filter_method = 0;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  info->background_defined = 0;
+  info->background_r = info->background_g = info->background_b = 0;
+
+  LodePNGText_init(info);
+  LodePNGIText_init(info);
+
+  info->time_defined = 0;
+  info->phys_defined = 0;
+
+  LodePNGUnknownChunks_init(info);
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+}
+
+void lodepng_info_cleanup(LodePNGInfo* info)
+{
+  lodepng_color_mode_cleanup(&info->color);
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  LodePNGText_cleanup(info);
+  LodePNGIText_cleanup(info);
+
+  LodePNGUnknownChunks_cleanup(info);
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+}
+
+unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source)
+{
+  lodepng_info_cleanup(dest);
+  *dest = *source;
+  lodepng_color_mode_init(&dest->color);
+  CERROR_TRY_RETURN(lodepng_color_mode_copy(&dest->color, &source->color));
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  CERROR_TRY_RETURN(LodePNGText_copy(dest, source));
+  CERROR_TRY_RETURN(LodePNGIText_copy(dest, source));
+
+  LodePNGUnknownChunks_init(dest);
+  CERROR_TRY_RETURN(LodePNGUnknownChunks_copy(dest, source));
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+  return 0;
+}
+
+void lodepng_info_swap(LodePNGInfo* a, LodePNGInfo* b)
+{
+  LodePNGInfo temp = *a;
+  *a = *b;
+  *b = temp;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*index: bitgroup index, bits: bitgroup size(1, 2 or 4, in: bitgroup value, out: octet array to add bits to*/
+static void addColorBits(unsigned char* out, size_t index, unsigned bits, unsigned in)
+{
+  /*p = the partial index in the byte, e.g. with 4 palettebits it is 0 for first half or 1 for second half*/
+  unsigned p = index % (8 / bits);
+  in &= (1 << bits) - 1; /*filter out any other bits of the input value*/
+  in = in << (bits * (8 / bits - p - 1));
+  if(p == 0) out[index * bits / 8] = in;
+  else out[index * bits / 8] |= in;
+}
+
+typedef struct ColorTree ColorTree;
+
+/*
+One node of a color tree
+This is the data structure used to count the number of unique colors and to get a palette
+index for a color. It's a bit like an octree for RGB bits, except that a node has 256
+children and there is one level of the tree per color channel. This may use more memory
+than an octree, but this is only used to count up to 256 so it's good enough.
+*/
+struct ColorTree
+{
+  ColorTree* next; /*null, or array of 256 pointers to ColorTree of next level*/
+  int index; /*the payload. Only has a meaningful value if this is in the 4th level*/
+};
+
+static void color_tree_make_next(ColorTree* tree);
+
+/*next: whether to create the next array or not*/
+static void color_tree_init(ColorTree* tree, int next)
+{
+  if(next) color_tree_make_next(tree);
+  else tree->next = 0;
+  tree->index = -1;
+}
+
+static void color_tree_make_next(ColorTree* tree)
+{
+  int i;
+  tree->next = (ColorTree*)mymalloc(256 * sizeof(ColorTree));
+  for(i = 0; i < 256; i++) color_tree_init(&tree->next[i], 0);
+}
+
+static void color_tree_cleanup(ColorTree* tree)
+{
+  if(tree->next)
+  {
+    int i;
+    for(i = 0; i < 256; i++) color_tree_cleanup(&tree->next[i]);
+    myfree(tree->next);
+  }
+}
+
+/*returns -1 if color not present, its index otherwise*/
+static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+  tree = &tree->next[r];
+  if(tree->next == 0) return -1;
+  tree = &tree->next[g];
+  if(tree->next == 0) return -1;
+  tree = &tree->next[b];
+  if(tree->next == 0) return -1;
+  tree = &tree->next[a];
+
+  return tree->index;
+}
+
+#ifdef LODEPNG_COMPILE_ENCODER
+static int color_tree_has(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+  return color_tree_get(tree, r, g, b, a) >= 0;
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/*color is not allowed to already exist. Index should be >= 0 (it's signed to be compatible with using -1 for "doesn't exist")*/
+static void color_tree_add(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a, int index)
+{
+  tree = &tree->next[r];
+  if(tree->next == 0) color_tree_make_next(tree);
+  tree = &tree->next[g];
+  if(tree->next == 0) color_tree_make_next(tree);
+  tree = &tree->next[b];
+  if(tree->next == 0) color_tree_make_next(tree);
+  tree = &tree->next[a];
+
+  tree->index = index;
+}
+
+/*put a pixel, given its RGBA color, into image of any color type*/
+static unsigned rgba8ToPixel(unsigned char* out, size_t i,
+                             const LodePNGColorMode* mode, ColorTree* tree /*for palette*/,
+                             unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+  if(mode->colortype == LCT_GREY)
+  {
+    unsigned char grey = r; /*((unsigned short)r + g + b) / 3*/;
+    if(mode->bitdepth == 8) out[i] = grey;
+    else if(mode->bitdepth == 16) out[i * 2 + 0] = out[i * 2 + 1] = grey;
+    else
+    {
+      /*take the most significant bits of grey*/
+      grey = (grey >> (8 - mode->bitdepth)) & ((1 << mode->bitdepth) - 1);
+      addColorBits(out, i, mode->bitdepth, grey);
+    }
+  }
+  else if(mode->colortype == LCT_RGB)
+  {
+    if(mode->bitdepth == 8)
+    {
+      out[i * 3 + 0] = r;
+      out[i * 3 + 1] = g;
+      out[i * 3 + 2] = b;
+    }
+    else
+    {
+      out[i * 6 + 0] = out[i * 6 + 1] = r;
+      out[i * 6 + 2] = out[i * 6 + 3] = g;
+      out[i * 6 + 4] = out[i * 6 + 5] = b;
+    }
+  }
+  else if(mode->colortype == LCT_PALETTE)
+  {
+    int index = color_tree_get(tree, r, g, b, a);
+    if(index < 0) return 82; /*color not in palette*/
+    if(mode->bitdepth == 8) out[i] = index;
+    else addColorBits(out, i, mode->bitdepth, index);
+  }
+  else if(mode->colortype == LCT_GREY_ALPHA)
+  {
+    unsigned char grey = r; /*((unsigned short)r + g + b) / 3*/;
+    if(mode->bitdepth == 8)
+    {
+      out[i * 2 + 0] = grey;
+      out[i * 2 + 1] = a;
+    }
+    else if(mode->bitdepth == 16)
+    {
+      out[i * 4 + 0] = out[i * 4 + 1] = grey;
+      out[i * 4 + 2] = out[i * 4 + 3] = a;
+    }
+  }
+  else if(mode->colortype == LCT_RGBA)
+  {
+    if(mode->bitdepth == 8)
+    {
+      out[i * 4 + 0] = r;
+      out[i * 4 + 1] = g;
+      out[i * 4 + 2] = b;
+      out[i * 4 + 3] = a;
+    }
+    else
+    {
+      out[i * 8 + 0] = out[i * 8 + 1] = r;
+      out[i * 8 + 2] = out[i * 8 + 3] = g;
+      out[i * 8 + 4] = out[i * 8 + 5] = b;
+      out[i * 8 + 6] = out[i * 8 + 7] = a;
+    }
+  }
+
+  return 0; /*no error*/
+}
+
+/*put a pixel, given its RGBA16 color, into image of any color 16-bitdepth type*/
+static unsigned rgba16ToPixel(unsigned char* out, size_t i,
+                              const LodePNGColorMode* mode,
+                              unsigned short r, unsigned short g, unsigned short b, unsigned short a)
+{
+  if(mode->bitdepth != 16) return 85; /*must be 16 for this function*/
+  if(mode->colortype == LCT_GREY)
+  {
+    unsigned short grey = r; /*((unsigned)r + g + b) / 3*/;
+    out[i * 2 + 0] = (grey >> 8) & 255;
+    out[i * 2 + 1] = grey & 255;
+  }
+  else if(mode->colortype == LCT_RGB)
+  {
+    out[i * 6 + 0] = (r >> 8) & 255;
+    out[i * 6 + 1] = r & 255;
+    out[i * 6 + 2] = (g >> 8) & 255;
+    out[i * 6 + 3] = g & 255;
+    out[i * 6 + 4] = (b >> 8) & 255;
+    out[i * 6 + 5] = b & 255;
+  }
+  else if(mode->colortype == LCT_GREY_ALPHA)
+  {
+    unsigned short grey = r; /*((unsigned)r + g + b) / 3*/;
+    out[i * 4 + 0] = (grey >> 8) & 255;
+    out[i * 4 + 1] = grey & 255;
+    out[i * 4 + 2] = (a >> 8) & 255;
+    out[i * 4 + 3] = a & 255;
+  }
+  else if(mode->colortype == LCT_RGBA)
+  {
+    out[i * 8 + 0] = (r >> 8) & 255;
+    out[i * 8 + 1] = r & 255;
+    out[i * 8 + 2] = (g >> 8) & 255;
+    out[i * 8 + 3] = g & 255;
+    out[i * 8 + 4] = (b >> 8) & 255;
+    out[i * 8 + 5] = b & 255;
+    out[i * 8 + 6] = (a >> 8) & 255;
+    out[i * 8 + 7] = a & 255;
+  }
+
+  return 0; /*no error*/
+}
+
+/*Get RGBA8 color of pixel with index i (y * width + x) from the raw image with given color type.*/
+static unsigned getPixelColorRGBA8(unsigned char* r, unsigned char* g, unsigned char* b, unsigned char* a,
+                                   const unsigned char* in, size_t i, const LodePNGColorMode* mode)
+{
+  if(mode->colortype == LCT_GREY)
+  {
+    if(mode->bitdepth == 8)
+    {
+      *r = *g = *b = in[i];
+      if(mode->key_defined && *r == mode->key_r) *a = 0;
+      else *a = 255;
+    }
+    else if(mode->bitdepth == 16)
+    {
+      *r = *g = *b = in[i * 2 + 0];
+      if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0;
+      else *a = 255;
+    }
+    else
+    {
+      unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/
+      size_t j = i * mode->bitdepth;
+      unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth);
+      *r = *g = *b = (value * 255) / highest;
+      if(mode->key_defined && value == mode->key_r) *a = 0;
+      else *a = 255;
+    }
+  }
+  else if(mode->colortype == LCT_RGB)
+  {
+    if(mode->bitdepth == 8)
+    {
+      *r = in[i * 3 + 0]; *g = in[i * 3 + 1]; *b = in[i * 3 + 2];
+      if(mode->key_defined && *r == mode->key_r && *g == mode->key_g && *b == mode->key_b) *a = 0;
+      else *a = 255;
+    }
+    else
+    {
+      *r = in[i * 6 + 0];
+      *g = in[i * 6 + 2];
+      *b = in[i * 6 + 4];
+      if(mode->key_defined && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r
+         && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g
+         && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0;
+      else *a = 255;
+    }
+  }
+  else if(mode->colortype == LCT_PALETTE)
+  {
+    unsigned index;
+    if(mode->bitdepth == 8) index = in[i];
+    else
+    {
+      size_t j = i * mode->bitdepth;
+      index = readBitsFromReversedStream(&j, in, mode->bitdepth);
+    }
+    if(index >= mode->palettesize) return 47; /*index out of palette*/
+    *r = mode->palette[index * 4 + 0];
+    *g = mode->palette[index * 4 + 1];
+    *b = mode->palette[index * 4 + 2];
+    *a = mode->palette[index * 4 + 3];
+  }
+  else if(mode->colortype == LCT_GREY_ALPHA)
+  {
+    if(mode->bitdepth == 8)
+    {
+      *r = *g = *b = in[i * 2 + 0];
+      *a = in[i * 2 + 1];
+    }
+    else
+    {
+      *r = *g = *b = in[i * 4 + 0];
+      *a = in[i * 4 + 2];
+    }
+  }
+  else if(mode->colortype == LCT_RGBA)
+  {
+    if(mode->bitdepth == 8)
+    {
+      *r = in[i * 4 + 0]; *g = in[i * 4 + 1]; *b = in[i * 4 + 2]; *a = in[i * 4 + 3];
+    }
+    else
+    {
+      *r = in[i * 8 + 0]; *g = in[i * 8 + 2]; *b = in[i * 8 + 4]; *a = in[i * 8 + 6];
+    }
+  }
+
+  return 0; /*no error*/
+}
+
+/*Get RGBA16 color of pixel with index i (y * width + x) from the raw image with
+given color type, but the given color type must be 16-bit itself.*/
+static unsigned getPixelColorRGBA16(unsigned short* r, unsigned short* g, unsigned short* b, unsigned short* a,
+                                    const unsigned char* in, size_t i, const LodePNGColorMode* mode)
+{
+  if(mode->bitdepth != 16) return 85; /*error: this function only supports 16-bit input*/
+
+  if(mode->colortype == LCT_GREY)
+  {
+    *r = *g = *b = 256 * in[i * 2 + 0] + in[i * 2 + 1];
+    if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0;
+    else *a = 65535;
+  }
+  else if(mode->colortype == LCT_RGB)
+  {
+    *r = 256 * in[i * 6 + 0] + in[i * 6 + 1];
+    *g = 256 * in[i * 6 + 2] + in[i * 6 + 3];
+    *b = 256 * in[i * 6 + 4] + in[i * 6 + 5];
+    if(mode->key_defined && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r
+       && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g
+       && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0;
+    else *a = 65535;
+  }
+  else if(mode->colortype == LCT_GREY_ALPHA)
+  {
+    *r = *g = *b = 256 * in[i * 4 + 0] + in[i * 4 + 1];
+    *a = 256 * in[i * 4 + 2] + in[i * 4 + 3];
+  }
+  else if(mode->colortype == LCT_RGBA)
+  {
+    *r = 256 * in[i * 8 + 0] + in[i * 8 + 1];
+    *g = 256 * in[i * 8 + 2] + in[i * 8 + 3];
+    *b = 256 * in[i * 8 + 4] + in[i * 8 + 5];
+    *a = 256 * in[i * 8 + 6] + in[i * 8 + 7];
+  }
+  else return 85; /*error: this function only supports 16-bit input*/
+
+  return 0; /*no error*/
+}
+
+/*
+converts from any color type to 24-bit or 32-bit (later maybe more supported). return value = LodePNG error code
+the out buffer must have (w * h * bpp + 7) / 8 bytes, where bpp is the bits per pixel of the output color type
+(lodepng_get_bpp) for < 8 bpp images, there may _not_ be padding bits at the end of scanlines.
+*/
+unsigned lodepng_convert(unsigned char* out, const unsigned char* in,
+                         LodePNGColorMode* mode_out, LodePNGColorMode* mode_in,
+                         unsigned w, unsigned h)
+{
+  unsigned error = 0;
+  size_t i;
+  ColorTree tree;
+
+  if(lodepng_color_mode_equal(mode_out, mode_in))
+  {
+    size_t numbytes = lodepng_get_raw_size(w, h, mode_in);
+    for(i = 0; i < numbytes; i++) out[i] = in[i];
+    return error;
+  }
+
+  if(mode_out->colortype == LCT_PALETTE)
+  {
+    size_t palsize = 1 << mode_out->bitdepth;
+    if(mode_out->palettesize < palsize) palsize = mode_out->palettesize;
+    color_tree_init(&tree, 1);
+    for(i = 0; i < palsize; i++)
+    {
+      unsigned char* p = &mode_out->palette[i * 4];
+      color_tree_add(&tree, p[0], p[1], p[2], p[3], i);
+    }
+  }
+
+  if(mode_in->bitdepth == 16 && mode_out->bitdepth == 16)
+  {
+    size_t numpixels = w * h;
+    for(i = 0; i < numpixels; i++)
+    {
+      unsigned short r = 0, g = 0, b = 0, a = 0;
+      error = getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in);
+      if(error) return error;
+      error = rgba16ToPixel(out, i, mode_out, r, g, b, a);
+      if(error) return error;
+    }
+  }
+  else
+  {
+    size_t numpixels = w * h;
+    for(i = 0; i < numpixels; i++)
+    {
+      unsigned char r = 0, g = 0, b = 0, a = 0;
+      error = getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in);
+      if(error) return error;
+      error = rgba8ToPixel(out, i, mode_out, &tree, r, g, b, a);
+      if(error) return error;
+    }
+  }
+
+  if(mode_out->colortype == LCT_PALETTE)
+  {
+    color_tree_cleanup(&tree);
+  }
+
+  return error;
+}
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+typedef struct ColorProfile
+{
+  unsigned char sixteenbit; /*needs more than 8 bits per channel*/
+  unsigned char sixteenbit_done;
+
+
+  unsigned char colored; /*not greyscale*/
+  unsigned char colored_done;
+
+  unsigned char key; /*a color key is required, or more*/
+  unsigned short key_r; /*these values are always in 16-bit bitdepth in the profile*/
+  unsigned short key_g;
+  unsigned short key_b;
+  unsigned char alpha; /*alpha channel, or alpha palette, required*/
+  unsigned char alpha_done;
+
+  unsigned numcolors;
+  ColorTree tree; /*for listing the counted colors, up to 256*/
+  unsigned char* palette; /*size 1024. Remember up to the first 256 RGBA colors*/
+  unsigned maxnumcolors; /*if more than that amount counted*/
+  unsigned char numcolors_done;
+
+  unsigned greybits; /*amount of bits required for greyscale (1, 2, 4, 8). Does not take 16 bit into account.*/
+  unsigned char greybits_done;
+
+} ColorProfile;
+
+static void color_profile_init(ColorProfile* profile, LodePNGColorMode* mode)
+{
+  profile->sixteenbit = 0;
+  profile->sixteenbit_done = mode->bitdepth == 16 ? 0 : 1;
+
+  profile->colored = 0;
+  profile->colored_done = lodepng_is_greyscale_type(mode) ? 1 : 0;
+
+  profile->key = 0;
+  profile->alpha = 0;
+  profile->alpha_done = lodepng_can_have_alpha(mode) ? 0 : 1;
+
+  profile->numcolors = 0;
+  color_tree_init(&profile->tree, 1);
+  profile->palette = (unsigned char*)mymalloc(1024);
+  profile->maxnumcolors = 257;
+  if(lodepng_get_bpp(mode) <= 8)
+  {
+    int bpp = lodepng_get_bpp(mode);
+    profile->maxnumcolors = bpp == 1 ? 2 : (bpp == 2 ? 4 : (bpp == 4 ? 16 : 256));
+  }
+  profile->numcolors_done = 0;
+
+  profile->greybits = 1;
+  profile->greybits_done = lodepng_get_bpp(mode) == 1 ? 1 : 0;
+}
+
+static void color_profile_cleanup(ColorProfile* profile)
+{
+  color_tree_cleanup(&profile->tree);
+  myfree(profile->palette);
+}
+
+/*function used for debug purposes with C++*/
+/*void printColorProfile(ColorProfile* p)
+{
+  std::cout << "sixteenbit: " << (int)p->sixteenbit << std::endl;
+  std::cout << "sixteenbit_done: " << (int)p->sixteenbit_done << std::endl;
+  std::cout << "colored: " << (int)p->colored << std::endl;
+  std::cout << "colored_done: " << (int)p->colored_done << std::endl;
+  std::cout << "key: " << (int)p->key << std::endl;
+  std::cout << "key_r: " << (int)p->key_r << std::endl;
+  std::cout << "key_g: " << (int)p->key_g << std::endl;
+  std::cout << "key_b: " << (int)p->key_b << std::endl;
+  std::cout << "alpha: " << (int)p->alpha << std::endl;
+  std::cout << "alpha_done: " << (int)p->alpha_done << std::endl;
+  std::cout << "numcolors: " << (int)p->numcolors << std::endl;
+  std::cout << "maxnumcolors: " << (int)p->maxnumcolors << std::endl;
+  std::cout << "numcolors_done: " << (int)p->numcolors_done << std::endl;
+  std::cout << "greybits: " << (int)p->greybits << std::endl;
+  std::cout << "greybits_done: " << (int)p->greybits_done << std::endl;
+}*/
+
+/*Returns how many bits needed to represent given value (max 8 bit)*/
+unsigned getValueRequiredBits(unsigned char value)
+{
+  if(value == 0 || value == 255) return 1;
+  /*The scaling of 2-bit and 4-bit values uses multiples of 85 and 17*/
+  if(value % 17 == 0) return value % 85 == 0 ? 2 : 4;
+  return 8;
+}
+
+/*profile must already have been inited with mode.
+It's ok to set some parameters of profile to done already.*/
+static unsigned get_color_profile(ColorProfile* profile,
+                                  const unsigned char* in, size_t numpixels,
+                                  LodePNGColorMode* mode)
+{
+  unsigned error = 0;
+  size_t i;
+
+  if(mode->bitdepth == 16)
+  {
+    for(i = 0; i < numpixels; i++)
+    {
+      unsigned short r, g, b, a;
+      error = getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode);
+      if(error) break;
+
+      /*a color is considered good for 8-bit if the first byte and the second byte are equal,
+        (so if it's divisible through 257), NOT necessarily if the second byte is 0*/
+      if(!profile->sixteenbit_done
+          && (((r & 255) != ((r >> 8) & 255))
+           || ((g & 255) != ((g >> 8) & 255))
+           || ((b & 255) != ((b >> 8) & 255))))
+      {
+        profile->sixteenbit = 1;
+        profile->sixteenbit_done = 1;
+        profile->greybits_done = 1; /*greybits is not applicable anymore at 16-bit*/
+        profile->numcolors_done = 1; /*counting colors no longer useful, palette doesn't support 16-bit*/
+      }
+
+      if(!profile->colored_done && (r != g || r != b))
+      {
+        profile->colored = 1;
+        profile->colored_done = 1;
+        profile->greybits_done = 1; /*greybits is not applicable anymore*/
+      }
+
+      if(!profile->alpha_done && a != 255)
+      {
+        if(a == 0 && !(profile->key && (r != profile->key_r || g != profile->key_g || b != profile->key_b)))
+        {
+          if(!profile->key)
+          {
+            profile->key = 1;
+            profile->key_r = r;
+            profile->key_g = g;
+            profile->key_b = b;
+          }
+        }
+        else
+        {
+          profile->alpha = 1;
+          profile->alpha_done = 1;
+          profile->greybits_done = 1; /*greybits is not applicable anymore*/
+        }
+      }
+
+      if(!profile->greybits_done)
+      {
+        /*assuming 8-bit r, this test does not care about 16-bit*/
+        unsigned bits = getValueRequiredBits(r);
+        if(bits > profile->greybits) profile->greybits = bits;
+        if(profile->greybits >= 8) profile->greybits_done = 1;
+      }
+
+      if(!profile->numcolors_done)
+      {
+        /*assuming 8-bit rgba, this test does not care about 16-bit*/
+        if(!color_tree_has(&profile->tree, r, g, b, a))
+        {
+          color_tree_add(&profile->tree, r, g, b, a, profile->numcolors);
+          if(profile->numcolors < 256)
+          {
+            unsigned char* p = profile->palette;
+            unsigned i = profile->numcolors;
+            p[i * 4 + 0] = r;
+            p[i * 4 + 1] = g;
+            p[i * 4 + 2] = b;
+            p[i * 4 + 3] = a;
+          }
+          profile->numcolors++;
+          if(profile->numcolors >= profile->maxnumcolors) profile->numcolors_done = 1;
+        }
+      }
+
+      if(profile->alpha_done && profile->numcolors_done
+      && profile->colored_done && profile->sixteenbit_done && profile->greybits_done)
+      {
+        break;
+      }
+    };
+  }
+  else
+  {
+    for(i = 0; i < numpixels; i++)
+    {
+      unsigned char r, g, b, a;
+      error = getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode);
+      if(error) break;
+
+      if(!profile->colored_done && (r != g || r != b))
+      {
+        profile->colored = 1;
+        profile->colored_done = 1;
+        profile->greybits_done = 1; /*greybits is not applicable anymore*/
+      }
+
+      if(!profile->alpha_done && a != 255)
+      {
+        if(a == 0 && !(profile->key && (r != profile->key_r || g != profile->key_g || b != profile->key_b)))
+        {
+          if(!profile->key)
+          {
+            profile->key = 1;
+            profile->key_r = r;
+            profile->key_g = g;
+            profile->key_b = b;
+          }
+        }
+        else
+        {
+          profile->alpha = 1;
+          profile->alpha_done = 1;
+          profile->greybits_done = 1; /*greybits is not applicable anymore*/
+        }
+      }
+
+      if(!profile->greybits_done)
+      {
+        unsigned bits = getValueRequiredBits(r);
+        if(bits > profile->greybits) profile->greybits = bits;
+        if(profile->greybits >= 8) profile->greybits_done = 1;
+      }
+
+      if(!profile->numcolors_done)
+      {
+        if(!color_tree_has(&profile->tree, r, g, b, a))
+        {
+
+          color_tree_add(&profile->tree, r, g, b, a, profile->numcolors);
+          if(profile->numcolors < 256)
+          {
+            unsigned char* p = profile->palette;
+            unsigned i = profile->numcolors;
+            p[i * 4 + 0] = r;
+            p[i * 4 + 1] = g;
+            p[i * 4 + 2] = b;
+            p[i * 4 + 3] = a;
+          }
+          profile->numcolors++;
+          if(profile->numcolors >= profile->maxnumcolors) profile->numcolors_done = 1;
+        }
+      }
+
+      if(profile->alpha_done && profile->numcolors_done && profile->colored_done && profile->greybits_done)
+      {
+        break;
+      }
+    };
+  }
+
+  /*make the profile's key always 16-bit for consistency*/
+  if(mode->bitdepth < 16)
+  {
+    /*repeat each byte twice*/
+    profile->key_r *= 257;
+    profile->key_g *= 257;
+    profile->key_b *= 257;
+  }
+
+  return error;
+}
+
+/*updates values of mode with a potentially smaller color model. mode_out should
+contain the user chosen color model, but will be overwritten with the new chosen one.*/
+static unsigned doAutoChooseColor(LodePNGColorMode* mode_out,
+                                  const unsigned char* image, unsigned w, unsigned h, LodePNGColorMode* mode_in,
+                                  LodePNGAutoConvert auto_convert)
+{
+  ColorProfile profile;
+  unsigned error = 0;
+
+  if(auto_convert == LAC_ALPHA)
+  {
+    if(mode_out->colortype != LCT_RGBA && mode_out->colortype != LCT_GREY_ALPHA) return 0;
+  }
+
+  color_profile_init(&profile, mode_in);
+  if(auto_convert == LAC_ALPHA)
+  {
+    profile.colored_done = 1;
+    profile.greybits_done = 1;
+    profile.numcolors_done = 1;
+    profile.sixteenbit_done = 1;
+  }
+  error = get_color_profile(&profile, image, w * h, mode_in);
+
+  if(!error && auto_convert == LAC_ALPHA)
+  {
+    if(!profile.alpha)
+    {
+      mode_out->colortype = (mode_out->colortype == LCT_RGBA ? LCT_RGB : LCT_GREY);
+    }
+  }
+  else if(!error && auto_convert != LAC_ALPHA)
+  {
+    mode_out->key_defined = 0;
+
+    if(profile.sixteenbit)
+    {
+      mode_out->bitdepth = 16;
+      if(profile.alpha)
+      {
+        mode_out->colortype = profile.colored ? LCT_RGBA : LCT_GREY_ALPHA;
+      }
+      else
+      {
+        mode_out->colortype = profile.colored ? LCT_RGB : LCT_GREY;
+        if(profile.key)
+        {
+          mode_out->key_defined = 1;
+          mode_out->key_r = profile.key_r;
+          mode_out->key_g = profile.key_g;
+          mode_out->key_b = profile.key_b;
+        }
+      }
+    }
+    else /*less than 16 bits per channel*/
+    {
+      /*don't add palette overhead if image hasn't got a lot of pixels*/
+      unsigned n = profile.numcolors;
+      int palette_ok = n <= 256 && (n * 2 < w * h);
+      unsigned palettebits = n <= 2 ? 1 : (n <= 4 ? 2 : (n <= 16 ? 4 : 8));
+      int grey_ok = !profile.colored && !profile.alpha; /*grey without alpha, with potentially low bits*/
+      if(palette_ok || grey_ok)
+      {
+        if(!palette_ok || (grey_ok && profile.greybits <= palettebits))
+        {
+          mode_out->colortype = LCT_GREY;
+          mode_out->bitdepth = profile.greybits;
+          if(profile.key)
+          {
+            unsigned keyval = profile.key_r;
+            keyval &= (profile.greybits - 1); /*same subgroup of bits repeated, so taking right bits is fine*/
+            mode_out->key_defined = 1;
+            mode_out->key_r = keyval;
+            mode_out->key_g = keyval;
+            mode_out->key_b = keyval;
+          }
+        }
+        else
+        {
+          /*fill in the palette*/
+          unsigned i;
+          unsigned char* p = profile.palette;
+          for(i = 0; i < profile.numcolors; i++)
+          {
+            error = lodepng_palette_add(mode_out, p[i * 4 + 0], p[i * 4 + 1], p[i * 4 + 2], p[i * 4 + 3]);
+            if(error) break;
+          }
+
+          mode_out->colortype = LCT_PALETTE;
+          mode_out->bitdepth = palettebits;
+        }
+      }
+      else /*8-bit per channel*/
+      {
+        mode_out->bitdepth = 8;
+        if(profile.alpha)
+        {
+          mode_out->colortype = profile.colored ? LCT_RGBA : LCT_GREY_ALPHA;
+        }
+        else
+        {
+          mode_out->colortype = profile.colored ? LCT_RGB : LCT_GREY /*LCT_GREY normally won't occur, already done earlier*/;
+          if(profile.key)
+          {
+            mode_out->key_defined = 1;
+            mode_out->key_r = profile.key_r % 256;
+            mode_out->key_g = profile.key_g % 256;
+            mode_out->key_b = profile.key_b % 256;
+          }
+        }
+      }
+    }
+  }
+
+  color_profile_cleanup(&profile);
+
+  if(mode_out->colortype == LCT_PALETTE && mode_in->palettesize == mode_out->palettesize)
+  {
+    /*In this case keep the palette order of the input, so that the user can choose an optimal one*/
+    size_t i;
+    for(i = 0; i < mode_in->palettesize * 4; i++)
+    {
+      mode_out->palette[i] = mode_in->palette[i];
+    }
+  }
+
+  if(auto_convert == LAC_AUTO_NO_NIBBLES && mode_out->bitdepth < 8)
+  {
+    /*palette can keep its small amount of colors, as long as no indices use it*/
+    mode_out->bitdepth = 8;
+  }
+
+  return error;
+}
+
+#endif /* #ifdef LODEPNG_COMPILE_ENCODER */
+
+/*
+Paeth predicter, used by PNG filter type 4
+The parameters are of type short, but should come from unsigned chars, the shorts
+are only needed to make the paeth calculation correct.
+*/
+static unsigned char paethPredictor(short a, short b, short c)
+{
+  short pa = abs(b - c);
+  short pb = abs(a - c);
+  short pc = abs(a + b - c - c);
+
+  if(pc < pa && pc < pb) return (unsigned char)c;
+  else if(pb < pa) return (unsigned char)b;
+  else return (unsigned char)a;
+}
+
+/*shared values used by multiple Adam7 related functions*/
+
+static const unsigned ADAM7_IX[7] = { 0, 4, 0, 2, 0, 1, 0 }; /*x start values*/
+static const unsigned ADAM7_IY[7] = { 0, 0, 4, 0, 2, 0, 1 }; /*y start values*/
+static const unsigned ADAM7_DX[7] = { 8, 8, 4, 4, 2, 2, 1 }; /*x delta values*/
+static const unsigned ADAM7_DY[7] = { 8, 8, 8, 4, 4, 2, 2 }; /*y delta values*/
+
+static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8],
+                                size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp)
+{
+  /*the passstart values have 8 values: the 8th one indicates the byte after the end of the 7th (= last) pass*/
+  unsigned i;
+
+  /*calculate width and height in pixels of each pass*/
+  for(i = 0; i < 7; i++)
+  {
+    passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i];
+    passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i];
+    if(passw[i] == 0) passh[i] = 0;
+    if(passh[i] == 0) passw[i] = 0;
+  }
+
+  filter_passstart[0] = padded_passstart[0] = passstart[0] = 0;
+  for(i = 0; i < 7; i++)
+  {
+    /*if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte)*/
+    filter_passstart[i + 1] = filter_passstart[i]
+                            + ((passw[i] && passh[i]) ? passh[i] * (1 + (passw[i] * bpp + 7) / 8) : 0);
+    /*bits padded if needed to fill full byte at end of each scanline*/
+    padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7) / 8);
+    /*only padded at end of reduced image*/
+    passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7) / 8;
+  }
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / PNG Decoder                                                            / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*read the information from the header and store it in the LodePNGInfo. return value is error*/
+unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state,
+                         const unsigned char* in, size_t insize)
+{
+  LodePNGInfo* info = &state->info_png;
+  if(insize == 0 || in == 0)
+  {
+    CERROR_RETURN_ERROR(state->error, 48); /*error: the given data is empty*/
+  }
+  if(insize < 29)
+  {
+    CERROR_RETURN_ERROR(state->error, 27); /*error: the data length is smaller than the length of a PNG header*/
+  }
+
+  /*when decoding a new PNG image, make sure all parameters created after previous decoding are reset*/
+  lodepng_info_cleanup(info);
+  lodepng_info_init(info);
+
+  if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71
+     || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10)
+  {
+    CERROR_RETURN_ERROR(state->error, 28); /*error: the first 8 bytes are not the correct PNG signature*/
+  }
+  if(in[12] != 'I' || in[13] != 'H' || in[14] != 'D' || in[15] != 'R')
+  {
+    CERROR_RETURN_ERROR(state->error, 29); /*error: it doesn't start with a IHDR chunk!*/
+  }
+
+  /*read the values given in the header*/
+  *w = lodepng_read32bitInt(&in[16]);
+  *h = lodepng_read32bitInt(&in[20]);
+  info->color.bitdepth = in[24];
+  info->color.colortype = (LodePNGColorType)in[25];
+  info->compression_method = in[26];
+  info->filter_method = in[27];
+  info->interlace_method = in[28];
+
+  if(!state->decoder.ignore_crc)
+  {
+    unsigned CRC = lodepng_read32bitInt(&in[29]);
+    unsigned checksum = lodepng_crc32(&in[12], 17);
+    if(CRC != checksum)
+    {
+      CERROR_RETURN_ERROR(state->error, 57); /*invalid CRC*/
+    }
+  }
+
+  /*error: only compression method 0 is allowed in the specification*/
+  if(info->compression_method != 0) CERROR_RETURN_ERROR(state->error, 32);
+  /*error: only filter method 0 is allowed in the specification*/
+  if(info->filter_method != 0) CERROR_RETURN_ERROR(state->error, 33);
+  /*error: only interlace methods 0 and 1 exist in the specification*/
+  if(info->interlace_method > 1) CERROR_RETURN_ERROR(state->error, 34);
+
+  state->error = checkColorValidity(info->color.colortype, info->color.bitdepth);
+  return state->error;
+}
+
+static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon,
+                                 size_t bytewidth, unsigned char filterType, size_t length)
+{
+  /*
+  For PNG filter method 0
+  unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte,
+  the filter works byte per byte (bytewidth = 1)
+  precon is the previous unfiltered scanline, recon the result, scanline the current one
+  the incoming scanlines do NOT include the filtertype byte, that one is given in the parameter filterType instead
+  recon and scanline MAY be the same memory address! precon must be disjoint.
+  */
+
+  size_t i;
+  switch(filterType)
+  {
+    case 0:
+      for(i = 0; i < length; i++) recon[i] = scanline[i];
+      break;
+    case 1:
+      for(i = 0; i < bytewidth; i++) recon[i] = scanline[i];
+      for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth];
+      break;
+    case 2:
+      if(precon)
+      {
+        for(i = 0; i < length; i++) recon[i] = scanline[i] + precon[i];
+      }
+      else
+      {
+        for(i = 0; i < length; i++) recon[i] = scanline[i];
+      }
+      break;
+    case 3:
+      if(precon)
+      {
+        for(i = 0; i < bytewidth; i++) recon[i] = scanline[i] + precon[i] / 2;
+        for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) / 2);
+      }
+      else
+      {
+        for(i = 0; i < bytewidth; i++) recon[i] = scanline[i];
+        for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth] / 2;
+      }
+      break;
+    case 4:
+      if(precon)
+      {
+        for(i = 0; i < bytewidth; i++)
+        {
+          recon[i] = (scanline[i] + precon[i]); /*paethPredictor(0, precon[i], 0) is always precon[i]*/
+        }
+        for(i = bytewidth; i < length; i++)
+        {
+          recon[i] = (scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth]));
+        }
+      }
+      else
+      {
+        for(i = 0; i < bytewidth; i++)
+        {
+          recon[i] = scanline[i];
+        }
+        for(i = bytewidth; i < length; i++)
+        {
+          /*paethPredictor(recon[i - bytewidth], 0, 0) is always recon[i - bytewidth]*/
+          recon[i] = (scanline[i] + recon[i - bytewidth]);
+        }
+      }
+      break;
+    default: return 36; /*error: unexisting filter type given*/
+  }
+  return 0;
+}
+
+static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp)
+{
+  /*
+  For PNG filter method 0
+  this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 seven times)
+  out must have enough bytes allocated already, in must have the scanlines + 1 filtertype byte per scanline
+  w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel
+  in and out are allowed to be the same memory address (but aren't the same size since in has the extra filter bytes)
+  */
+
+  unsigned y;
+  unsigned char* prevline = 0;
+
+  /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/
+  size_t bytewidth = (bpp + 7) / 8;
+  size_t linebytes = (w * bpp + 7) / 8;
+
+  for(y = 0; y < h; y++)
+  {
+    size_t outindex = linebytes * y;
+    size_t inindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/
+    unsigned char filterType = in[inindex];
+
+    CERROR_TRY_RETURN(unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterType, linebytes));
+
+    prevline = &out[outindex];
+  }
+
+  return 0;
+}
+
+static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp)
+{
+  /*Note: this function works on image buffers WITHOUT padding bits at end of scanlines
+  with non-multiple-of-8 bit amounts, only between reduced images is padding
+  out must be big enough AND must be 0 everywhere if bpp < 8 in the current implementation
+  (because that's likely a little bit faster)*/
+  unsigned passw[7], passh[7];
+  size_t filter_passstart[8], padded_passstart[8], passstart[8];
+  unsigned i;
+
+  Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
+
+  if(bpp >= 8)
+  {
+    for(i = 0; i < 7; i++)
+    {
+      unsigned x, y, b;
+      size_t bytewidth = bpp / 8;
+      for(y = 0; y < passh[i]; y++)
+      for(x = 0; x < passw[i]; x++)
+      {
+        size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth;
+        size_t pixeloutstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth;
+        for(b = 0; b < bytewidth; b++)
+        {
+          out[pixeloutstart + b] = in[pixelinstart + b];
+        }
+      }
+    }
+  }
+  else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/
+  {
+    for(i = 0; i < 7; i++)
+    {
+      unsigned x, y, b;
+      unsigned ilinebits = bpp * passw[i];
+      unsigned olinebits = bpp * w;
+      size_t obp, ibp; /*bit pointers (for out and in buffer)*/
+      for(y = 0; y < passh[i]; y++)
+      for(x = 0; x < passw[i]; x++)
+      {
+        ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp);
+        obp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp;
+        for(b = 0; b < bpp; b++)
+        {
+          unsigned char bit = readBitFromReversedStream(&ibp, in);
+          /*note that this function assumes the out buffer is completely 0, use setBitOfReversedStream otherwise*/
+          setBitOfReversedStream0(&obp, out, bit);
+        }
+      }
+    }
+  }
+}
+
+static void removePaddingBits(unsigned char* out, const unsigned char* in,
+                              size_t olinebits, size_t ilinebits, unsigned h)
+{
+  /*
+  After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need
+  to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers
+  for the Adam7 code, the color convert code and the output to the user.
+  in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must
+  have >= ilinebits*h bits, out must have >= olinebits*h bits, olinebits must be <= ilinebits
+  also used to move bits after earlier such operations happened, e.g. in a sequence of reduced images from Adam7
+  only useful if (ilinebits - olinebits) is a value in the range 1..7
+  */
+  unsigned y;
+  size_t diff = ilinebits - olinebits;
+  size_t ibp = 0, obp = 0; /*input and output bit pointers*/
+  for(y = 0; y < h; y++)
+  {
+    size_t x;
+    for(x = 0; x < olinebits; x++)
+    {
+      unsigned char bit = readBitFromReversedStream(&ibp, in);
+      setBitOfReversedStream(&obp, out, bit);
+    }
+    ibp += diff;
+  }
+}
+
+/*out must be buffer big enough to contain full image, and in must contain the full decompressed data from
+the IDAT chunks (with filter index bytes and possible padding bits)
+return value is error*/
+static unsigned postProcessScanlines(unsigned char* out, unsigned char* in,
+                                     unsigned w, unsigned h, const LodePNGInfo* info_png)
+{
+  /*
+  This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype.
+  Steps:
+  *) if no Adam7: 1) unfilter 2) remove padding bits (= posible extra bits per scanline if bpp < 8)
+  *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace
+  NOTE: the in buffer will be overwritten with intermediate data!
+  */
+  unsigned bpp = lodepng_get_bpp(&info_png->color);
+  if(bpp == 0) return 31; /*error: invalid colortype*/
+
+  if(info_png->interlace_method == 0)
+  {
+    if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8)
+    {
+      CERROR_TRY_RETURN(unfilter(in, in, w, h, bpp));
+      removePaddingBits(out, in, w * bpp, ((w * bpp + 7) / 8) * 8, h);
+    }
+    /*we can immediatly filter into the out buffer, no other steps needed*/
+    else CERROR_TRY_RETURN(unfilter(out, in, w, h, bpp));
+  }
+  else /*interlace_method is 1 (Adam7)*/
+  {
+    unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8];
+    unsigned i;
+
+    Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
+
+    for(i = 0; i < 7; i++)
+    {
+      CERROR_TRY_RETURN(unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp));
+      /*TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline,
+      move bytes instead of bits or move not at all*/
+      if(bpp < 8)
+      {
+        /*remove padding bits in scanlines; after this there still may be padding
+        bits between the different reduced images: each reduced image still starts nicely at a byte*/
+        removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp,
+                          ((passw[i] * bpp + 7) / 8) * 8, passh[i]);
+      }
+    }
+
+    Adam7_deinterlace(out, in, w, h, bpp);
+  }
+
+  return 0;
+}
+
+/*read a PNG, the result will be in the same color type as the PNG (hence "generic")*/
+static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h,
+                          LodePNGState* state,
+                          const unsigned char* in, size_t insize)
+{
+  unsigned char IEND = 0;
+  const unsigned char* chunk;
+  size_t i;
+  ucvector idat; /*the data from idat chunks*/
+
+  /*for unknown chunk order*/
+  unsigned unknown = 0;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  unsigned critical_pos = 1; /*1 = after IHDR, 2 = after PLTE, 3 = after IDAT*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+  /*provide some proper output values if error will happen*/
+  *out = 0;
+
+  state->error = lodepng_inspect(w, h, state, in, insize); /*reads header and resets other parameters in state->info_png*/
+  if(state->error) return;
+
+  ucvector_init(&idat);
+  chunk = &in[33]; /*first byte of the first chunk after the header*/
+
+  /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk.
+  IDAT data is put at the start of the in buffer*/
+  while(!IEND && !state->error)
+  {
+    unsigned chunkLength;
+    const unsigned char* data; /*the data in the chunk*/
+
+    /*error: size of the in buffer too small to contain next chunk*/
+    if((size_t)((chunk - in) + 12) > insize || chunk < in) CERROR_BREAK(state->error, 30);
+
+    /*length of the data of the chunk, excluding the length bytes, chunk type and CRC bytes*/
+    chunkLength = lodepng_chunk_length(chunk);
+    /*error: chunk length larger than the max PNG chunk size*/
+    if(chunkLength > 2147483647) CERROR_BREAK(state->error, 63);
+
+    if((size_t)((chunk - in) + chunkLength + 12) > insize || (chunk + chunkLength + 12) < in)
+    {
+      CERROR_BREAK(state->error, 64); /*error: size of the in buffer too small to contain next chunk*/
+    }
+
+    data = lodepng_chunk_data_const(chunk);
+
+    /*IDAT chunk, containing compressed image data*/
+    if(lodepng_chunk_type_equals(chunk, "IDAT"))
+    {
+      size_t oldsize = idat.size;
+      if(!ucvector_resize(&idat, oldsize + chunkLength)) CERROR_BREAK(state->error, 83 /*alloc fail*/);
+      for(i = 0; i < chunkLength; i++) idat.data[oldsize + i] = data[i];
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+      critical_pos = 3;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    }
+    /*IEND chunk*/
+    else if(lodepng_chunk_type_equals(chunk, "IEND"))
+    {
+      IEND = 1;
+    }
+    /*palette chunk (PLTE)*/
+    else if(lodepng_chunk_type_equals(chunk, "PLTE"))
+    {
+      unsigned pos = 0;
+      if(state->info_png.color.palette) myfree(state->info_png.color.palette);
+      state->info_png.color.palettesize = chunkLength / 3;
+      state->info_png.color.palette = (unsigned char*)mymalloc(4 * state->info_png.color.palettesize);
+      if(!state->info_png.color.palette && state->info_png.color.palettesize)
+      {
+        state->info_png.color.palettesize = 0;
+        CERROR_BREAK(state->error, 83); /*alloc fail*/
+      }
+      if(state->info_png.color.palettesize > 256) CERROR_BREAK(state->error, 38); /*error: palette too big*/
+
+      for(i = 0; i < state->info_png.color.palettesize; i++)
+      {
+        state->info_png.color.palette[4 * i + 0] = data[pos++]; /*R*/
+        state->info_png.color.palette[4 * i + 1] = data[pos++]; /*G*/
+        state->info_png.color.palette[4 * i + 2] = data[pos++]; /*B*/
+        state->info_png.color.palette[4 * i + 3] = 255; /*alpha*/
+      }
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+      critical_pos = 2;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    }
+    /*palette transparency chunk (tRNS)*/
+    else if(lodepng_chunk_type_equals(chunk, "tRNS"))
+    {
+      if(state->info_png.color.colortype == LCT_PALETTE)
+      {
+        /*error: more alpha values given than there are palette entries*/
+        if(chunkLength > state->info_png.color.palettesize) CERROR_BREAK(state->error, 38);
+
+        for(i = 0; i < chunkLength; i++) state->info_png.color.palette[4 * i + 3] = data[i];
+      }
+      else if(state->info_png.color.colortype == LCT_GREY)
+      {
+        /*error: this chunk must be 2 bytes for greyscale image*/
+        if(chunkLength != 2) CERROR_BREAK(state->error, 30);
+
+        state->info_png.color.key_defined = 1;
+        state->info_png.color.key_r = state->info_png.color.key_g
+                                     = state->info_png.color.key_b = 256 * data[0] + data[1];
+      }
+      else if(state->info_png.color.colortype == LCT_RGB)
+      {
+        /*error: this chunk must be 6 bytes for RGB image*/
+        if(chunkLength != 6) CERROR_BREAK(state->error, 41);
+
+        state->info_png.color.key_defined = 1;
+        state->info_png.color.key_r = 256 * data[0] + data[1];
+        state->info_png.color.key_g = 256 * data[2] + data[3];
+        state->info_png.color.key_b = 256 * data[4] + data[5];
+      }
+      else CERROR_BREAK(state->error, 42); /*error: tRNS chunk not allowed for other color models*/
+    }
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    /*background color chunk (bKGD)*/
+    else if(lodepng_chunk_type_equals(chunk, "bKGD"))
+    {
+      if(state->info_png.color.colortype == LCT_PALETTE)
+      {
+        /*error: this chunk must be 1 byte for indexed color image*/
+        if(chunkLength != 1) CERROR_BREAK(state->error, 43);
+
+        state->info_png.background_defined = 1;
+        state->info_png.background_r = state->info_png.background_g = state->info_png.background_b = data[0];
+      }
+      else if(state->info_png.color.colortype == LCT_GREY || state->info_png.color.colortype == LCT_GREY_ALPHA)
+      {
+        /*error: this chunk must be 2 bytes for greyscale image*/
+        if(chunkLength != 2) CERROR_BREAK(state->error, 44);
+
+        state->info_png.background_defined = 1;
+        state->info_png.background_r = state->info_png.background_g = state->info_png.background_b
+                                     = 256 * data[0] + data[1];
+      }
+      else if(state->info_png.color.colortype == LCT_RGB || state->info_png.color.colortype == LCT_RGBA)
+      {
+        /*error: this chunk must be 6 bytes for greyscale image*/
+        if(chunkLength != 6) CERROR_BREAK(state->error, 45);
+
+        state->info_png.background_defined = 1;
+        state->info_png.background_r = 256 * data[0] + data[1];
+        state->info_png.background_g = 256 * data[2] + data[3];
+        state->info_png.background_b = 256 * data[4] + data[5];
+      }
+    }
+    /*text chunk (tEXt)*/
+    else if(lodepng_chunk_type_equals(chunk, "tEXt"))
+    {
+      if(state->decoder.read_text_chunks)
+      {
+        char *key = 0, *str = 0;
+
+        while(!state->error) /*not really a while loop, only used to break on error*/
+        {
+          unsigned length, string2_begin;
+
+          length = 0;
+          while(length < chunkLength && data[length] != 0) length++;
+          /*error, end reached, no null terminator?*/
+          if(length + 1 >= chunkLength) CERROR_BREAK(state->error, 75);
+
+          key = (char*)mymalloc(length + 1);
+          if(!key) CERROR_BREAK(state->error, 83); /*alloc fail*/
+
+          key[length] = 0;
+          for(i = 0; i < length; i++) key[i] = data[i];
+
+          string2_begin = length + 1;
+          /*error, end reached, no null terminator?*/
+          if(string2_begin > chunkLength) CERROR_BREAK(state->error, 75);
+
+          length = chunkLength - string2_begin;
+          str = (char*)mymalloc(length + 1);
+          if(!str) CERROR_BREAK(state->error, 83); /*alloc fail*/
+
+          str[length] = 0;
+          for(i = 0; i < length; i++) str[i] = data[string2_begin + i];
+
+          state->error = lodepng_add_text(&state->info_png, key, str);
+
+          break;
+        }
+
+        myfree(key);
+        myfree(str);
+      }
+    }
+    /*compressed text chunk (zTXt)*/
+    else if(lodepng_chunk_type_equals(chunk, "zTXt"))
+    {
+      if(state->decoder.read_text_chunks)
+      {
+        unsigned length, string2_begin;
+        char *key = 0;
+        ucvector decoded;
+
+        ucvector_init(&decoded);
+
+        while(!state->error) /*not really a while loop, only used to break on error*/
+        {
+          for(length = 0; length < chunkLength && data[length] != 0; length++) ;
+          if(length + 2 >= chunkLength) CERROR_BREAK(state->error, 75); /*no null termination, corrupt?*/
+
+          key = (char*)mymalloc(length + 1);
+          if(!key) CERROR_BREAK(state->error, 83); /*alloc fail*/
+
+          key[length] = 0;
+          for(i = 0; i < length; i++) key[i] = data[i];
+
+          if(data[length + 1] != 0) CERROR_BREAK(state->error, 72); /*the 0 byte indicating compression must be 0*/
+
+          string2_begin = length + 2;
+          if(string2_begin > chunkLength) CERROR_BREAK(state->error, 75); /*no null termination, corrupt?*/
+
+          length = chunkLength - string2_begin;
+          state->error = lodepng_zlib_decompress(&decoded.data, &decoded.size,
+                                                   (unsigned char*)(&data[string2_begin]),
+                                                   length, &state->decoder.zlibsettings);
+          if(state->error) break;
+          ucvector_push_back(&decoded, 0);
+
+          state->error = lodepng_add_text(&state->info_png, key, (char*)decoded.data);
+
+          break;
+        }
+
+        myfree(key);
+        ucvector_cleanup(&decoded);
+        if(state->error) break;
+      }
+    }
+    /*international text chunk (iTXt)*/
+    else if(lodepng_chunk_type_equals(chunk, "iTXt"))
+    {
+      if(state->decoder.read_text_chunks)
+      {
+        unsigned length, begin, compressed;
+        char *key = 0, *langtag = 0, *transkey = 0;
+        ucvector decoded;
+        ucvector_init(&decoded);
+
+        while(!state->error) /*not really a while loop, only used to break on error*/
+        {
+          /*Quick check if the chunk length isn't too small. Even without check
+          it'd still fail with other error checks below if it's too short. This just gives a different error code.*/
+          if(chunkLength < 5) CERROR_BREAK(state->error, 30); /*iTXt chunk too short*/
+
+          /*read the key*/
+          for(length = 0; length < chunkLength && data[length] != 0; length++) ;
+          if(length + 2 >= chunkLength) CERROR_BREAK(state->error, 75); /*no null termination char found*/
+
+          key = (char*)mymalloc(length + 1);
+          if(!key) CERROR_BREAK(state->error, 83); /*alloc fail*/
+
+          key[length] = 0;
+          for(i = 0; i < length; i++) key[i] = data[i];
+
+          /*read the compression method*/
+          compressed = data[length + 1];
+          if(data[length + 2] != 0) CERROR_BREAK(state->error, 72); /*the 0 byte indicating compression must be 0*/
+
+          /*read the langtag*/
+          begin = length + 3;
+          length = 0;
+          for(i = begin; i < chunkLength && data[i] != 0; i++) length++;
+          if(begin + length + 1 >= chunkLength) CERROR_BREAK(state->error, 75); /*no null termination char found*/
+
+          langtag = (char*)mymalloc(length + 1);
+          if(!langtag) CERROR_BREAK(state->error, 83); /*alloc fail*/
+
+          langtag[length] = 0;
+          for(i = 0; i < length; i++) langtag[i] = data[begin + i];
+
+          /*read the transkey*/
+          begin += length + 1;
+          length = 0;
+          for(i = begin; i < chunkLength && data[i] != 0; i++) length++;
+          if(begin + length + 1 >= chunkLength) CERROR_BREAK(state->error, 75); /*no null termination, corrupt?*/
+
+          transkey = (char*)mymalloc(length + 1);
+          if(!transkey) CERROR_BREAK(state->error, 83); /*alloc fail*/
+
+          transkey[length] = 0;
+          for(i = 0; i < length; i++) transkey[i] = data[begin + i];
+
+          /*read the actual text*/
+          begin += length + 1;
+          if(begin > chunkLength) CERROR_BREAK(state->error, 75); /*no null termination, corrupt?*/
+
+          length = chunkLength - begin;
+
+          if(compressed)
+          {
+            state->error = lodepng_zlib_decompress(&decoded.data, &decoded.size,
+                                                   (unsigned char*)(&data[begin]),
+                                                   length, &state->decoder.zlibsettings);
+            if(state->error) break;
+            if(decoded.allocsize < decoded.size) decoded.allocsize = decoded.size;
+            ucvector_push_back(&decoded, 0);
+          }
+          else
+          {
+            if(!ucvector_resize(&decoded, length + 1)) CERROR_BREAK(state->error, 83 /*alloc fail*/);
+
+            decoded.data[length] = 0;
+            for(i = 0; i < length; i++) decoded.data[i] = data[begin + i];
+          }
+
+          state->error = lodepng_add_itext(&state->info_png, key, langtag, transkey, (char*)decoded.data);
+
+          break;
+        }
+
+        myfree(key);
+        myfree(langtag);
+        myfree(transkey);
+        ucvector_cleanup(&decoded);
+        if(state->error) break;
+      }
+    }
+    else if(lodepng_chunk_type_equals(chunk, "tIME"))
+    {
+      if(chunkLength != 7) CERROR_BREAK(state->error, 73); /*invalid tIME chunk size*/
+
+      state->info_png.time_defined = 1;
+      state->info_png.time.year = 256 * data[0] + data[+ 1];
+      state->info_png.time.month = data[2];
+      state->info_png.time.day = data[3];
+      state->info_png.time.hour = data[4];
+      state->info_png.time.minute = data[5];
+      state->info_png.time.second = data[6];
+    }
+    else if(lodepng_chunk_type_equals(chunk, "pHYs"))
+    {
+      if(chunkLength != 9) CERROR_BREAK(state->error, 74); /*invalid pHYs chunk size*/
+
+      state->info_png.phys_defined = 1;
+      state->info_png.phys_x = 16777216 * data[0] + 65536 * data[1] + 256 * data[2] + data[3];
+      state->info_png.phys_y = 16777216 * data[4] + 65536 * data[5] + 256 * data[6] + data[7];
+      state->info_png.phys_unit = data[8];
+    }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    else /*it's not an implemented chunk type, so ignore it: skip over the data*/
+    {
+      /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/
+      if(!lodepng_chunk_ancillary(chunk)) CERROR_BREAK(state->error, 69);
+
+      unknown = 1;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+      if(state->decoder.remember_unknown_chunks)
+      {
+        state->error = lodepng_chunk_append(&state->info_png.unknown_chunks_data[critical_pos - 1],
+                                            &state->info_png.unknown_chunks_size[critical_pos - 1], chunk);
+        if(state->error) break;
+      }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    }
+
+    if(!state->decoder.ignore_crc && !unknown) /*check CRC if wanted, only on known chunk types*/
+    {
+      if(lodepng_chunk_check_crc(chunk)) CERROR_BREAK(state->error, 57); /*invalid CRC*/
+    }
+
+    if(!IEND) chunk = lodepng_chunk_next_const(chunk);
+  }
+
+  if(!state->error)
+  {
+    ucvector scanlines;
+    ucvector_init(&scanlines);
+
+    /*maximum final image length is already reserved in the vector's length - this is not really necessary*/
+    if(!ucvector_resize(&scanlines, lodepng_get_raw_size(*w, *h, &state->info_png.color) + *h))
+    {
+      state->error = 83; /*alloc fail*/
+    }
+    if(!state->error)
+    {
+      /*decompress with the Zlib decompressor*/
+      state->error = lodepng_zlib_decompress(&scanlines.data, &scanlines.size, idat.data,
+                                             idat.size, &state->decoder.zlibsettings);
+    }
+
+    if(!state->error)
+    {
+      ucvector outv;
+      ucvector_init(&outv);
+      if(!ucvector_resizev(&outv,
+          lodepng_get_raw_size(*w, *h, &state->info_png.color), 0)) state->error = 83; /*alloc fail*/
+      if(!state->error) state->error = postProcessScanlines(outv.data, scanlines.data, *w, *h, &state->info_png);
+      *out = outv.data;
+    }
+    ucvector_cleanup(&scanlines);
+  }
+
+  ucvector_cleanup(&idat);
+}
+
+unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h,
+                        LodePNGState* state,
+                        const unsigned char* in, size_t insize)
+{
+  *out = 0;
+  decodeGeneric(out, w, h, state, in, insize);
+  if(state->error) return state->error;
+  if(!state->decoder.color_convert || lodepng_color_mode_equal(&state->info_raw, &state->info_png.color))
+  {
+    /*same color type, no copying or converting of data needed*/
+    /*store the info_png color settings on the info_raw so that the info_raw still reflects what colortype
+    the raw image has to the end user*/
+    if(!state->decoder.color_convert)
+    {
+      state->error = lodepng_color_mode_copy(&state->info_raw, &state->info_png.color);
+      if(state->error) return state->error;
+    }
+  }
+  else
+  {
+    /*color conversion needed; sort of copy of the data*/
+    unsigned char* data = *out;
+    size_t outsize;
+
+    /*TODO: check if this works according to the statement in the documentation: "The converter can convert
+    from greyscale input color type, to 8-bit greyscale or greyscale with alpha"*/
+    if(!(state->info_raw.colortype == LCT_RGB || state->info_raw.colortype == LCT_RGBA)
+       && !(state->info_raw.bitdepth == 8))
+    {
+      return 56; /*unsupported color mode conversion*/
+    }
+
+    outsize = lodepng_get_raw_size(*w, *h, &state->info_raw);
+    *out = (unsigned char*)mymalloc(outsize);
+    if(!(*out))
+    {
+      state->error = 83; /*alloc fail*/
+    }
+    else state->error = lodepng_convert(*out, data, &state->info_raw, &state->info_png.color, *w, *h);
+    myfree(data);
+  }
+  return state->error;
+}
+
+unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in,
+                               size_t insize, LodePNGColorType colortype, unsigned bitdepth)
+{
+  unsigned error;
+  LodePNGState state;
+  lodepng_state_init(&state);
+  state.info_raw.colortype = colortype;
+  state.info_raw.bitdepth = bitdepth;
+  error = lodepng_decode(out, w, h, &state, in, insize);
+  lodepng_state_cleanup(&state);
+  return error;
+}
+
+unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize)
+{
+  return lodepng_decode_memory(out, w, h, in, insize, LCT_RGBA, 8);
+}
+
+unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize)
+{
+  return lodepng_decode_memory(out, w, h, in, insize, LCT_RGB, 8);
+}
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename,
+                             LodePNGColorType colortype, unsigned bitdepth)
+{
+  unsigned char* buffer;
+  size_t buffersize;
+  unsigned error;
+  error = lodepng_load_file(&buffer, &buffersize, filename);
+  if(!error) error = lodepng_decode_memory(out, w, h, buffer, buffersize, colortype, bitdepth);
+  myfree(buffer);
+  return error;
+}
+
+unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename)
+{
+  return lodepng_decode_file(out, w, h, filename, LCT_RGBA, 8);
+}
+
+unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename)
+{
+  return lodepng_decode_file(out, w, h, filename, LCT_RGB, 8);
+}
+#endif /*LODEPNG_COMPILE_DISK*/
+
+void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings)
+{
+  settings->color_convert = 1;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  settings->read_text_chunks = 1;
+  settings->remember_unknown_chunks = 0;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+  settings->ignore_crc = 0;
+  lodepng_decompress_settings_init(&settings->zlibsettings);
+}
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER)
+
+void lodepng_state_init(LodePNGState* state)
+{
+#ifdef LODEPNG_COMPILE_DECODER
+  lodepng_decoder_settings_init(&state->decoder);
+#endif /*LODEPNG_COMPILE_DECODER*/
+#ifdef LODEPNG_COMPILE_ENCODER
+  lodepng_encoder_settings_init(&state->encoder);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+  lodepng_color_mode_init(&state->info_raw);
+  lodepng_info_init(&state->info_png);
+  state->error = 1;
+}
+
+void lodepng_state_cleanup(LodePNGState* state)
+{
+  lodepng_color_mode_cleanup(&state->info_raw);
+  lodepng_info_cleanup(&state->info_png);
+}
+
+void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source)
+{
+  lodepng_state_cleanup(dest);
+  *dest = *source;
+  lodepng_color_mode_init(&dest->info_raw);
+  lodepng_info_init(&dest->info_png);
+  dest->error = lodepng_color_mode_copy(&dest->info_raw, &source->info_raw); if(dest->error) return;
+  dest->error = lodepng_info_copy(&dest->info_png, &source->info_png); if(dest->error) return;
+}
+
+#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / PNG Encoder                                                            / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*chunkName must be string of 4 characters*/
+static unsigned addChunk(ucvector* out, const char* chunkName, const unsigned char* data, size_t length)
+{
+  CERROR_TRY_RETURN(lodepng_chunk_create(&out->data, &out->size, (unsigned)length, chunkName, data));
+  out->allocsize = out->size; /*fix the allocsize again*/
+  return 0;
+}
+
+static void writeSignature(ucvector* out)
+{
+  /*8 bytes PNG signature, aka the magic bytes*/
+  ucvector_push_back(out, 137);
+  ucvector_push_back(out, 80);
+  ucvector_push_back(out, 78);
+  ucvector_push_back(out, 71);
+  ucvector_push_back(out, 13);
+  ucvector_push_back(out, 10);
+  ucvector_push_back(out, 26);
+  ucvector_push_back(out, 10);
+}
+
+static unsigned addChunk_IHDR(ucvector* out, unsigned w, unsigned h,
+                              LodePNGColorType colortype, unsigned bitdepth, unsigned interlace_method)
+{
+  unsigned error = 0;
+  ucvector header;
+  ucvector_init(&header);
+
+  lodepng_add32bitInt(&header, w); /*width*/
+  lodepng_add32bitInt(&header, h); /*height*/
+  ucvector_push_back(&header, (unsigned char)bitdepth); /*bit depth*/
+  ucvector_push_back(&header, (unsigned char)colortype); /*color type*/
+  ucvector_push_back(&header, 0); /*compression method*/
+  ucvector_push_back(&header, 0); /*filter method*/
+  ucvector_push_back(&header, interlace_method); /*interlace method*/
+
+  error = addChunk(out, "IHDR", header.data, header.size);
+  ucvector_cleanup(&header);
+
+  return error;
+}
+
+static unsigned addChunk_PLTE(ucvector* out, const LodePNGColorMode* info)
+{
+  unsigned error = 0;
+  size_t i;
+  ucvector PLTE;
+  ucvector_init(&PLTE);
+  for(i = 0; i < info->palettesize * 4; i++)
+  {
+    /*add all channels except alpha channel*/
+    if(i % 4 != 3) ucvector_push_back(&PLTE, info->palette[i]);
+  }
+  error = addChunk(out, "PLTE", PLTE.data, PLTE.size);
+  ucvector_cleanup(&PLTE);
+
+  return error;
+}
+
+static unsigned addChunk_tRNS(ucvector* out, const LodePNGColorMode* info)
+{
+  unsigned error = 0;
+  size_t i;
+  ucvector tRNS;
+  ucvector_init(&tRNS);
+  if(info->colortype == LCT_PALETTE)
+  {
+    size_t amount = info->palettesize;
+    /*the tail of palette values that all have 255 as alpha, does not have to be encoded*/
+    for(i = info->palettesize; i > 0; i--)
+    {
+      if(info->palette[4 * (i - 1) + 3] == 255) amount--;
+      else break;
+    }
+    /*add only alpha channel*/
+    for(i = 0; i < amount; i++) ucvector_push_back(&tRNS, info->palette[4 * i + 3]);
+  }
+  else if(info->colortype == LCT_GREY)
+  {
+    if(info->key_defined)
+    {
+      ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256));
+      ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256));
+    }
+  }
+  else if(info->colortype == LCT_RGB)
+  {
+    if(info->key_defined)
+    {
+      ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256));
+      ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256));
+      ucvector_push_back(&tRNS, (unsigned char)(info->key_g / 256));
+      ucvector_push_back(&tRNS, (unsigned char)(info->key_g % 256));
+      ucvector_push_back(&tRNS, (unsigned char)(info->key_b / 256));
+      ucvector_push_back(&tRNS, (unsigned char)(info->key_b % 256));
+    }
+  }
+
+  error = addChunk(out, "tRNS", tRNS.data, tRNS.size);
+  ucvector_cleanup(&tRNS);
+
+  return error;
+}
+
+static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t datasize,
+                              LodePNGCompressSettings* zlibsettings)
+{
+  ucvector zlibdata;
+  unsigned error = 0;
+
+  /*compress with the Zlib compressor*/
+  ucvector_init(&zlibdata);
+  error = lodepng_zlib_compress(&zlibdata.data, &zlibdata.size, data, datasize, zlibsettings);
+  if(!error) error = addChunk(out, "IDAT", zlibdata.data, zlibdata.size);
+  ucvector_cleanup(&zlibdata);
+
+  return error;
+}
+
+static unsigned addChunk_IEND(ucvector* out)
+{
+  unsigned error = 0;
+  error = addChunk(out, "IEND", 0, 0);
+  return error;
+}
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+
+static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring)
+{
+  unsigned error = 0;
+  size_t i;
+  ucvector text;
+  ucvector_init(&text);
+  for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&text, (unsigned char)keyword[i]);
+  ucvector_push_back(&text, 0);
+  for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&text, (unsigned char)textstring[i]);
+  error = addChunk(out, "tEXt", text.data, text.size);
+  ucvector_cleanup(&text);
+
+  return error;
+}
+
+static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* textstring,
+                              LodePNGCompressSettings* zlibsettings)
+{
+  unsigned error = 0;
+  ucvector data, compressed;
+  size_t i, textsize = strlen(textstring);
+
+  ucvector_init(&data);
+  ucvector_init(&compressed);
+  for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]);
+  ucvector_push_back(&data, 0); /*0 termination char*/
+  ucvector_push_back(&data, 0); /*compression method: 0*/
+
+  error = lodepng_zlib_compress(&compressed.data, &compressed.size,
+                                (unsigned char*)textstring, textsize, zlibsettings);
+  if(!error)
+  {
+    for(i = 0; i < compressed.size; i++) ucvector_push_back(&data, compressed.data[i]);
+    error = addChunk(out, "zTXt", data.data, data.size);
+  }
+
+  ucvector_cleanup(&compressed);
+  ucvector_cleanup(&data);
+  return error;
+}
+
+static unsigned addChunk_iTXt(ucvector* out, unsigned compressed, const char* keyword, const char* langtag,
+                              const char* transkey, const char* textstring, LodePNGCompressSettings* zlibsettings)
+{
+  unsigned error = 0;
+  ucvector data;
+  size_t i, textsize = strlen(textstring);
+
+  ucvector_init(&data);
+
+  for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]);
+  ucvector_push_back(&data, 0); /*null termination char*/
+  ucvector_push_back(&data, compressed ? 1 : 0); /*compression flag*/
+  ucvector_push_back(&data, 0); /*compression method*/
+  for(i = 0; langtag[i] != 0; i++) ucvector_push_back(&data, (unsigned char)langtag[i]);
+  ucvector_push_back(&data, 0); /*null termination char*/
+  for(i = 0; transkey[i] != 0; i++) ucvector_push_back(&data, (unsigned char)transkey[i]);
+  ucvector_push_back(&data, 0); /*null termination char*/
+
+  if(compressed)
+  {
+    ucvector compressed_data;
+    ucvector_init(&compressed_data);
+    error = lodepng_zlib_compress(&compressed_data.data, &compressed_data.size,
+                                  (unsigned char*)textstring, textsize, zlibsettings);
+    if(!error)
+    {
+      for(i = 0; i < compressed_data.size; i++) ucvector_push_back(&data, compressed_data.data[i]);
+    }
+    ucvector_cleanup(&compressed_data);
+  }
+  else /*not compressed*/
+  {
+    for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&data, (unsigned char)textstring[i]);
+  }
+
+  if(!error) error = addChunk(out, "iTXt", data.data, data.size);
+  ucvector_cleanup(&data);
+  return error;
+}
+
+static unsigned addChunk_bKGD(ucvector* out, const LodePNGInfo* info)
+{
+  unsigned error = 0;
+  ucvector bKGD;
+  ucvector_init(&bKGD);
+  if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA)
+  {
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256));
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256));
+  }
+  else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA)
+  {
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256));
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256));
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_g / 256));
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_g % 256));
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_b / 256));
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_b % 256));
+  }
+  else if(info->color.colortype == LCT_PALETTE)
+  {
+    ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); /*palette index*/
+  }
+
+  error = addChunk(out, "bKGD", bKGD.data, bKGD.size);
+  ucvector_cleanup(&bKGD);
+
+  return error;
+}
+
+static unsigned addChunk_tIME(ucvector* out, const LodePNGTime* time)
+{
+  unsigned error = 0;
+  unsigned char* data = (unsigned char*)mymalloc(7);
+  if(!data) return 83; /*alloc fail*/
+  data[0] = (unsigned char)(time->year / 256);
+  data[1] = (unsigned char)(time->year % 256);
+  data[2] = time->month;
+  data[3] = time->day;
+  data[4] = time->hour;
+  data[5] = time->minute;
+  data[6] = time->second;
+  error = addChunk(out, "tIME", data, 7);
+  myfree(data);
+  return error;
+}
+
+static unsigned addChunk_pHYs(ucvector* out, const LodePNGInfo* info)
+{
+  unsigned error = 0;
+  ucvector data;
+  ucvector_init(&data);
+
+  lodepng_add32bitInt(&data, info->phys_x);
+  lodepng_add32bitInt(&data, info->phys_y);
+  ucvector_push_back(&data, info->phys_unit);
+
+  error = addChunk(out, "pHYs", data.data, data.size);
+  ucvector_cleanup(&data);
+
+  return error;
+}
+
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+static void filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline,
+                           size_t length, size_t bytewidth, unsigned char filterType)
+{
+  size_t i;
+  switch(filterType)
+  {
+    case 0: /*None*/
+      for(i = 0; i < length; i++) out[i] = scanline[i];
+      break;
+    case 1: /*Sub*/
+      if(prevline)
+      {
+        for(i = 0; i < bytewidth; i++) out[i] = scanline[i];
+        for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth];
+      }
+      else
+      {
+        for(i = 0; i < bytewidth; i++) out[i] = scanline[i];
+        for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth];
+      }
+      break;
+    case 2: /*Up*/
+      if(prevline)
+      {
+        for(i = 0; i < length; i++) out[i] = scanline[i] - prevline[i];
+      }
+      else
+      {
+        for(i = 0; i < length; i++) out[i] = scanline[i];
+      }
+      break;
+    case 3: /*Average*/
+      if(prevline)
+      {
+        for(i = 0; i < bytewidth; i++) out[i] = scanline[i] - prevline[i] / 2;
+        for(i = bytewidth; i < length; i++) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) / 2);
+      }
+      else
+      {
+        for(i = 0; i < bytewidth; i++) out[i] = scanline[i];
+        for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth] / 2;
+      }
+      break;
+    case 4: /*Paeth*/
+      if(prevline)
+      {
+        /*paethPredictor(0, prevline[i], 0) is always prevline[i]*/
+        for(i = 0; i < bytewidth; i++) out[i] = (scanline[i] - prevline[i]);
+        for(i = bytewidth; i < length; i++)
+        {
+          out[i] = (scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidth]));
+        }
+      }
+      else
+      {
+        for(i = 0; i < bytewidth; i++) out[i] = scanline[i];
+        /*paethPredictor(scanline[i - bytewidth], 0, 0) is always scanline[i - bytewidth]*/
+        for(i = bytewidth; i < length; i++) out[i] = (scanline[i] - scanline[i - bytewidth]);
+      }
+      break;
+    default: return; /*unexisting filter type given*/
+  }
+}
+
+static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h,
+                       const LodePNGColorMode* info, const LodePNGEncoderSettings* settings)
+{
+  /*
+  For PNG filter method 0
+  out must be a buffer with as size: h + (w * h * bpp + 7) / 8, because there are
+  the scanlines with 1 extra byte per scanline
+  */
+
+  unsigned bpp = lodepng_get_bpp(info);
+  /*the width of a scanline in bytes, not including the filter type*/
+  size_t linebytes = (w * bpp + 7) / 8;
+  /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/
+  size_t bytewidth = (bpp + 7) / 8;
+  const unsigned char* prevline = 0;
+  unsigned x, y;
+  unsigned error = 0;
+  /*
+  There is a heuristic called the minimum sum of absolute differences heuristic, suggested by the PNG standard:
+   *  If the image type is Palette, or the bit depth is smaller than 8, then do not filter the image (i.e.
+      use fixed filtering, with the filter None).
+   * (The other case) If the image type is Grayscale or RGB (with or without Alpha), and the bit depth is
+     not smaller than 8, then use adaptive filtering heuristic as follows: independently for each row, apply
+     all five filters and select the filter that produces the smallest sum of absolute values per row.
+   This heuristic is used if filter strategy is LFS_HEURISTIC. Parts of it are used for filter strategies
+   LFS_MINSUM and LFS_ZERO.
+  */
+  int heuristic_zero = info->colortype == LCT_PALETTE || info->bitdepth < 8;
+
+  if(bpp == 0) return 31; /*error: invalid color type*/
+
+  if((!heuristic_zero && settings->filter_strategy == LFS_HEURISTIC)||
+      settings->filter_strategy == LFS_MINSUM)
+  {
+    /*adaptive filtering*/
+    size_t sum[5];
+    ucvector attempt[5]; /*five filtering attempts, one for each filter type*/
+    size_t smallest = 0;
+    unsigned type, bestType = 0;
+
+    for(type = 0; type < 5; type++) ucvector_init(&attempt[type]);
+
+    for(type = 0; type < 5; type++)
+    {
+      if(!ucvector_resize(&attempt[type], linebytes)) ERROR_BREAK(83 /*alloc fail*/);
+    }
+
+    if(!error)
+    {
+      for(y = 0; y < h; y++)
+      {
+        /*try the 5 filter types*/
+        for(type = 0; type < 5; type++)
+        {
+          filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type);
+
+          /*calculate the sum of the result*/
+          sum[type] = 0;
+          /*note that not all pixels are checked to speed this up while still having probably the best choice*/
+          for(x = 0; x < attempt[type].size; x+=3)
+          {
+            /*For differences, each byte should be treated as signed, values above 127 are negative
+            (converted to signed char). Filtertype 0 isn't a difference though, so use unsigned there.
+            This means filtertype 0 is almost never chosen, but that is justified.*/
+            if(type == 0) sum[type] += (unsigned char)(attempt[type].data[x]);
+            else
+            {
+              signed char s = (signed char)(attempt[type].data[x]);
+              sum[type] += s < 0 ? -s : s;
+            }
+          }
+
+          /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/
+          if(type == 0 || sum[type] < smallest)
+          {
+            bestType = type;
+            smallest = sum[type];
+          }
+        }
+
+        prevline = &in[y * linebytes];
+
+        /*now fill the out values*/
+        out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/
+        for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x];
+      }
+    }
+
+    for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]);
+  }
+  else if((heuristic_zero && settings->filter_strategy == LFS_HEURISTIC)||
+      settings->filter_strategy == LFS_ZERO)
+  {
+    for(y = 0; y < h; y++)
+    {
+      size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/
+      size_t inindex = linebytes * y;
+      const unsigned TYPE = 0;
+      out[outindex] = TYPE; /*filter type byte*/
+      filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, TYPE);
+      prevline = &in[inindex];
+    }
+  }
+  else if(settings->filter_strategy == LFS_PREDEFINED)
+  {
+    for(y = 0; y < h; y++)
+    {
+      size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/
+      size_t inindex = linebytes * y;
+      unsigned type = settings->predefined_filters[y];
+      out[outindex] = type; /*filter type byte*/
+      filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type);
+      prevline = &in[inindex];
+    }
+  }
+  else /*LFS_BRUTE_FORCE*/
+  {
+    /*brute force filter chooser.
+    deflate the scanline after every filter attempt to see which one deflates best.
+    This is very slow and gives only slightly smaller, sometimes even larger, result*/
+    size_t size[5];
+    ucvector attempt[5]; /*five filtering attempts, one for each filter type*/
+    size_t smallest = 0;
+    unsigned type = 0, bestType = 0;
+    unsigned char* dummy;
+    LodePNGCompressSettings zlibsettings = settings->zlibsettings;
+    /*use fixed tree on the attempts so that the tree is not adapted to the filtertype on purpose,
+    to simulate the true case where the tree is the same for the whole image. Sometimes it gives
+    better result with dynamic tree anyway. Using the fixed tree sometimes gives worse, but in rare
+    cases better compression. It does make this a bit less slow, so it's worth doing this.*/
+    zlibsettings.btype = 1;
+    /*a custom encoder likely doesn't read the btype setting and is optimized for complete PNG
+    images only, so disable it*/
+    zlibsettings.custom_encoder = 0;
+    for(type = 0; type < 5; type++)
+    {
+      ucvector_init(&attempt[type]);
+      ucvector_resize(&attempt[type], linebytes); /*todo: give error if resize failed*/
+    }
+    for(y = 0; y < h; y++) /*try the 5 filter types*/
+    {
+      for(type = 0; type < 5; type++)
+      {
+        unsigned testsize = attempt[type].size;
+        /*if(testsize > 8) testsize /= 8;*/ /*it already works good enough by testing a part of the row*/
+
+        filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type);
+        size[type] = 0;
+        dummy = 0;
+        lodepng_zlib_compress(&dummy, &size[type], attempt[type].data, testsize, &zlibsettings);
+        myfree(dummy);
+        /*check if this is smallest size (or if type == 0 it's the first case so always store the values)*/
+        if(type == 0 || size[type] < smallest)
+        {
+          bestType = type;
+          smallest = size[type];
+        }
+      }
+      prevline = &in[y * linebytes];
+      out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/
+      for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x];
+    }
+    for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]);
+  }
+
+  return error;
+}
+
+static void addPaddingBits(unsigned char* out, const unsigned char* in,
+                           size_t olinebits, size_t ilinebits, unsigned h)
+{
+  /*The opposite of the removePaddingBits function
+  olinebits must be >= ilinebits*/
+  unsigned y;
+  size_t diff = olinebits - ilinebits;
+  size_t obp = 0, ibp = 0; /*bit pointers*/
+  for(y = 0; y < h; y++)
+  {
+    size_t x;
+    for(x = 0; x < ilinebits; x++)
+    {
+      unsigned char bit = readBitFromReversedStream(&ibp, in);
+      setBitOfReversedStream(&obp, out, bit);
+    }
+    /*obp += diff; --> no, fill in some value in the padding bits too, to avoid
+    "Use of uninitialised value of size ###" warning from valgrind*/
+    for(x = 0; x < diff; x++) setBitOfReversedStream(&obp, out, 0);
+  }
+}
+
+static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp)
+{
+  /*Note: this function works on image buffers WITHOUT padding bits at end of scanlines with non-multiple-of-8
+  bit amounts, only between reduced images is padding*/
+  unsigned passw[7], passh[7];
+  size_t filter_passstart[8], padded_passstart[8], passstart[8];
+  unsigned i;
+
+  Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
+
+  if(bpp >= 8)
+  {
+    for(i = 0; i < 7; i++)
+    {
+      unsigned x, y, b;
+      size_t bytewidth = bpp / 8;
+      for(y = 0; y < passh[i]; y++)
+      for(x = 0; x < passw[i]; x++)
+      {
+        size_t pixelinstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth;
+        size_t pixeloutstart = passstart[i] + (y * passw[i] + x) * bytewidth;
+        for(b = 0; b < bytewidth; b++)
+        {
+          out[pixeloutstart + b] = in[pixelinstart + b];
+        }
+      }
+    }
+  }
+  else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/
+  {
+    for(i = 0; i < 7; i++)
+    {
+      unsigned x, y, b;
+      unsigned ilinebits = bpp * passw[i];
+      unsigned olinebits = bpp * w;
+      size_t obp, ibp; /*bit pointers (for out and in buffer)*/
+      for(y = 0; y < passh[i]; y++)
+      for(x = 0; x < passw[i]; x++)
+      {
+        ibp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp;
+        obp = (8 * passstart[i]) + (y * ilinebits + x * bpp);
+        for(b = 0; b < bpp; b++)
+        {
+          unsigned char bit = readBitFromReversedStream(&ibp, in);
+          setBitOfReversedStream(&obp, out, bit);
+        }
+      }
+    }
+  }
+}
+
+/*out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image.
+return value is error**/
+static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const unsigned char* in,
+                                    unsigned w, unsigned h,
+                                    const LodePNGInfo* info_png, const LodePNGEncoderSettings* settings)
+{
+  /*
+  This function converts the pure 2D image with the PNG's colortype, into filtered-padded-interlaced data. Steps:
+  *) if no Adam7: 1) add padding bits (= posible extra bits per scanline if bpp < 8) 2) filter
+  *) if adam7: 1) Adam7_interlace 2) 7x add padding bits 3) 7x filter
+  */
+  unsigned bpp = lodepng_get_bpp(&info_png->color);
+  unsigned error = 0;
+
+  if(info_png->interlace_method == 0)
+  {
+    *outsize = h + (h * ((w * bpp + 7) / 8)); /*image size plus an extra byte per scanline + possible padding bits*/
+    *out = (unsigned char*)mymalloc(*outsize);
+    if(!(*out) && (*outsize)) error = 83; /*alloc fail*/
+
+    if(!error)
+    {
+      /*non multiple of 8 bits per scanline, padding bits needed per scanline*/
+      if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8)
+      {
+        ucvector padded;
+        ucvector_init(&padded);
+        if(!ucvector_resize(&padded, h * ((w * bpp + 7) / 8))) error = 83; /*alloc fail*/
+        if(!error)
+        {
+          addPaddingBits(padded.data, in, ((w * bpp + 7) / 8) * 8, w * bpp, h);
+          error = filter(*out, padded.data, w, h, &info_png->color, settings);
+        }
+        ucvector_cleanup(&padded);
+      }
+      else
+      {
+        /*we can immediatly filter into the out buffer, no other steps needed*/
+        error = filter(*out, in, w, h, &info_png->color, settings);
+      }
+    }
+  }
+  else /*interlace_method is 1 (Adam7)*/
+  {
+    unsigned char* adam7 = (unsigned char*)mymalloc((h * w * bpp + 7) / 8);
+    if(!adam7 && ((h * w * bpp + 7) / 8)) error = 83; /*alloc fail*/
+
+    while(!error) /*not a real while loop, used to break out to cleanup to avoid a goto*/
+    {
+      unsigned passw[7], passh[7];
+      size_t filter_passstart[8], padded_passstart[8], passstart[8];
+      unsigned i;
+
+      Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
+
+      *outsize = filter_passstart[7]; /*image size plus an extra byte per scanline + possible padding bits*/
+      *out = (unsigned char*)mymalloc(*outsize);
+      if(!(*out) && (*outsize)) ERROR_BREAK(83 /*alloc fail*/);
+
+      Adam7_interlace(adam7, in, w, h, bpp);
+
+      for(i = 0; i < 7; i++)
+      {
+        if(bpp < 8)
+        {
+          ucvector padded;
+          ucvector_init(&padded);
+          if(!ucvector_resize(&padded, h * ((w * bpp + 7) / 8))) error = 83; /*alloc fail*/
+          if(!error)
+          {
+            addPaddingBits(&padded.data[padded_passstart[i]], &adam7[passstart[i]],
+                           ((passw[i] * bpp + 7) / 8) * 8, passw[i] * bpp, passh[i]);
+            error = filter(&(*out)[filter_passstart[i]], &padded.data[padded_passstart[i]],
+                           passw[i], passh[i], &info_png->color, settings);
+          }
+
+          ucvector_cleanup(&padded);
+        }
+        else
+        {
+          error = filter(&(*out)[filter_passstart[i]], &adam7[padded_passstart[i]],
+                         passw[i], passh[i], &info_png->color, settings);
+        }
+      }
+
+      break;
+    }
+
+    myfree(adam7);
+  }
+
+  return error;
+}
+
+/*
+palette must have 4 * palettesize bytes allocated, and given in format RGBARGBARGBARGBA...
+returns 0 if the palette is opaque,
+returns 1 if the palette has a single color with alpha 0 ==> color key
+returns 2 if the palette is semi-translucent.
+*/
+static unsigned getPaletteTranslucency(const unsigned char* palette, size_t palettesize)
+{
+  size_t i, key = 0;
+  unsigned r, g, b; /*the value of the color with alpha 0, so long as color keying is possible*/
+  for(i = 0; i < palettesize; i++)
+  {
+    if(!key && palette[4 * i + 3] == 0)
+    {
+      r = palette[4 * i + 0]; g = palette[4 * i + 1]; b = palette[4 * i + 2];
+      key = 1;
+      i = (size_t)(-1); /*restart from beginning, to detect earlier opaque colors with key's value*/
+    }
+    else if(palette[4 * i + 3] != 255) return 2;
+    /*when key, no opaque RGB may have key's RGB*/
+    else if(key && r == palette[i * 4 + 0] && g == palette[i * 4 + 1] && b == palette[i * 4 + 2]) return 2;
+  }
+  return key;
+}
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize)
+{
+  unsigned char* inchunk = data;
+  while((size_t)(inchunk - data) < datasize)
+  {
+    CERROR_TRY_RETURN(lodepng_chunk_append(&out->data, &out->size, inchunk));
+    out->allocsize = out->size; /*fix the allocsize again*/
+    inchunk = lodepng_chunk_next(inchunk);
+  }
+  return 0;
+}
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+unsigned lodepng_encode(unsigned char** out, size_t* outsize,
+                        const unsigned char* image, unsigned w, unsigned h,
+                        LodePNGState* state)
+{
+  LodePNGInfo info;
+  ucvector outv;
+  unsigned char* data = 0; /*uncompressed version of the IDAT chunk data*/
+  size_t datasize = 0;
+
+  /*provide some proper output values if error will happen*/
+  *out = 0;
+  *outsize = 0;
+  state->error = 0;
+
+  lodepng_info_init(&info);
+  lodepng_info_copy(&info, &state->info_png);
+
+  if((info.color.colortype == LCT_PALETTE || state->encoder.force_palette)
+      && (info.color.palettesize == 0 || info.color.palettesize > 256))
+  {
+    state->error = 68; /*invalid palette size, it is only allowed to be 1-256*/
+    return state->error;
+  }
+
+  if(state->encoder.auto_convert != LAC_NO)
+  {
+    state->error = doAutoChooseColor(&info.color, image, w, h, &state->info_raw,
+                                     state->encoder.auto_convert);
+  }
+  if(state->error) return state->error;
+
+  if(state->encoder.zlibsettings.windowsize > 32768)
+  {
+    CERROR_RETURN_ERROR(state->error, 60); /*error: windowsize larger than allowed*/
+  }
+  if(state->encoder.zlibsettings.btype > 2)
+  {
+    CERROR_RETURN_ERROR(state->error, 61); /*error: unexisting btype*/
+  }
+  if(state->info_png.interlace_method > 1)
+  {
+    CERROR_RETURN_ERROR(state->error, 71); /*error: unexisting interlace mode*/
+  }
+  /*error: unexisting color type given*/
+  if((state->error = checkColorValidity(info.color.colortype, info.color.bitdepth))) return state->error;
+  /*error: unexisting color type given*/
+  if((state->error = checkColorValidity(state->info_raw.colortype, state->info_raw.bitdepth))) return state->error;
+
+  if(!lodepng_color_mode_equal(&state->info_raw, &info.color))
+  {
+    unsigned char* converted;
+    size_t size = (w * h * lodepng_get_bpp(&info.color) + 7) / 8;
+
+    converted = (unsigned char*)mymalloc(size);
+    if(!converted && size) state->error = 83; /*alloc fail*/
+    if(!state->error)
+    {
+      state->error = lodepng_convert(converted, image, &info.color, &state->info_raw, w, h);
+    }
+    if(!state->error) preProcessScanlines(&data, &datasize, converted, w, h, &info, &state->encoder);
+    myfree(converted);
+  }
+  else preProcessScanlines(&data, &datasize, image, w, h, &info, &state->encoder);
+
+  ucvector_init(&outv);
+  while(!state->error) /*while only executed once, to break on error*/
+  {
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    size_t i;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    /*write signature and chunks*/
+    writeSignature(&outv);
+    /*IHDR*/
+    addChunk_IHDR(&outv, w, h, info.color.colortype, info.color.bitdepth, info.interlace_method);
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    /*unknown chunks between IHDR and PLTE*/
+    if(info.unknown_chunks_data[0])
+    {
+      state->error = addUnknownChunks(&outv, info.unknown_chunks_data[0], info.unknown_chunks_size[0]);
+      if(state->error) break;
+    }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    /*PLTE*/
+    if(info.color.colortype == LCT_PALETTE)
+    {
+      addChunk_PLTE(&outv, &info.color);
+    }
+    if(state->encoder.force_palette && (info.color.colortype == LCT_RGB || info.color.colortype == LCT_RGBA))
+    {
+      addChunk_PLTE(&outv, &info.color);
+    }
+    /*tRNS*/
+    if(info.color.colortype == LCT_PALETTE && getPaletteTranslucency(info.color.palette, info.color.palettesize) != 0)
+    {
+      addChunk_tRNS(&outv, &info.color);
+    }
+    if((info.color.colortype == LCT_GREY || info.color.colortype == LCT_RGB) && info.color.key_defined)
+    {
+      addChunk_tRNS(&outv, &info.color);
+    }
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    /*bKGD (must come between PLTE and the IDAt chunks*/
+    if(info.background_defined) addChunk_bKGD(&outv, &info);
+    /*pHYs (must come before the IDAT chunks)*/
+    if(info.phys_defined) addChunk_pHYs(&outv, &info);
+
+    /*unknown chunks between PLTE and IDAT*/
+    if(info.unknown_chunks_data[1])
+    {
+      state->error = addUnknownChunks(&outv, info.unknown_chunks_data[1], info.unknown_chunks_size[1]);
+      if(state->error) break;
+    }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    /*IDAT (multiple IDAT chunks must be consecutive)*/
+    state->error = addChunk_IDAT(&outv, data, datasize, &state->encoder.zlibsettings);
+    if(state->error) break;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    /*tIME*/
+    if(info.time_defined) addChunk_tIME(&outv, &info.time);
+    /*tEXt and/or zTXt*/
+    for(i = 0; i < info.text_num; i++)
+    {
+      if(strlen(info.text_keys[i]) > 79)
+      {
+        state->error = 66; /*text chunk too large*/
+        break;
+      }
+      if(strlen(info.text_keys[i]) < 1)
+      {
+        state->error = 67; /*text chunk too small*/
+        break;
+      }
+      if(state->encoder.text_compression)
+        addChunk_zTXt(&outv, info.text_keys[i], info.text_strings[i], &state->encoder.zlibsettings);
+      else
+        addChunk_tEXt(&outv, info.text_keys[i], info.text_strings[i]);
+    }
+    /*LodePNG version id in text chunk*/
+    if(state->encoder.add_id)
+    {
+      unsigned alread_added_id_text = 0;
+      for(i = 0; i < info.text_num; i++)
+      {
+        if(!strcmp(info.text_keys[i], "LodePNG"))
+        {
+          alread_added_id_text = 1;
+          break;
+        }
+      }
+      if(alread_added_id_text == 0)
+        addChunk_tEXt(&outv, "LodePNG", VERSION_STRING); /*it's shorter as tEXt than as zTXt chunk*/
+    }
+    /*iTXt*/
+    for(i = 0; i < info.itext_num; i++)
+    {
+      if(strlen(info.itext_keys[i]) > 79)
+      {
+        state->error = 66; /*text chunk too large*/
+        break;
+      }
+      if(strlen(info.itext_keys[i]) < 1)
+      {
+        state->error = 67; /*text chunk too small*/
+        break;
+      }
+      addChunk_iTXt(&outv, state->encoder.text_compression,
+                    info.itext_keys[i], info.itext_langtags[i], info.itext_transkeys[i], info.itext_strings[i],
+                    &state->encoder.zlibsettings);
+    }
+
+    /*unknown chunks between IDAT and IEND*/
+    if(info.unknown_chunks_data[2])
+    {
+      state->error = addUnknownChunks(&outv, info.unknown_chunks_data[2], info.unknown_chunks_size[2]);
+      if(state->error) break;
+    }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    /*IEND*/
+    addChunk_IEND(&outv);
+
+    break; /*this isn't really a while loop; no error happened so break out now!*/
+  }
+
+  lodepng_info_cleanup(&info);
+  myfree(data);
+  /*instead of cleaning the vector up, give it to the output*/
+  *out = outv.data;
+  *outsize = outv.size;
+
+  return state->error;
+}
+
+unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, const unsigned char* image,
+                               unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth)
+{
+  unsigned error;
+  LodePNGState state;
+  lodepng_state_init(&state);
+  state.info_raw.colortype = colortype;
+  state.info_raw.bitdepth = bitdepth;
+  state.info_png.color.colortype = colortype;
+  state.info_png.color.bitdepth = bitdepth;
+  lodepng_encode(out, outsize, image, w, h, &state);
+  error = state.error;
+  lodepng_state_cleanup(&state);
+  return error;
+}
+
+unsigned lodepng_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h)
+{
+  return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGBA, 8);
+}
+
+unsigned lodepng_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h)
+{
+  return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGB, 8);
+}
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned lodepng_encode_file(const char* filename, const unsigned char* image, unsigned w, unsigned h,
+                             LodePNGColorType colortype, unsigned bitdepth)
+{
+  unsigned char* buffer;
+  size_t buffersize;
+  unsigned error = lodepng_encode_memory(&buffer, &buffersize, image, w, h, colortype, bitdepth);
+  if(!error) error = lodepng_save_file(buffer, buffersize, filename);
+  myfree(buffer);
+  return error;
+}
+
+unsigned lodepng_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h)
+{
+  return lodepng_encode_file(filename, image, w, h, LCT_RGBA, 8);
+}
+
+unsigned lodepng_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h)
+{
+  return lodepng_encode_file(filename, image, w, h, LCT_RGB, 8);
+}
+#endif /*LODEPNG_COMPILE_DISK*/
+
+void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings)
+{
+  lodepng_compress_settings_init(&settings->zlibsettings);
+  settings->filter_strategy = LFS_HEURISTIC;
+  settings->auto_convert = LAC_AUTO;
+  settings->force_palette = 0;
+  settings->predefined_filters = 0;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  settings->add_id = 0;
+  settings->text_compression = 1;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+}
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+#ifdef LODEPNG_COMPILE_ERROR_TEXT
+/*
+This returns the description of a numerical error code in English. This is also
+the documentation of all the error codes.
+*/
+const char* lodepng_error_text(unsigned code)
+{
+  switch(code)
+  {
+    case 0: return "no error, everything went ok";
+    case 1: return "nothing done yet"; /*the Encoder/Decoder has done nothing yet, error checking makes no sense yet*/
+    case 10: return "end of input memory reached without huffman end code"; /*while huffman decoding*/
+    case 11: return "error in code tree made it jump outside of huffman tree"; /*while huffman decoding*/
+    case 13: return "problem while processing dynamic deflate block";
+    case 14: return "problem while processing dynamic deflate block";
+    case 15: return "problem while processing dynamic deflate block";
+    case 16: return "unexisting code while processing dynamic deflate block";
+    case 17: return "end of out buffer memory reached while inflating";
+    case 18: return "invalid distance code while inflating";
+    case 19: return "end of out buffer memory reached while inflating";
+    case 20: return "invalid deflate block BTYPE encountered while decoding";
+    case 21: return "NLEN is not ones complement of LEN in a deflate block";
+
+     /*end of out buffer memory reached while inflating:
+     This can happen if the inflated deflate data is longer than the amount of bytes required to fill up
+     all the pixels of the image, given the color depth and image dimensions. Something that doesn't
+     happen in a normal, well encoded, PNG image.*/
+    case 22: return "end of out buffer memory reached while inflating";
+
+    case 23: return "end of in buffer memory reached while inflating";
+    case 24: return "invalid FCHECK in zlib header";
+    case 25: return "invalid compression method in zlib header";
+    case 26: return "FDICT encountered in zlib header while it's not used for PNG";
+    case 27: return "PNG file is smaller than a PNG header";
+    /*Checks the magic file header, the first 8 bytes of the PNG file*/
+    case 28: return "incorrect PNG signature, it's no PNG or corrupted";
+    case 29: return "first chunk is not the header chunk";
+    case 30: return "chunk length too large, chunk broken off at end of file";
+    case 31: return "illegal PNG color type or bpp";
+    case 32: return "illegal PNG compression method";
+    case 33: return "illegal PNG filter method";
+    case 34: return "illegal PNG interlace method";
+    case 35: return "chunk length of a chunk is too large or the chunk too small";
+    case 36: return "illegal PNG filter type encountered";
+    case 37: return "illegal bit depth for this color type given";
+    case 38: return "the palette is too big"; /*more than 256 colors*/
+    case 39: return "more palette alpha values given in tRNS chunk than there are colors in the palette";
+    case 40: return "tRNS chunk has wrong size for greyscale image";
+    case 41: return "tRNS chunk has wrong size for RGB image";
+    case 42: return "tRNS chunk appeared while it was not allowed for this color type";
+    case 43: return "bKGD chunk has wrong size for palette image";
+    case 44: return "bKGD chunk has wrong size for greyscale image";
+    case 45: return "bKGD chunk has wrong size for RGB image";
+    /*Is the palette too small?*/
+    case 46: return "a value in indexed image is larger than the palette size (bitdepth = 8)";
+    /*Is the palette too small?*/
+    case 47: return "a value in indexed image is larger than the palette size (bitdepth < 8)";
+    /*the input data is empty, maybe a PNG file doesn't exist or is in the wrong path*/
+    case 48: return "empty input or file doesn't exist";
+    case 49: return "jumped past memory while generating dynamic huffman tree";
+    case 50: return "jumped past memory while generating dynamic huffman tree";
+    case 51: return "jumped past memory while inflating huffman block";
+    case 52: return "jumped past memory while inflating";
+    case 53: return "size of zlib data too small";
+    case 54: return "repeat symbol in tree while there was no value symbol yet";
+
+    /*jumped past tree while generating huffman tree, this could be when the
+    tree will have more leaves than symbols after generating it out of the
+    given lenghts. They call this an oversubscribed dynamic bit lengths tree in zlib.*/
+    case 55: return "jumped past tree while generating huffman tree";
+
+    case 56: return "given output image colortype or bitdepth not supported for color conversion";
+    case 57: return "invalid CRC encountered (checking CRC can be disabled)";
+    case 58: return "invalid ADLER32 encountered (checking ADLER32 can be disabled)";
+    case 59: return "requested color conversion not supported";
+    case 60: return "invalid window size given in the settings of the encoder (must be 0-32768)";
+    case 61: return "invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed)";
+    /*LodePNG leaves the choice of RGB to greyscale conversion formula to the user.*/
+    case 62: return "conversion from color to greyscale not supported";
+    case 63: return "length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk"; /*(2^31-1)*/
+    /*this would result in the inability of a deflated block to ever contain an end code. It must be at least 1.*/
+    case 64: return "the length of the END symbol 256 in the Huffman tree is 0";
+    case 66: return "the length of a text chunk keyword given to the encoder is longer than the maximum of 79 bytes";
+    case 67: return "the length of a text chunk keyword given to the encoder is smaller than the minimum of 1 byte";
+    case 68: return "tried to encode a PLTE chunk with a palette that has less than 1 or more than 256 colors";
+    case 69: return "unknown chunk type with 'critical' flag encountered by the decoder";
+    case 71: return "unexisting interlace mode given to encoder (must be 0 or 1)";
+    case 72: return "while decoding, unexisting compression method encountering in zTXt or iTXt chunk (it must be 0)";
+    case 73: return "invalid tIME chunk size";
+    case 74: return "invalid pHYs chunk size";
+    /*length could be wrong, or data chopped off*/
+    case 75: return "no null termination char found while decoding text chunk";
+    case 76: return "iTXt chunk too short to contain required bytes";
+    case 77: return "integer overflow in buffer size";
+    case 78: return "failed to open file for reading"; /*file doesn't exist or couldn't be opened for reading*/
+    case 79: return "failed to open file for writing";
+    case 80: return "tried creating a tree of 0 symbols";
+    case 81: return "lazy matching at pos 0 is impossible";
+    case 82: return "color conversion to palette requested while a color isn't in palette";
+    case 83: return "memory allocation failed";
+    case 84: return "given image too small to contain all pixels to be encoded";
+    case 85: return "internal color conversion bug";
+    case 86: return "impossible offset in lz77 encoding (internal bug)";
+  }
+  return "unknown error code";
+}
+#endif /*LODEPNG_COMPILE_ERROR_TEXT*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* // C++ Wrapper                                                          // */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+
+#ifdef LODEPNG_COMPILE_CPP
+namespace lodepng
+{
+
+#ifdef LODEPNG_COMPILE_DISK
+void load_file(std::vector<unsigned char>& buffer, const std::string& filename)
+{
+  std::ifstream file(filename.c_str(), std::ios::in|std::ios::binary|std::ios::ate);
+
+  /*get filesize*/
+  std::streamsize size = 0;
+  if(file.seekg(0, std::ios::end).good()) size = file.tellg();
+  if(file.seekg(0, std::ios::beg).good()) size -= file.tellg();
+
+  /*read contents of the file into the vector*/
+  buffer.resize(size_t(size));
+  if(size > 0) file.read((char*)(&buffer[0]), size);
+}
+
+/*write given buffer to the file, overwriting the file, it doesn't append to it.*/
+void save_file(const std::vector<unsigned char>& buffer, const std::string& filename)
+{
+  std::ofstream file(filename.c_str(), std::ios::out|std::ios::binary);
+  file.write(buffer.empty() ? 0 : (char*)&buffer[0], std::streamsize(buffer.size()));
+}
+#endif //LODEPNG_COMPILE_DISK
+
+#ifdef LODEPNG_COMPILE_ZLIB
+#ifdef LODEPNG_COMPILE_DECODER
+unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                    const LodePNGDecompressSettings& settings)
+{
+  unsigned char* buffer = 0;
+  size_t buffersize = 0;
+  unsigned error = lodepng_zlib_decompress(&buffer, &buffersize, in, insize, &settings);
+  if(buffer)
+  {
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    myfree(buffer);
+  }
+  return error;
+}
+
+unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                    const LodePNGDecompressSettings& settings)
+{
+  return decompress(out, in.empty() ? 0 : &in[0], in.size(), settings);
+}
+#endif //LODEPNG_COMPILE_DECODER
+
+#ifdef LODEPNG_COMPILE_ENCODER
+unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                  const LodePNGCompressSettings& settings)
+{
+  unsigned char* buffer = 0;
+  size_t buffersize = 0;
+  unsigned error = lodepng_zlib_compress(&buffer, &buffersize, in, insize, &settings);
+  if(buffer)
+  {
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    myfree(buffer);
+  }
+  return error;
+}
+
+unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                  const LodePNGCompressSettings& settings)
+{
+  return compress(out, in.empty() ? 0 : &in[0], in.size(), settings);
+}
+#endif //LODEPNG_COMPILE_ENCODER
+#endif //LODEPNG_COMPILE_ZLIB
+
+
+#ifdef LODEPNG_COMPILE_PNG
+
+State::State()
+{
+  lodepng_state_init(this);
+}
+
+State::State(const State& other)
+{
+  lodepng_state_init(this);
+  lodepng_state_copy(this, &other);
+}
+
+State::~State()
+{
+  lodepng_state_cleanup(this);
+}
+
+State& State::operator=(const State& other)
+{
+  lodepng_state_copy(this, &other);
+  return *this;
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in,
+                size_t insize, LodePNGColorType colortype, unsigned bitdepth)
+{
+  unsigned char* buffer;
+  unsigned error = lodepng_decode_memory(&buffer, &w, &h, in, insize, colortype, bitdepth);
+  if(buffer && !error)
+  {
+    State state;
+    state.info_raw.colortype = colortype;
+    state.info_raw.bitdepth = bitdepth;
+    size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw);
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    myfree(buffer);
+  }
+  return error;
+}
+
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                const std::vector<unsigned char>& in, LodePNGColorType colortype, unsigned bitdepth)
+{
+  return decode(out, w, h, in.empty() ? 0 : &in[0], (unsigned)in.size(), colortype, bitdepth);
+}
+
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                State& state,
+                const unsigned char* in, size_t insize)
+{
+  unsigned char* buffer;
+  unsigned error = lodepng_decode(&buffer, &w, &h, &state, in, insize);
+  if(buffer && !error)
+  {
+    size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw);
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    myfree(buffer);
+  }
+  return error;
+}
+
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                State& state,
+                const std::vector<unsigned char>& in)
+{
+  return decode(out, w, h, state, in.empty() ? 0 : &in[0], in.size());
+}
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename,
+                LodePNGColorType colortype, unsigned bitdepth)
+{
+  std::vector<unsigned char> buffer;
+  load_file(buffer, filename);
+  return decode(out, w, h, buffer, colortype, bitdepth);
+}
+#endif //LODEPNG_COMPILE_DECODER
+#endif //LODEPNG_COMPILE_DISK
+
+#ifdef LODEPNG_COMPILE_ENCODER
+unsigned encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h,
+                LodePNGColorType colortype, unsigned bitdepth)
+{
+  unsigned char* buffer;
+  size_t buffersize;
+  unsigned error = lodepng_encode_memory(&buffer, &buffersize, in, w, h, colortype, bitdepth);
+  if(buffer)
+  {
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    myfree(buffer);
+  }
+  return error;
+}
+
+unsigned encode(std::vector<unsigned char>& out,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                LodePNGColorType colortype, unsigned bitdepth)
+{
+  if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84;
+  return encode(out, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth);
+}
+
+unsigned encode(std::vector<unsigned char>& out,
+                const unsigned char* in, unsigned w, unsigned h,
+                State& state)
+{
+  unsigned char* buffer;
+  size_t buffersize;
+  unsigned error = lodepng_encode(&buffer, &buffersize, in, w, h, &state);
+  if(buffer)
+  {
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    myfree(buffer);
+  }
+  return error;
+}
+
+unsigned encode(std::vector<unsigned char>& out,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                State& state)
+{
+  if(lodepng_get_raw_size(w, h, &state.info_raw) > in.size()) return 84;
+  return encode(out, in.empty() ? 0 : &in[0], w, h, state);
+}
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned encode(const std::string& filename,
+                const unsigned char* in, unsigned w, unsigned h,
+                LodePNGColorType colortype, unsigned bitdepth)
+{
+  std::vector<unsigned char> buffer;
+  unsigned error = encode(buffer, in, w, h, colortype, bitdepth);
+  if(!error) save_file(buffer, filename);
+  return error;
+}
+
+unsigned encode(const std::string& filename,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                LodePNGColorType colortype, unsigned bitdepth)
+{
+  if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84;
+  return encode(filename, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth);
+}
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_ENCODER
+#endif //LODEPNG_COMPILE_PNG
+} //namespace lodepng
+#endif /*LODEPNG_COMPILE_CPP*/
diff --git a/lib/lodepng.h b/lib/lodepng.h
new file mode 100644
index 0000000..50d5303
--- /dev/null
+++ b/lib/lodepng.h
@@ -0,0 +1,1640 @@
+/*
+LodePNG version 20120729
+
+Copyright (c) 2005-2012 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+#ifndef LODEPNG_H
+#define LODEPNG_H
+
+#define LODEPNG_NO_COMPILE_ENCODER
+#define LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS
+#define LODEPNG_NO_COMPILE_CPP
+#define LODEPNG_NO_COMPILE_DISK
+#define LODEPNG_NO_COMPILE_ZLIB
+#define LODEPNG_NO_COMPILE_CPP
+
+#include <string.h> /*for size_t*/
+
+#ifdef __cplusplus
+#include <vector>
+#include <string>
+#endif /*__cplusplus*/
+
+/*
+The following #defines are used to create code sections. They can be disabled
+to disable code sections, which can give faster compile time and smaller binary.
+The "NO_COMPILE" defines are designed to be used to pass as defines to the
+compiler command to disable them without modifying this header, e.g.
+-DLODEPNG_NO_COMPILE_ZLIB for gcc.
+*/
+/*deflate&zlib. If disabled, you need to define two zlib functions, see documtation of LODEPNG_CUSTOM_ZLIB_... below*/
+#ifndef LODEPNG_NO_COMPILE_ZLIB
+#define LODEPNG_COMPILE_ZLIB
+#endif
+/*png encoder and png decoder*/
+#ifndef LODEPNG_NO_COMPILE_PNG
+#define LODEPNG_COMPILE_PNG
+#endif
+/*deflate&zlib decoder and png decoder*/
+#ifndef LODEPNG_NO_COMPILE_DECODER
+#define LODEPNG_COMPILE_DECODER
+#endif
+/*deflate&zlib encoder and png encoder*/
+#ifndef LODEPNG_NO_COMPILE_ENCODER
+#define LODEPNG_COMPILE_ENCODER
+#endif
+/*the optional built in harddisk file loading and saving functions*/
+#ifndef LODEPNG_NO_COMPILE_DISK
+#define LODEPNG_COMPILE_DISK
+#endif
+/*support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks*/
+#ifndef LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS
+#define LODEPNG_COMPILE_ANCILLARY_CHUNKS
+#endif
+/*ability to convert error numerical codes to English text string*/
+#ifndef LODEPNG_NO_COMPILE_ERROR_TEXT
+#define LODEPNG_COMPILE_ERROR_TEXT
+#endif
+/*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/
+#ifdef __cplusplus
+#ifndef LODEPNG_NO_COMPILE_CPP
+#define LODEPNG_COMPILE_CPP
+#endif
+#endif
+
+/*
+custom zlib decoder (if LODEPNG_COMPILE_ZLIB is disabled, this is ignored, always treated as "1"):
+0: not custom, use LodePNG's zlib decoder
+1: allow using custom zlib decoder with a setting
+--> you must then provide following function in your source files that LodePNG will link to:
+  unsigned lodepng_custom_inflate(unsigned char**, size_t*, const unsigned char*, size_t,
+                                  const LodePNGDecompressSettings*)
+2: allow using custom deflate decoder with a setting
+--> you must then provide following function in your source files that LodePNG will link to:
+  unsigned lodepng_custom_zlib_decompress(unsigned char**, size_t*, const unsigned char*, size_t,
+                                          const LodePNGDecompressSettings*)
+*/
+#ifndef LODEPNG_OVERRIDE_CUSTOM_ZLIB_DECODER
+#define LODEPNG_CUSTOM_ZLIB_DECODER 0
+#else
+#define LODEPNG_CUSTOM_ZLIB_DECODER LODEPNG_OVERRIDE_CUSTOM_ZLIB_DECODER
+#endif
+
+/*
+custom zlib encoder (if LODEPNG_COMPILE_ZLIB is disabled, this is ignored, always treated as "1"):
+0: not custom, use LodePNG's zlib encoder
+1: allow using custom zlib encoder with a setting
+--> you must then provide following function in your source files that LodePNG will link to:
+  unsigned lodepng_custom_deflate(unsigned char**, size_t*, const unsigned char*, size_t,
+                                  const LodePNGCompressSettings*)
+2: allow using custom deflate encoder with a setting
+--> you must then provide following function in your source files that LodePNG will link to:
+  unsigned lodepng_custom_zlib_compress(unsigned char**, size_t*, const unsigned char*, size_t,
+                                        const LodePNGCompressSettings*)
+*/
+#ifndef LODEPNG_OVERRIDE_CUSTOM_ZLIB_ENCODER
+#define LODEPNG_CUSTOM_ZLIB_ENCODER 0
+#else
+#define LODEPNG_CUSTOM_ZLIB_ENCODER LODEPNG_OVERRIDE_CUSTOM_ZLIB_ENCODER
+#endif
+
+#ifdef LODEPNG_COMPILE_PNG
+/*The PNG color types (also used for raw).*/
+typedef enum LodePNGColorType
+{
+  LCT_GREY = 0, /*greyscale: 1,2,4,8,16 bit*/
+  LCT_RGB = 2, /*RGB: 8,16 bit*/
+  LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/
+  LCT_GREY_ALPHA = 4, /*greyscale with alpha: 8,16 bit*/
+  LCT_RGBA = 6 /*RGB with alpha: 8,16 bit*/
+} LodePNGColorType;
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*
+Converts PNG data in memory to raw pixel data.
+out: Output parameter. Pointer to buffer that will contain the raw pixel data.
+     After decoding, its size is w * h * (bytes per pixel) bytes larger than
+     initially. Bytes per pixel depends on colortype and bitdepth.
+     Must be freed after usage with free(*out).
+w: Output parameter. Pointer to width of pixel data.
+h: Output parameter. Pointer to height of pixel data.
+in: Memory buffer with the PNG file.
+insize: size of the in buffer.
+colortype: the desired color type for the raw output image. See explanation on PNG color types.
+bitdepth: the desired bit depth for the raw output image. See explanation on PNG color types.
+Return value: LodePNG error code (0 means no error).
+*/
+unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h,
+                               const unsigned char* in, size_t insize,
+                               LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_decode_memory, but always decodes to 32-bit RGBA raw image*/
+unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h,
+                          const unsigned char* in, size_t insize);
+
+/*Same as lodepng_decode_memory, but always decodes to 24-bit RGB raw image*/
+unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h,
+                          const unsigned char* in, size_t insize);
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Load PNG from disk, from file with given name.
+Same as the other decode functions, but instead takes a filename as input.
+*/
+unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h,
+                             const char* filename,
+                             LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_decode_file, but always decodes to 32-bit RGBA raw image.*/
+unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h,
+                               const char* filename);
+
+/*Same as lodepng_decode_file, but always decodes to 24-bit RGB raw image.*/
+unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h,
+                               const char* filename);
+#endif /*LODEPNG_COMPILE_DISK*/
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*
+Converts raw pixel data into a PNG image in memory. The colortype and bitdepth
+  of the output PNG image cannot be chosen, they are automatically determined
+  by the colortype, bitdepth and content of the input pixel data.
+out: Output parameter. Pointer to buffer that will contain the raw pixel data.
+     Must be freed after usage with free(*out).
+outsize: Output parameter. Pointer to the size in bytes of the out buffer.
+image: The raw pixel data to encode. The size of this buffer should be
+       w * h * (bytes per pixel), bytes per pixel depends on colortype and bitdepth.
+w: width of the raw pixel data in pixels.
+h: height of the raw pixel data in pixels.
+colortype: the color type of the raw input image. See explanation on PNG color types.
+bitdepth: the bit depth of the raw input image. See explanation on PNG color types.
+Return value: LodePNG error code (0 means no error).
+*/
+unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize,
+                               const unsigned char* image, unsigned w, unsigned h,
+                               LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_encode_memory, but always encodes from 32-bit RGBA raw image.*/
+unsigned lodepng_encode32(unsigned char** out, size_t* outsize,
+                          const unsigned char* image, unsigned w, unsigned h);
+
+/*Same as lodepng_encode_memory, but always encodes from 24-bit RGB raw image.*/
+unsigned lodepng_encode24(unsigned char** out, size_t* outsize,
+                          const unsigned char* image, unsigned w, unsigned h);
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Converts raw pixel data into a PNG file on disk.
+Same as the other encode functions, but instead takes a filename as output.
+NOTE: This overwrites existing files without warning!
+*/
+unsigned lodepng_encode_file(const char* filename,
+                             const unsigned char* image, unsigned w, unsigned h,
+                             LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_encode_file, but always encodes from 32-bit RGBA raw image.*/
+unsigned lodepng_encode32_file(const char* filename,
+                               const unsigned char* image, unsigned w, unsigned h);
+
+/*Same as lodepng_encode_file, but always encodes from 24-bit RGB raw image.*/
+unsigned lodepng_encode24_file(const char* filename,
+                               const unsigned char* image, unsigned w, unsigned h);
+#endif /*LODEPNG_COMPILE_DISK*/
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+
+#ifdef LODEPNG_COMPILE_CPP
+namespace lodepng
+{
+#ifdef LODEPNG_COMPILE_DECODER
+/*Same as lodepng_decode_memory, but decodes to an std::vector.*/
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                const unsigned char* in, size_t insize,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                const std::vector<unsigned char>& in,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Converts PNG file from disk to raw pixel data in memory.
+Same as the other decode functions, but instead takes a filename as input.
+*/
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                const std::string& filename,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_DECODER
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*Same as lodepng_encode_memory, but encodes to an std::vector.*/
+unsigned encode(std::vector<unsigned char>& out,
+                const unsigned char* in, unsigned w, unsigned h,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned encode(std::vector<unsigned char>& out,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Converts 32-bit RGBA raw pixel data into a PNG file on disk.
+Same as the other encode functions, but instead takes a filename as output.
+NOTE: This overwrites existing files without warning!
+*/
+unsigned encode(const std::string& filename,
+                const unsigned char* in, unsigned w, unsigned h,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned encode(const std::string& filename,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_ENCODER
+} //namespace lodepng
+#endif /*LODEPNG_COMPILE_CPP*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+#ifdef LODEPNG_COMPILE_ERROR_TEXT
+/*Returns an English description of the numerical error code.*/
+const char* lodepng_error_text(unsigned code);
+#endif /*LODEPNG_COMPILE_ERROR_TEXT*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*Settings for zlib decompression*/
+typedef struct LodePNGDecompressSettings
+{
+  unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/
+  unsigned custom_decoder; /*use custom decoder if LODEPNG_CUSTOM_ZLIB_DECODER and LODEPNG_COMPILE_ZLIB are enabled*/
+} LodePNGDecompressSettings;
+
+extern const LodePNGDecompressSettings lodepng_default_decompress_settings;
+void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+/*
+Settings for zlib compression. Tweaking these settings tweaks the balance
+between speed and compression ratio.
+*/
+typedef struct LodePNGCompressSettings /*deflate = compress*/
+{
+  /*LZ77 related settings*/
+  unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/
+  unsigned use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/
+  unsigned windowsize; /*the maximum is 32768, higher gives more compression but is slower. Typical value: 2048.*/
+  unsigned custom_encoder; /*use custom encoder if LODEPNG_CUSTOM_ZLIB_DECODER and LODEPNG_COMPILE_ZLIB are enabled*/
+} LodePNGCompressSettings;
+
+#ifdef LODEPNG_COMPILE_ENCODER
+extern const LodePNGCompressSettings lodepng_default_compress_settings;
+void lodepng_compress_settings_init(LodePNGCompressSettings* settings);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_PNG
+/*
+Color mode of an image. Contains all information required to decode the pixel
+bits to RGBA colors. This information is the same as used in the PNG file
+format, and is used both for PNG and raw image data in LodePNG.
+*/
+typedef struct LodePNGColorMode
+{
+  /*header (IHDR)*/
+  LodePNGColorType colortype; /*color type, see PNG standard or documentation further in this header file*/
+  unsigned bitdepth;  /*bits per sample, see PNG standard or documentation further in this header file*/
+
+  /*
+  palette (PLTE and tRNS)
+
+  Dynamically allocated with the colors of the palette, including alpha.
+  When encoding a PNG, to store your colors in the palette of the LodePNGColorMode, first use
+  lodepng_palette_clear, then for each color use lodepng_palette_add.
+  If you encode an image without alpha with palette, don't forget to put value 255 in each A byte of the palette.
+
+  When decoding, by default you can ignore this palette, since LodePNG already
+  fills the palette colors in the pixels of the raw RGBA output.
+
+  The palette is only supported for color type 3.
+  */
+  unsigned char* palette; /*palette in RGBARGBA... order*/
+  size_t palettesize; /*palette size in number of colors (amount of bytes is 4 * palettesize)*/
+
+  /*
+  transparent color key (tRNS)
+
+  This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit.
+  For greyscale PNGs, r, g and b will all 3 be set to the same.
+
+  When decoding, by default you can ignore this information, since LodePNG sets
+  pixels with this key to transparent already in the raw RGBA output.
+
+  The color key is only supported for color types 0 and 2.
+  */
+  unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/
+  unsigned key_r;       /*red/greyscale component of color key*/
+  unsigned key_g;       /*green component of color key*/
+  unsigned key_b;       /*blue component of color key*/
+} LodePNGColorMode;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_color_mode_init(LodePNGColorMode* info);
+void lodepng_color_mode_cleanup(LodePNGColorMode* info);
+/*return value is error code (0 means no error)*/
+unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source);
+
+void lodepng_palette_clear(LodePNGColorMode* info);
+/*add 1 color to the palette*/
+unsigned lodepng_palette_add(LodePNGColorMode* info,
+                             unsigned char r, unsigned char g, unsigned char b, unsigned char a);
+
+/*get the total amount of bits per pixel, based on colortype and bitdepth in the struct*/
+unsigned lodepng_get_bpp(const LodePNGColorMode* info);
+/*get the amount of color channels used, based on colortype in the struct.
+If a palette is used, it counts as 1 channel.*/
+unsigned lodepng_get_channels(const LodePNGColorMode* info);
+/*is it a greyscale type? (only colortype 0 or 4)*/
+unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info);
+/*has it got an alpha channel? (only colortype 2 or 6)*/
+unsigned lodepng_is_alpha_type(const LodePNGColorMode* info);
+/*has it got a palette? (only colortype 3)*/
+unsigned lodepng_is_palette_type(const LodePNGColorMode* info);
+/*only returns true if there is a palette and there is a value in the palette with alpha < 255.
+Loops through the palette to check this.*/
+unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info);
+/*
+Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image.
+Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels).
+Returns false if the image can only have opaque pixels.
+In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values,
+or if "key_defined" is true.
+*/
+unsigned lodepng_can_have_alpha(const LodePNGColorMode* info);
+/*Returns the byte size of a raw image buffer with given width, height and color mode*/
+size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color);
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+/*The information of a Time chunk in PNG.*/
+typedef struct LodePNGTime
+{
+  unsigned year;    /*2 bytes used (0-65535)*/
+  unsigned month;   /*1-12*/
+  unsigned day;     /*1-31*/
+  unsigned hour;    /*0-23*/
+  unsigned minute;  /*0-59*/
+  unsigned second;  /*0-60 (to allow for leap seconds)*/
+} LodePNGTime;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+/*Information about the PNG image, except pixels, width and height.*/
+typedef struct LodePNGInfo
+{
+  /*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/
+  unsigned compression_method;/*compression method of the original file. Always 0.*/
+  unsigned filter_method;     /*filter method of the original file*/
+  unsigned interlace_method;  /*interlace method of the original file*/
+  LodePNGColorMode color;     /*color type and bits, palette and transparency of the PNG file*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  /*
+  suggested background color chunk (bKGD)
+  This color uses the same color mode as the PNG (except alpha channel), which can be 1-bit to 16-bit.
+
+  For greyscale PNGs, r, g and b will all 3 be set to the same. When encoding
+  the encoder writes the red one. For palette PNGs: When decoding, the RGB value
+  will be stored, not a palette index. But when encoding, specify the index of
+  the palette in background_r, the other two are then ignored.
+
+  The decoder does not use this background color to edit the color of pixels.
+  */
+  unsigned background_defined; /*is a suggested background color given?*/
+  unsigned background_r;       /*red component of suggested background color*/
+  unsigned background_g;       /*green component of suggested background color*/
+  unsigned background_b;       /*blue component of suggested background color*/
+
+  /*
+  non-international text chunks (tEXt and zTXt)
+
+  The char** arrays each contain num strings. The actual messages are in
+  text_strings, while text_keys are keywords that give a short description what
+  the actual text represents, e.g. Title, Author, Description, or anything else.
+
+  A keyword is minimum 1 character and maximum 79 characters long. It's
+  discouraged to use a single line length longer than 79 characters for texts.
+
+  Don't allocate these text buffers yourself. Use the init/cleanup functions
+  correctly and use lodepng_add_text and lodepng_clear_text.
+  */
+  size_t text_num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/
+  char** text_keys; /*the keyword of a text chunk (e.g. "Comment")*/
+  char** text_strings; /*the actual text*/
+
+  /*
+  international text chunks (iTXt)
+  Similar to the non-international text chunks, but with additional strings
+  "langtags" and "transkeys".
+  */
+  size_t itext_num; /*the amount of international texts in this PNG*/
+  char** itext_keys; /*the English keyword of the text chunk (e.g. "Comment")*/
+  char** itext_langtags; /*language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag*/
+  char** itext_transkeys; /*keyword translated to the international language - UTF-8 string*/
+  char** itext_strings; /*the actual international text - UTF-8 string*/
+
+  /*time chunk (tIME)*/
+  unsigned time_defined; /*set to 1 to make the encoder generate a tIME chunk*/
+  LodePNGTime time;
+
+  /*phys chunk (pHYs)*/
+  unsigned phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/
+  unsigned phys_x; /*pixels per unit in x direction*/
+  unsigned phys_y; /*pixels per unit in y direction*/
+  unsigned phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/
+
+  /*
+  unknown chunks
+  There are 3 buffers, one for each position in the PNG where unknown chunks can appear
+  each buffer contains all unknown chunks for that position consecutively
+  The 3 buffers are the unknown chunks between certain critical chunks:
+  0: IHDR-PLTE, 1: PLTE-IDAT, 2: IDAT-IEND
+  Do not allocate or traverse this data yourself. Use the chunk traversing functions declared
+  later, such as lodepng_chunk_next and lodepng_chunk_append, to read/write this struct.
+  */
+  unsigned char* unknown_chunks_data[3];
+  size_t unknown_chunks_size[3]; /*size in bytes of the unknown chunks, given for protection*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNGInfo;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_info_init(LodePNGInfo* info);
+void lodepng_info_cleanup(LodePNGInfo* info);
+/*return value is error code (0 means no error)*/
+unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source);
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+void lodepng_clear_text(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/
+unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str); /*push back both texts at once*/
+
+void lodepng_clear_itext(LodePNGInfo* info); /*use this to clear the itexts again after you filled them in*/
+unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag,
+                           const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+/*
+Converts raw buffer from one color type to another color type, based on
+LodePNGColorMode structs to describe the input and output color type.
+See the reference manual at the end of this header file to see which color conversions are supported.
+return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported)
+The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel
+of the output color type (lodepng_get_bpp)
+*/
+unsigned lodepng_convert(unsigned char* out, const unsigned char* in,
+                         LodePNGColorMode* mode_out, LodePNGColorMode* mode_in,
+                         unsigned w, unsigned h);
+
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*
+Settings for the decoder. This contains settings for the PNG and the Zlib
+decoder, but not the Info settings from the Info structs.
+*/
+typedef struct LodePNGDecoderSettings
+{
+  LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/
+
+  unsigned ignore_crc; /*ignore CRC checksums*/
+  unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  unsigned read_text_chunks; /*if false but remember_unknown_chunks is true, they're stored in the unknown chunks*/
+  /*store all bytes from unknown chunks in the LodePNGInfo (off by default, useful for a png editor)*/
+  unsigned remember_unknown_chunks;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNGDecoderSettings;
+
+void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*automatically use color type with less bits per pixel if losslessly possible. Default: AUTO*/
+typedef enum LodePNGFilterStrategy
+{
+  LFS_HEURISTIC, /*official PNG heuristic*/
+  LFS_ZERO, /*every filter at zero*/
+  LFS_MINSUM, /*like the official PNG heuristic, but use minimal sum always, including palette and low bitdepth images*/
+  /*
+  Brute-force-search PNG filters by compressing each filter for each scanline.
+  This gives better compression, at the cost of being super slow. Experimental!
+  If you enable this, also set zlibsettings.windowsize to 32768 and choose an
+  optimal color mode for the PNG image for best compression. Default: 0 (false).
+  */
+  LFS_BRUTE_FORCE,
+  LFS_PREDEFINED /*use predefined_filters buffer: you specify the filter type for each scanline*/
+} LodePNGFilterStrategy;
+
+/*automatically use color type with less bits per pixel if losslessly possible. Default: LAC_AUTO*/
+typedef enum LodePNGAutoConvert
+{
+  LAC_NO, /*use color type user requested*/
+  LAC_ALPHA, /*use color type user requested, but if only opaque pixels and RGBA or grey+alpha, use RGB or grey*/
+  LAC_AUTO, /*use PNG color type that can losslessly represent the uncompressed image the smallest possible*/
+  /*
+  like AUTO, but do not choose 1, 2 or 4 bit per pixel types.
+  sometimes a PNG image compresses worse if less than 8 bits per pixels.
+  */
+  LAC_AUTO_NO_NIBBLES
+} LodePNGAutoConvert;
+
+
+/*Settings for the encoder.*/
+typedef struct LodePNGEncoderSettings
+{
+  LodePNGCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/
+
+  LodePNGAutoConvert auto_convert; /*how to automatically choose output PNG color type, if at all*/
+
+  LodePNGFilterStrategy filter_strategy;
+
+  /*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with
+    the same length as the amount of scanlines in the image, and each value must <= 5. You
+    have to cleanup this buffer, LodePNG will never free it.*/
+  unsigned char* predefined_filters;
+
+  /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette).
+  If colortype is 3, PLTE is _always_ created.*/
+  unsigned force_palette;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  /*add LodePNG identifier and version as a text chunk, for debugging*/
+  unsigned add_id;
+  /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/
+  unsigned text_compression;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNGEncoderSettings;
+
+void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+
+#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER)
+/*The settings, state and information for extended encoding and decoding.*/
+typedef struct LodePNGState
+{
+#ifdef LODEPNG_COMPILE_DECODER
+  LodePNGDecoderSettings decoder; /*the decoding settings*/
+#endif /*LODEPNG_COMPILE_DECODER*/
+#ifdef LODEPNG_COMPILE_ENCODER
+  LodePNGEncoderSettings encoder; /*the encoding settings*/
+#endif /*LODEPNG_COMPILE_ENCODER*/
+  LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/
+  LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/
+  unsigned error;
+#ifdef LODEPNG_COMPILE_CPP
+  //For the lodepng::State subclass.
+  virtual ~LodePNGState(){}
+#endif
+} LodePNGState;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_state_init(LodePNGState* state);
+void lodepng_state_cleanup(LodePNGState* state);
+void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source);
+#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*
+Same as lodepng_decode_memory, but uses a LodePNGState to allow custom settings and
+getting much more information about the PNG image and color mode.
+*/
+unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h,
+                        LodePNGState* state,
+                        const unsigned char* in, size_t insize);
+
+/*
+Read the PNG header, but not the actual data. This returns only the information
+that is in the header chunk of the PNG, such as width, height and color type. The
+information is placed in the info_png field of the LodePNGState.
+*/
+unsigned lodepng_inspect(unsigned* w, unsigned* h,
+                         LodePNGState* state,
+                         const unsigned char* in, size_t insize);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/
+unsigned lodepng_encode(unsigned char** out, size_t* outsize,
+                        const unsigned char* image, unsigned w, unsigned h,
+                        LodePNGState* state);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/*
+The lodepng_chunk functions are normally not needed, except to traverse the
+unknown chunks stored in the LodePNGInfo struct, or add new ones to it.
+It also allows traversing the chunks of an encoded PNG file yourself.
+
+PNG standard chunk naming conventions:
+First byte: uppercase = critical, lowercase = ancillary
+Second byte: uppercase = public, lowercase = private
+Third byte: must be uppercase
+Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy
+*/
+
+/*get the length of the data of the chunk. Total chunk length has 12 bytes more.*/
+unsigned lodepng_chunk_length(const unsigned char* chunk);
+
+/*puts the 4-byte type in null terminated string*/
+void lodepng_chunk_type(char type[5], const unsigned char* chunk);
+
+/*check if the type is the given type*/
+unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type);
+
+/*0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)*/
+unsigned char lodepng_chunk_ancillary(const unsigned char* chunk);
+
+/*0: public, 1: private (see PNG standard)*/
+unsigned char lodepng_chunk_private(const unsigned char* chunk);
+
+/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)*/
+unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk);
+
+/*get pointer to the data of the chunk, where the input points to the header of the chunk*/
+unsigned char* lodepng_chunk_data(unsigned char* chunk);
+const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk);
+
+/*returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)*/
+unsigned lodepng_chunk_check_crc(const unsigned char* chunk);
+
+/*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/
+void lodepng_chunk_generate_crc(unsigned char* chunk);
+
+/*iterate to next chunks. don't use on IEND chunk, as there is no next chunk then*/
+unsigned char* lodepng_chunk_next(unsigned char* chunk);
+const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk);
+
+/*
+Appends chunk to the data in out. The given chunk should already have its chunk header.
+The out variable and outlength are updated to reflect the new reallocated buffer.
+Returns error code (0 if it went ok)
+*/
+unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk);
+
+/*
+Appends new chunk to out. The chunk to append is given by giving its length, type
+and data separately. The type is a 4-letter string.
+The out variable and outlength are updated to reflect the new reallocated buffer.
+Returne error code (0 if it went ok)
+*/
+unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length,
+                              const char* type, const unsigned char* data);
+
+
+/*Calculate CRC32 of buffer*/
+unsigned lodepng_crc32(const unsigned char* buf, size_t len);
+#endif /*LODEPNG_COMPILE_PNG*/
+
+
+#ifdef LODEPNG_COMPILE_ZLIB
+/*
+This zlib part can be used independently to zlib compress and decompress a
+buffer. It cannot be used to create gzip files however, and it only supports the
+part of zlib that is required for PNG, it does not support dictionaries.
+*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use.*/
+unsigned lodepng_inflate(unsigned char** out, size_t* outsize,
+                         const unsigned char* in, size_t insize,
+                         const LodePNGDecompressSettings* settings);
+
+/*
+Decompresses Zlib data. Reallocates the out buffer and appends the data. The
+data must be according to the zlib specification.
+Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
+buffer and *outsize its size in bytes. out must be freed by user after usage.
+*/
+unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize,
+                                 const unsigned char* in, size_t insize,
+                                 const LodePNGDecompressSettings* settings);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*
+Compresses data with Zlib. Reallocates the out buffer and appends the data.
+Zlib adds a small header and trailer around the deflate data.
+The data is output in the format of the zlib specification.
+Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
+buffer and *outsize its size in bytes. out must be freed by user after usage.
+*/
+unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize,
+                               const unsigned char* in, size_t insize,
+                               const LodePNGCompressSettings* settings);
+
+/*
+Find length-limited Huffman code for given frequencies. This function is in the
+public interface only for tests, it's used internally by lodepng_deflate.
+*/
+unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies,
+                                      size_t numcodes, unsigned maxbitlen);
+
+/*Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use.*/
+unsigned lodepng_deflate(unsigned char** out, size_t* outsize,
+                         const unsigned char* in, size_t insize,
+                         const LodePNGCompressSettings* settings);
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+#endif /*LODEPNG_COMPILE_ZLIB*/
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Load a file from disk into buffer. The function allocates the out buffer, and
+after usage you should free it.
+out: output parameter, contains pointer to loaded buffer.
+outsize: output parameter, size of the allocated out buffer
+filename: the path to the file to load
+return value: error code (0 means ok)
+*/
+unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename);
+
+/*
+Save a file from buffer to disk. Warning, if it exists, this function overwrites
+the file without warning!
+buffer: the buffer to write
+buffersize: size of the buffer to write
+filename: the path to the file to save to
+return value: error code (0 means ok)
+*/
+unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename);
+#endif /*LODEPNG_COMPILE_DISK*/
+
+#ifdef LODEPNG_COMPILE_CPP
+//The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers.
+namespace lodepng
+{
+#ifdef LODEPNG_COMPILE_PNG
+class State : public LodePNGState
+{
+  public:
+    State();
+    State(const State& other);
+    virtual ~State();
+    State& operator=(const State& other);
+};
+
+#ifdef LODEPNG_COMPILE_DECODER
+//Same as other lodepng::decode, but using a State for more settings and information.
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                State& state,
+                const unsigned char* in, size_t insize);
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                State& state,
+                const std::vector<unsigned char>& in);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+//Same as other lodepng::encode, but using a State for more settings and information.
+unsigned encode(std::vector<unsigned char>& out,
+                const unsigned char* in, unsigned w, unsigned h,
+                State& state);
+unsigned encode(std::vector<unsigned char>& out,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                State& state);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Load a file from disk into an std::vector. If the vector is empty, then either
+the file doesn't exist or is an empty file.
+*/
+void load_file(std::vector<unsigned char>& buffer, const std::string& filename);
+
+/*
+Save the binary data in an std::vector to a file on disk. The file is overwritten
+without warning.
+*/
+void save_file(const std::vector<unsigned char>& buffer, const std::string& filename);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_PNG
+
+#ifdef LODEPNG_COMPILE_ZLIB
+#ifdef LODEPNG_COMPILE_DECODER
+//Zlib-decompress an unsigned char buffer
+unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                    const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
+
+//Zlib-decompress an std::vector
+unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                    const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
+#endif //LODEPNG_COMPILE_DECODER
+
+#ifdef LODEPNG_COMPILE_ENCODER
+//Zlib-compress an unsigned char buffer
+unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                  const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
+
+//Zlib-compress an std::vector
+unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                  const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
+#endif //LODEPNG_COMPILE_ENCODER
+#endif //LODEPNG_COMPILE_ZLIB
+} //namespace lodepng
+#endif /*LODEPNG_COMPILE_CPP*/
+
+/*
+TODO:
+[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often
+[.] check compatibility with vareous compilers  - done but needs to be redone for every newer version
+[X] converting color to 16-bit per channel types
+[ ] read all public PNG chunk types (but never let the color profile and gamma ones touch RGB values)
+[ ] make sure encoder generates no chunks with size > (2^31)-1
+[ ] partial decoding (stream processing)
+[X] let the "isFullyOpaque" function check color keys and transparent palettes too
+[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl"
+[ ] don't stop decoding on errors like 69, 57, 58 (make warnings)
+[ ] make option to choose if the raw image with non multiple of 8 bits per scanline should have padding bits or not
+[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes
+*/
+
+#endif /*LODEPNG_H inclusion guard*/
+
+/*
+LodePNG Documentation
+---------------------
+
+0. table of contents
+--------------------
+
+  1. about
+   1.1. supported features
+   1.2. features not supported
+  2. C and C++ version
+  3. security
+  4. decoding
+  5. encoding
+  6. color conversions
+    6.1. PNG color types
+    6.2. color conversions
+    6.3. padding bits
+  7. error values
+  8. chunks and PNG editing
+  9. compiler support
+  10. examples
+   10.1. decoder C++ example
+   10.2. decoder C example
+  11. changes
+  12. contact information
+
+
+1. about
+--------
+
+PNG is a file format to store raster images losslessly with good compression,
+supporting different color types and alpha channel.
+
+LodePNG is a PNG codec according to the Portable Network Graphics (PNG)
+Specification (Second Edition) - W3C Recommendation 10 November 2003.
+
+The specifications used are:
+
+*) Portable Network Graphics (PNG) Specification (Second Edition):
+     http://www.w3.org/TR/2003/REC-PNG-20031110
+*) RFC 1950 ZLIB Compressed Data Format version 3.3:
+     http://www.gzip.org/zlib/rfc-zlib.html
+*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3:
+     http://www.gzip.org/zlib/rfc-deflate.html
+
+The most recent version of LodePNG can currently be found at
+http://lodev.org/lodepng/
+
+LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds
+extra functionality.
+
+LodePNG exists out of two files:
+-lodepng.h: the header file for both C and C++
+-lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage
+
+If you want to start using LodePNG right away without reading this doc, get the
+examples from the LodePNG website to see how to use it in code, or check the
+smaller examples in chapter 13 here.
+
+LodePNG is simple but only supports the basic requirements. To achieve
+simplicity, the following design choices were made: There are no dependencies
+on any external library. There are functions to decode and encode a PNG with
+a single function call, and extended versions of these functions taking a
+LodePNGState struct allowing to specify or get more information. By default
+the colors of the raw image are always RGB or RGBA, no matter what color type
+the PNG file uses. To read and write files, there are simple functions to
+convert the files to/from buffers in memory.
+
+This all makes LodePNG suitable for loading textures in games, demos and small
+programs, ... It's less suitable for full fledged image editors, loading PNGs
+over network (it requires all the image data to be available before decoding can
+begin), life-critical systems, ...
+
+1.1. supported features
+-----------------------
+
+The following features are supported by the decoder:
+
+*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image,
+   or the same color type as the PNG
+*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image
+*) Adam7 interlace and deinterlace for any color type
+*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk
+*) support for alpha channels, including RGBA color model, translucent palettes and color keying
+*) zlib decompression (inflate)
+*) zlib compression (deflate)
+*) CRC32 and ADLER32 checksums
+*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks.
+*) the following chunks are supported (generated/interpreted) by both encoder and decoder:
+    IHDR: header information
+    PLTE: color palette
+    IDAT: pixel data
+    IEND: the final chunk
+    tRNS: transparency for palettized images
+    tEXt: textual information
+    zTXt: compressed textual information
+    iTXt: international textual information
+    bKGD: suggested background color
+    pHYs: physical dimensions
+    tIME: modification time
+
+1.2. features not supported
+---------------------------
+
+The following features are _not_ supported:
+
+*) some features needed to make a conformant PNG-Editor might be still missing.
+*) partial loading/stream processing. All data must be available and is processed in one call.
+*) The following public chunks are not supported but treated as unknown chunks by LodePNG
+    cHRM, gAMA, iCCP, sRGB, sBIT, hIST, sPLT
+   Some of these are not supported on purpose: LodePNG wants to provide the RGB values
+   stored in the pixels, not values modified by system dependent gamma or color models.
+
+
+2. C and C++ version
+--------------------
+
+The C version uses buffers allocated with alloc that you need to free()
+yourself. You need to use init and cleanup functions for each struct whenever
+using a struct from the C version to avoid exploits and memory leaks.
+
+The C++ version has extra functions with std::vectors in the interface and the
+lodepng::State class which is a LodePNGState with constructor and destructor.
+
+These files work without modification for both C and C++ compilers because all
+the additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers
+ignore it, and the C code is made to compile both with strict ISO C90 and C++.
+
+To use the C++ version, you need to rename the source file to lodepng.cpp
+(instead of lodepng.c), and compile it with a C++ compiler.
+
+To use the C version, you need to rename the source file to lodepng.c (instead
+of lodepng.cpp), and compile it with a C compiler.
+
+
+3. Security
+-----------
+
+Even if carefully designed, it's always possible that LodePNG contains possible
+exploits. If you discover one, please let me know, and it will be fixed.
+
+When using LodePNG, care has to be taken with the C version of LodePNG, as well
+as the C-style structs when working with C++. The following conventions are used
+for all C-style structs:
+
+-if a struct has a corresponding init function, always call the init function when making a new one
+-if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks
+-if a struct has a corresponding copy function, use the copy function instead of "=".
+ The destination must also be inited already.
+
+
+4. Decoding
+-----------
+
+Decoding converts a PNG compressed image to a raw pixel buffer.
+
+Most documentation on using the decoder is at its declarations in the header
+above. For C, simple decoding can be done with functions such as
+lodepng_decode32, and more advanced decoding can be done with the struct
+LodePNGState and lodepng_decode. For C++, all decoding can be done with the
+various lodepng::decode functions, and lodepng::State can be used for advanced
+features.
+
+When using the LodePNGState, it uses the following fields for decoding:
+*) LodePNGInfo info_png: it stores extra information about the PNG (the input) in here
+*) LodePNGColorMode info_raw: here you can say what color mode of the raw image (the output) you want to get
+*) LodePNGDecoderSettings decoder: you can specify a few extra settings for the decoder to use
+
+LodePNGInfo info_png
+--------------------
+
+After decoding, this contains extra information of the PNG image, except the actual
+pixels, width and height because these are already gotten directly from the decoder
+functions.
+
+It contains for example the original color type of the PNG image, text comments,
+suggested background color, etc... More details about the LodePNGInfo struct are
+at its declaration documentation.
+
+LodePNGColorMode info_raw
+-------------------------
+
+When decoding, here you can specify which color type you want
+the resulting raw image to be. If this is different from the colortype of the
+PNG, then the decoder will automatically convert the result. This conversion
+always works, except if you want it to convert a color PNG to greyscale or to
+a palette with missing colors.
+
+By default, 32-bit color is used for the result.
+
+LodePNGDecoderSettings decoder
+------------------------------
+
+The settings can be used to ignore the errors created by invalid CRC and Adler32
+chunks, and to disable the decoding of tEXt chunks.
+
+There's also a setting color_convert, true by default. If false, no conversion
+is done, the resulting data will be as it was in the PNG (after decompression)
+and you'll have to puzzle the colors of the pixels together yourself using the
+color type information in the LodePNGInfo.
+
+
+5. Encoding
+-----------
+
+Encoding converts a raw pixel buffer to a PNG compressed image.
+
+Most documentation on using the encoder is at its declarations in the header
+above. For C, simple encoding can be done with functions such as
+lodepng_encode32, and more advanced decoding can be done with the struct
+LodePNGState and lodepng_encode. For C++, all encoding can be done with the
+various lodepng::encode functions, and lodepng::State can be used for advanced
+features.
+
+Like the decoder, the encoder can also give errors. However it gives less errors
+since the encoder input is trusted, the decoder input (a PNG image that could
+be forged by anyone) is not trusted.
+
+When using the LodePNGState, it uses the following fields for encoding:
+*) LodePNGInfo info_png: here you specify how you want the PNG (the output) to be.
+*) LodePNGColorMode info_raw: here you say what color type of the raw image (the input) has
+*) LodePNGEncoderSettings encoder: you can specify a few settings for the encoder to use
+
+LodePNGInfo info_png
+--------------------
+
+When encoding, you use this the opposite way as when decoding: for encoding,
+you fill in the values you want the PNG to have before encoding. By default it's
+not needed to specify a color type for the PNG since it's automatically chosen,
+but it's possible to choose it yourself given the right settings.
+
+The encoder will not always exactly match the LodePNGInfo struct you give,
+it tries as close as possible. Some things are ignored by the encoder. The
+encoder uses, for example, the following settings from it when applicable:
+colortype and bitdepth, text chunks, time chunk, the color key, the palette, the
+background color, the interlace method, unknown chunks, ...
+
+When encoding to a PNG with colortype 3, the encoder will generate a PLTE chunk.
+If the palette contains any colors for which the alpha channel is not 255 (so
+there are translucent colors in the palette), it'll add a tRNS chunk.
+
+LodePNGColorMode info_raw
+-------------------------
+
+You specify the color type of the raw image that you give to the input here,
+including a possible transparent color key and palette you happen to be using in
+your raw image data.
+
+By default, 32-bit color is assumed, meaning your input has to be in RGBA
+format with 4 bytes (unsigned chars) per pixel.
+
+LodePNGEncoderSettings encoder
+------------------------------
+
+The following settings are supported (some are in sub-structs):
+*) auto_convert: when this option is enabled, the encoder will
+automatically choose the smallest possible color mode (including color key) that
+can encode the colors of all pixels without information loss.
+*) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree,
+   2 = dynamic huffman tree (best compression). Should be 2 for proper
+   compression.
+*) use_lz77: whether or not to use LZ77 for compressed block types. Should be
+   true for proper compression.
+*) windowsize: the window size used by the LZ77 encoder (1 - 32768). Has value
+   2048 by default, but can be set to 32768 for better, but slow, compression.
+*) force_palette: if colortype is 2 or 6, you can make the encoder write a PLTE
+   chunk if force_palette is true. This can used as suggested palette to convert
+   to by viewers that don't support more than 256 colors (if those still exist)
+*) add_id: add text chunk "Encoder: LodePNG <version>" to the image.
+*) text_compression: default 1. If 1, it'll store texts as zTXt instead of tEXt chunks.
+  zTXt chunks use zlib compression on the text. This gives a smaller result on
+  large texts but a larger result on small texts (such as a single program name).
+  It's all tEXt or all zTXt though, there's no separate setting per text yet.
+
+
+6. color conversions
+--------------------
+
+An important thing to note about LodePNG, is that the color type of the PNG, and
+the color type of the raw image, are completely independent. By default, when
+you decode a PNG, you get the result as a raw image in the color type you want,
+no matter whether the PNG was encoded with a palette, greyscale or RGBA color.
+And if you encode an image, by default LodePNG will automatically choose the PNG
+color type that gives good compression based on the values of colors and amount
+of colors in the image. It can be configured to let you control it instead as
+well, though.
+
+To be able to do this, LodePNG does conversions from one color mode to another.
+It can convert from almost any color type to any other color type, except the
+following conversions: RGB to greyscale is not supported, and converting to a
+palette when the palette doesn't have a required color is not supported. This is
+not supported on purpose: this is information loss which requires a color
+reduction algorithm that is beyong the scope of a PNG encoder (yes, RGB to grey
+is easy, but there are multiple ways if you want to give some channels more
+weight).
+
+By default, when decoding, you get the raw image in 32-bit RGBA or 24-bit RGB
+color, no matter what color type the PNG has. And by default when encoding,
+LodePNG automatically picks the best color model for the output PNG, and expects
+the input image to be 32-bit RGBA or 24-bit RGB. So, unless you want to control
+the color format of the images yourself, you can skip this chapter.
+
+6.1. PNG color types
+--------------------
+
+A PNG image can have many color types, ranging from 1-bit color to 64-bit color,
+as well as palettized color modes. After the zlib decompression and unfiltering
+in the PNG image is done, the raw pixel data will have that color type and thus
+a certain amount of bits per pixel. If you want the output raw image after
+decoding to have another color type, a conversion is done by LodePNG.
+
+The PNG specification gives the following color types:
+
+0: greyscale, bit depths 1, 2, 4, 8, 16
+2: RGB, bit depths 8 and 16
+3: palette, bit depths 1, 2, 4 and 8
+4: greyscale with alpha, bit depths 8 and 16
+6: RGBA, bit depths 8 and 16
+
+Bit depth is the amount of bits per pixel per color channel. So the total amount
+of bits per pixel is: amount of channels * bitdepth.
+
+6.2. color conversions
+----------------------
+
+As explained in the sections about the encoder and decoder, you can specify
+color types and bit depths in info_png and info_raw to change the default
+behaviour.
+
+If, when decoding, you want the raw image to be something else than the default,
+you need to set the color type and bit depth you want in the LodePNGColorMode,
+or the parameters of the simple function of LodePNG you're using.
+
+If, when encoding, you use another color type than the default in the input
+image, you need to specify its color type and bit depth in the LodePNGColorMode
+of the raw image, or use the parameters of the simplefunction of LodePNG you're
+using.
+
+If, when encoding, you don't want LodePNG to choose the output PNG color type
+but control it yourself, you need to set auto_convert in the encoder settings
+to LAC_NONE, and specify the color type you want in the LodePNGInfo of the
+encoder.
+
+If you do any of the above, LodePNG may need to do a color conversion, which
+follows the rules below, and may sometimes not be allowed.
+
+To avoid some confusion:
+-the decoder converts from PNG to raw image
+-the encoder converts from raw image to PNG
+-the colortype and bitdepth in LodePNGColorMode info_raw, are those of the raw image
+-the colortype and bitdepth in the color field of LodePNGInfo info_png, are those of the PNG
+-when encoding, the color type in LodePNGInfo is ignored if auto_convert
+ is enabled, it is automatically generated instead
+-when decoding, the color type in LodePNGInfo is set by the decoder to that of the original
+ PNG image, but it can be ignored since the raw image has the color type you requested instead
+-if the color type of the LodePNGColorMode and PNG image aren't the same, a conversion
+ between the color types is done if the color types are supported. If it is not
+ supported, an error is returned. If the types are the same, no conversion is done.
+-even though some conversions aren't supported, LodePNG supports loading PNGs from any
+ colortype and saving PNGs to any colortype, sometimes it just requires preparing
+ the raw image correctly before encoding.
+-both encoder and decoder use the same color converter.
+
+Non supported color conversions:
+-color to greyscale: no error is thrown, but the result will look ugly because
+only the red channel is taken
+-anything, to palette when that palette does not have that color in it: in this
+case an error is thrown
+
+Supported color conversions:
+-anything to 8-bit RGB, 8-bit RGBA, 16-bit RGB, 16-bit RGBA
+-any grey or grey+alpha, to grey or grey+alpha
+-anything to a palette, as long as the palette has the requested colors in it
+-removing alpha channel
+-higher to smaller bitdepth, and vice versa
+
+If you want no color conversion to be done:
+-In the encoder, you can make it save a PNG with any color type by giving the
+raw color mode and LodePNGInfo the same color mode, and setting auto_convert to
+LAC_NO.
+-In the decoder, you can make it store the pixel data in the same color type
+as the PNG has, by setting the color_convert setting to false. Settings in
+info_raw are then ignored.
+
+The function lodepng_convert does the color conversion. It is available in the
+interface but normally isn't needed since the encoder and decoder already call
+it.
+
+6.3. padding bits
+-----------------
+
+In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines
+have a bit amount that isn't a multiple of 8, then padding bits are used so that each
+scanline starts at a fresh byte. But that is NOT true for the LodePNG raw input and output.
+The raw input image you give to the encoder, and the raw output image you get from the decoder
+will NOT have these padding bits, e.g. in the case of a 1-bit image with a width
+of 7 pixels, the first pixel of the second scanline will the the 8th bit of the first byte,
+not the first bit of a new byte.
+
+
+7. error values
+---------------
+
+All functions in LodePNG that return an error code, return 0 if everything went
+OK, or a non-zero code if there was an error.
+
+The meaning of the LodePNG error values can be retrieved with the function
+lodepng_error_text: given the numerical error code, it returns a description
+of the error in English as a string.
+
+Check the implementation of lodepng_error_text to see the meaning of each code.
+
+
+8. chunks and PNG editing
+-------------------------
+
+If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG
+editor that should follow the rules about handling of unknown chunks, or if your
+program is able to read other types of chunks than the ones handled by LodePNG,
+then that's possible with the chunk functions of LodePNG.
+
+A PNG chunk has the following layout:
+
+4 bytes length
+4 bytes type name
+length bytes data
+4 bytes CRC
+
+8.1. iterating through chunks
+-----------------------------
+
+If you have a buffer containing the PNG image data, then the first chunk (the
+IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the
+signature of the PNG and are not part of a chunk. But if you start at byte 8
+then you have a chunk, and can check the following things of it.
+
+NOTE: none of these functions check for memory buffer boundaries. To avoid
+exploits, always make sure the buffer contains all the data of the chunks.
+When using lodepng_chunk_next, make sure the returned value is within the
+allocated memory.
+
+unsigned lodepng_chunk_length(const unsigned char* chunk):
+
+Get the length of the chunk's data. The total chunk length is this length + 12.
+
+void lodepng_chunk_type(char type[5], const unsigned char* chunk):
+unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type):
+
+Get the type of the chunk or compare if it's a certain type
+
+unsigned char lodepng_chunk_critical(const unsigned char* chunk):
+unsigned char lodepng_chunk_private(const unsigned char* chunk):
+unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk):
+
+Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are).
+Check if the chunk is private (public chunks are part of the standard, private ones not).
+Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical
+chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your
+program doesn't handle that type of unknown chunk.
+
+unsigned char* lodepng_chunk_data(unsigned char* chunk):
+const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk):
+
+Get a pointer to the start of the data of the chunk.
+
+unsigned lodepng_chunk_check_crc(const unsigned char* chunk):
+void lodepng_chunk_generate_crc(unsigned char* chunk):
+
+Check if the crc is correct or generate a correct one.
+
+unsigned char* lodepng_chunk_next(unsigned char* chunk):
+const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk):
+
+Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these
+functions do no boundary checking of the allocated data whatsoever, so make sure there is enough
+data available in the buffer to be able to go to the next chunk.
+
+unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk):
+unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length,
+                              const char* type, const unsigned char* data):
+
+These functions are used to create new chunks that are appended to the data in *out that has
+length *outlength. The append function appends an existing chunk to the new data. The create
+function creates a new chunk with the given parameters and appends it. Type is the 4-letter
+name of the chunk.
+
+8.2. chunks in info_png
+-----------------------
+
+The LodePNGInfo struct contains fields with the unknown chunk in it. It has 3
+buffers (each with size) to contain 3 types of unknown chunks:
+the ones that come before the PLTE chunk, the ones that come between the PLTE
+and the IDAT chunks, and the ones that come after the IDAT chunks.
+It's necessary to make the distionction between these 3 cases because the PNG
+standard forces to keep the ordering of unknown chunks compared to the critical
+chunks, but does not force any other ordering rules.
+
+info_png.unknown_chunks_data[0] is the chunks before PLTE
+info_png.unknown_chunks_data[1] is the chunks after PLTE, before IDAT
+info_png.unknown_chunks_data[2] is the chunks after IDAT
+
+The chunks in these 3 buffers can be iterated through and read by using the same
+way described in the previous subchapter.
+
+When using the decoder to decode a PNG, you can make it store all unknown chunks
+if you set the option settings.remember_unknown_chunks to 1. By default, this
+option is off (0).
+
+The encoder will always encode unknown chunks that are stored in the info_png.
+If you need it to add a particular chunk that isn't known by LodePNG, you can
+use lodepng_chunk_append or lodepng_chunk_create to the chunk data in
+info_png.unknown_chunks_data[x].
+
+Chunks that are known by LodePNG should not be added in that way. E.g. to make
+LodePNG add a bKGD chunk, set background_defined to true and add the correct
+parameters there instead.
+
+
+9. compiler support
+-------------------
+
+No libraries other than the current standard C library are needed to compile
+LodePNG. For the C++ version, only the standard C++ library is needed on top.
+Add the files lodepng.c(pp) and lodepng.h to your project, include
+lodepng.h where needed, and your program can read/write PNG files.
+
+If performance is important, use optimization when compiling! For both the
+encoder and decoder, this makes a large difference.
+
+Make sure that LodePNG is compiled with the same compiler of the same version
+and with the same settings as the rest of the program, or the interfaces with
+std::vectors and std::strings in C++ can be incompatible.
+
+CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets.
+
+*) gcc and g++
+
+LodePNG is developed in gcc so this compiler is natively supported. It gives no
+warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++
+version 4.7.0 on Linux.
+
+*) Mingw
+
+The Mingw compiler (a port of gcc) for Windows is fully supported by LodePNG.
+
+*) Visual Studio 2005 and Visual C++ 2005 Express Edition
+
+Versions 20070604 up to 20080107 have been tested on VS2005 and work. Visual
+studio may give warnings about 'fopen' being deprecated. A multiplatform library
+can't support the proposed Visual Studio alternative however.
+
+If you're using LodePNG in VS2005 and don't want to see the deprecated warnings,
+put this on top of lodepng.h before the inclusions:
+#define _CRT_SECURE_NO_DEPRECATE
+
+Visual Studio may want "stdafx.h" files to be included in each source file. That
+is not standard C++ and will not be added to the stock LodePNG. Try to find a
+setting to disable it for this source file.
+
+*) Visual Studio 6.0
+
+LodePNG support for Visual Studio 6.0 is not guaranteed because VS6 doesn't
+follow the C++ standard correctly.
+
+*) Comeau C/C++
+
+Vesion 20070107 compiles without problems on the Comeau C/C++ Online Test Drive
+at http://www.comeaucomputing.com/tryitout in both C90 and C++ mode.
+
+*) Compilers on Macintosh
+
+LodePNG has been reported to work both with the gcc and LLVM for Macintosh, both
+for C and C++.
+
+*) Other Compilers
+
+If you encounter problems on other compilers, feel free to let me know and I may
+try to fix it if the compiler is modern standards complient.
+
+
+10. examples
+------------
+
+This decoder example shows the most basic usage of LodePNG. More complex
+examples can be found on the LodePNG website.
+
+10.1. decoder C++ example
+-------------------------
+
+#include "lodepng.h"
+#include <iostream>
+
+int main(int argc, char *argv[])
+{
+  const char* filename = argc > 1 ? argv[1] : "test.png";
+
+  //load and decode
+  std::vector<unsigned char> image;
+  unsigned width, height;
+  unsigned error = lodepng::decode(image, width, height, filename);
+
+  //if there's an error, display it
+  if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl;
+
+  //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...
+}
+
+10.2. decoder C example
+-----------------------
+
+#include "lodepng.h"
+
+int main(int argc, char *argv[])
+{
+  unsigned error;
+  unsigned char* image;
+  size_t width, height;
+  const char* filename = argc > 1 ? argv[1] : "test.png";
+
+  error = lodepng_decode32_file(&image, &width, &height, filename);
+
+  if(error) printf("decoder error %u: %s\n", error, lodepng_error_text(error));
+
+  / * use image here * /
+
+  free(image);
+  return 0;
+}
+
+
+11. changes
+-----------
+
+The version number of LodePNG is the date of the change given in the format
+yyyymmdd.
+
+Some changes aren't backwards compatible. Those are indicated with a (!)
+symbol.
+
+*) 23 jun 2012: Added more filter strategies. Made it easier to use custom alloc
+    and free functions and toggle #defines from compiler flags. Small fixes.
+*) 6 may 2012 (!): Made plugging in custom zlib/deflate functions more flexible.
+*) 22 apr 2012 (!): Made interface more consistent, renaming a lot. Removed
+    redundant C++ codec classes. Reduced amount of structs. Everything changed,
+    but it is cleaner now imho and functionality remains the same. Also fixed
+    several bugs and shrinked the implementation code. Made new samples.
+*) 6 nov 2011 (!): By default, the encoder now automatically chooses the best
+    PNG color model and bit depth, based on the amount and type of colors of the
+    raw image. For this, autoLeaveOutAlphaChannel replaced by auto_choose_color.
+*) 9 okt 2011: simpler hash chain implementation for the encoder.
+*) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching.
+*) 23 aug 2011: tweaked the zlib compression parameters after benchmarking.
+    A bug with the PNG filtertype heuristic was fixed, so that it chooses much
+    better ones (it's quite significant). A setting to do an experimental, slow,
+    brute force search for PNG filter types is added.
+*) 17 aug 2011 (!): changed some C zlib related function names.
+*) 16 aug 2011: made the code less wide (max 120 characters per line).
+*) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors.
+*) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled.
+*) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman
+    to optimize long sequences of zeros.
+*) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and
+    LodePNG_InfoColor_canHaveAlpha functions for convenience.
+*) 7 nov 2010: added LodePNG_error_text function to get error code description.
+*) 30 okt 2010: made decoding slightly faster
+*) 26 okt 2010: (!) changed some C function and struct names (more consistent).
+     Reorganized the documentation and the declaration order in the header.
+*) 08 aug 2010: only changed some comments and external samples.
+*) 05 jul 2010: fixed bug thanks to warnings in the new gcc version.
+*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers.
+*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could
+    read by ignoring the problem but windows apps couldn't.
+*) 06 jun 2008: added more error checks for out of memory cases.
+*) 26 apr 2008: added a few more checks here and there to ensure more safety.
+*) 06 mar 2008: crash with encoding of strings fixed
+*) 02 feb 2008: support for international text chunks added (iTXt)
+*) 23 jan 2008: small cleanups, and #defines to divide code in sections
+*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor.
+*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder.
+*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added
+    Also vareous fixes, such as in the deflate and the padding bits code.
+*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved
+    filtering code of encoder.
+*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A
+    C++ wrapper around this provides an interface almost identical to before.
+    Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code
+    are together in these files but it works both for C and C++ compilers.
+*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks
+*) 30 aug 2007: bug fixed which makes this Borland C++ compatible
+*) 09 aug 2007: some VS2005 warnings removed again
+*) 21 jul 2007: deflate code placed in new namespace separate from zlib code
+*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images
+*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing
+    invalid std::vector element [0] fixed, and level 3 and 4 warnings removed
+*) 02 jun 2007: made the encoder add a tag with version by default
+*) 27 may 2007: zlib and png code separated (but still in the same file),
+    simple encoder/decoder functions added for more simple usage cases
+*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69),
+    moved some examples from here to lodepng_examples.cpp
+*) 12 may 2007: palette decoding bug fixed
+*) 24 apr 2007: changed the license from BSD to the zlib license
+*) 11 mar 2007: very simple addition: ability to encode bKGD chunks.
+*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding
+    palettized PNG images. Plus little interface change with palette and texts.
+*) 03 mar 2007: Made it encode dynamic Huffman shorter  with repeat codes.
+    Fixed a bug where the end code of a block had length 0 in the Huffman tree.
+*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented
+    and supported by the encoder, resulting in smaller PNGs at the output.
+*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone.
+*) 24 jan 2007: gave encoder an error interface. Added color conversion from any
+    greyscale type to 8-bit greyscale with or without alpha.
+*) 21 jan 2007: (!) Totally changed the interface. It allows more color types
+    to convert to and is more uniform. See the manual for how it works now.
+*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days:
+    encode/decode custom tEXt chunks, separate classes for zlib & deflate, and
+    at last made the decoder give errors for incorrect Adler32 or Crc.
+*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel.
+*) 29 dec 2006: Added support for encoding images without alpha channel, and
+    cleaned out code as well as making certain parts faster.
+*) 28 dec 2006: Added "Settings" to the encoder.
+*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now.
+    Removed some code duplication in the decoder. Fixed little bug in an example.
+*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter.
+    Fixed a bug of the decoder with 16-bit per color.
+*) 15 okt 2006: Changed documentation structure
+*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the
+    given image buffer, however for now it's not compressed.
+*) 08 sep 2006: (!) Changed to interface with a Decoder class
+*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different
+    way. Renamed decodePNG to decodePNGGeneric.
+*) 29 jul 2006: (!) Changed the interface: image info is now returned as a
+    struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy.
+*) 28 jul 2006: Cleaned the code and added new error checks.
+    Corrected terminology "deflate" into "inflate".
+*) 23 jun 2006: Added SDL example in the documentation in the header, this
+    example allows easy debugging by displaying the PNG and its transparency.
+*) 22 jun 2006: (!) Changed way to obtain error value. Added
+    loadFile function for convenience. Made decodePNG32 faster.
+*) 21 jun 2006: (!) Changed type of info vector to unsigned.
+    Changed position of palette in info vector. Fixed an important bug that
+    happened on PNGs with an uncompressed block.
+*) 16 jun 2006: Internally changed unsigned into unsigned where
+    needed, and performed some optimizations.
+*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them
+    in LodePNG namespace. Changed the order of the parameters. Rewrote the
+    documentation in the header. Renamed files to lodepng.cpp and lodepng.h
+*) 22 apr 2006: Optimized and improved some code
+*) 07 sep 2005: (!) Changed to std::vector interface
+*) 12 aug 2005: Initial release (C++, decoder only)
+
+
+12. contact information
+-----------------------
+
+Feel free to contact me with suggestions, problems, comments, ... concerning
+LodePNG. If you encounter a PNG image that doesn't work properly with this
+decoder, feel free to send it and I'll use it to find and fix the problem.
+
+My email address is (puzzle the account and domain together with an @ symbol):
+Domain: gmail dot com.
+Account: lode dot vandevenne.
+
+
+Copyright (c) 2005-2012 Lode Vandevenne
+*/
diff --git a/lib/png.c b/lib/png.c
new file mode 100644
index 0000000..f71fc6a
--- /dev/null
+++ b/lib/png.c
@@ -0,0 +1,89 @@
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <fb.h>
+#include <asm/byteorder.h>
+#include <init.h>
+#include <image_renderer.h>
+#include <graphic_utils.h>
+#include <linux/zlib.h>
+
+#include "png.h"
+
+z_stream png_stream;
+static int initialized;
+
+int png_uncompress_init(void)
+{
+	if (!initialized++) {
+		png_stream.workspace = malloc(zlib_inflate_workspacesize());
+		if (!png_stream.workspace) {
+			initialized = 0;
+			return -ENOMEM;
+		}
+		png_stream.next_in = NULL;
+		png_stream.avail_in = 0;
+		zlib_inflateInit(&png_stream);
+	}
+	return 0;
+}
+
+void png_uncompress_exit(void)
+{
+	if (!--initialized) {
+		zlib_inflateEnd(&png_stream);
+		vfree(png_stream.workspace);
+	}
+}
+
+static int png_renderer(struct fb_info *info, struct image *img, void* fb,
+		int startx, int starty, void* offscreenbuf)
+{
+	int width, height;
+	void *buf;
+	int xres, yres;
+
+	xres = info->xres;
+	yres = info->yres;
+
+	if (startx < 0) {
+		startx = (xres - img->width) / 2;
+		if (startx < 0)
+			startx = 0;
+	}
+
+	if (starty < 0) {
+		starty = (yres - img->height) / 2;
+		if (starty < 0)
+			starty = 0;
+	}
+
+	width = min(img->width, xres - startx);
+	height = min(img->height, yres - starty);
+
+	buf = offscreenbuf ? offscreenbuf : fb;
+
+	rgba_blend(info, img->data, buf, height, width, startx, starty, true);
+
+	if (offscreenbuf) {
+		int fbsize;
+
+		fbsize = xres * yres * (info->bits_per_pixel >> 3);
+		memcpy(fb, offscreenbuf, fbsize);
+	}
+
+	return img->height;
+}
+
+static struct image_renderer png = {
+	.type = filetype_png,
+	.open = png_open,
+	.close = png_close,
+	.renderer = png_renderer,
+};
+
+static int png_init(void)
+{
+	return image_renderer_register(&png);
+}
+fs_initcall(png_init);
diff --git a/lib/png.h b/lib/png.h
new file mode 100644
index 0000000..3ac9364
--- /dev/null
+++ b/lib/png.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * GPL v2
+ */
+
+#ifndef __PNG_H__
+#define __PNG_H__
+
+#include <filetype.h>
+#include <linux/list.h>
+#include <errno.h>
+#include <linux/err.h>
+
+int png_uncompress_init(void);
+void png_uncompress_exit(void);
+void png_close(struct image *img);
+struct image *png_open(char *inbuf, int insize);
+extern z_stream png_stream;
+
+#endif /* __PNG_H__ */
diff --git a/lib/png_lode.c b/lib/png_lode.c
new file mode 100644
index 0000000..5c46370
--- /dev/null
+++ b/lib/png_lode.c
@@ -0,0 +1,90 @@
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <fb.h>
+#include <asm/byteorder.h>
+#include <init.h>
+#include <image_renderer.h>
+#include <graphic_utils.h>
+#include <linux/zlib.h>
+
+#include "lodepng.h"
+#include "png.h"
+
+unsigned lodepng_custom_zlib_decompress(unsigned char** out, size_t* outsize,
+					const unsigned char* in, size_t insize,
+					const LodePNGDecompressSettings* settings)
+{
+	int err;
+
+	png_stream.next_in = in;
+	png_stream.avail_in = insize;
+
+	png_stream.next_out = *out;
+	png_stream.avail_out = *outsize;
+
+	err = zlib_inflateReset(&png_stream);
+	if (err != Z_OK) {
+		printk("zlib_inflateReset error %d\n", err);
+		zlib_inflateEnd(&png_stream);
+		zlib_inflateInit(&png_stream);
+	}
+
+	err = zlib_inflate(&png_stream, Z_FINISH);
+	if (err != Z_STREAM_END)
+		goto err;
+	return 0;
+
+err:
+	printk("Error %d while decompressing!\n", err);
+	printk("%p(%d)->%p(%d)\n", in, insize, *out, *outsize);
+	return -EIO;
+}
+
+struct image *png_open(char *inbuf, int insize)
+{
+	LodePNGState state;
+	int ret;
+	unsigned error;
+	struct image *img = calloc(1, sizeof(struct image));
+	unsigned char *png;
+
+	if (!img)
+		return ERR_PTR(-ENOMEM);
+
+	ret = png_uncompress_init();
+	if (ret)
+		goto err;
+
+	lodepng_state_init(&state);
+
+	state.info_raw.colortype = LCT_RGBA;
+	state.info_raw.bitdepth = 8;
+
+	error = lodepng_decode(&png, &img->width, &img->height, &state, inbuf, insize);
+
+	if(error) {
+		printf("error %u: %s\n", error, lodepng_error_text(error));
+		ret = -EINVAL;
+		goto err;
+	}
+
+	img->bits_per_pixel = 4 << 3;
+	img->data = png;
+
+	pr_debug("png: %d x %d data@0x%p\n", img->width, img->height, img->data);
+
+	lodepng_state_cleanup(&state);
+
+	return img;
+err:
+	free(png);
+	free(img);
+	return ERR_PTR(ret);
+}
+
+void png_close(struct image *img)
+{
+	free(img->data);
+	png_uncompress_exit();
+}
-- 
1.7.10.4


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[PATCH 11/11] png: add picoPNG lib support

[Jean-Christophe PLAGNIOL-VILLARD]

This is an alternative to LodePNG take from http://forge.voodooprojects.org/
which is base on picoPNG C++ wrote by Lode Vandevenne. The same author as
LodePNG.

PicoPNG only support RGBA PNG8

The source code of picopng.c was just adapted to be compliant with C89 and drop
the internal ZLIB support. Coding style untouched.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 lib/Kconfig    |    5 +
 lib/Makefile   |    1 +
 lib/picopng.c  |  810 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/picopng.h  |   34 +++
 lib/png_pico.c |   85 ++++++
 5 files changed, 935 insertions(+)
 create mode 100644 lib/picopng.c
 create mode 100644 lib/picopng.h
 create mode 100644 lib/png_pico.c

diff --git a/lib/Kconfig b/lib/Kconfig
index 2405d59..1fc6704 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -62,6 +62,11 @@ config LODEPNG
 	help
 	  Mostly PNG support
 
+config PICOPNG
+	bool "picoPNG"
+	help
+	  Support only RGBA PNG8
+
 endchoice
 
 endif
diff --git a/lib/Makefile b/lib/Makefile
index d752343..0431954 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -39,3 +39,4 @@ obj-$(CONFIG_IMAGE_RENDERER)	+= image_renderer.o graphic_utils.o
 obj-$(CONFIG_IMAGE_RENDERER)	+= image_renderer.o
 obj-$(CONFIG_PNG)	+= png.o
 obj-$(CONFIG_LODEPNG)	+= png_lode.o lodepng.o
+obj-$(CONFIG_PICOPNG)	+= png_pico.o picopng.o
diff --git a/lib/picopng.c b/lib/picopng.c
new file mode 100644
index 0000000..77cd81c
--- /dev/null
+++ b/lib/picopng.c
@@ -0,0 +1,810 @@
+// picoPNG version 20080503 (cleaned up and ported to c by kaitek)
+// Copyright (c) 2005-2008 Lode Vandevenne
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+//   1. The origin of this software must not be misrepresented; you must not
+//      claim that you wrote the original software. If you use this software
+//      in a product, an acknowledgment in the product documentation would be
+//      appreciated but is not required.
+//   2. Altered source versions must be plainly marked as such, and must not be
+//      misrepresented as being the original software.
+//   3. This notice may not be removed or altered from any source distribution.
+
+#include <common.h>
+#include <malloc.h>
+#include "picopng.h"
+
+/*************************************************************************************************/
+
+typedef struct png_alloc_node {
+	struct png_alloc_node *prev, *next;
+	void *addr;
+	size_t size;
+} png_alloc_node_t;
+
+png_alloc_node_t *png_alloc_head = NULL;
+png_alloc_node_t *png_alloc_tail = NULL;
+
+png_alloc_node_t *png_alloc_find_node(void *addr)
+{
+	png_alloc_node_t *node;
+	for (node = png_alloc_head; node; node = node->next)
+		if (node->addr == addr)
+			break;
+	return node;
+}
+
+void png_alloc_add_node(void *addr, size_t size)
+{
+	png_alloc_node_t *node;
+	if (png_alloc_find_node(addr))
+		return;
+	node = malloc(sizeof (png_alloc_node_t));
+	node->addr = addr;
+	node->size = size;
+	node->prev = png_alloc_tail;
+	node->next = NULL;
+	png_alloc_tail = node;
+	if (node->prev)
+		node->prev->next = node;
+	if (!png_alloc_head)
+		png_alloc_head = node;
+}
+
+void png_alloc_remove_node(png_alloc_node_t *node)
+{
+	if (node->prev)
+		node->prev->next = node->next;
+	if (node->next)
+		node->next->prev = node->prev;
+	if (node == png_alloc_head)
+		png_alloc_head = node->next;
+	if (node == png_alloc_tail)
+		png_alloc_tail = node->prev;
+	node->prev = node->next = node->addr = NULL;
+	free(node);
+}
+
+void *png_alloc_malloc(size_t size)
+{
+	void *addr = malloc(size);
+	png_alloc_add_node(addr, size);
+	return addr;
+}
+
+void *png_alloc_realloc(void *addr, size_t size)
+{
+	void *new_addr;
+	if (!addr)
+		return png_alloc_malloc(size);
+	new_addr = realloc(addr, size);
+	if (new_addr != addr) {
+		png_alloc_node_t *old_node;
+		old_node = png_alloc_find_node(addr);
+		png_alloc_remove_node(old_node);
+		png_alloc_add_node(new_addr, size);
+	}
+	return new_addr;
+}
+
+void png_alloc_free(void *addr)
+{
+	png_alloc_node_t *node = png_alloc_find_node(addr);
+	if (!node)
+		return;
+	png_alloc_remove_node(node);
+	free(addr);
+}
+
+void png_alloc_free_all()
+{
+	while (png_alloc_tail) {
+		void *addr = png_alloc_tail->addr;
+		png_alloc_remove_node(png_alloc_tail);
+		free(addr);
+	}
+}
+
+/*************************************************************************************************/
+
+__maybe_unused void vector32_cleanup(vector32_t *p)
+{
+	p->size = p->allocsize = 0;
+	if (p->data)
+		png_alloc_free(p->data);
+	p->data = NULL;
+}
+
+uint32_t vector32_resize(vector32_t *p, size_t size)
+{	// returns 1 if success, 0 if failure ==> nothing done
+	if (size * sizeof (uint32_t) > p->allocsize) {
+		size_t newsize = size * sizeof (uint32_t) * 2;
+		void *data = png_alloc_realloc(p->data, newsize);
+		if (data) {
+			p->allocsize = newsize;
+			p->data = (uint32_t *) data;
+			p->size = size;
+		} else
+			return 0;
+	} else
+		p->size = size;
+	return 1;
+}
+
+uint32_t vector32_resizev(vector32_t *p, size_t size, uint32_t value)
+{	// resize and give all new elements the value
+	size_t oldsize = p->size, i;
+	if (!vector32_resize(p, size))
+		return 0;
+	for (i = oldsize; i < size; i++)
+		p->data[i] = value;
+	return 1;
+}
+
+void vector32_init(vector32_t *p)
+{
+	p->data = NULL;
+	p->size = p->allocsize = 0;
+}
+
+vector32_t *vector32_new(size_t size, uint32_t value)
+{
+	vector32_t *p = png_alloc_malloc(sizeof (vector32_t));
+	vector32_init(p);
+	if (size && !vector32_resizev(p, size, value))
+		return NULL;
+	return p;
+}
+
+/*************************************************************************************************/
+
+__maybe_unused void vector8_cleanup(vector8_t *p)
+{
+	p->size = p->allocsize = 0;
+	if (p->data)
+		png_alloc_free(p->data);
+	p->data = NULL;
+}
+
+uint32_t vector8_resize(vector8_t *p, size_t size)
+{	// returns 1 if success, 0 if failure ==> nothing done
+	// xxx: the use of sizeof uint32_t here seems like a bug (this descends from the lodepng vector
+	// compatibility functions which do the same). without this there is corruption in certain cases,
+	// so this was probably done to cover up allocation bug(s) in the original picopng code!
+	if (size * sizeof (uint32_t) > p->allocsize) {
+		size_t newsize = size * sizeof (uint32_t) * 2;
+		void *data = png_alloc_realloc(p->data, newsize);
+		if (data) {
+			p->allocsize = newsize;
+			p->data = (uint8_t *) data;
+			p->size = size;
+		} else
+			return 0; // error: not enough memory
+	} else
+		p->size = size;
+	return 1;
+}
+
+uint32_t vector8_resizev(vector8_t *p, size_t size, uint8_t value)
+{	// resize and give all new elements the value
+	size_t oldsize = p->size, i;
+	if (!vector8_resize(p, size))
+		return 0;
+	for (i = oldsize; i < size; i++)
+		p->data[i] = value;
+	return 1;
+}
+
+void vector8_init(vector8_t *p)
+{
+	p->data = NULL;
+	p->size = p->allocsize = 0;
+}
+
+vector8_t *vector8_new(size_t size, uint8_t value)
+{
+	vector8_t *p = png_alloc_malloc(sizeof (vector8_t));
+	vector8_init(p);
+	if (size && !vector8_resizev(p, size, value))
+		return NULL;
+	return p;
+}
+
+vector8_t *vector8_copy(vector8_t *p)
+{
+	vector8_t *q = vector8_new(p->size, 0);
+	uint32_t n;
+	for (n = 0; n < q->size; n++)
+		q->data[n] = p->data[n];
+	return q;
+}
+
+/*************************************************************************************************/
+int Zlib_decompress(vector8_t *out, const vector8_t *in) // returns error value
+{
+	return picopng_zlib_decompress(out->data, out->size, in->data, in->size);
+}
+
+/*************************************************************************************************/
+
+#define PNG_SIGNATURE	0x0a1a0a0d474e5089ull
+
+#define CHUNK_IHDR		0x52444849
+#define CHUNK_IDAT		0x54414449
+#define CHUNK_IEND		0x444e4549
+#define CHUNK_PLTE		0x45544c50
+#define CHUNK_tRNS		0x534e5274
+
+int PNG_error;
+
+uint32_t PNG_readBitFromReversedStream(size_t *bitp, const uint8_t *bits)
+{
+	uint32_t result = (bits[*bitp >> 3] >> (7 - (*bitp & 0x7))) & 1;
+	(*bitp)++;
+	return result;
+}
+
+uint32_t PNG_readBitsFromReversedStream(size_t *bitp, const uint8_t *bits, uint32_t nbits)
+{
+	uint32_t i, result = 0;
+	for (i = nbits - 1; i < nbits; i--)
+		result += ((PNG_readBitFromReversedStream(bitp, bits)) << i);
+	return result;
+}
+
+void PNG_setBitOfReversedStream(size_t *bitp, uint8_t *bits, uint32_t bit)
+{
+	bits[*bitp >> 3] |= (bit << (7 - (*bitp & 0x7)));
+	(*bitp)++;
+}
+
+uint32_t PNG_read32bitInt(const uint8_t *buffer)
+{
+	return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3];
+}
+
+int PNG_checkColorValidity(uint32_t colorType, uint32_t bd) // return type is a LodePNG error code
+{
+	if ((colorType == 2 || colorType == 4 || colorType == 6)) {
+		if (!(bd == 8 || bd == 16))
+			return 37;
+		else
+			return 0;
+	} else if (colorType == 0) {
+		if (!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16))
+			return 37;
+		else
+			return 0;
+	} else if (colorType == 3) {
+		if (!(bd == 1 || bd == 2 || bd == 4 || bd == 8))
+			return 37;
+		else
+			return 0;
+	} else
+		return 31; // nonexistent color type
+}
+
+uint32_t PNG_getBpp(const PNG_info_t *info)
+{
+	uint32_t bitDepth, colorType;
+	bitDepth = info->bitDepth;
+	colorType = info->colorType;
+	if (colorType == 2)
+		return (3 * bitDepth);
+	else if (colorType >= 4)
+		return (colorType - 2) * bitDepth;
+	else
+		return bitDepth;
+}
+
+void PNG_readPngHeader(PNG_info_t *info, const uint8_t *in, size_t inlength)
+{	// read the information from the header and store it in the Info
+	if (inlength < 29) {
+		PNG_error = 27; // error: the data length is smaller than the length of the header
+		return;
+	}
+	if (*(uint64_t *) in != PNG_SIGNATURE) {
+		PNG_error = 28; // no PNG signature
+		return;
+	}
+	if (*(uint32_t *) &in[12] != CHUNK_IHDR) {
+		PNG_error = 29; // error: it doesn't start with a IHDR chunk!
+		return;
+	}
+	info->width = PNG_read32bitInt(&in[16]);
+	info->height = PNG_read32bitInt(&in[20]);
+	info->bitDepth = in[24];
+	info->colorType = in[25];
+	info->compressionMethod = in[26];
+	if (in[26] != 0) {
+		PNG_error = 32; // error: only compression method 0 is allowed in the specification
+		return;
+	}
+	info->filterMethod = in[27];
+	if (in[27] != 0) {
+		PNG_error = 33; // error: only filter method 0 is allowed in the specification
+		return;
+	}
+	info->interlaceMethod = in[28];
+	if (in[28] > 1) {
+		PNG_error = 34; // error: only interlace methods 0 and 1 exist in the specification
+		return;
+	}
+	PNG_error = PNG_checkColorValidity(info->colorType, info->bitDepth);
+}
+
+int PNG_paethPredictor(int a, int b, int c) // Paeth predicter, used by PNG filter type 4
+{
+	int p, pa, pb, pc;
+	p = a + b - c;
+	pa = p > a ? (p - a) : (a - p);
+	pb = p > b ? (p - b) : (b - p);
+	pc = p > c ? (p - c) : (c - p);
+	return (pa <= pb && pa <= pc) ? a : (pb <= pc ? b : c);
+}
+
+void PNG_unFilterScanline(uint8_t *recon, const uint8_t *scanline, const uint8_t *precon,
+		size_t bytewidth, uint32_t filterType, size_t length)
+{
+	size_t i;
+	switch (filterType) {
+	case 0:
+		for (i = 0; i < length; i++)
+			recon[i] = scanline[i];
+		break;
+	case 1:
+		for (i = 0; i < bytewidth; i++)
+			recon[i] = scanline[i];
+		for (i = bytewidth; i < length; i++)
+			recon[i] = scanline[i] + recon[i - bytewidth];
+		break;
+	case 2:
+		if (precon)
+			for (i = 0; i < length; i++)
+				recon[i] = scanline[i] + precon[i];
+		else
+			for (i = 0; i < length; i++)
+				recon[i] = scanline[i];
+		break;
+	case 3:
+		if (precon) {
+			for (i = 0; i < bytewidth; i++)
+				recon[i] = scanline[i] + precon[i] / 2;
+			for (i = bytewidth; i < length; i++)
+				recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) / 2);
+		} else {
+			for (i = 0; i < bytewidth; i++)
+				recon[i] = scanline[i];
+			for (i = bytewidth; i < length; i++)
+				recon[i] = scanline[i] + recon[i - bytewidth] / 2;
+		}
+		break;
+	case 4:
+		if (precon) {
+			for (i = 0; i < bytewidth; i++)
+				recon[i] = (uint8_t) (scanline[i] + PNG_paethPredictor(0, precon[i], 0));
+			for (i = bytewidth; i < length; i++)
+				recon[i] = (uint8_t) (scanline[i] + PNG_paethPredictor(recon[i - bytewidth],
+						precon[i], precon[i - bytewidth]));
+		} else {
+			for (i = 0; i < bytewidth; i++)
+				recon[i] = scanline[i];
+			for (i = bytewidth; i < length; i++)
+				recon[i] = (uint8_t) (scanline[i] + PNG_paethPredictor(recon[i - bytewidth], 0, 0));
+		}
+		break;
+	default:
+		PNG_error = 36; // error: nonexistent filter type given
+		return;
+	}
+}
+
+void PNG_adam7Pass(uint8_t *out, uint8_t *linen, uint8_t *lineo, const uint8_t *in, uint32_t w,
+		size_t passleft, size_t passtop, size_t spacex, size_t spacey, size_t passw, size_t passh,
+		uint32_t bpp)
+{
+	size_t bytewidth, linelength;
+	uint32_t y;
+	uint8_t *temp;
+	// filter and reposition the pixels into the output when the image is Adam7 interlaced. This
+	// function can only do it after the full image is already decoded. The out buffer must have
+	// the correct allocated memory size already.
+	if (passw == 0)
+		return;
+	bytewidth = (bpp + 7) / 8;
+	linelength = 1 + ((bpp * passw + 7) / 8);
+	for (y = 0; y < passh; y++) {
+		size_t i, b;
+		uint8_t filterType = in[y * linelength], *prevline = (y == 0) ? 0 : lineo;
+		PNG_unFilterScanline(linen, &in[y * linelength + 1], prevline, bytewidth, filterType,
+				(w * bpp + 7) / 8);
+		if (PNG_error)
+			return;
+		if (bpp >= 8)
+			for (i = 0; i < passw; i++)
+				for (b = 0; b < bytewidth; b++) // b = current byte of this pixel
+					out[bytewidth * w * (passtop + spacey * y) + bytewidth *
+							(passleft + spacex * i) + b] = linen[bytewidth * i + b];
+		else
+			for (i = 0; i < passw; i++) {
+				size_t obp, bp;
+				obp = bpp * w * (passtop + spacey * y) + bpp * (passleft + spacex * i);
+				bp = i * bpp;
+				for (b = 0; b < bpp; b++)
+					PNG_setBitOfReversedStream(&obp, out, PNG_readBitFromReversedStream(&bp, linen));
+			}
+		temp = linen;
+		linen = lineo;
+		lineo = temp; // swap the two buffer pointers "line old" and "line new"
+	}
+}
+
+int PNG_convert(const PNG_info_t *info, vector8_t *out, const uint8_t *in)
+{	// converts from any color type to 32-bit. return value = LodePNG error code
+	size_t i, c;
+	uint32_t bitDepth, colorType;
+	size_t numpixels, bp;
+	uint8_t *out_data;
+
+	bitDepth = info->bitDepth;
+	colorType = info->colorType;
+	numpixels = info->width * info->height;
+	bp = 0;
+	vector8_resize(out, numpixels * 4);
+	out_data = out->size ? out->data : 0;
+	if (bitDepth == 8 && colorType == 0) // greyscale
+		for (i = 0; i < numpixels; i++) {
+			out_data[4 * i + 0] = out_data[4 * i + 1] = out_data[4 * i + 2] = in[i];
+			out_data[4 * i + 3] = (info->key_defined && (in[i] == info->key_r)) ? 0 : 255;
+		}
+	else if (bitDepth == 8 && colorType == 2) // RGB color
+		for (i = 0; i < numpixels; i++) {
+			for (c = 0; c < 3; c++)
+				out_data[4 * i + c] = in[3 * i + c];
+			out_data[4 * i + 3] = (info->key_defined && (in[3 * i + 0] == info->key_r) &&
+					(in[3 * i + 1] == info->key_g) && (in[3 * i + 2] == info->key_b)) ? 0 : 255;
+		}
+	else if (bitDepth == 8 && colorType == 3) // indexed color (palette)
+		for (i = 0; i < numpixels; i++) {
+			if (4U * in[i] >= info->palette->size)
+				return 46;
+			for (c = 0; c < 4; c++) // get rgb colors from the palette
+				out_data[4 * i + c] = info->palette->data[4 * in[i] + c];
+		}
+	else if (bitDepth == 8 && colorType == 4) // greyscale with alpha
+		for (i = 0; i < numpixels; i++) {
+			out_data[4 * i + 0] = out_data[4 * i + 1] = out_data[4 * i + 2] = in[2 * i + 0];
+			out_data[4 * i + 3] = in[2 * i + 1];
+		}
+	else if (bitDepth == 8 && colorType == 6)
+		for (i = 0; i < numpixels; i++)
+			for (c = 0; c < 4; c++)
+				out_data[4 * i + c] = in[4 * i + c]; // RGB with alpha
+	else if (bitDepth == 16 && colorType == 0) // greyscale
+		for (i = 0; i < numpixels; i++) {
+			out_data[4 * i + 0] = out_data[4 * i + 1] = out_data[4 * i + 2] = in[2 * i];
+			out_data[4 * i + 3] = (info->key_defined && (256U * in[i] + in[i + 1] == info->key_r))
+					? 0 : 255;
+		}
+	else if (bitDepth == 16 && colorType == 2) // RGB color
+		for (i = 0; i < numpixels; i++) {
+			for (c = 0; c < 3; c++)
+				out_data[4 * i + c] = in[6 * i + 2 * c];
+			out_data[4 * i + 3] = (info->key_defined &&
+					(256U * in[6 * i + 0] + in[6 * i + 1] == info->key_r) &&
+					(256U * in[6 * i + 2] + in[6 * i + 3] == info->key_g) &&
+					(256U * in[6 * i + 4] + in[6 * i + 5] == info->key_b)) ? 0 : 255;
+		}
+	else if (bitDepth == 16 && colorType == 4) // greyscale with alpha
+		for (i = 0; i < numpixels; i++) {
+			out_data[4 * i + 0] = out_data[4 * i + 1] = out_data[4 * i + 2] = in[4 * i]; // msb
+			out_data[4 * i + 3] = in[4 * i + 2];
+		}
+	else if (bitDepth == 16 && colorType == 6)
+		for (i = 0; i < numpixels; i++)
+			for (c = 0; c < 4; c++)
+				out_data[4 * i + c] = in[8 * i + 2 * c]; // RGB with alpha
+	else if (bitDepth < 8 && colorType == 0) // greyscale
+		for (i = 0; i < numpixels; i++) {
+			uint32_t value = (PNG_readBitsFromReversedStream(&bp, in, bitDepth) * 255) /
+					((1 << bitDepth) - 1); // scale value from 0 to 255
+			out_data[4 * i + 0] = out_data[4 * i + 1] = out_data[4 * i + 2] = (uint8_t) value;
+			out_data[4 * i + 3] = (info->key_defined && value &&
+					(((1U << bitDepth) - 1U) == info->key_r) && ((1U << bitDepth) - 1U)) ? 0 : 255;
+		}
+	else if (bitDepth < 8 && colorType == 3) // palette
+		for (i = 0; i < numpixels; i++) {
+			uint32_t value = PNG_readBitsFromReversedStream(&bp, in, bitDepth);
+			if (4 * value >= info->palette->size)
+				return 47;
+			for (c = 0; c < 4; c++) // get rgb colors from the palette
+				out_data[4 * i + c] = info->palette->data[4 * value + c];
+		}
+	return 0;
+}
+
+PNG_info_t *PNG_info_new(void)
+{
+	PNG_info_t *info = png_alloc_malloc(sizeof (PNG_info_t));
+	uint32_t i;
+	for (i = 0; i < sizeof (PNG_info_t); i++)
+		((uint8_t *) info)[i] = 0;
+	info->palette = vector8_new(0, 0);
+	info->image = vector8_new(0, 0);
+	return info;
+}
+
+PNG_info_t *PNG_decode(const uint8_t *in, uint32_t size)
+{
+	PNG_info_t *info;
+	size_t pos;
+	vector8_t *idat;
+	bool IEND, known_type;
+	uint32_t bpp;
+	vector8_t *scanlines; // now the out buffer will be filled
+	size_t bytewidth, outlength;
+	uint8_t *out_data;
+
+	PNG_error = 0;
+
+	if (size == 0 || in == 0) {
+		PNG_error = 48; // the given data is empty
+		return NULL;
+	}
+	info = PNG_info_new();
+	PNG_readPngHeader(info, in, size);
+	if (PNG_error)
+		return NULL;
+	pos = 33; // first byte of the first chunk after the header
+	idat = NULL; // the data from idat chunks
+	IEND = false;
+	known_type = true;
+	info->key_defined = false;
+	// loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. IDAT data is
+	// put at the start of the in buffer
+	while (!IEND) {
+		size_t i, j;
+		size_t chunkLength;
+		uint32_t chunkType;
+
+		if (pos + 8 >= size) {
+			PNG_error = 30; // error: size of the in buffer too small to contain next chunk
+			return NULL;
+		}
+		chunkLength = PNG_read32bitInt(&in[pos]);
+		pos += 4;
+		if (chunkLength > 0x7fffffff) {
+			PNG_error = 63;
+			return NULL;
+		}
+		if (pos + chunkLength >= size) {
+			PNG_error = 35; // error: size of the in buffer too small to contain next chunk
+			return NULL;
+		}
+		chunkType = *(uint32_t *) &in[pos];
+		if (chunkType == CHUNK_IDAT) { // IDAT: compressed image data chunk
+			size_t offset = 0;
+			if (idat) {
+				offset = idat->size;
+				vector8_resize(idat, offset + chunkLength);
+			} else
+				idat = vector8_new(chunkLength, 0);
+			for (i = 0; i < chunkLength; i++)
+				idat->data[offset + i] = in[pos + 4 + i];
+			pos += (4 + chunkLength);
+		} else if (chunkType == CHUNK_IEND) { // IEND
+			pos += 4;
+			IEND = true;
+		} else if (chunkType == CHUNK_PLTE) { // PLTE: palette chunk
+			pos += 4; // go after the 4 letters
+			vector8_resize(info->palette, 4 * (chunkLength / 3));
+			if (info->palette->size > (4 * 256)) {
+				PNG_error = 38; // error: palette too big
+				return NULL;
+			}
+			for (i = 0; i < info->palette->size; i += 4) {
+				for (j = 0; j < 3; j++)
+					info->palette->data[i + j] = in[pos++]; // RGB
+				info->palette->data[i + 3] = 255; // alpha
+			}
+		} else if (chunkType == CHUNK_tRNS) { // tRNS: palette transparency chunk
+			pos += 4; // go after the 4 letters
+			if (info->colorType == 3) {
+				if (4 * chunkLength > info->palette->size) {
+					PNG_error = 39; // error: more alpha values given than there are palette entries
+					return NULL;
+				}
+				for (i = 0; i < chunkLength; i++)
+					info->palette->data[4 * i + 3] = in[pos++];
+			} else if (info->colorType == 0) {
+				if (chunkLength != 2) {
+					PNG_error = 40; // error: this chunk must be 2 bytes for greyscale image
+					return NULL;
+				}
+				info->key_defined = true;
+				info->key_r = info->key_g = info->key_b = 256 * in[pos] + in[pos + 1];
+				pos += 2;
+			} else if (info->colorType == 2) {
+				if (chunkLength != 6) {
+					PNG_error = 41; // error: this chunk must be 6 bytes for RGB image
+					return NULL;
+				}
+				info->key_defined = true;
+				info->key_r = 256 * in[pos] + in[pos + 1];
+				pos += 2;
+				info->key_g = 256 * in[pos] + in[pos + 1];
+				pos += 2;
+				info->key_b = 256 * in[pos] + in[pos + 1];
+				pos += 2;
+			} else {
+				PNG_error = 42; // error: tRNS chunk not allowed for other color models
+				return NULL;
+			}
+		} else { // it's not an implemented chunk type, so ignore it: skip over the data
+			if (!(in[pos + 0] & 32)) {
+				// error: unknown critical chunk (5th bit of first byte of chunk type is 0)
+				PNG_error = 69;
+				return NULL;
+			}
+			pos += (chunkLength + 4); // skip 4 letters and uninterpreted data of unimplemented chunk
+			known_type = false;
+		}
+		pos += 4; // step over CRC (which is ignored)
+	}
+	bpp = PNG_getBpp(info);
+	scanlines = vector8_new(((info->width * (info->height * bpp + 7)) / 8) + info->height, 0);
+	PNG_error = Zlib_decompress(scanlines, idat);
+	if (PNG_error)
+		return NULL; // stop if the zlib decompressor returned an error
+	bytewidth = (bpp + 7) / 8;
+	outlength = (info->height * info->width * bpp + 7) / 8;
+	vector8_resize(info->image, outlength); // time to fill the out buffer
+	out_data = outlength ? info->image->data : 0;
+	if (info->interlaceMethod == 0) { // no interlace, just filter
+		size_t y, obp, bp;
+		size_t linestart, linelength;
+		linestart = 0;
+		// length in bytes of a scanline, excluding the filtertype byte
+		linelength = (info->width * bpp + 7) / 8;
+		if (bpp >= 8) // byte per byte
+			for (y = 0; y < info->height; y++) {
+				uint32_t filterType = scanlines->data[linestart];
+				const uint8_t *prevline;
+				prevline = (y == 0) ? 0 : &out_data[(y - 1) * info->width * bytewidth];
+				PNG_unFilterScanline(&out_data[linestart - y], &scanlines->data[linestart + 1],
+						prevline, bytewidth, filterType, linelength);
+				if (PNG_error)
+					return NULL;
+				linestart += (1 + linelength); // go to start of next scanline
+		} else { // less than 8 bits per pixel, so fill it up bit per bit
+			vector8_t *templine; // only used if bpp < 8
+			templine = vector8_new((info->width * bpp + 7) >> 3, 0);
+			for (y = 0, obp = 0; y < info->height; y++) {
+				uint32_t filterType = scanlines->data[linestart];
+				const uint8_t *prevline;
+				prevline = (y == 0) ? 0 : &out_data[(y - 1) * info->width * bytewidth];
+				PNG_unFilterScanline(templine->data, &scanlines->data[linestart + 1], prevline,
+						bytewidth, filterType, linelength);
+				if (PNG_error)
+					return NULL;
+				for (bp = 0; bp < info->width * bpp;)
+					PNG_setBitOfReversedStream(&obp, out_data, PNG_readBitFromReversedStream(&bp,
+							templine->data));
+				linestart += (1 + linelength); // go to start of next scanline
+			}
+		}
+	} else { // interlaceMethod is 1 (Adam7)
+		int i;
+		vector8_t *scanlineo, *scanlinen; // "old" and "new" scanline
+		size_t passw[7] = {
+			(info->width + 7) / 8, (info->width + 3) / 8, (info->width + 3) / 4,
+			(info->width + 1) / 4, (info->width + 1) / 2, (info->width + 0) / 2,
+			(info->width + 0) / 1
+		};
+		size_t passh[7] = {
+			(info->height + 7) / 8, (info->height + 7) / 8, (info->height + 3) / 8,
+			(info->height + 3) / 4, (info->height + 1) / 4, (info->height + 1) / 2,
+			(info->height + 0) / 2
+		};
+		size_t passstart[7] = { 0 };
+		size_t pattern[28] = { 0, 4, 0, 2, 0, 1, 0, 0, 0, 4, 0, 2, 0, 1, 8, 8, 4, 4, 2, 2, 1, 8, 8,
+				8, 4, 4, 2, 2 }; // values for the adam7 passes
+		for (i = 0; i < 6; i++)
+			passstart[i + 1] = passstart[i] + passh[i] * ((passw[i] ? 1 : 0) + (passw[i] * bpp + 7) / 8);
+		scanlineo = vector8_new((info->width * bpp + 7) / 8, 0);
+		scanlinen = vector8_new((info->width * bpp + 7) / 8, 0);
+		for (i = 0; i < 7; i++)
+			PNG_adam7Pass(out_data, scanlinen->data, scanlineo->data, &scanlines->data[passstart[i]],
+					info->width, pattern[i], pattern[i + 7], pattern[i + 14], pattern[i + 21],
+					passw[i], passh[i], bpp);
+	}
+	if (info->colorType != 6 || info->bitDepth != 8) { // conversion needed
+		vector8_t *copy = vector8_copy(info->image); // xxx: is this copy necessary?
+		PNG_error = PNG_convert(info, info->image, copy->data);
+	}
+	return info;
+}
+
+/*************************************************************************************************/
+
+#ifdef TEST
+
+#include <stdio.h>
+#include <sys/stat.h>
+
+int main(int argc, char **argv)
+{
+	char *fname = (argc > 1) ? argv[1] : "test.png";
+	PNG_info_t *info;
+	struct stat statbuf;
+	uint32_t insize, outsize;
+	FILE *infp, *outfp;
+	uint8_t *inbuf;
+	uint32_t n;
+
+	if (stat(fname, &statbuf) != 0) {
+		perror("stat");
+		return 1;
+	} else if (!statbuf.st_size) {
+		printf("file empty\n");
+		return 1;
+	}
+	insize = (uint32_t) statbuf.st_size;
+	inbuf = malloc(insize);
+	infp = fopen(fname, "rb");
+	if (!infp) {
+		perror("fopen");
+		return 1;
+	} else if (fread(inbuf, 1, insize, infp) != insize) {
+		perror("fread");
+		return 1;
+	}
+	fclose(infp);
+
+	printf("input file: %s (size: %d)\n", fname, insize);
+
+	info = PNG_decode(inbuf, insize);
+	free(inbuf);
+	printf("PNG_error: %d\n", PNG_error);
+	if (PNG_error != 0)
+		return 1;
+
+	printf("width: %d, height: %d\nfirst 16 bytes: ", info->width, info->height);
+	for (n = 0; n < 16; n++)
+		printf("%02x ", info->image->data[n]);
+	printf("\n");
+
+	outsize = info->width * info->height * 4;
+	printf("image size: %d\n", outsize);
+	if (outsize != info->image->size) {
+		printf("error: image size doesn't match dimensions\n");
+		return 1;
+	}
+	outfp = fopen("out.bin", "wb");
+	if (!outfp) {
+		perror("fopen");
+		return 1;
+	} else if (fwrite(info->image->data, 1, outsize, outfp) != outsize) {
+		perror("fwrite");
+		return 1;
+	}
+	fclose(outfp);
+
+#ifdef ALLOC_DEBUG
+	png_alloc_node_t *node;
+	for (node = png_alloc_head, n = 1; node; node = node->next, n++)
+		printf("node %d (%p) addr = %p, size = %ld\n", n, node, node->addr, node->size);
+#endif
+	png_alloc_free_all(); // also frees info and image data from PNG_decode
+
+	return 0;
+}
+
+#endif
diff --git a/lib/picopng.h b/lib/picopng.h
new file mode 100644
index 0000000..14c5e28
--- /dev/null
+++ b/lib/picopng.h
@@ -0,0 +1,34 @@
+#ifndef _PICOPNG_H
+#define _PICOPNG_H
+
+typedef struct {
+	uint32_t *data;
+	size_t size;
+	size_t allocsize;
+} vector32_t;
+
+typedef struct {
+	uint8_t *data;
+	size_t size;
+	size_t allocsize;
+} vector8_t;
+
+typedef struct {
+	uint32_t width, height;
+	uint32_t colorType, bitDepth;
+	uint32_t compressionMethod, filterMethod, interlaceMethod;
+	uint32_t key_r, key_g, key_b;
+	bool key_defined; // is a transparent color key given?
+	vector8_t *palette;
+	vector8_t *image;
+} PNG_info_t;
+
+PNG_info_t *PNG_decode(const uint8_t *in, uint32_t size);
+void png_alloc_free_all(void);
+
+unsigned picopng_zlib_decompress(unsigned char* out, size_t outsize,
+				 const unsigned char* in, size_t insize);
+
+extern int PNG_error;
+
+#endif
diff --git a/lib/png_pico.c b/lib/png_pico.c
new file mode 100644
index 0000000..4f507c9
--- /dev/null
+++ b/lib/png_pico.c
@@ -0,0 +1,85 @@
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <fb.h>
+#include <asm/byteorder.h>
+#include <init.h>
+#include <image_renderer.h>
+#include <graphic_utils.h>
+#include <linux/zlib.h>
+
+#include "picopng.h"
+#include "png.h"
+
+unsigned picopng_zlib_decompress(unsigned char* out, size_t outsize,
+				 const unsigned char* in, size_t insize)
+{
+	int err;
+
+	png_stream.next_in = in;
+	png_stream.avail_in = insize;
+
+	png_stream.next_out = out;
+	png_stream.avail_out = outsize;
+
+	err = zlib_inflateReset(&png_stream);
+	if (err != Z_OK) {
+		printk("zlib_inflateReset error %d\n", err);
+		zlib_inflateEnd(&png_stream);
+		zlib_inflateInit(&png_stream);
+	}
+
+	err = zlib_inflate(&png_stream, Z_FINISH);
+	if (err != Z_STREAM_END)
+		goto err;
+	return 0;
+
+err:
+	printk("Error %d while decompressing!\n", err);
+	printk("%p(%d)->%p(%d)\n", in, insize, out, outsize);
+	return -EIO;
+}
+
+struct image *png_open(char *inbuf, int insize)
+{
+	PNG_info_t *png_info;
+	int ret;
+	struct image *img = calloc(1, sizeof(struct image));
+
+	if (!img)
+		return ERR_PTR(-ENOMEM);
+
+	ret = png_uncompress_init();
+	if (ret)
+		goto err;
+
+	/* rgba */
+	png_info = PNG_decode(inbuf, insize);
+
+	if(PNG_error) {
+		printf("error %u:\n", PNG_error);
+		ret = -EINVAL;
+		goto err;
+	}
+
+	img->width = png_info->width;
+	img->height = png_info->height;
+	img->bits_per_pixel = 4 << 3;
+	img->data = png_info->image->data;
+
+	pr_debug("png: %d x %d data@0x%p\n", img->width, img->height, img->data);
+
+	png_alloc_free_all();
+
+	return img;
+err:
+	png_alloc_free_all();
+	free(img);
+	return ERR_PTR(ret);
+}
+
+void png_close(struct image *img)
+{
+	free(img->data);
+	png_alloc_free_all();
+}
-- 
1.7.10.4


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Re: [PATCH 06/11] splash: add support to set a background color

[Sascha Hauer]

On Sat, Sep 08, 2012 at 08:05:37PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> This will allow to reset the screen to a default color when using transparent
> PNG.
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> ---
>  commands/splash.c |   79 +++++++++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 76 insertions(+), 3 deletions(-)
> 
> diff --git a/commands/splash.c b/commands/splash.c
> index 88a6cf1..4bddc6c 100644
> --- a/commands/splash.c
> +++ b/commands/splash.c
> @@ -9,6 +9,66 @@
>  #include <fb.h>
>  #include <image_renderer.h>
>  
> +static u32 get_pixel(struct fb_info *info, u32 color)
> +{
> +	u32 px;
> +	u8 t = (color >> 24) & 0xff;
> +	u8 r = (color >> 16) & 0xff;
> +	u8 g = (color >> 8 ) & 0xff;
> +	u8 b = (color >> 0 ) & 0xff;
> +
> +	if (info->grayscale) {
> +		 px = (r | g | b) ? 0xffffffff : 0x0;
> +		 return px;
> +	}
> +
> +	px = (t >> (8 - info->transp.length)) << info->transp.offset |
> +		 (r >> (8 - info->red.length)) << info->red.offset |
> +		 (g >> (8 - info->green.length)) << info->green.offset |
> +		 (b >> (8 - info->blue.length)) << info->blue.offset;
> +
> +	return px;
> +}
> +
> +static void memsetw(void *s, u16 c, size_t n)
> +{
> +	size_t i;
> +	u16* tmp = s;
> +
> +	for (i = 0; i < n; i++)
> +		*tmp++ = c;
> +}
> +
> +static void memsetl(void *s, u32 c, size_t n)
> +{
> +	size_t i;
> +	u32* tmp = s;
> +
> +	for (i = 0; i < n; i++)
> +		*tmp++ = c;
> +}
> +
> +static void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size)
> +{
> +	u32 px;
> +	u8 *screen = buf;
> +
> +	px = get_pixel(info, color);
> +
> +	switch (info->bits_per_pixel) {
> +	case 8:
> +		memset(screen, (uint8_t)px, size);
> +		break;
> +	case 16:
> +		memsetw(screen, (uint16_t)px, size);
> +		break;
> +	case 32:
> +	case 24:
> +		memsetl(screen, px, size);
> +		break;
> +	}
> +}
> +
>  static int do_splash(int argc, char *argv[])
>  {
>  	int ret, opt, fd;
> @@ -19,13 +79,19 @@ static int do_splash(int argc, char *argv[])
>  	int startx = -1, starty = -1;
>  	int xres, yres;
>  	int offscreen = 0;
> +	u32 bg_color = 0x00000000;
> +	bool do_bg = false;
>  	void *offscreenbuf = NULL;
>  
> -	while((opt = getopt(argc, argv, "f:x:y:o")) > 0) {
> +	while((opt = getopt(argc, argv, "f:x:y:ob:")) > 0) {
>  		switch(opt) {
>  		case 'f':
>  			fbdev = optarg;
>  			break;
> +		case 'b':
> +			bg_color = simple_strtoul(optarg, NULL, 0);
> +			do_bg = true;
> +			break;
>  		case 'x':
>  			startx = simple_strtoul(optarg, NULL, 0);
>  			break;
> @@ -71,8 +137,14 @@ static int do_splash(int argc, char *argv[])
>  
>  		fbsize = xres * yres * (info.bits_per_pixel >> 3);
>  		offscreenbuf = malloc(fbsize);
> -		if (offscreenbuf)
> -			memcpy(offscreenbuf, fb, fbsize);
> +		if (offscreenbuf) {
> +			if (do_bg)
> +				memset_pixel(&info, offscreenbuf, bg_color, xres * yres);
> +			else
> +				memcpy(offscreenbuf, fb, fbsize);
> +		}
> +	} else if (do_bg) {
> +		memset_pixel(&info, fb, bg_color, xres * yres);
>  	}
>  
>  	if (image_renderer_file(&info, image_file, fb, startx, starty,
> @@ -98,6 +170,7 @@ BAREBOX_CMD_HELP_SHORT("Show the bitmap FILE on the framebuffer.\n")
>  BAREBOX_CMD_HELP_OPT  ("-f <fb>",   "framebuffer device (/dev/fb0)\n")
>  BAREBOX_CMD_HELP_OPT  ("-x <xofs>", "x offset (default center)\n")
>  BAREBOX_CMD_HELP_OPT  ("-y <yofs>", "y offset (default center)\n")
> +BAREBOX_CMD_HELP_OPT  ("-b <backgroung>", "backgroung color\n")

s/backgroung/background/

Maybe better:

"-b <color>", "background color in 0xttrrggbb\n"

Sascha


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Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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Re: [PATCH 07/11] Introduce graphic utils

[Sascha Hauer]

On Sat, Sep 08, 2012 at 08:05:38PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> to Factorise pixel rendering
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> ---
>  commands/splash.c        |   61 +---------------------------------
>  include/graphic_utils.h  |   13 ++++++++
>  include/image_renderer.h |   20 -----------
>  lib/Makefile             |    1 +
>  lib/bmp.c                |    5 +--
>  lib/graphic_utils.c      |   83 ++++++++++++++++++++++++++++++++++++++++++++++
>  6 files changed, 101 insertions(+), 82 deletions(-)
>  create mode 100644 include/graphic_utils.h
>  create mode 100644 lib/graphic_utils.c
> 
> diff --git a/commands/splash.c b/commands/splash.c
> index 4bddc6c..f4b975b 100644
> --- a/commands/splash.c
> +++ b/commands/splash.c
> @@ -8,66 +8,7 @@
>  #include <fcntl.h>
>  #include <fb.h>
>  #include <image_renderer.h>
> -
> -static u32 get_pixel(struct fb_info *info, u32 color)
> -{
> -	u32 px;
> -	u8 t = (color >> 24) & 0xff;
> -	u8 r = (color >> 16) & 0xff;
> -	u8 g = (color >> 8 ) & 0xff;
> -	u8 b = (color >> 0 ) & 0xff;
> -
> -	if (info->grayscale) {
> -		 px = (r | g | b) ? 0xffffffff : 0x0;
> -		 return px;
> -	}
> -
> -	px = (t >> (8 - info->transp.length)) << info->transp.offset |
> -		 (r >> (8 - info->red.length)) << info->red.offset |
> -		 (g >> (8 - info->green.length)) << info->green.offset |
> -		 (b >> (8 - info->blue.length)) << info->blue.offset;
> -
> -	return px;
> -}
> -
> -static void memsetw(void *s, u16 c, size_t n)
> -{
> -	size_t i;
> -	u16* tmp = s;
> -
> -	for (i = 0; i < n; i++)
> -		*tmp++ = c;
> -}
> -
> -static void memsetl(void *s, u32 c, size_t n)
> -{
> -	size_t i;
> -	u32* tmp = s;
> -
> -	for (i = 0; i < n; i++)
> -		*tmp++ = c;
> -}
> -
> -static void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size)
> -{
> -	u32 px;
> -	u8 *screen = buf;
> -
> -	px = get_pixel(info, color);
> -
> -	switch (info->bits_per_pixel) {
> -	case 8:
> -		memset(screen, (uint8_t)px, size);
> -		break;
> -	case 16:
> -		memsetw(screen, (uint16_t)px, size);
> -		break;
> -	case 32:
> -	case 24:
> -		memsetl(screen, px, size);
> -		break;
> -	}
> -}

These were introduced with the last patch. The order should be reversed.

Sascha

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Re: [PATCH 10/11] add PNG support

[Sascha Hauer]

On Sat, Sep 08, 2012 at 08:05:41PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> use LodePNG version 20120729 from http://lodev.org/lodepng/
> 
> The original coding style is keeped to simplify update.
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> ---
> +	prompt "PNG Lib"
> +
> +config LODEPNG
> +	bool "lodePNG"
> +	help
> +	  Mostly PNG support

	  This PNG library supports most PNG formats.

Sascha

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Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
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Re: [PATCH 11/11] png: add picoPNG lib support

[Sascha Hauer]

On Sat, Sep 08, 2012 at 08:05:42PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> This is an alternative to LodePNG take from http://forge.voodooprojects.org/
> which is base on picoPNG C++ wrote by Lode Vandevenne. The same author as
> LodePNG.
> 
> PicoPNG only support RGBA PNG8
> 
> The source code of picopng.c was just adapted to be compliant with C89 and drop
> the internal ZLIB support. Coding style untouched.
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> ---
>  lib/Kconfig    |    5 +
>  lib/Makefile   |    1 +
>  lib/picopng.c  |  810 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  lib/picopng.h  |   34 +++
>  lib/png_pico.c |   85 ++++++
>  5 files changed, 935 insertions(+)
>  create mode 100644 lib/picopng.c
>  create mode 100644 lib/picopng.h
>  create mode 100644 lib/png_pico.c
> 
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 2405d59..1fc6704 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -62,6 +62,11 @@ config LODEPNG
>  	help
>  	  Mostly PNG support
>  
> +config PICOPNG
> +	bool "picoPNG"
> +	help
> +	  Support only RGBA PNG8

	  This PNG libraray only supports RGBA PNG8 but is much smaller
	  in binary size then lodepng.

Sascha

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Re: [PATCH 11/11] png: add picoPNG lib support

[Peter Korsgaard]

>>>>> "Sascha" == Sascha Hauer <s.hauer@pengutronix.de> writes:

 >> +config PICOPNG
 >> +	bool "picoPNG"
 >> +	help
 >> +	  Support only RGBA PNG8

 Sascha> 	  This PNG libraray only supports RGBA PNG8 but is much smaller
 Sascha> 	  in binary size then lodepng.

s/libraray/library/

s/then/than/

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Re: [PATCH 02/11] bmp: split bmp rending in lib/bmp.c

[Sascha Hauer]

In Subject: s/rending/rendering/

Or better: Move bmp rendering to lib/bmp.c

On Sat, Sep 08, 2012 at 08:05:33PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> @@ -34,3 +34,4 @@ obj-$(CONFIG_UNCOMPRESS)	+= uncompress.o
>  obj-$(CONFIG_BCH)	+= bch.o
>  obj-$(CONFIG_BITREV)	+= bitrev.o
>  obj-$(CONFIG_QSORT)	+= qsort.o
> +obj-$(CONFIG_BMP)	+= bmp.o
> diff --git a/lib/bmp.c b/lib/bmp.c
> new file mode 100644
> index 0000000..776d3b3
> --- /dev/null
> +++ b/lib/bmp.c
> @@ -0,0 +1,132 @@
> +#include <common.h>
> +#include <fs.h>
> +#include <errno.h>
> +#include <malloc.h>
> +#include <fb.h>
> +#include <bmp_layout.h>
> +#include <asm/byteorder.h>
> +
> +static inline void set_pixel(struct fb_info *info, void *adr, int r, int g, int b)

This function is first moved from commands/bmp.c to lib/bmp.c, then
added as a static inline to include/image_renderer.h, then removed again
from lib/bmp.c, then removed from include/image_renderer.h, then
reintroduced as a different function in include/graphic_utils.h.

Can you please reorder your patch series to make it readable so that we
can see what actually happens?

Thanks
 Sascha

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Re: [PATCH 11/11] png: add picoPNG lib support

[Sascha Hauer]

On Wed, Sep 12, 2012 at 09:48:08AM +0200, Peter Korsgaard wrote:
> >>>>> "Sascha" == Sascha Hauer <s.hauer@pengutronix.de> writes:
> 
>  >> +config PICOPNG
>  >> +	bool "picoPNG"
>  >> +	help
>  >> +	  Support only RGBA PNG8
> 
>  Sascha> 	  This PNG libraray only supports RGBA PNG8 but is much smaller
>  Sascha> 	  in binary size then lodepng.
> 
> s/libraray/library/
> 
> s/then/than/

even better ;)

Sascha

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