From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Sun, 03 May 2026 10:45:29 +0200 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wJSSA-000U9y-05 for lore@lore.pengutronix.de; Sun, 03 May 2026 10:45:29 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1wJSS6-0004bI-J4 for lore@pengutronix.de; Sun, 03 May 2026 10:45:29 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=S0+tc2x4BIGsSpYEYg9JMJLF6+zGMQl74ryJissB0Xo=; b=Mx43czb0gCHK8e/oP8Y7o8Zqy9 LEi6X6i1alCFUMECU4jLrCCDxLkraE+EtL7v+5NoqQc7HYOylroVhvY325ZGlNtHmpzDYRRqkhy87 sik0alG/6CyqGJOR0urgqR//uGSWsBfUMkPUveC/Ka0IGMdlMopo02k26MqnCskokmr8h0MnHdwP8 y7+85eRDNddyLKzngtUCEnYzcWbXrflbHeodkzUC2vwckjjix7q0E0V3IUSQlooBgJB0gb5GEchYX HC56Uwp0RE3PIGsl2sC7MQqE9kdMXWLzhoG92l8wR8YjvJpva91DUdE6tlUg+T00/eNIqq63BPImB 6T0Fom9w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wJSRT-0000000Af7d-01Wr; Sun, 03 May 2026 08:44:47 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wJSRN-0000000AeuM-2Nfs for barebox@lists.infradead.org; Sun, 03 May 2026 08:44:43 +0000 Received: from ptz.office.stw.pengutronix.de ([2a0a:edc0:0:900:1d::77] helo=geraet.lan) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1wJSRL-0003oP-Sl; Sun, 03 May 2026 10:44:39 +0200 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Sun, 3 May 2026 10:33:20 +0200 Message-ID: <20260503084430.2765761-19-a.fatoum@barebox.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260503084430.2765761-1-a.fatoum@barebox.org> References: <20260503084430.2765761-1-a.fatoum@barebox.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260503_014441_656369_10EF7694 X-CRM114-Status: GOOD ( 12.35 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.0 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 18/20] fbconsole: implement alternate screen buffer (ESC[?1049h/l) X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) The alternate screen buffer is distinct from the scrollback-enabled primary buffer and meant for full screen applications. The ?1049 mode in particular is a superset of it that includes saving the cursor and clearing the buffer when entering. Implement it via taking a snapshot of the framebuffer's pixels. Link: https://terminalguide.namepad.de/mode/p1049/ Signed-off-by: Ahmad Fatoum --- drivers/video/fbconsole.c | 46 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/drivers/video/fbconsole.c b/drivers/video/fbconsole.c index bed55de7571e..3a2a680fc719 100644 --- a/drivers/video/fbconsole.c +++ b/drivers/video/fbconsole.c @@ -81,6 +81,10 @@ struct fbc_priv { struct fbc_screen_state cur; struct fbc_screen_state saved; /* DEC cursor save (\e7) */ + struct fbc_screen_state altscreen_saved; + void *altscreen_buf; /* pixel snapshot while in alternate screen */ + size_t altscreen_size; + unsigned int rotation; enum state_t state; @@ -651,6 +655,21 @@ static bool fbc_parse_csi(struct fbc_priv *priv) /* show cursor now */ toggle_cursor_visibility(priv); return true; + case 1049: /* alternate screen: save pixel buffer and state */ + if (!priv->altscreen_buf) { + void *src = gui_screen_render_buffer(priv->sc); + size_t sz = priv->fb->line_length * priv->fb->yres; + + priv->altscreen_buf = memdup(src, sz); + if (priv->altscreen_buf) { + priv->altscreen_size = sz; + priv->altscreen_saved = priv->cur; + } + priv->cur = (struct fbc_screen_state){}; + fbc_reset_colors(priv); + cls(priv); + } + return true; } break; case 'l': @@ -664,6 +683,27 @@ static bool fbc_parse_csi(struct fbc_priv *priv) /* hide cursor now */ priv->cur.flags |= HIDE_CURSOR; return true; + case 1049: /* alternate screen: restore pixel buffer and state */ + if (priv->altscreen_buf) { + void *dst = gui_screen_render_buffer(priv->sc); + size_t sz = priv->fb->line_length * priv->fb->yres; + + if (sz == priv->altscreen_size) { + memcpy(dst, priv->altscreen_buf, sz); + gu_screen_blit(priv->sc); + } else { + cls(priv); + } + free(priv->altscreen_buf); + priv->altscreen_buf = NULL; + priv->altscreen_size = 0; + priv->cur = priv->altscreen_saved; + } else { + priv->cur = (struct fbc_screen_state){}; + fbc_reset_colors(priv); + cls(priv); + } + return true; } break; case 'J': @@ -914,6 +954,12 @@ static int fbc_close(struct console_device *cdev) struct fbc_priv *priv = container_of(cdev, struct fbc_priv, cdev); + if (priv->altscreen_buf) { + free(priv->altscreen_buf); + priv->altscreen_buf = NULL; + priv->altscreen_size = 0; + } + if (priv->active) { fb_close(priv->sc); priv->active = false; -- 2.47.3