From 704af241ff75bb41795cb5588f154aaf77274db5 Mon Sep 17 00:00:00 2001
From: Andreas Monzner <andreas.monzner@multimedia-labs.de>
Date: Wed, 9 Jan 2008 22:36:15 +0000
Subject: [PATCH] remap lfb on resolution change

---
 lib/gdi/fb.cpp | 88 ++++++++++++++++++++++++++++----------------------
 1 file changed, 50 insertions(+), 38 deletions(-)

diff --git a/lib/gdi/fb.cpp b/lib/gdi/fb.cpp
index adf06a2c..e5bb46d0 100644
--- a/lib/gdi/fb.cpp
+++ b/lib/gdi/fb.cpp
@@ -27,10 +27,11 @@ fbClass *fbClass::getInstance()
 
 fbClass::fbClass(const char *fb)
 {
-	m_manual_blit=0;
+	lfb=0;
+	fb_fix_screeninfo fix;
+	m_manual_blit=-1;
 	instance=this;
 	locked=0;
-	available=0;
 	cmap.start=0;
 	cmap.len=256;
 	cmap.red=red;
@@ -40,43 +41,25 @@ fbClass::fbClass(const char *fb)
 
 	fd=open(fb, O_RDWR);
 	if (fd<0)
-	{
 		perror(fb);
-		goto nolfb;
-	}
-
-
-	if (ioctl(fd, FBIOGET_VSCREENINFO, &screeninfo)<0)
-	{
+	else if (ioctl(fd, FBIOGET_VSCREENINFO, &screeninfo)<0)
 		perror("FBIOGET_VSCREENINFO");
-		goto nolfb;
-	}
-	
-	memcpy(&oldscreen, &screeninfo, sizeof(screeninfo));
-
-	fb_fix_screeninfo fix;
-	if (ioctl(fd, FBIOGET_FSCREENINFO, &fix)<0)
-	{
+	else if (ioctl(fd, FBIOGET_FSCREENINFO, &fix)<0)
 		perror("FBIOGET_FSCREENINFO");
-		goto nolfb;
-	}
-
-	available=fix.smem_len;
-	eDebug("%dk video mem", available/1024);
-	lfb=(unsigned char*)mmap(0, available, PROT_WRITE|PROT_READ, MAP_SHARED, fd, 0);
-	if (!lfb)
+	else
 	{
-		perror("mmap");
-		goto nolfb;
+		memcpy(&oldscreen, &screeninfo, sizeof(screeninfo));
+		available=fix.smem_len;
+		lfb=(unsigned char*)mmap(0, available, PROT_WRITE|PROT_READ, MAP_SHARED, fd, 0);
+		if (!lfb)
+			perror("mmap");
+		else
+		{
+			showConsole(0);
+			enableManualBlit();
+			stride=fix.line_length;
+		}
 	}
-
-	showConsole(0);
-
-	enableManualBlit();
-	return;
-nolfb:
-	lfb=0;
-	printf("framebuffer not available.\n");
 	return;
 }
 
@@ -102,7 +85,12 @@ int fbClass::SetMode(unsigned int nxRes, unsigned int nyRes, unsigned int nbpp)
 	screeninfo.width=0;
 	screeninfo.xoffset=screeninfo.yoffset=0;
 	screeninfo.bits_per_pixel=nbpp;
-	
+
+	if (lfb) {
+		munmap(lfb, available);
+		lfb = 0;
+	}
+
 	if (ioctl(fd, FBIOPUT_VSCREENINFO, &screeninfo)<0)
 	{
 		// try single buffering
@@ -131,15 +119,31 @@ int fbClass::SetMode(unsigned int nxRes, unsigned int nyRes, unsigned int nbpp)
 	xRes=screeninfo.xres;
 	yRes=screeninfo.yres;
 	bpp=screeninfo.bits_per_pixel;
+
 	fb_fix_screeninfo fix;
 	if (ioctl(fd, FBIOGET_FSCREENINFO, &fix)<0)
 	{
 		perror("FBIOGET_FSCREENINFO");
 		printf("fb failed\n");
+		goto nolfb;
 	}
+
+	available=fix.smem_len;
+	eDebug("%dk video mem", available/1024);
+	lfb=(unsigned char*)mmap(0, available, PROT_WRITE|PROT_READ, MAP_SHARED, fd, 0);
+	if (!lfb)
+	{
+		perror("mmap");
+		goto nolfb;
+	}
+
 	stride=fix.line_length;
-	memset(lfb, 0, stride*yRes);
+
 	return 0;
+nolfb:
+	lfb=0;
+	eFatal("framebuffer no more ready after SetMode(%d, %d, %d)", nxRes, nyRes, nbpp);
+	return -1;
 }
 
 int fbClass::setOffset(int off)
@@ -157,7 +161,7 @@ int fbClass::waitVSync()
 
 void fbClass::blit()
 {
-	if (m_manual_blit) {
+	if (m_manual_blit == 1) {
 		if (ioctl(fd, FBIO_BLIT) < 0)
 			perror("FBIO_BLIT");
 	}
@@ -182,7 +186,13 @@ int fbClass::lock()
 {
 	if (locked)
 		return -1;
-	locked=1;
+	if (m_manual_blit == 1)
+	{
+		locked = 2;
+		disableManualBlit();
+	}
+	else
+		locked = 1;
 	return fd;
 }
 
@@ -190,6 +200,8 @@ void fbClass::unlock()
 {
 	if (!locked)
 		return;
+	if (locked == 2)  // re-enable manualBlit
+		enableManualBlit();
 	locked=0;
 	SetMode(xRes, yRes, bpp);
 	PutCMAP();
-- 
2.30.2