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Re: [Qemu-devel] Updated BGR vs. RGB vga patch...

From: Leonardo E. Reiter
Subject: Re: [Qemu-devel] Updated BGR vs. RGB vga patch...
Date: Tue, 11 Apr 2006 13:06:15 -0400
User-agent: Mozilla Thunderbird 1.0.7 (X11/20051013)

How's this:

Index: sdl.c
RCS file: /cvsroot/qemu/qemu/sdl.c,v
retrieving revision 1.25
diff -a -u -r1.25 sdl.c
--- sdl.c       9 Apr 2006 01:06:34 -0000       1.25
+++ sdl.c       11 Apr 2006 17:03:51 -0000
@@ -510,4 +510,9 @@
         gui_fullscreen_initial_grab = 1;
+ /* guess to use BGR mode by seeing if the blue color mask is greater than
+     * the red color mask, indicating that blue comes before red */
+    if (screen->format->Bmask > screen->format->Rmask)
+        bgr_display_enabled = 1;

combined with my prior bgr patch of course (bgr_display_enabled doesn't exist otherwise.) If you think it's right, let me know, or post a better one. Either way I can post an updated BGR patch with this hack. You can still manually use -bgr if you want, or perhaps the meaning of -bgr should be to enable this test. It may not be correct in all circumstances. Maybe Paul Brook can weigh in too since he originally suggested that this patch should determine this automatically.


Leo Reiter

malc wrote:
On Mon, 10 Apr 2006, Leonardo E. Reiter wrote:

Anyway, I didn't spend time figuring out how to query SDL for the ordering. You still have to manually pass in -bgr. The good news is that all the computation is now done at compile-time, with only very few tests done at run-time. I agree with your assessment of compile-time versus run-time options... I was merely suggesting a compromise to fend off the minor performance hit of using the old patch. But the method you suggested is much better and that's how it's implemented now.

I maybe going out on a limb here, but isn't rgb/bgr trivially deducible
from: sdl.c:screen->format->[RGBA]shift.

Leonardo E. Reiter
Vice President of Product Development, CTO

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