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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 13:11:08 -0400
User-agent: Mozilla Thunderbird 1.0.7 (X11/20051013)

By the way, I did verify that the patch works correctly in B/G/R 5/6/5 mode - I wasn't sure about 16-bit BGR before. However, in 16-bit mode, only -std-vga works correctly if the X server is in BGR mode. In 24-bit BGR mode, cirrus has no problem. I think there is some 16-bit trickery going on in the cirrus implementation, but I haven't had much time to figure it out. Also the cirrus implementation is really hard to follow for me, so if anyone has any idea, I'd appreciate it.


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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