Re: [Qemu-devel] [PATCH] VMware SVGA uses incorrect depth

[andrzej zaborowski <balrogg@gmail.com>]

2009/2/27 Anthony Liguori <aliguori@us.ibm.com>:
> Brian Kress wrote:
>>
>> The VMware SVGA adapter is set to a 24 bit depth, where as the display
>> surfaces
>> (and just about everything else) are using a 32 bit depth.  So when you
>> use "-vga vmware"
>> in either the sdl or vnc displays, you get some very odd video that has
>> the wrong colors, is
>> repeated and is only over 3/4 of the screen.  Fix seems to be to change it
>> to 32 bit.  With
>> this patch I can use VMware video in both sdl and vnc and have it display
>> correctly.
>>
>>
>> Signed-off-by: Brian Kress <kressb@moose.net>
>>
>> Index: hw/vmware_vga.c
>> ===================================================================
>> --- hw/vmware_vga.c     (revision 6626)
>> +++ hw/vmware_vga.c     (working copy)
>> @@ -914,7 +914,7 @@
>>     s->width = -1;
>>     s->height = -1;
>>     s->svgaid = SVGA_ID;
>> -    s->depth = 24;
>> +    s->depth = 32;
>>     s->bypp = (s->depth + 7) >> 3;
>>
>
> I think having:
>
> s->depth = 24;
> s->bypp = 4;

I don't think hardcoding any depth is correct (not counting the
obvious performance disadvantage).  The s->depth value is what is
returned by the SVGA_REG_HOST_BITS_PER_PIXEL register, so it should be
the host's color depth if possible (may be impossible for VNC, but
easy with SDL), iirc this broke only recently.

Cheers