Re: [Qemu-devel] [PATCH 6/6] kvm: qemu: fix vga screendump

["andrzej zaborowski" <balrogg@gmail.com>]

2008/7/20 Anthony Liguori <anthony@codemonkey.ws>:
> andrzej zaborowski wrote:
>>
>> 2008/7/20 Anthony Liguori <anthony@codemonkey.ws>:
>>  With -no-graphic there's no ds->data, or it can have lower bpp than
>> what's otherwise available.
>>
>
> Screen dumping with -no-graphic probably should just show a black screen
> anyway.

I thought this was the main use case. You shouldn't need sdl installed
to perform the tests Avi talked about.

>
> I don't think a lower depth is really that big of a deal.  It's what the
> user would be seeing anyway.  The simplicity seems really nice to me.
>
>>> I think your patch looks better, but I can also code up a new screen
>>> dumping
>>> mechanism that doesn't take over DisplayState unless I'm missing
>>> something
>>> obvious.
>>>
>>
>> It's worth a try, dumping ds->data is perhaps the way to go but
>> ds->depth is being set to 32bit and various video cards are optimised
>> on the assumption that ds->depth doesn't change, so maybe there should
>> be a notification callback.
>>
>
> Yeah, that's a bug BTW and AFAIK it's only a problem with VMware VGA.

AFAIK also at least three other adapters.

>  There's nothing that keeps ds->depth from changing after a screen resize
> with SDL.  If a VNC client does SetPixelFormat that will also change
> ds->depth.  Right now, some VNC clients + VMware VGA will cause a SEGV
> because of the assumptions that ds->depth doesn't change.
>
> Regards,
>
> Anthony Liguori
>
>> Regards
>>
>>
>>
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