[cairo] Re: complex clip regions in cairo & glitz
davidr at novell.com
Tue Aug 16 20:07:06 PDT 2005
On Mon, 2005-08-15 at 16:42 -0700, Vladimir Vukicevic wrote:
> Things seem to grind to a halt whenever a complex
> (non-axis/pixel-aligned rectangular region) clip region set. In
> particular, glitz_composite with a dst surface using an A8 format
> seems to cause nvidia's EXT_framebuffer_object impl to always return
> UNSUPPORTED after the attachment is checked. Any ideas if this is
> something for nvidia to fix, or if it can be worked around?
Don't know if they'll ever support that, it would nice though.
In some cases the glitz backend could be using RGB or RGBA surfaces for
ALPHA surface but that would waste some memory of course.
The current software fall back path needs to be improved. I imagine that
something like this happens:
making it do the following instead would improve performance a lot:
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