[cairo] glitz surface fixes

[sunmoon1997]

Great work, but the rotate_source_surface_paint test I post a few days
before still fails here, could you show some light on this test?
在 2005-12-23五的 13:44 +0100，Vladimir Vukicevic写道：
> The attached patch fixes the cairo glitz surface; the culprit seemed
> to be that glitz (now?) applies the clip region when glitz_get_pixels
> is called; this is not what acquire_*_image expects, and so bad
> results happen in both writing a png out from a glitz surface, and any
> fallback paths that have to be taken that require pixman compositing.
> 
> There's also a patch to the image surface, which attempts to find a
> standard pixman format given a set of masks.  This is necessary so
> that the generic cairo_surface_write_to_png() will work with glitz
> surfaces; glitz surfaces use _cairo_image_surface_create_with_masks()
> to create an image surface, and the png code would bail because it
> didn't recognize the cairo_format_t.
> 
> All tests pass except for two -- there's a problem with unbounded
> operators and glyph rendering, and self-copy also fails.  (The
> unantialiased rendering tests also fail; I think the fix there is to
> just use a fallback path if non-AA rendering is desired.)  A number of
> tests pass but are marked as fails; there are a lot of different
> pixels (especially in rendered gradients), but the results are
> actually correct.  Not sure what to do about this in the test
> framework; there may be a need for per-backend reference images.
> 
> David, Carl, is it ok to commit this if it looks correct?
> 
>     - Vlad
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