[Bug 28670] some 2D apps way too slow, fast with noaccel (regression)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28670

--- Comment #4 from Alex Deucher <agd5f at yahoo.com> 2010-06-22 09:54:10 PDT ---
(In reply to comment #3)
> For MyPaint I can say what we are doing, we are telling cairo to render a
> rotated and/or zoomed pixmap. Oprofile shows that all time is being spent in
> libpixman, symbol bits_image_fetch_transformed.

libpixman means you are hitting a software fallback.  The hw doesn't support
RepeatNone with transformed xRGB source as it's behaviour not compliant with
the render spec.  As I said, you probably want RepeatPad rather than
RepeatNone.  See the comment at the end of R300CheckCompositeTexture():
http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/tree/src/radeon_exa_render.c

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