[cairo-bugs] [Bug 48221] Wayland gtk clients broken by 38a242a: spans, image, gl: Add fast-path for simple copies

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48221

bugzilla at dolphinling.net changed:

           What    |Removed                     |Added
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  Attachment #59861|0                           |1
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--- Comment #7 from bugzilla at dolphinling.net 2012-04-13 13:21:42 PDT ---
Created attachment 59939
  --> https://bugs.freedesktop.org/attachment.cgi?id=59939
patch?

The attached sign-swap in _cairo_gl_operand_translate fixes this bug for me.
I've checked gnome-calculator and gtk3-demo in wayland, and this fixes both of
them.

I don't understand the code well enough to know why this fixes it, or why it
was this way in the first place.

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