[cairo-bugs] [Bug 20913] Font rendering issues

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sat Mar 28 12:31:44 PDT 2009


James Cloos <cloos at jhcloos.com> changed:

           What    |Removed                     |Added
                 CC|                            |cloos at jhcloos.com

--- Comment #3 from James Cloos <cloos at jhcloos.com>  2009-03-28 12:31:42 PST ---
I looked at this before noticing that the bug report was for quartz....

That said, I can confirm that the lack of sub-pixel aa when using a pattern
does not occur when the test case is compiled with -DNOT_QUARTZ against a
version of cairo which uses freetype.  (I was going to write “it is
quartz-specific” but other backends (such as dows) may have similar

As for the gamma issue, zooming in on the image shows that the pixel coverage
is the same in the w/b half as in the b/w half.  A similar bug report was made
against libXft some years ago; the sub-pixel filtering has to take gamma into
consideration in order for the font weight to look similar when rendered to
different colour combinations.

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