Did another test to confirm that the problem is in cairo. The attached
program will generate a /tmp/out.png with text in RGB, BGR, VRGB and
VBGR ordering, the vertical ordering will show up correctly, while the
horizontal ones are identical. Furthermore on option of the type:
cairo_font_options_set_antialias(fopts, CAIRO_ANTIALIAS_GRAY);
will still produce subpixel anti-aliasing, not grayscale, i.e. all the
same problems that can be seen in the Ubunte Font Rendering Details
dialog.
** Attachment added: "text.cpp"
https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/+bug/703191/+attachment/2324109/+files/text.cpp
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https://bugs.launchpad.net/bugs/703191
Title:
BGR-ordered subpixel font rendering appears broken/nonfunctional in
Gnome/GTK+
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