[cairo-bugs] [Bug 102661] Treat color glyph alpha as mask instead of source alpha

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102661

--- Comment #2 from Jan Alexander Steffens (heftig) <jan.steffens at gmail.com> ---
I think using alpha as the mask but leaving it in the source would do weird
things to the destination alpha, as it becomes src * src + dst * (1 - src),
i.e. you have a quadratic curve.

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