[cairo-bugs] [Bug 33711] Alpha Value Normalization from 255 to 128

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Feb 24 03:00:42 PST 2011


--- Comment #6 from Siarhei Siamashka <siarhei.siamashka at gmail.com> 2011-02-24 03:00:36 PST ---
(In reply to comment #5)
> 0-127 is my hardware's alpha ranges.

OK, thanks for the clarification. So contrary to your initial report 127 is
actually opaque. Then it's a simple case of adding x1a7r8g8b8 format to pixman
as suggested in bug 33741

The 0-128 range would have been a bit more tricky, but at least I could see
some more or less reasonable justification for somebody trying such format (for
example it might help to avoid divisions by 255 or 127 for alpha blending).

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