[cairo-bugs] [Bug 47601] New: Alpha blending is broken on win32 surfaces

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47601

             Bug #: 47601
           Summary: Alpha blending is broken on win32 surfaces
    Classification: Unclassified
           Product: cairo
           Version: 1.10.3
          Platform: x86 (IA32)
        OS/Version: Windows (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: win32 backend
        AssignedTo: cairo-bugs at cairographics.org
        ReportedBy: kukkerman at gmail.com
         QAContact: cairo-bugs at cairographics.org


Created attachment 58775
  --> https://bugs.freedesktop.org/attachment.cgi?id=58775
Buggy alpha blending under win32 demo

Alpha blending on win32 surfaces is broken since commit
ae3319890eacd1c8282ca6df7b263ac74abb5f8d, only fully opaque pixels (alpha =
1.0) are actually apperaing in the window. See the attached source and play
with the global alpha variable.

The first affected version is 1.11.2 (according to git describe).

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