[cairo-bugs] [Bug 5777] New: fbcompose.c broken for some composite operations post r1.5

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https://bugs.freedesktop.org/show_bug.cgi?id=5777          
     
           Summary: fbcompose.c broken for some composite operations post
                    r1.5
           Product: cairo
           Version: 1.1.1
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: major
          Priority: P2
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: tim.rowley at gmail.com
         QAContact: cairo-bugs at cairographics.org
                CC: davidr at novell.com


Revision 1.6 of fbcompose.c added an optimization to fbCompositeRect where the
src pixels would only be fetched once if this was possible (solid fills and the
like).    However this doesn't work for some operations which overwrite the src
buffer, for example fbCombineAddC (via fbCombineMaskValueC).  Such operations
need to be checked for when deciding when the src fetch-once optimization can occur.          
     
     
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