[cairo-bugs] [Bug 83896] New: xlib.fallback occasionally incorrectly treats OVER as SOURCE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83896

          Priority: medium
            Bug ID: 83896
          Assignee: chris at chris-wilson.co.uk
           Summary: xlib.fallback occasionally incorrectly treats OVER as
                    SOURCE
        QA Contact: cairo-bugs at cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: sixtysix at inwind.it
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: xlib backend
           Product: cairo

Created attachment 106329
  --> https://bugs.freedesktop.org/attachment.cgi?id=106329&action=edit
quick hack

the xlib.fallback composer calls a fill_reduces_to_source in
src/cairo.image-compositor.c that simplifies an OVER operator fill
to a SOURCE operator fill whenever the destination is clear.

This means that you have to mark the shm-image-surface as no longer clear
after it is filled as the attached quick hack does.

It fixes    

finer-grained-fallbacks      
over-above-source
over-around-source
over-between-source

all .xlib.fallback.rgb24

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