[cairo-bugs] [Bug 48221] New: Wayland gtk clients broken by 38a242a: spans, image, gl: Add fast-path for simple copies

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48221

             Bug #: 48221
           Summary: Wayland gtk clients broken by 38a242a: spans,image,gl:
                    Add fast-path for simple copies
    Classification: Unclassified
           Product: cairo
           Version: 1.12.0
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: gl backend
        AssignedTo: cairo-bugs at cairographics.org
        ReportedBy: bugzilla at dolphinling.net
         QAContact: cairo-bugs at cairographics.org


When using gtk-based programs on wayland, cairo commit 38a242a "spans,image,gl:
Add fast-path for simple copies" makes them corrupted. Specifically, I think,
any partly-repainted regions become transparent, and remain so until the window
is fully repainted.

gnome-calculator demonstrates the problem quite nicely.

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