[cairo-bugs] [Bug 83933] New: push-group-color.xlib-fallback.rgb24 output is incomplete

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83933

          Priority: medium
            Bug ID: 83933
          Assignee: chris at chris-wilson.co.uk
           Summary: push-group-color.xlib-fallback.rgb24 output is
                    incomplete
        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 106374
  --> https://bugs.freedesktop.org/attachment.cgi?id=106374&action=edit
quick hack

It seems that the xlib surface drawable containing the group rendering
has not yet received the content from the shared memory when its content
is copied (XCopyArea) to the destination. The attached quick hack calls
_cairo_xlib_surface_put_shm and it fixes

pthread-same-text and pthread-similar .xlib-fallback.rgb24

BTW at src/cairo-xlib-core-compositor.c line 452 :
it says that when the destination is a Window the GC should be changed
to include ClipByChildren, but few lines below (line 498) ClipByChildren
is set when source does not owns a Pixmap, and it is set after XCopyArea
has been called.

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