[cairo-bugs] [Bug 84286] New: clip-polygons.xcb-render-0_0.argb32 failure

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84286

          Priority: medium
            Bug ID: 84286
          Assignee: psychon at znc.in
           Summary: clip-polygons.xcb-render-0_0.argb32 failure
        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: xcb backend
           Product: cairo

Created attachment 106795
  --> https://bugs.freedesktop.org/attachment.cgi?id=106795&action=edit
quick hack

The problem is that the clip contains multiple self-intersecting paths,
in that case _cairo_clip_combine_with_surface (src/cairo-clip-surface.c:78)
uses each path separately with a fill (OPERATOR_IN), for each pixel on the
contour of more than one path that results in a different pixel coverage
than filling once with the path intersection of all paths.

In get_clip_surface (src/cairo-xcb-surface-render.c:1698) using a temoporary
clear image surface and painting in white (OPERATOR_ADD) to perform the
clip fixes

clip-polygons.xcb-render-0_0.argb32
clip-group-shapes-circles.xcb-render-0_0 .argb32 and .rgb24

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