[cairo-bugs] [Bug 81699] [need testcase] Segfault sweep_line_delete on video playback (2)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81699

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Segfault sweep_line_delete  |[need testcase] Segfault
                   |on video playback (2)       |sweep_line_delete on video
                   |                            |playback (2)

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 13a09526d2120c244471e03b6ae979016ef88e83
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat Aug 23 14:16:55 2014 +0100

    traps,xcb: Prefilter zero-area boxes when converting traps

    The rectangular tesselation routines rely on the presuming that all the
    boxes it has to handle are already filtered to remove empty boxes.

    << /width 800 /height 600 >> surface context
    0.0848671 0 0 0.0848671 39.907812 5.608896 matrix transform
    8 0 m 12.417969 0 16 3.582031 16 8 c 16 12.417969 12.417969 16 8 16 c
    3.582031 16 0 12.417969 0 8 c 0 3.582031 3.582031 0 8 0 c h
    clip
    16 0 m 8 8 l 16 16 l h
    clip
    0 0 16 16 rectangle
    fill

    Triggers the error given a traps tesselator like cairo-xlib.

    Reported-by: Henrique Lengler <henriqueleng at openmailbox.org>
    Analyzed-by: Massimo <sixtysix at inwind.it>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81699
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>


Fixed, but leaving open to add the testcase.

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