[Poppler-bugs] [Bug 32791] Incorrect rendering of type 7 shading

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32791

--- Comment #1 from Andrea Canciani <ranma42 at gmail.com> 2011-01-24 01:51:05 PST ---
It looks like the bug is in the implementation of Gfx::fillPatch.
It subdivides the patch in 2 parts in each parameter direction and uses
recursion on each of the 4 subpatches.

This makes it possible for some points of a subpatch to be drawn over the same
points in another subpatch and this can lead to incorrect rendering.

If you want to keep the recursion structure, you should remember that you can
safely subdivide only in the v direction. If you want to subdivide along u, you
need to check some additional conditions.

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