[Bug 1988796] [NEW] Incorrect rendering triggered by cairo CAIRO_OPERATOR_SATURATE with subpixel positioning

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

pixman 0.38.4-0ubuntu1 in focal (and actually pixman 0.38.x generally)
has a regression that causes incorrect rendering in some circumstances.
This can be triggered by the use of cairo with CAIRO_OPERATOR_SATURATE
and subpixel positioning, and causes OpenSlide <https://openslide.org/>
to produce incorrect output.

The attached test program will print "Failed" if the bug exists, or "OK"
if it doesn't.

This is fixed upstream in
https://gitlab.freedesktop.org/pixman/pixman/-/commit/8256c235, which is
in pixman 0.40.0.

See https://github.com/openslide/openslide/issues/278 for more context.

** Affects: pixman (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch
-- 
Incorrect rendering triggered by cairo CAIRO_OPERATOR_SATURATE with subpixel positioning
https://bugs.launchpad.net/bugs/1988796
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