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Created attachment 1909395 [details]
Test program

Description of problem:
pixman 0.38.x 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.

Version-Release number of selected component (if applicable):
0.38.4-2.el8.x86_64

How reproducible:
Always

Steps to Reproduce:
Compile and run attached test program.

Actual results:
Program prints "Failed"

Expected results:
Program prints "OK"

Additional info:
This is fixed upstream in https://gitlab.freedesktop.org/pixman/pixman/-/commit/8256c235d9b3854d039242356905eca854a890ba, which is in pixman 0.40.0.

Fix posted in https://gitlab.com/redhat/centos-stream/rpms/pixman/-/merge_requests/2.

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