Hi Benjamin,

Thanks for taking the time to provide this fix!

Would you be willing to file the SRU template [1] for this bug so we can
proceed here?

It would also be nice to add dep3 headers [2] to that patch.

[1] https://wiki.ubuntu.com/StableReleaseUpdates#SRU_Bug_Template
[2] https://dep-team.pages.debian.net/deps/dep3/

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https://bugs.launchpad.net/bugs/1988796

Title:
  Incorrect rendering triggered by cairo CAIRO_OPERATOR_SATURATE with
  subpixel positioning

Status in pixman package in Ubuntu:
  New

Bug description:
  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.

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