Verified fixed with libpixman-1-0 0.38.4-0ubuntu2.
- The test program now reports "OK".
- I also installed the openslide-tools package and visually confirmed that
"openslide-write-png CMU-1.mrxs 2 10 1 1000 1000 out.png" produces
corrupt output with the original package and reasonable
** Tags removed: verification-needed-focal
** Tags added: verification-done-focal
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https://bugs.launchpad.net/bugs/1988796
Title:
Incorrect rendering triggered by cairo
Thanks for the help!
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https://bugs.launchpad.net/bugs/1988796
Title:
Incorrect rendering triggered by cairo CAIRO_OPERATOR_SATURATE with
subpixel positioning
Status
Yup, the test program fails without the packages from the PPA and
succeeds once they're installed.
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https://bugs.launchpad.net/bugs/1988796
Title:
Incorrect rendering
** Patch added: "Updated debdiff with dep3 headers added"
https://bugs.launchpad.net/ubuntu/+source/pixman/+bug/1988796/+attachment/5623244/+files/2-0.38.4-0ubuntu2.debdiff
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[ Impact ]
OpenSlide (libopenslide0 in Ubuntu) uses Cairo as its rendering backend,
always with CAIRO_OPERATOR_SATURATE and sometimes with subpixel
positioning (when reading certain file formats), and Cairo in turn
invokes this code. As a result, some slides incorrectly render with
large blank
This is a debdiff for the focal version of pixman, 0.38.4-0ubuntu1.
I've built and installed this and verified that the test case now
reports "OK".
** Patch added: "1-0.38.4-0ubuntu2.debdiff"
Public bug reported:
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
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