Hello Benjamin, or anyone else affected, Accepted pixman into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/pixman/0.38.4-0ubuntu2 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed- focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification- failed-focal. In either case, without details of your testing we will not be able to proceed. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping! N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days. ** Changed in: pixman (Ubuntu Focal) Status: In Progress => Fix Committed ** Tags added: verification-needed verification-needed-focal -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pixman in Ubuntu. https://bugs.launchpad.net/bugs/1988796 Title: Incorrect rendering triggered by cairo CAIRO_OPERATOR_SATURATE with subpixel positioning Status in pixman package in Ubuntu: Fix Released Status in pixman source package in Focal: Fix Committed Bug description: [ 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 spaces and with some pixels rendered on top of other pixels. This effectively makes OpenSlide unusable for several of the file formats it supports. No workaround is believed possible within the OpenSlide codebase. [ Test Plan ] Compile and run the pixman.c test program uploaded to this bug. It should report "OK". [ Where problems could occur ] Problems would show up as incorrect pixel output from software that renders via Cairo or pixman. [ Other Info ] While I'm not a pixman expert, it appears that the change should only affect the broken code path, and it seems unlikely that anything else depends on the incorrect math fixed by this patch. This bug hasn't previously been reported in Ubuntu, which may imply that this code path is not exercised by other packages in the distro. The affected source file has had no further commits upstream since this patch was applied in April 2019, and some basic commit grepping didn't turn up any followup fixes elsewhere in the tree. [ Original message ] 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pixman/+bug/1988796/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
