Launchpad has imported 5 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=60489.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2013-02-08T12:16:22+00:00 Finnian Reilly wrote: Created attachment 74421 Test SVG file for script scaling.py The 1.12.2 and 1.12.10 versions of libcairo2 introduces a rendering bug that was not present in version 1.10.2. It is possible the bug may also be in later versions. The rendering problem shows up when using the rsvg utility to convert the attached SVG file to PNG format. (See package librsvg2-bin) TO REPRODUCE THE BUG On my machine I am running Ubuntu 12.10 amd64 which has libcairo2-1.12.2. Save the attached file 'waterfall.svg.gz' and Python script 'scaling.py' into a test directory. Unzip the SVG file with gunzip. Make sure package librsvg2-bin is installed. File: scaling.py import subprocess for width in range (400, 900, 100): print 'Converting to width:', width subprocess.call (['rsvg', '--width', str (width), 'waterfall.svg', ,waterfall.%s.png' % width]) Run the script from the command line. The script outputs 5 PNG files ranging in width from 400 to 800. The first and last PNG do not have any problem, but the 500, 600 and 700 width files all have major artifacts. TESTING VARIOUS LIBCAIRO2 VERSIONS Create a subdirectory 'libs'. Into this directory extract the shared object 'libcairo.so.2.xxxxx.x' for various versions. Select the one for testing by creating a link. This selects the 1.10.2 version: ln libs/libcairo.so.2.11000.2 libs/libcairo.so.2 set the library path as follows export LD_LIBRARY_PATH=libs Run the test script again and examine the output. You will find that the 1.10.2 version produces images without any artifacts. This bug has also been reported here with a different wording.+ https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1119304 Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1119304/comments/3 ------------------------------------------------------------------------ On 2013-02-08T12:18:28+00:00 Finnian Reilly wrote: Created attachment 74422 Python test script for waterfal.svg Use the script to reproduce the bug Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1119304/comments/4 ------------------------------------------------------------------------ On 2013-02-08T12:25:11+00:00 Finnian Reilly wrote: Created attachment 74423 Compressed SVG test file for script The first time I uploaded it I forgot to set the content type to 'auto- detect'. Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1119304/comments/5 ------------------------------------------------------------------------ On 2013-02-08T12:27:17+00:00 Finnian Reilly wrote: Comment on attachment 74421 Test SVG file for script scaling.py Please ignore this bad upload. I don't know how to delete it. Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1119304/comments/6 ------------------------------------------------------------------------ On 2013-02-08T13:14:43+00:00 Chris Wilson wrote: commit 8cfbdf2f02ba01d5638a91c9f3f7fc228b402caa Author: Chris Wilson <[email protected]> Date: Fri Feb 8 13:10:25 2013 +0000 polygon: Only rely on the computed boundary intersections for crossing edges If we need to extrapolate the edge to the boundary, then we run the risk of an overflow for an immaterial result. So if the edge does not cross the boundary, we can simply use the corresponding end-point and not emit the boundary segment. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=60489 Signed-off-by: Chris Wilson <[email protected]> Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1119304/comments/8 ** Changed in: cairo Status: Unknown => Fix Released ** Changed in: cairo Importance: Unknown => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1119304 Title: Regression problem with libcairo2 (1.12.2) found in Quantal To manage notifications about this bug go to: https://bugs.launchpad.net/cairo/+bug/1119304/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
