54471 2011-02-15 09:24:37 -0800 [GTK][CAIRO] Some canvas arc tests fail because of a bug in Cairo arc rendering 2012-10-08 13:30:23 -0700 1 1 1 Unclassified WebKit Canvas 528+ (Nightly build) PC Linux RESOLVED DUPLICATE 97658 Gtk, LayoutTestFailure P2 Normal --- 54458 0 zan webkit-unassigned d-r leandro mdelaney7 mrobinson otte rakuco oldest_to_newest 351345 0 82473 zan 2011-02-15 09:24:37 -0800 Created attachment 82473 Comparison image There are two tests that fail because Cairo's preset tolerance is too big. The tests are: -canvas/philip/tests/2d.path.arc.selfintersect.1.html -canvas/philip/tests/2d.path.arc.shape.3.html Both tests draw arcs, but arcs in Cairo are drawn by being split into segments. Because of the default tolerance being too big these segments are not precise enough (there are too many and are too big) so they end up expanding the arc furthermore, making these tests fail. I'm attaching a comparison image that furthermore illustrates the problem. 351372 1 82480 zan 2011-02-15 10:06:27 -0800 Created attachment 82480 Use smaller tolerance This patch sets Cairo's tolerance to 0.01 and enables two canvas tests that now succeed. 351432 2 otte 2011-02-15 11:43:56 -0800 This is a Cairo bug. I committed a testcase to the cairo testsuite at http://cgit.freedesktop.org/cairo/commit/?id=4d4056872db94573183473610ad1d81d5439fdc6 and hope our developers will take care of it there. Increasing the tolerance hides this bug (just increase the test size to get it back) at the cost of performance, so it's definitely not the right fix. 351546 3 mrobinson 2011-02-15 13:54:41 -0800 (In reply to comment #2) > This is a Cairo bug. I committed a testcase to the cairo testsuite at http://cgit.freedesktop.org/cairo/commit/?id=4d4056872db94573183473610ad1d81d5439fdc6 and hope our developers will take care of it there. > > Increasing the tolerance hides this bug (just increase the test size to get it back) at the cost of performance, so it's definitely not the right fix. Thanks for the update, Benjamin. Is there a work-around (other than decreasing the tolerance) that we can make on our side? I'm guessing not. :( 351550 4 otte 2011-02-15 13:56:46 -0800 I can't think of a workaround, no. 351882 5 82480 zan 2011-02-15 21:59:12 -0800 Comment on attachment 82480 Use smaller tolerance Removing the review flag. 357400 6 mrobinson 2011-02-24 14:34:42 -0800 (In reply to comment #5) > (From update of attachment 82480 [details]) > Removing the review flag. Benjamin, is there a bug report somewhere so we can track this and unskip the tests once the bots have the appropriate version of Cairo? 363108 7 zan 2011-03-06 11:55:10 -0800 (In reply to comment #6) > (In reply to comment #5) > > (From update of attachment 82480 [details] [details]) > > Removing the review flag. > > Benjamin, is there a bug report somewhere so we can track this and unskip the tests once the bots have the appropriate version of Cairo? A test case has already been committed into cairo tree[1], but I do not think this has been fixed yet. [1] http://cgit.freedesktop.org/cairo/commit/?id=4d4056872db94573183473610ad1d81d5439fdc6 728406 8 d-r 2012-09-26 04:44:53 -0700 This is fixed in newer versions of cairo, we're working on bumping it in bug 97658. *** This bug has been marked as a duplicate of bug 97658 *** 82473 2011-02-15 09:24:37 -0800 2011-02-15 09:24:37 -0800 Comparison image tolerance.png image/png 11472 zan iVBORw0KGgoAAAANSUhEUgAAAfQAAAD6CAYAAABXq7VOAAAAAXNSR0IArs4c6QAAAAZiS0dEAP8A /wD/oL2nkwAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9sCDxERAja9jgEAAAAZdEVYdENv bW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAgAElEQVR42u3de3gTdb4G8Ddt0kva0huruNws gqDVUl0Q5Wa5CGIRKK0HLOKi4gVcz1k9y21dDn0ed5cCPsAenmcfl666IOUO24OCWEEQPJWyRSoI AmUBoVArBdomoUma9nv+mE0OaZpL26RNwvt5nj7KZGYyv+9k8mZmfjOjEhEBERERBbQQloCIiIiB TkRERAx0IiIiYqATERERA52IiIiBTkRERAx0IiIiYqATERERA52IiIiBTkRERAx0IiIiYqATERER A52IiIiBTkRERAz01lKpVFCpVD4bPxDaFIxtMBqNmDdvHpKSkqDRaHxej2CoORFRuwd6UlISVCoV SktL7YZ/9dVXti9WlUqFs2fP2r1eWloKlUqFXr16dfiXs8ViwZo1azBu3Dh06dIFYWFhiI6OxoMP 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