<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - cairo-tor-scan-converter is off by half of a subrow." href="https://bugs.freedesktop.org/show_bug.cgi?id=84396#c6">Comment # 6</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - cairo-tor-scan-converter is off by half of a subrow." href="https://bugs.freedesktop.org/show_bug.cgi?id=84396">bug 84396</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>commit 5c03b20732b84370950f0c7e5648da86ef45a571 Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Date: Mon Sep 29 08:37:56 2014 +0100 test/coverage: Exercise invariance under mirror symmetry Massimo noticed that the record/record-flip were not being rasterised as identical mirror images due to a half-subpixel offset in the tor scan converter. This test attempts to reproduce this error by rendering a rhombus around the origin of each cell (that is it generates 4 mirror images of a triangle in the 4 different orientations0. The expectation is that each pixel in the group is lit identically as the coverage is identical. References: <a class="bz_bug_link bz_status_NEW " title="NEW --- - cairo-tor-scan-converter is off by half of a subrow." href="show_bug.cgi?id=84396">https://bugs.freedesktop.org/show_bug.cgi?id=84396</a> Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> should be a good explicit test of this property. It is marked as a slow test, so needs to be run as ./cairo-test-suite -s coverage-rhombus (Not that it is that slow and cairo-test-suite should just run tests that are named explicitly.)</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>