Created attachment 244009 [details]
1 pixel offset overlapping region
In TextureMapperLayer::paintUsingOverlapRegions, there is a check to avoid dividing the area between overlapping and nonoverlapping. The current check is
if (overlapRegion.bounds().size().area() > nonOverlapRegion.bounds().size().area())
However, I think it is incorrect. If the overlap region is just 1 pixel small from all the 4 side, this check would not catch that. Attached an html that reproduces the issue.
Seems to me that the correct check should be
if (overlapRegion.totalArea() > nonOverlapRegion.totalArea)
The code was added by r149369 (Bug 115226).
(In reply to abaldeva from comment #0)
> Seems to me that the correct check should be
> if (overlapRegion.totalArea() > nonOverlapRegion.totalArea)
It sounds like a good idea to me. Will prepare a patch.
Created attachment 460152 [details]
gtk-wk2 EWS reports a test failure.
imported/w3c/web-platform-tests/css/css-transforms/transform3d-rotatex-perspective-003.html [ ImageOnlyFailure ]
This is a true-positive. Created bug#241568 for it.
Created attachment 460215 [details]
Committed r295542 (251547@main): <https://commits.webkit.org/251547@main>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 460215 [details].