1469565 - WR: Implement Tiled Blob Masks

Status: NEW

(Core :: Graphics: WebRender, defect, P3)

Description

[Kartikaya Gupta (email:[e-mail])]

gfx/tests/crashtests/1278305.html contains an animation that occasionally results in rendering a blob-image mask with -57 xscale applied, requiring tiling.

The fix in bug 1454187 made the crashtest not crash, but according to bug 1435896 comment 10 it's going to produce incorrect results. This bug is to track fixing it better.

Comment 1

[Kartikaya Gupta (email:[e-mail])]

Per discussion with :Gankro, bug 1454187 might actually have fixed this for reals. But we should add a test at least.

Comment 2

[Maire Reavy [:mreavy]]

Kats -- is this fixed?  Is this bug now about just adding a test?  I've moved this to stage-wr-next, but please move it back if I've misunderstood something.

Comment 3

[Aria Beingessner [:Gankra]]

We currently tile extremely large blob masks, but tiling is buggy/crashy when we try to enable it unconditionally, *especially for masks*, indicating more work needs to be done.

Comment 4

[Kartikaya Gupta (email:[e-mail])]

Based on comment 3 let's move this back to the MVP list, as tiling blobs seems to be pretty important in practice and we should make sure it's solid. Feel free to bump it back if you disagree.