1339664 - Polygonal layer geometry is not always anti-aliased

Status: RESOLVED INVALID

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

Description

[Miko Mynttinen]

When drawing polygonal layers, the anti-aliasing is turned off to prevent artifacts between internal edges. This affects at least BasicCompositor backend.

Comment 1

[Miko Mynttinen]

Relevant code: https://dxr.mozilla.org/mozilla-central/source/gfx/layers/basic/BasicCompositor.cpp#656

Comment 4

[Daniel Holbert [:dholbert]]

I've got some testcases on bug 1737904 (which I've just duped here), that helps demonstrate/visualize this issue.
2D version: https://bugzilla.mozilla.org/attachment.cgi?id=9247877
3D version: https://bugzilla.mozilla.org/attachment.cgi?id=9247878

I think it's reasonable to expect those two testcases to render the same as each other (or nearly the same); but in current Firefox (going back to bug 1323797's commits), the 3D testcase is much more jaggy/stairsteppy on its edges, apparently due to this bug.

Comment 5

[Miko Mynttinen]

This bug is no longer relevant, BasicCompositor has been removed.

Comment 6

[Daniel Holbert [:dholbert]]

OK, fair enough - thanks for un-duping bug 1737904 then.