1780660 - [wpt-sync] Sync PR 34930 - Set contents_opaque(false) if the background color is transparent

Status: RESOLVED FIXED

(Core :: Web Painting, task, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 34930 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/34930
Details from upstream follow.

Xianzhu Wang <[e-mail]> wrote:

Set contents_opaque(false) if the background color is transparent

Previously if a layer's background was transparent and the layer is
opaque, we used the layer_tree_host's background as
SafeOpaqueBackgroundColor(). However, the color might be dramatically
different from the normal color in the layer, causing edge artifacts.

Now set contents_opaque(false) in the case.

The case of opaque layer not having a background color only happens
in cases such as the layer has an opaque background image. In such
cases, case, using any heuristic color as the
SafeOpaqueBackgroundColor() may be inappropriate.

Bug: 1330509
Change-Id: I91edeb1c02da5eaa38ea0431f0559775b273f418
Reviewed-on: https://chromium-review.googlesource.com/3779000
WPT-Export-Revision: 579c100ea45bc7e5c34fbbbf47e85df53e696d09

Comment 1

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Pushed to try (stability) https://treeherder.mozilla.org/#/jobs?repo=try&revision=5b31a7085ed2ad2ccb2f47fe6e1928fe39e85948

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/c4e86ed7f2b5
[wpt PR 34930] - Set contents_opaque(false) if the background color is transparent, a=testonly

Comment 3

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 4

[Atila Butkovits]

https://hg.mozilla.org/mozilla-central/rev/c4e86ed7f2b5