1431013 - Ignore WebGL powerPreference if no "webglcontextlost" and "webglcontextrestored" event listeners exist

Status: NEW

(Core :: Graphics: CanvasWebGL, enhancement, P3)

Description

[Daosheng Mu[:daoshengmu]]

According to WebGL spec [1], "At WebGLRenderingContext creation time, this attribute will be ignored if no event listeners exist which would handle both "webglcontextlost" and "webglcontextrestored" events dispatched to the canvas element.", we should detect if there are these events under the HTMLCanvasElement for WebGL powerPreference attribute.

[1] https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.2.1

Comment 1

[Daosheng Mu[:daoshengmu]]

Attachment: Bug 1431013 - Activate powerPreference attribute only when has events;

In WebGL spec mention, this `powerPreference` attribute will be ignored if no event listeners exist which would handle both "webglcontextlost" and "webglcontextrestored" events dispatched to the canvas element.

Review commit: https://reviewboard.mozilla.org/r/213484/diff/#index_header
See other reviews: https://reviewboard.mozilla.org/r/213484/

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The bug assignee didn't login in Bugzilla in the last 7 months.
:jgilbert, could you have a look please?
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