1949937 - [wpt-sync] Sync PR 50892 - compositing: Move image output and shutdown management out of the compositor

Status: RESOLVED INVALID

(Testing :: web-platform-tests, task, P4)

Description

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

Sync web-platform-tests PR 50892 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/50892
Details from upstream follow.

Martin Robinson <[e-mail]> wrote:

compositing: Move image output and shutdown management out of the compositor

This is a step toward the renderer-per-WebView goal. It moves various details out of IOCompositor.

• Image output: This is moved to servoshell as now applications can access the image contents of a WebView via RenderingContext::read_to_image. Most options for this are moved to ServoShellPreferences apart from wait_for_stable_image as this requires a specific kind of coordination in the ScriptThread that is also very expensive. Instead, paint is now simply delayed until a stable image is reached and WebView::paint() returns a boolean. Maybe this can be revisited in the future.
• Shutdown: Shutdown is now managed by libservo itself. Shutdown state is shared between the compositor and Servo instance. In the future, this sharing might be unecessary.
• CompositeTarget has been removed entirely. This no longer needs to be passed when creating a Servo instance.

This is an attempt to land #50836 which seems to be wedged.