compositing: Move image output and shutdown management out of the compositor #50892
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…positor 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. Co-authored-by: Ngo Iok Ui (Wu Yu Wei) <[email protected]> Signed-off-by: Martin Robinson <[email protected]>
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This is a step toward the renderer-per-WebView goal. It moves various details out of
IOCompositor.WebViewviaRenderingContext::read_to_image. Most options for this are moved toServoShellPreferencesapart fromwait_for_stable_imageas this requires a specific kind of coordination in theScriptThreadthat is also very expensive. Instead, paint is now simply delayed until a stable image is reached andWebView::paint()returns a boolean. Maybe this can be revisited in the future.Servoinstance. In the future, this sharing might be unecessary.CompositeTargethas 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.