Bug 52582 – WebView should paint directly into a GraphicsLayer when in accelerated compositing mode

• Component: New Bugs
• Status: RESOLVED FIXED

[Adam Roben (:aroben)]

WebView should paint directly into a GraphicsLayer when in accelerated compositing mode

[Adam Roben (:aroben)]

Created attachment 79179 [details]
Paint directly into a GraphicsLayer when using accelerated compositing

[Simon Fraser (smfr)]

Comment on attachment 79179 [details]
Paint directly into a GraphicsLayer when using accelerated compositing

View in context: https://bugs.webkit.org/attachment.cgi?id=79179&action=review

> Source/WebCore/ChangeLog:11
> +        Remove special-cased support for providing content for the root layer
> +
> +        Clients will just have to provide content through the normal
> +        GraphicsLayer channels now!
> +
> +        Support for <http://webkit.org/b/52582> WebView should paint directly
> +        into a GraphicsLayer when in accelerated compositing mode
> +
> +        Reviewed by NOBODY (OOPS!).

The order of these paragraphs is backwards.

> WebKit/win/ChangeLog:23
> +        Paint directly into a GraphicsLayer when using accelerated compositing
> +
> +        Before this patch, we were painting into our normal backing store
> +        HBITMAP, wrapping it in a CGImage, and handing it off to Core
> +        Animation. This had at least two disadvantages:
> +           1) The bitmap could be modified while Core Animation was using it.
> +           2) It introduced extra complexity.
> +
> +        When entering accelerated compositing mode, WebView now creates a
> +        GraphicsLayer to draw into. This GraphicsLayer sits between the root
> +        layer (owned by WKCACFLayerRenderer) and the RenderView's layer. When
> +        WebView invalidates, it just calls setNeedsDisplayInRect on its
> +        GraphicsLayer. When WebView paints, it just tells its
> +        WKCACFLayerRenderer to paint, which will call back to WebView to draw
> +        into the GraphicsLayer if it has a dirty region. This is very similar
> +        to the current implementation of LayerBackedDrawingArea in WebKit2.
> +
> +        Fixes <http://webkit.org/b/52582> WebView should paint directly into a
> +        GraphicsLayer when in accelerated compositing mode
> +
> +        Reviewed by NOBODY (OOPS!).

Backwards paragraphs.

[Adam Roben (:aroben)]

Committed r75987: <http://trac.webkit.org/changeset/75987>