[Webkit-unassigned] [Bug 92368] New: [META][GTK][WK2] Enable UI_SIDE_COMPOSITING for WebKit2 GTK

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=92368

           Summary: [META][GTK][WK2] Enable UI_SIDE_COMPOSITING for
                    WebKit2 GTK
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ryumiel at company100.net
                CC: mrobinson at webkit.org, noam.rosenthal at nokia.com,
                    joone at webkit.org


This is a metabug to track UI_SIDE_COMPOSITING support in WebKit2 GTK port.

QT port has already implemented this feature but unfortunately GTK port hasn't.
So, we are working to support UI_SIDE_COMPOSITING in WebKit2 GTK.

But, we need to consider the following issues.

1. UI_SIDE_COMPOSITING depends on TILED_BACKING_STORE. But GTK does not use TILED_BACKING_STORE.
    - It is hard to reuse other ports' code because of WidgetBackingStoreCairo.
    - Is TiledBackingStoreCairo far slower than WidgetBackingStoreCairo? Do we need to maintain WidgetBackingStoreCairo?

2. Current GTK port supports CLUTTER, but I do not know the current status about clutter in WebKit2.
    - Is there any activity about clutter in WebKit2? It seems a little bit hard to support clutter at same time.
    - I need some hands :)

I want comments/discussions about these issues.

My current plan to land UI_SIDE_COMPOSITING on WebKit2 Gtk:
1. Enable the "tiled backing store"
2. Enable the "ui side compositing"

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