[Webkit-unassigned] [Bug 160389] New: [GTK] Move the redirected XComposite window to the web process

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160389

            Bug ID: 160389
           Summary: [GTK] Move the redirected XComposite window to the web
                    process
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org

In the current code, the UI process creates the redirected window that the web process uses to render accelerated contents. The redirected window is sent to the web process as native surface handle, and using Xdamage extension the UI process takes a pixmap of the redirected window to render into the widget when there are updates. This requires several points of synchronization between UI and web process. When the web view is resized, the UI process first resizes the redirected window and then sends a new backing store ID to the web process. The time between the redirected window is resized and the web process renders the new contents the UI process keeps rendering the previous contents with the previous size in the new window with the new size. This makes the resize process slow, and it produces rendering artifacts quite often. The redirected window is created when the web view is realized, to be able to inherit the Xvisual from the parent window, and the native window handle is sent

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