[Webkit-unassigned] [Bug 168911] New: [GTK] Flickering when leaving accelerated compositing mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=168911

            Bug ID: 168911
           Summary: [GTK] Flickering when leaving accelerated compositing
                    mode
    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

It doesn't always happen, and it too fast, more noticeable in website with a dark background, because we are drawing a single white fame. This happens when we leave AC mode and the threaded compositor is still rendering a frame. The render layer compositor already detached the root layer, so the threaded compositor doesn't actually render any of its layer (the backing store of all the layers has been destroyed at this point). However, CoordinatedGraphicsScene::paintToCurrentGLContext() always renders a white background when no web view color has been set. And that's the white frame we get. Rendering the web view background in CoordinatedGraphicsScene::paintToCurrentGLContext() is not needed at all, because the web view already takes care of rendering its background. So, we can simply remove the  m_viewBackgroundColor member from CoordinatedGraphicsScene because nobody is actually calling setViewBackgroundColor() and we never want to draw a white background either.

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