[Webkit-unassigned] [Bug 10455] New: WebKit should not use RenderLayer for overflow clipping

[bugzilla-daemon at opendarwin.org]

http://bugzilla.opendarwin.org/show_bug.cgi?id=10455

           Summary: WebKit should not use RenderLayer for overflow clipping
           Product: WebKit
           Version: 420+ (nightly)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: normal
          Priority: P4
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at opendarwin.org
        ReportedBy: macdome at opendarwin.org
                CC: hyatt at apple.com


WebKit should not use RenderLayer for overflow clipping

On our site, in order to stop an invisible overflow on our main div (which
causes the scroll bars to appear too soon when shrinking the window) we added
overflow: hidden.  This overflow: hidden added a *perceptible* delay during
redraw in Safari.

Having worked in the render tree, I know that Safari uses a RenderLayer for
overflow clipping.  In my last talks with hyatt, he seemed to agree this was
unnecessary (SVG for example does not us a layer for any clipping).  It is my
belief that removing the use of this layer will help speed up this redraw.


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