[Webkit-unassigned] [Bug 100020] New: [BlackBerry] Improve the use of stencil buffer during compositing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100020

           Summary: [BlackBerry] Improve the use of stencil buffer during
                    compositing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit BlackBerry
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fspacek at rim.com


Stenciling is required only rarely so the common code path should not touch the stencil buffer at all and setup any stenciling state on-demand. In particular, currently LayerRenderer::setViewport unconditionally clears the stencil buffer even in the case where there is nothing at all to composite. This patch also removes the ENABLE_SCISSOR define as it has been empirically determined that careful scissoring is always a win on all platforms.

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