[Webkit-unassigned] [Bug 140753] New: Poor performance on IE's Chalkboard benchmark

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140753

            Bug ID: 140753
           Summary: Poor performance on IE's Chalkboard benchmark
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: zimmermann at kde.org

On the same machine, the benchmark http://ie.microsoft.com/testdrive/Performance/Chalkboard/ is tested with different window sizes:

Window size (2560 x 1260):
Safari 10600.3.14: 70.60 sec
FireFox: 120.40 sec
Chrome: 26.21

Window size (800 x 600):
Safari 10600.3.14: 6.49 sec
FireFox: 98.74 sec
Chrome: 8.14 sec

The reason for having WebKit slower on this benchmark, with larger widow size, is the SVG rendering code does not skip the SVG elements which are outside the clipping rectangle. We draw the all SVG elements even if some of them are completely outside the clipping rectangle. This is very costly with complex primitives like the <path>. The fix is to propagate the correct clipping rectangle in the PaintingInfo when passing it to the SVGShape::paint().

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