[Webkit-unassigned] [Bug 151829] New: Remove the use of GraphicsContextStateSaver from RenderLayer::paintLayerByApplyingTransform

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151829

            Bug ID: 151829
           Summary: Remove the use of GraphicsContextStateSaver from
                    RenderLayer::paintLayerByApplyingTransform
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: simon.fraser at apple.com

Saving/Restoring the GraphicsContext is an expensive operation. It should be used when the number to save/restore options in the context is large. But when only one option is set and later is restored, it is a lot cheaper to do that save/restore explicitly.

Here are some results:

When using GraphicsContextStateSaver in RenderLayer::paintLayerByApplyingTransform:

Test Name        Score    Complexity                    FPS    
                    Avg.    W.5%    Std.    %    Avg.    W.5%    Std.    %    

CSS bouncing circles    419.84    444.72    396.34    25.86    5.82    49.53    44.73    2.30    4.65



When removing GraphicsContextStateSaver from RenderLayer::paintLayerByApplyingTransform:

Test Name        Score    Complexity                    FPS    
                    Avg.    W.5%    Std.    %    Avg.    W.5%    Std.    %    

CSS bouncing circles    491.74    532.11    454.44    38.40    7.22    48.66    43.87    2.84    5.83

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