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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Remove the use of GraphicsContextStateSaver from RenderLayer::paintLayerByApplyingTransform"
href="https://bugs.webkit.org/show_bug.cgi?id=151829">151829</a>
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<th>Summary</th>
<td>Remove the use of GraphicsContextStateSaver from RenderLayer::paintLayerByApplyingTransform
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>Layout and Rendering
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>sabouhallawa@apple.com
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<th>CC</th>
<td>simon.fraser@apple.com
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<pre>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</pre>
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