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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/193390">193390</a></dd>
<dt>Author</dt> <dd>commit-queue@webkit.org</dd>
<dt>Date</dt> <dd>2015-12-03 16:49:48 -0800 (Thu, 03 Dec 2015)</dd>
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<h3>Log Message</h3>
<pre>Remove the use of GraphicsContextStateSaver from RenderLayer::paintLayerByApplyingTransform
https://bugs.webkit.org/show_bug.cgi?id=151829

Patch by Said Abou-Hallawa &lt;sabouhallawa@apple.com&gt; on 2015-12-03
Reviewed by Simon Fraser.

Set the CTM of the GraphicsContext to its original value before changing
it. This is a lot cheaper than using GraphicsContextStateSaver to save the
whole state of the GraphicsContext and restore it back;

* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::paintLayerByApplyingTransform):</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayercpp">trunk/Source/WebCore/rendering/RenderLayer.cpp</a></li>
</ul>

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<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (193389 => 193390)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2015-12-04 00:34:55 UTC (rev 193389)
+++ trunk/Source/WebCore/ChangeLog        2015-12-04 00:49:48 UTC (rev 193390)
</span><span class="lines">@@ -1,3 +1,17 @@
</span><ins>+2015-12-03  Said Abou-Hallawa  &lt;sabouhallawa@apple.com&gt;
+
+        Remove the use of GraphicsContextStateSaver from RenderLayer::paintLayerByApplyingTransform
+        https://bugs.webkit.org/show_bug.cgi?id=151829
+
+        Reviewed by Simon Fraser.
+
+        Set the CTM of the GraphicsContext to its original value before changing
+        it. This is a lot cheaper than using GraphicsContextStateSaver to save the
+        whole state of the GraphicsContext and restore it back;
+
+        * rendering/RenderLayer.cpp:
+        (WebCore::RenderLayer::paintLayerByApplyingTransform):
+
</ins><span class="cx"> 2015-12-03  Eric Carlson  &lt;eric.carlson@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         [MediaStream] Update MediaStreamTrack.getCapabilities
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayer.cpp (193389 => 193390)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayer.cpp        2015-12-04 00:34:55 UTC (rev 193389)
+++ trunk/Source/WebCore/rendering/RenderLayer.cpp        2015-12-04 00:49:48 UTC (rev 193390)
</span><span class="lines">@@ -4405,7 +4405,7 @@
</span><span class="cx">     // Translate the graphics context to the snapping position to avoid off-device-pixel positing.
</span><span class="cx">     transform.translateRight(devicePixelSnappedOffsetForThisLayer.width(), devicePixelSnappedOffsetForThisLayer.height());
</span><span class="cx">     // Apply the transform.
</span><del>-    GraphicsContextStateSaver stateSaver(context);
</del><ins>+    AffineTransform oldTransfrom = context.getCTM();
</ins><span class="cx">     context.concatCTM(transform.toAffineTransform());
</span><span class="cx"> 
</span><span class="cx">     // Now do a paint with the root layer shifted to be us.
</span><span class="lines">@@ -4413,6 +4413,7 @@
</span><span class="cx">     LayerPaintingInfo transformedPaintingInfo(this, LayoutRect(encloseRectToDevicePixels(transform.inverse().valueOr(AffineTransform()).mapRect(paintingInfo.paintDirtyRect), deviceScaleFactor)),
</span><span class="cx">         paintingInfo.paintBehavior, adjustedSubpixelAccumulation, paintingInfo.subtreePaintRoot, paintingInfo.overlapTestRequests);
</span><span class="cx">     paintLayerContentsAndReflection(context, transformedPaintingInfo, paintFlags);
</span><ins>+    context.setCTM(oldTransfrom);
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void RenderLayer::paintList(Vector&lt;RenderLayer*&gt;* list, GraphicsContext&amp; context, const LayerPaintingInfo&amp; paintingInfo, PaintLayerFlags paintFlags)
</span></span></pre>
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