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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/161452">161452</a></dd>
<dt>Author</dt> <dd>commit-queue@webkit.org</dd>
<dt>Date</dt> <dd>2014-01-07 13:27:10 -0800 (Tue, 07 Jan 2014)</dd>
</dl>

<h3>Log Message</h3>
<pre>Unreviewed, rolling out <a href="http://trac.webkit.org/projects/webkit/changeset/161447">r161447</a>.
http://trac.webkit.org/changeset/161447
https://bugs.webkit.org/show_bug.cgi?id=126592

needs some more work (Requested by thorton on #webkit).

Source/WebCore:

* WebCore.exp.in:
* page/FrameView.cpp:
(WebCore::FrameView::FrameView):
* page/FrameView.h:
* platform/graphics/GraphicsLayerClient.h:
* platform/graphics/TiledBacking.h:
* platform/graphics/ca/GraphicsLayerCA.h:
* platform/graphics/ca/PlatformCALayerClient.h:
* platform/graphics/ca/mac/TileController.h:
* platform/graphics/ca/mac/TileController.mm:
(WebCore::TileController::TileController):
(WebCore::TileController::tilesWouldChangeForVisibleRect):
(WebCore::TileController::setExposedRect):
(WebCore::TileController::setClipsToExposedRect):
(WebCore::TileController::computeTileCoverageRect):
(WebCore::TileController::revalidateTiles):
(WebCore::TileController::updateTileCoverageMap):
* rendering/RenderLayerBacking.cpp:
(WebCore::computeTileCoverage):
* rendering/RenderLayerBacking.h:

Source/WebKit2:

* UIProcess/API/mac/WKView.mm:
(-[WKView _updateViewExposedRect]):
* UIProcess/DrawingAreaProxy.cpp:
(WebKit::DrawingAreaProxy::DrawingAreaProxy):
* UIProcess/DrawingAreaProxy.h:
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::WebPageProxy):
(WebKit::WebPageProxy::close):
(WebKit::WebPageProxy::viewExposedRectChanged):
(WebKit::WebPageProxy::exposedRectChangedTimerFired):
* UIProcess/WebPageProxy.h:
(WebKit::WebPageProxy::viewExposedRect):
* WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage):
* WebProcess/WebPage/DrawingArea.h:
(WebKit::DrawingArea::setExposedRect):
(WebKit::DrawingArea::setClipsToExposedRect):
* WebProcess/WebPage/DrawingArea.messages.in:
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::viewExposedRectChanged):
* WebProcess/WebPage/WebPage.h:
* WebProcess/WebPage/WebPage.messages.in:
* WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.h:
* WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm:
(WebKit::RemoteLayerTreeDrawingArea::RemoteLayerTreeDrawingArea):
(WebKit::RemoteLayerTreeDrawingArea::setClipsToExposedRect):
(WebKit::RemoteLayerTreeDrawingArea::updateScrolledExposedRect):
(WebKit::RemoteLayerTreeDrawingArea::updateMainFrameClipsToExposedRect):
* WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h:
* WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm:
(WebKit::TiledCoreAnimationDrawingArea::TiledCoreAnimationDrawingArea):
(WebKit::TiledCoreAnimationDrawingArea::flushLayers):
(WebKit::TiledCoreAnimationDrawingArea::setClipsToExposedRect):
(WebKit::TiledCoreAnimationDrawingArea::updateScrolledExposedRect):
(WebKit::TiledCoreAnimationDrawingArea::updateMainFrameClipsToExposedRect):
(WebKit::TiledCoreAnimationDrawingArea::setRootCompositingLayer):
(WebKit::TiledCoreAnimationDrawingArea::createPageOverlayLayer):
(WebKit::TiledCoreAnimationDrawingArea::didCommitChangesForLayer):</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreWebCoreexpin">trunk/Source/WebCore/WebCore.exp.in</a></li>
<li><a href="#trunkSourceWebCorepageFrameViewcpp">trunk/Source/WebCore/page/FrameView.cpp</a></li>
<li><a href="#trunkSourceWebCorepageFrameViewh">trunk/Source/WebCore/page/FrameView.h</a></li>
<li><a href="#trunkSourceWebCoreplatformgraphicsGraphicsLayerClienth">trunk/Source/WebCore/platform/graphics/GraphicsLayerClient.h</a></li>
<li><a href="#trunkSourceWebCoreplatformgraphicsTiledBackingh">trunk/Source/WebCore/platform/graphics/TiledBacking.h</a></li>
<li><a href="#trunkSourceWebCoreplatformgraphicscaGraphicsLayerCAh">trunk/Source/WebCore/platform/graphics/ca/GraphicsLayerCA.h</a></li>
<li><a href="#trunkSourceWebCoreplatformgraphicscaPlatformCALayerClienth">trunk/Source/WebCore/platform/graphics/ca/PlatformCALayerClient.h</a></li>
<li><a href="#trunkSourceWebCoreplatformgraphicscamacTileControllerh">trunk/Source/WebCore/platform/graphics/ca/mac/TileController.h</a></li>
<li><a href="#trunkSourceWebCoreplatformgraphicscamacTileControllermm">trunk/Source/WebCore/platform/graphics/ca/mac/TileController.mm</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayerBackingcpp">trunk/Source/WebCore/rendering/RenderLayerBacking.cpp</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayerBackingh">trunk/Source/WebCore/rendering/RenderLayerBacking.h</a></li>
<li><a href="#trunkSourceWebKit2ChangeLog">trunk/Source/WebKit2/ChangeLog</a></li>
<li><a href="#trunkSourceWebKit2UIProcessAPImacWKViewmm">trunk/Source/WebKit2/UIProcess/API/mac/WKView.mm</a></li>
<li><a href="#trunkSourceWebKit2UIProcessDrawingAreaProxycpp">trunk/Source/WebKit2/UIProcess/DrawingAreaProxy.cpp</a></li>
<li><a href="#trunkSourceWebKit2UIProcessDrawingAreaProxyh">trunk/Source/WebKit2/UIProcess/DrawingAreaProxy.h</a></li>
<li><a href="#trunkSourceWebKit2UIProcessWebPageProxycpp">trunk/Source/WebKit2/UIProcess/WebPageProxy.cpp</a></li>
<li><a href="#trunkSourceWebKit2UIProcessWebPageProxyh">trunk/Source/WebKit2/UIProcess/WebPageProxy.h</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebCoreSupportWebFrameLoaderClientcpp">trunk/Source/WebKit2/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPageDrawingAreah">trunk/Source/WebKit2/WebProcess/WebPage/DrawingArea.h</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPageDrawingAreamessagesin">trunk/Source/WebKit2/WebProcess/WebPage/DrawingArea.messages.in</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPageWebPagecpp">trunk/Source/WebKit2/WebProcess/WebPage/WebPage.cpp</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPageWebPageh">trunk/Source/WebKit2/WebProcess/WebPage/WebPage.h</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPageWebPagemessagesin">trunk/Source/WebKit2/WebProcess/WebPage/WebPage.messages.in</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPagemacRemoteLayerTreeDrawingAreah">trunk/Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.h</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPagemacRemoteLayerTreeDrawingAreamm">trunk/Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPagemacTiledCoreAnimationDrawingAreah">trunk/Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h</a></li>
<li><a href="#trunkSourceWebKit2WebProcessWebPagemacTiledCoreAnimationDrawingAreamm">trunk/Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/ChangeLog        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -1,3 +1,32 @@
</span><ins>+2014-01-07  Commit Queue  &lt;commit-queue@webkit.org&gt;
+
+        Unreviewed, rolling out r161447.
+        http://trac.webkit.org/changeset/161447
+        https://bugs.webkit.org/show_bug.cgi?id=126592
+
+        needs some more work (Requested by thorton on #webkit).
+
+        * WebCore.exp.in:
+        * page/FrameView.cpp:
+        (WebCore::FrameView::FrameView):
+        * page/FrameView.h:
+        * platform/graphics/GraphicsLayerClient.h:
+        * platform/graphics/TiledBacking.h:
+        * platform/graphics/ca/GraphicsLayerCA.h:
+        * platform/graphics/ca/PlatformCALayerClient.h:
+        * platform/graphics/ca/mac/TileController.h:
+        * platform/graphics/ca/mac/TileController.mm:
+        (WebCore::TileController::TileController):
+        (WebCore::TileController::tilesWouldChangeForVisibleRect):
+        (WebCore::TileController::setExposedRect):
+        (WebCore::TileController::setClipsToExposedRect):
+        (WebCore::TileController::computeTileCoverageRect):
+        (WebCore::TileController::revalidateTiles):
+        (WebCore::TileController::updateTileCoverageMap):
+        * rendering/RenderLayerBacking.cpp:
+        (WebCore::computeTileCoverage):
+        * rendering/RenderLayerBacking.h:
+
</ins><span class="cx"> 2014-01-07  Tim Horton  &lt;timothy_horton@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         TileController can fail to receive exposedRect from the drawing area if set at the wrong time
</span></span></pre></div>
<a id="trunkSourceWebCoreWebCoreexpin"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/WebCore.exp.in (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/WebCore.exp.in        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/WebCore.exp.in        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -1265,7 +1265,6 @@
</span><span class="cx"> __ZN7WebCore9FrameView13setNodeToDrawEPNS_4NodeE
</span><span class="cx"> __ZN7WebCore9FrameView14adjustViewSizeEv
</span><span class="cx"> __ZN7WebCore9FrameView14invalidateRectERKNS_7IntRectE
</span><del>-__ZN7WebCore9FrameView14setExposedRectENS_9FloatRectE
</del><span class="cx"> __ZN7WebCore9FrameView14setNeedsLayoutEv
</span><span class="cx"> __ZN7WebCore9FrameView14setTransparentEb
</span><span class="cx"> __ZN7WebCore9FrameView15setFooterHeightEi
</span><span class="lines">@@ -1581,7 +1580,6 @@
</span><span class="cx"> __ZNK7WebCore15GraphicsLayerCA24dumpAdditionalPropertiesERNS_10TextStreamEij
</span><span class="cx"> __ZNK7WebCore15GraphicsLayerCA25shouldRepaintOnSizeChangeEv
</span><span class="cx"> __ZNK7WebCore15GraphicsLayerCA26backingStoreMemoryEstimateEv
</span><del>-__ZNK7WebCore15GraphicsLayerCA26platformCALayerExposedRectEv
</del><span class="cx"> __ZNK7WebCore15GraphicsLayerCA30visibleRectChangeRequiresFlushERKNS_9FloatRectE
</span><span class="cx"> __ZNK7WebCore15GraphicsLayerCA32platformCALayerDeviceScaleFactorEv
</span><span class="cx"> __ZNK7WebCore15GraphicsLayerCA33platformCALayerShowRepaintCounterEPNS_15PlatformCALayerE
</span><span class="lines">@@ -1858,7 +1856,6 @@
</span><span class="cx"> __ZThn???_NK7WebCore15GraphicsLayerCA32platformCALayerDeviceScaleFactorEv
</span><span class="cx"> __ZThn???_NK7WebCore15GraphicsLayerCA33platformCALayerShowRepaintCounterEPNS_15PlatformCALayerE
</span><span class="cx"> __ZThn???_NK7WebCore15GraphicsLayerCA49platformCALayerContentsScaleMultiplierForNewTilesEPNS_15PlatformCALayerE
</span><del>-__ZThn???_NK7WebCore15GraphicsLayerCA26platformCALayerExposedRectEv
</del><span class="cx"> _filenameByFixingIllegalCharacters
</span><span class="cx"> _hasCaseInsensitivePrefix
</span><span class="cx"> _hasCaseInsensitiveSubstring
</span></span></pre></div>
<a id="trunkSourceWebCorepageFrameViewcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/FrameView.cpp (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/FrameView.cpp        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/page/FrameView.cpp        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -201,7 +201,6 @@
</span><span class="cx">     , m_deferredRepaintTimer(this, &amp;FrameView::deferredRepaintTimerFired)
</span><span class="cx">     , m_isTrackingRepaints(false)
</span><span class="cx">     , m_shouldUpdateWhileOffscreen(true)
</span><del>-    , m_exposedRect(FloatRect::infiniteRect())
</del><span class="cx">     , m_deferSetNeedsLayouts(0)
</span><span class="cx">     , m_setNeedsLayoutWasDeferred(false)
</span><span class="cx"> #if PLATFORM(IOS)
</span><span class="lines">@@ -4372,17 +4371,4 @@
</span><span class="cx">         protectedWidgets[i]-&gt;notifyWidget(notification);
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-void FrameView::setExposedRect(FloatRect exposedRect)
-{
-    m_exposedRect = exposedRect;
-
-#if USE(ACCELERATED_COMPOSITING)
-    // FIXME: We should support clipping to the exposed rect for subframes as well.
-    if (m_frame-&gt;isMainFrame()) {
-        if (TiledBacking* tiledBacking = this-&gt;tiledBacking())
-            tiledBacking-&gt;exposedRectDidChange();
-    }
-#endif
-}
-
</del><span class="cx"> } // namespace WebCore
</span></span></pre></div>
<a id="trunkSourceWebCorepageFrameViewh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/FrameView.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/FrameView.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/page/FrameView.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -445,9 +445,6 @@
</span><span class="cx"> 
</span><span class="cx">     void addTrackedRepaintRect(const IntRect&amp;);
</span><span class="cx"> 
</span><del>-    void setExposedRect(FloatRect);
-    FloatRect exposedRect() const { return m_exposedRect; }
-
</del><span class="cx"> protected:
</span><span class="cx">     virtual bool scrollContentsFastPath(const IntSize&amp; scrollDelta, const IntRect&amp; rectToScroll, const IntRect&amp; clipRect) OVERRIDE;
</span><span class="cx">     virtual void scrollContentsSlowPath(const IntRect&amp; updateRect) OVERRIDE;
</span><span class="lines">@@ -633,8 +630,6 @@
</span><span class="cx"> 
</span><span class="cx">     bool m_shouldUpdateWhileOffscreen;
</span><span class="cx"> 
</span><del>-    FloatRect m_exposedRect;
-
</del><span class="cx">     unsigned m_deferSetNeedsLayouts;
</span><span class="cx">     bool m_setNeedsLayoutWasDeferred;
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicsGraphicsLayerClienth"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/GraphicsLayerClient.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/GraphicsLayerClient.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/platform/graphics/GraphicsLayerClient.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -28,8 +28,6 @@
</span><span class="cx"> 
</span><span class="cx"> #if USE(ACCELERATED_COMPOSITING)
</span><span class="cx"> 
</span><del>-#include &quot;FloatRect.h&quot;
-
</del><span class="cx"> namespace WebCore {
</span><span class="cx"> 
</span><span class="cx"> class FloatPoint;
</span><span class="lines">@@ -97,8 +95,6 @@
</span><span class="cx">     virtual bool shouldSkipLayerInDump(const GraphicsLayer*) const { return false; }
</span><span class="cx">     virtual bool shouldDumpPropertyForLayer(const GraphicsLayer*, const char*) const { return true; }
</span><span class="cx"> 
</span><del>-    virtual FloatRect exposedRect() const { return FloatRect::infiniteRect(); }
-
</del><span class="cx"> #ifndef NDEBUG
</span><span class="cx">     // RenderLayerBacking overrides this to verify that it is not
</span><span class="cx">     // currently painting contents. An ASSERT fails, if it is.
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicsTiledBackingh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/TiledBacking.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/TiledBacking.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/platform/graphics/TiledBacking.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -47,7 +47,9 @@
</span><span class="cx">     virtual FloatRect visibleRect() const = 0;
</span><span class="cx">     virtual bool tilesWouldChangeForVisibleRect(const FloatRect&amp;) const = 0;
</span><span class="cx"> 
</span><del>-    virtual void exposedRectDidChange() = 0;
</del><ins>+    virtual void setExposedRect(const FloatRect&amp;) = 0;
+    virtual void setClipsToExposedRect(bool) = 0;
+    virtual bool clipsToExposedRect() = 0;
</ins><span class="cx"> 
</span><span class="cx">     virtual void prepopulateRect(const FloatRect&amp;) = 0;
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicscaGraphicsLayerCAh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/ca/GraphicsLayerCA.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/ca/GraphicsLayerCA.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/platform/graphics/ca/GraphicsLayerCA.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -184,7 +184,7 @@
</span><span class="cx">     virtual void platformCALayerSetNeedsToRevalidateTiles() OVERRIDE;
</span><span class="cx">     virtual float platformCALayerDeviceScaleFactor() const OVERRIDE;
</span><span class="cx">     virtual float platformCALayerContentsScaleMultiplierForNewTiles(PlatformCALayer*) const OVERRIDE;
</span><del>-    virtual FloatRect platformCALayerExposedRect() const OVERRIDE { return m_client-&gt;exposedRect(); }
</del><ins>+
</ins><span class="cx">     virtual bool isCommittingChanges() const OVERRIDE { return m_isCommittingChanges; }
</span><span class="cx"> 
</span><span class="cx">     virtual double backingStoreMemoryEstimate() const;
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicscaPlatformCALayerClienth"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/ca/PlatformCALayerClient.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/ca/PlatformCALayerClient.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/platform/graphics/ca/PlatformCALayerClient.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -63,8 +63,6 @@
</span><span class="cx">     virtual float platformCALayerDeviceScaleFactor() const = 0;
</span><span class="cx">     virtual float platformCALayerContentsScaleMultiplierForNewTiles(PlatformCALayer*) const { return 1; }
</span><span class="cx"> 
</span><del>-    virtual FloatRect platformCALayerExposedRect() const = 0;
-
</del><span class="cx">     virtual bool isCommittingChanges() const { return false; }
</span><span class="cx"> 
</span><span class="cx"> protected:
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicscamacTileControllerh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/ca/mac/TileController.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/ca/mac/TileController.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/platform/graphics/ca/mac/TileController.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -102,7 +102,9 @@
</span><span class="cx">     // TiledBacking member functions.
</span><span class="cx">     virtual void setVisibleRect(const FloatRect&amp;) OVERRIDE;
</span><span class="cx">     virtual bool tilesWouldChangeForVisibleRect(const FloatRect&amp;) const OVERRIDE;
</span><del>-    virtual void exposedRectDidChange() OVERRIDE;
</del><ins>+    virtual void setExposedRect(const FloatRect&amp;) OVERRIDE;
+    virtual bool clipsToExposedRect() OVERRIDE { return m_clipsToExposedRect; }
+    virtual void setClipsToExposedRect(bool) OVERRIDE;
</ins><span class="cx">     virtual void prepopulateRect(const FloatRect&amp;) OVERRIDE;
</span><span class="cx">     virtual void setIsInWindow(bool) OVERRIDE;
</span><span class="cx">     virtual void setTileCoverage(TileCoverage) OVERRIDE;
</span><span class="lines">@@ -144,7 +146,6 @@
</span><span class="cx"> 
</span><span class="cx">     virtual void platformCALayerSetNeedsToRevalidateTiles() OVERRIDE { }
</span><span class="cx">     virtual float platformCALayerDeviceScaleFactor() const OVERRIDE;
</span><del>-    virtual FloatRect platformCALayerExposedRect() const OVERRIDE;
</del><span class="cx"> 
</span><span class="cx">     IntRect bounds() const;
</span><span class="cx">     IntRect boundsWithoutMargin() const;
</span><span class="lines">@@ -199,6 +200,7 @@
</span><span class="cx">     IntSize m_tileSize;
</span><span class="cx">     FloatRect m_visibleRect;
</span><span class="cx">     FloatRect m_visibleRectAtLastRevalidate;
</span><ins>+    FloatRect m_exposedRect; // The exposed area of containing platform views.
</ins><span class="cx">     IntRect m_boundsAtLastRevalidate;
</span><span class="cx">     
</span><span class="cx">     Vector&lt;FloatRect&gt; m_secondaryTileCoverageRects;
</span><span class="lines">@@ -243,6 +245,7 @@
</span><span class="cx">     bool m_unparentsOffscreenTiles;
</span><span class="cx">     bool m_acceleratesDrawing;
</span><span class="cx">     bool m_tilesAreOpaque;
</span><ins>+    bool m_clipsToExposedRect;
</ins><span class="cx">     bool m_hasTilesWithTemporaryScaleFactor; // Used to make low-res tiles when zooming.
</span><span class="cx"> 
</span><span class="cx">     Color m_tileDebugBorderColor;
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicscamacTileControllermm"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/ca/mac/TileController.mm (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/ca/mac/TileController.mm        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/platform/graphics/ca/mac/TileController.mm        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -67,6 +67,7 @@
</span><span class="cx">     , m_unparentsOffscreenTiles(false)
</span><span class="cx">     , m_acceleratesDrawing(false)
</span><span class="cx">     , m_tilesAreOpaque(false)
</span><ins>+    , m_clipsToExposedRect(false)
</ins><span class="cx">     , m_hasTilesWithTemporaryScaleFactor(false)
</span><span class="cx">     , m_tileDebugBorderWidth(0)
</span><span class="cx">     , m_indicatorMode(AsyncScrollingIndication)
</span><span class="lines">@@ -209,11 +210,6 @@
</span><span class="cx">     return owningGraphicsLayer()-&gt;platformCALayerShowRepaintCounter(0);
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-FloatRect TileController::platformCALayerExposedRect() const
-{
-    return owningGraphicsLayer()-&gt;platformCALayerExposedRect();
-}
-
</del><span class="cx"> void TileController::setScale(float scale)
</span><span class="cx"> {
</span><span class="cx">     ASSERT(owningGraphicsLayer()-&gt;isCommittingChanges());
</span><span class="lines">@@ -281,8 +277,10 @@
</span><span class="cx"> bool TileController::tilesWouldChangeForVisibleRect(const FloatRect&amp; newVisibleRect) const
</span><span class="cx"> {
</span><span class="cx">     FloatRect visibleRect = newVisibleRect;
</span><del>-    visibleRect.intersect(owningGraphicsLayer()-&gt;platformCALayerExposedRect());
</del><span class="cx"> 
</span><ins>+    if (m_clipsToExposedRect)
+        visibleRect.intersect(m_exposedRect);
+
</ins><span class="cx">     if (visibleRect.isEmpty() || bounds().isEmpty())
</span><span class="cx">         return false;
</span><span class="cx">         
</span><span class="lines">@@ -305,11 +303,27 @@
</span><span class="cx">     return coverageRect != m_primaryTileCoverageRect;
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-void TileController::exposedRectDidChange()
</del><ins>+void TileController::setExposedRect(const FloatRect&amp; exposedRect)
</ins><span class="cx"> {
</span><ins>+    if (m_exposedRect == exposedRect)
+        return;
+
+    m_exposedRect = exposedRect;
</ins><span class="cx">     setNeedsRevalidateTiles();
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+void TileController::setClipsToExposedRect(bool clipsToExposedRect)
+{
+    if (m_clipsToExposedRect == clipsToExposedRect)
+        return;
+
+    m_clipsToExposedRect = clipsToExposedRect;
+
+    // Going from not clipping to clipping, we don't need to revalidate right away.
+    if (clipsToExposedRect)
+        setNeedsRevalidateTiles();
+}
+
</ins><span class="cx"> void TileController::prepopulateRect(const FloatRect&amp; rect)
</span><span class="cx"> {
</span><span class="cx">     FloatRect scaledRect(rect);
</span><span class="lines">@@ -473,8 +487,10 @@
</span><span class="cx"> FloatRect TileController::computeTileCoverageRect(const FloatRect&amp; previousVisibleRect, const FloatRect&amp; currentVisibleRect) const
</span><span class="cx"> {
</span><span class="cx">     FloatRect visibleRect = currentVisibleRect;
</span><del>-    visibleRect.intersect(owningGraphicsLayer()-&gt;platformCALayerExposedRect());
</del><span class="cx"> 
</span><ins>+    if (m_clipsToExposedRect)
+        visibleRect.intersect(m_exposedRect);
+
</ins><span class="cx">     // If the page is not in a window (for example if it's in a background tab), we limit the tile coverage rect to the visible rect.
</span><span class="cx">     if (!m_isInWindow)
</span><span class="cx">         return visibleRect;
</span><span class="lines">@@ -672,7 +688,8 @@
</span><span class="cx">     FloatRect visibleRect = m_visibleRect;
</span><span class="cx">     IntRect bounds = this-&gt;bounds();
</span><span class="cx"> 
</span><del>-    visibleRect.intersect(owningGraphicsLayer()-&gt;platformCALayerExposedRect());
</del><ins>+    if (m_clipsToExposedRect)
+        visibleRect.intersect(m_exposedRect);
</ins><span class="cx"> 
</span><span class="cx">     if (visibleRect.isEmpty() || bounds.isEmpty())
</span><span class="cx">         return;
</span><span class="lines">@@ -915,7 +932,9 @@
</span><span class="cx">     FloatRect containerBounds = bounds();
</span><span class="cx">     FloatRect visibleRect = this-&gt;visibleRect();
</span><span class="cx"> 
</span><del>-    visibleRect.intersect(owningGraphicsLayer()-&gt;platformCALayerExposedRect());
</del><ins>+    if (m_clipsToExposedRect)
+        visibleRect.intersect(m_exposedRect);
+
</ins><span class="cx">     visibleRect.contract(4, 4); // Layer is positioned 2px from top and left edges.
</span><span class="cx"> 
</span><span class="cx">     float widthScale = 1;
</span><span class="lines">@@ -929,8 +948,8 @@
</span><span class="cx">     FloatRect mapBounds = containerBounds;
</span><span class="cx">     mapBounds.scale(indicatorScale, indicatorScale);
</span><span class="cx"> 
</span><del>-    if (!owningGraphicsLayer()-&gt;platformCALayerExposedRect().isInfinite())
-        m_tiledScrollingIndicatorLayer-&gt;setPosition(owningGraphicsLayer()-&gt;platformCALayerExposedRect().location() + FloatPoint(2, 2));
</del><ins>+    if (m_clipsToExposedRect)
+        m_tiledScrollingIndicatorLayer-&gt;setPosition(m_exposedRect.location() + FloatPoint(2, 2));
</ins><span class="cx">     else
</span><span class="cx">         m_tiledScrollingIndicatorLayer-&gt;setPosition(FloatPoint(2, 2));
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayerBackingcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayerBacking.cpp (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayerBacking.cpp        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/rendering/RenderLayerBacking.cpp        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -228,7 +228,7 @@
</span><span class="cx">             backing-&gt;setDidSwitchToFullTileCoverageDuringLoading();
</span><span class="cx">     }
</span><span class="cx">     if (!(useMinimalTilesDuringLoading || useMinimalTilesDuringLiveResize)) {
</span><del>-        bool clipsToExposedRect = !frameView.exposedRect().isInfinite();
</del><ins>+        bool clipsToExposedRect = backing-&gt;tiledBacking()-&gt;clipsToExposedRect();
</ins><span class="cx">         if (frameView.horizontalScrollbarMode() != ScrollbarAlwaysOff || clipsToExposedRect)
</span><span class="cx">             tileCoverage |= TiledBacking::CoverageForHorizontalScrolling;
</span><span class="cx"> 
</span><span class="lines">@@ -2598,15 +2598,6 @@
</span><span class="cx">     return backingMemory;
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-FloatRect RenderLayerBacking::exposedRect() const
-{
-    // FIXME: We should support clipping to the exposed rect for subframes as well.
-    if (m_isMainFrameRenderViewLayer)
-        return owningLayer().renderer().view().frameView().exposedRect();
-
-    return FloatRect::infiniteRect();
-}
-
</del><span class="cx"> } // namespace WebCore
</span><span class="cx"> 
</span><span class="cx"> #endif // USE(ACCELERATED_COMPOSITING)
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayerBackingh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayerBacking.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayerBacking.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebCore/rendering/RenderLayerBacking.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -180,8 +180,6 @@
</span><span class="cx">     virtual bool shouldSkipLayerInDump(const GraphicsLayer*) const OVERRIDE;
</span><span class="cx">     virtual bool shouldDumpPropertyForLayer(const GraphicsLayer*, const char* propertyName) const OVERRIDE;
</span><span class="cx"> 
</span><del>-    virtual FloatRect exposedRect() const OVERRIDE;
-
</del><span class="cx"> #ifndef NDEBUG
</span><span class="cx">     virtual void verifyNotPainting();
</span><span class="cx"> #endif
</span></span></pre></div>
<a id="trunkSourceWebKit2ChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/ChangeLog (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/ChangeLog        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/ChangeLog        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -1,3 +1,50 @@
</span><ins>+2014-01-07  Commit Queue  &lt;commit-queue@webkit.org&gt;
+
+        Unreviewed, rolling out r161447.
+        http://trac.webkit.org/changeset/161447
+        https://bugs.webkit.org/show_bug.cgi?id=126592
+
+        needs some more work (Requested by thorton on #webkit).
+
+        * UIProcess/API/mac/WKView.mm:
+        (-[WKView _updateViewExposedRect]):
+        * UIProcess/DrawingAreaProxy.cpp:
+        (WebKit::DrawingAreaProxy::DrawingAreaProxy):
+        * UIProcess/DrawingAreaProxy.h:
+        * UIProcess/WebPageProxy.cpp:
+        (WebKit::WebPageProxy::WebPageProxy):
+        (WebKit::WebPageProxy::close):
+        (WebKit::WebPageProxy::viewExposedRectChanged):
+        (WebKit::WebPageProxy::exposedRectChangedTimerFired):
+        * UIProcess/WebPageProxy.h:
+        (WebKit::WebPageProxy::viewExposedRect):
+        * WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
+        (WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage):
+        * WebProcess/WebPage/DrawingArea.h:
+        (WebKit::DrawingArea::setExposedRect):
+        (WebKit::DrawingArea::setClipsToExposedRect):
+        * WebProcess/WebPage/DrawingArea.messages.in:
+        * WebProcess/WebPage/WebPage.cpp:
+        (WebKit::WebPage::viewExposedRectChanged):
+        * WebProcess/WebPage/WebPage.h:
+        * WebProcess/WebPage/WebPage.messages.in:
+        * WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.h:
+        * WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm:
+        (WebKit::RemoteLayerTreeDrawingArea::RemoteLayerTreeDrawingArea):
+        (WebKit::RemoteLayerTreeDrawingArea::setClipsToExposedRect):
+        (WebKit::RemoteLayerTreeDrawingArea::updateScrolledExposedRect):
+        (WebKit::RemoteLayerTreeDrawingArea::updateMainFrameClipsToExposedRect):
+        * WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h:
+        * WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm:
+        (WebKit::TiledCoreAnimationDrawingArea::TiledCoreAnimationDrawingArea):
+        (WebKit::TiledCoreAnimationDrawingArea::flushLayers):
+        (WebKit::TiledCoreAnimationDrawingArea::setClipsToExposedRect):
+        (WebKit::TiledCoreAnimationDrawingArea::updateScrolledExposedRect):
+        (WebKit::TiledCoreAnimationDrawingArea::updateMainFrameClipsToExposedRect):
+        (WebKit::TiledCoreAnimationDrawingArea::setRootCompositingLayer):
+        (WebKit::TiledCoreAnimationDrawingArea::createPageOverlayLayer):
+        (WebKit::TiledCoreAnimationDrawingArea::didCommitChangesForLayer):
+
</ins><span class="cx"> 2014-01-07  Tim Horton  &lt;timothy_horton@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         TileController can fail to receive exposedRect from the drawing area if set at the wrong time
</span></span></pre></div>
<a id="trunkSourceWebKit2UIProcessAPImacWKViewmm"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/UIProcess/API/mac/WKView.mm (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/UIProcess/API/mac/WKView.mm        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/UIProcess/API/mac/WKView.mm        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -390,7 +390,7 @@
</span><span class="cx">     if (_data-&gt;_useContentPreparationRectForVisibleRect)
</span><span class="cx">         exposedRect = NSUnionRect(_data-&gt;_contentPreparationRect, exposedRect);
</span><span class="cx"> 
</span><del>-    _data-&gt;_page-&gt;drawingArea()-&gt;setExposedRect(_data-&gt;_clipsToVisibleRect ? FloatRect(exposedRect) : FloatRect::infiniteRect());
</del><ins>+    _data-&gt;_page-&gt;viewExposedRectChanged(exposedRect, _data-&gt;_clipsToVisibleRect ? WebPageProxy::ClipsToExposedRect::Clip : WebPageProxy::ClipsToExposedRect::DoNotClip);
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> - (void)setFrameSize:(NSSize)size
</span></span></pre></div>
<a id="trunkSourceWebKit2UIProcessDrawingAreaProxycpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/UIProcess/DrawingAreaProxy.cpp (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/UIProcess/DrawingAreaProxy.cpp        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/UIProcess/DrawingAreaProxy.cpp        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -26,7 +26,6 @@
</span><span class="cx"> #include &quot;config.h&quot;
</span><span class="cx"> #include &quot;DrawingAreaProxy.h&quot;
</span><span class="cx"> 
</span><del>-#include &quot;DrawingAreaMessages.h&quot;
</del><span class="cx"> #include &quot;DrawingAreaProxyMessages.h&quot;
</span><span class="cx"> #include &quot;WebPageProxy.h&quot;
</span><span class="cx"> #include &quot;WebProcessProxy.h&quot;
</span><span class="lines">@@ -39,9 +38,6 @@
</span><span class="cx">     : m_type(type)
</span><span class="cx">     , m_webPageProxy(webPageProxy)
</span><span class="cx">     , m_size(webPageProxy-&gt;viewSize())
</span><del>-#if PLATFORM(MAC)
-    , m_exposedRectChangedTimer(this, &amp;DrawingAreaProxy::exposedRectChangedTimerFired)
-#endif
</del><span class="cx"> {
</span><span class="cx">     m_webPageProxy-&gt;process().addMessageReceiver(Messages::DrawingAreaProxy::messageReceiverName(), webPageProxy-&gt;pageID(), *this);
</span><span class="cx"> }
</span><span class="lines">@@ -62,29 +58,4 @@
</span><span class="cx">     sizeDidChange();
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-#if PLATFORM(MAC)
-void DrawingAreaProxy::setExposedRect(const FloatRect&amp; exposedRect)
-{
-    if (!m_webPageProxy-&gt;isValid())
-        return;
-
-    m_exposedRect = exposedRect;
-
-    if (!m_exposedRectChangedTimer.isActive())
-        m_exposedRectChangedTimer.startOneShot(0);
-}
-
-void DrawingAreaProxy::exposedRectChangedTimerFired(Timer&lt;DrawingAreaProxy&gt;*)
-{
-    if (!m_webPageProxy-&gt;isValid())
-        return;
-
-    if (m_exposedRect == m_lastSentExposedRect)
-        return;
-
-    m_webPageProxy-&gt;process().send(Messages::DrawingArea::SetExposedRect(m_exposedRect), m_webPageProxy-&gt;pageID());
-    m_lastSentExposedRect = m_exposedRect;
-}
-#endif
-
</del><span class="cx"> } // namespace WebKit
</span></span></pre></div>
<a id="trunkSourceWebKit2UIProcessDrawingAreaProxyh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/UIProcess/DrawingAreaProxy.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/UIProcess/DrawingAreaProxy.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/UIProcess/DrawingAreaProxy.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -29,10 +29,9 @@
</span><span class="cx"> 
</span><span class="cx"> #include &quot;DrawingAreaInfo.h&quot;
</span><span class="cx"> #include &quot;MessageReceiver.h&quot;
</span><del>-#include &lt;WebCore/FloatRect.h&gt;
</del><ins>+#include &lt;WebCore/FloatPoint.h&gt;
</ins><span class="cx"> #include &lt;WebCore/IntRect.h&gt;
</span><span class="cx"> #include &lt;WebCore/IntSize.h&gt;
</span><del>-#include &lt;WebCore/Timer.h&gt;
</del><span class="cx"> #include &lt;chrono&gt;
</span><span class="cx"> #include &lt;stdint.h&gt;
</span><span class="cx"> #include &lt;wtf/Noncopyable.h&gt;
</span><span class="lines">@@ -73,12 +72,6 @@
</span><span class="cx">     virtual void adjustTransientZoom(double, WebCore::FloatPoint) { }
</span><span class="cx">     virtual void commitTransientZoom(double, WebCore::FloatPoint) { }
</span><span class="cx"> 
</span><del>-#if PLATFORM(MAC)
-    void setExposedRect(const WebCore::FloatRect&amp;);
-    WebCore::FloatRect exposedRect() const { return m_exposedRect; }
-    void exposedRectChangedTimerFired(WebCore::Timer&lt;DrawingAreaProxy&gt;*);
-#endif
-
</del><span class="cx"> protected:
</span><span class="cx">     explicit DrawingAreaProxy(DrawingAreaType, WebPageProxy*);
</span><span class="cx"> 
</span><span class="lines">@@ -107,10 +100,6 @@
</span><span class="cx"> #if PLATFORM(MAC)
</span><span class="cx">     virtual void didUpdateGeometry() { }
</span><span class="cx">     virtual void intrinsicContentSizeDidChange(const WebCore::IntSize&amp; newIntrinsicContentSize) { }
</span><del>-
-    WebCore::Timer&lt;DrawingAreaProxy&gt; m_exposedRectChangedTimer;
-    WebCore::FloatRect m_exposedRect;
-    WebCore::FloatRect m_lastSentExposedRect;
</del><span class="cx"> #endif
</span><span class="cx"> };
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebKit2UIProcessWebPageProxycpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/UIProcess/WebPageProxy.cpp (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/UIProcess/WebPageProxy.cpp        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/UIProcess/WebPageProxy.cpp        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -308,6 +308,11 @@
</span><span class="cx">     , m_mediaVolume(1)
</span><span class="cx">     , m_mayStartMediaWhenInWindow(true)
</span><span class="cx">     , m_waitingForDidUpdateViewState(false)
</span><ins>+#if PLATFORM(MAC)
+    , m_exposedRectChangedTimer(this, &amp;WebPageProxy::exposedRectChangedTimerFired)
+    , m_clipsToExposedRect(ClipsToExposedRect::DoNotClip)
+    , m_lastSentClipsToExposedRect(ClipsToExposedRect::DoNotClip)
+#endif
</ins><span class="cx">     , m_scrollPinningBehavior(DoNotPin)
</span><span class="cx"> {
</span><span class="cx">     updateViewState();
</span><span class="lines">@@ -557,6 +562,10 @@
</span><span class="cx">     m_contextMenuClient.initialize(0);
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+#if PLATFORM(MAC) &amp;&amp; !PLATFORM(IOS)
+    m_exposedRectChangedTimer.stop();
+#endif
+
</ins><span class="cx">     m_process-&gt;send(Messages::WebPage::Close(), m_pageID);
</span><span class="cx">     m_process-&gt;removeWebPage(m_pageID);
</span><span class="cx">     m_process-&gt;removeMessageReceiver(Messages::WebPageProxy::messageReceiverName(), m_pageID);
</span><span class="lines">@@ -4411,4 +4420,31 @@
</span><span class="cx">         m_process-&gt;send(Messages::WebPage::SetScrollPinningBehavior(pinning), m_pageID);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+#if PLATFORM(MAC) || PLATFORM(IOS)
+void WebPageProxy::viewExposedRectChanged(const FloatRect&amp; exposedRect, ClipsToExposedRect clipsToExposedRect)
+{
+    if (!isValid())
+        return;
+
+    m_exposedRect = exposedRect;
+    m_clipsToExposedRect = clipsToExposedRect;
+
+    if (!m_exposedRectChangedTimer.isActive())
+        m_exposedRectChangedTimer.startOneShot(0);
+}
+
+void WebPageProxy::exposedRectChangedTimerFired(Timer&lt;WebPageProxy&gt;*)
+{
+    if (!isValid())
+        return;
+
+    if (m_exposedRect == m_lastSentExposedRect &amp;&amp; m_clipsToExposedRect == m_lastSentClipsToExposedRect)
+        return;
+
+    process().send(Messages::WebPage::ViewExposedRectChanged(m_exposedRect, m_clipsToExposedRect == ClipsToExposedRect::Clip), m_pageID);
+    m_lastSentExposedRect = m_exposedRect;
+    m_lastSentClipsToExposedRect = m_clipsToExposedRect;
+}
+#endif
+
</ins><span class="cx"> } // namespace WebKit
</span></span></pre></div>
<a id="trunkSourceWebKit2UIProcessWebPageProxyh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/UIProcess/WebPageProxy.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/UIProcess/WebPageProxy.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/UIProcess/WebPageProxy.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -472,6 +472,10 @@
</span><span class="cx"> 
</span><span class="cx"> #if PLATFORM(MAC)
</span><span class="cx">     void windowAndViewFramesChanged(const WebCore::FloatRect&amp; viewFrameInWindowCoordinates, const WebCore::FloatPoint&amp; accessibilityViewCoordinates);
</span><ins>+    enum class ClipsToExposedRect { DoNotClip, Clip };
+    void viewExposedRectChanged(const WebCore::FloatRect&amp; exposedRect, ClipsToExposedRect);
+    WebCore::FloatRect viewExposedRect() const { return m_exposedRect; }
+    void exposedRectChangedTimerFired(WebCore::Timer&lt;WebPageProxy&gt;*);
</ins><span class="cx">     void setMainFrameIsScrollable(bool);
</span><span class="cx"> 
</span><span class="cx">     void setComposition(const String&amp; text, Vector&lt;WebCore::CompositionUnderline&gt; underlines, uint64_t selectionStart, uint64_t selectionEnd, uint64_t replacementRangeStart, uint64_t replacementRangeEnd);
</span><span class="lines">@@ -1370,6 +1374,14 @@
</span><span class="cx">     bool m_waitingForDidUpdateViewState;
</span><span class="cx"> 
</span><span class="cx"> #if PLATFORM(MAC)
</span><ins>+    WebCore::Timer&lt;WebPageProxy&gt; m_exposedRectChangedTimer;
+    WebCore::FloatRect m_exposedRect;
+    WebCore::FloatRect m_lastSentExposedRect;
+    ClipsToExposedRect m_clipsToExposedRect;
+    ClipsToExposedRect m_lastSentClipsToExposedRect;
+#endif
+
+#if PLATFORM(MAC)
</ins><span class="cx">     HashMap&lt;String, String&gt; m_temporaryPDFFiles;
</span><span class="cx"> #endif
</span><span class="cx">         
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebCoreSupportWebFrameLoaderClientcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -1238,7 +1238,6 @@
</span><span class="cx"> 
</span><span class="cx">     m_frame-&gt;coreFrame()-&gt;view()-&gt;setProhibitsScrolling(shouldDisableScrolling);
</span><span class="cx">     m_frame-&gt;coreFrame()-&gt;view()-&gt;setVisualUpdatesAllowedByClient(!webPage-&gt;shouldExtendIncrementalRenderingSuppression());
</span><del>-    m_frame-&gt;coreFrame()-&gt;view()-&gt;setExposedRect(webPage-&gt;drawingArea()-&gt;exposedRect());
</del><span class="cx"> #if PLATFORM(IOS)
</span><span class="cx">     m_frame-&gt;coreFrame()-&gt;view()-&gt;setDelegatesScrolling(true);
</span><span class="cx"> #endif
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPageDrawingAreah"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/DrawingArea.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/DrawingArea.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/DrawingArea.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -28,7 +28,7 @@
</span><span class="cx"> 
</span><span class="cx"> #include &quot;DrawingAreaInfo.h&quot;
</span><span class="cx"> #include &quot;LayerTreeContext.h&quot;
</span><del>-#include &lt;WebCore/FloatRect.h&gt;
</del><ins>+#include &lt;WebCore/FloatPoint.h&gt;
</ins><span class="cx"> #include &lt;WebCore/IntRect.h&gt;
</span><span class="cx"> #include &lt;WebCore/ViewState.h&gt;
</span><span class="cx"> #include &lt;wtf/Forward.h&gt;
</span><span class="lines">@@ -86,8 +86,8 @@
</span><span class="cx">     virtual void updatePreferences(const WebPreferencesStore&amp;) { }
</span><span class="cx">     virtual void mainFrameContentSizeChanged(const WebCore::IntSize&amp;) { }
</span><span class="cx"> 
</span><del>-    virtual void setExposedRect(const WebCore::FloatRect&amp;) = 0;
-    virtual WebCore::FloatRect exposedRect() const = 0;
</del><ins>+    virtual void setExposedRect(const WebCore::FloatRect&amp;) { }
+    virtual void setClipsToExposedRect(bool) { }
</ins><span class="cx">     virtual void mainFrameScrollabilityChanged(bool) { }
</span><span class="cx"> 
</span><span class="cx">     virtual bool supportsAsyncScrolling() { return false; }
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPageDrawingAreamessagesin"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/DrawingArea.messages.in (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/DrawingArea.messages.in        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/DrawingArea.messages.in        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -29,8 +29,7 @@
</span><span class="cx">     UpdateGeometry(WebCore::IntSize viewSize, WebCore::IntSize layerPosition)
</span><span class="cx">     SetDeviceScaleFactor(float deviceScaleFactor)
</span><span class="cx">     SetColorSpace(WebKit::ColorSpaceData colorSpace)
</span><del>-    SetExposedRect(WebCore::FloatRect exposedRect)
-
</del><ins>+    
</ins><span class="cx">     AdjustTransientZoom(double scale, WebCore::FloatPoint origin)
</span><span class="cx">     CommitTransientZoom(double scale, WebCore::FloatPoint origin)
</span><span class="cx"> #endif
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPageWebPagecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/WebPage.cpp (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/WebPage.cpp        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/WebPage.cpp        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -3075,6 +3075,12 @@
</span><span class="cx"> }
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+void WebPage::viewExposedRectChanged(const FloatRect&amp; exposedRect, bool clipsToExposedRect)
+{
+    m_drawingArea-&gt;setExposedRect(exposedRect);
+    m_drawingArea-&gt;setClipsToExposedRect(clipsToExposedRect);
+}
+
</ins><span class="cx"> void WebPage::setMainFrameIsScrollable(bool isScrollable)
</span><span class="cx"> {
</span><span class="cx">     m_mainFrameIsScrollable = isScrollable;
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPageWebPageh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/WebPage.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/WebPage.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/WebPage.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -802,6 +802,7 @@
</span><span class="cx">     void drawPagesToPDFFromPDFDocument(CGContextRef, PDFDocument *, const PrintInfo&amp;, uint32_t first, uint32_t count);
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+    void viewExposedRectChanged(const WebCore::FloatRect&amp; exposedRect, bool clipsToExposedRect);
</ins><span class="cx">     void setMainFrameIsScrollable(bool);
</span><span class="cx"> 
</span><span class="cx">     void unapplyEditCommand(uint64_t commandID);
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPageWebPagemessagesin"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/WebPage.messages.in (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/WebPage.messages.in        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/WebPage.messages.in        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -268,6 +268,7 @@
</span><span class="cx">     SendComplexTextInputToPlugin(uint64_t pluginComplexTextInputIdentifier, String textInput)
</span><span class="cx"> 
</span><span class="cx">     WindowAndViewFramesChanged(WebCore::FloatRect windowFrameInScreenCoordinates, WebCore::FloatRect windowFrameInUnflippedScreenCoordinates, WebCore::FloatRect viewFrameInWindowCoordinates, WebCore::FloatPoint accessibilityViewCoordinates)
</span><ins>+    ViewExposedRectChanged(WebCore::FloatRect exposedRect, bool clipsToExposedRect)
</ins><span class="cx">     SetMainFrameIsScrollable(bool isScrollable)
</span><span class="cx">     RegisterUIProcessAccessibilityTokens(IPC::DataReference elemenToken, IPC::DataReference windowToken)
</span><span class="cx">     GetStringSelectionForPasteboard() -&gt; (String stringValue)
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPagemacRemoteLayerTreeDrawingAreah"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -72,7 +72,7 @@
</span><span class="cx">     virtual bool forceRepaintAsync(uint64_t) OVERRIDE { return false; }
</span><span class="cx"> 
</span><span class="cx">     virtual void setExposedRect(const WebCore::FloatRect&amp;) OVERRIDE;
</span><del>-    virtual WebCore::FloatRect exposedRect() const OVERRIDE { return m_scrolledExposedRect; }
</del><ins>+    virtual void setClipsToExposedRect(bool) OVERRIDE;
</ins><span class="cx"> 
</span><span class="cx">     // WebCore::GraphicsLayerClient
</span><span class="cx">     virtual void notifyAnimationStarted(const WebCore::GraphicsLayer*, double time) OVERRIDE { }
</span><span class="lines">@@ -85,6 +85,7 @@
</span><span class="cx">     virtual bool allowCompositingLayerVisualDegradation() const OVERRIDE { return false; }
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+    void updateMainFrameClipsToExposedRect();
</ins><span class="cx">     void updateScrolledExposedRect();
</span><span class="cx"> 
</span><span class="cx">     void layerFlushTimerFired(WebCore::Timer&lt;RemoteLayerTreeDrawingArea&gt;*);
</span><span class="lines">@@ -101,6 +102,7 @@
</span><span class="cx"> 
</span><span class="cx">     WebCore::FloatRect m_exposedRect;
</span><span class="cx">     WebCore::FloatRect m_scrolledExposedRect;
</span><ins>+    bool m_clipsToExposedRect;
</ins><span class="cx"> 
</span><span class="cx">     WebCore::Timer&lt;RemoteLayerTreeDrawingArea&gt; m_layerFlushTimer;
</span><span class="cx">     bool m_isFlushingSuspended;
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPagemacRemoteLayerTreeDrawingAreamm"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -46,8 +46,7 @@
</span><span class="cx"> RemoteLayerTreeDrawingArea::RemoteLayerTreeDrawingArea(WebPage* webPage, const WebPageCreationParameters&amp;)
</span><span class="cx">     : DrawingArea(DrawingAreaTypeRemoteLayerTree, webPage)
</span><span class="cx">     , m_remoteLayerTreeContext(std::make_unique&lt;RemoteLayerTreeContext&gt;(webPage))
</span><del>-    , m_exposedRect(FloatRect::infiniteRect())
-    , m_scrolledExposedRect(FloatRect::infiniteRect())
</del><ins>+    , m_clipsToExposedRect(false)
</ins><span class="cx">     , m_layerFlushTimer(this, &amp;RemoteLayerTreeDrawingArea::layerFlushTimerFired)
</span><span class="cx">     , m_isFlushingSuspended(false)
</span><span class="cx">     , m_hasDeferredFlush(false)
</span><span class="lines">@@ -55,6 +54,7 @@
</span><span class="cx">     webPage-&gt;corePage()-&gt;settings().setForceCompositingMode(true);
</span><span class="cx"> #if PLATFORM(IOS)
</span><span class="cx">     webPage-&gt;corePage()-&gt;settings().setDelegatesPageScaling(true);
</span><ins>+    setClipsToExposedRect(true);
</ins><span class="cx"> #endif
</span><span class="cx"> }
</span><span class="cx"> 
</span><span class="lines">@@ -234,8 +234,18 @@
</span><span class="cx">     updateScrolledExposedRect();
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+void RemoteLayerTreeDrawingArea::setClipsToExposedRect(bool clipsToExposedRect)
+{
+    m_clipsToExposedRect = clipsToExposedRect;
+    updateScrolledExposedRect();
+    updateMainFrameClipsToExposedRect();
+}
+
</ins><span class="cx"> void RemoteLayerTreeDrawingArea::updateScrolledExposedRect()
</span><span class="cx"> {
</span><ins>+    if (!m_clipsToExposedRect)
+        return;
+
</ins><span class="cx">     FrameView* frameView = m_webPage-&gt;corePage()-&gt;mainFrame().view();
</span><span class="cx">     if (!frameView)
</span><span class="cx">         return;
</span><span class="lines">@@ -243,18 +253,30 @@
</span><span class="cx">     m_scrolledExposedRect = m_exposedRect;
</span><span class="cx"> 
</span><span class="cx"> #if !PLATFORM(IOS)
</span><del>-    if (!m_exposedRect.isInfinite()) {
-        IntPoint scrollPositionWithOrigin = frameView-&gt;scrollPosition() + toIntSize(frameView-&gt;scrollOrigin());
-        m_scrolledExposedRect.moveBy(scrollPositionWithOrigin);
-    }
</del><ins>+    IntPoint scrollPositionWithOrigin = frameView-&gt;scrollPosition() + toIntSize(frameView-&gt;scrollOrigin());
+    m_scrolledExposedRect.moveBy(scrollPositionWithOrigin);
</ins><span class="cx"> #endif
</span><span class="cx"> 
</span><del>-    frameView-&gt;setExposedRect(m_scrolledExposedRect);
</del><ins>+    mainFrameTiledBacking()-&gt;setExposedRect(m_scrolledExposedRect);
</ins><span class="cx"> 
</span><del>-    for (const auto&amp; layer : m_pageOverlayLayers.values()) {
-        if (TiledBacking* tiledBacking = layer-&gt;tiledBacking())
-            tiledBacking-&gt;exposedRectDidChange();
</del><ins>+    for (auto it = m_pageOverlayLayers.begin(), end = m_pageOverlayLayers.end(); it != end; ++it) {
+        if (TiledBacking* tiledBacking = it-&gt;value-&gt;tiledBacking())
+            tiledBacking-&gt;setExposedRect(m_scrolledExposedRect);
</ins><span class="cx">     }
</span><ins>+}
+
+void RemoteLayerTreeDrawingArea::updateMainFrameClipsToExposedRect()
+{
+    if (TiledBacking* tiledBacking = mainFrameTiledBacking())
+        tiledBacking-&gt;setClipsToExposedRect(m_clipsToExposedRect);
+
+    for (auto it = m_pageOverlayLayers.begin(), end = m_pageOverlayLayers.end(); it != end; ++it)
+        if (TiledBacking* tiledBacking = it-&gt;value-&gt;tiledBacking())
+            tiledBacking-&gt;setClipsToExposedRect(m_clipsToExposedRect);
+
+    FrameView* frameView = m_webPage-&gt;corePage()-&gt;mainFrame().view();
+    if (!frameView)
+        return;
</ins><span class="cx">     
</span><span class="cx">     frameView-&gt;adjustTiledBackingCoverage();
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPagemacTiledCoreAnimationDrawingAreah"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -78,8 +78,7 @@
</span><span class="cx">     virtual void mainFrameContentSizeChanged(const WebCore::IntSize&amp;) OVERRIDE;
</span><span class="cx"> 
</span><span class="cx">     virtual void setExposedRect(const WebCore::FloatRect&amp;) OVERRIDE;
</span><del>-    virtual WebCore::FloatRect exposedRect() const OVERRIDE { return m_scrolledExposedRect; }
-
</del><ins>+    virtual void setClipsToExposedRect(bool) OVERRIDE;
</ins><span class="cx">     virtual bool supportsAsyncScrolling() OVERRIDE { return true; }
</span><span class="cx"> 
</span><span class="cx">     virtual void didChangeScrollOffsetForAnyFrame() OVERRIDE;
</span><span class="lines">@@ -120,6 +119,7 @@
</span><span class="cx">     void updateDebugInfoLayer(bool showLayer);
</span><span class="cx"> 
</span><span class="cx">     void updateIntrinsicContentSizeTimerFired(WebCore::Timer&lt;TiledCoreAnimationDrawingArea&gt;*);
</span><ins>+    void updateMainFrameClipsToExposedRect();
</ins><span class="cx">     void updateScrolledExposedRect();
</span><span class="cx">     
</span><span class="cx">     void invalidateAllPageOverlays();
</span><span class="lines">@@ -143,6 +143,7 @@
</span><span class="cx"> 
</span><span class="cx">     WebCore::FloatRect m_exposedRect;
</span><span class="cx">     WebCore::FloatRect m_scrolledExposedRect;
</span><ins>+    bool m_clipsToExposedRect;
</ins><span class="cx"> 
</span><span class="cx">     WebCore::IntSize m_lastSentIntrinsicContentSize;
</span><span class="cx">     WebCore::Timer&lt;TiledCoreAnimationDrawingArea&gt; m_updateIntrinsicContentSizeTimer;
</span></span></pre></div>
<a id="trunkSourceWebKit2WebProcessWebPagemacTiledCoreAnimationDrawingAreamm"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm (161451 => 161452)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm        2014-01-07 21:07:03 UTC (rev 161451)
+++ trunk/Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm        2014-01-07 21:27:10 UTC (rev 161452)
</span><span class="lines">@@ -71,8 +71,7 @@
</span><span class="cx">     , m_layerTreeStateIsFrozen(false)
</span><span class="cx">     , m_layerFlushScheduler(this)
</span><span class="cx">     , m_isPaintingSuspended(!(parameters.viewState &amp; ViewState::IsVisible))
</span><del>-    , m_exposedRect(FloatRect::infiniteRect())
-    , m_scrolledExposedRect(FloatRect::infiniteRect())
</del><ins>+    , m_clipsToExposedRect(false)
</ins><span class="cx">     , m_updateIntrinsicContentSizeTimer(this, &amp;TiledCoreAnimationDrawingArea::updateIntrinsicContentSizeTimerFired)
</span><span class="cx">     , m_transientZoomScale(1)
</span><span class="cx"> {
</span><span class="lines">@@ -375,8 +374,9 @@
</span><span class="cx">         m_pendingRootCompositingLayer = nullptr;
</span><span class="cx">     }
</span><span class="cx"> 
</span><del>-    FloatRect visibleRect = [m_rootLayer frame];
-    visibleRect.intersect(m_scrolledExposedRect);
</del><ins>+    IntRect visibleRect = enclosingIntRect(m_rootLayer.get().frame);
+    if (m_clipsToExposedRect)
+        visibleRect.intersect(enclosingIntRect(m_scrolledExposedRect));
</ins><span class="cx"> 
</span><span class="cx">     for (PageOverlayLayerMap::iterator it = m_pageOverlayLayers.begin(), end = m_pageOverlayLayers.end(); it != end; ++it) {
</span><span class="cx">         GraphicsLayer* layer = it-&gt;value.get();
</span><span class="lines">@@ -427,29 +427,33 @@
</span><span class="cx">     updateScrolledExposedRect();
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+void TiledCoreAnimationDrawingArea::setClipsToExposedRect(bool clipsToExposedRect)
+{
+    m_clipsToExposedRect = clipsToExposedRect;
+    updateScrolledExposedRect();
+    updateMainFrameClipsToExposedRect();
+}
+
</ins><span class="cx"> void TiledCoreAnimationDrawingArea::updateScrolledExposedRect()
</span><span class="cx"> {
</span><ins>+    if (!m_clipsToExposedRect)
+        return;
+
</ins><span class="cx">     FrameView* frameView = m_webPage-&gt;corePage()-&gt;mainFrame().view();
</span><span class="cx">     if (!frameView)
</span><span class="cx">         return;
</span><span class="cx"> 
</span><ins>+    IntPoint scrollPositionWithOrigin = frameView-&gt;scrollPosition() + toIntSize(frameView-&gt;scrollOrigin());
+
</ins><span class="cx">     m_scrolledExposedRect = m_exposedRect;
</span><ins>+    m_scrolledExposedRect.moveBy(scrollPositionWithOrigin);
</ins><span class="cx"> 
</span><del>-#if !PLATFORM(IOS)
-    if (!m_exposedRect.isInfinite()) {
-        IntPoint scrollPositionWithOrigin = frameView-&gt;scrollPosition() + toIntSize(frameView-&gt;scrollOrigin());
-        m_scrolledExposedRect.moveBy(scrollPositionWithOrigin);
-    }
-#endif
</del><ins>+    mainFrameTiledBacking()-&gt;setExposedRect(m_scrolledExposedRect);
</ins><span class="cx"> 
</span><del>-    frameView-&gt;setExposedRect(m_scrolledExposedRect);
-
-    for (const auto&amp; layer : m_pageOverlayLayers.values()) {
-        if (TiledBacking* tiledBacking = layer-&gt;tiledBacking())
-            tiledBacking-&gt;exposedRectDidChange();
</del><ins>+    for (PageOverlayLayerMap::iterator it = m_pageOverlayLayers.begin(), end = m_pageOverlayLayers.end(); it != end; ++it) {
+        if (TiledBacking* tiledBacking = it-&gt;value-&gt;tiledBacking())
+            tiledBacking-&gt;setExposedRect(m_scrolledExposedRect);
</ins><span class="cx">     }
</span><del>-
-    frameView-&gt;adjustTiledBackingCoverage();
</del><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void TiledCoreAnimationDrawingArea::updateGeometry(const IntSize&amp; viewSize, const IntSize&amp; layerPosition)
</span><span class="lines">@@ -556,6 +560,22 @@
</span><span class="cx">         m_layerHostingContext-&gt;setColorSpace(colorSpace.get());
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+void TiledCoreAnimationDrawingArea::updateMainFrameClipsToExposedRect()
+{
+    if (TiledBacking* tiledBacking = mainFrameTiledBacking())
+        tiledBacking-&gt;setClipsToExposedRect(m_clipsToExposedRect);
+
+    for (PageOverlayLayerMap::iterator it = m_pageOverlayLayers.begin(), end = m_pageOverlayLayers.end(); it != end; ++it)
+        if (TiledBacking* tiledBacking = it-&gt;value-&gt;tiledBacking())
+            tiledBacking-&gt;setClipsToExposedRect(m_clipsToExposedRect);
+
+    FrameView* frameView = m_webPage-&gt;corePage()-&gt;mainFrame().view();
+    if (!frameView)
+        return;
+
+    frameView-&gt;adjustTiledBackingCoverage();
+}
+
</ins><span class="cx"> void TiledCoreAnimationDrawingArea::setRootCompositingLayer(CALayer *layer)
</span><span class="cx"> {
</span><span class="cx">     ASSERT(!m_layerTreeStateIsFrozen);
</span><span class="lines">@@ -574,9 +594,13 @@
</span><span class="cx">     for (PageOverlayLayerMap::iterator it = m_pageOverlayLayers.begin(), end = m_pageOverlayLayers.end(); it != end; ++it)
</span><span class="cx">         [m_rootLayer.get() addSublayer:it-&gt;value-&gt;platformLayer()];
</span><span class="cx"> 
</span><del>-    if (TiledBacking* tiledBacking = mainFrameTiledBacking())
</del><ins>+    if (TiledBacking* tiledBacking = mainFrameTiledBacking()) {
</ins><span class="cx">         tiledBacking-&gt;setAggressivelyRetainsTiles(m_webPage-&gt;corePage()-&gt;settings().aggressiveTileRetentionEnabled());
</span><ins>+        tiledBacking-&gt;setExposedRect(m_scrolledExposedRect);
+    }
</ins><span class="cx"> 
</span><ins>+    updateMainFrameClipsToExposedRect();
+
</ins><span class="cx">     updateDebugInfoLayer(m_webPage-&gt;corePage()-&gt;settings().showTiledScrollingIndicator());
</span><span class="cx"> 
</span><span class="cx">     [CATransaction commit];
</span><span class="lines">@@ -595,6 +619,11 @@
</span><span class="cx"> 
</span><span class="cx">     m_pageOverlayPlatformLayers.set(layer.get(), layer-&gt;platformLayer());
</span><span class="cx"> 
</span><ins>+    if (TiledBacking* tiledBacking = layer-&gt;tiledBacking()) {
+        tiledBacking-&gt;setExposedRect(m_scrolledExposedRect);
+        tiledBacking-&gt;setClipsToExposedRect(m_clipsToExposedRect);
+    }
+
</ins><span class="cx">     [CATransaction begin];
</span><span class="cx">     [CATransaction setDisableActions:YES];
</span><span class="cx"> 
</span><span class="lines">@@ -638,6 +667,11 @@
</span><span class="cx"> 
</span><span class="cx">     [CATransaction commit];
</span><span class="cx"> 
</span><ins>+    if (TiledBacking* tiledBacking = layer-&gt;tiledBacking()) {
+        tiledBacking-&gt;setExposedRect(m_scrolledExposedRect);
+        tiledBacking-&gt;setClipsToExposedRect(m_clipsToExposedRect);
+    }
+
</ins><span class="cx">     m_pageOverlayPlatformLayers.set(layer, layer-&gt;platformLayer());
</span><span class="cx"> }
</span><span class="cx"> 
</span></span></pre>
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