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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/215181">215181</a></dd>
<dt>Author</dt> <dd>akling@apple.com</dd>
<dt>Date</dt> <dd>2017-04-10 06:49:18 -0700 (Mon, 10 Apr 2017)</dd>
</dl>

<h3>Log Message</h3>
<pre>Don't generate extra scrolling tiles for non-visible pages.
https://bugs.webkit.org/show_bug.cgi?id=167213
&lt;rdar://problem/30105774&gt;

Reviewed by Antti Koivisto.

Source/WebCore:

Reduce the tiling coverage to a minimum when the page is non-visible.
On macOS, this means that fully occluded web views can maintain a smaller set of tiles
in non-volatile surfaces, reducing net footprint.

Test: compositing/tiling/non-visible-window-tile-coverage.html

* rendering/RenderLayerBacking.cpp:
(WebCore::computePageTiledBackingCoverage): If the page's activity state is non-visible, use minimal tile coverage.
* platform/ScrollView.h:
* page/FrameView.h:
* page/FrameView.cpp:
(WebCore::FrameView::hide): Call adjustTiledBackingCoverage() in hide() since it now takes page visibility into account.

(WebCore::FrameView::enableSpeculativeTilingIfNeeded):
* testing/Internals.cpp:
(WebCore::Internals::setSpeculativeTilingDelayDisabledForTesting):
* testing/Internals.h:
* testing/Internals.idl: Add an internals API for disabling the 500ms delay before speculative tiling begins after
the main frame load finishes. This is needed for reliably testing this change.

LayoutTests:

* TestExpectations:
* compositing/tiling/non-visible-window-tile-coverage-expected.txt: Added.
* compositing/tiling/non-visible-window-tile-coverage.html: Added.
* platform/mac-wk2/TestExpectations:</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkLayoutTestsTestExpectations">trunk/LayoutTests/TestExpectations</a></li>
<li><a href="#trunkLayoutTestsplatformmacwk2TestExpectations">trunk/LayoutTests/platform/mac-wk2/TestExpectations</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</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="#trunkSourceWebCoreplatformScrollViewh">trunk/Source/WebCore/platform/ScrollView.h</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayerBackingcpp">trunk/Source/WebCore/rendering/RenderLayerBacking.cpp</a></li>
<li><a href="#trunkSourceWebCoretestingInternalscpp">trunk/Source/WebCore/testing/Internals.cpp</a></li>
<li><a href="#trunkSourceWebCoretestingInternalsh">trunk/Source/WebCore/testing/Internals.h</a></li>
<li><a href="#trunkSourceWebCoretestingInternalsidl">trunk/Source/WebCore/testing/Internals.idl</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestscompositingtilingnonvisiblewindowtilecoverageexpectedtxt">trunk/LayoutTests/compositing/tiling/non-visible-window-tile-coverage-expected.txt</a></li>
<li><a href="#trunkLayoutTestscompositingtilingnonvisiblewindowtilecoveragehtml">trunk/LayoutTests/compositing/tiling/non-visible-window-tile-coverage.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/LayoutTests/ChangeLog        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -1,3 +1,16 @@
</span><ins>+2017-04-10  Andreas Kling  &lt;akling@apple.com&gt;
+
+        Don't generate extra scrolling tiles for non-visible pages.
+        https://bugs.webkit.org/show_bug.cgi?id=167213
+        &lt;rdar://problem/30105774&gt;
+
+        Reviewed by Antti Koivisto.
+
+        * TestExpectations:
+        * compositing/tiling/non-visible-window-tile-coverage-expected.txt: Added.
+        * compositing/tiling/non-visible-window-tile-coverage.html: Added.
+        * platform/mac-wk2/TestExpectations:
+
</ins><span class="cx"> 2017-04-10  Carlos Garcia Campos  &lt;cgarcia@igalia.com&gt;
</span><span class="cx"> 
</span><span class="cx">         REGRESSION(r214426): [GTK] Test media/video-click-dblckick-standalone.html started to fail in the bots after r214426
</span></span></pre></div>
<a id="trunkLayoutTestsTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/TestExpectations (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/TestExpectations        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/LayoutTests/TestExpectations        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -1247,3 +1247,6 @@
</span><span class="cx"> 
</span><span class="cx"> webkit.org/b/170355 [ Release ] fast/mediastream/MediaStream-page-muted.html [ Pass Timeout ]
</span><span class="cx"> webkit.org/b/170355 [ Debug ] fast/mediastream/MediaStream-page-muted.html [ Pass Crash ]
</span><ins>+
+# Only relevant on Mac-WK2
+compositing/tiling/non-visible-window-tile-coverage.html [ Skip ]
</ins></span></pre></div>
<a id="trunkLayoutTestscompositingtilingnonvisiblewindowtilecoverageexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/compositing/tiling/non-visible-window-tile-coverage-expected.txt (0 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/compositing/tiling/non-visible-window-tile-coverage-expected.txt                                (rev 0)
+++ trunk/LayoutTests/compositing/tiling/non-visible-window-tile-coverage-expected.txt        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -0,0 +1,49 @@
</span><ins>+Tiles when window is visible:
+
+(GraphicsLayer
+  (anchor 0.00 0.00)
+  (bounds 3008.00 3092.00)
+  (visible rect 0.00, 0.00 785.00 x 585.00)
+  (coverage rect 0.00, 0.00 785.00 x 585.00)
+  (intersects coverage rect 1)
+  (contentsScale 1.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 3008.00 3092.00)
+      (contentsOpaque 1)
+      (visible rect 0.00, 0.00 785.00 x 585.00)
+      (coverage rect 0.00, 0.00 1570.00 x 1755.00)
+      (intersects coverage rect 1)
+      (contentsScale 1.00)
+      (tile cache coverage 0, 0 2048 x 2048)
+      (tile size 512 x 512)
+      (top left tile 0, 0 tiles grid 4 x 4)
+      (in window 1)
+    )
+  )
+)
+Tiles when window is not visible:
+
+(GraphicsLayer
+  (anchor 0.00 0.00)
+  (bounds 3008.00 3438.00)
+  (visible rect 0.00, 0.00 785.00 x 585.00)
+  (coverage rect 0.00, 0.00 785.00 x 585.00)
+  (intersects coverage rect 1)
+  (contentsScale 1.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 3008.00 3438.00)
+      (contentsOpaque 1)
+      (visible rect 0.00, 0.00 785.00 x 585.00)
+      (coverage rect 0.00, 0.00 785.00 x 585.00)
+      (intersects coverage rect 1)
+      (contentsScale 1.00)
+      (tile cache coverage 0, 0 1024 x 1024)
+      (tile size 512 x 512)
+      (top left tile 0, 0 tiles grid 2 x 2)
+      (in window 1)
+    )
+  )
+)
+
</ins></span></pre></div>
<a id="trunkLayoutTestscompositingtilingnonvisiblewindowtilecoveragehtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/compositing/tiling/non-visible-window-tile-coverage.html (0 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/compositing/tiling/non-visible-window-tile-coverage.html                                (rev 0)
+++ trunk/LayoutTests/compositing/tiling/non-visible-window-tile-coverage.html        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -0,0 +1,36 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+&lt;html&gt;
+&lt;body&gt;
+&lt;p&gt;Tiles when window is visible:&lt;/p&gt;
+&lt;pre id=&quot;visibleResult&quot;&gt;&lt;/pre&gt;
+&lt;p&gt;Tiles when window is not visible:&lt;/p&gt;
+&lt;pre id=&quot;nonVisibleResult&quot;&gt;&lt;/pre&gt;
+&lt;div style=&quot;height: 3000px; width: 3000px&quot;&gt;&lt;/div&gt;
+&lt;script&gt;
+if (window.testRunner) {
+    testRunner.dumpAsText();
+    testRunner.waitUntilDone();
+    internals.setSpeculativeTilingDelayDisabledForTesting(true);
+
+    onload = function() {
+        setTimeout(function() {
+
+            document.getElementById(&quot;visibleResult&quot;).innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS | internals.LAYER_TREE_INCLUDES_TILE_CACHES);
+            document.onvisibilitychange = function() {
+                if (!document.hidden)
+                    return;
+                setTimeout(function() {
+                    document.getElementById(&quot;nonVisibleResult&quot;).innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS | internals.LAYER_TREE_INCLUDES_TILE_CACHES);
+
+                    testRunner.resetPageVisibility();
+                    internals.setSpeculativeTilingDelayDisabledForTesting(false);
+                    testRunner.notifyDone();
+                }, 0);
+            }
+            testRunner.setPageVisibility(&quot;hidden&quot;);
+        }, 0);
+    }
+}
+&lt;/script&gt;
+&lt;/body&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkLayoutTestsplatformmacwk2TestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/platform/mac-wk2/TestExpectations (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/platform/mac-wk2/TestExpectations        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/LayoutTests/platform/mac-wk2/TestExpectations        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -647,3 +647,5 @@
</span><span class="cx"> webkit.org/b/170203 fast/images/animated-image-different-dest-size.html [ Pass ImageOnlyFailure ]
</span><span class="cx"> 
</span><span class="cx"> webkit.org/b/170410 fast/images/animated-gif-webkit-transform.html [ Pass Failure ]
</span><ins>+
+compositing/tiling/non-visible-window-tile-coverage.html [ Pass ]
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/Source/WebCore/ChangeLog        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -1,3 +1,31 @@
</span><ins>+2017-04-10  Andreas Kling  &lt;akling@apple.com&gt;
+
+        Don't generate extra scrolling tiles for non-visible pages.
+        https://bugs.webkit.org/show_bug.cgi?id=167213
+        &lt;rdar://problem/30105774&gt;
+
+        Reviewed by Antti Koivisto.
+
+        Reduce the tiling coverage to a minimum when the page is non-visible.
+        On macOS, this means that fully occluded web views can maintain a smaller set of tiles
+        in non-volatile surfaces, reducing net footprint.
+
+        Test: compositing/tiling/non-visible-window-tile-coverage.html
+
+        * rendering/RenderLayerBacking.cpp:
+        (WebCore::computePageTiledBackingCoverage): If the page's activity state is non-visible, use minimal tile coverage.
+        * platform/ScrollView.h:
+        * page/FrameView.h:
+        * page/FrameView.cpp:
+        (WebCore::FrameView::hide): Call adjustTiledBackingCoverage() in hide() since it now takes page visibility into account.
+
+        (WebCore::FrameView::enableSpeculativeTilingIfNeeded):
+        * testing/Internals.cpp:
+        (WebCore::Internals::setSpeculativeTilingDelayDisabledForTesting):
+        * testing/Internals.h:
+        * testing/Internals.idl: Add an internals API for disabling the 500ms delay before speculative tiling begins after
+        the main frame load finishes. This is needed for reliably testing this change.
+
</ins><span class="cx"> 2017-04-10  Per Arne Vollan  &lt;pvollan@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Add fallback fonts to video captions stylesheet.
</span></span></pre></div>
<a id="trunkSourceWebCorepageFrameViewcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/FrameView.cpp (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/FrameView.cpp        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/Source/WebCore/page/FrameView.cpp        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -2931,6 +2931,12 @@
</span><span class="cx">     }
</span><span class="cx">     if (!shouldEnableSpeculativeTilingDuringLoading(*this))
</span><span class="cx">         return;
</span><ins>+
+    if (m_speculativeTilingDelayDisabledForTesting) {
+        speculativeTilingEnableTimerFired();
+        return;
+    }
+
</ins><span class="cx">     if (m_speculativeTilingEnableTimer.isActive())
</span><span class="cx">         return;
</span><span class="cx">     // Delay enabling a bit as load completion may trigger further loading from scripts.
</span><span class="lines">@@ -2958,6 +2964,13 @@
</span><span class="cx">         adjustTiledBackingCoverage();
</span><span class="cx">     }
</span><span class="cx"> }
</span><ins>+
+void FrameView::hide()
+{
+    ScrollView::hide();
+    adjustTiledBackingCoverage();
+}
+
</ins><span class="cx"> void FrameView::convertSubtreeLayoutToFullLayout()
</span><span class="cx"> {
</span><span class="cx">     ASSERT(m_layoutRoot);
</span></span></pre></div>
<a id="trunkSourceWebCorepageFrameViewh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/FrameView.h (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/FrameView.h        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/Source/WebCore/page/FrameView.h        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -582,6 +582,7 @@
</span><span class="cx">     void didChangeScrollOffset();
</span><span class="cx"> 
</span><span class="cx">     void show() final;
</span><ins>+    void hide() final;
</ins><span class="cx"> 
</span><span class="cx">     bool shouldPlaceBlockDirectionScrollbarOnLeft() const final;
</span><span class="cx"> 
</span><span class="lines">@@ -590,6 +591,8 @@
</span><span class="cx">     void willDestroyRenderTree();
</span><span class="cx">     void didDestroyRenderTree();
</span><span class="cx"> 
</span><ins>+    void setSpeculativeTilingDelayDisabledForTesting(bool disabled) { m_speculativeTilingDelayDisabledForTesting = disabled; }
+
</ins><span class="cx"> protected:
</span><span class="cx">     bool scrollContentsFastPath(const IntSize&amp; scrollDelta, const IntRect&amp; rectToScroll, const IntRect&amp; clipRect) final;
</span><span class="cx">     void scrollContentsSlowPath(const IntRect&amp; updateRect) final;
</span><span class="lines">@@ -862,6 +865,7 @@
</span><span class="cx"> 
</span><span class="cx">     bool m_visualUpdatesAllowedByClient;
</span><span class="cx">     bool m_hasFlippedBlockRenderers;
</span><ins>+    bool m_speculativeTilingDelayDisabledForTesting { false };
</ins><span class="cx"> 
</span><span class="cx">     ScrollPinningBehavior m_scrollPinningBehavior;
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformScrollViewh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/ScrollView.h (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/ScrollView.h        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/Source/WebCore/platform/ScrollView.h        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -349,7 +349,7 @@
</span><span class="cx"> 
</span><span class="cx">     // Widget overrides to ensure that our children's visibility status is kept up to date when we get shown and hidden.
</span><span class="cx">     WEBCORE_EXPORT void show() override;
</span><del>-    WEBCORE_EXPORT void hide() final;
</del><ins>+    WEBCORE_EXPORT void hide() override;
</ins><span class="cx">     WEBCORE_EXPORT void setParentVisible(bool) final;
</span><span class="cx">     
</span><span class="cx">     // Pan scrolling.
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayerBackingcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayerBacking.cpp (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayerBacking.cpp        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/Source/WebCore/rendering/RenderLayerBacking.cpp        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -300,6 +300,10 @@
</span><span class="cx">     // FIXME: When we use TiledBacking for overflow, this should look at RenderView scrollability.
</span><span class="cx">     FrameView&amp; frameView = backing-&gt;owningLayer().renderer().view().frameView();
</span><span class="cx"> 
</span><ins>+    // If the page is non-visible, don't incur the cost of keeping extra tiles for scrolling.
+    if (!backing-&gt;owningLayer().page().isVisible())
+        return TiledBacking::CoverageForVisibleArea;
+
</ins><span class="cx">     TiledBacking::TileCoverage tileCoverage = TiledBacking::CoverageForVisibleArea;
</span><span class="cx">     bool useMinimalTilesDuringLiveResize = frameView.inLiveResize();
</span><span class="cx">     if (frameView.speculativeTilingEnabled() &amp;&amp; !useMinimalTilesDuringLiveResize) {
</span></span></pre></div>
<a id="trunkSourceWebCoretestingInternalscpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/testing/Internals.cpp (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/testing/Internals.cpp        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/Source/WebCore/testing/Internals.cpp        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -800,6 +800,17 @@
</span><span class="cx">         backing-&gt;setTileSizeUpdateDelayDisabledForTesting(true);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+void Internals::setSpeculativeTilingDelayDisabledForTesting(bool disabled)
+{
+    Document* document = contextDocument();
+    if (!document || !document-&gt;frame())
+        return;
+
+    if (auto* frameView = document-&gt;frame()-&gt;view())
+        frameView-&gt;setSpeculativeTilingDelayDisabledForTesting(disabled);
+}
+
+
</ins><span class="cx"> Node* Internals::treeScopeRootNode(Node&amp; node)
</span><span class="cx"> {
</span><span class="cx">     return &amp;node.treeScope().rootNode();
</span></span></pre></div>
<a id="trunkSourceWebCoretestingInternalsh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/testing/Internals.h (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/testing/Internals.h        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/Source/WebCore/testing/Internals.h        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -128,6 +128,8 @@
</span><span class="cx"> 
</span><span class="cx">     void disableTileSizeUpdateDelay();
</span><span class="cx"> 
</span><ins>+    void setSpeculativeTilingDelayDisabledForTesting(bool);
+
</ins><span class="cx">     Ref&lt;CSSComputedStyleDeclaration&gt; computedStyleIncludingVisitedInfo(Element&amp;) const;
</span><span class="cx"> 
</span><span class="cx">     Node* ensureUserAgentShadowRoot(Element&amp; host);
</span></span></pre></div>
<a id="trunkSourceWebCoretestingInternalsidl"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/testing/Internals.idl (215180 => 215181)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/testing/Internals.idl        2017-04-10 12:55:07 UTC (rev 215180)
+++ trunk/Source/WebCore/testing/Internals.idl        2017-04-10 13:49:18 UTC (rev 215181)
</span><span class="lines">@@ -524,6 +524,7 @@
</span><span class="cx">     [CallWith=Document] void setAsRunningUserScripts();
</span><span class="cx"> 
</span><span class="cx">     void disableTileSizeUpdateDelay();
</span><ins>+    void setSpeculativeTilingDelayDisabledForTesting(boolean disabled);
</ins><span class="cx"> 
</span><span class="cx">     [Conditional=WEBGL] void simulateWebGLContextChanged(WebGLRenderingContextBase context);
</span><span class="cx"> 
</span></span></pre>
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