Mark foregroundLayer under scrollingContentsLayer GraphicsLayerPaintOverflowContents

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/compositing/CompositedLayerMapping.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
@@ skipping 583 matching lines @@
 
     // Scroll 3000 pixels down to bring the scrollable area to somewhere in the middle.
     frameDocument.view()->setScrollPosition(DoublePoint(0.0, 3000.0), ProgrammaticScroll);
     document().view()->updateAllLifecyclePhases();
 
     ASSERT_TRUE(frameDocument.view()->layoutView()->hasLayer());
     // The width is 485 pixels due to the size of the scrollbar.
     EXPECT_RECT_EQ(IntRect(0, 0, 500, 7500), recomputeInterestRect(frameDocument.view()->layoutView()->enclosingLayer()->graphicsLayerBacking()));
 }
 
+TEST_F(CompositedLayerMappingTest, ScrollingContentsAndForegroundLayerPaintingPhase)
+{
+    document().frame()->settings()->setPreferCompositingToLCDTextEnabled(true);
+    setBodyInnerHTML(
+        "<div id='container' style='position: relative; z-index: 1; overflow: scroll; width: 300px; height: 300px'>"
+        "    <div id='negative-composited-child' style='background-color: red; width: 1px; height: 1px; position: absolute; backface-visibility: hidden; z-index: -1'></div>"
+        "    <div style='background-color: blue; width: 2000px; height: 2000px; position: relative; top: 10px'></div>"
+        "</div>");
+
+    CompositedLayerMapping* mapping = toLayoutBlock(getLayoutObjectByElementId("container"))->layer()->compositedLayerMapping();
+    ASSERT_TRUE(mapping->scrollingContentsLayer());
+    EXPECT_EQ(static_cast<GraphicsLayerPaintingPhase>(GraphicsLayerPaintOverflowContents | GraphicsLayerPaintCompositedScroll), mapping->scrollingContentsLayer()->paintingPhase());
+    ASSERT_TRUE(mapping->foregroundLayer());
+    EXPECT_EQ(static_cast<GraphicsLayerPaintingPhase>(GraphicsLayerPaintForeground | GraphicsLayerPaintOverflowContents), mapping->foregroundLayer()->paintingPhase());
+
+    Element* negativeCompositedChild = document().getElementById("negative-composited-child");
+    negativeCompositedChild->parentNode()->removeChild(negativeCompositedChild);
+    document().view()->updateAllLifecyclePhases();
+
+    mapping = toLayoutBlock(getLayoutObjectByElementId("container"))->layer()->compositedLayerMapping();
+    ASSERT_TRUE(mapping->scrollingContentsLayer());
+    EXPECT_EQ(static_cast<GraphicsLayerPaintingPhase>(GraphicsLayerPaintOverflowContents | GraphicsLayerPaintCompositedScroll | GraphicsLayerPaintForeground), mapping->scrollingContentsLayer()->paintingPhase());
+    EXPECT_FALSE(mapping->foregroundLayer());
+}
+
 } // namespace blink