New display item caching

Source/core/paint/ViewDisplayListTest.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 "config.h"
 
 #include "core/paint/LayerClipRecorder.h"
 #include "core/paint/LayerPainter.h"
 #include "core/paint/RenderDrawingRecorder.h"
 #include "core/rendering/RenderView.h"
@@ skipping 501 matching lines @@
     document().view()->updateLayoutAndStyleForPainting();
     LayerPainter(*rootLayer).paintLayerContents(&context, paintingInfo, PaintLayerPaintingCompositingAllPhases);
     rootDisplayItemList().endNewPaints();
 
     EXPECT_DISPLAY_LIST(rootDisplayItemList().paintList(), 3,
         TestDisplayItem(htmlRenderer, DisplayItem::DrawingPaintPhaseBlockBackground),
         TestDisplayItem(textRenderer, DisplayItem::DrawingPaintPhaseForeground),
         TestDisplayItem(divRenderer, DisplayItem::DrawingPaintPhaseCaret));
 }
 
+TEST_F(ViewDisplayListTest, ComplexUpdateSwapOrder)
+{
+    setBodyInnerHTML("<div id='container1'><div id='content1'></div></div>"
+        "<div id='container2'><div id='content2'></div></div>");
+    RenderObject* container1 = document().body()->firstChild()->renderer();
+    RenderObject* content1 = document().body()->firstChild()->firstChild()->renderer();
+    RenderObject* container2 = document().body()->firstChild()->nextSibling()->renderer();
+    RenderObject* content2 = document().body()->firstChild()->nextSibling()->firstChild()->renderer();
+    GraphicsContext context(nullptr, &rootDisplayItemList());
+
+    drawRect(&context, container1, PaintPhaseBlockBackground, FloatRect(100, 100, 100, 100));
+    drawRect(&context, content1, PaintPhaseBlockBackground, FloatRect(100, 100, 50, 200));
+    drawRect(&context, content1, PaintPhaseForeground, FloatRect(100, 100, 50, 200));
+    drawRect(&context, container1, PaintPhaseForeground, FloatRect(100, 100, 100, 100));
+    drawRect(&context, container2, PaintPhaseBlockBackground, FloatRect(100, 200, 100, 100));
+    drawRect(&context, content2, PaintPhaseBlockBackground, FloatRect(100, 200, 50, 200));
+    drawRect(&context, content2, PaintPhaseForeground, FloatRect(100, 200, 50, 200));
+    drawRect(&context, container2, PaintPhaseForeground, FloatRect(100, 200, 100, 100));
+    rootDisplayItemList().endNewPaints();
+
+    EXPECT_DISPLAY_LIST(rootDisplayItemList().paintList(), 8,
+        TestDisplayItem(container1, DisplayItem::DrawingPaintPhaseBlockBackground),
+        TestDisplayItem(content1, DisplayItem::DrawingPaintPhaseBlockBackground),
+        TestDisplayItem(content1, DisplayItem::DrawingPaintPhaseForeground),
+        TestDisplayItem(container1, DisplayItem::DrawingPaintPhaseForeground),
+        TestDisplayItem(container2, DisplayItem::DrawingPaintPhaseBlockBackground),
+        TestDisplayItem(content2, DisplayItem::DrawingPaintPhaseBlockBackground),
+        TestDisplayItem(content2, DisplayItem::DrawingPaintPhaseForeground),
+        TestDisplayItem(container2, DisplayItem::DrawingPaintPhaseForeground));
+
+    rootDisplayItemList().invalidate(container1->displayItemClient());
+    drawRect(&context, container2, PaintPhaseBlockBackground, FloatRect(100, 200, 100, 100));
+    drawRect(&context, content2, PaintPhaseBlockBackground, FloatRect(100, 200, 50, 200));
+    drawRect(&context, content2, PaintPhaseForeground, FloatRect(100, 200, 50, 200));
+    drawRect(&context, container2, PaintPhaseForeground, FloatRect(100, 200, 100, 100));
+    drawRect(&context, container1, PaintPhaseBlockBackground, FloatRect(100, 100, 100, 100));
+    drawRect(&context, content1, PaintPhaseBlockBackground, FloatRect(100, 100, 50, 200));
+    drawRect(&context, content1, PaintPhaseForeground, FloatRect(100, 100, 50, 200));
+    drawRect(&context, container1, PaintPhaseForeground, FloatRect(100, 100, 100, 100));
+    rootDisplayItemList().endNewPaints();
+
+    EXPECT_DISPLAY_LIST(rootDisplayItemList().paintList(), 8,
+        TestDisplayItem(container2, DisplayItem::DrawingPaintPhaseBlockBackground),
+        TestDisplayItem(content2, DisplayItem::DrawingPaintPhaseBlockBackground),
+        TestDisplayItem(content2, DisplayItem::DrawingPaintPhaseForeground),
+        TestDisplayItem(container2, DisplayItem::DrawingPaintPhaseForeground),
+        TestDisplayItem(container1, DisplayItem::DrawingPaintPhaseBlockBackground),
+        TestDisplayItem(content1, DisplayItem::DrawingPaintPhaseBlockBackground),
+        TestDisplayItem(content1, DisplayItem::DrawingPaintPhaseForeground),
+        TestDisplayItem(container1, DisplayItem::DrawingPaintPhaseForeground));
+}
+
 } // anonymous namespace
 } // namespace blink