Don't cache subsequence whose layer is not fully contained by repaint rect

Source/core/paint/DisplayItemListPaintTest.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/DisplayItemListPaintTest.h"
 
 #include "core/layout/LayoutText.h"
 #include "core/layout/line/InlineTextBox.h"
 #include "core/page/FocusController.h"
@@ skipping 74 matching lines @@
         TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
         TestDisplayItem(newFirstTextBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)),
         TestDisplayItem(secondTextBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)));
 }
 
 TEST_F(DisplayItemListPaintTestForSlimmingPaintV2, FullDocumentPaintingWithCaret)
 {
     setBodyInnerHTML("<div id='div' contentEditable='true' style='outline:none'>XYZ</div>");
     document().page()->focusController().setActive(true);
     document().page()->focusController().setFocused(true);
+    DeprecatedPaintLayer& rootLayer = *layoutView().layer();
     DeprecatedPaintLayer& htmlLayer = *toLayoutBoxModelObject(document().documentElement()->layoutObject())->layer();
     Element& div = *toElement(document().body()->firstChild());
     LayoutObject& divLayoutObject = *document().body()->firstChild()->layoutObject();
     InlineTextBox& textInlineBox = *toLayoutText(div.firstChild()->layoutObject())->firstTextBox();
 
     document().view()->updateAllLifecyclePhases();
 
-    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 4,
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 6,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
         TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(textInlineBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)),
-        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence));
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
 
     div.focus();
     document().view()->updateAllLifecyclePhases();
 
-    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 5,
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 7,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
         TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(textInlineBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)),
         TestDisplayItem(divLayoutObject, DisplayItem::Caret), // New!
-        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence));
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
 }
 
 TEST_F(DisplayItemListPaintTestForSlimmingPaintV2, InlineRelayout)
 {
     setBodyInnerHTML("<div id='div' style='width:100px; height: 200px'>AAAAAAAAAA BBBBBBBBBB</div>");
+    DeprecatedPaintLayer& rootLayer = *layoutView().layer();
     DeprecatedPaintLayer& htmlLayer = *toLayoutBoxModelObject(document().documentElement()->layoutObject())->layer();
     Element& div = *toElement(document().body()->firstChild());
     LayoutBlock& divBlock = *toLayoutBlock(document().body()->firstChild()->layoutObject());
     LayoutText& text = *toLayoutText(divBlock.firstChild());
     InlineTextBox& firstTextBox = *text.firstTextBox();
 
     document().view()->updateAllLifecyclePhases();
 
-    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 4,
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 6,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
         TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(firstTextBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)),
-        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence));
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
 
     div.setAttribute(HTMLNames::styleAttr, "width: 10px; height: 200px");
     document().view()->updateAllLifecyclePhases();
 
     LayoutText& newText = *toLayoutText(divBlock.firstChild());
     InlineTextBox& newFirstTextBox = *newText.firstTextBox();
     InlineTextBox& secondTextBox = *newText.firstTextBox()->nextTextBox();
 
-    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 5,
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 7,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
         TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(newFirstTextBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)),
         TestDisplayItem(secondTextBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)),
-        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence));
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
 }
 
 TEST_F(DisplayItemListPaintTestForSlimmingPaintV2, CachedSubsequence)
 {
     setBodyInnerHTML(
         "<div id='container1' style='position: relative; width: 200px; height: 200px; background-color: blue'>"
         "  <div id='content1' style='width: 100px; height: 100px; background-color: red'></div>"
         "</div>"
         "<div id='container2' style='position: relative; width: 200px; height: 200px; background-color: blue'>"
         "  <div id='content2' style='width: 100px; height: 100px; background-color: green'></div>"
         "</div>");
     document().view()->updateAllLifecyclePhases();
 
+    DeprecatedPaintLayer& rootLayer = *layoutView().layer();
     DeprecatedPaintLayer& htmlLayer = *toLayoutBoxModelObject(document().documentElement()->layoutObject())->layer();
     LayoutObject& container1 = *document().getElementById("container1")->layoutObject();
     DeprecatedPaintLayer& container1Layer = *toLayoutBoxModelObject(container1).layer();
     LayoutObject& content1 = *document().getElementById("content1")->layoutObject();
     LayoutObject& container2 = *document().getElementById("container2")->layoutObject();
     DeprecatedPaintLayer& container2Layer = *toLayoutBoxModelObject(container2).layer();
     LayoutObject& content2 = *document().getElementById("content2")->layoutObject();
 
-    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 11,
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 13,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
         TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(container1Layer, DisplayItem::BeginSubsequence),
         TestDisplayItem(container1, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(content1, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(container1Layer, DisplayItem::EndSubsequence),
         TestDisplayItem(container2Layer, DisplayItem::BeginSubsequence),
         TestDisplayItem(container2, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(content2, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(container2Layer, DisplayItem::EndSubsequence),
-        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence));
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
 
     toHTMLElement(content1.node())->setAttribute(HTMLNames::styleAttr, "width: 100px; height: 100px; background-color: green");
-    updateLifecyclePhasesToPaintForSlimmingPaintV2Clean();
+    updateLifecyclePhasesToPaintForSlimmingPaintV2Clean(LayoutRect::infiniteRect());
 
-    EXPECT_DISPLAY_LIST_WITH_CACHED_RED_FILL_IN_DEBUG(rootDisplayItemList().newDisplayItems(), 8,
+    EXPECT_DISPLAY_LIST_WITH_CACHED_RED_FILL_IN_DEBUG(rootDisplayItemList().newDisplayItems(), 10,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(layoutView(), DisplayItem::drawingTypeToCachedDrawingType(DisplayItem::BoxDecorationBackground)),
         TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(container1Layer, DisplayItem::BeginSubsequence),
         TestDisplayItem(container1, DisplayItem::drawingTypeToCachedDrawingType(DisplayItem::BoxDecorationBackground)),
         TestDisplayItem(content1, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(container1Layer, DisplayItem::EndSubsequence),
         TestDisplayItem(container2Layer, DisplayItem::CachedSubsequence),
-        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence));
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
 
     compositeForSlimmingPaintV2();
 
-    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 11,
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 13,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
         TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
         TestDisplayItem(container1Layer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container1, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(content1, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(container1Layer, DisplayItem::EndSubsequence),
+        TestDisplayItem(container2Layer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container2, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(content2, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(container2Layer, DisplayItem::EndSubsequence),
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
+
+    // Repeated painting should just generate the root cached subsequence.
+    updateLifecyclePhasesToPaintForSlimmingPaintV2Clean();
+    EXPECT_DISPLAY_LIST_WITH_CACHED_RED_FILL_IN_DEBUG(rootDisplayItemList().newDisplayItems(), 1,
+        TestDisplayItem(rootLayer, DisplayItem::CachedSubsequence));
+
+    compositeForSlimmingPaintV2();
+
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 13,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container1Layer, DisplayItem::BeginSubsequence),
         TestDisplayItem(container1, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(content1, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(container1Layer, DisplayItem::EndSubsequence),
         TestDisplayItem(container2Layer, DisplayItem::BeginSubsequence),
         TestDisplayItem(container2, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(content2, DisplayItem::BoxDecorationBackground),
         TestDisplayItem(container2Layer, DisplayItem::EndSubsequence),
-        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence));
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
+}
+
+TEST_F(DisplayItemListPaintTestForSlimmingPaintV2, CachedSubsequenceOnInterestRectChange)
+{
+    setBodyInnerHTML(
+        "<div id='container1' style='position: relative; width: 200px; height: 200px; background-color: blue'></div>"
+        "<div id='container2' style='position: absolute; z-index: 1; width: 200px; height: 200px; background-color: blue'>"
+        "  <div id='content2' style='position: relative; top: 200px; width: 100px; height: 100px; background-color: green'></div>"
+        "</div>"
+        "<div id='container3' style='position: absolute; z-index: 2; left: 300px; top: 0; width: 200px; height: 200px; background-color: blue'></div>");
+    rootDisplayItemList().invalidateAll();
+
+    DeprecatedPaintLayer& rootLayer = *layoutView().layer();
+    DeprecatedPaintLayer& htmlLayer = *toLayoutBoxModelObject(document().documentElement()->layoutObject())->layer();
+    LayoutObject& container1 = *document().getElementById("container1")->layoutObject();
+    DeprecatedPaintLayer& container1Layer = *toLayoutBoxModelObject(container1).layer();
+    LayoutObject& container2 = *document().getElementById("container2")->layoutObject();
+    DeprecatedPaintLayer& container2Layer = *toLayoutBoxModelObject(container2).layer();
+    LayoutObject& container3 = *document().getElementById("container3")->layoutObject();
+    DeprecatedPaintLayer& container3Layer = *toLayoutBoxModelObject(container3).layer();
+
+    document().view()->updateAllLifecyclePhases(LayoutRect(0, 0, 400, 300));
+
+    // Container1 is fully in the interest rect;
+    // Container2 is partly (including its stacking chidren) in the interest rect;
+    // Content2 is out of the interest rect and output nothing;
+    // Container3 is fully in the interest rect.
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 14,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container1Layer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container1, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(container1Layer, DisplayItem::EndSubsequence),
+        TestDisplayItem(container2Layer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container2, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(container2Layer, DisplayItem::EndSubsequence),
+        TestDisplayItem(container3Layer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container3, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(container3Layer, DisplayItem::EndSubsequence),
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
+
+    // Container1 becomes partly in the interest rect, but uses cached subsequence
+    // because it was fully painted before;
+    // Container2's intersection with the interest rect changes;
+    // Content2 is out of the interest rect and outputs nothing;
+    // Container3 becomes out of the interest rect and outputs nothing.
+    updateLifecyclePhasesToPaintForSlimmingPaintV2Clean(LayoutRect(0, 100, 300, 300));
+
+    EXPECT_DISPLAY_LIST_WITH_CACHED_RED_FILL_IN_DEBUG(rootDisplayItemList().newDisplayItems(), 9,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(layoutView(), DisplayItem::drawingTypeToCachedDrawingType(DisplayItem::BoxDecorationBackground)),
+        TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container1Layer, DisplayItem::CachedSubsequence),
+        TestDisplayItem(container2Layer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container2, DisplayItem::drawingTypeToCachedDrawingType(DisplayItem::BoxDecorationBackground)),
+        TestDisplayItem(container2Layer, DisplayItem::EndSubsequence),
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
+
+    compositeForSlimmingPaintV2();
+
+    EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG(rootDisplayItemList().displayItems(), 11,
+        TestDisplayItem(rootLayer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(layoutView(), DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(htmlLayer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container1Layer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container1, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(container1Layer, DisplayItem::EndSubsequence),
+        TestDisplayItem(container2Layer, DisplayItem::BeginSubsequence),
+        TestDisplayItem(container2, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(container2Layer, DisplayItem::EndSubsequence),
+        TestDisplayItem(htmlLayer, DisplayItem::EndSubsequence),
+        TestDisplayItem(rootLayer, DisplayItem::EndSubsequence));
 }
 
 } // namespace blink