Use table as display item client for painting composited collapsed table cell borders.

third_party/WebKit/Source/core/layout/LayoutTableCell.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 14 matching lines @@
 
 #include "core/layout/LayoutTableCell.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/StylePropertySet.h"
 #include "core/html/HTMLTableCellElement.h"
 #include "core/layout/LayoutAnalyzer.h"
 #include "core/layout/LayoutTableCol.h"
 #include "core/layout/SubtreeLayoutScope.h"
 #include "core/paint/ObjectPaintInvalidator.h"
+#include "core/paint/PaintLayer.h"
 #include "core/paint/TableCellPainter.h"
 #include "core/style/CollapsedBorderValue.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/TransformState.h"
 #include "wtf/PtrUtil.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
@@ skipping 13 matching lines @@
       m_absoluteColumnIndex(unsetColumnIndex),
       m_cellWidthChanged(false),
       m_intrinsicPaddingBefore(0),
       m_intrinsicPaddingAfter(0) {
   // We only update the flags when notified of DOM changes in
   // colSpanOrRowSpanChanged() so we need to set their initial values here in
   // case something asks for colSpan()/rowSpan() before then.
   updateColAndRowSpanFlags();
 }
 
+LayoutTableCell::CollapsedBorderValues::CollapsedBorderValues(
+    const LayoutTable& layoutTable,
+    const CollapsedBorderValue& startBorder,
+    const CollapsedBorderValue& endBorder,
+    const CollapsedBorderValue& beforeBorder,
+    const CollapsedBorderValue& afterBorder)
+    : m_layoutTable(layoutTable),
+      m_startBorder(startBorder),
+      m_endBorder(endBorder),
+      m_beforeBorder(beforeBorder),
+      m_afterBorder(afterBorder) {}
+
+void LayoutTableCell::CollapsedBorderValues::setCollapsedBorderValues(
+    const CollapsedBorderValues& other) {
+  m_startBorder = other.startBorder();
+  m_endBorder = other.endBorder();
+  m_beforeBorder = other.beforeBorder();
+  m_afterBorder = other.afterBorder();
+}
+
+String LayoutTableCell::CollapsedBorderValues::debugName() const {
+  return "CollapsedBorderValues";
+}
+
+LayoutRect LayoutTableCell::CollapsedBorderValues::visualRect() const {
+  return m_layoutTable.visualRect();
+}
+
 void LayoutTableCell::willBeRemovedFromTree() {
   LayoutBlockFlow::willBeRemovedFromTree();
 
   section()->setNeedsCellRecalc();
 
   // When borders collapse, removing a cell can affect the the width of
   // neighboring cells.
   LayoutTable* enclosingTable = table();
   DCHECK(enclosingTable);
   if (!enclosingTable->collapseBorders())
@@ skipping 1179 matching lines @@
   size_t count = borderValues.size();
   for (size_t i = 0; i < count; ++i) {
     if (borderValues[i].isSameIgnoringColor(borderValue))
       return;
   }
   borderValues.append(borderValue);
 }
 
 void LayoutTableCell::collectBorderValues(
     LayoutTable::CollapsedBorderValues& borderValues) {
-  CollapsedBorderValues newValues = {
-      computeCollapsedStartBorder(), computeCollapsedEndBorder(),
-      computeCollapsedBeforeBorder(), computeCollapsedAfterBorder()};
+  CollapsedBorderValues newValues(
+      *table(), computeCollapsedStartBorder(), computeCollapsedEndBorder(),
+      computeCollapsedBeforeBorder(), computeCollapsedAfterBorder());
 
   bool changed = false;
-  if (!newValues.startBorder.isVisible() && !newValues.endBorder.isVisible() &&
-      !newValues.beforeBorder.isVisible() &&
-      !newValues.afterBorder.isVisible()) {
+  if (!newValues.startBorder().isVisible() &&
+      !newValues.endBorder().isVisible() &&
+      !newValues.beforeBorder().isVisible() &&
+      !newValues.afterBorder().isVisible()) {
     changed = !!m_collapsedBorderValues;
     m_collapsedBorderValues = nullptr;
   } else if (!m_collapsedBorderValues) {
     changed = true;
-    m_collapsedBorderValues = wrapUnique(new CollapsedBorderValues(newValues));
+    m_collapsedBorderValues = wrapUnique(new CollapsedBorderValues(
+        *table(), newValues.startBorder(), newValues.endBorder(),
+        newValues.beforeBorder(), newValues.afterBorder()));
   } else {
     // We check visuallyEquals so that the table cell is invalidated only if a
     // changed collapsed border is visible in the first place.
-    changed = !m_collapsedBorderValues->startBorder.visuallyEquals(
-                  newValues.startBorder) ||
-              !m_collapsedBorderValues->endBorder.visuallyEquals(
-                  newValues.endBorder) ||
-              !m_collapsedBorderValues->beforeBorder.visuallyEquals(
-                  newValues.beforeBorder) ||
-              !m_collapsedBorderValues->afterBorder.visuallyEquals(
-                  newValues.afterBorder);
+    changed = !m_collapsedBorderValues->startBorder().visuallyEquals(
+                  newValues.startBorder()) ||
+              !m_collapsedBorderValues->endBorder().visuallyEquals(
+                  newValues.endBorder()) ||
+              !m_collapsedBorderValues->beforeBorder().visuallyEquals(
+                  newValues.beforeBorder()) ||
+              !m_collapsedBorderValues->afterBorder().visuallyEquals(
+                  newValues.afterBorder());
     if (changed)
-      *m_collapsedBorderValues = newValues;
+      m_collapsedBorderValues->setCollapsedBorderValues(newValues);
   }
 
   // If collapsed borders changed, invalidate the cell's display item client on
   // the table's backing.
   // TODO(crbug.com/451090#c5): Need a way to invalidate/repaint the borders
   // only.
   if (changed)
     ObjectPaintInvalidator(*table())
         .slowSetPaintingLayerNeedsRepaintAndInvalidateDisplayItemClient(
             *this, PaintInvalidationStyleChange);
 
-  addBorderStyle(borderValues, newValues.startBorder);
-  addBorderStyle(borderValues, newValues.endBorder);
-  addBorderStyle(borderValues, newValues.beforeBorder);
-  addBorderStyle(borderValues, newValues.afterBorder);
+  addBorderStyle(borderValues, newValues.startBorder());
+  addBorderStyle(borderValues, newValues.endBorder());
+  addBorderStyle(borderValues, newValues.beforeBorder());
+  addBorderStyle(borderValues, newValues.afterBorder());
 }
 
 void LayoutTableCell::sortBorderValues(
     LayoutTable::CollapsedBorderValues& borderValues) {
   std::sort(borderValues.begin(), borderValues.end(), compareBorders);
 }
 
 void LayoutTableCell::paintBoxDecorationBackground(
     const PaintInfo& paintInfo,
     const LayoutPoint& paintOffset) const {
@@ skipping 64 matching lines @@
 bool LayoutTableCell::backgroundIsKnownToBeOpaqueInRect(
     const LayoutRect& localRect) const {
   // If this object has layer, the area of collapsed borders should be
   // transparent to expose the collapsed borders painted on the underlying
   // layer.
   if (hasLayer() && table()->collapseBorders())
     return false;
   return LayoutBlockFlow::backgroundIsKnownToBeOpaqueInRect(localRect);
 }
 
+bool LayoutTableCell::usesTableAsDisplayItemClient() const {
+  return (hasLayer() && layer()->compositingState() != NotComposited) ||

[chrishtr, 2016/10/19 01:13:21]

Add a note explaining this conditional.

[wkorman, 2016/10/19 23:07:39]

Done.

+         RuntimeEnabledFeatures::slimmingPaintV2Enabled();
+}
+
+void LayoutTableCell::invalidateDisplayItemClients(
+    PaintInvalidationReason reason) const {
+  if (m_collapsedBorderValues && usesTableAsDisplayItemClient()) {
+    ObjectPaintInvalidator(*this).invalidateDisplayItemClient(
+        *m_collapsedBorderValues, reason);
+  }
+  LayoutBlockFlow::invalidateDisplayItemClients(reason);
+}
+
 // TODO(lunalu): Deliberately dump the "inner" box of table cells, since that
 // is what current results reflect.  We'd like to clean up the results to dump
 // both the outer box and the intrinsic padding so that both bits of information
 // are captured by the results.
 LayoutRect LayoutTableCell::debugRect() const {
   LayoutRect rect = LayoutRect(
       location().x(), location().y() + intrinsicPaddingBefore(), size().width(),
       size().height() - intrinsicPaddingBefore() - intrinsicPaddingAfter());
 
   LayoutBlock* cb = containingBlock();
   if (cb)
     cb->adjustChildDebugRect(rect);
 
   return rect;
 }
 
 void LayoutTableCell::adjustChildDebugRect(LayoutRect& r) const {
   r.move(0, -intrinsicPaddingBefore());
 }
 
 }  // namespace blink