Skip paint property update and visual rect update if no geometry change

third_party/WebKit/Source/core/editing/CaretDisplayItemClient.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 113 matching lines @@
   // previous paint invalidated block will be invalidated. We don't care about
   // intermediate changes of layoutBlock because they are not painted.
   if (!m_previousLayoutBlock) {
     m_previousLayoutBlock = m_layoutBlock;
     m_visualRectInPreviousLayoutBlock = m_visualRect;
   }
 
   LayoutBlock* newLayoutBlock = caretLayoutBlock(caretPosition.anchorNode());
   if (newLayoutBlock != m_layoutBlock) {
     if (m_layoutBlock)
-      m_layoutBlock->setMayNeedPaintInvalidation();
+      m_layoutBlock->setMayNeedPaintInvalidationWithoutGeometryChange();
     m_layoutBlock = newLayoutBlock;
     if (newLayoutBlock)
       m_needsPaintInvalidation = true;
     m_visualRect = LayoutRect();
   }
 
   if (!newLayoutBlock) {
     m_color = Color();
     m_localRect = LayoutRect();
     return;
   }
 
   Color newColor;
   if (caretPosition.anchorNode()) {
     newColor = caretPosition.anchorNode()->layoutObject()->resolveColor(
         CSSPropertyCaretColor);
   }
   if (newColor != m_color) {
     m_needsPaintInvalidation = true;
     m_color = newColor;
   }
 
   LayoutRect newLocalRect = computeCaretRect(caretPosition);
   if (newLocalRect != m_localRect) {
     m_needsPaintInvalidation = true;
     m_localRect = newLocalRect;
   }
 
   if (m_needsPaintInvalidation)
-    newLayoutBlock->setMayNeedPaintInvalidation();
+    newLayoutBlock->setMayNeedPaintInvalidationWithoutGeometryChange();
 }
 
 void CaretDisplayItemClient::invalidatePaintIfNeeded(
     const LayoutBlock& block,
     const PaintInvalidatorContext& context) {
   if (block == m_layoutBlock) {
     invalidatePaintInCurrentLayoutBlock(context);
     return;
   }
 
@@ skipping 91 matching lines @@
 
 String CaretDisplayItemClient::debugName() const {
   return "Caret";
 }
 
 LayoutRect CaretDisplayItemClient::visualRect() const {
   return m_visualRect;
 }
 
 }  // namespace blink