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

third_party/WebKit/Source/core/paint/PaintInvalidator.h

 // Copyright 2016 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.
 
 #ifndef PaintInvalidator_h
 #define PaintInvalidator_h
 
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/paint/GeometryMapper.h"
 #include "wtf/Vector.h"
@@ skipping 26 matching lines @@
   // This method is temporary to adapt PaintInvalidatorContext and the legacy
   // PaintInvalidationState for code shared by old code and new code.
   virtual void mapLocalRectToPaintInvalidationBacking(const LayoutObject&,
                                                       LayoutRect&) const;
 
   const PaintPropertyTreeBuilderContext& treeBuilderContext;
   const PaintInvalidatorContext* parentContext;
 
   enum ForcedSubtreeInvalidationFlag {
     ForcedSubtreeInvalidationChecking = 1 << 0,
-    ForcedSubtreeInvalidationRectUpdate = 1 << 1,
+    ForcedSubtreeVisualRectUpdate = 1 << 1,
     ForcedSubtreeFullInvalidation = 1 << 2,
     ForcedSubtreeFullInvalidationForStackedContents = 1 << 3,
     ForcedSubtreeSVGResourceChange = 1 << 4,
     // TODO(crbug.com/637313): This is temporary before we support filters in
     // paint property tree.
     ForcedSubtreeSlowPathRect = 1 << 5,
   };
   unsigned forcedSubtreeInvalidationFlags = 0;
 
   // The following fields can be null only before
@@ skipping 33 matching lines @@
   PaintInvalidator(GeometryMapper& geometryMapper)
       : m_geometryMapper(geometryMapper) {}
 
   void invalidatePaintIfNeeded(FrameView&, PaintInvalidatorContext&);
   void invalidatePaintIfNeeded(const LayoutObject&, PaintInvalidatorContext&);
 
   // Process objects needing paint invalidation on the next frame.
   // See the definition of PaintInvalidationDelayedFull for more details.
   void processPendingDelayedPaintInvalidations();
 
+  bool needsVisualRectUpdate(const LayoutObject&,
+                             const PaintInvalidatorContext&);
+
  private:
   ALWAYS_INLINE LayoutRect
   computeVisualRectInBacking(const LayoutObject&,
                              const PaintInvalidatorContext&);
   ALWAYS_INLINE LayoutPoint
   computeLocationInBacking(const LayoutObject&, const PaintInvalidatorContext&);
   ALWAYS_INLINE void updatePaintingLayer(const LayoutObject&,
                                          PaintInvalidatorContext&);
   ALWAYS_INLINE void updatePaintInvalidationContainer(const LayoutObject&,
                                                       PaintInvalidatorContext&);
+  ALWAYS_INLINE void updateVisualRectIfNeeded(const LayoutObject&,
+                                              PaintInvalidatorContext&);
   ALWAYS_INLINE void updateVisualRect(const LayoutObject&,
                                       PaintInvalidatorContext&);
 
   Vector<const LayoutObject*> m_pendingDelayedPaintInvalidations;
   GeometryMapper& m_geometryMapper;
 };
 
 }  // namespace blink
 
 #endif  // PaintInvalidator_h