Initial PaintInvalidationState support for SVG

Source/core/rendering/svg/RenderSVGModelObject.cpp

 /*
  * Copyright (c) 2009, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 107 matching lines @@
     return false;
 }
 
 // The SVG addFocusRingRects() method adds rects in local coordinates so the default absoluteFocusRingQuads
 // returns incorrect values for SVG objects. Overriding this method provides access to the absolute bounds.
 void RenderSVGModelObject::absoluteFocusRingQuads(Vector<FloatQuad>& quads)
 {
     quads.append(localToAbsoluteQuad(FloatQuad(paintInvalidationRectInLocalCoordinates())));
 }
 
-InvalidationReason RenderSVGModelObject::invalidatePaintIfNeeded(const PaintInvalidationState& paintInvalidationState, const RenderLayerModelObject& paintInvalidationContainer)
+void RenderSVGModelObject::invalidateTreeIfNeeded(const PaintInvalidationState& paintInvalidationState)
 {
-    ForceHorriblySlowRectMapping slowRectMapping(&paintInvalidationState);
+    ASSERT(!needsLayout());
 
-    return RenderObject::invalidatePaintIfNeeded(paintInvalidationState, paintInvalidationContainer);
+    // If we didn't need paint invalidation then our children don't need as well.
+    // Skip walking down the tree as everything should be fine below us.
+    if (!shouldCheckForPaintInvalidation(paintInvalidationState))
+        return;
+
+    invalidatePaintIfNeeded(paintInvalidationState, paintInvalidationState.paintInvalidationContainer());
+    clearPaintInvalidationState(paintInvalidationState);
+
+    PaintInvalidationState childPaintInvalidationState(paintInvalidationState, *this);
+    invalidatePaintOfSubtreesIfNeeded(childPaintInvalidationState);
 }
 
 } // namespace blink