[SPInvalidation] Handle pixel-snapping of paint invalidation rects

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 1187 matching lines @@
   LayoutView* v = view();
   if (v->document().printing())
     return PaintInvalidationNone;  // Don't invalidate paints if we're printing.
 
   PaintInvalidatorContextAdapter context(paintInvalidationState);
 
   const LayoutBoxModelObject& paintInvalidationContainer =
       paintInvalidationState.paintInvalidationContainer();
   DCHECK(paintInvalidationContainer == containerForPaintInvalidation());
 
-  context.oldBounds = previousPaintInvalidationRect();
+  context.oldBounds.rect = previousPaintInvalidationRect();
   context.oldLocation = previousPositionFromPaintInvalidationBacking();
-  context.newBounds =
+  context.newBounds.rect =
       paintInvalidationState.computePaintInvalidationRectInBacking();
   context.newLocation =
       paintInvalidationState.computePositionFromPaintInvalidationBacking();
 
   IntSize adjustment =
       scrollAdjustmentForPaintInvalidation(paintInvalidationContainer);
   context.newLocation.move(adjustment);
-  context.newBounds.move(adjustment);
+  context.newBounds.rect.move(adjustment);
 
-  adjustVisualRectForRasterEffects(context.newBounds);
+  adjustVisualRectForRasterEffects(context.newBounds.rect);
 
-  setPreviousPaintInvalidationRect(context.newBounds);
+  setPreviousPaintInvalidationRect(context.newBounds.rect);
   setPreviousPositionFromPaintInvalidationBacking(context.newLocation);
 
   if (!shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState() &&
       paintInvalidationState
           .forcedSubtreeInvalidationRectUpdateWithinContainerOnly()) {
     // We are done updating the paint invalidation rect. No other paint
     // invalidation work to do for this object.
     return PaintInvalidationNone;
   }
 
@@ skipping 2324 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->parent())
       root = root->parent();
     root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif