Snap layers in views to physical pixel

ui/views/view.h

 // Copyright (c) 2012 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 UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 375 matching lines @@
   // parent views do not change.
   void InvalidateLayout();
 
   // Gets/Sets the Layout Manager used by this view to size and place its
   // children.
   // The LayoutManager is owned by the View and is deleted when the view is
   // deleted, or when a new LayoutManager is installed.
   LayoutManager* GetLayoutManager() const;
   void SetLayoutManager(LayoutManager* layout);
 
+  // Adjust the layer's offset so that it snaps to the physical pixel boundary.
+  // This has no effect if the view does not have an associated layer.
+  void SnapLayerToPixelBoundary();
+
   // Attributes ----------------------------------------------------------------
 
   // The view class name.
   static const char kViewClassName[];
 
   // Return the receiving view's class name. A view class is a string which
   // uniquely identifies the view class. It is intended to be used as a way to
   // find out during run time if a view can be safely casted to a specific view
   // subclass. The default implementation returns kViewClassName.
   virtual const char* GetClassName() const;
@@ skipping 1140 matching lines @@
 
   // Layout --------------------------------------------------------------------
 
   // Whether the view needs to be laid out.
   bool needs_layout_;
 
   // The View's LayoutManager defines the sizing heuristics applied to child
   // Views. The default is absolute positioning according to bounds_.
   scoped_ptr<LayoutManager> layout_manager_;
 
+  // Whether this View's layer should be snapped to the pixel boundary.
+  bool snap_layer_to_pixel_boundary_;
+
   // Painting ------------------------------------------------------------------
 
   // Background
   scoped_ptr<Background> background_;
 
   // Border.
   scoped_ptr<Border> border_;
 
   // RTL painting --------------------------------------------------------------
 
@@ skipping 50 matching lines @@
   // Belongs to this view, but it's reference-counted on some platforms
   // so we can't use a scoped_ptr. It's dereferenced in the destructor.
   NativeViewAccessibility* native_view_accessibility_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_