cc: Visualize non-occluding rects in composited layers.

cc/debug_rect_history.h

 // Copyright 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 CC_DEBUG_RECT_HISTORY_H_
 #define CC_DEBUG_RECT_HISTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/rect.h"
@@ skipping 17 matching lines @@
 // - Surface damage rects: the aggregate damage on a target surface that is caused by all
 //   layers and surfaces that contribute to it. This includes (1) paint rects, (2) property-
 //   changed rects, and (3) newly exposed areas.
 //
 // - Screen space rects: this is the region the contents occupy in screen space.
 //
 // - Replica screen space rects: this is the region the replica's contents occupy in screen space.
 //
 // - Occluding rects: these are the regions that contribute to the occluded region.
 //
-enum DebugRectType { PaintRectType, PropertyChangedRectType, SurfaceDamageRectType, ScreenSpaceRectType, ReplicaScreenSpaceRectType, OccludingRectType };
+// - Non-Occluding rects: these are the regions of composited layers that do not
+//   contribute to the occluded region.
+//
+enum DebugRectType { PaintRectType, PropertyChangedRectType, SurfaceDamageRectType, ScreenSpaceRectType, ReplicaScreenSpaceRectType, OccludingRectType, NonOccludingRectType };
 
 struct DebugRect {
     DebugRect(DebugRectType newType, gfx::RectF newRect)
             : type(newType)
             , rect(newRect) { }
 
     DebugRectType type;
     gfx::RectF rect;
 };
 
 // This class maintains a history of rects of various types that can be used
 // for debugging purposes. The overhead of collecting rects is performed only if
 // the appropriate LayerTreeSettings are enabled.
 class DebugRectHistory {
 public:
     static scoped_ptr<DebugRectHistory> create();
 
     ~DebugRectHistory();
 
     // Note: Saving debug rects must happen before layers' change tracking is reset.
-    void saveDebugRectsForCurrentFrame(LayerImpl* rootLayer, const std::vector<LayerImpl*>& renderSurfaceLayerList, const std::vector<gfx::Rect>& occludingScreenSpaceRects, const LayerTreeSettings&);
+    void saveDebugRectsForCurrentFrame(LayerImpl* rootLayer, const std::vector<LayerImpl*>& renderSurfaceLayerList, const std::vector<gfx::Rect>& occludingScreenSpaceRects, const std::vector<gfx::Rect>& nonOccludingScreenSpaceRects, const LayerTreeSettings&);
 
     const std::vector<DebugRect>& debugRects() { return m_debugRects; }
 
 private:
     DebugRectHistory();
 
     void savePaintRects(LayerImpl*);
     void savePropertyChangedRects(const std::vector<LayerImpl*>& renderSurfaceLayerList);
     void saveSurfaceDamageRects(const std::vector<LayerImpl* >& renderSurfaceLayerList);
     void saveScreenSpaceRects(const std::vector<LayerImpl* >& renderSurfaceLayerList);
     void saveOccludingRects(const std::vector<gfx::Rect>& occludingScreenSpaceRects);
+    void saveNonOccludingRects(const std::vector<gfx::Rect>& nonOccludingScreenSpaceRects);
 
     std::vector<DebugRect> m_debugRects;
 
     DISALLOW_COPY_AND_ASSIGN(DebugRectHistory);
 };
 
 }  // namespace cc
 
 #endif  // CC_DEBUG_RECT_HISTORY_H_