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// Copyright 2011 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_DAMAGE_TRACKER_H_
#define CC_DAMAGE_TRACKER_H_
#include "base/hash_tables.h"
#include "base/memory/scoped_ptr.h"
#include "cc/cc_export.h"
#include "ui/gfx/rect_f.h"
#include <vector>
class SkImageFilter;
namespace gfx {
class Rect;
}
namespace WebKit {
class WebFilterOperations;
}
namespace cc {
class LayerImpl;
class RenderSurfaceImpl;
// Computes the region where pixels have actually changed on a RenderSurfaceImpl. This region is used
// to scissor what is actually drawn to the screen to save GPU computation and bandwidth.
class CC_EXPORT DamageTracker {
public:
static scoped_ptr<DamageTracker> create();
~DamageTracker();
void didDrawDamagedArea() { m_currentDamageRect = gfx::RectF(); }
void forceFullDamageNextUpdate() { m_forceFullDamageNextUpdate = true; }
void updateDamageTrackingState(const std::vector<LayerImpl*>& layerList, int targetSurfaceLayerID, bool targetSurfacePropertyChangedOnlyFromDescendant, const gfx::Rect& targetSurfaceContentRect, LayerImpl* targetSurfaceMaskLayer, const WebKit::WebFilterOperations&, SkImageFilter* filter);
const gfx::RectF& currentDamageRect() { return m_currentDamageRect; }
private:
DamageTracker();
gfx::RectF trackDamageFromActiveLayers(const std::vector<LayerImpl*>& layerList, int targetSurfaceLayerID);
gfx::RectF trackDamageFromSurfaceMask(LayerImpl* targetSurfaceMaskLayer);
gfx::RectF trackDamageFromLeftoverRects();
gfx::RectF removeRectFromCurrentFrame(int layerID, bool& layerIsNew);
void saveRectForNextFrame(int layerID, const gfx::RectF& targetSpaceRect);
// These helper functions are used only in trackDamageFromActiveLayers().
void extendDamageForLayer(LayerImpl*, gfx::RectF& targetDamageRect);
void extendDamageForRenderSurface(LayerImpl*, gfx::RectF& targetDamageRect);
// To correctly track exposed regions, two hashtables of rects are maintained.
// The "current" map is used to compute exposed regions of the current frame, while
// the "next" map is used to collect layer rects that are used in the next frame.
typedef base::hash_map<int, gfx::RectF> RectMap;
scoped_ptr<RectMap> m_currentRectHistory;
scoped_ptr<RectMap> m_nextRectHistory;
gfx::RectF m_currentDamageRect;
bool m_forceFullDamageNextUpdate;
DISALLOW_COPY_AND_ASSIGN(DamageTracker);
};
} // namespace cc
#endif // CC_DAMAGE_TRACKER_H_
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