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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_TREES_DAMAGE_TRACKER_H_
#define CC_TREES_DAMAGE_TRACKER_H_
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "cc/base/cc_export.h"
#include "cc/layers/layer_lists.h"
#include "ui/gfx/geometry/rect.h"
class SkImageFilter;
namespace gfx {
class Rect;
}
namespace cc {
class FilterOperations;
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() { current_damage_rect_ = gfx::Rect(); }
void AddDamageNextUpdate(const gfx::Rect& dmg) {
current_damage_rect_.Union(dmg);
}
void UpdateDamageTrackingState(
const LayerImplList& layer_list,
int target_surface_layer_id,
bool target_surface_property_changed_only_from_descendant,
const gfx::Rect& target_surface_content_rect,
LayerImpl* target_surface_mask_layer,
const FilterOperations& filters);
gfx::Rect current_damage_rect() { return current_damage_rect_; }
private:
DamageTracker();
gfx::Rect TrackDamageFromActiveLayers(const LayerImplList& layer_list,
int target_surface_layer_id);
gfx::Rect TrackDamageFromSurfaceMask(LayerImpl* target_surface_mask_layer);
gfx::Rect TrackDamageFromLeftoverRects();
void PrepareRectHistoryForUpdate();
// These helper functions are used only in TrackDamageFromActiveLayers().
void ExtendDamageForLayer(LayerImpl* layer, gfx::Rect* target_damage_rect);
void ExtendDamageForRenderSurface(LayerImpl* layer,
gfx::Rect* target_damage_rect);
struct RectMapData {
RectMapData() : layer_id_(0), mailboxId_(0) {}
explicit RectMapData(int layer_id) : layer_id_(layer_id), mailboxId_(0) {}
void Update(const gfx::Rect& rect, unsigned int mailboxId) {
mailboxId_ = mailboxId;
rect_ = rect;
}
bool operator < (const RectMapData& other) const {
return layer_id_ < other.layer_id_;
}
int layer_id_;
unsigned int mailboxId_;
gfx::Rect rect_;
};
typedef std::vector<RectMapData> SortedRectMap;
RectMapData& RectDataForLayer(int layer_id, bool* layer_is_new);
SortedRectMap rect_history_;
unsigned int mailboxId_;
gfx::Rect current_damage_rect_;
DISALLOW_COPY_AND_ASSIGN(DamageTracker);
};
} // namespace cc
#endif // CC_TREES_DAMAGE_TRACKER_H_
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