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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 <memory>
#include <vector>
#include "base/macros.h"
#include "cc/base/cc_export.h"
#include "cc/layers/layer_collections.h"
#include "ui/gfx/geometry/rect.h"
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 std::unique_ptr<DamageTracker> Create();
~DamageTracker();
void DidDrawDamagedArea() { current_damage_ = DamageAccumulator(); }
void AddDamageNextUpdate(const gfx::Rect& dmg) { current_damage_.Union(dmg); }
void UpdateDamageTrackingState(
const LayerImplList& layer_list,
const RenderSurfaceImpl* target_surface,
bool target_surface_property_changed_only_from_descendant,
const gfx::Rect& target_surface_content_rect,
LayerImpl* target_surface_mask_layer,
const FilterOperations& filters);
bool GetDamageRectIfValid(gfx::Rect* rect);
private:
DamageTracker();
class DamageAccumulator {
public:
template <typename Type>
void Union(const Type& rect) {
if (!is_valid_rect_)
return;
if (rect.IsEmpty())
return;
if (IsEmpty()) {
x_ = rect.x();
y_ = rect.y();
right_ = rect.right();
bottom_ = rect.bottom();
return;
}
x_ = std::min(x_, rect.x());
y_ = std::min(y_, rect.y());
right_ = std::max(right_, rect.right());
bottom_ = std::max(bottom_, rect.bottom());
}
int x() const { return x_; }
int y() const { return y_; }
int right() const { return right_; }
int bottom() const { return bottom_; }
bool IsEmpty() const { return x_ == right_ || y_ == bottom_; }
bool GetAsRect(gfx::Rect* rect);
private:
bool is_valid_rect_ = true;
int x_ = 0;
int y_ = 0;
int right_ = 0;
int bottom_ = 0;
};
DamageAccumulator TrackDamageFromActiveLayers(
const LayerImplList& layer_list,
const RenderSurfaceImpl* target_surface);
DamageAccumulator TrackDamageFromSurfaceMask(
LayerImpl* target_surface_mask_layer);
DamageAccumulator TrackDamageFromLeftoverRects();
void PrepareRectHistoryForUpdate();
// These helper functions are used only in TrackDamageFromActiveLayers().
void ExtendDamageForLayer(LayerImpl* layer, DamageAccumulator* target_damage);
void ExtendDamageForRenderSurface(RenderSurfaceImpl* render_surface,
DamageAccumulator* target_damage);
void ExpandDamageInsideRectWithFilters(const gfx::Rect& pre_filter_rect,
const FilterOperations& filters,
DamageAccumulator* damage);
struct LayerRectMapData {
LayerRectMapData() : layer_id_(0), mailboxId_(0) {}
explicit LayerRectMapData(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 LayerRectMapData& other) const {
return layer_id_ < other.layer_id_;
}
int layer_id_;
unsigned int mailboxId_;
gfx::Rect rect_;
};
struct SurfaceRectMapData {
SurfaceRectMapData() : surface_id_(0), mailboxId_(0) {}
explicit SurfaceRectMapData(int surface_id)
: surface_id_(surface_id), mailboxId_(0) {}
void Update(const gfx::Rect& rect, unsigned int mailboxId) {
mailboxId_ = mailboxId;
rect_ = rect;
}
bool operator<(const SurfaceRectMapData& other) const {
return surface_id_ < other.surface_id_;
}
int surface_id_;
unsigned int mailboxId_;
gfx::Rect rect_;
};
typedef std::vector<LayerRectMapData> SortedRectMapForLayers;
typedef std::vector<SurfaceRectMapData> SortedRectMapForSurfaces;
LayerRectMapData& RectDataForLayer(int layer_id, bool* layer_is_new);
SurfaceRectMapData& RectDataForSurface(int layer_id, bool* layer_is_new);
SortedRectMapForLayers rect_history_for_layers_;
SortedRectMapForSurfaces rect_history_for_surfaces_;
unsigned int mailboxId_;
DamageAccumulator current_damage_;
DISALLOW_COPY_AND_ASSIGN(DamageTracker);
};
} // namespace cc
#endif // CC_TREES_DAMAGE_TRACKER_H_
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