| // 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_ |