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      1 // Copyright 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CC_RESOURCES_LAYER_UPDATER_H_
      6 #define CC_RESOURCES_LAYER_UPDATER_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "cc/base/cc_export.h"
     11 #include "third_party/skia/include/core/SkColor.h"
     12 #include "ui/gfx/rect.h"
     13 #include "ui/gfx/vector2d.h"
     14 
     15 namespace cc {
     16 
     17 class PrioritizedResource;
     18 class PrioritizedResourceManager;
     19 class ResourceUpdateQueue;
     20 class TextureManager;
     21 
     22 class CC_EXPORT LayerUpdater : public base::RefCounted<LayerUpdater> {
     23  public:
     24   // Allows updaters to store per-resource update properties.
     25   class CC_EXPORT Resource {
     26    public:
     27     virtual ~Resource();
     28 
     29     PrioritizedResource* texture() { return texture_.get(); }
     30     // TODO(reveman): partial_update should be a property of this class
     31     // instead of an argument passed to Update().
     32     virtual void Update(ResourceUpdateQueue* queue,
     33                         const gfx::Rect& source_rect,
     34                         const gfx::Vector2d& dest_offset,
     35                         bool partial_update) = 0;
     36 
     37    protected:
     38     explicit Resource(scoped_ptr<PrioritizedResource> texture);
     39 
     40    private:
     41     scoped_ptr<PrioritizedResource> texture_;
     42 
     43     DISALLOW_COPY_AND_ASSIGN(Resource);
     44   };
     45 
     46   LayerUpdater() {}
     47 
     48   virtual scoped_ptr<Resource> CreateResource(
     49       PrioritizedResourceManager* manager) = 0;
     50   virtual void PrepareToUpdate(const gfx::Size& content_size,
     51                                const gfx::Rect& paint_rect,
     52                                const gfx::Size& tile_size,
     53                                float contents_width_scale,
     54                                float contents_height_scale) {}
     55   virtual void ReduceMemoryUsage() {}
     56 
     57   // Set true by the layer when it is known that the entire output is going to
     58   // be opaque.
     59   virtual void SetOpaque(bool opaque) {}
     60   // Set true by the layer when it is known that the entire output bounds will
     61   // be rasterized.
     62   virtual void SetFillsBoundsCompletely(bool fills_bounds) {}
     63   virtual void SetBackgroundColor(SkColor background_color) {}
     64 
     65  protected:
     66   virtual ~LayerUpdater() {}
     67 
     68  private:
     69   friend class base::RefCounted<LayerUpdater>;
     70 
     71   DISALLOW_COPY_AND_ASSIGN(LayerUpdater);
     72 };
     73 
     74 }  // namespace cc
     75 
     76 #endif  // CC_RESOURCES_LAYER_UPDATER_H_
     77