cc/layers/delegated_frame_provider.h

   1 // Copyright 2013 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_LAYERS_DELEGATED_FRAME_PROVIDER_H_
   6 #define CC_LAYERS_DELEGATED_FRAME_PROVIDER_H_
   7
   8 #include <vector>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "cc/base/cc_export.h"
  13 #include "cc/resources/return_callback.h"
  14 #include "cc/resources/returned_resource.h"
  15 #include "ui/gfx/rect_f.h"
  16 #include "ui/gfx/size.h"
  17
  18 namespace cc {
  19 class DelegatedFrameData;
  20 class DelegatedFrameResourceCollection;
  21 class DelegatedRendererLayer;
  22
  23 // Only one observing layer has ownership of the DelegatedFrameProvider. Only
  24 // the active observer should call GetFrameDataAndRefResources(). All frames
  25 // provided by a single DelegatedFrameProvider must have the same size. A new
  26 // provider must be used for frames of a different size.
  27 class CC_EXPORT DelegatedFrameProvider
  28     : public base::RefCounted<DelegatedFrameProvider> {
  29  public:
  30   explicit DelegatedFrameProvider(
  31       const scoped_refptr<DelegatedFrameResourceCollection>&
  32           resource_collection,
  33       scoped_ptr<DelegatedFrameData> frame);
  34
  35   void AddObserver(DelegatedRendererLayer* layer);
  36   void RemoveObserver(DelegatedRendererLayer* layer);
  37
  38   void SetFrameData(scoped_ptr<DelegatedFrameData> frame);
  39
  40   // The DelegatedFrameData returned here must be displayed in order to not
  41   // lose track of damage.
  42   DelegatedFrameData* GetFrameDataAndRefResources(
  43       DelegatedRendererLayer* observer,
  44       gfx::RectF* damage);
  45
  46   ReturnCallback GetReturnResourcesCallbackForImplThread();
  47   void UnrefResourcesOnMainThread(const ReturnedResourceArray& unused);
  48
  49   gfx::Size frame_size() const { return frame_size_; }
  50
  51  private:
  52   friend class base::RefCounted<DelegatedFrameProvider>;
  53   ~DelegatedFrameProvider();
  54
  55   scoped_refptr<DelegatedFrameResourceCollection> resource_collection_;
  56
  57   scoped_ptr<DelegatedFrameData> frame_;
  58
  59   struct Observer {
  60     DelegatedRendererLayer* layer;
  61     gfx::RectF damage;
  62
  63     Observer(DelegatedRendererLayer* layer, const gfx::RectF& damage)
  64         : layer(layer), damage(damage) {}
  65   };
  66   std::vector<Observer> observers_;
  67
  68   gfx::Size frame_size_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameProvider);
  71 };
  72
  73 }  // namespace cc
  74
  75 #endif  // CC_LAYERS_DELEGATED_FRAME_PROVIDER_H_