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// Copyright 2013 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_LAYERS_DELEGATED_FRAME_PROVIDER_H_
#define CC_LAYERS_DELEGATED_FRAME_PROVIDER_H_
#include <vector>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "cc/base/cc_export.h"
#include "cc/resources/return_callback.h"
#include "cc/resources/returned_resource.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
namespace cc {
class DelegatedFrameData;
class DelegatedFrameResourceCollection;
class DelegatedRendererLayer;
// Only one observing layer has ownership of the DelegatedFrameProvider. Only
// the active observer should call GetFrameDataAndRefResources(). All frames
// provided by a single DelegatedFrameProvider must have the same size. A new
// provider must be used for frames of a different size.
class CC_EXPORT DelegatedFrameProvider
: public base::RefCounted<DelegatedFrameProvider> {
public:
explicit DelegatedFrameProvider(
const scoped_refptr<DelegatedFrameResourceCollection>&
resource_collection,
scoped_ptr<DelegatedFrameData> frame);
void AddObserver(DelegatedRendererLayer* layer);
void RemoveObserver(DelegatedRendererLayer* layer);
void SetFrameData(scoped_ptr<DelegatedFrameData> frame);
// The DelegatedFrameData returned here must be displayed in order to not
// lose track of damage.
DelegatedFrameData* GetFrameDataAndRefResources(
DelegatedRendererLayer* observer,
gfx::Rect* damage);
ReturnCallback GetReturnResourcesCallbackForImplThread();
void UnrefResourcesOnMainThread(const ReturnedResourceArray& unused);
gfx::Size frame_size() const { return frame_size_; }
private:
friend class base::RefCounted<DelegatedFrameProvider>;
~DelegatedFrameProvider();
scoped_refptr<DelegatedFrameResourceCollection> resource_collection_;
scoped_ptr<DelegatedFrameData> frame_;
struct Observer {
DelegatedRendererLayer* layer;
gfx::Rect damage;
Observer(DelegatedRendererLayer* layer, const gfx::Rect& damage)
: layer(layer), damage(damage) {}
};
std::vector<Observer> observers_;
gfx::Size frame_size_;
DISALLOW_COPY_AND_ASSIGN(DelegatedFrameProvider);
};
} // namespace cc
#endif // CC_LAYERS_DELEGATED_FRAME_PROVIDER_H_