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// Copyright 2014 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 CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_
#define CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_
#include <stddef.h>
#include <deque>
#include <memory>
#include <vector>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
namespace cc {
class ContextProvider;
}
namespace gfx {
class GpuMemoryBuffer;
}
namespace gpu {
class GpuMemoryBufferManager;
}
namespace content {
class GLHelper;
// Provides a surface that manages its own buffers, backed by GpuMemoryBuffers
// created using CHROMIUM_gpu_memory_buffer_image. Double/triple buffering is
// implemented internally. Doublebuffering occurs if PageFlipComplete is called
// before the next BindFramebuffer call, otherwise it creates extra buffers.
class CONTENT_EXPORT BufferQueue {
public:
BufferQueue(scoped_refptr<cc::ContextProvider> context_provider,
unsigned int texture_target,
unsigned int internalformat,
GLHelper* gl_helper,
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
int surface_id);
virtual ~BufferQueue();
void Initialize();
void BindFramebuffer();
void SwapBuffers(const gfx::Rect& damage);
void PageFlipComplete();
void Reshape(const gfx::Size& size, float scale_factor);
void RecreateBuffers();
unsigned int current_texture_id() const {
return current_surface_ ? current_surface_->texture : 0;
}
unsigned int fbo() const { return fbo_; }
private:
friend class BufferQueueTest;
friend class AllocatedSurface;
struct CONTENT_EXPORT AllocatedSurface {
AllocatedSurface(BufferQueue* buffer_queue,
std::unique_ptr<gfx::GpuMemoryBuffer> buffer,
unsigned int texture,
unsigned int image,
const gfx::Rect& rect);
~AllocatedSurface();
BufferQueue* const buffer_queue;
std::unique_ptr<gfx::GpuMemoryBuffer> buffer;
const unsigned int texture;
const unsigned int image;
gfx::Rect damage; // This is the damage for this frame from the previous.
};
void FreeAllSurfaces();
void FreeSurfaceResources(AllocatedSurface* surface);
// Copy everything that is in |copy_rect|, except for what is in
// |exclude_rect| from |source_texture| to |texture|.
virtual void CopyBufferDamage(int texture,
int source_texture,
const gfx::Rect& new_damage,
const gfx::Rect& old_damage);
void UpdateBufferDamage(const gfx::Rect& damage);
// Return a surface, available to be drawn into.
std::unique_ptr<AllocatedSurface> GetNextSurface();
std::unique_ptr<AllocatedSurface> RecreateBuffer(
std::unique_ptr<AllocatedSurface> surface);
gfx::Size size_;
scoped_refptr<cc::ContextProvider> context_provider_;
unsigned int fbo_;
size_t allocated_count_;
unsigned int texture_target_;
unsigned int internal_format_;
// This surface is currently bound. This may be nullptr if no surface has
// been bound, or if allocation failed at bind.
std::unique_ptr<AllocatedSurface> current_surface_;
// The surface currently on the screen, if any.
std::unique_ptr<AllocatedSurface> displayed_surface_;
// These are free for use, and are not nullptr.
std::vector<std::unique_ptr<AllocatedSurface>> available_surfaces_;
// These have been swapped but are not displayed yet. Entries of this deque
// may be nullptr, if they represent frames that have been destroyed.
std::deque<std::unique_ptr<AllocatedSurface>> in_flight_surfaces_;
GLHelper* gl_helper_;
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
int surface_id_;
DISALLOW_COPY_AND_ASSIGN(BufferQueue);
};
} // namespace content
#endif // CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_