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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_BUFFERED_OUTPUT_SURFACE_H_
#define CONTENT_BROWSER_COMPOSITOR_BUFFERED_OUTPUT_SURFACE_H_
#include <queue>
#include <vector>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/common/content_export.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
namespace cc {
class ContextProvider;
}
namespace content {
class BrowserGpuMemoryBufferManager;
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 internalformat,
GLHelper* gl_helper,
BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager,
int surface_id);
virtual ~BufferQueue();
bool Initialize();
void BindFramebuffer();
void SwapBuffers(const gfx::Rect& damage);
void PageFlipComplete();
void Reshape(const gfx::Size& size, float scale_factor);
unsigned int current_texture_id() { return current_surface_.texture; }
private:
friend class BufferQueueTest;
struct AllocatedSurface {
AllocatedSurface() : texture(0), image(0) {}
AllocatedSurface(unsigned int texture,
unsigned int image,
const gfx::Rect& rect)
: texture(texture), image(image), damage(rect) {}
unsigned int texture;
unsigned int image;
gfx::Rect damage; // This is the damage for this frame from the previous.
};
void FreeAllSurfaces();
void FreeSurface(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.
AllocatedSurface GetNextSurface();
gfx::Size size_;
scoped_refptr<cc::ContextProvider> context_provider_;
unsigned int fbo_;
size_t allocated_count_;
unsigned int internalformat_;
AllocatedSurface current_surface_; // This surface is currently bound.
std::vector<AllocatedSurface> available_surfaces_; // These are free for use.
std::deque<AllocatedSurface> in_flight_surfaces_;
GLHelper* gl_helper_;
BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager_;
int surface_id_;
DISALLOW_COPY_AND_ASSIGN(BufferQueue);
};
} // namespace content
#endif // CONTENT_BROWSER_COMPOSITOR_BUFFERED_OUTPUT_SURFACE_H_
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