content/browser/compositor/buffer_queue.h

   1 // Copyright 2014 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 CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_
   6 #define CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_
   7
   8 #include <queue>
   9 #include <vector>
  10
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "content/common/content_export.h"
  14 #include "ui/gfx/geometry/rect.h"
  15 #include "ui/gfx/geometry/size.h"
  16
  17 namespace cc {
  18 class ContextProvider;
  19 }
  20
  21 namespace content {
  22
  23 class BrowserGpuMemoryBufferManager;
  24 class GLHelper;
  25
  26 // Provides a surface that manages its own buffers, backed by GpuMemoryBuffers
  27 // created using CHROMIUM_gpu_memory_buffer_image. Double/triple buffering is
  28 // implemented internally. Doublebuffering occurs if PageFlipComplete is called
  29 // before the next BindFramebuffer call, otherwise it creates extra buffers.
  30 class CONTENT_EXPORT BufferQueue {
  31  public:
  32   BufferQueue(scoped_refptr<cc::ContextProvider> context_provider,
  33               unsigned int internalformat,
  34               GLHelper* gl_helper,
  35               BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager,
  36               int surface_id);
  37   virtual ~BufferQueue();
  38
  39   void Initialize();
  40
  41   void BindFramebuffer();
  42   void SwapBuffers(const gfx::Rect& damage);
  43   void PageFlipComplete();
  44   void Reshape(const gfx::Size& size, float scale_factor);
  45
  46   unsigned int current_texture_id() const { return current_surface_.texture; }
  47   unsigned int fbo() const { return fbo_; }
  48
  49  private:
  50   friend class BufferQueueTest;
  51
  52   struct AllocatedSurface {
  53     AllocatedSurface() : texture(0), image(0) {}
  54     AllocatedSurface(unsigned int texture,
  55                      unsigned int image,
  56                      const gfx::Rect& rect)
  57         : texture(texture), image(image), damage(rect) {}
  58     unsigned int texture;
  59     unsigned int image;
  60     gfx::Rect damage;  // This is the damage for this frame from the previous.
  61   };
  62
  63   void FreeAllSurfaces();
  64
  65   void FreeSurface(AllocatedSurface* surface);
  66
  67   // Copy everything that is in |copy_rect|, except for what is in
  68   // |exclude_rect| from |source_texture| to |texture|.
  69   virtual void CopyBufferDamage(int texture,
  70                                 int source_texture,
  71                                 const gfx::Rect& new_damage,
  72                                 const gfx::Rect& old_damage);
  73
  74   void UpdateBufferDamage(const gfx::Rect& damage);
  75
  76   // Return a surface, available to be drawn into.
  77   AllocatedSurface GetNextSurface();
  78
  79   gfx::Size size_;
  80   scoped_refptr<cc::ContextProvider> context_provider_;
  81   unsigned int fbo_;
  82   size_t allocated_count_;
  83   unsigned int internalformat_;
  84   AllocatedSurface current_surface_;  // This surface is currently bound.
  85   std::vector<AllocatedSurface> available_surfaces_;  // These are free for use.
  86   std::deque<AllocatedSurface> in_flight_surfaces_;
  87   GLHelper* gl_helper_;
  88   BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager_;
  89   int surface_id_;
  90
  91   DISALLOW_COPY_AND_ASSIGN(BufferQueue);
  92 };
  93
  94 }  // namespace content
  95
  96 #endif  // CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_