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 texture_target,
  34               unsigned int internalformat,
  35               GLHelper* gl_helper,
  36               BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager,
  37               int surface_id);
  38   virtual ~BufferQueue();
  39
  40   void Initialize();
  41
  42   void BindFramebuffer();
  43   void SwapBuffers(const gfx::Rect& damage);
  44   void PageFlipComplete();
  45   void Reshape(const gfx::Size& size, float scale_factor);
  46
  47   void RecreateBuffers();
  48
  49   unsigned int current_texture_id() const { return current_surface_.texture; }
  50   unsigned int fbo() const { return fbo_; }
  51
  52  private:
  53   friend class BufferQueueTest;
  54
  55   struct AllocatedSurface {
  56     AllocatedSurface() : texture(0), image(0) {}
  57     AllocatedSurface(unsigned int texture,
  58                      unsigned int image,
  59                      const gfx::Rect& rect)
  60         : texture(texture), image(image), damage(rect) {}
  61     unsigned int texture;
  62     unsigned int image;
  63     gfx::Rect damage;  // This is the damage for this frame from the previous.
  64   };
  65
  66   void FreeAllSurfaces();
  67
  68   void FreeSurface(AllocatedSurface* surface);
  69
  70   // Copy everything that is in |copy_rect|, except for what is in
  71   // |exclude_rect| from |source_texture| to |texture|.
  72   virtual void CopyBufferDamage(int texture,
  73                                 int source_texture,
  74                                 const gfx::Rect& new_damage,
  75                                 const gfx::Rect& old_damage);
  76
  77   void UpdateBufferDamage(const gfx::Rect& damage);
  78
  79   // Return a surface, available to be drawn into.
  80   AllocatedSurface GetNextSurface();
  81
  82   AllocatedSurface RecreateBuffer(AllocatedSurface* surface);
  83
  84   gfx::Size size_;
  85   scoped_refptr<cc::ContextProvider> context_provider_;
  86   unsigned int fbo_;
  87   size_t allocated_count_;
  88   unsigned int texture_target_;
  89   unsigned int internal_format_;
  90   AllocatedSurface current_surface_;  // This surface is currently bound.
  91   AllocatedSurface displayed_surface_;  // The surface currently on the screen.
  92   std::vector<AllocatedSurface> available_surfaces_;  // These are free for use.
  93   std::deque<AllocatedSurface> in_flight_surfaces_;
  94   GLHelper* gl_helper_;
  95   BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager_;
  96   int surface_id_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(BufferQueue);
  99 };
 100
 101 }  // namespace content
 102
 103 #endif  // CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_