text: // 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_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
  #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
  
  #include "base/mac/scoped_cftyperef.h"
  #include "base/memory/scoped_ptr.h"
  #include "content/common/gpu/gpu_command_buffer_stub.h"
  #include "content/common/gpu/image_transport_surface.h"
  #include "ui/gl/gl_bindings.h"
  
  namespace content {
  
  // We are backed by an offscreen surface for the purposes of creating
  // a context, but use FBOs to render to texture. The texture may be backed by
  // an IOSurface, or it may be presented to the screen via a CALayer, depending
  // on the StorageProvider class specified.
  class ImageTransportSurfaceFBO
      : public gfx::GLSurface,
        public ImageTransportSurface,
        public GpuCommandBufferStub::DestructionObserver {
   public:
    // The interface through which storage for the color buffer of the FBO is
    // allocated.
    class StorageProvider {
     public:
      virtual ~StorageProvider() {}
      // IOSurfaces cause too much address space fragmentation if they are
      // allocated on every resize. This gets a rounded size for allocation.
      virtual gfx::Size GetRoundedSize(gfx::Size size) = 0;
  
      // Allocate the storage for the color buffer. The specified context is
      // current, and there is a texture bound to GL_TEXTURE_RECTANGLE_ARB.
      virtual bool AllocateColorBufferStorage(
          CGLContextObj context, GLuint texture,
          gfx::Size size, float scale_factor) = 0;
  
      // Free the storage allocated in the AllocateColorBufferStorage call. The
      // GL texture that was bound has already been deleted by the caller.
      virtual void FreeColorBufferStorage() = 0;
  
      // Retrieve the handle for the surface to send to the browser process to
      // display.
      virtual uint64 GetSurfaceHandle() const = 0;
  
      // Called when a frame is about to be sent to the browser process.
      virtual void WillSwapBuffers() = 0;
    };
  
    ImageTransportSurfaceFBO(StorageProvider* storage_provider,
                             GpuChannelManager* manager,
                             GpuCommandBufferStub* stub,
                             gfx::PluginWindowHandle handle);
  
    // GLSurface implementation
    virtual bool Initialize() OVERRIDE;
    virtual void Destroy() OVERRIDE;
    virtual bool DeferDraws() OVERRIDE;
    virtual bool IsOffscreen() OVERRIDE;
    virtual bool SwapBuffers() OVERRIDE;
    virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
    virtual bool SupportsPostSubBuffer() OVERRIDE;
    virtual gfx::Size GetSize() OVERRIDE;
    virtual void* GetHandle() OVERRIDE;
    virtual void* GetDisplay() OVERRIDE;
    virtual bool OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
    virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
    virtual bool SetBackbufferAllocation(bool allocated) OVERRIDE;
    virtual void SetFrontbufferAllocation(bool allocated) OVERRIDE;
  
   protected:
    // ImageTransportSurface implementation
    virtual void OnBufferPresented(
        const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
    virtual void OnResize(gfx::Size size, float scale_factor) OVERRIDE;
    virtual void SetLatencyInfo(
        const std::vector<ui::LatencyInfo>&) OVERRIDE;
    virtual void WakeUpGpu() OVERRIDE;
  
    // GpuCommandBufferStub::DestructionObserver implementation.
    virtual void OnWillDestroyStub() OVERRIDE;
  
   private:
    virtual ~ImageTransportSurfaceFBO() OVERRIDE;
  
    void AdjustBufferAllocation();
    void DestroyFramebuffer();
    void CreateFramebuffer();
  
    scoped_ptr<StorageProvider> storage_provider_;
  
    // Tracks the current buffer allocation state.
    bool backbuffer_suggested_allocation_;
    bool frontbuffer_suggested_allocation_;
  
    uint32 fbo_id_;
    GLuint texture_id_;
    GLuint depth_stencil_renderbuffer_id_;
    bool has_complete_framebuffer_;
  
    // Weak pointer to the context that this was last made current to.
    gfx::GLContext* context_;
  
    gfx::Size size_;
    gfx::Size rounded_size_;
    float scale_factor_;
  
    // Whether or not we've successfully made the surface current once.
    bool made_current_;
  
    // Whether a SwapBuffers is pending.
    bool is_swap_buffers_pending_;
  
    // Whether we unscheduled command buffer because of pending SwapBuffers.
    bool did_unschedule_;
  
    std::vector<ui::LatencyInfo> latency_info_;
  
    scoped_ptr<ImageTransportHelper> helper_;
  
    DISALLOW_COPY_AND_ASSIGN(ImageTransportSurfaceFBO);
  };
  
  }  // namespace content
  
  #endif  //  CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_MAC_H_
  