Mac: Always use surfaceless mode

content/common/gpu/image_transport_surface_fbo_mac.h

-// 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, const base::Closure& context_dirtied_callback,
-        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;
-
-    // Called when the frame size has changed (the buffer may not have been
-    // reallocated, since its size may be rounded).
-    virtual void FrameSizeChanged(
-        const gfx::Size& pixel_size, float scale_factor) = 0;
-
-    // Swap buffers, or post sub-buffer.
-    virtual void SwapBuffers(const gfx::Rect& dirty_rect) = 0;
-
-    // Indicate that the backbuffer will be written to.
-    virtual void WillWriteToBackbuffer() = 0;
-
-    // Indicate that the backbuffer has been discarded and should not be seen
-    // again.
-    virtual void DiscardBackbuffer() = 0;
-
-    // Called once for every SwapBuffers call when the IPC for the present has
-    // been processed by the browser. |disable_throttling| is set if the
-    // browser suspects that GPU back-pressure should be disabled.
-    virtual void SwapBuffersAckedByBrowser(bool disable_throttling) = 0;
-  };
-
-  ImageTransportSurfaceFBO(GpuChannelManager* manager,
-                           GpuCommandBufferStub* stub,
-                           gfx::PluginWindowHandle handle);
-
-  // GLSurface implementation
-  bool Initialize() override;
-  void Destroy() override;
-  bool DeferDraws() override;
-  bool IsOffscreen() override;
-  gfx::SwapResult SwapBuffers() override;
-  gfx::SwapResult PostSubBuffer(int x, int y, int width, int height) override;
-  bool SupportsPostSubBuffer() override;
-  gfx::Size GetSize() override;
-  void* GetHandle() override;
-  void* GetDisplay() override;
-  bool OnMakeCurrent(gfx::GLContext* context) override;
-  void NotifyWasBound() override;
-  unsigned int GetBackingFrameBufferObject() override;
-  bool SetBackbufferAllocation(bool allocated) override;
-  void SetFrontbufferAllocation(bool allocated) override;
-
-  // Called when the context may continue to make forward progress after a swap.
-  void SendSwapBuffers(uint64 surface_handle,
-                       const gfx::Size pixel_size,
-                       float scale_factor);
-  void SetRendererID(int renderer_id);
-
-  const gpu::gles2::FeatureInfo* GetFeatureInfo() const;
-
- protected:
-  // ImageTransportSurface implementation
-  void OnBufferPresented(
-      const AcceleratedSurfaceMsg_BufferPresented_Params& params) override;
-  void OnResize(gfx::Size pixel_size, float scale_factor) override;
-  void SetLatencyInfo(const std::vector<ui::LatencyInfo>&) override;
-
-  // GpuCommandBufferStub::DestructionObserver implementation.
-  void OnWillDestroyStub() override;
-
- private:
-  ~ImageTransportSurfaceFBO() override;
-
-  void AdjustBufferAllocation();
-  void DestroyFramebuffer();
-  void AllocateOrResizeFramebuffer(
-      const gfx::Size& pixel_size, float scale_factor);
-  bool SwapBuffersInternal(const gfx::Rect& dirty_rect);
-
-  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 pixel_size_;
-  gfx::Size rounded_pixel_size_;
-  float scale_factor_;
-
-  // Whether or not we've successfully made the surface current once.
-  bool made_current_;
-
-  // Whether a SwapBuffers IPC needs to be sent to the browser.
-  bool is_swap_buffers_send_pending_;
-  std::vector<ui::LatencyInfo> latency_info_;
-  gfx::Rect pending_swap_pixel_damage_rect_;
-
-  scoped_ptr<ImageTransportHelper> helper_;
-
-  DISALLOW_COPY_AND_ASSIGN(ImageTransportSurfaceFBO);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_