Mac: Remove dead IOSurface code

ui/surface/accelerated_surface_mac.h

-// Copyright (c) 2012 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 UI_SURFACE_ACCELERATED_SURFACE_MAC_H_
-#define UI_SURFACE_ACCELERATED_SURFACE_MAC_H_
-
-#include <CoreFoundation/CoreFoundation.h>
-#include <IOSurface/IOSurface.h>
-#include <stdint.h>
-
-#include "base/callback.h"
-#include "base/mac/scoped_cftyperef.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/gfx/geometry/size.h"
-#include "ui/gl/gl_context.h"
-#include "ui/gl/gl_surface.h"
-#include "ui/gl/gpu_preference.h"
-#include "ui/surface/surface_export.h"
-
-// Should not include GL headers in a header file. Forward declare these types
-// instead.
-typedef struct _CGLContextObject* CGLContextObj;
-typedef unsigned int GLenum;
-typedef unsigned int GLuint;
-
-namespace gfx {
-class Rect;
-}
-
-// Encapsulates an accelerated GL surface that can be shared across processes
-// on systems that support it (10.6 and above).
-
-class SURFACE_EXPORT AcceleratedSurface {
- public:
-  AcceleratedSurface();
-  virtual ~AcceleratedSurface();
-
-  // Set up internal buffers. |share_context|, if non-NULL, is a context
-  // with which the internally created OpenGL context shares textures and
-  // other resources. |allocate_fbo| indicates whether or not this surface
-  // should allocate an offscreen frame buffer object (FBO) internally. If
-  // not, then the user is expected to allocate one. NOTE that allocating
-  // an FBO internally does NOT work properly with client code which uses
-  // OpenGL (i.e., via GLES2 command buffers), because the GLES2
-  // implementation does not know to bind the accelerated surface's
-  // internal FBO when the default FBO is bound. |gpu_preference| indicates
-  // the GPU preference for the internally allocated GLContext. If
-  // |share_context| is non-NULL, then on platforms supporting dual GPUs,
-  // its GPU preference must match the passed one. Returns false upon
-  // failure.
-  bool Initialize(gfx::GLContext* share_context,
-                  bool allocate_fbo,
-                  gfx::GpuPreference gpu_preference);
-  // Tear down. Must be called before destructor to prevent leaks.
-  void Destroy();
-
-  // These methods are used only once the accelerated surface is initialized.
-
-  // Sets the accelerated surface to the given size, creating a new one if
-  // the height or width changes. Returns a unique id of the IOSurface to
-  // which the surface is bound, or 0 if no changes were made or an error
-  // occurred. MakeCurrent() will have been called on the new surface.
-  uint32_t SetSurfaceSize(const gfx::Size& size);
-
-  // Returns the id of this surface's IOSurface.
-  uint32_t GetSurfaceId();
-
-  // Sets the GL context to be the current one for drawing. Returns true if
-  // it succeeded.
-  bool MakeCurrent();
-  // Clear the surface to be transparent. Assumes the caller has already called
-  // MakeCurrent().
-  void Clear(const gfx::Rect& rect);
-  // Call after making changes to the surface which require a visual update.
-  // Makes the rendering show up in other processes. Assumes the caller has
-  // already called MakeCurrent().
-  //
-  // If this AcceleratedSurface is configured with its own FBO, then
-  // this call causes the color buffer to be transmitted. Otherwise,
-  // it causes the frame buffer of the current GL context to be copied
-  // into an internal texture via glCopyTexSubImage2D.
-  //
-  // The size of the rectangle copied is the size last specified via
-  // SetSurfaceSize.  If another GL context than the one this
-  // AcceleratedSurface contains is responsible for the production of
-  // the pixels, then when this entry point is called, the color
-  // buffer must be in a state where a glCopyTexSubImage2D is
-  // legal. (For example, if using multisampled FBOs, the FBO must
-  // have been resolved into a non-multisampled color texture.)
-  // Additionally, in this situation, the contexts must share
-  // server-side GL objects, so that this AcceleratedSurface's texture
-  // is a legal name in the namespace of the current context.
-  void SwapBuffers();
-
-  CGLContextObj context() {
-    return static_cast<CGLContextObj>(gl_context_->GetHandle());
-  }
-
-  // Get the accelerated surface size.
-  gfx::Size GetSize() const { return surface_size_; }
-
- private:
-  // Helper function to generate names for the backing texture and FBO.  On
-  // return, the resulting names can be attached to |fbo_|.  |target| is
-  // the target type for the color buffer.
-  void AllocateRenderBuffers(GLenum target, const gfx::Size& size);
-
-  // Helper function to attach the buffers previously allocated by a call to
-  // AllocateRenderBuffers().  On return, |fbo_| can be used for
-  // rendering.  |target| must be the same value as used in the call to
-  // AllocateRenderBuffers().  Returns |true| if the resulting framebuffer
-  // object is valid.
-  bool SetupFrameBufferObject(GLenum target);
-
-  gfx::Size ClampToValidDimensions(const gfx::Size& size);
-
-  // The OpenGL context, and pbuffer drawable, used to transfer data
-  // to the shared region (IOSurface).
-  scoped_refptr<gfx::GLSurface> gl_surface_;
-  scoped_refptr<gfx::GLContext> gl_context_;
-  base::ScopedCFTypeRef<IOSurfaceRef> io_surface_;
-
-  // The id of |io_surface_| or 0 if that's NULL.
-  uint32_t io_surface_id_;
-
-  gfx::Size surface_size_;
-  // It's important to avoid allocating zero-width or zero-height
-  // IOSurfaces and textures on the Mac, so we clamp each to a minimum
-  // of 1. This is the real size of the surface; surface_size_ is what
-  // the user requested.
-  gfx::Size real_surface_size_;
-  // TODO(kbr): the FBO management should not be in this class at all.
-  // However, if it is factored out, care needs to be taken to not
-  // introduce another copy of the color data on the GPU; the direct
-  // binding of the internal texture to the IOSurface saves a copy.
-  bool allocate_fbo_;
-  // This texture object is always allocated, regardless of whether
-  // the user requests an FBO be allocated.
-  GLuint texture_;
-  // The FBO and renderbuffer are only allocated if allocate_fbo_ is
-  // true.
-  GLuint fbo_;
-};
-
-#endif  // UI_SURFACE_ACCELERATED_SURFACE_MAC_H_