Move ScopedPixelBuffer out of VideoFrameCapturer implementation for Mac.

remoting/host/mac/scoped_pixel_buffer_object.cc

+// 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.
+
+#include "remoting/host/mac/scoped_pixel_buffer_object.h"
+
+namespace remoting {
+
+ScopedPixelBufferObject::ScopedPixelBufferObject()
+    : cgl_context_(NULL),
+      pixel_buffer_object_(0) {
+}
+
+ScopedPixelBufferObject::~ScopedPixelBufferObject() {
+  Release();
+}
+
+bool ScopedPixelBufferObject::Init(CGLContextObj cgl_context,
+                                      int size_in_bytes) {
+  cgl_context_ = cgl_context;
+  CGLContextObj CGL_MACRO_CONTEXT = cgl_context_;
+  glGenBuffersARB(1, &pixel_buffer_object_);
+  if (glGetError() == GL_NO_ERROR) {
+    glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, pixel_buffer_object_);
+    glBufferDataARB(GL_PIXEL_PACK_BUFFER_ARB, size_in_bytes, NULL,
+                    GL_STREAM_READ_ARB);
+    glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, 0);
+    if (glGetError() != GL_NO_ERROR) {
+      Release();
+    }
+  } else {
+    cgl_context_ = NULL;
+    pixel_buffer_object_ = 0;
+  }
+  return pixel_buffer_object_ != 0;
+}
+
+void ScopedPixelBufferObject::Release() {
+  if (pixel_buffer_object_) {
+    CGLContextObj CGL_MACRO_CONTEXT = cgl_context_;
+    glDeleteBuffersARB(1, &pixel_buffer_object_);
+    cgl_context_ = NULL;
+    pixel_buffer_object_ = 0;
+  }
+}
+
+} // namespace remoting