gpu: Compositor management of GpuMemoryBuffer instances.

gpu/command_buffer/client/gpu_memory_buffer_tracker.cc

-// Copyright (c) 2013 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 "gpu/command_buffer/client/gpu_memory_buffer_tracker.h"
-
-#include "base/memory/scoped_ptr.h"
-#include "gpu/command_buffer/client/gles2_implementation.h"
-#include "gpu/command_buffer/client/gpu_control.h"
-
-namespace gpu {
-namespace gles2 {
-
-GpuMemoryBufferTracker::GpuMemoryBufferTracker(GpuControl* gpu_control)
-    : gpu_control_(gpu_control) {
-}
-
-GpuMemoryBufferTracker::~GpuMemoryBufferTracker() {
-  while (!buffers_.empty()) {
-    RemoveBuffer(buffers_.begin()->first);
-  }
-}
-
-int32 GpuMemoryBufferTracker::CreateBuffer(size_t width,
-                                           size_t height,
-                                           int32 internalformat,
-                                           int32 usage) {
-  int32 image_id = 0;
-  DCHECK(gpu_control_);
-  gfx::GpuMemoryBuffer* buffer = gpu_control_->CreateGpuMemoryBuffer(
-      width, height, internalformat, usage, &image_id);
-  if (!buffer)
-    return 0;
-
-  std::pair<BufferMap::iterator, bool> result =
-      buffers_.insert(std::make_pair(image_id, buffer));
-  DCHECK(result.second);
-
-  return image_id;
-}
-
-gfx::GpuMemoryBuffer* GpuMemoryBufferTracker::GetBuffer(int32 image_id) {
-  BufferMap::iterator it = buffers_.find(image_id);
-  return (it != buffers_.end()) ? it->second : NULL;
-}
-
-void GpuMemoryBufferTracker::RemoveBuffer(int32 image_id) {
-  BufferMap::iterator buffer_it = buffers_.find(image_id);
-  if (buffer_it != buffers_.end())
-    buffers_.erase(buffer_it);
-  DCHECK(gpu_control_);
-  gpu_control_->DestroyGpuMemoryBuffer(image_id);
-}
-
-}  // namespace gles2
-}  // namespace gpu