// 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 "gpu/command_buffer/service/image_manager.h"

#include "ui/gl/gl_image.h"

namespace gpu {
namespace gles2 {

ImageManager::ImageManager() : release_after_use_(false) {
}

ImageManager::~ImageManager() {
}

bool ImageManager::RegisterGpuMemoryBuffer(int32 id,
                                           gfx::GpuMemoryBufferHandle buffer,
                                           size_t width,
                                           size_t height,
                                           unsigned internalformat) {
  if (id <= 0) {
    DVLOG(0) << "Cannot register GPU memory buffer with non-positive ID.";
    return false;
  }

  if (LookupImage(id)) {
    DVLOG(0) << "GPU memory buffer ID already in use.";
    return false;
  }

  scoped_refptr<gfx::GLImage> gl_image =
      gfx::GLImage::CreateGLImageForGpuMemoryBuffer(buffer,
                                                    gfx::Size(width, height),
                                                    internalformat);
  if (!gl_image)
    return false;

  if (release_after_use_)
    gl_image->SetReleaseAfterUse();

  AddImage(gl_image.get(), id);
  return true;
}

void ImageManager::DestroyGpuMemoryBuffer(int32 id) {
  RemoveImage(id);
}

void ImageManager::AddImage(gfx::GLImage* image, int32 service_id) {
  gl_images_[service_id] = image;
}

void ImageManager::RemoveImage(int32 service_id) {
  gl_images_.erase(service_id);
}

gfx::GLImage* ImageManager::LookupImage(int32 service_id) {
  GLImageMap::const_iterator iter = gl_images_.find(service_id);
  if (iter != gl_images_.end())
    return iter->second.get();

  return NULL;
}

void ImageManager::SetReleaseAfterUse() {
  release_after_use_ = true;
}

}  // namespace gles2
}  // namespace gpu