// Copyright 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 "cc/resources/texture_mailbox.h"

#include "base/logging.h"
#include "third_party/khronos/GLES2/gl2.h"

namespace cc {

TextureMailbox::TextureMailbox()
    : target_(GL_TEXTURE_2D),
      sync_point_(0),
      shared_memory_(NULL) {
}

TextureMailbox::TextureMailbox(
    const std::string& mailbox_name,
    const ReleaseCallback& callback)
    : callback_(callback),
      target_(GL_TEXTURE_2D),
      sync_point_(0),
      shared_memory_(NULL) {
  DCHECK(mailbox_name.empty() == callback.is_null());
  if (!mailbox_name.empty()) {
    CHECK(mailbox_name.size() == sizeof(name_.name));
    name_.SetName(reinterpret_cast<const int8*>(mailbox_name.data()));
  }
}

TextureMailbox::TextureMailbox(
    const gpu::Mailbox& mailbox_name,
    const ReleaseCallback& callback)
    : callback_(callback),
      target_(GL_TEXTURE_2D),
      sync_point_(0),
      shared_memory_(NULL) {
  DCHECK(mailbox_name.IsZero() == callback.is_null());
  name_.SetName(mailbox_name.name);
}

TextureMailbox::TextureMailbox(
    const gpu::Mailbox& mailbox_name,
    const ReleaseCallback& callback,
    unsigned sync_point)
    : callback_(callback),
      target_(GL_TEXTURE_2D),
      sync_point_(sync_point),
      shared_memory_(NULL) {
  DCHECK(mailbox_name.IsZero() == callback.is_null());
  name_.SetName(mailbox_name.name);
}

TextureMailbox::TextureMailbox(
    const gpu::Mailbox& mailbox_name,
    const ReleaseCallback& callback,
    unsigned texture_target,
    unsigned sync_point)
    : callback_(callback),
      target_(texture_target),
      sync_point_(sync_point),
      shared_memory_(NULL) {
  DCHECK(mailbox_name.IsZero() == callback.is_null());
  name_.SetName(mailbox_name.name);
}

TextureMailbox::TextureMailbox(
    base::SharedMemory* shared_memory,
    gfx::Size size,
    const ReleaseCallback& callback)
    : callback_(callback),
      target_(GL_TEXTURE_2D),
      sync_point_(0),
      shared_memory_(shared_memory),
      shared_memory_size_(size) {
}

TextureMailbox::~TextureMailbox() {
}

bool TextureMailbox::Equals(const TextureMailbox& other) const {
  if (other.IsTexture())
    return ContainsMailbox(other.name());
  else if (other.IsSharedMemory())
    return ContainsHandle(other.shared_memory_->handle());

  DCHECK(!other.IsValid());
  return !IsValid();
}

bool TextureMailbox::ContainsMailbox(const gpu::Mailbox& other) const {
  return IsTexture() && !memcmp(data(), other.name, sizeof(name_.name));
}

bool TextureMailbox::ContainsHandle(base::SharedMemoryHandle handle) const {
  return shared_memory_ && shared_memory_->handle() == handle;
}

void TextureMailbox::RunReleaseCallback(unsigned sync_point,
                                        bool lost_resource) const {
  if (!callback_.is_null())
    callback_.Run(sync_point, lost_resource);
}

void TextureMailbox::SetName(const gpu::Mailbox& other) {
  DCHECK(shared_memory_ == NULL);
  name_.SetName(other.name);
}

TextureMailbox TextureMailbox::CopyWithNewCallback(
    const ReleaseCallback& callback) const {
  TextureMailbox result(*this);
  result.callback_ = callback;
  return result;
}

size_t TextureMailbox::shared_memory_size_in_bytes() const {
  return 4 * shared_memory_size_.GetArea();
}

}  // namespace cc