cc/surfaces/surface_id_allocator.cc

// Copyright 2014 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/surfaces/surface_id_allocator.h"

#include "cc/surfaces/surface_manager.h"

namespace cc {

SurfaceIdAllocator::SurfaceIdAllocator(uint32_t id_namespace)
    : id_namespace_(id_namespace), next_id_(1u), manager_(nullptr) {
}

void SurfaceIdAllocator::RegisterSurfaceIdNamespace(SurfaceManager* manager) {
  DCHECK(!manager_);
  manager_ = manager;
  manager_->RegisterSurfaceIdNamespace(id_namespace_);
}

SurfaceIdAllocator::~SurfaceIdAllocator() {
  if (manager_)
    manager_->InvalidateSurfaceIdNamespace(id_namespace_);
}

SurfaceId SurfaceIdAllocator::GenerateId() {
  SurfaceId id(static_cast<uint64_t>(id_namespace_) << 32 | next_id_);
  next_id_++;
  return id;
}

// static
uint32_t SurfaceIdAllocator::NamespaceForId(SurfaceId id) {
  return id.id >> 32;
}

}  // namespace cc