cc/surfaces/surface_id_allocator.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/surfaces/surface_id_allocator.h"
   6
   7 namespace cc {
   8
   9 SurfaceIdAllocator::SurfaceIdAllocator(uint32_t id_namespace)
  10     : id_namespace_(id_namespace), next_id_(1u) {
  11 }
  12
  13 SurfaceId SurfaceIdAllocator::GenerateId() {
  14   SurfaceId id(static_cast<uint64_t>(id_namespace_) << 32 | next_id_);
  15   next_id_++;
  16   return id;
  17 }
  18
  19 // static
  20 uint32_t SurfaceIdAllocator::NamespaceForId(SurfaceId id) {
  21   return id.id >> 32;
  22 }
  23
  24 }  // namespace cc