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 #include "cc/surfaces/surface_manager.h"
   8
   9 namespace cc {
  10
  11 SurfaceIdAllocator::SurfaceIdAllocator(uint32_t id_namespace)
  12     : id_namespace_(id_namespace), next_id_(1u), manager_(nullptr) {
  13 }
  14
  15 void SurfaceIdAllocator::RegisterSurfaceIdNamespace(SurfaceManager* manager) {
  16   DCHECK(!manager_);
  17   manager_ = manager;
  18   manager_->RegisterSurfaceIdNamespace(id_namespace_);
  19 }
  20
  21 SurfaceIdAllocator::~SurfaceIdAllocator() {
  22   if (manager_)
  23     manager_->InvalidateSurfaceIdNamespace(id_namespace_);
  24 }
  25
  26 SurfaceId SurfaceIdAllocator::GenerateId() {
  27   SurfaceId id(static_cast<uint64_t>(id_namespace_) << 32 | next_id_);
  28   next_id_++;
  29   return id;
  30 }
  31
  32 // static
  33 uint32_t SurfaceIdAllocator::NamespaceForId(SurfaceId id) {
  34   return id.id >> 32;
  35 }
  36
  37 }  // namespace cc