cc/surfaces/surface_id_allocator.h

   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 #ifndef CC_SURFACES_SURFACE_ID_ALLOCATOR_H_
   6 #define CC_SURFACES_SURFACE_ID_ALLOCATOR_H_
   7
   8 #include "cc/surfaces/surface_id.h"
   9 #include "cc/surfaces/surfaces_export.h"
  10
  11 namespace cc {
  12
  13 // This is a helper class for generating surface IDs within a specified
  14 // namespace.  This is not threadsafe, to use from multiple threads wrap this
  15 // class in a mutex.
  16 class CC_SURFACES_EXPORT SurfaceIdAllocator {
  17  public:
  18   explicit SurfaceIdAllocator(uint32_t id_namespace);
  19
  20   SurfaceId GenerateId();
  21
  22   static uint32_t NamespaceForId(SurfaceId id);
  23
  24   uint32_t id_namespace() const { return id_namespace_; }
  25
  26  private:
  27   const uint32_t id_namespace_;
  28   uint32_t next_id_;
  29
  30   DISALLOW_COPY_AND_ASSIGN(SurfaceIdAllocator);
  31 };
  32
  33 }  // namespace cc
  34
  35 #endif  // CC_SURFACES_SURFACE_ID_ALLOCATOR_H_