cc/resources/scoped_ui_resource.h

   1 // Copyright 2013 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_RESOURCES_SCOPED_UI_RESOURCE_H_
   6 #define CC_RESOURCES_SCOPED_UI_RESOURCE_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "cc/base/cc_export.h"
  10 #include "cc/resources/ui_resource_bitmap.h"
  11 #include "cc/resources/ui_resource_client.h"
  12
  13 namespace cc {
  14
  15 class LayerTreeHost;
  16
  17 // ScopedUIResource creates an UIResource from a bitmap and a LayerTreeHost.
  18 // This class holds a pointer to the host so that when the instance goes out of
  19 // scope, the created resource is deleted.  On a GetBitmap call from the
  20 // UIResource manager, ScopeUIResource always returns the reference to the
  21 // initially given bitmap regardless of whether the request was due to lost
  22 // resource or not.
  23 class CC_EXPORT ScopedUIResource : public UIResourceClient {
  24  public:
  25   static scoped_ptr<ScopedUIResource> Create(LayerTreeHost* host,
  26                                              const UIResourceBitmap& bitmap);
  27   ~ScopedUIResource() override;
  28
  29   // UIResourceClient implementation.
  30   UIResourceBitmap GetBitmap(UIResourceId uid, bool resource_lost) override;
  31   UIResourceId id() { return id_; }
  32
  33  protected:
  34   ScopedUIResource(LayerTreeHost* host, const UIResourceBitmap& bitmap);
  35
  36   UIResourceBitmap bitmap_;
  37   LayerTreeHost* host_;
  38   UIResourceId id_;
  39
  40  private:
  41   DISALLOW_COPY_AND_ASSIGN(ScopedUIResource);
  42 };
  43
  44 }  // namespace cc
  45
  46 #endif  // CC_RESOURCES_SCOPED_UI_RESOURCE_H_