cc/resources/ui_resource_client.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_UI_RESOURCE_CLIENT_H_
   6 #define CC_RESOURCES_UI_RESOURCE_CLIENT_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "cc/base/cc_export.h"
  12
  13 namespace cc {
  14
  15 class UIResourceBitmap;
  16
  17 typedef int UIResourceId;
  18
  19 class CC_EXPORT UIResourceClient {
  20  public:
  21   // GetBitmap() will be called once soon after resource creation and then will
  22   // be called afterwards whenever the GL context is lost, on the same thread
  23   // that LayerTreeHost::CreateUIResource was called on.  It is only safe to
  24   // delete a UIResourceClient object after DeleteUIResource has been called for
  25   // all IDs associated with it.  A valid bitmap always must be returned but it
  26   // doesn't need to be the same size or format as the original.
  27   virtual UIResourceBitmap GetBitmap(UIResourceId uid,
  28                                      bool resource_lost) = 0;
  29   virtual ~UIResourceClient() {}
  30 };
  31
  32 }  // namespace cc
  33
  34 #endif  // CC_RESOURCES_UI_RESOURCE_CLIENT_H_