content/common/font_cache_dispatcher_win.h

   1 // Copyright (c) 2012 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 CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_
   6 #define CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_
   7
   8 #include <windows.h>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/singleton.h"
  12 #include "ipc/ipc_sender.h"
  13 #include "ipc/message_filter.h"
  14
  15 namespace IPC {
  16 class Channel;
  17 }
  18
  19 namespace content {
  20
  21 // Dispatches messages used for font caching on Windows. This is needed because
  22 // Windows can't load fonts into its kernel cache in sandboxed processes. So the
  23 // sandboxed process asks the browser process to do this for it.
  24 class FontCacheDispatcher : public IPC::MessageFilter, public IPC::Sender {
  25  public:
  26   FontCacheDispatcher();
  27   virtual ~FontCacheDispatcher();
  28
  29   // IPC::Sender implementation:
  30   virtual bool Send(IPC::Message* message) OVERRIDE;
  31
  32  private:
  33   // IPC::MessageFilter implementation:
  34   virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
  35   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  36   virtual void OnChannelClosing() OVERRIDE;
  37
  38   // Message handlers.
  39   void OnPreCacheFont(const LOGFONT& font);
  40   void OnReleaseCachedFonts();
  41
  42   IPC::Channel* channel_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(FontCacheDispatcher);
  45 };
  46
  47 }  // namespace content
  48
  49 #endif  // CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_