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 content {
  16
  17 // Dispatches messages used for font caching on Windows. This is needed because
  18 // Windows can't load fonts into its kernel cache in sandboxed processes. So the
  19 // sandboxed process asks the browser process to do this for it.
  20 class FontCacheDispatcher : public IPC::MessageFilter, public IPC::Sender {
  21  public:
  22   FontCacheDispatcher();
  23
  24   // IPC::Sender implementation:
  25   bool Send(IPC::Message* message) override;
  26
  27  private:
  28   ~FontCacheDispatcher() override;
  29
  30   // IPC::MessageFilter implementation:
  31   void OnFilterAdded(IPC::Sender* sender) override;
  32   bool OnMessageReceived(const IPC::Message& message) override;
  33   void OnChannelClosing() override;
  34
  35   // Message handlers.
  36   void OnPreCacheFont(const LOGFONT& font);
  37   void OnReleaseCachedFonts();
  38
  39   IPC::Sender* sender_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(FontCacheDispatcher);
  42 };
  43
  44 }  // namespace content
  45
  46 #endif  // CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_