New implementation of font precache on Windows.

chrome/service/service_utility_process_host.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/service/service_utility_process_host.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "base/scoped_temp_dir.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_utility_messages.h"
 #include "ipc/ipc_switches.h"
 #include "printing/page_range.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/rect.h"
 
 #if defined(OS_WIN)
 #include "base/memory/scoped_ptr.h"
 #include "base/win/scoped_handle.h"
+#include "content/common/child_process_messages.h"
 #include "printing/emf_win.h"
 #endif
 
 ServiceUtilityProcessHost::ServiceUtilityProcessHost(
     Client* client, base::MessageLoopProxy* client_message_loop_proxy)
         : ServiceChildProcessHost(ChildProcessInfo::UTILITY_PROCESS),
           client_(client),
           client_message_loop_proxy_(client_message_loop_proxy),
           waiting_for_reply_(false) {
+  process_id_ = ChildProcessInfo::GenerateChildProcessUniqueId();
 }
 
 ServiceUtilityProcessHost::~ServiceUtilityProcessHost() {
 }
 
 bool ServiceUtilityProcessHost::StartRenderPDFPagesToMetafile(
     const FilePath& pdf_path,
     const gfx::Rect& render_area,
     int render_dpi,
     const std::vector<printing::PageRange>& page_ranges) {
@@ skipping 95 matching lines @@
         NewRunnableMethod(client_.get(), &Client::OnChildDied));
   }
   // The base class implementation will delete |this|.
   ServiceChildProcessHost::OnChildDied();
 }
 
 bool ServiceUtilityProcessHost::OnMessageReceived(const IPC::Message& message) {
   bool msg_is_ok = false;
   IPC_BEGIN_MESSAGE_MAP_EX(ServiceUtilityProcessHost, message, msg_is_ok)
 #if defined(OS_WIN)  // This hack is Windows-specific.
-    IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_PreCacheFont, OnPreCacheFont)
+    IPC_MESSAGE_HANDLER(ChildProcessHostMsg_PreCacheFont, OnPreCacheFont)
+    IPC_MESSAGE_HANDLER(ChildProcessHostMsg_ReleaseCachedFonts,
+                        OnReleaseCachedFonts)
 #endif
     IPC_MESSAGE_HANDLER(
         ChromeUtilityHostMsg_RenderPDFPagesToMetafile_Succeeded,
         OnRenderPDFPagesToMetafileSucceeded)
     IPC_MESSAGE_UNHANDLED(msg_is_ok__ = MessageForClient(message))
   IPC_END_MESSAGE_MAP_EX()
   return true;
 }
 
 bool ServiceUtilityProcessHost::MessageForClient(const IPC::Message& message) {
   DCHECK(waiting_for_reply_);
   bool ret = client_message_loop_proxy_->PostTask(
       FROM_HERE,
       NewRunnableMethod(client_.get(), &Client::OnMessageReceived,
                         message));
   waiting_for_reply_ = false;
   return ret;
 }
 
 #if defined(OS_WIN)  // This hack is Windows-specific.
 void ServiceUtilityProcessHost::OnPreCacheFont(const LOGFONT& font) {
-  PreCacheFont(font);
+  PreCacheFont(font, process_id_);
+}
+
+void ServiceUtilityProcessHost::OnReleaseCachedFonts() {
+  ReleaseCachedFonts(process_id_);
 }
 #endif  // OS_WIN
 
 void ServiceUtilityProcessHost::OnRenderPDFPagesToMetafileSucceeded(
     int highest_rendered_page_number) {
   DCHECK(waiting_for_reply_);
   // If the metafile was successfully created, we need to take our hands off the
   // scratch metafile directory. The client will delete it when it is done with
   // metafile.
   scratch_metafile_dir_->Take();
@@ skipping 38 matching lines @@
   printing::Emf metafile;
   if (!metafile.InitFromFile(metafile_path)) {
     OnRenderPDFPagesToMetafileFailed();
   } else {
     OnRenderPDFPagesToMetafileSucceeded(metafile,
                                         highest_rendered_page_number);
   }
 #endif  // defined(OS_WIN)
 }