Make the Pepper proxy support in-process font rendering.

ppapi/proxy/ppb_font_proxy.h

 // 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.
 
 #ifndef PPAPI_PROXY_PPB_FONT_PROXY_H_
 #define PPAPI_PROXY_PPB_FONT_PROXY_H_
 
 #include "base/basictypes.h"
-#include "ppapi/c/pp_instance.h"
-#include "ppapi/c/pp_resource.h"
+#include "base/synchronization/waitable_event.h"
 #include "ppapi/proxy/host_resource.h"
 #include "ppapi/proxy/interface_proxy.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/shared_impl/webkit_forwarding.h"
+#include "ppapi/thunk/ppb_font_api.h"
 
 struct PPB_Font_Dev;
 
 namespace pp {
 namespace proxy {
 
-struct PPBFont_DrawTextAt_Params;
-struct SerializedFontDescription;
 class SerializedVarReceiveInput;
 
 class PPB_Font_Proxy : public InterfaceProxy {
  public:
   PPB_Font_Proxy(Dispatcher* dispatcher, const void* target_interface);
   virtual ~PPB_Font_Proxy();
 
   static const Info* GetInfo();
 
-  const PPB_Font_Dev* ppb_font_target() const {
-    return static_cast<const PPB_Font_Dev*>(target_interface());
-  }
-
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
-  // Message handlers.
-  void OnMsgCreate(PP_Instance instance,
-                   const SerializedFontDescription& in_description,
-                   HostResource* result,
-                   SerializedFontDescription* out_description,
-                   std::string* out_metrics);
-  void OnMsgDrawTextAt(SerializedVarReceiveInput text,
-                       const PPBFont_DrawTextAt_Params& params,
-                       PP_Bool* result);
-  void OnMsgMeasureText(HostResource font,
-                        SerializedVarReceiveInput text,
-                        PP_Bool text_is_rtl,
-                        PP_Bool override_direction,
-                        int32_t* result);
-  void OnMsgCharacterOffsetForPixel(HostResource font,
-                                    SerializedVarReceiveInput text,
-                                    PP_Bool text_is_rtl,
-                                    PP_Bool override_direction,
-                                    int32_t pixel_pos,
-                                    uint32_t* result);
-  void OnMsgPixelOffsetForCharacter(HostResource font,
-                                    SerializedVarReceiveInput text,
-                                    PP_Bool text_is_rtl,
-                                    PP_Bool override_direction,
-                                    uint32_t char_offset,
-                                    int32_t* result);
+  DISALLOW_COPY_AND_ASSIGN(PPB_Font_Proxy);
+};
 
-  DISALLOW_COPY_AND_ASSIGN(PPB_Font_Proxy);
+class Font : public PluginResource,
+             public ppapi::thunk::PPB_Font_API {
+ public:
+  // Note that there isn't a "real" resource in the renderer backing a font,
+  // it lives entirely in the plugin process. So the resource ID in the host
+  // resource should be 0. However, various code assumes the instance in the
+  // host resource is valid (this is how resources are associated with
+  // instances), so that should be set.
+  Font(const HostResource& resource, const PP_FontDescription_Dev& desc);
+  virtual ~Font();
+
+  // ResourceObjectBase.
+  virtual ppapi::thunk::PPB_Font_API* AsFont_API() OVERRIDE;
+
+  // PluginResource overrides.
+  virtual Font* AsFont() OVERRIDE;
+
+  // PPB_Font_API implementation.
+  virtual PP_Bool Describe(PP_FontDescription_Dev* description,
+                           PP_FontMetrics_Dev* metrics) OVERRIDE;
+  virtual PP_Bool DrawTextAt(PP_Resource image_data,
+                             const PP_TextRun_Dev* text,
+                             const PP_Point* position,
+                             uint32_t color,
+                             const PP_Rect* clip,
+                             PP_Bool image_data_is_opaque) OVERRIDE;
+  virtual int32_t MeasureText(const PP_TextRun_Dev* text) OVERRIDE;
+  virtual uint32_t CharacterOffsetForPixel(const PP_TextRun_Dev* text,
+                                           int32_t pixel_position) OVERRIDE;
+  virtual int32_t PixelOffsetForCharacter(const PP_TextRun_Dev* text,
+                                          uint32_t char_offset) OVERRIDE;
+
+ private:
+  // Posts the given closure to the WebKit thread and waits on the
+  // webkit_event_ for the task to continue.
+  void RunOnWebKitThread(const base::Closure& task);
+
+  base::WaitableEvent webkit_event_;
+
+  scoped_ptr<pp::shared_impl::WebKitForwarding::Font> font_forwarding_;
+
+  DISALLOW_COPY_AND_ASSIGN(Font);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PROXY_PPB_FONT_PROXY_H_