Add support for proxying the font and char set interfaces.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/4653006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@65847 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 334 insertions, 0 deletions

diff --git a/ppapi/proxy/ppb_font_proxy.cc b/ppapi/proxy/ppb_font_proxy.cc
new file mode 100644
index 0000000..2313c34
--- /dev/null
+++ b/ppapi/proxy/ppb_font_proxy.cc
@@ -0,0 +1,334 @@
+// Copyright (c) 2010 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 "ppapi/proxy/ppb_font_proxy.h"
+
+#include "ppapi/c/dev/ppb_font_dev.h"
+#include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_messages.h"
+
+namespace pp {
+namespace proxy {
+
+class Font : public PluginResource {
+ public:
+  Font();
+  virtual ~Font();
+
+  // PluginResource overrides.
+  virtual Font* AsFont() { return this; }
+
+  PP_FontDescription_Dev& desc() { return desc_; }
+  PP_FontMetrics_Dev& metrics() { return metrics_; }
+
+ private:
+  PP_FontDescription_Dev desc_;
+  PP_FontMetrics_Dev metrics_;
+
+  DISALLOW_COPY_AND_ASSIGN(Font);
+};
+
+Font::Font() {
+  memset(&desc_, 0, sizeof(PP_FontDescription_Dev));
+  desc_.face.type = PP_VARTYPE_UNDEFINED;
+  memset(&metrics_, 0, sizeof(PP_FontMetrics_Dev));
+}
+
+Font::~Font() {
+  PluginDispatcher::Get()->plugin_var_tracker()->Release(desc_.face);
+}
+
+namespace {
+
+PP_Resource Create(PP_Module module_id,
+                   const PP_FontDescription_Dev* description) {
+  PluginDispatcher* dispatcher = PluginDispatcher::Get();
+
+  // Convert the input font description to a SerializedFontDescription.
+  SerializedFontDescription in_description;
+  in_description.face = SerializedVarSendInput(dispatcher, description->face);
+  in_description.family = description->family;
+  in_description.size = description->size;
+  in_description.weight = description->weight;
+  in_description.italic = description->italic;
+  in_description.small_caps = description->small_caps;
+  in_description.letter_spacing = description->letter_spacing;
+  in_description.word_spacing = description->word_spacing;
+
+  PP_Resource result;
+  SerializedFontDescription out_description;
+  std::string out_metrics;
+  PluginDispatcher::Get()->Send(new PpapiHostMsg_PPBFont_Create(
+      INTERFACE_ID_PPB_FONT,
+      module_id, in_description, &result, &out_description, &out_metrics));
+
+  if (!result)
+    return 0;  // Failure creating font.
+
+  linked_ptr<Font> object(new Font);
+
+  // Jump through some hoops to get a PP_Var with a single ref to it in our
+  // resource object.
+  ReceiveSerializedVarReturnValue face_return_value;
+  *static_cast<SerializedVar*>(&face_return_value) = out_description.face;
+  object->desc().face = face_return_value.Return(dispatcher);
+
+  // Convert the rest of the font description.
+  object->desc().family =
+      static_cast<PP_FontFamily_Dev>(out_description.family);
+  object->desc().size = out_description.size;
+  object->desc().weight =
+      static_cast<PP_FontWeight_Dev>(out_description.weight);
+  object->desc().italic = out_description.italic;
+  object->desc().small_caps = out_description.small_caps;
+  object->desc().letter_spacing = out_description.letter_spacing;
+  object->desc().word_spacing = out_description.word_spacing;
+
+  // Convert the metrics, this is just serialized as a string of bytes.
+  if (out_metrics.size() != sizeof(PP_FontMetrics_Dev))
+    return 0;
+  memcpy(&object->metrics(), out_metrics.data(), sizeof(PP_FontMetrics_Dev));
+
+  PluginDispatcher::Get()->plugin_resource_tracker()->AddResource(
+      result, object);
+  return result;
+}
+
+PP_Bool IsFont(PP_Resource resource) {
+  Font* object = PluginResource::GetAs<Font>(resource);
+  return BoolToPPBool(!!object);
+}
+
+PP_Bool Describe(PP_Resource font_id,
+              PP_FontDescription_Dev* description,
+              PP_FontMetrics_Dev* metrics) {
+  Font* object = PluginResource::GetAs<Font>(font_id);
+  if (!object)
+    return PP_FALSE;
+
+  // Copy the description, the caller expects its face PP_Var to have a ref
+  // added to it on its behalf.
+  memcpy(description, &object->desc(), sizeof(PP_FontDescription_Dev));
+  PluginDispatcher::Get()->plugin_var_tracker()->AddRef(description->face);
+
+  memcpy(metrics, &object->metrics(), sizeof(PP_FontMetrics_Dev));
+  return PP_TRUE;
+}
+
+PP_Bool DrawTextAt(PP_Resource font_id,
+                   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) {
+  PPBFont_DrawTextAt_Params params;
+  params.font = font_id;
+  params.image_data = image_data;
+  params.text_is_rtl = text->rtl;
+  params.override_direction = text->override_direction;
+  params.position = *position;
+  params.color = color;
+  if (clip) {
+    params.clip = *clip;
+    params.clip_is_null = false;
+  } else {
+    params.clip = PP_MakeRectFromXYWH(0, 0, 0, 0);
+    params.clip_is_null = true;
+  }
+  params.image_data_is_opaque = image_data_is_opaque;
+
+  Dispatcher* dispatcher = PluginDispatcher::Get();
+  PP_Bool result = PP_FALSE;
+  dispatcher->Send(new PpapiHostMsg_PPBFont_DrawTextAt(
+      INTERFACE_ID_PPB_FONT,
+      SerializedVarSendInput(dispatcher, text->text),
+      params, &result));
+  return result;
+}
+
+int32_t MeasureText(PP_Resource font_id, const PP_TextRun_Dev* text) {
+  Dispatcher* dispatcher = PluginDispatcher::Get();
+  int32_t result = 0;
+  dispatcher->Send(new PpapiHostMsg_PPBFont_MeasureText(
+      INTERFACE_ID_PPB_FONT, font_id,
+      SerializedVarSendInput(dispatcher, text->text),
+      text->rtl, text->override_direction, &result));
+  return result;
+}
+
+uint32_t CharacterOffsetForPixel(PP_Resource font_id,
+                                 const PP_TextRun_Dev* text,
+                                 int32_t pixel_position) {
+  Dispatcher* dispatcher = PluginDispatcher::Get();
+  uint32_t result = 0;
+  dispatcher->Send(new PpapiHostMsg_PPBFont_CharacterOffsetForPixel(
+      INTERFACE_ID_PPB_FONT, font_id,
+      SerializedVarSendInput(dispatcher, text->text),
+      text->rtl, text->override_direction, pixel_position, &result));
+  return result;
+}
+
+int32_t PixelOffsetForCharacter(PP_Resource font_id,
+                                const PP_TextRun_Dev* text,
+                                uint32_t char_offset) {
+  Dispatcher* dispatcher = PluginDispatcher::Get();
+  int32_t result = 0;
+  dispatcher->Send(new PpapiHostMsg_PPBFont_PixelOffsetForCharacter(
+      INTERFACE_ID_PPB_FONT, font_id,
+      SerializedVarSendInput(dispatcher, text->text),
+      text->rtl, text->override_direction, char_offset, &result));
+  return result;
+}
+
+const PPB_Font_Dev ppb_font_interface = {
+  &Create,
+  &IsFont,
+  &Describe,
+  &DrawTextAt,
+  &MeasureText,
+  &CharacterOffsetForPixel,
+  &PixelOffsetForCharacter
+};
+
+}  // namespace
+
+PPB_Font_Proxy::PPB_Font_Proxy(Dispatcher* dispatcher,
+                               const void* target_interface)
+    : InterfaceProxy(dispatcher, target_interface) {
+}
+
+PPB_Font_Proxy::~PPB_Font_Proxy() {
+}
+
+const void* PPB_Font_Proxy::GetSourceInterface() const {
+  return &ppb_font_interface;
+}
+
+InterfaceID PPB_Font_Proxy::GetInterfaceId() const {
+  return INTERFACE_ID_PPB_FONT;
+}
+
+void PPB_Font_Proxy::OnMessageReceived(const IPC::Message& msg) {
+  IPC_BEGIN_MESSAGE_MAP(PPB_Font_Proxy, msg)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFont_Create,
+                        OnMsgCreate)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFont_DrawTextAt,
+                        OnMsgDrawTextAt)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFont_MeasureText,
+                        OnMsgMeasureText)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFont_CharacterOffsetForPixel,
+                        OnMsgCharacterOffsetForPixel)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFont_PixelOffsetForCharacter,
+                        OnMsgPixelOffsetForCharacter)
+  IPC_END_MESSAGE_MAP()
+}
+
+void PPB_Font_Proxy::OnMsgCreate(
+    PP_Module pp_module,
+    const SerializedFontDescription& in_description,
+    PP_Resource* result,
+    SerializedFontDescription* out_description,
+    std::string* out_metrics) {
+  // Convert the face name in the input description.
+  PP_FontDescription_Dev in_desc;
+  SerializedVarReceiveInput in_face_name(in_description.face);
+  in_desc.face = in_face_name.Get(dispatcher());
+
+  // The rest of the font description is easy.
+  in_desc.family = static_cast<PP_FontFamily_Dev>(in_description.family);
+  in_desc.size = in_description.size;
+  in_desc.weight = static_cast<PP_FontWeight_Dev>(in_description.weight);
+  in_desc.italic = in_description.italic;
+  in_desc.small_caps = in_description.small_caps;
+  in_desc.letter_spacing = in_description.letter_spacing;
+  in_desc.word_spacing = in_description.word_spacing;
+
+  *result = ppb_font_target()->Create(pp_module, &in_desc);
+  if (!*result)
+    return;
+
+  // Get the metrics and resulting description to return to the browser.
+  PP_FontDescription_Dev out_desc;
+  PP_FontMetrics_Dev metrics;
+  ppb_font_target()->Describe(*result, &out_desc, &metrics);
+
+  // Convert the PP_Var in the resulting description to an out param. This
+  // should clean up the ref |Describe| assigned to our font name.
+  SerializedVarOutParam out_face_name(&out_description->face);
+  *out_face_name.OutParam(dispatcher()) = out_desc.face;
+
+  // The rest of the font description is easy.
+  out_description->family = out_desc.family;
+  out_description->size = out_desc.size;
+  out_description->weight = out_desc.weight;
+  out_description->italic = out_desc.italic;
+  out_description->small_caps = out_desc.small_caps;
+  out_description->letter_spacing = out_desc.letter_spacing;
+  out_description->word_spacing = out_desc.word_spacing;
+
+  // Metrics are just serialized as a string.
+  out_metrics->assign(reinterpret_cast<const char*>(&metrics),
+                      sizeof(PP_FontMetrics_Dev));
+}
+
+void PPB_Font_Proxy::OnMsgDrawTextAt(SerializedVarReceiveInput text,
+                                     const PPBFont_DrawTextAt_Params& params,
+                                     PP_Bool* result) {
+  PP_TextRun_Dev run;
+  run.text = text.Get(dispatcher());
+  run.rtl = params.text_is_rtl;
+  run.override_direction = params.override_direction;
+
+  *result = ppb_font_target()->DrawTextAt(params.font, params.image_data,
+      &run, &params.position, params.color,
+      params.clip_is_null ? NULL : &params.clip, params.image_data_is_opaque);
+}
+
+void PPB_Font_Proxy::OnMsgMeasureText(PP_Resource font,
+                                      SerializedVarReceiveInput text,
+                                      PP_Bool text_is_rtl,
+                                      PP_Bool override_direction,
+                                      int32_t* result) {
+  PP_TextRun_Dev run;
+  run.text = text.Get(dispatcher());
+  run.rtl = text_is_rtl;
+  run.override_direction = override_direction;
+
+  *result = ppb_font_target()->MeasureText(font, &run);
+}
+
+void PPB_Font_Proxy::OnMsgCharacterOffsetForPixel(
+    PP_Resource font,
+    SerializedVarReceiveInput text,
+    PP_Bool text_is_rtl,
+    PP_Bool override_direction,
+    int32_t pixel_pos,
+    uint32_t* result) {
+  PP_TextRun_Dev run;
+  run.text = text.Get(dispatcher());
+  run.rtl = text_is_rtl;
+  run.override_direction = override_direction;
+
+  *result = ppb_font_target()->CharacterOffsetForPixel(font, &run, pixel_pos);
+}
+
+void PPB_Font_Proxy::OnMsgPixelOffsetForCharacter(
+    PP_Resource font,
+    SerializedVarReceiveInput text,
+    PP_Bool text_is_rtl,
+    PP_Bool override_direction,
+    uint32_t char_offset,
+    int32_t* result) {
+  PP_TextRun_Dev run;
+  run.text = text.Get(dispatcher());
+  run.rtl = text_is_rtl;
+  run.override_direction = override_direction;
+
+  *result = ppb_font_target()->PixelOffsetForCharacter(font, &run, char_offset);
+}
+
+}  // namespace proxy
+}  // namespace pp