Make the Pepper proxy support in-process font rendering.

webkit/plugins/ppapi/ppb_font_impl.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 "webkit/plugins/ppapi/ppb_font_impl.h"
 
-#include "base/logging.h"
-#include "base/utf_string_conversions.h"
 #include "ppapi/c/dev/ppb_font_dev.h"
-#include "ppapi/c/pp_rect.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebFont.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebFontDescription.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebRect.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebFloatPoint.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebFloatRect.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebTextRun.h"
+#include "ppapi/thunk/thunk.h"
 #include "webkit/plugins/ppapi/common.h"
+#include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 #include "webkit/plugins/ppapi/ppb_image_data_impl.h"
 #include "webkit/plugins/ppapi/string.h"
 #include "webkit/plugins/ppapi/var.h"
-#include "webkit/glue/webkit_glue.h"
 
-using WebKit::WebFloatPoint;
-using WebKit::WebFloatRect;
-using WebKit::WebFont;
-using WebKit::WebFontDescription;
-using WebKit::WebRect;
-using WebKit::WebTextRun;
+using pp::shared_impl::WebKitForwarding;
 
 namespace webkit {
 namespace ppapi {
 
 namespace {
 
-bool IsPPFontDescriptionValid(const PP_FontDescription_Dev& desc) {
-  // Check validity of UTF-8.
-  if (desc.face.type != PP_VARTYPE_STRING &&
-      desc.face.type != PP_VARTYPE_UNDEFINED)
-    return false;
-
-  // Check enum ranges.
-  if (static_cast<int>(desc.family) < PP_FONTFAMILY_DEFAULT ||
-      static_cast<int>(desc.family) > PP_FONTFAMILY_MONOSPACE)
-    return false;
-  if (static_cast<int>(desc.weight) < PP_FONTWEIGHT_100 ||
-      static_cast<int>(desc.weight) > PP_FONTWEIGHT_900)
-    return false;
-
-  // Check for excessive sizes which may cause layout to get confused.
-  if (desc.size > 200)
-    return false;
-
-  return true;
-}
-
-// The PP_* version lacks "None", so is just one value shifted from the
-// WebFontDescription version. These values are checked in
-// PPFontDescToWebFontDesc to make sure the conversion is correct. This is a
-// macro so it can also be used in the COMPILE_ASSERTS.
-#define PP_FONTFAMILY_TO_WEB_FONTFAMILY(f) \
-  static_cast<WebFontDescription::GenericFamily>(f + 1)
-
-// Assumes the given PP_FontDescription has been validated.
-WebFontDescription PPFontDescToWebFontDesc(const PP_FontDescription_Dev& font) {
-  // Verify that the enums match so we can just static cast.
-  COMPILE_ASSERT(static_cast<int>(WebFontDescription::Weight100) ==
-                 static_cast<int>(PP_FONTWEIGHT_100),
-                 FontWeight100);
-  COMPILE_ASSERT(static_cast<int>(WebFontDescription::Weight900) ==
-                 static_cast<int>(PP_FONTWEIGHT_900),
-                 FontWeight900);
-  COMPILE_ASSERT(WebFontDescription::GenericFamilyStandard ==
-                 PP_FONTFAMILY_TO_WEB_FONTFAMILY(PP_FONTFAMILY_DEFAULT),
-                 StandardFamily);
-  COMPILE_ASSERT(WebFontDescription::GenericFamilySerif ==
-                 PP_FONTFAMILY_TO_WEB_FONTFAMILY(PP_FONTFAMILY_SERIF),
-                 SerifFamily);
-  COMPILE_ASSERT(WebFontDescription::GenericFamilySansSerif ==
-                 PP_FONTFAMILY_TO_WEB_FONTFAMILY(PP_FONTFAMILY_SANSSERIF),
-                 SansSerifFamily);
-  COMPILE_ASSERT(WebFontDescription::GenericFamilyMonospace ==
-                 PP_FONTFAMILY_TO_WEB_FONTFAMILY(PP_FONTFAMILY_MONOSPACE),
-                 MonospaceFamily);
-
-  WebFontDescription result;
-  scoped_refptr<StringVar> face_name(StringVar::FromPPVar(font.face));
-  if (face_name)
-    result.family = UTF8ToUTF16(face_name->value());
-  result.genericFamily = PP_FONTFAMILY_TO_WEB_FONTFAMILY(font.family);
-  result.size = static_cast<float>(font.size);
-  result.italic = PPBoolToBool(font.italic);
-  result.smallCaps = PPBoolToBool(font.small_caps);
-  result.weight = static_cast<WebFontDescription::Weight>(font.weight);
-  result.letterSpacing = static_cast<short>(font.letter_spacing);
-  result.wordSpacing = static_cast<short>(font.word_spacing);
-  return result;
-}
-
-// Converts the given PP_TextRun to a WebTextRun, returning true on success.
+// Converts the given PP_TextRun to a TextRun, returning true on success.
 // False means the input was invalid.
-bool PPTextRunToWebTextRun(const PP_TextRun_Dev* run, WebTextRun* output) {
+bool PPTextRunToTextRun(const PP_TextRun_Dev* run,
+                        WebKitForwarding::Font::TextRun* output) {
   scoped_refptr<StringVar> text_string(StringVar::FromPPVar(run->text));
   if (!text_string)
     return false;
-  *output = WebTextRun(UTF8ToUTF16(text_string->value()),
-                       PPBoolToBool(run->rtl),
-                       PPBoolToBool(run->override_direction));
+
+  output->text = text_string->value();
+  output->rtl = PPBoolToBool(run->rtl);
+  output->override_direction = PPBoolToBool(run->override_direction);
   return true;
 }
 
-PP_Resource Create(PP_Instance instance_id,
-                   const PP_FontDescription_Dev* description) {
-  PluginInstance* instance = ResourceTracker::Get()->GetInstance(instance_id);
-  if (!instance)
-    return 0;
-
-  if (!IsPPFontDescriptionValid(*description))
-    return 0;
-
-  scoped_refptr<PPB_Font_Impl> font(new PPB_Font_Impl(instance, *description));
-  return font->GetReference();
-}
-
-PP_Bool IsFont(PP_Resource resource) {
-  return BoolToPPBool(!!Resource::GetAs<PPB_Font_Impl>(resource).get());
-}
-
-PP_Bool Describe(PP_Resource font_id,
-                 PP_FontDescription_Dev* description,
-                 PP_FontMetrics_Dev* metrics) {
-  scoped_refptr<PPB_Font_Impl> font(Resource::GetAs<PPB_Font_Impl>(font_id));
-  if (!font.get())
-    return PP_FALSE;
-  return BoolToPPBool(font->Describe(description, metrics));
-}
-
-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) {
-  scoped_refptr<PPB_Font_Impl> font(Resource::GetAs<PPB_Font_Impl>(font_id));
-  if (!font.get())
-    return PP_FALSE;
-  return BoolToPPBool(font->DrawTextAt(image_data, text, position, color, clip,
-                                       PPBoolToBool(image_data_is_opaque)));
-}
-
-int32_t MeasureText(PP_Resource font_id, const PP_TextRun_Dev* text) {
-  scoped_refptr<PPB_Font_Impl> font(Resource::GetAs<PPB_Font_Impl>(font_id));
-  if (!font.get())
-    return -1;
-  return font->MeasureText(text);
-}
-
-uint32_t CharacterOffsetForPixel(PP_Resource font_id,
-                                 const PP_TextRun_Dev* text,
-                                 int32_t pixel_position) {
-  scoped_refptr<PPB_Font_Impl> font(Resource::GetAs<PPB_Font_Impl>(font_id));
-  if (!font.get())
-    return -1;
-  return font->CharacterOffsetForPixel(text, pixel_position);
-}
-
-int32_t PixelOffsetForCharacter(PP_Resource font_id,
-                                const PP_TextRun_Dev* text,
-                                uint32_t char_offset) {
-  scoped_refptr<PPB_Font_Impl> font(Resource::GetAs<PPB_Font_Impl>(font_id));
-  if (!font.get())
-    return false;
-  return font->PixelOffsetForCharacter(text, char_offset);
-}
-
-const PPB_Font_Dev ppb_font = {
-  &Create,
-  &IsFont,
-  &Describe,
-  &DrawTextAt,
-  &MeasureText,
-  &CharacterOffsetForPixel,
-  &PixelOffsetForCharacter
-};
-
 }  // namespace
 
 PPB_Font_Impl::PPB_Font_Impl(PluginInstance* instance,
                              const PP_FontDescription_Dev& desc)
     : Resource(instance) {
-  WebFontDescription web_font_desc = PPFontDescToWebFontDesc(desc);
-  font_.reset(WebFont::create(web_font_desc));
+  scoped_refptr<StringVar> face_name(StringVar::FromPPVar(desc.face));
+
+  WebKitForwarding::Font* result = NULL;
+  instance->module()->GetWebKitForwarding()->CreateFontForwarding(
+      NULL, desc, face_name ? face_name->value() : std::string(), &result);
+  font_forwarding_.reset(result);
 }
 
 PPB_Font_Impl::~PPB_Font_Impl() {
 }
 
 // static
 const PPB_Font_Dev* PPB_Font_Impl::GetInterface() {
-  return &ppb_font;
+  return ::ppapi::thunk::GetPPB_Font_Thunk();
+}
+
+::ppapi::thunk::PPB_Font_API* PPB_Font_Impl::AsFont_API() {
+  return this;
 }
 
 PPB_Font_Impl* PPB_Font_Impl::AsPPB_Font_Impl() {
   return this;
 }
 
-bool PPB_Font_Impl::Describe(PP_FontDescription_Dev* description,
-                             PP_FontMetrics_Dev* metrics) {
-  if (description->face.type != PP_VARTYPE_UNDEFINED)
-    return false;
+PP_Bool PPB_Font_Impl::Describe(PP_FontDescription_Dev* description,
+                                PP_FontMetrics_Dev* metrics) {
+  std::string face;
+  PP_Bool result = PP_FALSE;
+  font_forwarding_->Describe(NULL, description, &face, metrics, &result);
+  if (!result)
+    return PP_FALSE;
 
-  WebFontDescription web_desc = font_->fontDescription();
-
-  // While converting the other way in PPFontDescToWebFontDesc we validated
-  // that the enums can be casted.
-  description->face = StringVar::StringToPPVar(instance()->module(),
-                                               UTF16ToUTF8(web_desc.family));
-  description->family = static_cast<PP_FontFamily_Dev>(web_desc.genericFamily);
-  description->size = static_cast<uint32_t>(web_desc.size);
-  description->weight = static_cast<PP_FontWeight_Dev>(web_desc.weight);
-  description->italic = BoolToPPBool(web_desc.italic);
-  description->small_caps = BoolToPPBool(web_desc.smallCaps);
-
-  metrics->height = font_->height();
-  metrics->ascent = font_->ascent();
-  metrics->descent = font_->descent();
-  metrics->line_spacing = font_->lineSpacing();
-  metrics->x_height = static_cast<int32_t>(font_->xHeight());
-
-  return true;
+  // Convert the string.
+  description->face = StringVar::StringToPPVar(instance()->module(), face);
+  return PP_TRUE;
 }
 
-bool PPB_Font_Impl::DrawTextAt(PP_Resource image_data,
-                               const PP_TextRun_Dev* text,
-                               const PP_Point* position,
-                               uint32_t color,
-                               const PP_Rect* clip,
-                               bool image_data_is_opaque) {
-  WebTextRun run;
-  if (!PPTextRunToWebTextRun(text, &run))
-    return false;
-
+PP_Bool PPB_Font_Impl::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) {
   // Get and map the image data we're painting to.
   scoped_refptr<PPB_ImageData_Impl> image_resource(
       Resource::GetAs<PPB_ImageData_Impl>(image_data));
   if (!image_resource.get())
-    return false;
+    return PP_FALSE;
   ImageDataAutoMapper mapper(image_resource);
   if (!mapper.is_valid())
-    return false;
+    return PP_FALSE;
 
-  // Convert position and clip.
-  WebFloatPoint web_position(static_cast<float>(position->x),
-                             static_cast<float>(position->y));
-  WebRect web_clip;
-  if (!clip) {
-    // Use entire canvas.
-    web_clip = WebRect(0, 0, image_resource->width(), image_resource->height());
-  } else {
-    web_clip = WebRect(clip->point.x, clip->point.y,
-                       clip->size.width, clip->size.height);
-  }
+  WebKitForwarding::Font::TextRun run;
+  if (!PPTextRunToTextRun(text, &run))
+    return PP_FALSE;
 
-  font_->drawText(webkit_glue::ToWebCanvas(image_resource->mapped_canvas()),
-                  run, web_position, color, web_clip, image_data_is_opaque);
-  return true;
+  font_forwarding_->DrawTextAt(NULL, WebKitForwarding::Font::DrawTextParams(
+      image_resource->mapped_canvas(), run, position,
+      color, clip, image_data_is_opaque));
+  return PP_TRUE;
 }
 
 int32_t PPB_Font_Impl::MeasureText(const PP_TextRun_Dev* text) {
-  WebTextRun run;
-  if (!PPTextRunToWebTextRun(text, &run))
-    return -1;
-  return font_->calculateWidth(run);
+  int32_t result = -1;
+  WebKitForwarding::Font::TextRun run;
+  if (PPTextRunToTextRun(text, &run))
+    font_forwarding_->MeasureText(NULL, run, &result);
+  return result;
 }
 
 uint32_t PPB_Font_Impl::CharacterOffsetForPixel(const PP_TextRun_Dev* text,
                                                 int32_t pixel_position) {
-  WebTextRun run;
-  if (!PPTextRunToWebTextRun(text, &run))
-    return -1;
-
-  return static_cast<uint32_t>(font_->offsetForPosition(
-      run, static_cast<float>(pixel_position)));
+  uint32_t result = -1;
+  WebKitForwarding::Font::TextRun run;
+  if (PPTextRunToTextRun(text, &run)) {
+    font_forwarding_->CharacterOffsetForPixel(NULL, run, pixel_position,
+                                              &result);
+  }
+  return result;
 }
 
 int32_t PPB_Font_Impl::PixelOffsetForCharacter(const PP_TextRun_Dev* text,
                                                uint32_t char_offset) {
-  WebTextRun run;
-  if (!PPTextRunToWebTextRun(text, &run))
-    return -1;
-  if (char_offset >= run.text.length())
-    return -1;
-
-  WebFloatRect rect = font_->selectionRectForText(
-      run, WebFloatPoint(0.0f, 0.0f), font_->height(), 0, char_offset);
-  return static_cast<int>(rect.width);
+  int32_t result = -1;
+  WebKitForwarding::Font::TextRun run;
+  if (PPTextRunToTextRun(text, &run)) {
+    font_forwarding_->PixelOffsetForCharacter(NULL, run, char_offset, &result);
+  }
+  return result;
 }
 
 }  // namespace ppapi
 }  // namespace webkit