Hook up the new font API to WebKit. This moves the existing GetFontTable API ...

webkit/glue/plugins/pepper_font.cc

 // 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 "build/build_config.h"
-
 #include "webkit/glue/plugins/pepper_font.h"
 
-#if defined(OS_LINUX)
-#include <unistd.h>
-#endif
+#include "base/logging.h"
+#include "base/utf_string_conversions.h"
+#include "third_party/ppapi/c/pp_rect.h"
+#include "third_party/ppapi/c/ppb_font.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebFont.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebFontDescription.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebRect.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebFloatPoint.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebFloatRect.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebTextRun.h"
+#include "webkit/glue/plugins/pepper_image_data.h"
+#include "webkit/glue/plugins/pepper_plugin_module.h"
+#include "webkit/glue/plugins/pepper_string.h"
+#include "webkit/glue/plugins/pepper_var.h"
+#include "webkit/glue/webkit_glue.h"
 
-#include "base/logging.h"
-#include "third_party/ppapi/c/ppb_font.h"
-#include "webkit/glue/plugins/pepper_plugin_module.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;
 
 namespace pepper {
 
 namespace {
 
-PP_Resource MatchFontWithFallback(PP_Module module_id,
-                                  const PP_FontDescription* description) {
-#if defined(OS_LINUX)
+bool IsPPFontDescriptionValid(const PP_FontDescription& desc) {
+  // Check validity of UTF-8.
+  if (desc.face.type != PP_VARTYPE_STRING && desc.face.type != PP_VARTYPE_VOID)
+    return false;
+
+  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;
+
+  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& 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;
+  String* face_name = GetString(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 = font.italic;
+  result.smallCaps = 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.
+// False means the input was invalid.
+bool PPTextRunToWebTextRun(const PP_TextRun* run, WebTextRun* output) {
+  String* text_string = GetString(run->text);
+  if (!text_string)
+    return false;
+  *output = WebTextRun(UTF8ToUTF16(text_string->value()),
+                       run->rtl, run->override_direction);
+  return true;
+}
+
+PP_Resource Create(PP_Module module_id,
+                   const PP_FontDescription* description) {
   PluginModule* module = PluginModule::FromPPModule(module_id);
   if (!module)
     return 0;
 
-  int fd = webkit_glue::MatchFontWithFallback(description->face,
-                                              description->weight >= 700,
-                                              description->italic,
-                                              description->charset);
-  if (fd == -1)
+  if (!IsPPFontDescriptionValid(*description))
     return 0;
 
-  scoped_refptr<Font> font(new Font(module, fd));
-
+  scoped_refptr<Font> font(new Font(module, *description));
   return font->GetReference();
-#else
-  // For trusted pepper plugins, this is only needed in Linux since font loading
-  // on Windows and Mac works through the renderer sandbox.
-  return false;
-#endif
 }
 
 bool IsFont(PP_Resource resource) {
-  return !!Resource::GetAs<Font>(resource);
+  return !!Resource::GetAs<Font>(resource).get();
 }
 
-bool GetFontTable(PP_Resource font_id,
-                  uint32_t table,
-                  void* output,
-                  uint32_t* output_length) {
+bool Describe(PP_Resource font_id,
+              PP_FontDescription* description,
+              PP_FontMetrics* metrics) {
   scoped_refptr<Font> font(Resource::GetAs<Font>(font_id));
   if (!font.get())
     return false;
+  return font->Describe(description, metrics);
+}
 
-  return font->GetFontTable(table, output, output_length);
+bool DrawTextAt(PP_Resource font_id,
+                PP_Resource image_data,
+                const PP_TextRun* text,
+                const PP_Point* position,
+                uint32_t color,
+                const PP_Rect* clip,
+                bool image_data_is_opaque) {
+  scoped_refptr<Font> font(Resource::GetAs<Font>(font_id));
+  if (!font.get())
+    return false;
+  return font->DrawTextAt(image_data, text, position, color, clip,
+                          image_data_is_opaque);
+}
+
+int32_t MeasureText(PP_Resource font_id, const PP_TextRun* text) {
+  scoped_refptr<Font> font(Resource::GetAs<Font>(font_id));
+  if (!font.get())
+    return -1;
+  return font->MeasureText(text);
+}
+
+uint32_t CharacterOffsetForPixel(PP_Resource font_id,
+                                 const PP_TextRun* text,
+                                 int32_t pixel_position) {
+  scoped_refptr<Font> font(Resource::GetAs<Font>(font_id));
+  if (!font.get())
+    return false;
+  return font->CharacterOffsetForPixel(text, pixel_position);
+}
+
+int32_t PixelOffsetForCharacter(PP_Resource font_id,
+                                const PP_TextRun* text,
+                                uint32_t char_offset) {
+  scoped_refptr<Font> font(Resource::GetAs<Font>(font_id));
+  if (!font.get())
+    return false;
+  return font->PixelOffsetForCharacter(text, char_offset);
 }
 
 const PPB_Font ppb_font = {
-  &MatchFontWithFallback,
+  &Create,
   &IsFont,
-  &GetFontTable,
+  &Describe,
+  &DrawTextAt,
+  &MeasureText,
+  &CharacterOffsetForPixel,
+  &PixelOffsetForCharacter
 };
 
 }  // namespace
 
-Font::Font(PluginModule* module, int fd)
-    : Resource(module),
-      fd_(fd) {
+Font::Font(PluginModule* module, const PP_FontDescription& desc)
+    : Resource(module) {
+  WebFontDescription web_font_desc = PPFontDescToWebFontDesc(desc);
+  font_.reset(WebFont::create(web_font_desc));
 }
 
 Font::~Font() {
-#if defined (OS_LINUX)
-  close(fd_);
-#endif
 }
 
 // static
 const PPB_Font* Font::GetInterface() {
   return &ppb_font;
 }
 
-bool Font::GetFontTable(uint32_t table,
-                        void* output,
-                        uint32_t* output_length) {
-#if defined(OS_LINUX)
-  size_t temp_size = static_cast<size_t>(*output_length);
-  bool rv = webkit_glue::GetFontTable(
-      fd_, table, static_cast<uint8_t*>(output), &temp_size);
-  *output_length = static_cast<uint32_t>(temp_size);
-  return rv;
-#else
-  return false;
-#endif
+bool Font::Describe(PP_FontDescription* description,
+                    PP_FontMetrics* metrics) {
+  if (description->face.type != PP_VARTYPE_VOID)
+    return false;
+
+  WebFontDescription web_desc = font_->fontDescription();
+
+  // While converting the other way in PPFontDescToWebFontDesc we validated
+  // that the enums can be casted.
+  description->face = StringToPPVar(UTF16ToUTF8(web_desc.family));
+  description->family = static_cast<PP_FontFamily>(web_desc.genericFamily);
+  description->size = static_cast<uint32_t>(web_desc.size);
+  description->weight = static_cast<PP_FontWeight>(web_desc.weight);
+  description->italic = web_desc.italic;
+  description->small_caps = 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;
+}
+
+bool Font::DrawTextAt(PP_Resource image_data,
+                      const PP_TextRun* 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;
+
+  // Get and map the image data we're painting to.
+  scoped_refptr<ImageData> image_resource(
+      Resource::GetAs<ImageData>(image_data));
+  if (!image_resource.get())
+    return false;
+  ImageDataAutoMapper mapper(image_resource);
+  if (!mapper.is_valid())
+    return 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);
+  }
+
+  font_->drawText(webkit_glue::ToWebCanvas(image_resource->mapped_canvas()),
+                  run, web_position, color, web_clip, image_data_is_opaque);
+  return true;
+}
+
+int32_t Font::MeasureText(const PP_TextRun* text) {
+  WebTextRun run;
+  if (!PPTextRunToWebTextRun(text, &run))
+    return -1;
+  return font_->calculateWidth(run);
+}
+
+uint32_t Font::CharacterOffsetForPixel(const PP_TextRun* 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)));
+}
+
+int32_t Font::PixelOffsetForCharacter(const PP_TextRun* 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 rect.width;
 }
 
 }  // namespace pepper