Use Skia's matchFamilyStyleCharacter API for font fallback

third_party/WebKit/Source/platform/fonts/skia/FontCacheSkia.cpp

 /*
  * Copyright (c) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 49 matching lines @@
 
 namespace blink {
 
 #if OS(ANDROID) || OS(LINUX)
 // Android special locale for retrieving the color emoji font
 // based on the proposed changes in UTR #51 for introducing
 // an Emoji script code:
 // http://www.unicode.org/reports/tr51/proposed.html#Emoji_Script
 static const char* kAndroidColorEmojiLocale = "und-Zsye";
 
-// SkFontMgr requires script-based locale names, like "zh-Hant" and "zh-Hans",
-// instead of "zh-CN" and "zh-TW".
-static CString toSkFontMgrLocale(const String& locale)
-{
-    if (!locale.startsWith("zh", TextCaseInsensitive))
-        return locale.ascii();
-
-    switch (localeToScriptCodeForFontSelection(locale)) {
-    case USCRIPT_SIMPLIFIED_HAN:
-        return "zh-Hans";
-    case USCRIPT_TRADITIONAL_HAN:
-        return "zh-Hant";
-    default:
-        return locale.ascii();
-    }
-}
-
 // This function is called on android or when we are emulating android fonts on linux and the
 // embedder has overriden the default fontManager with WebFontRendering::setSkiaFontMgr.
 // static
 AtomicString FontCache::getFamilyNameForCharacter(SkFontMgr* fm, UChar32 c, const FontDescription& fontDescription, FontFallbackPriority fallbackPriority)
 {
     ASSERT(fm);
 
     const size_t kMaxLocales = 4;
     const char* bcp47Locales[kMaxLocales];
     size_t localeCount = 0;
@@ skipping 67 matching lines @@
     if (!fontPlatformData) {
         DEFINE_STATIC_LOCAL(const FontFaceCreationParams, mssansserifCreationParams, (AtomicString("Microsoft Sans Serif", AtomicString::ConstructFromLiteral)));
         fontPlatformData = getFontPlatformData(description, mssansserifCreationParams);
     }
 #endif
 
     ASSERT(fontPlatformData);
     return fontDataFromFontPlatformData(fontPlatformData, shouldRetain);
 }
 
-#if OS(WIN) || OS(LINUX)
-static inline SkFontStyle fontStyle(const FontDescription& fontDescription)
-{
-    int width = static_cast<int>(fontDescription.stretch());
-    int weight = (fontDescription.weight() - FontWeight100 + 1) * 100;
-    SkFontStyle::Slant slant = fontDescription.style() == FontStyleItalic
-        ? SkFontStyle::kItalic_Slant
-        : SkFontStyle::kUpright_Slant;
-    return SkFontStyle(weight, width, slant);
-}
-
-static_assert(static_cast<int>(FontStretchUltraCondensed) == static_cast<int>(SkFontStyle::kUltraCondensed_Width),
-    "FontStretchUltraCondensed should map to kUltraCondensed_Width");
-static_assert(static_cast<int>(FontStretchNormal) == static_cast<int>(SkFontStyle::kNormal_Width),
-    "FontStretchNormal should map to kNormal_Width");
-static_assert(static_cast<int>(FontStretchUltraExpanded) == static_cast<int>(SkFontStyle::kUltaExpanded_Width),
-    "FontStretchUltraExpanded should map to kUltaExpanded_Width");
-#endif
-
 PassRefPtr<SkTypeface> FontCache::createTypeface(const FontDescription& fontDescription, const FontFaceCreationParams& creationParams, CString& name)
 {
 #if !OS(WIN) && !OS(ANDROID)
     if (creationParams.creationType() == CreateFontByFciIdAndTtcIndex) {
         if (Platform::current()->sandboxSupport())
             return typefaceForFontconfigInterfaceIdAndTtcIndex(creationParams.fontconfigInterfaceId(), creationParams.ttcIndex());
         return adoptRef(SkTypeface::CreateFromFile(creationParams.filename().data(), creationParams.ttcIndex()));
     }
 #endif
 
@@ skipping 16 matching lines @@
 #if OS(WIN)
     if (s_sideloadedFonts) {
         HashMap<String, RefPtr<SkTypeface>>::iterator sideloadedFont =
             s_sideloadedFonts->find(name.data());
         if (sideloadedFont != s_sideloadedFonts->end())
             return sideloadedFont->value;
     }
 
     if (m_fontManager) {
         return adoptRef(useDirectWrite()
-            ? m_fontManager->matchFamilyStyle(name.data(), fontStyle(fontDescription))
-            : m_fontManager->legacyCreateTypeface(name.data(), style)
-            );
+            ? m_fontManager->matchFamilyStyle(name.data(), fontDescription.skiaFontStyle())
+            : m_fontManager->legacyCreateTypeface(name.data(), style));
     }
 #endif
 
 #if OS(LINUX)
     // On linux if the fontManager has been overridden then we should be calling the embedder
     // provided font Manager rather than calling SkTypeface::CreateFromName which may redirect the
     // call to the default font Manager.
     if (m_fontManager)
-        return adoptRef(m_fontManager->matchFamilyStyle(name.data(), fontStyle(fontDescription)));
+        return adoptRef(m_fontManager->matchFamilyStyle(name.data(), fontDescription.skiaFontStyle()));
 #endif
 
     // FIXME: Use m_fontManager, SkFontStyle and matchFamilyStyle instead of
     // CreateFromName on all platforms.
     return adoptRef(SkTypeface::CreateFromName(name.data(), static_cast<SkTypeface::Style>(style)));
 }
 
 #if !OS(WIN)
 PassOwnPtr<FontPlatformData> FontCache::createFontPlatformData(const FontDescription& fontDescription,
     const FontFaceCreationParams& creationParams, float fontSize)
 {
     CString name;
     RefPtr<SkTypeface> tf(createTypeface(fontDescription, creationParams, name));
     if (!tf)
         return nullptr;
 
     return adoptPtr(new FontPlatformData(tf,
         name.data(),
         fontSize,
         (fontDescription.weight() >= FontWeight600 && !tf->isBold()) || fontDescription.isSyntheticBold(),
         ((fontDescription.style() == FontStyleItalic || fontDescription.style() == FontStyleOblique) && !tf->isItalic()) || fontDescription.isSyntheticItalic(),
         fontDescription.orientation(),
         fontDescription.useSubpixelPositioning()));
 }
 #endif // !OS(WIN)
 
 } // namespace blink