Use Skia's matchFamilyStyleCharacter API for font fallback

third_party/WebKit/Source/platform/fonts/FontDescription.cpp

 /*
  * Copyright (C) 2007 Nicholas Shanks <contact@nickshanks.com>
  * Copyright (C) 2008 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 260 matching lines @@
     addFloatToHash(hash, m_adjustedSize);
     addFloatToHash(hash, m_sizeAdjust);
     addFloatToHash(hash, m_letterSpacing);
     addFloatToHash(hash, m_wordSpacing);
     addToHash(hash, m_fieldsAsUnsigned[0]);
     addToHash(hash, m_fieldsAsUnsigned[1]);
 
     return hash;
 }
 
+SkFontStyle FontDescription::skiaFontStyle() const
+{
+    int width = static_cast<int>(stretch());
+    int fontWeight = (weight() - FontWeight100 + 1) * 100;

[eae, 2016/02/29 23:11:26]

We might want to add a helper for this. numericFontWeight for instance?

[Ilya Kulshin, 2016/03/01 03:31:14]

Done. Added a helper, although perhaps the actual numeric values of
FontWeightXXX should just be XXX (but I'm not going to make that change at this
time).

+    SkFontStyle::Slant slant = style() == FontStyleItalic
+        ? SkFontStyle::kItalic_Slant
+        : SkFontStyle::kUpright_Slant;
+    return SkFontStyle(fontWeight, 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");
+}
+
 } // namespace blink