Add fallback fonts for math and symbol blocks on Windows

Source/platform/fonts/win/FontFallbackWin.cpp

Index: Source/platform/fonts/win/FontFallbackWin.cpp
diff --git a/Source/platform/fonts/win/FontFallbackWin.cpp b/Source/platform/fonts/win/FontFallbackWin.cpp
index a7f5be4cdc1052d3035da781586990baa85dbd20..d1f5340ea33a05a431bf4e027656eb7957eb234e 100644
--- a/Source/platform/fonts/win/FontFallbackWin.cpp
+++ b/Source/platform/fonts/win/FontFallbackWin.cpp
@@ -285,8 +285,10 @@ UScriptCode getScript(int ucs4)
 const UChar* getFontBasedOnUnicodeBlock(int ucs4, SkFontMgr* fontManager)
 {
     static const UChar* emojiFonts[] = {L"Segoe UI Emoji", L"Segoe UI Symbol"};
+    static const UChar* mathFonts[] = {L"Cambria Math", L"Segoe UI Symbol", L"Code2000"};
     static const UChar* symbolFont = L"Segoe UI Symbol";
     static const UChar* emojiFont = 0;
+    static const UChar* mathFont = 0;
     static bool initialized = false;
     if (!initialized) {
         for (size_t i = 0; i < WTF_ARRAY_LENGTH(emojiFonts); i++) {
@@ -295,6 +297,12 @@ const UChar* getFontBasedOnUnicodeBlock(int ucs4, SkFontMgr* fontManager)
                 break;
             }
         }
+        for (size_t i = 0; i < WTF_ARRAY_LENGTH(mathFonts); i++) {
+            if (isFontPresent(mathFonts[i], fontManager)) {
+                mathFont = mathFonts[i];
+                break;
+            }
+        }
         initialized = true;
     }
 
@@ -302,16 +310,30 @@ const UChar* getFontBasedOnUnicodeBlock(int ucs4, SkFontMgr* fontManager)
     switch (block) {
     case UBLOCK_EMOTICONS:
         return emojiFont;
+    case UBLOCK_ENCLOSED_ALPHANUMERIC_SUPPLEMENT:

[ebraminio, 2015/09/04 21:28:24]

Sorry, UBLOCK_ENCLOSED_ALPHANUMERIC_SUPPLEMENT which contains country flags is
rather an Emoji one, I was added the comment a little more upper :)

     case UBLOCK_PLAYING_CARDS:
     case UBLOCK_MISCELLANEOUS_SYMBOLS:
+    case UBLOCK_MISCELLANEOUS_SYMBOLS_AND_ARROWS:
     case UBLOCK_MISCELLANEOUS_SYMBOLS_AND_PICTOGRAPHS:
-    case UBLOCK_MISCELLANEOUS_TECHNICAL:
     case UBLOCK_TRANSPORT_AND_MAP_SYMBOLS:
     case UBLOCK_ALCHEMICAL_SYMBOLS:
     case UBLOCK_RUNIC:
-    case UBLOCK_SUPPLEMENTAL_MATHEMATICAL_OPERATORS:
     case UBLOCK_DINGBATS:
+    case UBLOCK_GOTHIC:
         return symbolFont;
+    case UBLOCK_ARROWS:
+    case UBLOCK_MATHEMATICAL_OPERATORS:
+    case UBLOCK_MISCELLANEOUS_TECHNICAL:
+    case UBLOCK_GEOMETRIC_SHAPES:
+    case UBLOCK_MISCELLANEOUS_MATHEMATICAL_SYMBOLS_A:
+    case UBLOCK_SUPPLEMENTAL_ARROWS_A:
+    case UBLOCK_SUPPLEMENTAL_ARROWS_B:
+    case UBLOCK_MISCELLANEOUS_MATHEMATICAL_SYMBOLS_B:
+    case UBLOCK_SUPPLEMENTAL_MATHEMATICAL_OPERATORS:
+    case UBLOCK_MATHEMATICAL_ALPHANUMERIC_SYMBOLS:
+    case UBLOCK_ARABIC_MATHEMATICAL_ALPHABETIC_SYMBOLS:
+    case UBLOCK_GEOMETRIC_SHAPES_EXTENDED:
+        return mathFont;
     default:
         return 0;
     };