Initial OpenType Font Variations Support

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

 /*
  * Copyright (C) 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 81 matching lines @@
 
 ots::TableAction BlinkOTSContext::GetTableAction(uint32_t tag) {
   const uint32_t cbdtTag = OTS_TAG('C', 'B', 'D', 'T');
   const uint32_t cblcTag = OTS_TAG('C', 'B', 'L', 'C');
   const uint32_t colrTag = OTS_TAG('C', 'O', 'L', 'R');
   const uint32_t cpalTag = OTS_TAG('C', 'P', 'A', 'L');
 #if HB_VERSION_ATLEAST(1, 0, 0)
   const uint32_t gdefTag = OTS_TAG('G', 'D', 'E', 'F');
   const uint32_t gposTag = OTS_TAG('G', 'P', 'O', 'S');
   const uint32_t gsubTag = OTS_TAG('G', 'S', 'U', 'B');
+
+  // Font Variations related tables
+  // See "Variation Tables" in Terminology section of
+  // https://www.microsoft.com/typography/otspec/otvaroverview.htm
+  const uint32_t avarTag = OTS_TAG('a', 'v', 'a', 'r');
+  const uint32_t cvarTag = OTS_TAG('c', 'v', 'a', 'r');
+  const uint32_t fvarTag = OTS_TAG('f', 'v', 'a', 'r');
+  const uint32_t gvarTag = OTS_TAG('g', 'v', 'a', 'r');
+  const uint32_t hvarTag = OTS_TAG('H', 'V', 'A', 'R');
+  const uint32_t mvarTag = OTS_TAG('M', 'V', 'A', 'R');
+  const uint32_t vvarTag = OTS_TAG('V', 'V', 'A', 'R');
 #endif
 
   switch (tag) {
     // Google Color Emoji Tables
     case cbdtTag:
     case cblcTag:
     // Windows Color Emoji Tables
     case colrTag:
     case cpalTag:
 #if HB_VERSION_ATLEAST(1, 0, 0)
     // Let HarfBuzz handle how to deal with broken tables.
+    case avarTag:
+    case cvarTag:
+    case fvarTag:
+    case gvarTag:
+    case hvarTag:
+    case mvarTag:
+    case vvarTag:
     case gdefTag:
     case gposTag:
     case gsubTag:
 #endif
       return ots::TABLE_ACTION_PASSTHRU;
     default:
       return ots::TABLE_ACTION_DEFAULT;
   }
 }
 
@@ skipping 85 matching lines @@
   if (!typeface) {
     setErrorString("Not a valid font data");
     return nullptr;
   }
 
   m_decodedSize = decodedLength;
   return typeface;
 }
 
 }  // namespace blink