Roll HarfBuzz to 1.3.0

third_party/harfbuzz-ng/src/hb-ot-font.cc

 /*
  * Copyright © 2011,2014  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
@@ skipping 197 matching lines @@
 
 template <typename Type>
 static inline bool get_glyph_from (const void *obj,
                                    hb_codepoint_t codepoint,
                                    hb_codepoint_t *glyph)
 {
   const Type *typed_obj = (const Type *) obj;
   return typed_obj->get_glyph (codepoint, glyph);
 }
 
+template <typename Type>
+static inline bool get_glyph_from_symbol (const void *obj,
+                                          hb_codepoint_t codepoint,
+                                          hb_codepoint_t *glyph)
+{
+  const Type *typed_obj = (const Type *) obj;
+  if (likely (typed_obj->get_glyph (codepoint, glyph)))
+    return true;
+
+  if (codepoint <= 0x00FFu)
+  {
+    /* For symbol-encoded OpenType fonts, we duplicate the
+     * U+F000..F0FF range at U+0000..U+00FF.  That's what
+     * Windows seems to do, and that's hinted about at:
+     * http://www.microsoft.com/typography/otspec/recom.htm
+     * under "Non-Standard (Symbol) Fonts". */
+    return typed_obj->get_glyph (0xF000u + codepoint, glyph);
+  }
+
+  return false;
+}
+
 struct hb_ot_face_cmap_accelerator_t
 {
   hb_cmap_get_glyph_func_t get_glyph_func;
   const void *get_glyph_data;
   OT::CmapSubtableFormat4::accelerator_t format4_accel;
 
   const OT::CmapSubtableFormat14 *uvs_table;
   hb_blob_t *blob;
 
   inline void init (hb_face_t *face)
   {
     this->blob = OT::Sanitizer<OT::cmap>::sanitize (face->reference_table (HB_OT_TAG_cmap));
     const OT::cmap *cmap = OT::Sanitizer<OT::cmap>::lock_instance (this->blob);
     const OT::CmapSubtable *subtable = NULL;
     const OT::CmapSubtableFormat14 *subtable_uvs = NULL;
 
+    bool symbol = false;
     /* 32-bit subtables. */
     if (!subtable) subtable = cmap->find_subtable (3, 10);
     if (!subtable) subtable = cmap->find_subtable (0, 6);
     if (!subtable) subtable = cmap->find_subtable (0, 4);
     /* 16-bit subtables. */
     if (!subtable) subtable = cmap->find_subtable (3, 1);
     if (!subtable) subtable = cmap->find_subtable (0, 3);
     if (!subtable) subtable = cmap->find_subtable (0, 2);
     if (!subtable) subtable = cmap->find_subtable (0, 1);
     if (!subtable) subtable = cmap->find_subtable (0, 0);
-    if (!subtable) subtable = cmap->find_subtable (3, 0);
+    if (!subtable)(subtable = cmap->find_subtable (3, 0)) && (symbol = true);
     /* Meh. */
     if (!subtable) subtable = &OT::Null(OT::CmapSubtable);
 
     /* UVS subtable. */
     if (!subtable_uvs)
     {
       const OT::CmapSubtable *st = cmap->find_subtable (0, 5);
       if (st && st->u.format == 14)
         subtable_uvs = &st->u.format14;
     }
     /* Meh. */
     if (!subtable_uvs) subtable_uvs = &OT::Null(OT::CmapSubtableFormat14);
 
     this->uvs_table = subtable_uvs;
 
     this->get_glyph_data = subtable;
-    switch (subtable->u.format) {
-    /* Accelerate format 4 and format 12. */
-    default: this->get_glyph_func = get_glyph_from<OT::CmapSubtable>;           break;
-    case 12: this->get_glyph_func = get_glyph_from<OT::CmapSubtableFormat12>;   break;
-    case  4:
-      {
-        this->format4_accel.init (&subtable->u.format4);
-        this->get_glyph_data = &this->format4_accel;
-        this->get_glyph_func = this->format4_accel.get_glyph_func;
+    if (unlikely (symbol))
+      this->get_glyph_func = get_glyph_from_symbol<OT::CmapSubtable>;
+    else
+      switch (subtable->u.format) {
+      /* Accelerate format 4 and format 12. */
+      default: this->get_glyph_func = get_glyph_from<OT::CmapSubtable>;         break;
+      case 12: this->get_glyph_func = get_glyph_from<OT::CmapSubtableFormat12>; break;
+      case  4:
+        {
+          this->format4_accel.init (&subtable->u.format4);
+          this->get_glyph_data = &this->format4_accel;
+          this->get_glyph_func = this->format4_accel.get_glyph_func;
+        }
+        break;
       }
-      break;
-    }
   }
 
   inline void fini (void)
   {
     hb_blob_destroy (this->blob);
   }
 
   inline bool get_nominal_glyph (hb_codepoint_t  unicode,
                                  hb_codepoint_t *glyph) const
   {
@@ skipping 243 matching lines @@
 {
   hb_ot_font_t *ot_font = _hb_ot_font_create (font->face);
   if (unlikely (!ot_font))
     return;
 
   hb_font_set_funcs (font,
                      _hb_ot_get_font_funcs (),
                      ot_font,
                      (hb_destroy_func_t) _hb_ot_font_destroy);
 }