1 /* 2 * Copyright 2016 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27 #ifndef HB_OT_POST_TABLE_HH 28 #define HB_OT_POST_TABLE_HH 29 30 #include "hb-open-type-private.hh" 31 #include "hb-dsalgs.hh" 32 33 #define HB_STRING_ARRAY_NAME format1_names 34 #define HB_STRING_ARRAY_LIST "hb-ot-post-macroman.hh" 35 #include "hb-string-array.hh" 36 #undef HB_STRING_ARRAY_LIST 37 #undef HB_STRING_ARRAY_NAME 38 39 #define NUM_FORMAT1_NAMES 258 40 41 namespace OT { 42 43 44 /* 45 * post -- PostScript 46 */ 47 48 #define HB_OT_TAG_post HB_TAG('p','o','s','t') 49 50 51 struct postV2Tail 52 { 53 inline bool sanitize (hb_sanitize_context_t *c) const 54 { 55 TRACE_SANITIZE (this); 56 return_trace (glyphNameIndex.sanitize (c)); 57 } 58 59 ArrayOf<UINT16>glyphNameIndex; /* This is not an offset, but is the 60 * ordinal number of the glyph in 'post' 61 * string tables. */ 62 UINT8 namesX[VAR]; /* Glyph names with length bytes [variable] 63 * (a Pascal string). */ 64 65 DEFINE_SIZE_ARRAY2 (2, glyphNameIndex, namesX); 66 }; 67 68 struct post 69 { 70 static const hb_tag_t tableTag = HB_OT_TAG_post; 71 72 inline bool sanitize (hb_sanitize_context_t *c) const 73 { 74 TRACE_SANITIZE (this); 75 if (unlikely (!c->check_struct (this))) 76 return_trace (false); 77 if (version.to_int () == 0x00020000) 78 { 79 const postV2Tail &v2 = StructAfter<postV2Tail> (*this); 80 return_trace (v2.sanitize (c)); 81 } 82 return_trace (true); 83 } 84 85 struct accelerator_t 86 { 87 inline void init (hb_face_t *face) 88 { 89 blob = Sanitizer<post>::sanitize (face->reference_table (HB_OT_TAG_post)); 90 const post *table = Sanitizer<post>::lock_instance (blob); 91 unsigned int table_length = hb_blob_get_length (blob); 92 93 version = table->version.to_int (); 94 index_to_offset.init (); 95 if (version != 0x00020000) 96 return; 97 98 const postV2Tail &v2 = StructAfter<postV2Tail> (*table); 99 100 glyphNameIndex = &v2.glyphNameIndex; 101 pool = &StructAfter<uint8_t> (v2.glyphNameIndex); 102 103 const uint8_t *end = (uint8_t *) table + table_length; 104 for (const uint8_t *data = pool; data < end && data + *data <= end; data += 1 + *data) 105 { 106 uint32_t *offset = index_to_offset.push (); 107 if (unlikely (!offset)) 108 break; 109 *offset = data - pool; 110 } 111 } 112 inline void fini (void) 113 { 114 index_to_offset.finish (); 115 free (gids_sorted_by_name); 116 } 117 118 inline bool get_glyph_name (hb_codepoint_t glyph, 119 char *buf, unsigned int buf_len) const 120 { 121 hb_string_t s = find_glyph_name (glyph); 122 if (!s.len) 123 return false; 124 if (!buf_len) 125 return true; 126 if (buf_len <= s.len) /* What to do with truncation? Returning false for now. */ 127 return false; 128 strncpy (buf, s.bytes, s.len); 129 buf[s.len] = '\0'; 130 return true; 131 } 132 133 inline bool get_glyph_from_name (const char *name, int len, 134 hb_codepoint_t *glyph) const 135 { 136 unsigned int count = get_glyph_count (); 137 if (unlikely (!count)) 138 return false; 139 140 if (len < 0) 141 len = strlen (name); 142 143 if (unlikely (!len)) 144 return false; 145 146 retry: 147 uint16_t *gids = (uint16_t *) hb_atomic_ptr_get (&gids_sorted_by_name); 148 149 if (unlikely (!gids)) 150 { 151 gids = (uint16_t *) malloc (count * sizeof (gids[0])); 152 if (unlikely (!gids)) 153 return false; /* Anything better?! */ 154 155 for (unsigned int i = 0; i < count; i++) 156 gids[i] = i; 157 hb_sort_r (gids, count, sizeof (gids[0]), cmp_gids, (void *) this); 158 159 if (!hb_atomic_ptr_cmpexch (&gids_sorted_by_name, nullptr, gids)) { 160 free (gids); 161 goto retry; 162 } 163 } 164 165 hb_string_t st (name, len); 166 const uint16_t *gid = (const uint16_t *) hb_bsearch_r (&st, gids, count, sizeof (gids[0]), cmp_key, (void *) this); 167 if (gid) 168 { 169 *glyph = *gid; 170 return true; 171 } 172 173 return false; 174 } 175 176 protected: 177 178 inline unsigned int get_glyph_count (void) const 179 { 180 if (version == 0x00010000) 181 return NUM_FORMAT1_NAMES; 182 183 if (version == 0x00020000) 184 return glyphNameIndex->len; 185 186 return 0; 187 } 188 189 static inline int cmp_gids (const void *pa, const void *pb, void *arg) 190 { 191 const accelerator_t *thiz = (const accelerator_t *) arg; 192 uint16_t a = * (const uint16_t *) pa; 193 uint16_t b = * (const uint16_t *) pb; 194 return thiz->find_glyph_name (b).cmp (thiz->find_glyph_name (a)); 195 } 196 197 static inline int cmp_key (const void *pk, const void *po, void *arg) 198 { 199 const accelerator_t *thiz = (const accelerator_t *) arg; 200 const hb_string_t *key = (const hb_string_t *) pk; 201 uint16_t o = * (const uint16_t *) po; 202 return thiz->find_glyph_name (o).cmp (*key); 203 } 204 205 inline hb_string_t find_glyph_name (hb_codepoint_t glyph) const 206 { 207 if (version == 0x00010000) 208 { 209 if (glyph >= NUM_FORMAT1_NAMES) 210 return hb_string_t (); 211 212 return format1_names (glyph); 213 } 214 215 if (version != 0x00020000 || glyph >= glyphNameIndex->len) 216 return hb_string_t (); 217 218 unsigned int index = glyphNameIndex->array[glyph]; 219 if (index < NUM_FORMAT1_NAMES) 220 return format1_names (index); 221 index -= NUM_FORMAT1_NAMES; 222 223 if (index >= index_to_offset.len) 224 return hb_string_t (); 225 unsigned int offset = index_to_offset.array[index]; 226 227 const uint8_t *data = pool + offset; 228 unsigned int name_length = *data; 229 data++; 230 231 return hb_string_t ((const char *) data, name_length); 232 } 233 234 private: 235 hb_blob_t *blob; 236 uint32_t version; 237 const ArrayOf<UINT16> *glyphNameIndex; 238 hb_prealloced_array_t<uint32_t, 1> index_to_offset; 239 const uint8_t *pool; 240 mutable uint16_t *gids_sorted_by_name; 241 }; 242 243 public: 244 FixedVersion<>version; /* 0x00010000 for version 1.0 245 * 0x00020000 for version 2.0 246 * 0x00025000 for version 2.5 (deprecated) 247 * 0x00030000 for version 3.0 */ 248 Fixed italicAngle; /* Italic angle in counter-clockwise degrees 249 * from the vertical. Zero for upright text, 250 * negative for text that leans to the right 251 * (forward). */ 252 FWORD underlinePosition; /* This is the suggested distance of the top 253 * of the underline from the baseline 254 * (negative values indicate below baseline). 255 * The PostScript definition of this FontInfo 256 * dictionary key (the y coordinate of the 257 * center of the stroke) is not used for 258 * historical reasons. The value of the 259 * PostScript key may be calculated by 260 * subtracting half the underlineThickness 261 * from the value of this field. */ 262 FWORD underlineThickness; /* Suggested values for the underline 263 thickness. */ 264 UINT32 isFixedPitch; /* Set to 0 if the font is proportionally 265 * spaced, non-zero if the font is not 266 * proportionally spaced (i.e. monospaced). */ 267 UINT32 minMemType42; /* Minimum memory usage when an OpenType font 268 * is downloaded. */ 269 UINT32 maxMemType42; /* Maximum memory usage when an OpenType font 270 * is downloaded. */ 271 UINT32 minMemType1; /* Minimum memory usage when an OpenType font 272 * is downloaded as a Type 1 font. */ 273 UINT32 maxMemType1; /* Maximum memory usage when an OpenType font 274 * is downloaded as a Type 1 font. */ 275 /*postV2Tail v2[VAR];*/ 276 DEFINE_SIZE_STATIC (32); 277 }; 278 279 } /* namespace OT */ 280 281 282 #endif /* HB_OT_POST_TABLE_HH */ 283
