1 /* 2 * Copyright 2009 Red Hat, Inc. 3 * Copyright 2011 Google, Inc. 4 * 5 * This is part of HarfBuzz, a text shaping library. 6 * 7 * Permission is hereby granted, without written agreement and without 8 * license or royalty fees, to use, copy, modify, and distribute this 9 * software and its documentation for any purpose, provided that the 10 * above copyright notice and the following two paragraphs appear in 11 * all copies of this software. 12 * 13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 17 * DAMAGE. 18 * 19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 24 * 25 * Red Hat Author(s): Behdad Esfahbod 26 * Google Author(s): Behdad Esfahbod 27 */ 28 29 #ifndef HB_FONT_PRIVATE_HH 30 #define HB_FONT_PRIVATE_HH 31 32 #include "hb-private.hh" 33 34 #include "hb-object-private.hh" 35 #include "hb-face-private.hh" 36 #include "hb-shaper-private.hh" 37 38 39 40 /* 41 * hb_font_funcs_t 42 */ 43 44 #define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \ 45 HB_FONT_FUNC_IMPLEMENT (glyph) \ 46 HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \ 47 HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \ 48 HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \ 49 HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \ 50 HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \ 51 HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning) \ 52 HB_FONT_FUNC_IMPLEMENT (glyph_extents) \ 53 HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \ 54 HB_FONT_FUNC_IMPLEMENT (glyph_name) \ 55 HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \ 56 /* ^--- Add new callbacks here */ 57 58 struct hb_font_funcs_t { 59 hb_object_header_t header; 60 ASSERT_POD (); 61 62 hb_bool_t immutable; 63 64 /* Don't access these directly. Call hb_font_get_*() instead. */ 65 66 struct { 67 #define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name; 68 HB_FONT_FUNCS_IMPLEMENT_CALLBACKS 69 #undef HB_FONT_FUNC_IMPLEMENT 70 } get; 71 72 struct { 73 #define HB_FONT_FUNC_IMPLEMENT(name) void *name; 74 HB_FONT_FUNCS_IMPLEMENT_CALLBACKS 75 #undef HB_FONT_FUNC_IMPLEMENT 76 } user_data; 77 78 struct { 79 #define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name; 80 HB_FONT_FUNCS_IMPLEMENT_CALLBACKS 81 #undef HB_FONT_FUNC_IMPLEMENT 82 } destroy; 83 }; 84 85 86 87 /* 88 * hb_font_t 89 */ 90 91 struct hb_font_t { 92 hb_object_header_t header; 93 ASSERT_POD (); 94 95 hb_bool_t immutable; 96 97 hb_font_t *parent; 98 hb_face_t *face; 99 100 int x_scale; 101 int y_scale; 102 103 unsigned int x_ppem; 104 unsigned int y_ppem; 105 106 hb_font_funcs_t *klass; 107 void *user_data; 108 hb_destroy_func_t destroy; 109 110 struct hb_shaper_data_t shaper_data; 111 112 113 /* Convert from font-space to user-space */ 114 inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, this->x_scale); } 115 inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, this->y_scale); } 116 117 /* Convert from parent-font user-space to our user-space */ 118 inline hb_position_t parent_scale_x_distance (hb_position_t v) { 119 if (unlikely (parent && parent->x_scale != x_scale)) 120 return (hb_position_t) (v * (int64_t) this->x_scale / this->parent->x_scale); 121 return v; 122 } 123 inline hb_position_t parent_scale_y_distance (hb_position_t v) { 124 if (unlikely (parent && parent->y_scale != y_scale)) 125 return (hb_position_t) (v * (int64_t) this->y_scale / this->parent->y_scale); 126 return v; 127 } 128 inline hb_position_t parent_scale_x_position (hb_position_t v) { 129 return parent_scale_x_distance (v); 130 } 131 inline hb_position_t parent_scale_y_position (hb_position_t v) { 132 return parent_scale_y_distance (v); 133 } 134 135 inline void parent_scale_distance (hb_position_t *x, hb_position_t *y) { 136 *x = parent_scale_x_distance (*x); 137 *y = parent_scale_y_distance (*y); 138 } 139 inline void parent_scale_position (hb_position_t *x, hb_position_t *y) { 140 *x = parent_scale_x_position (*x); 141 *y = parent_scale_y_position (*y); 142 } 143 144 145 /* Public getters */ 146 147 inline hb_bool_t has_glyph (hb_codepoint_t unicode) 148 { 149 hb_codepoint_t glyph; 150 return get_glyph (unicode, 0, &glyph); 151 } 152 153 inline hb_bool_t get_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector, 154 hb_codepoint_t *glyph) 155 { 156 *glyph = 0; 157 return klass->get.glyph (this, user_data, 158 unicode, variation_selector, glyph, 159 klass->user_data.glyph); 160 } 161 162 inline hb_position_t get_glyph_h_advance (hb_codepoint_t glyph) 163 { 164 return klass->get.glyph_h_advance (this, user_data, 165 glyph, 166 klass->user_data.glyph_h_advance); 167 } 168 169 inline hb_position_t get_glyph_v_advance (hb_codepoint_t glyph) 170 { 171 return klass->get.glyph_v_advance (this, user_data, 172 glyph, 173 klass->user_data.glyph_v_advance); 174 } 175 176 inline hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph, 177 hb_position_t *x, hb_position_t *y) 178 { 179 *x = *y = 0; 180 return klass->get.glyph_h_origin (this, user_data, 181 glyph, x, y, 182 klass->user_data.glyph_h_origin); 183 } 184 185 inline hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph, 186 hb_position_t *x, hb_position_t *y) 187 { 188 *x = *y = 0; 189 return klass->get.glyph_v_origin (this, user_data, 190 glyph, x, y, 191 klass->user_data.glyph_v_origin); 192 } 193 194 inline hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph, hb_codepoint_t right_glyph) 195 { 196 return klass->get.glyph_h_kerning (this, user_data, 197 left_glyph, right_glyph, 198 klass->user_data.glyph_h_kerning); 199 } 200 201 inline hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph) 202 { 203 return klass->get.glyph_v_kerning (this, user_data, 204 top_glyph, bottom_glyph, 205 klass->user_data.glyph_v_kerning); 206 } 207 208 inline hb_bool_t get_glyph_extents (hb_codepoint_t glyph, 209 hb_glyph_extents_t *extents) 210 { 211 memset (extents, 0, sizeof (*extents)); 212 return klass->get.glyph_extents (this, user_data, 213 glyph, 214 extents, 215 klass->user_data.glyph_extents); 216 } 217 218 inline hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index, 219 hb_position_t *x, hb_position_t *y) 220 { 221 *x = *y = 0; 222 return klass->get.glyph_contour_point (this, user_data, 223 glyph, point_index, 224 x, y, 225 klass->user_data.glyph_contour_point); 226 } 227 228 inline hb_bool_t get_glyph_name (hb_codepoint_t glyph, 229 char *name, unsigned int size) 230 { 231 if (size) *name = '\0'; 232 return klass->get.glyph_name (this, user_data, 233 glyph, 234 name, size, 235 klass->user_data.glyph_name); 236 } 237 238 inline hb_bool_t get_glyph_from_name (const char *name, int len, /* -1 means nul-terminated */ 239 hb_codepoint_t *glyph) 240 { 241 *glyph = 0; 242 if (len == -1) len = strlen (name); 243 return klass->get.glyph_from_name (this, user_data, 244 name, len, 245 glyph, 246 klass->user_data.glyph_from_name); 247 } 248 249 250 /* A bit higher-level, and with fallback */ 251 252 inline void get_glyph_advance_for_direction (hb_codepoint_t glyph, 253 hb_direction_t direction, 254 hb_position_t *x, hb_position_t *y) 255 { 256 if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) { 257 *x = get_glyph_h_advance (glyph); 258 *y = 0; 259 } else { 260 *x = 0; 261 *y = get_glyph_v_advance (glyph); 262 } 263 } 264 265 /* Internal only */ 266 inline void guess_v_origin_minus_h_origin (hb_codepoint_t glyph, 267 hb_position_t *x, hb_position_t *y) 268 { 269 *x = get_glyph_h_advance (glyph) / 2; 270 271 /* TODO use font_metics.ascent */ 272 *y = y_scale; 273 } 274 275 inline void get_glyph_origin_for_direction (hb_codepoint_t glyph, 276 hb_direction_t direction, 277 hb_position_t *x, hb_position_t *y) 278 { 279 if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) 280 { 281 if (!get_glyph_h_origin (glyph, x, y) && 282 get_glyph_v_origin (glyph, x, y)) 283 { 284 hb_position_t dx, dy; 285 guess_v_origin_minus_h_origin (glyph, &dx, &dy); 286 *x -= dx; *y -= dy; 287 } 288 } 289 else 290 { 291 if (!get_glyph_v_origin (glyph, x, y) && 292 get_glyph_h_origin (glyph, x, y)) 293 { 294 hb_position_t dx, dy; 295 guess_v_origin_minus_h_origin (glyph, &dx, &dy); 296 *x += dx; *y += dy; 297 } 298 } 299 } 300 301 inline void add_glyph_origin_for_direction (hb_codepoint_t glyph, 302 hb_direction_t direction, 303 hb_position_t *x, hb_position_t *y) 304 { 305 hb_position_t origin_x, origin_y; 306 307 get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y); 308 309 *x += origin_x; 310 *y += origin_y; 311 } 312 313 inline void subtract_glyph_origin_for_direction (hb_codepoint_t glyph, 314 hb_direction_t direction, 315 hb_position_t *x, hb_position_t *y) 316 { 317 hb_position_t origin_x, origin_y; 318 319 get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y); 320 321 *x -= origin_x; 322 *y -= origin_y; 323 } 324 325 inline void get_glyph_kerning_for_direction (hb_codepoint_t first_glyph, hb_codepoint_t second_glyph, 326 hb_direction_t direction, 327 hb_position_t *x, hb_position_t *y) 328 { 329 if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) { 330 *x = get_glyph_h_kerning (first_glyph, second_glyph); 331 *y = 0; 332 } else { 333 *x = 0; 334 *y = get_glyph_v_kerning (first_glyph, second_glyph); 335 } 336 } 337 338 inline hb_bool_t get_glyph_extents_for_origin (hb_codepoint_t glyph, 339 hb_direction_t direction, 340 hb_glyph_extents_t *extents) 341 { 342 hb_bool_t ret = get_glyph_extents (glyph, extents); 343 344 if (ret) 345 subtract_glyph_origin_for_direction (glyph, direction, &extents->x_bearing, &extents->y_bearing); 346 347 return ret; 348 } 349 350 inline hb_bool_t get_glyph_contour_point_for_origin (hb_codepoint_t glyph, unsigned int point_index, 351 hb_direction_t direction, 352 hb_position_t *x, hb_position_t *y) 353 { 354 hb_bool_t ret = get_glyph_contour_point (glyph, point_index, x, y); 355 356 if (ret) 357 subtract_glyph_origin_for_direction (glyph, direction, x, y); 358 359 return ret; 360 } 361 362 /* Generates gidDDD if glyph has no name. */ 363 inline void 364 glyph_to_string (hb_codepoint_t glyph, 365 char *s, unsigned int size) 366 { 367 if (get_glyph_name (glyph, s, size)) return; 368 369 if (size && snprintf (s, size, "gid%u", glyph) < 0) 370 *s = '\0'; 371 } 372 373 /* Parses gidDDD and uniUUUU strings automatically. */ 374 inline hb_bool_t 375 glyph_from_string (const char *s, int len, /* -1 means nul-terminated */ 376 hb_codepoint_t *glyph) 377 { 378 if (get_glyph_from_name (s, len, glyph)) return true; 379 380 if (len == -1) len = strlen (s); 381 382 /* Straight glyph index. */ 383 if (hb_codepoint_parse (s, len, 10, glyph)) 384 return true; 385 386 if (len > 3) 387 { 388 /* gidDDD syntax for glyph indices. */ 389 if (0 == strncmp (s, "gid", 3) && 390 hb_codepoint_parse (s + 3, len - 3, 10, glyph)) 391 return true; 392 393 /* uniUUUU and other Unicode character indices. */ 394 hb_codepoint_t unichar; 395 if (0 == strncmp (s, "uni", 3) && 396 hb_codepoint_parse (s + 3, len - 3, 16, &unichar) && 397 get_glyph (unichar, 0, glyph)) 398 return true; 399 } 400 401 return false; 402 } 403 404 private: 405 inline hb_position_t em_scale (int16_t v, int scale) { return (hb_position_t) (v * (int64_t) scale / face->get_upem ()); } 406 }; 407 408 #define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS 409 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, font); 410 #include "hb-shaper-list.hh" 411 #undef HB_SHAPER_IMPLEMENT 412 #undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS 413 414 415 #endif /* HB_FONT_PRIVATE_HH */ 416
