CompositeGlyph.hh (11667B)
1 #ifndef OT_GLYF_COMPOSITEGLYPH_HH 2 #define OT_GLYF_COMPOSITEGLYPH_HH 3 4 5 #include "../../hb-open-type.hh" 6 #include "composite-iter.hh" 7 8 9 namespace OT { 10 namespace glyf_impl { 11 12 13 struct CompositeGlyphRecord 14 { 15 protected: 16 enum composite_glyph_flag_t 17 { 18 ARG_1_AND_2_ARE_WORDS = 0x0001, 19 ARGS_ARE_XY_VALUES = 0x0002, 20 ROUND_XY_TO_GRID = 0x0004, 21 WE_HAVE_A_SCALE = 0x0008, 22 MORE_COMPONENTS = 0x0020, 23 WE_HAVE_AN_X_AND_Y_SCALE = 0x0040, 24 WE_HAVE_A_TWO_BY_TWO = 0x0080, 25 WE_HAVE_INSTRUCTIONS = 0x0100, 26 USE_MY_METRICS = 0x0200, 27 OVERLAP_COMPOUND = 0x0400, 28 SCALED_COMPONENT_OFFSET = 0x0800, 29 UNSCALED_COMPONENT_OFFSET = 0x1000, 30 #ifndef HB_NO_BEYOND_64K 31 GID_IS_24BIT = 0x2000 32 #endif 33 }; 34 35 public: 36 unsigned int get_size () const 37 { 38 unsigned int size = min_size; 39 /* glyphIndex is 24bit instead of 16bit */ 40 #ifndef HB_NO_BEYOND_64K 41 if (flags & GID_IS_24BIT) size += HBGlyphID24::static_size - HBGlyphID16::static_size; 42 #endif 43 /* arg1 and 2 are int16 */ 44 if (flags & ARG_1_AND_2_ARE_WORDS) size += 4; 45 /* arg1 and 2 are int8 */ 46 else size += 2; 47 48 /* One x 16 bit (scale) */ 49 if (flags & WE_HAVE_A_SCALE) size += 2; 50 /* Two x 16 bit (xscale, yscale) */ 51 else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) size += 4; 52 /* Four x 16 bit (xscale, scale01, scale10, yscale) */ 53 else if (flags & WE_HAVE_A_TWO_BY_TWO) size += 8; 54 55 return size; 56 } 57 58 void drop_instructions_flag () { flags = (uint16_t) flags & ~WE_HAVE_INSTRUCTIONS; } 59 void set_overlaps_flag () 60 { 61 flags = (uint16_t) flags | OVERLAP_COMPOUND; 62 } 63 64 bool has_instructions () const { return flags & WE_HAVE_INSTRUCTIONS; } 65 66 bool has_more () const { return flags & MORE_COMPONENTS; } 67 bool is_use_my_metrics () const { return flags & USE_MY_METRICS; } 68 bool is_anchored () const { return !(flags & ARGS_ARE_XY_VALUES); } 69 void get_anchor_points (unsigned int &point1, unsigned int &point2) const 70 { 71 const auto *p = &StructAfter<const HBUINT8> (flags); 72 #ifndef HB_NO_BEYOND_64K 73 if (flags & GID_IS_24BIT) 74 p += HBGlyphID24::static_size; 75 else 76 #endif 77 p += HBGlyphID16::static_size; 78 if (flags & ARG_1_AND_2_ARE_WORDS) 79 { 80 point1 = ((const HBUINT16 *) p)[0]; 81 point2 = ((const HBUINT16 *) p)[1]; 82 } 83 else 84 { 85 point1 = p[0]; 86 point2 = p[1]; 87 } 88 } 89 90 static void transform (const float (&matrix)[4], 91 hb_array_t<contour_point_t> points) 92 { 93 if (matrix[0] != 1.f || matrix[1] != 0.f || 94 matrix[2] != 0.f || matrix[3] != 1.f) 95 for (auto &point : points) 96 point.transform (matrix); 97 } 98 99 static void translate (const contour_point_t &trans, 100 hb_array_t<contour_point_t> points) 101 { 102 if (HB_OPTIMIZE_SIZE_VAL) 103 { 104 if (trans.x != 0.f || trans.y != 0.f) 105 for (auto &point : points) 106 point.translate (trans); 107 } 108 else 109 { 110 if (trans.x != 0.f && trans.y != 0.f) 111 for (auto &point : points) 112 point.translate (trans); 113 else 114 { 115 if (trans.x != 0.f) 116 for (auto &point : points) 117 point.x += trans.x; 118 else if (trans.y != 0.f) 119 for (auto &point : points) 120 point.y += trans.y; 121 } 122 } 123 } 124 125 void transform_points (hb_array_t<contour_point_t> points, 126 const float (&matrix)[4], 127 const contour_point_t &trans) const 128 { 129 if (scaled_offsets ()) 130 { 131 translate (trans, points); 132 transform (matrix, points); 133 } 134 else 135 { 136 transform (matrix, points); 137 translate (trans, points); 138 } 139 } 140 141 bool get_points (contour_point_vector_t &points) const 142 { 143 float matrix[4]; 144 contour_point_t trans; 145 get_transformation (matrix, trans); 146 if (unlikely (!points.alloc (points.length + 1 + 4))) return false; // For phantom points 147 points.push (trans); 148 return true; 149 } 150 151 unsigned compile_with_point (const contour_point_t &point, 152 char *out) const 153 { 154 const HBINT8 *p = &StructAfter<const HBINT8> (flags); 155 #ifndef HB_NO_BEYOND_64K 156 if (flags & GID_IS_24BIT) 157 p += HBGlyphID24::static_size; 158 else 159 #endif 160 p += HBGlyphID16::static_size; 161 162 unsigned len = get_size (); 163 unsigned len_before_val = (const char *)p - (const char *)this; 164 if (flags & ARG_1_AND_2_ARE_WORDS) 165 { 166 // no overflow, copy value 167 hb_memcpy (out, this, len); 168 169 HBINT16 *o = reinterpret_cast<HBINT16 *> (out + len_before_val); 170 o[0] = roundf (point.x); 171 o[1] = roundf (point.y); 172 } 173 else 174 { 175 int new_x = roundf (point.x); 176 int new_y = roundf (point.y); 177 if (new_x <= 127 && new_x >= -128 && 178 new_y <= 127 && new_y >= -128) 179 { 180 hb_memcpy (out, this, len); 181 HBINT8 *o = reinterpret_cast<HBINT8 *> (out + len_before_val); 182 o[0] = new_x; 183 o[1] = new_y; 184 } 185 else 186 { 187 // new point value has an int8 overflow 188 hb_memcpy (out, this, len_before_val); 189 190 //update flags 191 CompositeGlyphRecord *o = reinterpret_cast<CompositeGlyphRecord *> (out); 192 o->flags = flags | ARG_1_AND_2_ARE_WORDS; 193 out += len_before_val; 194 195 HBINT16 new_value; 196 new_value = new_x; 197 hb_memcpy (out, &new_value, HBINT16::static_size); 198 out += HBINT16::static_size; 199 200 new_value = new_y; 201 hb_memcpy (out, &new_value, HBINT16::static_size); 202 out += HBINT16::static_size; 203 204 hb_memcpy (out, p+2, len - len_before_val - 2); 205 len += 2; 206 } 207 } 208 return len; 209 } 210 211 protected: 212 bool scaled_offsets () const 213 { return (flags & (SCALED_COMPONENT_OFFSET | UNSCALED_COMPONENT_OFFSET)) == SCALED_COMPONENT_OFFSET; } 214 215 public: 216 bool get_transformation (float (&matrix)[4], contour_point_t &trans) const 217 { 218 matrix[0] = matrix[3] = 1.f; 219 matrix[1] = matrix[2] = 0.f; 220 221 const auto *p = &StructAfter<const HBINT8> (flags); 222 #ifndef HB_NO_BEYOND_64K 223 if (flags & GID_IS_24BIT) 224 p += HBGlyphID24::static_size; 225 else 226 #endif 227 p += HBGlyphID16::static_size; 228 int tx, ty; 229 if (flags & ARG_1_AND_2_ARE_WORDS) 230 { 231 tx = *(const HBINT16 *) p; 232 p += HBINT16::static_size; 233 ty = *(const HBINT16 *) p; 234 p += HBINT16::static_size; 235 } 236 else 237 { 238 tx = *p++; 239 ty = *p++; 240 } 241 if (is_anchored ()) tx = ty = 0; 242 243 /* set is_end_point flag to true, used by IUP delta optimization */ 244 trans.init ((float) tx, (float) ty, true); 245 246 { 247 const F2DOT14 *points = (const F2DOT14 *) p; 248 if (flags & WE_HAVE_A_SCALE) 249 { 250 matrix[0] = matrix[3] = points[0].to_float (); 251 return true; 252 } 253 else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) 254 { 255 matrix[0] = points[0].to_float (); 256 matrix[3] = points[1].to_float (); 257 return true; 258 } 259 else if (flags & WE_HAVE_A_TWO_BY_TWO) 260 { 261 matrix[0] = points[0].to_float (); 262 matrix[1] = points[1].to_float (); 263 matrix[2] = points[2].to_float (); 264 matrix[3] = points[3].to_float (); 265 return true; 266 } 267 } 268 return tx || ty; 269 } 270 271 hb_codepoint_t get_gid () const 272 { 273 #ifndef HB_NO_BEYOND_64K 274 if (flags & GID_IS_24BIT) 275 return StructAfter<const HBGlyphID24> (flags); 276 else 277 #endif 278 return StructAfter<const HBGlyphID16> (flags); 279 } 280 void set_gid (hb_codepoint_t gid) 281 { 282 #ifndef HB_NO_BEYOND_64K 283 if (flags & GID_IS_24BIT) 284 StructAfter<HBGlyphID24> (flags) = gid; 285 else 286 #endif 287 /* TODO assert? */ 288 StructAfter<HBGlyphID16> (flags) = gid; 289 } 290 291 #ifndef HB_NO_BEYOND_64K 292 void lower_gid_24_to_16 () 293 { 294 hb_codepoint_t gid = get_gid (); 295 if (!(flags & GID_IS_24BIT) || gid > 0xFFFFu) 296 return; 297 298 /* Lower the flag and move the rest of the struct down. */ 299 300 unsigned size = get_size (); 301 char *end = (char *) this + size; 302 char *p = &StructAfter<char> (flags); 303 p += HBGlyphID24::static_size; 304 305 flags = flags & ~GID_IS_24BIT; 306 set_gid (gid); 307 308 memmove (p - HBGlyphID24::static_size + HBGlyphID16::static_size, p, end - p); 309 } 310 #endif 311 312 protected: 313 HBUINT16 flags; 314 HBUINT24 pad; 315 public: 316 DEFINE_SIZE_MIN (4); 317 }; 318 319 using composite_iter_t = composite_iter_tmpl<CompositeGlyphRecord>; 320 321 struct CompositeGlyph 322 { 323 const GlyphHeader &header; 324 hb_bytes_t bytes; 325 CompositeGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) : 326 header (header_), bytes (bytes_) {} 327 328 composite_iter_t iter () const 329 { return composite_iter_t (bytes, &StructAfter<CompositeGlyphRecord, GlyphHeader> (header)); } 330 331 unsigned int instructions_length (hb_bytes_t bytes) const 332 { 333 unsigned int start = bytes.length; 334 unsigned int end = bytes.length; 335 const CompositeGlyphRecord *last = nullptr; 336 for (auto &item : iter ()) 337 last = &item; 338 if (unlikely (!last)) return 0; 339 340 if (last->has_instructions ()) 341 start = (char *) last - &bytes + last->get_size (); 342 if (unlikely (start > end)) return 0; 343 return end - start; 344 } 345 346 /* Trimming for composites not implemented. 347 * If removing hints it falls out of that. */ 348 const hb_bytes_t trim_padding () const { return bytes; } 349 350 void drop_hints () 351 { 352 for (const auto &_ : iter ()) 353 const_cast<CompositeGlyphRecord &> (_).drop_instructions_flag (); 354 } 355 356 /* Chop instructions off the end */ 357 void drop_hints_bytes (hb_bytes_t &dest_start) const 358 { dest_start = bytes.sub_array (0, bytes.length - instructions_length (bytes)); } 359 360 void set_overlaps_flag () 361 { 362 CompositeGlyphRecord& glyph_chain = const_cast<CompositeGlyphRecord &> ( 363 StructAfter<CompositeGlyphRecord, GlyphHeader> (header)); 364 if (!bytes.check_range(&glyph_chain, CompositeGlyphRecord::min_size)) 365 return; 366 glyph_chain.set_overlaps_flag (); 367 } 368 369 bool compile_bytes_with_deltas (const hb_bytes_t &source_bytes, 370 const contour_point_vector_t &points_with_deltas, 371 hb_bytes_t &dest_bytes /* OUT */) 372 { 373 if (source_bytes.length <= GlyphHeader::static_size || 374 header.numberOfContours != -1) 375 { 376 dest_bytes = hb_bytes_t (); 377 return true; 378 } 379 380 unsigned source_len = source_bytes.length - GlyphHeader::static_size; 381 382 /* try to allocate more memories than source glyph bytes 383 * in case that there might be an overflow for int8 value 384 * and we would need to use int16 instead */ 385 char *o = (char *) hb_calloc (source_len * 2, sizeof (char)); 386 if (unlikely (!o)) return false; 387 388 const CompositeGlyphRecord *c = reinterpret_cast<const CompositeGlyphRecord *> (source_bytes.arrayZ + GlyphHeader::static_size); 389 auto it = composite_iter_t (hb_bytes_t ((const char *)c, source_len), c); 390 391 char *p = o; 392 unsigned i = 0, source_comp_len = 0; 393 for (const auto &component : it) 394 { 395 /* last 4 points in points_with_deltas are phantom points and should not be included */ 396 if (i >= points_with_deltas.length - 4) { 397 hb_free (o); 398 return false; 399 } 400 401 unsigned comp_len = component.get_size (); 402 if (component.is_anchored ()) 403 { 404 hb_memcpy (p, &component, comp_len); 405 p += comp_len; 406 } 407 else 408 { 409 unsigned new_len = component.compile_with_point (points_with_deltas[i], p); 410 p += new_len; 411 } 412 i++; 413 source_comp_len += comp_len; 414 } 415 416 //copy instructions if any 417 if (source_len > source_comp_len) 418 { 419 unsigned instr_len = source_len - source_comp_len; 420 hb_memcpy (p, (const char *)c + source_comp_len, instr_len); 421 p += instr_len; 422 } 423 424 unsigned len = p - o; 425 dest_bytes = hb_bytes_t (o, len); 426 return true; 427 } 428 }; 429 430 431 } /* namespace glyf_impl */ 432 } /* namespace OT */ 433 434 435 #endif /* OT_GLYF_COMPOSITEGLYPH_HH */