Branch
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690
/*
* Copyright © 2017 Google, Inc.
* Copyright © 2019 Facebook, 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.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
* Facebook Author(s): Behdad Esfahbod
*/
#ifndef HB_ALGS_HH
#define HB_ALGS_HH
#include "hb.hh"
#include "hb-meta.hh"
#include "hb-null.hh"
#include "hb-number.hh"
#include <algorithm>
#include <initializer_list>
#include <functional>
#include <new>
/*
* Flags
*/
/* Enable bitwise ops on enums marked as flags_t */
/* To my surprise, looks like the function resolver is happy to silently cast
* one enum to another... So this doesn't provide the type-checking that I
* originally had in mind... :(.
*
* For MSVC warnings, see: https://github.com/harfbuzz/harfbuzz/pull/163
*/
#ifdef _MSC_VER
# pragma warning(disable:4200)
# pragma warning(disable:4800)
#endif
#define HB_MARK_AS_FLAG_T(T) \
extern "C++" { \
static inline constexpr T operator | (T l, T r) { return T ((unsigned) l | (unsigned) r); } \
static inline constexpr T operator & (T l, T r) { return T ((unsigned) l & (unsigned) r); } \
static inline constexpr T operator ^ (T l, T r) { return T ((unsigned) l ^ (unsigned) r); } \
static inline constexpr unsigned operator ~ (T r) { return (~(unsigned) r); } \
static inline T& operator |= (T &l, T r) { l = l | r; return l; } \
static inline T& operator &= (T& l, T r) { l = l & r; return l; } \
static inline T& operator ^= (T& l, T r) { l = l ^ r; return l; } \
} \
static_assert (true, "")
/* Useful for set-operations on small enums.
* For example, for testing "x ∈ {x1, x2, x3}" use:
* (FLAG_UNSAFE(x) & (FLAG(x1) | FLAG(x2) | FLAG(x3)))
*/
#define FLAG(x) (static_assert_expr ((unsigned)(x) < 32) + (((uint32_t) 1U) << (unsigned)(x)))
#define FLAG_UNSAFE(x) ((unsigned)(x) < 32 ? (((uint32_t) 1U) << (unsigned)(x)) : 0)
#define FLAG_RANGE(x,y) (static_assert_expr ((x) < (y)) + FLAG(y+1) - FLAG(x))
#define FLAG64(x) (static_assert_expr ((unsigned)(x) < 64) + (((uint64_t) 1ULL) << (unsigned)(x)))
#define FLAG64_UNSAFE(x) ((unsigned)(x) < 64 ? (((uint64_t) 1ULL) << (unsigned)(x)) : 0)
/*
* Fixed-endian integers / floats.
*/
/* Endian swap, used in Windows related backends */
static inline constexpr uint16_t hb_uint16_swap (uint16_t v)
{ return (v >> 8) | (v << 8); }
static inline constexpr uint32_t hb_uint32_swap (uint32_t v)
{ return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); }
template <typename Type>
struct __attribute__((packed)) hb_packed_t { Type v; };
#ifndef HB_FAST_NUM_ACCESS
#if defined(__OPTIMIZE__) && \
defined(__BYTE_ORDER) && \
(__BYTE_ORDER == __BIG_ENDIAN || \
(__BYTE_ORDER == __LITTLE_ENDIAN && \
hb_has_builtin(__builtin_bswap16) && \
hb_has_builtin(__builtin_bswap32)))
#define HB_FAST_NUM_ACCESS 1
#else
#define HB_FAST_NUM_ACCESS 0
#endif
// https://github.com/harfbuzz/harfbuzz/issues/5456
#if defined(__GNUC__) && !defined(__clang__) && (__GNUC__ <= 12)
#undef HB_FAST_NUM_ACCESS
#define HB_FAST_NUM_ACCESS 0
#endif
#endif
template <bool BE, typename Type, int Bytes = sizeof (Type)>
struct HBInt;
template <bool BE, typename Type>
struct HBInt<BE, Type, 1>
{
public:
HBInt () = default;
constexpr HBInt (Type V) : v {uint8_t (V)} {}
constexpr operator Type () const { return v; }
private: uint8_t v;
};
template <bool BE, typename Type>
struct HBInt<BE, Type, 2>
{
public:
HBInt () = default;
HBInt (Type V)
#if HB_FAST_NUM_ACCESS
{
if (BE == (__BYTE_ORDER == __BIG_ENDIAN))
((hb_packed_t<uint16_t> *) v)->v = V;
else
((hb_packed_t<uint16_t> *) v)->v = __builtin_bswap16 (V);
}
#else
: v {BE ? uint8_t ((V >> 8) & 0xFF) : uint8_t ((V ) & 0xFF),
BE ? uint8_t ((V ) & 0xFF) : uint8_t ((V >> 8) & 0xFF)} {}
#endif
constexpr operator Type () const
{
#if HB_FAST_NUM_ACCESS
return (BE == (__BYTE_ORDER == __BIG_ENDIAN)) ?
((const hb_packed_t<uint16_t> *) v)->v
:
__builtin_bswap16 (((const hb_packed_t<uint16_t> *) v)->v)
;
#else
return (BE ? (v[0] << 8) : (v[0] ))
+ (BE ? (v[1] ) : (v[1] << 8));
#endif
}
private: uint8_t v[2];
};
template <bool BE, typename Type>
struct HBInt<BE, Type, 3>
{
static_assert (!std::is_signed<Type>::value, "");
public:
HBInt () = default;
constexpr HBInt (Type V) : v {BE ? uint8_t ((V >> 16) & 0xFF) : uint8_t ((V >> 16) & 0xFF),
BE ? uint8_t ((V >> 8) & 0xFF) : uint8_t ((V >> 8) & 0xFF),
BE ? uint8_t ((V ) & 0xFF) : uint8_t ((V ) & 0xFF)} {}
constexpr operator Type () const { return (BE ? (v[0] << 16) : (v[0] ))
+ (BE ? (v[1] << 8) : (v[1] << 8))
+ (BE ? (v[2] ) : (v[2] << 16)); }
private: uint8_t v[3];
};
template <bool BE, typename Type>
struct HBInt<BE, Type, 4>
{
template <bool, typename, int>
friend struct HBFloat;
public:
HBInt () = default;
HBInt (Type V)
#if HB_FAST_NUM_ACCESS
{
if (BE == (__BYTE_ORDER == __BIG_ENDIAN))
((hb_packed_t<uint32_t> *) v)->v = V;
else
((hb_packed_t<uint32_t> *) v)->v = __builtin_bswap32 (V);
}
#else
: v {BE ? uint8_t ((V >> 24) & 0xFF) : uint8_t ((V ) & 0xFF),
BE ? uint8_t ((V >> 16) & 0xFF) : uint8_t ((V >> 8) & 0xFF),
BE ? uint8_t ((V >> 8) & 0xFF) : uint8_t ((V >> 16) & 0xFF),
BE ? uint8_t ((V ) & 0xFF) : uint8_t ((V >> 24) & 0xFF)} {}
#endif
constexpr operator Type () const {
#if HB_FAST_NUM_ACCESS
return (BE == (__BYTE_ORDER == __BIG_ENDIAN)) ?
((const hb_packed_t<uint32_t> *) v)->v
:
__builtin_bswap32 (((const hb_packed_t<uint32_t> *) v)->v)
;
#else
return (BE ? (v[0] << 24) : (v[0] ))
+ (BE ? (v[1] << 16) : (v[1] << 8))
+ (BE ? (v[2] << 8) : (v[2] << 16))
+ (BE ? (v[3] ) : (v[3] << 24));
#endif
}
private: uint8_t v[4];
};
template <bool BE, typename Type>
struct HBInt<BE, Type, 8>
{
template <bool, typename, int>
friend struct HBFloat;
public:
HBInt () = default;
HBInt (Type V)
: v {BE ? uint8_t ((V >> 56) & 0xFF) : uint8_t ((V ) & 0xFF),
BE ? uint8_t ((V >> 48) & 0xFF) : uint8_t ((V >> 8) & 0xFF),
BE ? uint8_t ((V >> 40) & 0xFF) : uint8_t ((V >> 16) & 0xFF),
BE ? uint8_t ((V >> 32) & 0xFF) : uint8_t ((V >> 24) & 0xFF),
BE ? uint8_t ((V >> 24) & 0xFF) : uint8_t ((V >> 32) & 0xFF),
BE ? uint8_t ((V >> 16) & 0xFF) : uint8_t ((V >> 40) & 0xFF),
BE ? uint8_t ((V >> 8) & 0xFF) : uint8_t ((V >> 48) & 0xFF),
BE ? uint8_t ((V ) & 0xFF) : uint8_t ((V >> 56) & 0xFF)} {}
constexpr operator Type () const {
return (BE ? (uint64_t (v[0]) << 56) : (uint64_t (v[0]) ))
+ (BE ? (uint64_t (v[1]) << 48) : (uint64_t (v[1]) << 8))
+ (BE ? (uint64_t (v[2]) << 40) : (uint64_t (v[2]) << 16))
+ (BE ? (uint64_t (v[3]) << 32) : (uint64_t (v[3]) << 24))
+ (BE ? (uint64_t (v[4]) << 24) : (uint64_t (v[4]) << 32))
+ (BE ? (uint64_t (v[5]) << 16) : (uint64_t (v[5]) << 40))
+ (BE ? (uint64_t (v[6]) << 8) : (uint64_t (v[6]) << 48))
+ (BE ? (uint64_t (v[7]) ) : (uint64_t (v[7]) << 56));
}
private: uint8_t v[8];
};
/* Floats. */
template <bool BE, typename Type, int Bytes>
struct HBFloat
{
using IntType = typename std::conditional<Bytes == 4, uint32_t, uint64_t>::type;
public:
HBFloat () = default;
HBFloat (Type V)
{
#if HB_FAST_NUM_ACCESS
{
if (BE == (__BYTE_ORDER == __BIG_ENDIAN))
{
((hb_packed_t<Type> *) v)->v = V;
return;
}
}
#endif
union {
hb_packed_t<Type> f;
hb_packed_t<IntType> i;
} u = {{V}};
const HBInt<BE, IntType> I = u.i.v;
for (unsigned i = 0; i < Bytes; i++)
v[i] = I.v[i];
}
/* c++14 constexpr */ operator Type () const
{
#if HB_FAST_NUM_ACCESS
{
if (BE == (__BYTE_ORDER == __BIG_ENDIAN))
return ((const hb_packed_t<Type> *) v)->v;
}
#endif
HBInt<BE, IntType> I;
for (unsigned i = 0; i < Bytes; i++)
I.v[i] = v[i];
union {
hb_packed_t<IntType> i;
hb_packed_t<Type> f;
} u = {{I}};
return u.f.v;
}
private: uint8_t v[Bytes];
};
/* We want our rounding towards +infinity. */
static inline double
_hb_roundf (double x) { return floor (x + .5); }
static inline float
_hb_roundf (float x) { return floorf (x + .5f); }
#define roundf(x) _hb_roundf(x)
static inline void
hb_sincos (float rotation, float &s, float &c)
{
#ifdef HAVE_SINCOSF
sincosf (rotation, &s, &c);
#else
c = cosf (rotation);
s = sinf (rotation);
#endif
}
static inline void
hb_sincos (double rotation, double &s, double &c)
{
#ifdef HAVE_SINCOS
sincos (rotation, &s, &c);
#else
c = cos (rotation);
s = sin (rotation);
#endif
}
/* Encodes three unsigned integers in one 64-bit number. If the inputs have more than 21 bits,
* values will be truncated / overlap, and might not decode exactly. */
#define HB_CODEPOINT_ENCODE3(x,y,z) (((uint64_t) (x) << 42) | ((uint64_t) (y) << 21) | (uint64_t) (z))
#define HB_CODEPOINT_DECODE3_1(v) ((hb_codepoint_t) ((v) >> 42))
#define HB_CODEPOINT_DECODE3_2(v) ((hb_codepoint_t) ((v) >> 21) & 0x1FFFFFu)
#define HB_CODEPOINT_DECODE3_3(v) ((hb_codepoint_t) (v) & 0x1FFFFFu)
/* Custom encoding used by hb-ucd. */
#define HB_CODEPOINT_ENCODE3_11_7_14(x,y,z) (((uint32_t) ((x) & 0x07FFu) << 21) | (((uint32_t) (y) & 0x007Fu) << 14) | (uint32_t) ((z) & 0x3FFFu))
#define HB_CODEPOINT_DECODE3_11_7_14_1(v) ((hb_codepoint_t) ((v) >> 21))
#define HB_CODEPOINT_DECODE3_11_7_14_2(v) ((hb_codepoint_t) (((v) >> 14) & 0x007Fu) | 0x0300)
#define HB_CODEPOINT_DECODE3_11_7_14_3(v) ((hb_codepoint_t) (v) & 0x3FFFu)
struct
{
/* Note. This is dangerous in that if it's passed an rvalue, it returns rvalue-reference. */
template <typename T> constexpr auto
operator () (T&& v) const HB_AUTO_RETURN ( std::forward<T> (v) )
}
HB_FUNCOBJ (hb_identity);
struct
{
/* Like identity(), but only retains lvalue-references. Rvalues are returned as rvalues. */
template <typename T> constexpr T&
operator () (T& v) const { return v; }
template <typename T> constexpr hb_remove_reference<T>
operator () (T&& v) const { return v; }
}
HB_FUNCOBJ (hb_lidentity);
struct
{
/* Like identity(), but always returns rvalue. */
template <typename T> constexpr hb_remove_reference<T>
operator () (T&& v) const { return v; }
}
HB_FUNCOBJ (hb_ridentity);
struct
{
template <typename T> constexpr bool
operator () (T&& v) const { return bool (std::forward<T> (v)); }
}
HB_FUNCOBJ (hb_bool);
/* The MIT License
Copyright (C) 2012 Zilong Tan (eric.zltan@gmail.com)
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
// Compression function for Merkle-Damgard construction.
// This function is generated using the framework provided.
#define fasthash_mix(h) ( \
(void) ((h) ^= (h) >> 23), \
(void) ((h) *= 0x2127599bf4325c37ULL), \
(h) ^= (h) >> 47)
static inline uint64_t fasthash64(const void *buf, size_t len, uint64_t seed)
{
struct __attribute__((packed)) packed_uint64_t { uint64_t v; };
const uint64_t m = 0x880355f21e6d1965ULL;
const packed_uint64_t *pos = (const packed_uint64_t *)buf;
const packed_uint64_t *end = pos + (len / 8);
const unsigned char *pos2;
uint64_t h = seed ^ (len * m);
uint64_t v;
#ifndef HB_OPTIMIZE_SIZE
if (((uintptr_t) pos & 7) == 0)
{
while (pos != end)
{
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-align"
v = * (const uint64_t *) (pos++);
#pragma GCC diagnostic pop
h ^= fasthash_mix(v);
h *= m;
}
}
else
#endif
{
while (pos != end)
{
v = pos++->v;
h ^= fasthash_mix(v);
h *= m;
}
}
pos2 = (const unsigned char*)pos;
v = 0;
switch (len & 7) {
case 7: v ^= (uint64_t)pos2[6] << 48; HB_FALLTHROUGH;
case 6: v ^= (uint64_t)pos2[5] << 40; HB_FALLTHROUGH;
case 5: v ^= (uint64_t)pos2[4] << 32; HB_FALLTHROUGH;
case 4: v ^= (uint64_t)pos2[3] << 24; HB_FALLTHROUGH;
case 3: v ^= (uint64_t)pos2[2] << 16; HB_FALLTHROUGH;
case 2: v ^= (uint64_t)pos2[1] << 8; HB_FALLTHROUGH;
case 1: v ^= (uint64_t)pos2[0];
h ^= fasthash_mix(v);
h *= m;
}
return fasthash_mix(h);
}
static inline uint32_t fasthash32(const void *buf, size_t len, uint32_t seed)
{
// the following trick converts the 64-bit hashcode to Fermat
// residue, which shall retain information from both the higher
// and lower parts of hashcode.
uint64_t h = fasthash64(buf, len, seed);
return h - (h >> 32);
}
struct
{
private:
template <typename T> constexpr auto
impl (const T& v, hb_priority<2>) const HB_RETURN (uint32_t, hb_deref (v).hash ())
// Horrible: std:hash() of integers seems to be identity in gcc / clang?!
// https://github.com/harfbuzz/harfbuzz/pull/4228
//
// For performance characteristics see:
// https://github.com/harfbuzz/harfbuzz/pull/4228#issuecomment-1565079537
template <typename T,
hb_enable_if (std::is_integral<T>::value && sizeof (T) <= sizeof (uint32_t))> constexpr auto
impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, (uint32_t) v * 2654435761u /* Knuh's multiplicative hash */)
template <typename T,
hb_enable_if (std::is_integral<T>::value && sizeof (T) > sizeof (uint32_t))> constexpr auto
impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, (uint32_t) (v ^ (v >> 32)) * 2654435761u /* Knuth's multiplicative hash */)
template <typename T,
hb_enable_if (std::is_floating_point<T>::value)> constexpr auto
impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, fasthash32 (std::addressof (v), sizeof (T), 0xf437ffe6))
template <typename T> constexpr auto
impl (const T& v, hb_priority<0>) const HB_RETURN (uint32_t, std::hash<hb_decay<decltype (hb_deref (v))>>{} (hb_deref (v)))
public:
template <typename T> constexpr auto
operator () (const T& v) const HB_RETURN (uint32_t, impl (v, hb_prioritize))
}
HB_FUNCOBJ (hb_hash);
struct
{
private:
/* Pointer-to-member-function. */
template <typename Appl, typename T, typename ...Ts> auto
impl (Appl&& a, hb_priority<2>, T &&v, Ts&&... ds) const HB_AUTO_RETURN
((hb_deref (std::forward<T> (v)).*std::forward<Appl> (a)) (std::forward<Ts> (ds)...))
/* Pointer-to-member. */
template <typename Appl, typename T> auto
impl (Appl&& a, hb_priority<1>, T &&v) const HB_AUTO_RETURN
((hb_deref (std::forward<T> (v))).*std::forward<Appl> (a))
/* Operator(). */
template <typename Appl, typename ...Ts> auto
impl (Appl&& a, hb_priority<0>, Ts&&... ds) const HB_AUTO_RETURN
(hb_deref (std::forward<Appl> (a)) (std::forward<Ts> (ds)...))
public:
template <typename Appl, typename ...Ts> auto
operator () (Appl&& a, Ts&&... ds) const HB_AUTO_RETURN
(
impl (std::forward<Appl> (a),
hb_prioritize,
std::forward<Ts> (ds)...)
)
}
HB_FUNCOBJ (hb_invoke);
template <unsigned Pos, typename Appl, typename V>
struct hb_partial_t
{
hb_partial_t (Appl a, V v) : a (a), v (v) {}
static_assert (Pos > 0, "");
template <typename ...Ts,
unsigned P = Pos,
hb_enable_if (P == 1)> auto
operator () (Ts&& ...ds) -> decltype (hb_invoke (hb_declval (Appl),
hb_declval (V),
hb_declval (Ts)...))
{
return hb_invoke (std::forward<Appl> (a),
std::forward<V> (v),
std::forward<Ts> (ds)...);
}
template <typename T0, typename ...Ts,
unsigned P = Pos,
hb_enable_if (P == 2)> auto
operator () (T0&& d0, Ts&& ...ds) -> decltype (hb_invoke (hb_declval (Appl),
hb_declval (T0),
hb_declval (V),
hb_declval (Ts)...))
{
return hb_invoke (std::forward<Appl> (a),
std::forward<T0> (d0),
std::forward<V> (v),
std::forward<Ts> (ds)...);
}
private:
hb_reference_wrapper<Appl> a;
V v;
};
template <unsigned Pos=1, typename Appl, typename V>
auto hb_partial (Appl&& a, V&& v) HB_AUTO_RETURN
(( hb_partial_t<Pos, Appl, V> (a, v) ))
/* The following, HB_PARTIALIZE, macro uses a particular corner-case
* of C++11 that is not particularly well-supported by all compilers.
* What's happening is that it's using "this" in a trailing return-type
* via decltype(). Broken compilers deduce the type of "this" pointer
* in that context differently from what it resolves to in the body
* of the function.
*
* One probable cause of this is that at the time of trailing return
* type declaration, "this" points to an incomplete type, whereas in
* the function body the type is complete. That doesn't justify the
* error in any way, but is probably what's happening.
*
* In the case of MSVC, we get around this by using C++14 "decltype(auto)"
* which deduces the type from the actual return statement. For gcc 4.8
* we use "+this" instead of "this" which produces an rvalue that seems
* to be deduced as the same type with this particular compiler, and seem
* to be fine as default code path as well.
*/
#ifdef _MSC_VER
/* https://github.com/harfbuzz/harfbuzz/issues/1730 */ \
#define HB_PARTIALIZE(Pos) \
template <typename _T> \
decltype(auto) operator () (_T&& _v) const \
{ return hb_partial<Pos> (this, std::forward<_T> (_v)); } \
static_assert (true, "")
#else
/* https://github.com/harfbuzz/harfbuzz/issues/1724 */
#define HB_PARTIALIZE(Pos) \
template <typename _T> \
auto operator () (_T&& _v) const HB_AUTO_RETURN \
(hb_partial<Pos> (+this, std::forward<_T> (_v))) \
static_assert (true, "")
#endif
struct
{
private:
template <typename Pred, typename Val> auto
impl (Pred&& p, Val &&v, hb_priority<1>) const HB_AUTO_RETURN
(
hb_deref (std::forward<Pred> (p)).has (std::forward<Val> (v))
)
template <typename Pred, typename Val> auto
impl (Pred&& p, Val &&v, hb_priority<0>) const HB_AUTO_RETURN
(
hb_invoke (std::forward<Pred> (p),
std::forward<Val> (v))
)
public:
template <typename Pred, typename Val> auto
operator () (Pred&& p, Val &&v) const HB_RETURN (bool,
impl (std::forward<Pred> (p),
std::forward<Val> (v),
hb_prioritize)
)
}
HB_FUNCOBJ (hb_has);
struct
{
private:
template <typename Pred, typename Val> auto
impl (Pred&& p, Val &&v, hb_priority<1>) const HB_AUTO_RETURN
(
hb_has (std::forward<Pred> (p),
std::forward<Val> (v))
)
template <typename Pred, typename Val> auto
impl (Pred&& p, Val &&v, hb_priority<0>) const HB_AUTO_RETURN
(
std::forward<Pred> (p) == std::forward<Val> (v)
)
public:
template <typename Pred, typename Val> auto
operator () (Pred&& p, Val &&v) const HB_RETURN (bool,
impl (std::forward<Pred> (p),
std::forward<Val> (v),
hb_prioritize)
)
}
HB_FUNCOBJ (hb_match);
struct
{
private:
template <typename Proj, typename Val> auto
impl (Proj&& f, Val &&v, hb_priority<2>) const HB_AUTO_RETURN
(
hb_deref (std::forward<Proj> (f)).get (std::forward<Val> (v))
)
template <typename Proj, typename Val> auto
impl (Proj&& f, Val &&v, hb_priority<1>) const HB_AUTO_RETURN
(
hb_invoke (std::forward<Proj> (f),
std::forward<Val> (v))
)
template <typename Proj, typename Val> auto
impl (Proj&& f, Val &&v, hb_priority<0>) const HB_AUTO_RETURN
(
std::forward<Proj> (f)[std::forward<Val> (v)]
)
public:
template <typename Proj, typename Val> auto
operator () (Proj&& f, Val &&v) const HB_AUTO_RETURN
(
impl (std::forward<Proj> (f),
std::forward<Val> (v),
hb_prioritize)
)
}
HB_FUNCOBJ (hb_get);
struct
{
private:
template <typename T1, typename T2> auto
impl (T1&& v1, T2 &&v2, hb_priority<3>) const HB_AUTO_RETURN
(
std::forward<T2> (v2).cmp (std::forward<T1> (v1)) == 0
)
template <typename T1, typename T2> auto
impl (T1&& v1, T2 &&v2, hb_priority<2>) const HB_AUTO_RETURN
(
std::forward<T1> (v1).cmp (std::forward<T2> (v2)) == 0
)
template <typename T1, typename T2> auto
impl (T1&& v1, T2 &&v2, hb_priority<1>) const HB_AUTO_RETURN
(
std::forward<T1> (v1) == std::forward<T2> (v2)
)
template <typename T1, typename T2> auto
impl (T1&& v1, T2 &&v2, hb_priority<0>) const HB_AUTO_RETURN
(
std::forward<T2> (v2) == std::forward<T1> (v1)
)
public:
template <typename T1, typename T2> auto
operator () (T1&& v1, T2 &&v2) const HB_AUTO_RETURN
(
impl (std::forward<T1> (v1),
std::forward<T2> (v2),
hb_prioritize)
)
}
HB_FUNCOBJ (hb_equal);
struct
{
template <typename T> void
operator () (T& a, T& b) const
{
using std::swap; // allow ADL
swap (a, b);
}
}
HB_FUNCOBJ (hb_swap);
template <typename T1, typename T2>
struct hb_pair_t
{
typedef T1 first_t;
typedef T2 second_t;
typedef hb_pair_t<T1, T2> pair_t;
template <typename U1 = T1, typename U2 = T2,
hb_enable_if (std::is_default_constructible<U1>::value &&
std::is_default_constructible<U2>::value)>
hb_pair_t () : first (), second () {}
hb_pair_t (T1 a, T2 b) : first (std::forward<T1> (a)), second (std::forward<T2> (b)) {}
template <typename Q1, typename Q2,
hb_enable_if (hb_is_convertible (T1, Q1) &&
hb_is_convertible (T2, Q2))>
operator hb_pair_t<Q1, Q2> () { return hb_pair_t<Q1, Q2> (first, second); }
hb_pair_t<T1, T2> reverse () const
{ return hb_pair_t<T1, T2> (second, first); }
bool operator == (const pair_t& o) const { return first == o.first && second == o.second; }
bool operator != (const pair_t& o) const { return !(*this == o); }
bool operator < (const pair_t& o) const { return first < o.first || (first == o.first && second < o.second); }
bool operator >= (const pair_t& o) const { return !(*this < o); }
bool operator > (const pair_t& o) const { return first > o.first || (first == o.first && second > o.second); }
bool operator <= (const pair_t& o) const { return !(*this > o); }
static int cmp (const void *pa, const void *pb)
{
pair_t *a = (pair_t *) pa;
pair_t *b = (pair_t *) pb;
if (a->first < b->first) return -1;
if (a->first > b->first) return +1;
if (a->second < b->second) return -1;
if (a->second > b->second) return +1;
return 0;
}
friend void swap (hb_pair_t& a, hb_pair_t& b) noexcept
{
hb_swap (a.first, b.first);
hb_swap (a.second, b.second);
}
T1 first;
T2 second;
};
template <typename T1, typename T2> static inline hb_pair_t<T1, T2>
hb_pair (T1&& a, T2&& b) { return hb_pair_t<T1, T2> (a, b); }
typedef hb_pair_t<hb_codepoint_t, hb_codepoint_t> hb_codepoint_pair_t;
struct
{
template <typename Pair> constexpr typename Pair::first_t
operator () (const Pair& pair) const { return pair.first; }
}
HB_FUNCOBJ (hb_first);
struct
{
template <typename Pair> constexpr typename Pair::second_t
operator () (const Pair& pair) const { return pair.second; }
}
HB_FUNCOBJ (hb_second);
/* Note. In min/max impl, we can use hb_type_identity<T> for second argument.
* However, that would silently convert between different-signedness integers.
* Instead we accept two different types, such that compiler can err if
* comparing integers of different signedness. */
struct
{
template <typename T, typename T2> constexpr auto
operator () (T&& a, T2&& b) const HB_AUTO_RETURN
(a <= b ? a : b)
}
HB_FUNCOBJ (hb_min);
struct
{
template <typename T, typename T2> constexpr auto
operator () (T&& a, T2&& b) const HB_AUTO_RETURN
(a >= b ? a : b)
}
HB_FUNCOBJ (hb_max);
struct
{
template <typename T, typename T2, typename T3> constexpr auto
operator () (T&& x, T2&& min, T3&& max) const HB_AUTO_RETURN
(hb_min (hb_max (std::forward<T> (x), std::forward<T2> (min)), std::forward<T3> (max)))
}
HB_FUNCOBJ (hb_clamp);
/*
* Bithacks.
*/
/* Return the number of 1 bits in a uint8_t; faster than hb_popcount() */
static inline unsigned
hb_popcount8 (uint8_t v)
{
static const uint8_t popcount4[16] = {
0, 1, 1, 2, 1, 2, 2, 3,
1, 2, 2, 3, 2, 3, 3, 4
};
return popcount4[v & 0xF] + popcount4[v >> 4];
}
/* Return the number of 1 bits in v. */
template <typename T>
static inline unsigned int
hb_popcount (T v)
{
#if hb_has_builtin(__builtin_popcount)
if (sizeof (T) <= sizeof (unsigned int))
return __builtin_popcount (v);
#endif
#if hb_has_builtin(__builtin_popcountl)
if (sizeof (T) <= sizeof (unsigned long))
return __builtin_popcountl (v);
#endif
#if hb_has_builtin(__builtin_popcountll)
if (sizeof (T) <= sizeof (unsigned long long))
return __builtin_popcountll (v);
#endif
if (sizeof (T) <= 4)
{
/* "HACKMEM 169" */
uint32_t y;
y = (v >> 1) &033333333333;
y = v - y - ((y >>1) & 033333333333);
return (((y + (y >> 3)) & 030707070707) % 077);
}
if (sizeof (T) == 8)
{
uint64_t y = (uint64_t) v;
y -= ((y >> 1) & 0x5555555555555555ull);
y = (y & 0x3333333333333333ull) + (y >> 2 & 0x3333333333333333ull);
return ((y + (y >> 4)) & 0xf0f0f0f0f0f0f0full) * 0x101010101010101ull >> 56;
}
if (sizeof (T) == 16)
{
unsigned int shift = 64;
return hb_popcount<uint64_t> ((uint64_t) v) + hb_popcount ((uint64_t) (v >> shift));
}
assert (0);
return 0; /* Shut up stupid compiler. */
}
/* Returns the number of bits needed to store number */
template <typename T>
static inline unsigned int
hb_bit_storage (T v)
{
if (unlikely (!v)) return 0;
#if hb_has_builtin(__builtin_clz)
if (sizeof (T) <= sizeof (unsigned int))
return sizeof (unsigned int) * 8 - __builtin_clz (v);
#endif
#if hb_has_builtin(__builtin_clzl)
if (sizeof (T) <= sizeof (unsigned long))
return sizeof (unsigned long) * 8 - __builtin_clzl (v);
#endif
#if hb_has_builtin(__builtin_clzll)
if (sizeof (T) <= sizeof (unsigned long long))
return sizeof (unsigned long long) * 8 - __builtin_clzll (v);
#endif
#if (defined(_MSC_VER) && _MSC_VER >= 1500) || (defined(__MINGW32__) && (__GNUC__ < 4))
if (sizeof (T) <= sizeof (unsigned int))
{
unsigned long where;
_BitScanReverse (&where, v);
return 1 + where;
}
# if defined(_WIN64)
if (sizeof (T) <= 8)
{
unsigned long where;
_BitScanReverse64 (&where, v);
return 1 + where;
}
# endif
#endif
if (sizeof (T) <= 4)
{
/* "bithacks" */
const unsigned int b[] = {0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000};
const unsigned int S[] = {1, 2, 4, 8, 16};
unsigned int r = 0;
for (int i = 4; i >= 0; i--)
if (v & b[i])
{
v >>= S[i];
r |= S[i];
}
return r + 1;
}
if (sizeof (T) <= 8)
{
/* "bithacks" */
const uint64_t b[] = {0x2ULL, 0xCULL, 0xF0ULL, 0xFF00ULL, 0xFFFF0000ULL, 0xFFFFFFFF00000000ULL};
const unsigned int S[] = {1, 2, 4, 8, 16, 32};
unsigned int r = 0;
for (int i = 5; i >= 0; i--)
if (v & b[i])
{
v >>= S[i];
r |= S[i];
}
return r + 1;
}
if (sizeof (T) == 16)
{
unsigned int shift = 64;
return (v >> shift) ? hb_bit_storage<uint64_t> ((uint64_t) (v >> shift)) + shift :
hb_bit_storage<uint64_t> ((uint64_t) v);
}
assert (0);
return 0; /* Shut up stupid compiler. */
}
/* Returns the number of zero bits in the least significant side of v */
template <typename T>
static inline unsigned int
hb_ctz (T v)
{
if (unlikely (!v)) return 8 * sizeof (T);
#if hb_has_builtin(__builtin_ctz)
if (sizeof (T) <= sizeof (unsigned int))
return __builtin_ctz (v);
#endif
#if hb_has_builtin(__builtin_ctzl)
if (sizeof (T) <= sizeof (unsigned long))
return __builtin_ctzl (v);
#endif
#if hb_has_builtin(__builtin_ctzll)
if (sizeof (T) <= sizeof (unsigned long long))
return __builtin_ctzll (v);
#endif
#if (defined(_MSC_VER) && _MSC_VER >= 1500) || (defined(__MINGW32__) && (__GNUC__ < 4))
if (sizeof (T) <= sizeof (unsigned int))
{
unsigned long where;
_BitScanForward (&where, v);
return where;
}
# if defined(_WIN64)
if (sizeof (T) <= 8)
{
unsigned long where;
_BitScanForward64 (&where, v);
return where;
}
# endif
#endif
if (sizeof (T) <= 4)
{
/* "bithacks" */
unsigned int c = 32;
v &= - (int32_t) v;
if (v) c--;
if (v & 0x0000FFFF) c -= 16;
if (v & 0x00FF00FF) c -= 8;
if (v & 0x0F0F0F0F) c -= 4;
if (v & 0x33333333) c -= 2;
if (v & 0x55555555) c -= 1;
return c;
}
if (sizeof (T) <= 8)
{
/* "bithacks" */
unsigned int c = 64;
v &= - (int64_t) (v);
if (v) c--;
if (v & 0x00000000FFFFFFFFULL) c -= 32;
if (v & 0x0000FFFF0000FFFFULL) c -= 16;
if (v & 0x00FF00FF00FF00FFULL) c -= 8;
if (v & 0x0F0F0F0F0F0F0F0FULL) c -= 4;
if (v & 0x3333333333333333ULL) c -= 2;
if (v & 0x5555555555555555ULL) c -= 1;
return c;
}
if (sizeof (T) == 16)
{
unsigned int shift = 64;
return (uint64_t) v ? hb_bit_storage<uint64_t> ((uint64_t) v) :
hb_bit_storage<uint64_t> ((uint64_t) (v >> shift)) + shift;
}
assert (0);
return 0; /* Shut up stupid compiler. */
}
/*
* Tiny stuff.
*/
/* ASCII tag/character handling */
static inline bool ISALPHA (unsigned char c)
{ return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); }
static inline bool ISALNUM (unsigned char c)
{ return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'); }
static inline bool ISSPACE (unsigned char c)
{ return c == ' ' || c =='\f'|| c =='\n'|| c =='\r'|| c =='\t'|| c =='\v'; }
static inline unsigned char TOUPPER (unsigned char c)
{ return (c >= 'a' && c <= 'z') ? c - 'a' + 'A' : c; }
static inline unsigned char TOLOWER (unsigned char c)
{ return (c >= 'A' && c <= 'Z') ? c - 'A' + 'a' : c; }
static inline bool ISHEX (unsigned char c)
{ return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'); }
static inline unsigned char TOHEX (uint8_t c)
{ return (c & 0xF) <= 9 ? (c & 0xF) + '0' : (c & 0xF) + 'a' - 10; }
static inline uint8_t FROMHEX (unsigned char c)
{ return (c >= '0' && c <= '9') ? c - '0' : TOLOWER (c) - 'a' + 10; }
static inline unsigned int DIV_CEIL (const unsigned int a, unsigned int b)
{ return (a + (b - 1)) / b; }
#undef ARRAY_LENGTH
template <typename Type, unsigned int n>
static inline unsigned int ARRAY_LENGTH (const Type (&)[n]) { return n; }
/* A const version, but does not detect erratically being called on pointers. */
#define ARRAY_LENGTH_CONST(__array) ((signed int) (sizeof (__array) / sizeof (__array[0])))
static inline void *
hb_memcpy (void *__restrict dst, const void *__restrict src, size_t len)
{
/* It's illegal to pass 0 as size to memcpy. */
if (unlikely (!len)) return dst;
return memcpy (dst, src, len);
}
static inline int
hb_memcmp (const void *a, const void *b, unsigned int len)
{
/* It's illegal to pass NULL to memcmp(), even if len is zero.
* So, wrap it.
* https://sourceware.org/bugzilla/show_bug.cgi?id=23878 */
if (unlikely (!len)) return 0;
return memcmp (a, b, len);
}
static inline void *
hb_memset (void *s, int c, unsigned int n)
{
/* It's illegal to pass NULL to memset(), even if n is zero. */
if (unlikely (!n)) return s;
return memset (s, c, n);
}
static inline unsigned int
hb_ceil_to_4 (unsigned int v)
{
return ((v - 1) | 3) + 1;
}
template <typename T> static inline bool
hb_in_range (T u, T lo, T hi)
{
static_assert (!std::is_signed<T>::value, "");
/* The casts below are important as if T is smaller than int,
* the subtract results will become a signed int! */
return (T)(u - lo) <= (T)(hi - lo);
}
template <typename T> static inline bool
hb_in_ranges (T u, T lo1, T hi1)
{
return hb_in_range (u, lo1, hi1);
}
template <typename T, typename ...Ts> static inline bool
hb_in_ranges (T u, T lo1, T hi1, Ts... ds)
{
return hb_in_range<T> (u, lo1, hi1) || hb_in_ranges<T> (u, ds...);
}
/*
* Overflow checking.
*/
static inline bool
hb_unsigned_mul_overflows (unsigned int count, unsigned int size, unsigned *result = nullptr)
{
#if hb_has_builtin(__builtin_mul_overflow)
unsigned stack_result;
if (!result)
result = &stack_result;
return __builtin_mul_overflow (count, size, result);
#endif
if (result)
*result = count * size;
return (size > 0) && (count >= ((unsigned int) -1) / size);
}
/*
* Sort and search.
*/
template <typename K, typename V, typename ...Ts>
static int
_hb_cmp_method (const void *pkey, const void *pval, Ts... ds)
{
const K& key = * (const K*) pkey;
const V& val = * (const V*) pval;
return val.cmp (key, ds...);
}
template <typename K, typename V>
static int
_hb_cmp_operator (const void *pkey, const void *pval)
{
const K& key = * (const K*) pkey;
const V& val = * (const V*) pval;
if (key < val) return -1;
if (key > val) return 1;
return 0;
}
template <typename V, typename K, typename ...Ts>
HB_HOT
static inline bool
hb_bsearch_impl (unsigned *pos, /* Out */
const K& key,
V* base, size_t nmemb, size_t stride,
int (*compar)(const void *_key, const void *_item, Ts... _ds),
Ts... ds)
{
/* This is our *only* bsearch implementation. */
int min = 0, max = (int) nmemb - 1;
while (min <= max)
{
int mid = ((unsigned int) min + (unsigned int) max) / 2;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-align"
V* p = (V*) (((const char *) base) + (mid * stride));
#pragma GCC diagnostic pop
int c = compar ((const void *) std::addressof (key), (const void *) p, ds...);
if (c < 0)
max = mid - 1;
else if (c > 0)
min = mid + 1;
else
{
*pos = mid;
return true;
}
}
*pos = min;
return false;
}
template <typename V, typename K>
static inline V*
hb_bsearch (const K& key, V* base,
size_t nmemb, size_t stride = sizeof (V),
int (*compar)(const void *_key, const void *_item) = _hb_cmp_method<K, V>)
{
unsigned pos;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-align"
return hb_bsearch_impl (&pos, key, base, nmemb, stride, compar) ?
(V*) (((const char *) base) + (pos * stride)) : nullptr;
#pragma GCC diagnostic pop
}
template <typename V, typename K, typename ...Ts>
static inline V*
hb_bsearch (const K& key, V* base,
size_t nmemb, size_t stride,
int (*compar)(const void *_key, const void *_item, Ts... _ds),
Ts... ds)
{
unsigned pos;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-align"
return hb_bsearch_impl (&pos, key, base, nmemb, stride, compar, ds...) ?
(V*) (((const char *) base) + (pos * stride)) : nullptr;
#pragma GCC diagnostic pop
}
/* From https://github.com/noporpoise/sort_r
Feb 5, 2019 (c8c65c1e)
Modified to support optional argument using templates */
/* Isaac Turner 29 April 2014 Public Domain */
/*
hb_qsort function to be exported.
Parameters:
base is the array to be sorted
nel is the number of elements in the array
width is the size in bytes of each element of the array
compar is the comparison function
arg (optional) is a pointer to be passed to the comparison function
void hb_qsort(void *base, size_t nel, size_t width,
int (*compar)(const void *_a, const void *_b, [void *_arg]),
[void *arg]);
*/
#define SORT_R_SWAP(a,b,tmp) ((void) ((tmp) = (a)), (void) ((a) = (b)), (b) = (tmp))
/* swap a and b */
/* a and b must not be equal! */
static inline void sort_r_swap(char *__restrict a, char *__restrict b,
size_t w)
{
char tmp, *end = a+w;
for(; a < end; a++, b++) { SORT_R_SWAP(*a, *b, tmp); }
}
/* swap a, b iff a>b */
/* a and b must not be equal! */
/* __restrict is same as restrict but better support on old machines */
template <typename ...Ts>
static inline int sort_r_cmpswap(char *__restrict a,
char *__restrict b, size_t w,
int (*compar)(const void *_a,
const void *_b,
Ts... _ds),
Ts... ds)
{
if(compar(a, b, ds...) > 0) {
sort_r_swap(a, b, w);
return 1;
}
return 0;
}
/*
Swap consecutive blocks of bytes of size na and nb starting at memory addr ptr,
with the smallest swap so that the blocks are in the opposite order. Blocks may
be internally re-ordered e.g.
12345ab -> ab34512
123abc -> abc123
12abcde -> deabc12
*/
static inline void sort_r_swap_blocks(char *ptr, size_t na, size_t nb)
{
if(na > 0 && nb > 0) {
if(na > nb) { sort_r_swap(ptr, ptr+na, nb); }
else { sort_r_swap(ptr, ptr+nb, na); }
}
}
/* Implement recursive quicksort ourselves */
/* Note: quicksort is not stable, equivalent values may be swapped */
template <typename ...Ts>
static inline void sort_r_simple(void *base, size_t nel, size_t w,
int (*compar)(const void *_a,
const void *_b,
Ts... _ds),
Ts... ds)
{
char *b = (char *)base, *end = b + nel*w;
/* for(size_t i=0; i<nel; i++) {printf("%4i", *(int*)(b + i*sizeof(int)));}
printf("\n"); */
if(nel < 10) {
/* Insertion sort for arbitrarily small inputs */
char *pi, *pj;
for(pi = b+w; pi < end; pi += w) {
for(pj = pi; pj > b && sort_r_cmpswap(pj-w,pj,w,compar,ds...); pj -= w) {}
}
}
else
{
/* nel > 9; Quicksort */
int cmp;
char *pl, *ple, *pr, *pre, *pivot;
char *last = b+w*(nel-1), *tmp;
/*
Use median of second, middle and second-last items as pivot.
First and last may have been swapped with pivot and therefore be extreme
*/
char *l[3];
l[0] = b + w;
l[1] = b+w*(nel/2);
l[2] = last - w;
/* printf("pivots: %i, %i, %i\n", *(int*)l[0], *(int*)l[1], *(int*)l[2]); */
if(compar(l[0],l[1],ds...) > 0) { SORT_R_SWAP(l[0], l[1], tmp); }
if(compar(l[1],l[2],ds...) > 0) {
SORT_R_SWAP(l[1], l[2], tmp);
if(compar(l[0],l[1],ds...) > 0) { SORT_R_SWAP(l[0], l[1], tmp); }
}
/* swap mid value (l[1]), and last element to put pivot as last element */
if(l[1] != last) { sort_r_swap(l[1], last, w); }
/*
pl is the next item on the left to be compared to the pivot
pr is the last item on the right that was compared to the pivot
ple is the left position to put the next item that equals the pivot
ple is the last right position where we put an item that equals the pivot
v- end (beyond the array)
EEEEEELLLLLLLLuuuuuuuuGGGGGGGEEEEEEEE.
^- b ^- ple ^- pl ^- pr ^- pre ^- last (where the pivot is)
Pivot comparison key:
E = equal, L = less than, u = unknown, G = greater than, E = equal
*/
pivot = last;
ple = pl = b;
pre = pr = last;
/*
Strategy:
Loop into the list from the left and right at the same time to find:
- an item on the left that is greater than the pivot
- an item on the right that is less than the pivot
Once found, they are swapped and the loop continues.
Meanwhile items that are equal to the pivot are moved to the edges of the
array.
*/
while(pl < pr) {
/* Move left hand items which are equal to the pivot to the far left.
break when we find an item that is greater than the pivot */
for(; pl < pr; pl += w) {
cmp = compar(pl, pivot, ds...);
if(cmp > 0) { break; }
else if(cmp == 0) {
if(ple < pl) { sort_r_swap(ple, pl, w); }
ple += w;
}
}
/* break if last batch of left hand items were equal to pivot */
if(pl >= pr) { break; }
/* Move right hand items which are equal to the pivot to the far right.
break when we find an item that is less than the pivot */
for(; pl < pr; ) {
pr -= w; /* Move right pointer onto an unprocessed item */
cmp = compar(pr, pivot, ds...);
if(cmp == 0) {
pre -= w;
if(pr < pre) { sort_r_swap(pr, pre, w); }
}
else if(cmp < 0) {
if(pl < pr) { sort_r_swap(pl, pr, w); }
pl += w;
break;
}
}
}
pl = pr; /* pr may have gone below pl */
/*
Now we need to go from: EEELLLGGGGEEEE
to: LLLEEEEEEEGGGG
Pivot comparison key:
E = equal, L = less than, u = unknown, G = greater than, E = equal
*/
sort_r_swap_blocks(b, ple-b, pl-ple);
sort_r_swap_blocks(pr, pre-pr, end-pre);
/*for(size_t i=0; i<nel; i++) {printf("%4i", *(int*)(b + i*sizeof(int)));}
printf("\n");*/
sort_r_simple(b, (pl-ple)/w, w, compar, ds...);
sort_r_simple(end-(pre-pr), (pre-pr)/w, w, compar, ds...);
}
}
static inline void
hb_qsort (void *base, size_t nel, size_t width,
int (*compar)(const void *_a, const void *_b))
{
#if defined(__OPTIMIZE_SIZE__) && !defined(HB_USE_INTERNAL_QSORT)
qsort (base, nel, width, compar);
#else
sort_r_simple (base, nel, width, compar);
#endif
}
static inline void
hb_qsort (void *base, size_t nel, size_t width,
int (*compar)(const void *_a, const void *_b, void *_arg),
void *arg)
{
#ifdef HAVE_GNU_QSORT_R
qsort_r (base, nel, width, compar, arg);
#else
sort_r_simple (base, nel, width, compar, arg);
#endif
}
template <typename T, typename T2, typename T3 = int> static inline void
hb_stable_sort (T *array, unsigned int len, int(*compar)(const T2 *, const T2 *), T3 *array2 = nullptr)
{
static_assert (hb_is_trivially_copy_assignable (T), "");
static_assert (hb_is_trivially_copy_assignable (T3), "");
for (unsigned int i = 1; i < len; i++)
{
unsigned int j = i;
while (j && compar (&array[j - 1], &array[i]) > 0)
j--;
if (i == j)
continue;
/* Move item i to occupy place for item j, shift what's in between. */
{
T t = array[i];
memmove (&array[j + 1], &array[j], (i - j) * sizeof (T));
array[j] = t;
}
if (array2)
{
T3 t = array2[i];
memmove (&array2[j + 1], &array2[j], (i - j) * sizeof (T3));
array2[j] = t;
}
}
}
static inline hb_bool_t
hb_codepoint_parse (const char *s, unsigned int len, int base, hb_codepoint_t *out)
{
unsigned int v;
const char *p = s;
const char *end = p + len;
if (unlikely (!hb_parse_uint (&p, end, &v, true/* whole buffer */, base)))
return false;
*out = v;
return true;
}
/* Operators. */
struct
{ HB_PARTIALIZE(2);
template <typename T> constexpr auto
operator () (const T &a, const T &b) const HB_AUTO_RETURN (a & b)
}
HB_FUNCOBJ (hb_bitwise_and);
struct
{ HB_PARTIALIZE(2);
template <typename T> constexpr auto
operator () (const T &a, const T &b) const HB_AUTO_RETURN (a | b)
}
HB_FUNCOBJ (hb_bitwise_or);
struct
{ HB_PARTIALIZE(2);
template <typename T> constexpr auto
operator () (const T &a, const T &b) const HB_AUTO_RETURN (a ^ b)
}
HB_FUNCOBJ (hb_bitwise_xor);
struct
{ HB_PARTIALIZE(2);
template <typename T> constexpr auto
operator () (const T &a, const T &b) const HB_AUTO_RETURN (~a & b)
}
HB_FUNCOBJ (hb_bitwise_lt);
struct
{ HB_PARTIALIZE(2);
template <typename T> constexpr auto
operator () (const T &a, const T &b) const HB_AUTO_RETURN (a & ~b)
}
HB_FUNCOBJ (hb_bitwise_gt); // aka sub
struct
{ HB_PARTIALIZE(2);
template <typename T> constexpr auto
operator () (const T &a, const T &b) const HB_AUTO_RETURN (~a | b)
}
HB_FUNCOBJ (hb_bitwise_le);
struct
{ HB_PARTIALIZE(2);
template <typename T> constexpr auto
operator () (const T &a, const T &b) const HB_AUTO_RETURN (a | ~b)
}
HB_FUNCOBJ (hb_bitwise_ge);
struct
{
template <typename T> constexpr auto
operator () (const T &a) const HB_AUTO_RETURN (~a)
}
HB_FUNCOBJ (hb_bitwise_neg);
struct
{ HB_PARTIALIZE(2);
template <typename T, typename T2> constexpr auto
operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a + b)
}
HB_FUNCOBJ (hb_add);
struct
{ HB_PARTIALIZE(2);
template <typename T, typename T2> constexpr auto
operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a - b)
}
HB_FUNCOBJ (hb_sub);
struct
{ HB_PARTIALIZE(2);
template <typename T, typename T2> constexpr auto
operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (b - a)
}
HB_FUNCOBJ (hb_rsub);
struct
{ HB_PARTIALIZE(2);
template <typename T, typename T2> constexpr auto
operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a * b)
}
HB_FUNCOBJ (hb_mul);
struct
{ HB_PARTIALIZE(2);
template <typename T, typename T2> constexpr auto
operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a / b)
}
HB_FUNCOBJ (hb_div);
struct
{ HB_PARTIALIZE(2);
template <typename T, typename T2> constexpr auto
operator () (const T &a, const T2 &b) const HB_AUTO_RETURN (a % b)
}
HB_FUNCOBJ (hb_mod);
struct
{
template <typename T> constexpr auto
operator () (const T &a) const HB_AUTO_RETURN (+a)
}
HB_FUNCOBJ (hb_pos);
struct
{
template <typename T> constexpr auto
operator () (const T &a) const HB_AUTO_RETURN (-a)
}
HB_FUNCOBJ (hb_neg);
struct
{
template <typename T> constexpr auto
operator () (T &a) const HB_AUTO_RETURN (++a)
}
HB_FUNCOBJ (hb_inc);
struct
{
template <typename T> constexpr auto
operator () (T &a) const HB_AUTO_RETURN (--a)
}
HB_FUNCOBJ (hb_dec);
/* Adapted from kurbo implementation with extra parameters added,
* and finding for a particular range instead of 0.
*
* For documentation and implementation see:
*
* [ITP method]: https://en.wikipedia.org/wiki/ITP_Method
* [An Enhancement of the Bisection Method Average Performance Preserving Minmax Optimality]: https://dl.acm.org/doi/10.1145/3423597
* https://docs.rs/kurbo/0.8.1/kurbo/common/fn.solve_itp.html
* https://github.com/linebender/kurbo/blob/fd839c25ea0c98576c7ce5789305822675a89938/src/common.rs#L162-L248
*/
template <typename func_t>
double solve_itp (func_t f,
double a, double b,
double epsilon,
double min_y, double max_y,
double &ya, double &yb, double &y)
{
unsigned n1_2 = (unsigned) (hb_max (ceil (log2 ((b - a) / epsilon)) - 1.0, 0.0));
const unsigned n0 = 1; // Hardwired
const double k1 = 0.2 / (b - a); // Hardwired.
unsigned nmax = n0 + n1_2;
double scaled_epsilon = epsilon * double (1llu << nmax);
double _2_epsilon = 2.0 * epsilon;
while (b - a > _2_epsilon)
{
double x1_2 = 0.5 * (a + b);
double r = scaled_epsilon - 0.5 * (b - a);
double xf = (yb * a - ya * b) / (yb - ya);
double sigma = x1_2 - xf;
double b_a = b - a;
// This has k2 = 2 hardwired for efficiency.
double b_a_k2 = b_a * b_a;
double delta = k1 * b_a_k2;
int sigma_sign = sigma >= 0 ? +1 : -1;
double xt = delta <= fabs (x1_2 - xf) ? xf + delta * sigma_sign : x1_2;
double xitp = fabs (xt - x1_2) <= r ? xt : x1_2 - r * sigma_sign;
double yitp = f (xitp);
if (yitp > max_y)
{
b = xitp;
yb = yitp;
}
else if (yitp < min_y)
{
a = xitp;
ya = yitp;
}
else
{
y = yitp;
return xitp;
}
scaled_epsilon *= 0.5;
}
return 0.5 * (a + b);
}
#endif /* HB_ALGS_HH */