DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (d8847129d134)

VCS Links

Line Code
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 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376
/*
 * Copyright 2006 The Android Open Source Project
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkDraw.h"
#include "SkBlitter.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkDevice.h"
#include "SkDeviceLooper.h"
#include "SkFixed.h"
#include "SkMaskFilter.h"
#include "SkPaint.h"
#include "SkPathEffect.h"
#include "SkRasterClip.h"
#include "SkRasterizer.h"
#include "SkRRect.h"
#include "SkScan.h"
#include "SkShader.h"
#include "SkSmallAllocator.h"
#include "SkString.h"
#include "SkStroke.h"
#include "SkTextMapStateProc.h"
#include "SkTLazy.h"
#include "SkUtils.h"
#include "SkVertState.h"

#include "SkAutoKern.h"
#include "SkBitmapProcShader.h"
#include "SkDrawProcs.h"
#include "SkMatrixUtils.h"


//#define TRACE_BITMAP_DRAWS


/** Helper for allocating small blitters on the stack.
 */
class SkAutoBlitterChoose : SkNoncopyable {
public:
    SkAutoBlitterChoose() {
        fBlitter = NULL;
    }
    SkAutoBlitterChoose(const SkBitmap& device, const SkMatrix& matrix,
                        const SkPaint& paint, bool drawCoverage = false) {
        fBlitter = SkBlitter::Choose(device, matrix, paint, &fAllocator,
                                     drawCoverage);
    }

    SkBlitter*  operator->() { return fBlitter; }
    SkBlitter*  get() const { return fBlitter; }

    void choose(const SkBitmap& device, const SkMatrix& matrix,
                const SkPaint& paint) {
        SkASSERT(!fBlitter);
        fBlitter = SkBlitter::Choose(device, matrix, paint, &fAllocator);
    }

private:
    // Owned by fAllocator, which will handle the delete.
    SkBlitter*          fBlitter;
    SkTBlitterAllocator fAllocator;
};
#define SkAutoBlitterChoose(...) SK_REQUIRE_LOCAL_VAR(SkAutoBlitterChoose)

/**
 *  Since we are providing the storage for the shader (to avoid the perf cost
 *  of calling new) we insist that in our destructor we can account for all
 *  owners of the shader.
 */
class SkAutoBitmapShaderInstall : SkNoncopyable {
public:
    SkAutoBitmapShaderInstall(const SkBitmap& src, const SkPaint& paint,
                              const SkMatrix* localMatrix = NULL)
            : fPaint(paint) /* makes a copy of the paint */ {
        fPaint.setShader(CreateBitmapShader(src, SkShader::kClamp_TileMode,
                                            SkShader::kClamp_TileMode,
                                            localMatrix, &fAllocator));
        // we deliberately left the shader with an owner-count of 2
        SkASSERT(2 == fPaint.getShader()->getRefCnt());
    }

    ~SkAutoBitmapShaderInstall() {
        // since fAllocator will destroy shader, we insist that owners == 2
        SkASSERT(2 == fPaint.getShader()->getRefCnt());

        fPaint.setShader(NULL); // unref the shader by 1

    }

    // return the new paint that has the shader applied
    const SkPaint& paintWithShader() const { return fPaint; }

private:
    // copy of caller's paint (which we then modify)
    SkPaint             fPaint;
    // Stores the shader.
    SkTBlitterAllocator fAllocator;
};
#define SkAutoBitmapShaderInstall(...) SK_REQUIRE_LOCAL_VAR(SkAutoBitmapShaderInstall)

///////////////////////////////////////////////////////////////////////////////

SkDraw::SkDraw() {
    sk_bzero(this, sizeof(*this));
}

SkDraw::SkDraw(const SkDraw& src) {
    memcpy(this, &src, sizeof(*this));
}

bool SkDraw::computeConservativeLocalClipBounds(SkRect* localBounds) const {
    if (fRC->isEmpty()) {
        return false;
    }

    SkMatrix inverse;
    if (!fMatrix->invert(&inverse)) {
        return false;
    }

    SkIRect devBounds = fRC->getBounds();
    // outset to have slop for antialasing and hairlines
    devBounds.outset(1, 1);
    inverse.mapRect(localBounds, SkRect::Make(devBounds));
    return true;
}

///////////////////////////////////////////////////////////////////////////////

typedef void (*BitmapXferProc)(void* pixels, size_t bytes, uint32_t data);

static void D_Clear_BitmapXferProc(void* pixels, size_t bytes, uint32_t) {
    sk_bzero(pixels, bytes);
}

static void D_Dst_BitmapXferProc(void*, size_t, uint32_t data) {}

static void D32_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
    sk_memset32((uint32_t*)pixels, data, SkToInt(bytes >> 2));
}

static void D16_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
    sk_memset16((uint16_t*)pixels, data, SkToInt(bytes >> 1));
}

static void DA8_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
    memset(pixels, data, bytes);
}

static BitmapXferProc ChooseBitmapXferProc(const SkBitmap& bitmap,
                                           const SkPaint& paint,
                                           uint32_t* data) {
    // todo: we can apply colorfilter up front if no shader, so we wouldn't
    // need to abort this fastpath
    if (paint.getShader() || paint.getColorFilter()) {
        return NULL;
    }

    SkXfermode::Mode mode;
    if (!SkXfermode::AsMode(paint.getXfermode(), &mode)) {
        return NULL;
    }

    SkColor color = paint.getColor();

    // collaps modes based on color...
    if (SkXfermode::kSrcOver_Mode == mode) {
        unsigned alpha = SkColorGetA(color);
        if (0 == alpha) {
            mode = SkXfermode::kDst_Mode;
        } else if (0xFF == alpha) {
            mode = SkXfermode::kSrc_Mode;
        }
    }

    switch (mode) {
        case SkXfermode::kClear_Mode:
//            SkDebugf("--- D_Clear_BitmapXferProc\n");
            return D_Clear_BitmapXferProc;  // ignore data
        case SkXfermode::kDst_Mode:
//            SkDebugf("--- D_Dst_BitmapXferProc\n");
            return D_Dst_BitmapXferProc;    // ignore data
        case SkXfermode::kSrc_Mode: {
            /*
                should I worry about dithering for the lower depths?
            */
            SkPMColor pmc = SkPreMultiplyColor(color);
            switch (bitmap.colorType()) {
                case kN32_SkColorType:
                    if (data) {
                        *data = pmc;
                    }
//                    SkDebugf("--- D32_Src_BitmapXferProc\n");
                    return D32_Src_BitmapXferProc;
                case kRGB_565_SkColorType:
                    if (data) {
                        *data = SkPixel32ToPixel16(pmc);
                    }
//                    SkDebugf("--- D16_Src_BitmapXferProc\n");
                    return D16_Src_BitmapXferProc;
                case kAlpha_8_SkColorType:
                    if (data) {
                        *data = SkGetPackedA32(pmc);
                    }
//                    SkDebugf("--- DA8_Src_BitmapXferProc\n");
                    return DA8_Src_BitmapXferProc;
                default:
                    break;
            }
            break;
        }
        default:
            break;
    }
    return NULL;
}

static void CallBitmapXferProc(const SkBitmap& bitmap, const SkIRect& rect,
                               BitmapXferProc proc, uint32_t procData) {
    int shiftPerPixel;
    switch (bitmap.colorType()) {
        case kN32_SkColorType:
            shiftPerPixel = 2;
            break;
        case kRGB_565_SkColorType:
            shiftPerPixel = 1;
            break;
        case kAlpha_8_SkColorType:
            shiftPerPixel = 0;
            break;
        default:
            SkDEBUGFAIL("Can't use xferproc on this config");
            return;
    }

    uint8_t* pixels = (uint8_t*)bitmap.getPixels();
    SkASSERT(pixels);
    const size_t rowBytes = bitmap.rowBytes();
    const int widthBytes = rect.width() << shiftPerPixel;

    // skip down to the first scanline and X position
    pixels += rect.fTop * rowBytes + (rect.fLeft << shiftPerPixel);
    for (int scans = rect.height() - 1; scans >= 0; --scans) {
        proc(pixels, widthBytes, procData);
        pixels += rowBytes;
    }
}

void SkDraw::drawPaint(const SkPaint& paint) const {
    SkDEBUGCODE(this->validate();)

    if (fRC->isEmpty()) {
        return;
    }

    SkIRect    devRect;
    devRect.set(0, 0, fBitmap->width(), fBitmap->height());

    if (fRC->isBW()) {
        /*  If we don't have a shader (i.e. we're just a solid color) we may
            be faster to operate directly on the device bitmap, rather than invoking
            a blitter. Esp. true for xfermodes, which require a colorshader to be
            present, which is just redundant work. Since we're drawing everywhere
            in the clip, we don't have to worry about antialiasing.
        */
        uint32_t procData = 0;  // to avoid the warning
        BitmapXferProc proc = ChooseBitmapXferProc(*fBitmap, paint, &procData);
        if (proc) {
            if (D_Dst_BitmapXferProc == proc) { // nothing to do
                return;
            }

            SkRegion::Iterator iter(fRC->bwRgn());
            while (!iter.done()) {
                CallBitmapXferProc(*fBitmap, iter.rect(), proc, procData);
                iter.next();
            }
            return;
        }
    }

    // normal case: use a blitter
    SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint);
    SkScan::FillIRect(devRect, *fRC, blitter.get());
}

///////////////////////////////////////////////////////////////////////////////

struct PtProcRec {
    SkCanvas::PointMode fMode;
    const SkPaint*  fPaint;
    const SkRegion* fClip;
    const SkRasterClip* fRC;

    // computed values
    SkFixed fRadius;

    typedef void (*Proc)(const PtProcRec&, const SkPoint devPts[], int count,
                         SkBlitter*);

    bool init(SkCanvas::PointMode, const SkPaint&, const SkMatrix* matrix,
              const SkRasterClip*);
    Proc chooseProc(SkBlitter** blitter);

private:
    SkAAClipBlitterWrapper fWrapper;
};

static void bw_pt_rect_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
                                 int count, SkBlitter* blitter) {
    SkASSERT(rec.fClip->isRect());
    const SkIRect& r = rec.fClip->getBounds();

    for (int i = 0; i < count; i++) {
        int x = SkScalarFloorToInt(devPts[i].fX);
        int y = SkScalarFloorToInt(devPts[i].fY);
        if (r.contains(x, y)) {
            blitter->blitH(x, y, 1);
        }
    }
}

static void bw_pt_rect_16_hair_proc(const PtProcRec& rec,
                                    const SkPoint devPts[], int count,
                                    SkBlitter* blitter) {
    SkASSERT(rec.fRC->isRect());
    const SkIRect& r = rec.fRC->getBounds();
    uint32_t value;
    const SkBitmap* bitmap = blitter->justAnOpaqueColor(&value);
    SkASSERT(bitmap);

    uint16_t* addr = bitmap->getAddr16(0, 0);
    size_t    rb = bitmap->rowBytes();

    for (int i = 0; i < count; i++) {
        int x = SkScalarFloorToInt(devPts[i].fX);
        int y = SkScalarFloorToInt(devPts[i].fY);
        if (r.contains(x, y)) {
            ((uint16_t*)((char*)addr + y * rb))[x] = SkToU16(value);
        }
    }
}

static void bw_pt_rect_32_hair_proc(const PtProcRec& rec,
                                    const SkPoint devPts[], int count,
                                    SkBlitter* blitter) {
    SkASSERT(rec.fRC->isRect());
    const SkIRect& r = rec.fRC->getBounds();
    uint32_t value;
    const SkBitmap* bitmap = blitter->justAnOpaqueColor(&value);
    SkASSERT(bitmap);

    SkPMColor* addr = bitmap->getAddr32(0, 0);
    size_t     rb = bitmap->rowBytes();

    for (int i = 0; i < count; i++) {
        int x = SkScalarFloorToInt(devPts[i].fX);
        int y = SkScalarFloorToInt(devPts[i].fY);
        if (r.contains(x, y)) {
            ((SkPMColor*)((char*)addr + y * rb))[x] = value;
        }
    }
}

static void bw_pt_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
                            int count, SkBlitter* blitter) {
    for (int i = 0; i < count; i++) {
        int x = SkScalarFloorToInt(devPts[i].fX);
        int y = SkScalarFloorToInt(devPts[i].fY);
        if (rec.fClip->contains(x, y)) {
            blitter->blitH(x, y, 1);
        }
    }
}

static void bw_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
                              int count, SkBlitter* blitter) {
    for (int i = 0; i < count; i += 2) {
        SkScan::HairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
    }
}

static void bw_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
                              int count, SkBlitter* blitter) {
    for (int i = 0; i < count - 1; i++) {
        SkScan::HairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
    }
}

// aa versions

static void aa_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
                              int count, SkBlitter* blitter) {
    for (int i = 0; i < count; i += 2) {
        SkScan::AntiHairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
    }
}

static void aa_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
                              int count, SkBlitter* blitter) {
    for (int i = 0; i < count - 1; i++) {
        SkScan::AntiHairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
    }
}

// square procs (strokeWidth > 0 but matrix is square-scale (sx == sy)

static void bw_square_proc(const PtProcRec& rec, const SkPoint devPts[],
                           int count, SkBlitter* blitter) {
    const SkFixed radius = rec.fRadius;
    for (int i = 0; i < count; i++) {
        SkFixed x = SkScalarToFixed(devPts[i].fX);
        SkFixed y = SkScalarToFixed(devPts[i].fY);

        SkXRect r;
        r.fLeft = x - radius;
        r.fTop = y - radius;
        r.fRight = x + radius;
        r.fBottom = y + radius;

        SkScan::FillXRect(r, *rec.fRC, blitter);
    }
}

static void aa_square_proc(const PtProcRec& rec, const SkPoint devPts[],
                           int count, SkBlitter* blitter) {
    const SkFixed radius = rec.fRadius;
    for (int i = 0; i < count; i++) {
        SkFixed x = SkScalarToFixed(devPts[i].fX);
        SkFixed y = SkScalarToFixed(devPts[i].fY);

        SkXRect r;
        r.fLeft = x - radius;
        r.fTop = y - radius;
        r.fRight = x + radius;
        r.fBottom = y + radius;

        SkScan::AntiFillXRect(r, *rec.fRC, blitter);
    }
}

// If this guy returns true, then chooseProc() must return a valid proc
bool PtProcRec::init(SkCanvas::PointMode mode, const SkPaint& paint,
                     const SkMatrix* matrix, const SkRasterClip* rc) {
    if (paint.getPathEffect()) {
        return false;
    }
    SkScalar width = paint.getStrokeWidth();
    if (0 == width) {
        fMode = mode;
        fPaint = &paint;
        fClip = NULL;
        fRC = rc;
        fRadius = SK_FixedHalf;
        return true;
    }
    if (paint.getStrokeCap() != SkPaint::kRound_Cap &&
            matrix->rectStaysRect() && SkCanvas::kPoints_PointMode == mode) {
        SkScalar sx = matrix->get(SkMatrix::kMScaleX);
        SkScalar sy = matrix->get(SkMatrix::kMScaleY);
        if (SkScalarNearlyZero(sx - sy)) {
            if (sx < 0) {
                sx = -sx;
            }

            fMode = mode;
            fPaint = &paint;
            fClip = NULL;
            fRC = rc;
            fRadius = SkScalarToFixed(SkScalarMul(width, sx)) >> 1;
            return true;
        }
    }
    return false;
}

PtProcRec::Proc PtProcRec::chooseProc(SkBlitter** blitterPtr) {
    Proc proc = NULL;

    SkBlitter* blitter = *blitterPtr;
    if (fRC->isBW()) {
        fClip = &fRC->bwRgn();
    } else {
        fWrapper.init(*fRC, blitter);
        fClip = &fWrapper.getRgn();
        blitter = fWrapper.getBlitter();
        *blitterPtr = blitter;
    }

    // for our arrays
    SkASSERT(0 == SkCanvas::kPoints_PointMode);
    SkASSERT(1 == SkCanvas::kLines_PointMode);
    SkASSERT(2 == SkCanvas::kPolygon_PointMode);
    SkASSERT((unsigned)fMode <= (unsigned)SkCanvas::kPolygon_PointMode);

    if (fPaint->isAntiAlias()) {
        if (0 == fPaint->getStrokeWidth()) {
            static const Proc gAAProcs[] = {
                aa_square_proc, aa_line_hair_proc, aa_poly_hair_proc
            };
            proc = gAAProcs[fMode];
        } else if (fPaint->getStrokeCap() != SkPaint::kRound_Cap) {
            SkASSERT(SkCanvas::kPoints_PointMode == fMode);
            proc = aa_square_proc;
        }
    } else {    // BW
        if (fRadius <= SK_FixedHalf) {    // small radii and hairline
            if (SkCanvas::kPoints_PointMode == fMode && fClip->isRect()) {
                uint32_t value;
                const SkBitmap* bm = blitter->justAnOpaqueColor(&value);
                if (bm && kRGB_565_SkColorType == bm->colorType()) {
                    proc = bw_pt_rect_16_hair_proc;
                } else if (bm && kN32_SkColorType == bm->colorType()) {
                    proc = bw_pt_rect_32_hair_proc;
                } else {
                    proc = bw_pt_rect_hair_proc;
                }
            } else {
                static Proc gBWProcs[] = {
                    bw_pt_hair_proc, bw_line_hair_proc, bw_poly_hair_proc
                };
                proc = gBWProcs[fMode];
            }
        } else {
            proc = bw_square_proc;
        }
    }
    return proc;
}

// each of these costs 8-bytes of stack space, so don't make it too large
// must be even for lines/polygon to work
#define MAX_DEV_PTS     32

void SkDraw::drawPoints(SkCanvas::PointMode mode, size_t count,
                        const SkPoint pts[], const SkPaint& paint,
                        bool forceUseDevice) const {
    // if we're in lines mode, force count to be even
    if (SkCanvas::kLines_PointMode == mode) {
        count &= ~(size_t)1;
    }

    if ((long)count <= 0) {
        return;
    }

    SkASSERT(pts != NULL);
    SkDEBUGCODE(this->validate();)

     // nothing to draw
    if (fRC->isEmpty()) {
        return;
    }

    PtProcRec rec;
    if (!forceUseDevice && rec.init(mode, paint, fMatrix, fRC)) {
        SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint);

        SkPoint             devPts[MAX_DEV_PTS];
        const SkMatrix*     matrix = fMatrix;
        SkBlitter*          bltr = blitter.get();
        PtProcRec::Proc     proc = rec.chooseProc(&bltr);
        // we have to back up subsequent passes if we're in polygon mode
        const size_t backup = (SkCanvas::kPolygon_PointMode == mode);

        do {
            int n = SkToInt(count);
            if (n > MAX_DEV_PTS) {
                n = MAX_DEV_PTS;
            }
            matrix->mapPoints(devPts, pts, n);
            proc(rec, devPts, n, bltr);
            pts += n - backup;
            SkASSERT(SkToInt(count) >= n);
            count -= n;
            if (count > 0) {
                count += backup;
            }
        } while (count != 0);
    } else {
        switch (mode) {
            case SkCanvas::kPoints_PointMode: {
                // temporarily mark the paint as filling.
                SkPaint newPaint(paint);
                newPaint.setStyle(SkPaint::kFill_Style);

                SkScalar width = newPaint.getStrokeWidth();
                SkScalar radius = SkScalarHalf(width);

                if (newPaint.getStrokeCap() == SkPaint::kRound_Cap) {
                    SkPath      path;
                    SkMatrix    preMatrix;

                    path.addCircle(0, 0, radius);
                    for (size_t i = 0; i < count; i++) {
                        preMatrix.setTranslate(pts[i].fX, pts[i].fY);
                        // pass true for the last point, since we can modify
                        // then path then
                        if (fDevice) {
                            fDevice->drawPath(*this, path, newPaint, &preMatrix,
                                              (count-1) == i);
                        } else {
                            this->drawPath(path, newPaint, &preMatrix,
                                           (count-1) == i);
                        }
                    }
                } else {
                    SkRect  r;

                    for (size_t i = 0; i < count; i++) {
                        r.fLeft = pts[i].fX - radius;
                        r.fTop = pts[i].fY - radius;
                        r.fRight = r.fLeft + width;
                        r.fBottom = r.fTop + width;
                        if (fDevice) {
                            fDevice->drawRect(*this, r, newPaint);
                        } else {
                            this->drawRect(r, newPaint);
                        }
                    }
                }
                break;
            }
            case SkCanvas::kLines_PointMode:
#ifndef SK_DISABLE_DASHING_OPTIMIZATION
                if (2 == count && NULL != paint.getPathEffect()) {
                    // most likely a dashed line - see if it is one of the ones
                    // we can accelerate
                    SkStrokeRec rec(paint);
                    SkPathEffect::PointData pointData;

                    SkPath path;
                    path.moveTo(pts[0]);
                    path.lineTo(pts[1]);

                    SkRect cullRect = SkRect::Make(fRC->getBounds());

                    if (paint.getPathEffect()->asPoints(&pointData, path, rec,
                                                        *fMatrix, &cullRect)) {
                        // 'asPoints' managed to find some fast path

                        SkPaint newP(paint);
                        newP.setPathEffect(NULL);
                        newP.setStyle(SkPaint::kFill_Style);

                        if (!pointData.fFirst.isEmpty()) {
                            if (fDevice) {
                                fDevice->drawPath(*this, pointData.fFirst, newP);
                            } else {
                                this->drawPath(pointData.fFirst, newP);
                            }
                        }

                        if (!pointData.fLast.isEmpty()) {
                            if (fDevice) {
                                fDevice->drawPath(*this, pointData.fLast, newP);
                            } else {
                                this->drawPath(pointData.fLast, newP);
                            }
                        }

                        if (pointData.fSize.fX == pointData.fSize.fY) {
                            // The rest of the dashed line can just be drawn as points
                            SkASSERT(pointData.fSize.fX == SkScalarHalf(newP.getStrokeWidth()));

                            if (SkPathEffect::PointData::kCircles_PointFlag & pointData.fFlags) {
                                newP.setStrokeCap(SkPaint::kRound_Cap);
                            } else {
                                newP.setStrokeCap(SkPaint::kButt_Cap);
                            }

                            if (fDevice) {
                                fDevice->drawPoints(*this,
                                                    SkCanvas::kPoints_PointMode,
                                                    pointData.fNumPoints,
                                                    pointData.fPoints,
                                                    newP);
                            } else {
                                this->drawPoints(SkCanvas::kPoints_PointMode,
                                                 pointData.fNumPoints,
                                                 pointData.fPoints,
                                                 newP,
                                                 forceUseDevice);
                            }
                            break;
                        } else {
                            // The rest of the dashed line must be drawn as rects
                            SkASSERT(!(SkPathEffect::PointData::kCircles_PointFlag &
                                      pointData.fFlags));

                            SkRect r;

                            for (int i = 0; i < pointData.fNumPoints; ++i) {
                                r.set(pointData.fPoints[i].fX - pointData.fSize.fX,
                                      pointData.fPoints[i].fY - pointData.fSize.fY,
                                      pointData.fPoints[i].fX + pointData.fSize.fX,
                                      pointData.fPoints[i].fY + pointData.fSize.fY);
                                if (fDevice) {
                                    fDevice->drawRect(*this, r, newP);
                                } else {
                                    this->drawRect(r, newP);
                                }
                            }
                        }

                        break;
                    }
                }
#endif // DISABLE_DASHING_OPTIMIZATION
                // couldn't take fast path so fall through!
            case SkCanvas::kPolygon_PointMode: {
                count -= 1;
                SkPath path;
                SkPaint p(paint);
                p.setStyle(SkPaint::kStroke_Style);
                size_t inc = (SkCanvas::kLines_PointMode == mode) ? 2 : 1;
                for (size_t i = 0; i < count; i += inc) {
                    path.moveTo(pts[i]);
                    path.lineTo(pts[i+1]);
                    if (fDevice) {
                        fDevice->drawPath(*this, path, p, NULL, true);
                    } else {
                        this->drawPath(path, p, NULL, true);
                    }
                    path.rewind();
                }
                break;
            }
        }
    }
}

static bool easy_rect_join(const SkPaint& paint, const SkMatrix& matrix,
                           SkPoint* strokeSize) {
    if (SkPaint::kMiter_Join != paint.getStrokeJoin() ||
        paint.getStrokeMiter() < SK_ScalarSqrt2) {
        return false;
    }

    SkASSERT(matrix.rectStaysRect());
    SkPoint pt = { paint.getStrokeWidth(), paint.getStrokeWidth() };
    matrix.mapVectors(strokeSize, &pt, 1);
    strokeSize->fX = SkScalarAbs(strokeSize->fX);
    strokeSize->fY = SkScalarAbs(strokeSize->fY);
    return true;
}

SkDraw::RectType SkDraw::ComputeRectType(const SkPaint& paint,
                                         const SkMatrix& matrix,
                                         SkPoint* strokeSize) {
    RectType rtype;
    const SkScalar width = paint.getStrokeWidth();
    const bool zeroWidth = (0 == width);
    SkPaint::Style style = paint.getStyle();

    if ((SkPaint::kStrokeAndFill_Style == style) && zeroWidth) {
        style = SkPaint::kFill_Style;
    }

    if (paint.getPathEffect() || paint.getMaskFilter() ||
        paint.getRasterizer() || !matrix.rectStaysRect() ||
        SkPaint::kStrokeAndFill_Style == style) {
        rtype = kPath_RectType;
    } else if (SkPaint::kFill_Style == style) {
        rtype = kFill_RectType;
    } else if (zeroWidth) {
        rtype = kHair_RectType;
    } else if (easy_rect_join(paint, matrix, strokeSize)) {
        rtype = kStroke_RectType;
    } else {
        rtype = kPath_RectType;
    }
    return rtype;
}

static const SkPoint* rect_points(const SkRect& r) {
    return SkTCast<const SkPoint*>(&r);
}

static SkPoint* rect_points(SkRect& r) {
    return SkTCast<SkPoint*>(&r);
}

void SkDraw::drawRect(const SkRect& rect, const SkPaint& paint) const {
    SkDEBUGCODE(this->validate();)

    // nothing to draw
    if (fRC->isEmpty()) {
        return;
    }

    SkPoint strokeSize;
    RectType rtype = ComputeRectType(paint, *fMatrix, &strokeSize);

    if (kPath_RectType == rtype) {
        SkPath  tmp;
        tmp.addRect(rect);
        tmp.setFillType(SkPath::kWinding_FillType);
        this->drawPath(tmp, paint, NULL, true);
        return;
    }

    const SkMatrix& matrix = *fMatrix;
    SkRect          devRect;

    // transform rect into devRect
    matrix.mapPoints(rect_points(devRect), rect_points(rect), 2);
    devRect.sort();

    // look for the quick exit, before we build a blitter
    SkIRect ir;
    devRect.roundOut(&ir);
    if (paint.getStyle() != SkPaint::kFill_Style) {
        // extra space for hairlines
        ir.inset(-1, -1);
    }
    if (fRC->quickReject(ir)) {
        return;
    }

    SkDeviceLooper looper(*fBitmap, *fRC, ir, paint.isAntiAlias());
    while (looper.next()) {
        SkRect localDevRect;
        looper.mapRect(&localDevRect, devRect);
        SkMatrix localMatrix;
        looper.mapMatrix(&localMatrix, matrix);

        SkAutoBlitterChoose blitterStorage(looper.getBitmap(), localMatrix,
                                           paint);
        const SkRasterClip& clip = looper.getRC();
        SkBlitter*          blitter = blitterStorage.get();

        // we want to "fill" if we are kFill or kStrokeAndFill, since in the latter
        // case we are also hairline (if we've gotten to here), which devolves to
        // effectively just kFill
        switch (rtype) {
            case kFill_RectType:
                if (paint.isAntiAlias()) {
                    SkScan::AntiFillRect(localDevRect, clip, blitter);
                } else {
                    SkScan::FillRect(localDevRect, clip, blitter);
                }
                break;
            case kStroke_RectType:
                if (paint.isAntiAlias()) {
                    SkScan::AntiFrameRect(localDevRect, strokeSize, clip, blitter);
                } else {
                    SkScan::FrameRect(localDevRect, strokeSize, clip, blitter);
                }
                break;
            case kHair_RectType:
                if (paint.isAntiAlias()) {
                    SkScan::AntiHairRect(localDevRect, clip, blitter);
                } else {
                    SkScan::HairRect(localDevRect, clip, blitter);
                }
                break;
            default:
                SkDEBUGFAIL("bad rtype");
        }
    }
}

void SkDraw::drawDevMask(const SkMask& srcM, const SkPaint& paint) const {
    if (srcM.fBounds.isEmpty()) {
        return;
    }

    const SkMask* mask = &srcM;

    SkMask dstM;
    if (paint.getMaskFilter() &&
            paint.getMaskFilter()->filterMask(&dstM, srcM, *fMatrix, NULL)) {
        mask = &dstM;
    } else {
        dstM.fImage = NULL;
    }
    SkAutoMaskFreeImage ami(dstM.fImage);

    SkAutoBlitterChoose blitterChooser(*fBitmap, *fMatrix, paint);
    SkBlitter* blitter = blitterChooser.get();

    SkAAClipBlitterWrapper wrapper;
    const SkRegion* clipRgn;

    if (fRC->isBW()) {
        clipRgn = &fRC->bwRgn();
    } else {
        wrapper.init(*fRC, blitter);
        clipRgn = &wrapper.getRgn();
        blitter = wrapper.getBlitter();
    }
    blitter->blitMaskRegion(*mask, *clipRgn);
}

static SkScalar fast_len(const SkVector& vec) {
    SkScalar x = SkScalarAbs(vec.fX);
    SkScalar y = SkScalarAbs(vec.fY);
    if (x < y) {
        SkTSwap(x, y);
    }
    return x + SkScalarHalf(y);
}

static bool xfermodeSupportsCoverageAsAlpha(SkXfermode* xfer) {
    SkXfermode::Coeff dc;
    if (!SkXfermode::AsCoeff(xfer, NULL, &dc)) {
        return false;
    }

    switch (dc) {
        case SkXfermode::kOne_Coeff:
        case SkXfermode::kISA_Coeff:
        case SkXfermode::kISC_Coeff:
            return true;
        default:
            return false;
    }
}

bool SkDrawTreatAAStrokeAsHairline(SkScalar strokeWidth, const SkMatrix& matrix,
                                   SkScalar* coverage) {
    SkASSERT(strokeWidth > 0);
    // We need to try to fake a thick-stroke with a modulated hairline.

    if (matrix.hasPerspective()) {
        return false;
    }

    SkVector src[2], dst[2];
    src[0].set(strokeWidth, 0);
    src[1].set(0, strokeWidth);
    matrix.mapVectors(dst, src, 2);
    SkScalar len0 = fast_len(dst[0]);
    SkScalar len1 = fast_len(dst[1]);
    if (len0 <= SK_Scalar1 && len1 <= SK_Scalar1) {
        if (NULL != coverage) {
            *coverage = SkScalarAve(len0, len1);
        }
        return true;
    }
    return false;
}

void SkDraw::drawRRect(const SkRRect& rrect, const SkPaint& paint) const {
    SkDEBUGCODE(this->validate());

    if (fRC->isEmpty()) {
        return;
    }

    {
        // TODO: Investigate optimizing these options. They are in the same
        // order as SkDraw::drawPath, which handles each case. It may be
        // that there is no way to optimize for these using the SkRRect path.
        SkScalar coverage;
        if (SkDrawTreatAsHairline(paint, *fMatrix, &coverage)) {
            goto DRAW_PATH;
        }

        if (paint.getPathEffect() || paint.getStyle() != SkPaint::kFill_Style) {
            goto DRAW_PATH;
        }

        if (paint.getRasterizer()) {
            goto DRAW_PATH;
        }
    }

    if (paint.getMaskFilter()) {
        // Transform the rrect into device space.
        SkRRect devRRect;
        if (rrect.transform(*fMatrix, &devRRect)) {
            SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint);
            if (paint.getMaskFilter()->filterRRect(devRRect, *fMatrix, *fRC, blitter.get(),
                                                   SkPaint::kFill_Style)) {
                return; // filterRRect() called the blitter, so we're done
            }
        }
    }

DRAW_PATH:
    // Now fall back to the default case of using a path.
    SkPath path;
    path.addRRect(rrect);
    this->drawPath(path, paint, NULL, true);
}

void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint,
                      const SkMatrix* prePathMatrix, bool pathIsMutable,
                      bool drawCoverage) const {
    SkDEBUGCODE(this->validate();)

    // nothing to draw
    if (fRC->isEmpty()) {
        return;
    }

    SkPath*         pathPtr = (SkPath*)&origSrcPath;
    bool            doFill = true;
    SkPath          tmpPath;
    SkMatrix        tmpMatrix;
    const SkMatrix* matrix = fMatrix;

    if (prePathMatrix) {
        if (origPaint.getPathEffect() || origPaint.getStyle() != SkPaint::kFill_Style ||
                origPaint.getRasterizer()) {
            SkPath* result = pathPtr;

            if (!pathIsMutable) {
                result = &tmpPath;
                pathIsMutable = true;
            }
            pathPtr->transform(*prePathMatrix, result);
            pathPtr = result;
        } else {
            tmpMatrix.setConcat(*matrix, *prePathMatrix);
            matrix = &tmpMatrix;
        }
    }
    // at this point we're done with prePathMatrix
    SkDEBUGCODE(prePathMatrix = (const SkMatrix*)0x50FF8001;)

    SkTCopyOnFirstWrite<SkPaint> paint(origPaint);

    {
        SkScalar coverage;
        if (SkDrawTreatAsHairline(origPaint, *matrix, &coverage)) {
            if (SK_Scalar1 == coverage) {
                paint.writable()->setStrokeWidth(0);
            } else if (xfermodeSupportsCoverageAsAlpha(origPaint.getXfermode())) {
                U8CPU newAlpha;
#if 0
                newAlpha = SkToU8(SkScalarRoundToInt(coverage *
                                                     origPaint.getAlpha()));
#else
                // this is the old technique, which we preserve for now so
                // we don't change previous results (testing)
                // the new way seems fine, its just (a tiny bit) different
                int scale = (int)SkScalarMul(coverage, 256);
                newAlpha = origPaint.getAlpha() * scale >> 8;
#endif
                SkPaint* writablePaint = paint.writable();
                writablePaint->setStrokeWidth(0);
                writablePaint->setAlpha(newAlpha);
            }
        }
    }

    if (paint->getPathEffect() || paint->getStyle() != SkPaint::kFill_Style) {
        SkRect cullRect;
        const SkRect* cullRectPtr = NULL;
        if (this->computeConservativeLocalClipBounds(&cullRect)) {
            cullRectPtr = &cullRect;
        }
        doFill = paint->getFillPath(*pathPtr, &tmpPath, cullRectPtr);
        pathPtr = &tmpPath;
    }

    if (paint->getRasterizer()) {
        SkMask  mask;
        if (paint->getRasterizer()->rasterize(*pathPtr, *matrix,
                            &fRC->getBounds(), paint->getMaskFilter(), &mask,
                            SkMask::kComputeBoundsAndRenderImage_CreateMode)) {
            this->drawDevMask(mask, *paint);
            SkMask::FreeImage(mask.fImage);
        }
        return;
    }

    // avoid possibly allocating a new path in transform if we can
    SkPath* devPathPtr = pathIsMutable ? pathPtr : &tmpPath;

    // transform the path into device space
    pathPtr->transform(*matrix, devPathPtr);

    SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, *paint, drawCoverage);

    if (paint->getMaskFilter()) {
        SkPaint::Style style = doFill ? SkPaint::kFill_Style :
            SkPaint::kStroke_Style;
        if (paint->getMaskFilter()->filterPath(*devPathPtr, *fMatrix, *fRC, blitter.get(), style)) {
            return; // filterPath() called the blitter, so we're done
        }
    }

    void (*proc)(const SkPath&, const SkRasterClip&, SkBlitter*);
    if (doFill) {
        if (paint->isAntiAlias()) {
            proc = SkScan::AntiFillPath;
        } else {
            proc = SkScan::FillPath;
        }
    } else {    // hairline
        if (paint->isAntiAlias()) {
            proc = SkScan::AntiHairPath;
        } else {
            proc = SkScan::HairPath;
        }
    }
    proc(*devPathPtr, *fRC, blitter.get());
}

/** For the purposes of drawing bitmaps, if a matrix is "almost" translate
    go ahead and treat it as if it were, so that subsequent code can go fast.
 */
static bool just_translate(const SkMatrix& matrix, const SkBitmap& bitmap) {
    unsigned bits = 0;  // TODO: find a way to allow the caller to tell us to
                        // respect filtering.
    return SkTreatAsSprite(matrix, bitmap.width(), bitmap.height(), bits);
}

void SkDraw::drawBitmapAsMask(const SkBitmap& bitmap,
                              const SkPaint& paint) const {
    SkASSERT(bitmap.colorType() == kAlpha_8_SkColorType);

    if (just_translate(*fMatrix, bitmap)) {
        int ix = SkScalarRoundToInt(fMatrix->getTranslateX());
        int iy = SkScalarRoundToInt(fMatrix->getTranslateY());

        SkAutoLockPixels alp(bitmap);
        if (!bitmap.readyToDraw()) {
            return;
        }

        SkMask  mask;
        mask.fBounds.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());
        mask.fFormat = SkMask::kA8_Format;
        mask.fRowBytes = SkToU32(bitmap.rowBytes());
        mask.fImage = bitmap.getAddr8(0, 0);

        this->drawDevMask(mask, paint);
    } else {    // need to xform the bitmap first
        SkRect  r;
        SkMask  mask;

        r.set(0, 0,
              SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
        fMatrix->mapRect(&r);
        r.round(&mask.fBounds);

        // set the mask's bounds to the transformed bitmap-bounds,
        // clipped to the actual device
        {
            SkIRect    devBounds;
            devBounds.set(0, 0, fBitmap->width(), fBitmap->height());
            // need intersect(l, t, r, b) on irect
            if (!mask.fBounds.intersect(devBounds)) {
                return;
            }
        }

        mask.fFormat = SkMask::kA8_Format;
        mask.fRowBytes = SkAlign4(mask.fBounds.width());
        size_t size = mask.computeImageSize();
        if (0 == size) {
            // the mask is too big to allocated, draw nothing
            return;
        }

        // allocate (and clear) our temp buffer to hold the transformed bitmap
        SkAutoMalloc    storage(size);
        mask.fImage = (uint8_t*)storage.get();
        memset(mask.fImage, 0, size);

        // now draw our bitmap(src) into mask(dst), transformed by the matrix
        {
            SkBitmap    device;
            device.installPixels(SkImageInfo::MakeA8(mask.fBounds.width(), mask.fBounds.height()),
                                 mask.fImage, mask.fRowBytes);

            SkCanvas c(device);
            // need the unclipped top/left for the translate
            c.translate(-SkIntToScalar(mask.fBounds.fLeft),
                        -SkIntToScalar(mask.fBounds.fTop));
            c.concat(*fMatrix);

            // We can't call drawBitmap, or we'll infinitely recurse. Instead
            // we manually build a shader and draw that into our new mask
            SkPaint tmpPaint;
            tmpPaint.setFlags(paint.getFlags());
            SkAutoBitmapShaderInstall install(bitmap, tmpPaint);
            SkRect rr;
            rr.set(0, 0, SkIntToScalar(bitmap.width()),
                   SkIntToScalar(bitmap.height()));
            c.drawRect(rr, install.paintWithShader());
        }
        this->drawDevMask(mask, paint);
    }
}

static bool clipped_out(const SkMatrix& m, const SkRasterClip& c,
                        const SkRect& srcR) {
    SkRect  dstR;
    SkIRect devIR;

    m.mapRect(&dstR, srcR);
    dstR.roundOut(&devIR);
    return c.quickReject(devIR);
}

static bool clipped_out(const SkMatrix& matrix, const SkRasterClip& clip,
                        int width, int height) {
    SkRect  r;
    r.set(0, 0, SkIntToScalar(width), SkIntToScalar(height));
    return clipped_out(matrix, clip, r);
}

static bool clipHandlesSprite(const SkRasterClip& clip, int x, int y,
                              const SkBitmap& bitmap) {
    return clip.isBW() ||
           clip.quickContains(x, y, x + bitmap.width(), y + bitmap.height());
}

void SkDraw::drawBitmap(const SkBitmap& bitmap, const SkMatrix& prematrix,
                        const SkPaint& origPaint) const {
    SkDEBUGCODE(this->validate();)

    // nothing to draw
    if (fRC->isEmpty() ||
            bitmap.width() == 0 || bitmap.height() == 0 ||
            bitmap.colorType() == kUnknown_SkColorType) {
        return;
    }

    SkPaint paint(origPaint);
    paint.setStyle(SkPaint::kFill_Style);

    SkMatrix matrix;
    matrix.setConcat(*fMatrix, prematrix);

    if (clipped_out(matrix, *fRC, bitmap.width(), bitmap.height())) {
        return;
    }

    if (bitmap.colorType() != kAlpha_8_SkColorType && just_translate(matrix, bitmap)) {
        //
        // It is safe to call lock pixels now, since we know the matrix is
        // (more or less) identity.
        //
        SkAutoLockPixels alp(bitmap);
        if (!bitmap.readyToDraw()) {
            return;
        }
        int ix = SkScalarRoundToInt(matrix.getTranslateX());
        int iy = SkScalarRoundToInt(matrix.getTranslateY());
        if (clipHandlesSprite(*fRC, ix, iy, bitmap)) {
            SkTBlitterAllocator allocator;
            // blitter will be owned by the allocator.
            SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap,
                                                         ix, iy, &allocator);
            if (blitter) {
                SkIRect    ir;
                ir.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());

                SkScan::FillIRect(ir, *fRC, blitter);
                return;
            }
        }
    }

    // now make a temp draw on the stack, and use it
    //
    SkDraw draw(*this);
    draw.fMatrix = &matrix;

    if (bitmap.colorType() == kAlpha_8_SkColorType) {
        draw.drawBitmapAsMask(bitmap, paint);
    } else {
        SkAutoBitmapShaderInstall install(bitmap, paint);

        SkRect  r;
        r.set(0, 0, SkIntToScalar(bitmap.width()),
              SkIntToScalar(bitmap.height()));
        // is this ok if paint has a rasterizer?
        draw.drawRect(r, install.paintWithShader());
    }
}

void SkDraw::drawSprite(const SkBitmap& bitmap, int x, int y,
                        const SkPaint& origPaint) const {
    SkDEBUGCODE(this->validate();)

    // nothing to draw
    if (fRC->isEmpty() ||
            bitmap.width() == 0 || bitmap.height() == 0 ||
            bitmap.colorType() == kUnknown_SkColorType) {
        return;
    }

    SkIRect    bounds;
    bounds.set(x, y, x + bitmap.width(), y + bitmap.height());

    if (fRC->quickReject(bounds)) {
        return; // nothing to draw
    }

    SkPaint paint(origPaint);
    paint.setStyle(SkPaint::kFill_Style);

    if (NULL == paint.getColorFilter() && clipHandlesSprite(*fRC, x, y, bitmap)) {
        SkTBlitterAllocator allocator;
        // blitter will be owned by the allocator.
        SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap,
                                                     x, y, &allocator);

        if (blitter) {
            SkScan::FillIRect(bounds, *fRC, blitter);
            return;
        }
    }

    SkMatrix        matrix;
    SkRect          r;

    // get a scalar version of our rect
    r.set(bounds);

    // create shader with offset
    matrix.setTranslate(r.fLeft, r.fTop);
    SkAutoBitmapShaderInstall install(bitmap, paint, &matrix);
    const SkPaint& shaderPaint = install.paintWithShader();

    SkDraw draw(*this);
    matrix.reset();
    draw.fMatrix = &matrix;
    // call ourself with a rect
    // is this OK if paint has a rasterizer?
    draw.drawRect(r, shaderPaint);
}

///////////////////////////////////////////////////////////////////////////////

#include "SkScalerContext.h"
#include "SkGlyphCache.h"
#include "SkTextToPathIter.h"
#include "SkUtils.h"

static void measure_text(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
                const char text[], size_t byteLength, SkVector* stopVector) {
    SkFixed     x = 0, y = 0;
    const char* stop = text + byteLength;

    SkAutoKern  autokern;

    while (text < stop) {
        // don't need x, y here, since all subpixel variants will have the
        // same advance
        const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);

        x += autokern.adjust(glyph) + glyph.fAdvanceX;
        y += glyph.fAdvanceY;
    }
    stopVector->set(SkFixedToScalar(x), SkFixedToScalar(y));

    SkASSERT(text == stop);
}

bool SkDraw::ShouldDrawTextAsPaths(const SkPaint& paint, const SkMatrix& ctm) {
    // hairline glyphs are fast enough so we don't need to cache them
    if (SkPaint::kStroke_Style == paint.getStyle() && 0 == paint.getStrokeWidth()) {
        return true;
    }

    // we don't cache perspective
    if (ctm.hasPerspective()) {
        return true;
    }

    SkMatrix textM;
    return SkPaint::TooBigToUseCache(ctm, *paint.setTextMatrix(&textM));
}

void SkDraw::drawText_asPaths(const char text[], size_t byteLength,
                              SkScalar x, SkScalar y,
                              const SkPaint& paint) const {
    SkDEBUGCODE(this->validate();)

    SkTextToPathIter iter(text, byteLength, paint, true);

    SkMatrix    matrix;
    matrix.setScale(iter.getPathScale(), iter.getPathScale());
    matrix.postTranslate(x, y);

    const SkPath* iterPath;
    SkScalar xpos, prevXPos = 0;

    while (iter.next(&iterPath, &xpos)) {
        matrix.postTranslate(xpos - prevXPos, 0);
        if (iterPath) {
            const SkPaint& pnt = iter.getPaint();
            if (fDevice) {
                fDevice->drawPath(*this, *iterPath, pnt, &matrix, false);
            } else {
                this->drawPath(*iterPath, pnt, &matrix, false);
            }
        }
        prevXPos = xpos;
    }
}

// disable warning : local variable used without having been initialized
#if defined _WIN32 && _MSC_VER >= 1300
#pragma warning ( push )
#pragma warning ( disable : 4701 )
#endif

//////////////////////////////////////////////////////////////////////////////

static void D1G_RectClip(const SkDraw1Glyph& state, SkFixed fx, SkFixed fy, const SkGlyph& glyph) {
    int left = SkFixedFloorToInt(fx);
    int top = SkFixedFloorToInt(fy);
    SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
    SkASSERT((NULL == state.fClip && state.fAAClip) ||
             (state.fClip && NULL == state.fAAClip && state.fClip->isRect()));

    left += glyph.fLeft;
    top  += glyph.fTop;

    int right   = left + glyph.fWidth;
    int bottom  = top + glyph.fHeight;

    SkMask        mask;
    SkIRect        storage;
    SkIRect*    bounds = &mask.fBounds;

    mask.fBounds.set(left, top, right, bottom);

    // this extra test is worth it, assuming that most of the time it succeeds
    // since we can avoid writing to storage
    if (!state.fClipBounds.containsNoEmptyCheck(left, top, right, bottom)) {
        if (!storage.intersectNoEmptyCheck(mask.fBounds, state.fClipBounds))
            return;
        bounds = &storage;
    }

    uint8_t* aa = (uint8_t*)glyph.fImage;
    if (NULL == aa) {
        aa = (uint8_t*)state.fCache->findImage(glyph);
        if (NULL == aa) {
            return; // can't rasterize glyph
        }
    }

    mask.fRowBytes = glyph.rowBytes();
    mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
    mask.fImage = aa;
    state.blitMask(mask, *bounds);
}

static void D1G_RgnClip(const SkDraw1Glyph& state, SkFixed fx, SkFixed fy, const SkGlyph& glyph) {
    int left = SkFixedFloorToInt(fx);
    int top = SkFixedFloorToInt(fy);
    SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
    SkASSERT(!state.fClip->isRect());

    SkMask  mask;

    left += glyph.fLeft;
    top  += glyph.fTop;

    mask.fBounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight);
    SkRegion::Cliperator clipper(*state.fClip, mask.fBounds);

    if (!clipper.done()) {
        const SkIRect&  cr = clipper.rect();
        const uint8_t*  aa = (const uint8_t*)glyph.fImage;
        if (NULL == aa) {
            aa = (uint8_t*)state.fCache->findImage(glyph);
            if (NULL == aa) {
                return;
            }
        }

        mask.fRowBytes = glyph.rowBytes();
        mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
        mask.fImage = (uint8_t*)aa;
        do {
            state.blitMask(mask, cr);
            clipper.next();
        } while (!clipper.done());
    }
}

static bool hasCustomD1GProc(const SkDraw& draw) {
    return draw.fProcs && draw.fProcs->fD1GProc;
}

static bool needsRasterTextBlit(const SkDraw& draw) {
    return !hasCustomD1GProc(draw);
}

SkDraw1Glyph::Proc SkDraw1Glyph::init(const SkDraw* draw, SkBlitter* blitter, SkGlyphCache* cache,
                                      const SkPaint& pnt) {
    fDraw = draw;
    fBlitter = blitter;
    fCache = cache;
    fPaint = &pnt;

    if (cache->isSubpixel()) {
        fHalfSampleX = fHalfSampleY = (SK_FixedHalf >> SkGlyph::kSubBits);
    } else {
        fHalfSampleX = fHalfSampleY = SK_FixedHalf;
    }

    if (hasCustomD1GProc(*draw)) {
        // todo: fix this assumption about clips w/ custom
        fClip = draw->fClip;
        fClipBounds = fClip->getBounds();
        return draw->fProcs->fD1GProc;
    }

    if (draw->fRC->isBW()) {
        fAAClip = NULL;
        fClip = &draw->fRC->bwRgn();
        fClipBounds = fClip->getBounds();
        if (fClip->isRect()) {
            return D1G_RectClip;
        } else {
            return D1G_RgnClip;
        }
    } else {    // aaclip
        fAAClip = &draw->fRC->aaRgn();
        fClip = NULL;
        fClipBounds = fAAClip->getBounds();
        return D1G_RectClip;
    }
}

void SkDraw1Glyph::blitMaskAsSprite(const SkMask& mask) const {
    SkASSERT(SkMask::kARGB32_Format == mask.fFormat);

    SkBitmap bm;
    bm.installPixels(SkImageInfo::MakeN32Premul(mask.fBounds.width(), mask.fBounds.height()),
                     (SkPMColor*)mask.fImage, mask.fRowBytes);

    fDraw->drawSprite(bm, mask.fBounds.x(), mask.fBounds.y(), *fPaint);
}

///////////////////////////////////////////////////////////////////////////////

void SkDraw::drawText(const char text[], size_t byteLength,
                      SkScalar x, SkScalar y, const SkPaint& paint) const {
    SkASSERT(byteLength == 0 || text != NULL);

    SkDEBUGCODE(this->validate();)

    // nothing to draw
    if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
        return;
    }

    // SkScalarRec doesn't currently have a way of representing hairline stroke and
    // will fill if its frame-width is 0.
    if (ShouldDrawTextAsPaths(paint, *fMatrix)) {
        this->drawText_asPaths(text, byteLength, x, y, paint);
        return;
    }

    SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc();

    SkAutoGlyphCache    autoCache(paint, &fDevice->fLeakyProperties, fMatrix);
    SkGlyphCache*       cache = autoCache.getCache();

    // transform our starting point
    {
        SkPoint loc;
        fMatrix->mapXY(x, y, &loc);
        x = loc.fX;
        y = loc.fY;
    }

    // need to measure first
    if (paint.getTextAlign() != SkPaint::kLeft_Align) {
        SkVector    stop;

        measure_text(cache, glyphCacheProc, text, byteLength, &stop);

        SkScalar    stopX = stop.fX;
        SkScalar    stopY = stop.fY;

        if (paint.getTextAlign() == SkPaint::kCenter_Align) {
            stopX = SkScalarHalf(stopX);
            stopY = SkScalarHalf(stopY);
        }
        x -= stopX;
        y -= stopY;
    }

    const char* stop = text + byteLength;

    SkAAClipBlitter     aaBlitter;
    SkAutoBlitterChoose blitterChooser;
    SkBlitter*          blitter = NULL;
    if (needsRasterTextBlit(*this)) {
        blitterChooser.choose(*fBitmap, *fMatrix, paint);
        blitter = blitterChooser.get();
        if (fRC->isAA()) {
            aaBlitter.init(blitter, &fRC->aaRgn());
            blitter = &aaBlitter;
        }
    }

    SkAutoKern          autokern;
    SkDraw1Glyph        d1g;
    SkDraw1Glyph::Proc  proc = d1g.init(this, blitter, cache, paint);

    SkFixed fxMask = ~0;
    SkFixed fyMask = ~0;
    if (cache->isSubpixel()) {
        SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*fMatrix);
        if (kX_SkAxisAlignment == baseline) {
            fyMask = 0;
            d1g.fHalfSampleY = SK_FixedHalf;
        } else if (kY_SkAxisAlignment == baseline) {
            fxMask = 0;
            d1g.fHalfSampleX = SK_FixedHalf;
        }
    }

    SkFixed fx = SkScalarToFixed(x) + d1g.fHalfSampleX;
    SkFixed fy = SkScalarToFixed(y) + d1g.fHalfSampleY;

    while (text < stop) {
        const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask);

        fx += autokern.adjust(glyph);

        if (glyph.fWidth) {
            proc(d1g, fx, fy, glyph);
        }

        fx += glyph.fAdvanceX;
        fy += glyph.fAdvanceY;
    }
}

//////////////////////////////////////////////////////////////////////////////

void SkDraw::drawPosText_asPaths(const char text[], size_t byteLength,
                                 const SkScalar pos[], SkScalar constY,
                                 int scalarsPerPosition,
                                 const SkPaint& origPaint) const {
    // setup our std paint, in hopes of getting hits in the cache
    SkPaint paint(origPaint);
    SkScalar matrixScale = paint.setupForAsPaths();

    SkMatrix matrix;
    matrix.setScale(matrixScale, matrixScale);

    // Temporarily jam in kFill, so we only ever ask for the raw outline from the cache.
    paint.setStyle(SkPaint::kFill_Style);
    paint.setPathEffect(NULL);

    SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
    SkAutoGlyphCache    autoCache(paint, NULL, NULL);
    SkGlyphCache*       cache = autoCache.getCache();

    const char*        stop = text + byteLength;
    SkTextAlignProcScalar alignProc(paint.getTextAlign());
    SkTextMapStateProc tmsProc(SkMatrix::I(), constY, scalarsPerPosition);

    // Now restore the original settings, so we "draw" with whatever style/stroking.
    paint.setStyle(origPaint.getStyle());
    paint.setPathEffect(origPaint.getPathEffect());

    while (text < stop) {
        const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
        if (glyph.fWidth) {
            const SkPath* path = cache->findPath(glyph);
            if (path) {
                SkPoint tmsLoc;
                tmsProc(pos, &tmsLoc);
                SkPoint loc;
                alignProc(tmsLoc, glyph, &loc);

                matrix[SkMatrix::kMTransX] = loc.fX;
                matrix[SkMatrix::kMTransY] = loc.fY;
                if (fDevice) {
                    fDevice->drawPath(*this, *path, paint, &matrix, false);
                } else {
                    this->drawPath(*path, paint, &matrix, false);
                }
            }
        }
        pos += scalarsPerPosition;
    }
}

void SkDraw::drawPosText(const char text[], size_t byteLength,
                         const SkScalar pos[], SkScalar constY,
                         int scalarsPerPosition, const SkPaint& paint) const {
    SkASSERT(byteLength == 0 || text != NULL);
    SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);

    SkDEBUGCODE(this->validate();)

    // nothing to draw
    if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
        return;
    }

    if (ShouldDrawTextAsPaths(paint, *fMatrix)) {
        this->drawPosText_asPaths(text, byteLength, pos, constY,
                                  scalarsPerPosition, paint);
        return;
    }

    SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
    SkAutoGlyphCache    autoCache(paint, &fDevice->fLeakyProperties, fMatrix);
    SkGlyphCache*       cache = autoCache.getCache();

    SkAAClipBlitterWrapper wrapper;
    SkAutoBlitterChoose blitterChooser;
    SkBlitter* blitter = NULL;
    if (needsRasterTextBlit(*this)) {
        blitterChooser.choose(*fBitmap, *fMatrix, paint);
        blitter = blitterChooser.get();
        if (fRC->isAA()) {
            wrapper.init(*fRC, blitter);
            blitter = wrapper.getBlitter();
        }
    }

    const char*        stop = text + byteLength;
    SkTextAlignProc    alignProc(paint.getTextAlign());
    SkDraw1Glyph       d1g;
    SkDraw1Glyph::Proc proc = d1g.init(this, blitter, cache, paint);
    SkTextMapStateProc tmsProc(*fMatrix, constY, scalarsPerPosition);

    if (cache->isSubpixel()) {
        // maybe we should skip the rounding if linearText is set
        SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*fMatrix);

        SkFixed fxMask = ~0;
        SkFixed fyMask = ~0;
        if (kX_SkAxisAlignment == baseline) {
            fyMask = 0;
#ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
            d1g.fHalfSampleY = SK_FixedHalf;
#endif
        } else if (kY_SkAxisAlignment == baseline) {
            fxMask = 0;
#ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
            d1g.fHalfSampleX = SK_FixedHalf;
#endif
        }

        if (SkPaint::kLeft_Align == paint.getTextAlign()) {
            while (text < stop) {
                SkPoint tmsLoc;
                tmsProc(pos, &tmsLoc);
                SkFixed fx = SkScalarToFixed(tmsLoc.fX) + d1g.fHalfSampleX;
                SkFixed fy = SkScalarToFixed(tmsLoc.fY) + d1g.fHalfSampleY;

                const SkGlyph& glyph = glyphCacheProc(cache, &text,
                                                      fx & fxMask, fy & fyMask);

                if (glyph.fWidth) {
                    proc(d1g, fx, fy, glyph);
                }
                pos += scalarsPerPosition;
            }
        } else {
            while (text < stop) {
                const char* currentText = text;
                const SkGlyph& metricGlyph = glyphCacheProc(cache, &text, 0, 0);

                if (metricGlyph.fWidth) {
                    SkDEBUGCODE(SkFixed prevAdvX = metricGlyph.fAdvanceX;)
                    SkDEBUGCODE(SkFixed prevAdvY = metricGlyph.fAdvanceY;)
                    SkPoint tmsLoc;
                    tmsProc(pos, &tmsLoc);
                    SkIPoint fixedLoc;
                    alignProc(tmsLoc, metricGlyph, &fixedLoc);

                    SkFixed fx = fixedLoc.fX + d1g.fHalfSampleX;
                    SkFixed fy = fixedLoc.fY + d1g.fHalfSampleY;

                    // have to call again, now that we've been "aligned"
                    const SkGlyph& glyph = glyphCacheProc(cache, &currentText,
                                                          fx & fxMask, fy & fyMask);
                    // the assumption is that the metrics haven't changed
                    SkASSERT(prevAdvX == glyph.fAdvanceX);
                    SkASSERT(prevAdvY == glyph.fAdvanceY);
                    SkASSERT(glyph.fWidth);

                    proc(d1g, fx, fy, glyph);
                }
                pos += scalarsPerPosition;
            }
        }
    } else {    // not subpixel
        if (SkPaint::kLeft_Align == paint.getTextAlign()) {
            while (text < stop) {
                // the last 2 parameters are ignored
                const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);

                if (glyph.fWidth) {
                    SkPoint tmsLoc;
                    tmsProc(pos, &tmsLoc);

                    proc(d1g,
                         SkScalarToFixed(tmsLoc.fX) + SK_FixedHalf, //d1g.fHalfSampleX,
                         SkScalarToFixed(tmsLoc.fY) + SK_FixedHalf, //d1g.fHalfSampleY,
                         glyph);
                }
                pos += scalarsPerPosition;
            }
        } else {
            while (text < stop) {
                // the last 2 parameters are ignored
                const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);

                if (glyph.fWidth) {
                    SkPoint tmsLoc;
                    tmsProc(pos, &tmsLoc);

                    SkIPoint fixedLoc;
                    alignProc(tmsLoc, glyph, &fixedLoc);

                    proc(d1g,
                         fixedLoc.fX + SK_FixedHalf, //d1g.fHalfSampleX,
                         fixedLoc.fY + SK_FixedHalf, //d1g.fHalfSampleY,
                         glyph);
                }
                pos += scalarsPerPosition;
            }
        }
    }
}

#if defined _WIN32 && _MSC_VER >= 1300
#pragma warning ( pop )
#endif

///////////////////////////////////////////////////////////////////////////////

#include "SkPathMeasure.h"

static void morphpoints(SkPoint dst[], const SkPoint src[], int count,
                        SkPathMeasure& meas, const SkMatrix& matrix) {
    SkMatrix::MapXYProc proc = matrix.getMapXYProc();

    for (int i = 0; i < count; i++) {
        SkPoint pos;
        SkVector tangent;

        proc(matrix, src[i].fX, src[i].fY, &pos);
        SkScalar sx = pos.fX;
        SkScalar sy = pos.fY;

        if (!meas.getPosTan(sx, &pos, &tangent)) {
            // set to 0 if the measure failed, so that we just set dst == pos
            tangent.set(0, 0);
        }

        /*  This is the old way (that explains our approach but is way too slow
            SkMatrix    matrix;
            SkPoint     pt;

            pt.set(sx, sy);
            matrix.setSinCos(tangent.fY, tangent.fX);
            matrix.preTranslate(-sx, 0);
            matrix.postTranslate(pos.fX, pos.fY);
            matrix.mapPoints(&dst[i], &pt, 1);
        */
        dst[i].set(pos.fX - SkScalarMul(tangent.fY, sy),
                   pos.fY + SkScalarMul(tangent.fX, sy));
    }
}

/*  TODO

    Need differentially more subdivisions when the follow-path is curvy. Not sure how to
    determine that, but we need it. I guess a cheap answer is let the caller tell us,
    but that seems like a cop-out. Another answer is to get Rob Johnson to figure it out.
*/
static void morphpath(SkPath* dst, const SkPath& src, SkPathMeasure& meas,
                      const SkMatrix& matrix) {
    SkPath::Iter    iter(src, false);
    SkPoint         srcP[4], dstP[3];
    SkPath::Verb    verb;

    while ((verb = iter.next(srcP)) != SkPath::kDone_Verb) {
        switch (verb) {
            case SkPath::kMove_Verb:
                morphpoints(dstP, srcP, 1, meas, matrix);
                dst->moveTo(dstP[0]);
                break;
            case SkPath::kLine_Verb:
                // turn lines into quads to look bendy
                srcP[0].fX = SkScalarAve(srcP[0].fX, srcP[1].fX);
                srcP[0].fY = SkScalarAve(srcP[0].fY, srcP[1].fY);
                morphpoints(dstP, srcP, 2, meas, matrix);
                dst->quadTo(dstP[0], dstP[1]);
                break;
            case SkPath::kQuad_Verb:
                morphpoints(dstP, &srcP[1], 2, meas, matrix);
                dst->quadTo(dstP[0], dstP[1]);
                break;
            case SkPath::kCubic_Verb:
                morphpoints(dstP, &srcP[1], 3, meas, matrix);
                dst->cubicTo(dstP[0], dstP[1], dstP[2]);
                break;
            case SkPath::kClose_Verb:
                dst->close();
                break;
            default:
                SkDEBUGFAIL("unknown verb");
                break;
        }
    }
}

void SkDraw::drawTextOnPath(const char text[], size_t byteLength,
                            const SkPath& follow, const SkMatrix* matrix,
                            const SkPaint& paint) const {
    SkASSERT(byteLength == 0 || text != NULL);

    // nothing to draw
    if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
        return;
    }

    SkTextToPathIter    iter(text, byteLength, paint, true);
    SkPathMeasure       meas(follow, false);
    SkScalar            hOffset = 0;

    // need to measure first
    if (paint.getTextAlign() != SkPaint::kLeft_Align) {
        SkScalar pathLen = meas.getLength();
        if (paint.getTextAlign() == SkPaint::kCenter_Align) {
            pathLen = SkScalarHalf(pathLen);
        }
        hOffset += pathLen;
    }

    const SkPath*   iterPath;
    SkScalar        xpos;
    SkMatrix        scaledMatrix;
    SkScalar        scale = iter.getPathScale();

    scaledMatrix.setScale(scale, scale);

    while (iter.next(&iterPath, &xpos)) {
        if (iterPath) {
            SkPath      tmp;
            SkMatrix    m(scaledMatrix);

            m.postTranslate(xpos + hOffset, 0);
            if (matrix) {
                m.postConcat(*matrix);
            }
            morphpath(&tmp, *iterPath, meas, m);
            if (fDevice) {
                fDevice->drawPath(*this, tmp, iter.getPaint(), NULL, true);
            } else {
                this->drawPath(tmp, iter.getPaint(), NULL, true);
            }
        }
    }
}

///////////////////////////////////////////////////////////////////////////////

typedef void (*HairProc)(const SkPoint&, const SkPoint&, const SkRasterClip&,
                         SkBlitter*);

static HairProc ChooseHairProc(bool doAntiAlias) {
    return doAntiAlias ? SkScan::AntiHairLine : SkScan::HairLine;
}

static bool texture_to_matrix(const VertState& state, const SkPoint verts[],
                              const SkPoint texs[], SkMatrix* matrix) {
    SkPoint src[3], dst[3];

    src[0] = texs[state.f0];
    src[1] = texs[state.f1];
    src[2] = texs[state.f2];
    dst[0] = verts[state.f0];
    dst[1] = verts[state.f1];
    dst[2] = verts[state.f2];
    return matrix->setPolyToPoly(src, dst, 3);
}

class SkTriColorShader : public SkShader {
public:
    SkTriColorShader() {}

    virtual size_t contextSize() const SK_OVERRIDE;

    class TriColorShaderContext : public SkShader::Context {
    public:
        TriColorShaderContext(const SkTriColorShader& shader, const ContextRec&);
        virtual ~TriColorShaderContext();

        bool setup(const SkPoint pts[], const SkColor colors[], int, int, int);

        virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;

    private:
        SkMatrix    fDstToUnit;
        SkPMColor   fColors[3];

        typedef SkShader::Context INHERITED;
    };

    SK_TO_STRING_OVERRIDE()
    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTriColorShader)

protected:
    SkTriColorShader(SkReadBuffer& buffer) : SkShader(buffer) {}

    virtual Context* onCreateContext(const ContextRec& rec, void* storage) const SK_OVERRIDE {
        return SkNEW_PLACEMENT_ARGS(storage, TriColorShaderContext, (*this, rec));
    }

private:
    typedef SkShader INHERITED;
};

bool SkTriColorShader::TriColorShaderContext::setup(const SkPoint pts[], const SkColor colors[],
                                                    int index0, int index1, int index2) {

    fColors[0] = SkPreMultiplyColor(colors[index0]);
    fColors[1] = SkPreMultiplyColor(colors[index1]);
    fColors[2] = SkPreMultiplyColor(colors[index2]);

    SkMatrix m, im;
    m.reset();
    m.set(0, pts[index1].fX - pts[index0].fX);
    m.set(1, pts[index2].fX - pts[index0].fX);
    m.set(2, pts[index0].fX);
    m.set(3, pts[index1].fY - pts[index0].fY);
    m.set(4, pts[index2].fY - pts[index0].fY);
    m.set(5, pts[index0].fY);
    if (!m.invert(&im)) {
        return false;
    }
    // We can't call getTotalInverse(), because we explicitly don't want to look at the localmatrix
    // as our interators are intrinsically tied to the vertices, and nothing else.
    SkMatrix ctmInv;
    if (!this->getCTM().invert(&ctmInv)) {
        return false;
    }
    fDstToUnit.setConcat(im, ctmInv);
    return true;
}

#include "SkColorPriv.h"
#include "SkComposeShader.h"

static int ScalarTo256(SkScalar v) {
    int scale = SkScalarToFixed(v) >> 8;
    if (scale < 0) {
        scale = 0;
    }
    if (scale > 255) {
        scale = 255;
    }
    return SkAlpha255To256(scale);
}


SkTriColorShader::TriColorShaderContext::TriColorShaderContext(const SkTriColorShader& shader,
                                                               const ContextRec& rec)
    : INHERITED(shader, rec) {}

SkTriColorShader::TriColorShaderContext::~TriColorShaderContext() {}

size_t SkTriColorShader::contextSize() const {
    return sizeof(TriColorShaderContext);
}
void SkTriColorShader::TriColorShaderContext::shadeSpan(int x, int y, SkPMColor dstC[], int count) {
    const int alphaScale = Sk255To256(this->getPaintAlpha());

    SkPoint src;

    for (int i = 0; i < count; i++) {
        fDstToUnit.mapXY(SkIntToScalar(x), SkIntToScalar(y), &src);
        x += 1;

        int scale1 = ScalarTo256(src.fX);
        int scale2 = ScalarTo256(src.fY);
        int scale0 = 256 - scale1 - scale2;
        if (scale0 < 0) {
            if (scale1 > scale2) {
                scale2 = 256 - scale1;
            } else {
                scale1 = 256 - scale2;
            }
            scale0 = 0;
        }

        if (256 != alphaScale) {
            scale0 = SkAlphaMul(scale0, alphaScale);
            scale1 = SkAlphaMul(scale1, alphaScale);
            scale2 = SkAlphaMul(scale2, alphaScale);
        }

        dstC[i] = SkAlphaMulQ(fColors[0], scale0) +
                  SkAlphaMulQ(fColors[1], scale1) +
                  SkAlphaMulQ(fColors[2], scale2);
    }
}

#ifndef SK_IGNORE_TO_STRING
void SkTriColorShader::toString(SkString* str) const {
    str->append("SkTriColorShader: (");

    this->INHERITED::toString(str);

    str->append(")");
}
#endif

void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count,
                          const SkPoint vertices[], const SkPoint textures[],
                          const SkColor colors[], SkXfermode* xmode,
                          const uint16_t indices[], int indexCount,
                          const SkPaint& paint) const {
    SkASSERT(0 == count || NULL != vertices);

    // abort early if there is nothing to draw
    if (count < 3 || (indices && indexCount < 3) || fRC->isEmpty()) {
        return;
    }

    // transform out vertices into device coordinates
    SkAutoSTMalloc<16, SkPoint> storage(count);
    SkPoint* devVerts = storage.get();
    fMatrix->mapPoints(devVerts, vertices, count);

    /*
        We can draw the vertices in 1 of 4 ways:

        - solid color (no shader/texture[], no colors[])
        - just colors (no shader/texture[], has colors[])
        - just texture (has shader/texture[], no colors[])
        - colors * texture (has shader/texture[], has colors[])

        Thus for texture drawing, we need both texture[] and a shader.
    */

    SkTriColorShader triShader; // must be above declaration of p
    SkPaint p(paint);

    SkShader* shader = p.getShader();
    if (NULL == shader) {
        // if we have no shader, we ignore the texture coordinates
        textures = NULL;
    } else if (NULL == textures) {
        // if we don't have texture coordinates, ignore the shader
        p.setShader(NULL);
        shader = NULL;
    }

    // setup the custom shader (if needed)
    SkAutoTUnref<SkComposeShader> composeShader;
    if (NULL != colors) {
        if (NULL == textures) {
            // just colors (no texture)
            shader = p.setShader(&triShader);
        } else {
            // colors * texture
            SkASSERT(shader);
            bool releaseMode = false;
            if (NULL == xmode) {
                xmode = SkXfermode::Create(SkXfermode::kModulate_Mode);
                releaseMode = true;
            }
            composeShader.reset(SkNEW_ARGS(SkComposeShader, (&triShader, shader, xmode)));
            p.setShader(composeShader);
            if (releaseMode) {
                xmode->unref();
            }
        }
    }

    SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, p);
    // Abort early if we failed to create a shader context.
    if (blitter->isNullBlitter()) {
        return;
    }

    // setup our state and function pointer for iterating triangles
    VertState       state(count, indices, indexCount);
    VertState::Proc vertProc = state.chooseProc(vmode);

    if (NULL != textures || NULL != colors) {
        while (vertProc(&state)) {
            if (NULL != textures) {
                SkMatrix tempM;
                if (texture_to_matrix(state, vertices, textures, &tempM)) {
                    SkShader::ContextRec rec(*fBitmap, p, *fMatrix);
                    rec.fLocalMatrix = &tempM;
                    if (!blitter->resetShaderContext(rec)) {
                        continue;
                    }
                }
            }
            if (NULL != colors) {
                // Find the context for triShader.
                SkTriColorShader::TriColorShaderContext* triColorShaderContext;

                SkShader::Context* shaderContext = blitter->getShaderContext();
                SkASSERT(shaderContext);
                if (p.getShader() == &triShader) {
                    triColorShaderContext =
                            static_cast<SkTriColorShader::TriColorShaderContext*>(shaderContext);
                } else {
                    // The shader is a compose shader and triShader is its first shader.
                    SkASSERT(p.getShader() == composeShader);
                    SkASSERT(composeShader->getShaderA() == &triShader);
                    SkComposeShader::ComposeShaderContext* composeShaderContext =
                            static_cast<SkComposeShader::ComposeShaderContext*>(shaderContext);
                    SkShader::Context* shaderContextA = composeShaderContext->getShaderContextA();
                    triColorShaderContext =
                            static_cast<SkTriColorShader::TriColorShaderContext*>(shaderContextA);
                }

                if (!triColorShaderContext->setup(vertices, colors,
                                                  state.f0, state.f1, state.f2)) {
                    continue;
                }
            }

            SkPoint tmp[] = {
                devVerts[state.f0], devVerts[state.f1], devVerts[state.f2]
            };
            SkScan::FillTriangle(tmp, *fRC, blitter.get());
        }
    } else {
        // no colors[] and no texture, stroke hairlines with paint's color.
        HairProc hairProc = ChooseHairProc(paint.isAntiAlias());
        const SkRasterClip& clip = *fRC;
        while (vertProc(&state)) {
            hairProc(devVerts[state.f0], devVerts[state.f1], clip, blitter.get());
            hairProc(devVerts[state.f1], devVerts[state.f2], clip, blitter.get());
            hairProc(devVerts[state.f2], devVerts[state.f0], clip, blitter.get());
        }
    }
}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

#ifdef SK_DEBUG

void SkDraw::validate() const {
    SkASSERT(fBitmap != NULL);
    SkASSERT(fMatrix != NULL);
    SkASSERT(fClip != NULL);
    SkASSERT(fRC != NULL);

    const SkIRect&  cr = fRC->getBounds();
    SkIRect         br;

    br.set(0, 0, fBitmap->width(), fBitmap->height());
    SkASSERT(cr.isEmpty() || br.contains(cr));
}

#endif

////////////////////////////////////////////////////////////////////////////////////////////////

#include "SkPath.h"
#include "SkDraw.h"
#include "SkRegion.h"
#include "SkBlitter.h"

static bool compute_bounds(const SkPath& devPath, const SkIRect* clipBounds,
                       const SkMaskFilter* filter, const SkMatrix* filterMatrix,
                           SkIRect* bounds) {
    if (devPath.isEmpty()) {
        return false;
    }

    //  init our bounds from the path
    {
        SkRect pathBounds = devPath.getBounds();
        pathBounds.inset(-SK_ScalarHalf, -SK_ScalarHalf);
        pathBounds.roundOut(bounds);
    }

    SkIPoint margin = SkIPoint::Make(0, 0);
    if (filter) {
        SkASSERT(filterMatrix);

        SkMask srcM, dstM;

        srcM.fBounds = *bounds;
        srcM.fFormat = SkMask::kA8_Format;
        srcM.fImage = NULL;
        if (!filter->filterMask(&dstM, srcM, *filterMatrix, &margin)) {
            return false;
        }
    }

    // (possibly) trim the bounds to reflect the clip
    // (plus whatever slop the filter needs)
    if (clipBounds) {
        SkIRect tmp = *clipBounds;
        // Ugh. Guard against gigantic margins from wacky filters. Without this
        // check we can request arbitrary amounts of slop beyond our visible
        // clip, and bring down the renderer (at least on finite RAM machines
        // like handsets, etc.). Need to balance this invented value between
        // quality of large filters like blurs, and the corresponding memory
        // requests.
        static const int MAX_MARGIN = 128;
        tmp.inset(-SkMin32(margin.fX, MAX_MARGIN),
                  -SkMin32(margin.fY, MAX_MARGIN));
        if (!bounds->intersect(tmp)) {
            return false;
        }
    }

    return true;
}

static void draw_into_mask(const SkMask& mask, const SkPath& devPath,
                           SkPaint::Style style) {
    SkBitmap        bm;
    SkDraw          draw;
    SkRasterClip    clip;
    SkMatrix        matrix;
    SkPaint         paint;

    bm.installPixels(SkImageInfo::MakeA8(mask.fBounds.width(), mask.fBounds.height()),
                     mask.fImage, mask.fRowBytes);

    clip.setRect(SkIRect::MakeWH(mask.fBounds.width(), mask.fBounds.height()));
    matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft),
                        -SkIntToScalar(mask.fBounds.fTop));

    draw.fBitmap    = &bm;
    draw.fRC        = &clip;
    draw.fClip      = &clip.bwRgn();
    draw.fMatrix    = &matrix;
    paint.setAntiAlias(true);
    paint.setStyle(style);
    draw.drawPath(devPath, paint);
}

bool SkDraw::DrawToMask(const SkPath& devPath, const SkIRect* clipBounds,
                        const SkMaskFilter* filter, const SkMatrix* filterMatrix,
                        SkMask* mask, SkMask::CreateMode mode,
                        SkPaint::Style style) {
    if (SkMask::kJustRenderImage_CreateMode != mode) {
        if (!compute_bounds(devPath, clipBounds, filter, filterMatrix, &mask->fBounds))
            return false;
    }

    if (SkMask::kComputeBoundsAndRenderImage_CreateMode == mode) {
        mask->fFormat = SkMask::kA8_Format;
        mask->fRowBytes = mask->fBounds.width();
        size_t size = mask->computeImageSize();
        if (0 == size) {
            // we're too big to allocate the mask, abort
            return false;
        }
        mask->fImage = SkMask::AllocImage(size);
        memset(mask->fImage, 0, mask->computeImageSize());
    }

    if (SkMask::kJustComputeBounds_CreateMode != mode) {
        draw_into_mask(*mask, devPath, style);
    }

    return true;
}