/usr/share/gtk-doc/html/cairo/cairo-cairo-t.html is in libcairo2-doc 1.10.2-6.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>cairo_t</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
<link rel="home" href="index.html" title="Cairo: A Vector Graphics Library">
<link rel="up" href="cairo-drawing.html" title="Drawing">
<link rel="prev" href="cairo-drawing.html" title="Drawing">
<link rel="next" href="cairo-Paths.html" title="Paths">
<meta name="generator" content="GTK-Doc V1.15 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2">
<tr valign="middle">
<td><a accesskey="p" href="cairo-drawing.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
<td><a accesskey="u" href="cairo-drawing.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td>
<th width="100%" align="center">Cairo: A Vector Graphics Library</th>
<td><a accesskey="n" href="cairo-Paths.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
</tr>
<tr><td colspan="5" class="shortcuts">
<a href="#cairo-cairo-t.synopsis" class="shortcut">Top</a>
|
<a href="#cairo-cairo-t.description" class="shortcut">Description</a>
</td></tr>
</table>
<div class="refentry" title="cairo_t">
<a name="cairo-cairo-t"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cairo-cairo-t.top_of_page"></a>cairo_t</span></h2>
<p>cairo_t — The cairo drawing context</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="cairo-cairo-t.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">typedef <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t">cairo_t</a>;
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="returnvalue">cairo_t</span></a> * <a class="link" href="cairo-cairo-t.html#cairo-create" title="cairo_create ()">cairo_create</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *target</code></em>);
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="returnvalue">cairo_t</span></a> * <a class="link" href="cairo-cairo-t.html#cairo-reference" title="cairo_reference ()">cairo_reference</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-destroy" title="cairo_destroy ()">cairo_destroy</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-status" title="cairo_status ()">cairo_status</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()">cairo_save</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()">cairo_restore</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * <a class="link" href="cairo-cairo-t.html#cairo-get-target" title="cairo_get_target ()">cairo_get_target</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()">cairo_push_group</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-push-group-with-content" title="cairo_push_group_with_content ()">cairo_push_group_with_content</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a> content</code></em>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * <a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()">cairo_pop_group</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-pop-group-to-source" title="cairo_pop_group_to_source ()">cairo_pop_group_to_source</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * <a class="link" href="cairo-cairo-t.html#cairo-get-group-target" title="cairo_get_group_target ()">cairo_get_group_target</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-source-rgb" title="cairo_set_source_rgb ()">cairo_set_source_rgb</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> red</code></em>,
<em class="parameter"><code><span class="type">double</span> green</code></em>,
<em class="parameter"><code><span class="type">double</span> blue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-source-rgba" title="cairo_set_source_rgba ()">cairo_set_source_rgba</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> red</code></em>,
<em class="parameter"><code><span class="type">double</span> green</code></em>,
<em class="parameter"><code><span class="type">double</span> blue</code></em>,
<em class="parameter"><code><span class="type">double</span> alpha</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-source" title="cairo_set_source ()">cairo_set_source</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> *source</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-source-surface" title="cairo_set_source_surface ()">cairo_set_source_surface</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * <a class="link" href="cairo-cairo-t.html#cairo-get-source" title="cairo_get_source ()">cairo_get_source</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
enum <a class="link" href="cairo-cairo-t.html#cairo-antialias-t" title="enum cairo_antialias_t">cairo_antialias_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-antialias" title="cairo_set_antialias ()">cairo_set_antialias</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-antialias-t" title="enum cairo_antialias_t"><span class="type">cairo_antialias_t</span></a> antialias</code></em>);
<a class="link" href="cairo-cairo-t.html#cairo-antialias-t" title="enum cairo_antialias_t"><span class="returnvalue">cairo_antialias_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-get-antialias" title="cairo_get_antialias ()">cairo_get_antialias</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()">cairo_set_dash</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code>const <span class="type">double</span> *dashes</code></em>,
<em class="parameter"><code><span class="type">int</span> num_dashes</code></em>,
<em class="parameter"><code><span class="type">double</span> offset</code></em>);
<span class="returnvalue">int</span> <a class="link" href="cairo-cairo-t.html#cairo-get-dash-count" title="cairo_get_dash_count ()">cairo_get_dash_count</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-get-dash" title="cairo_get_dash ()">cairo_get_dash</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> *dashes</code></em>,
<em class="parameter"><code><span class="type">double</span> *offset</code></em>);
enum <a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t">cairo_fill_rule_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()">cairo_set_fill_rule</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t"><span class="type">cairo_fill_rule_t</span></a> fill_rule</code></em>);
<a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t"><span class="returnvalue">cairo_fill_rule_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-get-fill-rule" title="cairo_get_fill_rule ()">cairo_get_fill_rule</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
enum <a class="link" href="cairo-cairo-t.html#cairo-line-cap-t" title="enum cairo_line_cap_t">cairo_line_cap_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-line-cap" title="cairo_set_line_cap ()">cairo_set_line_cap</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-line-cap-t" title="enum cairo_line_cap_t"><span class="type">cairo_line_cap_t</span></a> line_cap</code></em>);
<a class="link" href="cairo-cairo-t.html#cairo-line-cap-t" title="enum cairo_line_cap_t"><span class="returnvalue">cairo_line_cap_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-get-line-cap" title="cairo_get_line_cap ()">cairo_get_line_cap</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
enum <a class="link" href="cairo-cairo-t.html#cairo-line-join-t" title="enum cairo_line_join_t">cairo_line_join_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-line-join" title="cairo_set_line_join ()">cairo_set_line_join</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-line-join-t" title="enum cairo_line_join_t"><span class="type">cairo_line_join_t</span></a> line_join</code></em>);
<a class="link" href="cairo-cairo-t.html#cairo-line-join-t" title="enum cairo_line_join_t"><span class="returnvalue">cairo_line_join_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-get-line-join" title="cairo_get_line_join ()">cairo_get_line_join</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()">cairo_set_line_width</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> width</code></em>);
<span class="returnvalue">double</span> <a class="link" href="cairo-cairo-t.html#cairo-get-line-width" title="cairo_get_line_width ()">cairo_get_line_width</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-miter-limit" title="cairo_set_miter_limit ()">cairo_set_miter_limit</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> limit</code></em>);
<span class="returnvalue">double</span> <a class="link" href="cairo-cairo-t.html#cairo-get-miter-limit" title="cairo_get_miter_limit ()">cairo_get_miter_limit</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
enum <a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t">cairo_operator_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-operator" title="cairo_set_operator ()">cairo_set_operator</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t"><span class="type">cairo_operator_t</span></a> op</code></em>);
<a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t"><span class="returnvalue">cairo_operator_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-get-operator" title="cairo_get_operator ()">cairo_get_operator</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-set-tolerance" title="cairo_set_tolerance ()">cairo_set_tolerance</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> tolerance</code></em>);
<span class="returnvalue">double</span> <a class="link" href="cairo-cairo-t.html#cairo-get-tolerance" title="cairo_get_tolerance ()">cairo_get_tolerance</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()">cairo_clip</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-clip-preserve" title="cairo_clip_preserve ()">cairo_clip_preserve</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-clip-extents" title="cairo_clip_extents ()">cairo_clip_extents</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> *x1</code></em>,
<em class="parameter"><code><span class="type">double</span> *y1</code></em>,
<em class="parameter"><code><span class="type">double</span> *x2</code></em>,
<em class="parameter"><code><span class="type">double</span> *y2</code></em>);
<a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-in-clip" title="cairo_in_clip ()">cairo_in_clip</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-reset-clip" title="cairo_reset_clip ()">cairo_reset_clip</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<a class="link" href="cairo-cairo-t.html#cairo-rectangle-t" title="cairo_rectangle_t">cairo_rectangle_t</a>;
<a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-t" title="cairo_rectangle_list_t">cairo_rectangle_list_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-destroy" title="cairo_rectangle_list_destroy ()">cairo_rectangle_list_destroy</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-t" title="cairo_rectangle_list_t"><span class="type">cairo_rectangle_list_t</span></a> *rectangle_list</code></em>);
<a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-t" title="cairo_rectangle_list_t"><span class="returnvalue">cairo_rectangle_list_t</span></a> * <a class="link" href="cairo-cairo-t.html#cairo-copy-clip-rectangle-list" title="cairo_copy_clip_rectangle_list ()">cairo_copy_clip_rectangle_list</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()">cairo_fill</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-fill-preserve" title="cairo_fill_preserve ()">cairo_fill_preserve</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-fill-extents" title="cairo_fill_extents ()">cairo_fill_extents</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> *x1</code></em>,
<em class="parameter"><code><span class="type">double</span> *y1</code></em>,
<em class="parameter"><code><span class="type">double</span> *x2</code></em>,
<em class="parameter"><code><span class="type">double</span> *y2</code></em>);
<a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-in-fill" title="cairo_in_fill ()">cairo_in_fill</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-mask" title="cairo_mask ()">cairo_mask</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> *pattern</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-mask-surface" title="cairo_mask_surface ()">cairo_mask_surface</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>,
<em class="parameter"><code><span class="type">double</span> surface_x</code></em>,
<em class="parameter"><code><span class="type">double</span> surface_y</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-paint" title="cairo_paint ()">cairo_paint</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-paint-with-alpha" title="cairo_paint_with_alpha ()">cairo_paint_with_alpha</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> alpha</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()">cairo_stroke</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-stroke-preserve" title="cairo_stroke_preserve ()">cairo_stroke_preserve</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-stroke-extents" title="cairo_stroke_extents ()">cairo_stroke_extents</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> *x1</code></em>,
<em class="parameter"><code><span class="type">double</span> *y1</code></em>,
<em class="parameter"><code><span class="type">double</span> *x2</code></em>,
<em class="parameter"><code><span class="type">double</span> *y2</code></em>);
<a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-in-stroke" title="cairo_in_stroke ()">cairo_in_stroke</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-copy-page" title="cairo_copy_page ()">cairo_copy_page</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-t.html#cairo-show-page" title="cairo_show_page ()">cairo_show_page</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
unsigned <span class="returnvalue">int</span> <a class="link" href="cairo-cairo-t.html#cairo-get-reference-count" title="cairo_get_reference_count ()">cairo_get_reference_count</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-t.html#cairo-set-user-data" title="cairo_set_user_data ()">cairo_set_user_data</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> *key</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
<em class="parameter"><code><a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> destroy</code></em>);
<span class="returnvalue">void</span> * <a class="link" href="cairo-cairo-t.html#cairo-get-user-data" title="cairo_get_user_data ()">cairo_get_user_data</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> *key</code></em>);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="cairo-cairo-t.description"></a><h2>Description</h2>
<p>
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> is the main object used when drawing with cairo. To
draw with cairo, you create a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>, set the target surface,
and drawing options for the <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>, create shapes with
functions like <a class="link" href="cairo-Paths.html#cairo-move-to" title="cairo_move_to ()"><code class="function">cairo_move_to()</code></a> and <a class="link" href="cairo-Paths.html#cairo-line-to" title="cairo_line_to ()"><code class="function">cairo_line_to()</code></a>, and then
draw shapes with <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a> or <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a>.
</p>
<p>
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>'s can be pushed to a stack via <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a>.
They may then safely be changed, without loosing the current state.
Use <a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a> to restore to the saved state.
</p>
</div>
<div class="refsect1" title="Details">
<a name="cairo-cairo-t.details"></a><h2>Details</h2>
<div class="refsect2" title="cairo_t">
<a name="cairo-t"></a><h3>cairo_t</h3>
<pre class="programlisting">typedef struct _cairo cairo_t;
</pre>
<p>
A <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> contains the current state of the rendering device,
including coordinates of yet to be drawn shapes.
</p>
<p>
Cairo contexts, as <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> objects are named, are central to
cairo and all drawing with cairo is always done to a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
object.
</p>
<p>
Memory management of <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> is done with
<a class="link" href="cairo-cairo-t.html#cairo-reference" title="cairo_reference ()"><code class="function">cairo_reference()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-destroy" title="cairo_destroy ()"><code class="function">cairo_destroy()</code></a>.
</p>
</div>
<hr>
<div class="refsect2" title="cairo_create ()">
<a name="cairo-create"></a><h3>cairo_create ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="returnvalue">cairo_t</span></a> * cairo_create (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *target</code></em>);</pre>
<p>
Creates a new <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> with all graphics state parameters set to
default values and with <em class="parameter"><code>target</code></em> as a target surface. The target
surface should be constructed with a backend-specific function such
as <a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-create" title="cairo_image_surface_create ()"><code class="function">cairo_image_surface_create()</code></a> (or any other
cairo_<span class="emphasis"><em>backend</em></span><code class="function">_surface_create()</code> variant).
</p>
<p>
This function references <em class="parameter"><code>target</code></em>, so you can immediately
call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> on it if you don't need to
maintain a separate reference to it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>target</code></em> :</span></p></td>
<td>target surface for the context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a newly allocated <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> with a reference
count of 1. The initial reference count should be released
with <a class="link" href="cairo-cairo-t.html#cairo-destroy" title="cairo_destroy ()"><code class="function">cairo_destroy()</code></a> when you are done using the <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>.
This function never returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. If memory cannot be
allocated, a special <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> object will be returned on
which <a class="link" href="cairo-cairo-t.html#cairo-status" title="cairo_status ()"><code class="function">cairo_status()</code></a> returns <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-NO-MEMORY:CAPS"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></a>.
You can use this object normally, but no drawing will
be done.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_reference ()">
<a name="cairo-reference"></a><h3>cairo_reference ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="returnvalue">cairo_t</span></a> * cairo_reference (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Increases the reference count on <em class="parameter"><code>cr</code></em> by one. This prevents
<em class="parameter"><code>cr</code></em> from being destroyed until a matching call to <a class="link" href="cairo-cairo-t.html#cairo-destroy" title="cairo_destroy ()"><code class="function">cairo_destroy()</code></a>
is made.
</p>
<p>
The number of references to a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> can be get using
<a class="link" href="cairo-cairo-t.html#cairo-get-reference-count" title="cairo_get_reference_count ()"><code class="function">cairo_get_reference_count()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the referenced <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_destroy ()">
<a name="cairo-destroy"></a><h3>cairo_destroy ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_destroy (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Decreases the reference count on <em class="parameter"><code>cr</code></em> by one. If the result
is zero, then <em class="parameter"><code>cr</code></em> and all associated resources are freed.
See <a class="link" href="cairo-cairo-t.html#cairo-reference" title="cairo_reference ()"><code class="function">cairo_reference()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_status ()">
<a name="cairo-status"></a><h3>cairo_status ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> cairo_status (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Checks whether an error has previously occurred for this context.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current status of this context, see <a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_save ()">
<a name="cairo-save"></a><h3>cairo_save ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_save (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Makes a copy of the current state of <em class="parameter"><code>cr</code></em> and saves it
on an internal stack of saved states for <em class="parameter"><code>cr</code></em>. When
<a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a> is called, <em class="parameter"><code>cr</code></em> will be restored to
the saved state. Multiple calls to <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a> and
<a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a> can be nested; each call to <a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a>
restores the state from the matching paired <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a>.
</p>
<p>
It isn't necessary to clear all saved states before
a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> is freed. If the reference count of a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
drops to zero in response to a call to <a class="link" href="cairo-cairo-t.html#cairo-destroy" title="cairo_destroy ()"><code class="function">cairo_destroy()</code></a>,
any saved states will be freed along with the <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_restore ()">
<a name="cairo-restore"></a><h3>cairo_restore ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_restore (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Restores <em class="parameter"><code>cr</code></em> to the state saved by a preceding call to
<a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a> and removes that state from the stack of
saved states.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_target ()">
<a name="cairo-get-target"></a><h3>cairo_get_target ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * cairo_get_target (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the target surface for the cairo context as passed to
<a class="link" href="cairo-cairo-t.html#cairo-create" title="cairo_create ()"><code class="function">cairo_create()</code></a>.
</p>
<p>
This function will always return a valid pointer, but the result
can be a "nil" surface if <em class="parameter"><code>cr</code></em> is already in an error state,
(ie. <a class="link" href="cairo-cairo-t.html#cairo-status" title="cairo_status ()"><code class="function">cairo_status()</code></a> <code class="literal">!=</code> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>).
A nil surface is indicated by <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a>
<code class="literal">!=</code> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the target surface. This object is owned by cairo. To
keep a reference to it, you must call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-reference" title="cairo_surface_reference ()"><code class="function">cairo_surface_reference()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_push_group ()">
<a name="cairo-push-group"></a><h3>cairo_push_group ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_push_group (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Temporarily redirects drawing to an intermediate surface known as a
group. The redirection lasts until the group is completed by a call
to <a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()"><code class="function">cairo_pop_group()</code></a> or <a class="link" href="cairo-cairo-t.html#cairo-pop-group-to-source" title="cairo_pop_group_to_source ()"><code class="function">cairo_pop_group_to_source()</code></a>. These calls
provide the result of any drawing to the group as a pattern,
(either as an explicit object, or set as the source pattern).
</p>
<p>
This group functionality can be convenient for performing
intermediate compositing. One common use of a group is to render
objects as opaque within the group, (so that they occlude each
other), and then blend the result with translucence onto the
destination.
</p>
<p>
Groups can be nested arbitrarily deep by making balanced calls to
<a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()"><code class="function">cairo_push_group()</code></a>/<a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()"><code class="function">cairo_pop_group()</code></a>. Each call pushes/pops the new
target group onto/from a stack.
</p>
<p>
The <a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()"><code class="function">cairo_push_group()</code></a> function calls <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a> so that any
changes to the graphics state will not be visible outside the
group, (the pop_group functions call <a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a>).
</p>
<p>
By default the intermediate group will have a content type of
<a class="link" href="cairo-cairo-surface-t.html#CAIRO-CONTENT-COLOR-ALPHA:CAPS"><code class="literal">CAIRO_CONTENT_COLOR_ALPHA</code></a>. Other content types can be chosen for
the group by using <a class="link" href="cairo-cairo-t.html#cairo-push-group-with-content" title="cairo_push_group_with_content ()"><code class="function">cairo_push_group_with_content()</code></a> instead.
</p>
<p>
As an example, here is how one might fill and stroke a path with
translucence, but without any portion of the fill being visible
under the stroke:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
cairo_push_group (cr);
cairo_set_source (cr, fill_pattern);
cairo_fill_preserve (cr);
cairo_set_source (cr, stroke_pattern);
cairo_stroke (cr);
cairo_pop_group_to_source (cr);
cairo_paint_with_alpha (cr, alpha);
</pre></div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2" title="cairo_push_group_with_content ()">
<a name="cairo-push-group-with-content"></a><h3>cairo_push_group_with_content ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_push_group_with_content (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a> content</code></em>);</pre>
<p>
Temporarily redirects drawing to an intermediate surface known as a
group. The redirection lasts until the group is completed by a call
to <a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()"><code class="function">cairo_pop_group()</code></a> or <a class="link" href="cairo-cairo-t.html#cairo-pop-group-to-source" title="cairo_pop_group_to_source ()"><code class="function">cairo_pop_group_to_source()</code></a>. These calls
provide the result of any drawing to the group as a pattern,
(either as an explicit object, or set as the source pattern).
</p>
<p>
The group will have a content type of <em class="parameter"><code>content</code></em>. The ability to
control this content type is the only distinction between this
function and <a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()"><code class="function">cairo_push_group()</code></a> which you should see for a more
detailed description of group rendering.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>content</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a> indicating the type of group that
will be created
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2" title="cairo_pop_group ()">
<a name="cairo-pop-group"></a><h3>cairo_pop_group ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * cairo_pop_group (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Terminates the redirection begun by a call to <a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()"><code class="function">cairo_push_group()</code></a> or
<a class="link" href="cairo-cairo-t.html#cairo-push-group-with-content" title="cairo_push_group_with_content ()"><code class="function">cairo_push_group_with_content()</code></a> and returns a new pattern
containing the results of all drawing operations performed to the
group.
</p>
<p>
The <a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()"><code class="function">cairo_pop_group()</code></a> function calls <a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a>, (balancing a
call to <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a> by the push_group function), so that any
changes to the graphics state will not be visible outside the
group.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a newly created (surface) pattern containing the
results of all drawing operations performed to the group. The
caller owns the returned object and should call
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-destroy" title="cairo_pattern_destroy ()"><code class="function">cairo_pattern_destroy()</code></a> when finished with it.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2" title="cairo_pop_group_to_source ()">
<a name="cairo-pop-group-to-source"></a><h3>cairo_pop_group_to_source ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_pop_group_to_source (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Terminates the redirection begun by a call to <a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()"><code class="function">cairo_push_group()</code></a> or
<a class="link" href="cairo-cairo-t.html#cairo-push-group-with-content" title="cairo_push_group_with_content ()"><code class="function">cairo_push_group_with_content()</code></a> and installs the resulting pattern
as the source pattern in the given cairo context.
</p>
<p>
The behavior of this function is equivalent to the sequence of
operations:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t">cairo_pattern_t</a> *group = cairo_pop_group (cr);
cairo_set_source (cr, group);
cairo_pattern_destroy (group);
</pre></div>
<p>
</p>
<p>
but is more convenient as their is no need for a variable to store
the short-lived pointer to the pattern.
</p>
<p>
The <a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()"><code class="function">cairo_pop_group()</code></a> function calls <a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a>, (balancing a
call to <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a> by the push_group function), so that any
changes to the graphics state will not be visible outside the
group.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2" title="cairo_get_group_target ()">
<a name="cairo-get-group-target"></a><h3>cairo_get_group_target ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * cairo_get_group_target (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current destination surface for the context. This is either
the original target surface as passed to <a class="link" href="cairo-cairo-t.html#cairo-create" title="cairo_create ()"><code class="function">cairo_create()</code></a> or the target
surface for the current group as started by the most recent call to
<a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()"><code class="function">cairo_push_group()</code></a> or <a class="link" href="cairo-cairo-t.html#cairo-push-group-with-content" title="cairo_push_group_with_content ()"><code class="function">cairo_push_group_with_content()</code></a>.
</p>
<p>
This function will always return a valid pointer, but the result
can be a "nil" surface if <em class="parameter"><code>cr</code></em> is already in an error state,
(ie. <a class="link" href="cairo-cairo-t.html#cairo-status" title="cairo_status ()"><code class="function">cairo_status()</code></a> <code class="literal">!=</code> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>).
A nil surface is indicated by <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a>
<code class="literal">!=</code> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the target surface. This object is owned by cairo. To
keep a reference to it, you must call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-reference" title="cairo_surface_reference ()"><code class="function">cairo_surface_reference()</code></a>.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2" title="cairo_set_source_rgb ()">
<a name="cairo-set-source-rgb"></a><h3>cairo_set_source_rgb ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_source_rgb (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> red</code></em>,
<em class="parameter"><code><span class="type">double</span> green</code></em>,
<em class="parameter"><code><span class="type">double</span> blue</code></em>);</pre>
<p>
Sets the source pattern within <em class="parameter"><code>cr</code></em> to an opaque color. This opaque
color will then be used for any subsequent drawing operation until
a new source pattern is set.
</p>
<p>
The color components are floating point numbers in the range 0 to
1. If the values passed in are outside that range, they will be
clamped.
</p>
<p>
The default source pattern is opaque black, (that is, it is
equivalent to cairo_set_source_rgb(cr, 0.0, 0.0, 0.0)).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>red component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>green component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>blue component of color
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_source_rgba ()">
<a name="cairo-set-source-rgba"></a><h3>cairo_set_source_rgba ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_source_rgba (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> red</code></em>,
<em class="parameter"><code><span class="type">double</span> green</code></em>,
<em class="parameter"><code><span class="type">double</span> blue</code></em>,
<em class="parameter"><code><span class="type">double</span> alpha</code></em>);</pre>
<p>
Sets the source pattern within <em class="parameter"><code>cr</code></em> to a translucent color. This
color will then be used for any subsequent drawing operation until
a new source pattern is set.
</p>
<p>
The color and alpha components are floating point numbers in the
range 0 to 1. If the values passed in are outside that range, they
will be clamped.
</p>
<p>
The default source pattern is opaque black, (that is, it is
equivalent to cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0)).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>red component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>green component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>blue component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha</code></em> :</span></p></td>
<td>alpha component of color
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_source ()">
<a name="cairo-set-source"></a><h3>cairo_set_source ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_source (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> *source</code></em>);</pre>
<p>
Sets the source pattern within <em class="parameter"><code>cr</code></em> to <em class="parameter"><code>source</code></em>. This pattern
will then be used for any subsequent drawing operation until a new
source pattern is set.
</p>
<p>
Note: The pattern's transformation matrix will be locked to the
user space in effect at the time of <a class="link" href="cairo-cairo-t.html#cairo-set-source" title="cairo_set_source ()"><code class="function">cairo_set_source()</code></a>. This means
that further modifications of the current transformation matrix
will not affect the source pattern. See <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-set-matrix" title="cairo_pattern_set_matrix ()"><code class="function">cairo_pattern_set_matrix()</code></a>.
</p>
<p>
The default source pattern is a solid pattern that is opaque black,
(that is, it is equivalent to cairo_set_source_rgb(cr, 0.0, 0.0,
0.0)).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>source</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> to be used as the source for
subsequent drawing operations.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_source_surface ()">
<a name="cairo-set-source-surface"></a><h3>cairo_set_source_surface ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_source_surface (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<p>
This is a convenience function for creating a pattern from <em class="parameter"><code>surface</code></em>
and setting it as the source in <em class="parameter"><code>cr</code></em> with <a class="link" href="cairo-cairo-t.html#cairo-set-source" title="cairo_set_source ()"><code class="function">cairo_set_source()</code></a>.
</p>
<p>
The <em class="parameter"><code>x</code></em> and <em class="parameter"><code>y</code></em> parameters give the user-space coordinate at which
the surface origin should appear. (The surface origin is its
upper-left corner before any transformation has been applied.) The
<em class="parameter"><code>x</code></em> and <em class="parameter"><code>y</code></em> parameters are negated and then set as translation values
in the pattern matrix.
</p>
<p>
Other than the initial translation pattern matrix, as described
above, all other pattern attributes, (such as its extend mode), are
set to the default values as in <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-for-surface" title="cairo_pattern_create_for_surface ()"><code class="function">cairo_pattern_create_for_surface()</code></a>.
The resulting pattern can be queried with <a class="link" href="cairo-cairo-t.html#cairo-get-source" title="cairo_get_source ()"><code class="function">cairo_get_source()</code></a> so
that these attributes can be modified if desired, (eg. to create a
repeating pattern with <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-set-extend" title="cairo_pattern_set_extend ()"><code class="function">cairo_pattern_set_extend()</code></a>).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a surface to be used to set the source pattern
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>User-space X coordinate for surface origin
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>User-space Y coordinate for surface origin
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_source ()">
<a name="cairo-get-source"></a><h3>cairo_get_source ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * cairo_get_source (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current source pattern for <em class="parameter"><code>cr</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current source pattern. This object is owned by
cairo. To keep a reference to it, you must call
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-reference" title="cairo_pattern_reference ()"><code class="function">cairo_pattern_reference()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum cairo_antialias_t">
<a name="cairo-antialias-t"></a><h3>enum cairo_antialias_t</h3>
<pre class="programlisting">typedef enum _cairo_antialias {
CAIRO_ANTIALIAS_DEFAULT,
CAIRO_ANTIALIAS_NONE,
CAIRO_ANTIALIAS_GRAY,
CAIRO_ANTIALIAS_SUBPIXEL
} cairo_antialias_t;
</pre>
<p>
Specifies the type of antialiasing to do when rendering text or shapes.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CAIRO-ANTIALIAS-DEFAULT:CAPS"></a><span class="term"><code class="literal">CAIRO_ANTIALIAS_DEFAULT</code></span></p></td>
<td>Use the default antialiasing for
the subsystem and target device
</td>
</tr>
<tr>
<td><p><a name="CAIRO-ANTIALIAS-NONE:CAPS"></a><span class="term"><code class="literal">CAIRO_ANTIALIAS_NONE</code></span></p></td>
<td>Use a bilevel alpha mask
</td>
</tr>
<tr>
<td><p><a name="CAIRO-ANTIALIAS-GRAY:CAPS"></a><span class="term"><code class="literal">CAIRO_ANTIALIAS_GRAY</code></span></p></td>
<td>Perform single-color antialiasing (using
shades of gray for black text on a white background, for example).
</td>
</tr>
<tr>
<td><p><a name="CAIRO-ANTIALIAS-SUBPIXEL:CAPS"></a><span class="term"><code class="literal">CAIRO_ANTIALIAS_SUBPIXEL</code></span></p></td>
<td>Perform antialiasing by taking
advantage of the order of subpixel elements on devices
such as LCD panels
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_antialias ()">
<a name="cairo-set-antialias"></a><h3>cairo_set_antialias ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_antialias (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-antialias-t" title="enum cairo_antialias_t"><span class="type">cairo_antialias_t</span></a> antialias</code></em>);</pre>
<p>
Set the antialiasing mode of the rasterizer used for drawing shapes.
This value is a hint, and a particular backend may or may not support
a particular value. At the current time, no backend supports
<a class="link" href="cairo-cairo-t.html#CAIRO-ANTIALIAS-SUBPIXEL:CAPS"><code class="literal">CAIRO_ANTIALIAS_SUBPIXEL</code></a> when drawing shapes.
</p>
<p>
Note that this option does not affect text rendering, instead see
<a class="link" href="cairo-cairo-font-options-t.html#cairo-font-options-set-antialias" title="cairo_font_options_set_antialias ()"><code class="function">cairo_font_options_set_antialias()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>antialias</code></em> :</span></p></td>
<td>the new antialiasing mode
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_antialias ()">
<a name="cairo-get-antialias"></a><h3>cairo_get_antialias ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-t.html#cairo-antialias-t" title="enum cairo_antialias_t"><span class="returnvalue">cairo_antialias_t</span></a> cairo_get_antialias (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current shape antialiasing mode, as set by <code class="function">cairo_set_shape_antialias()</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current shape antialiasing mode.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_dash ()">
<a name="cairo-set-dash"></a><h3>cairo_set_dash ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_dash (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code>const <span class="type">double</span> *dashes</code></em>,
<em class="parameter"><code><span class="type">int</span> num_dashes</code></em>,
<em class="parameter"><code><span class="type">double</span> offset</code></em>);</pre>
<p>
Sets the dash pattern to be used by <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>. A dash pattern
is specified by <em class="parameter"><code>dashes</code></em>, an array of positive values. Each value
provides the length of alternate "on" and "off" portions of the
stroke. The <em class="parameter"><code>offset</code></em> specifies an offset into the pattern at which
the stroke begins.
</p>
<p>
Each "on" segment will have caps applied as if the segment were a
separate sub-path. In particular, it is valid to use an "on" length
of 0.0 with <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-ROUND:CAPS"><code class="literal">CAIRO_LINE_CAP_ROUND</code></a> or <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-SQUARE:CAPS"><code class="literal">CAIRO_LINE_CAP_SQUARE</code></a> in order
to distributed dots or squares along a path.
</p>
<p>
Note: The length values are in user-space units as evaluated at the
time of stroking. This is not necessarily the same as the user
space at the time of <a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()"><code class="function">cairo_set_dash()</code></a>.
</p>
<p>
If <em class="parameter"><code>num_dashes</code></em> is 0 dashing is disabled.
</p>
<p>
If <em class="parameter"><code>num_dashes</code></em> is 1 a symmetric pattern is assumed with alternating
on and off portions of the size specified by the single value in
<em class="parameter"><code>dashes</code></em>.
</p>
<p>
If any value in <em class="parameter"><code>dashes</code></em> is negative, or if all values are 0, then
<em class="parameter"><code>cr</code></em> will be put into an error state with a status of
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-INVALID-DASH:CAPS"><code class="literal">CAIRO_STATUS_INVALID_DASH</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dashes</code></em> :</span></p></td>
<td>an array specifying alternate lengths of on and off stroke portions
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num_dashes</code></em> :</span></p></td>
<td>the length of the dashes array
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>an offset into the dash pattern at which the stroke should start
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_dash_count ()">
<a name="cairo-get-dash-count"></a><h3>cairo_get_dash_count ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> cairo_get_dash_count (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
This function returns the length of the dash array in <em class="parameter"><code>cr</code></em> (0 if dashing
is not currently in effect).
</p>
<p>
See also <a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()"><code class="function">cairo_set_dash()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-get-dash" title="cairo_get_dash ()"><code class="function">cairo_get_dash()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the length of the dash array, or 0 if no dash array set.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_get_dash ()">
<a name="cairo-get-dash"></a><h3>cairo_get_dash ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_get_dash (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> *dashes</code></em>,
<em class="parameter"><code><span class="type">double</span> *offset</code></em>);</pre>
<p>
Gets the current dash array. If not <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, <em class="parameter"><code>dashes</code></em> should be big
enough to hold at least the number of values returned by
<a class="link" href="cairo-cairo-t.html#cairo-get-dash-count" title="cairo_get_dash_count ()"><code class="function">cairo_get_dash_count()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dashes</code></em> :</span></p></td>
<td>return value for the dash array, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>return value for the current dash offset, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="enum cairo_fill_rule_t">
<a name="cairo-fill-rule-t"></a><h3>enum cairo_fill_rule_t</h3>
<pre class="programlisting">typedef enum _cairo_fill_rule {
CAIRO_FILL_RULE_WINDING,
CAIRO_FILL_RULE_EVEN_ODD
} cairo_fill_rule_t;
</pre>
<p>
<a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t"><span class="type">cairo_fill_rule_t</span></a> is used to select how paths are filled. For both
fill rules, whether or not a point is included in the fill is
determined by taking a ray from that point to infinity and looking
at intersections with the path. The ray can be in any direction,
as long as it doesn't pass through the end point of a segment
or have a tricky intersection such as intersecting tangent to the path.
(Note that filling is not actually implemented in this way. This
is just a description of the rule that is applied.)
</p>
<p>
The default fill rule is <a class="link" href="cairo-cairo-t.html#CAIRO-FILL-RULE-WINDING:CAPS"><code class="literal">CAIRO_FILL_RULE_WINDING</code></a>.
</p>
<p>
New entries may be added in future versions.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CAIRO-FILL-RULE-WINDING:CAPS"></a><span class="term"><code class="literal">CAIRO_FILL_RULE_WINDING</code></span></p></td>
<td>If the path crosses the ray from
left-to-right, counts +1. If the path crosses the ray
from right to left, counts -1. (Left and right are determined
from the perspective of looking along the ray from the starting
point.) If the total count is non-zero, the point will be filled.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-FILL-RULE-EVEN-ODD:CAPS"></a><span class="term"><code class="literal">CAIRO_FILL_RULE_EVEN_ODD</code></span></p></td>
<td>Counts the total number of
intersections, without regard to the orientation of the contour. If
the total number of intersections is odd, the point will be
filled.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_fill_rule ()">
<a name="cairo-set-fill-rule"></a><h3>cairo_set_fill_rule ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_fill_rule (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t"><span class="type">cairo_fill_rule_t</span></a> fill_rule</code></em>);</pre>
<p>
Set the current fill rule within the cairo context. The fill rule
is used to determine which regions are inside or outside a complex
(potentially self-intersecting) path. The current fill rule affects
both <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()"><code class="function">cairo_clip()</code></a>. See <a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t"><span class="type">cairo_fill_rule_t</span></a> for details
on the semantics of each available fill rule.
</p>
<p>
The default fill rule is <a class="link" href="cairo-cairo-t.html#CAIRO-FILL-RULE-WINDING:CAPS"><code class="literal">CAIRO_FILL_RULE_WINDING</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fill_rule</code></em> :</span></p></td>
<td>a fill rule, specified as a <a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t"><span class="type">cairo_fill_rule_t</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_fill_rule ()">
<a name="cairo-get-fill-rule"></a><h3>cairo_get_fill_rule ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t"><span class="returnvalue">cairo_fill_rule_t</span></a> cairo_get_fill_rule (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current fill rule, as set by <a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()"><code class="function">cairo_set_fill_rule()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current fill rule.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum cairo_line_cap_t">
<a name="cairo-line-cap-t"></a><h3>enum cairo_line_cap_t</h3>
<pre class="programlisting">typedef enum _cairo_line_cap {
CAIRO_LINE_CAP_BUTT,
CAIRO_LINE_CAP_ROUND,
CAIRO_LINE_CAP_SQUARE
} cairo_line_cap_t;
</pre>
<p>
Specifies how to render the endpoints of the path when stroking.
</p>
<p>
The default line cap style is <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-BUTT:CAPS"><code class="literal">CAIRO_LINE_CAP_BUTT</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CAIRO-LINE-CAP-BUTT:CAPS"></a><span class="term"><code class="literal">CAIRO_LINE_CAP_BUTT</code></span></p></td>
<td>start(stop) the line exactly at the start(end) point
</td>
</tr>
<tr>
<td><p><a name="CAIRO-LINE-CAP-ROUND:CAPS"></a><span class="term"><code class="literal">CAIRO_LINE_CAP_ROUND</code></span></p></td>
<td>use a round ending, the center of the circle is the end point
</td>
</tr>
<tr>
<td><p><a name="CAIRO-LINE-CAP-SQUARE:CAPS"></a><span class="term"><code class="literal">CAIRO_LINE_CAP_SQUARE</code></span></p></td>
<td>use squared ending, the center of the square is the end point
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_line_cap ()">
<a name="cairo-set-line-cap"></a><h3>cairo_set_line_cap ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_line_cap (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-line-cap-t" title="enum cairo_line_cap_t"><span class="type">cairo_line_cap_t</span></a> line_cap</code></em>);</pre>
<p>
Sets the current line cap style within the cairo context. See
<a class="link" href="cairo-cairo-t.html#cairo-line-cap-t" title="enum cairo_line_cap_t"><span class="type">cairo_line_cap_t</span></a> for details about how the available line cap
styles are drawn.
</p>
<p>
As with the other stroke parameters, the current line cap style is
examined by <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-stroke-extents" title="cairo_stroke_extents ()"><code class="function">cairo_stroke_extents()</code></a>, and
<code class="function">cairo_stroke_to_path()</code>, but does not have any effect during path
construction.
</p>
<p>
The default line cap style is <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-BUTT:CAPS"><code class="literal">CAIRO_LINE_CAP_BUTT</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>line_cap</code></em> :</span></p></td>
<td>a line cap style
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_line_cap ()">
<a name="cairo-get-line-cap"></a><h3>cairo_get_line_cap ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-t.html#cairo-line-cap-t" title="enum cairo_line_cap_t"><span class="returnvalue">cairo_line_cap_t</span></a> cairo_get_line_cap (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current line cap style, as set by <a class="link" href="cairo-cairo-t.html#cairo-set-line-cap" title="cairo_set_line_cap ()"><code class="function">cairo_set_line_cap()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current line cap style.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum cairo_line_join_t">
<a name="cairo-line-join-t"></a><h3>enum cairo_line_join_t</h3>
<pre class="programlisting">typedef enum _cairo_line_join {
CAIRO_LINE_JOIN_MITER,
CAIRO_LINE_JOIN_ROUND,
CAIRO_LINE_JOIN_BEVEL
} cairo_line_join_t;
</pre>
<p>
Specifies how to render the junction of two lines when stroking.
</p>
<p>
The default line join style is <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-JOIN-MITER:CAPS"><code class="literal">CAIRO_LINE_JOIN_MITER</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CAIRO-LINE-JOIN-MITER:CAPS"></a><span class="term"><code class="literal">CAIRO_LINE_JOIN_MITER</code></span></p></td>
<td>use a sharp (angled) corner, see
<a class="link" href="cairo-cairo-t.html#cairo-set-miter-limit" title="cairo_set_miter_limit ()"><code class="function">cairo_set_miter_limit()</code></a>
</td>
</tr>
<tr>
<td><p><a name="CAIRO-LINE-JOIN-ROUND:CAPS"></a><span class="term"><code class="literal">CAIRO_LINE_JOIN_ROUND</code></span></p></td>
<td>use a rounded join, the center of the circle is the
joint point
</td>
</tr>
<tr>
<td><p><a name="CAIRO-LINE-JOIN-BEVEL:CAPS"></a><span class="term"><code class="literal">CAIRO_LINE_JOIN_BEVEL</code></span></p></td>
<td>use a cut-off join, the join is cut off at half
the line width from the joint point
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_line_join ()">
<a name="cairo-set-line-join"></a><h3>cairo_set_line_join ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_line_join (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-line-join-t" title="enum cairo_line_join_t"><span class="type">cairo_line_join_t</span></a> line_join</code></em>);</pre>
<p>
Sets the current line join style within the cairo context. See
<a class="link" href="cairo-cairo-t.html#cairo-line-join-t" title="enum cairo_line_join_t"><span class="type">cairo_line_join_t</span></a> for details about how the available line join
styles are drawn.
</p>
<p>
As with the other stroke parameters, the current line join style is
examined by <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-stroke-extents" title="cairo_stroke_extents ()"><code class="function">cairo_stroke_extents()</code></a>, and
<code class="function">cairo_stroke_to_path()</code>, but does not have any effect during path
construction.
</p>
<p>
The default line join style is <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-JOIN-MITER:CAPS"><code class="literal">CAIRO_LINE_JOIN_MITER</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>line_join</code></em> :</span></p></td>
<td>a line join style
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_line_join ()">
<a name="cairo-get-line-join"></a><h3>cairo_get_line_join ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-t.html#cairo-line-join-t" title="enum cairo_line_join_t"><span class="returnvalue">cairo_line_join_t</span></a> cairo_get_line_join (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current line join style, as set by <a class="link" href="cairo-cairo-t.html#cairo-set-line-join" title="cairo_set_line_join ()"><code class="function">cairo_set_line_join()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current line join style.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_line_width ()">
<a name="cairo-set-line-width"></a><h3>cairo_set_line_width ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_line_width (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> width</code></em>);</pre>
<p>
Sets the current line width within the cairo context. The line
width value specifies the diameter of a pen that is circular in
user space, (though device-space pen may be an ellipse in general
due to scaling/shear/rotation of the CTM).
</p>
<p>
Note: When the description above refers to user space and CTM it
refers to the user space and CTM in effect at the time of the
stroking operation, not the user space and CTM in effect at the
time of the call to <a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a>. The simplest usage
makes both of these spaces identical. That is, if there is no
change to the CTM between a call to <a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a> and the
stroking operation, then one can just pass user-space values to
<a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a> and ignore this note.
</p>
<p>
As with the other stroke parameters, the current line width is
examined by <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-stroke-extents" title="cairo_stroke_extents ()"><code class="function">cairo_stroke_extents()</code></a>, and
<code class="function">cairo_stroke_to_path()</code>, but does not have any effect during path
construction.
</p>
<p>
The default line width value is 2.0.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>a line width
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_line_width ()">
<a name="cairo-get-line-width"></a><h3>cairo_get_line_width ()</h3>
<pre class="programlisting"><span class="returnvalue">double</span> cairo_get_line_width (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
This function returns the current line width value exactly as set by
<a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a>. Note that the value is unchanged even if
the CTM has changed between the calls to <a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a> and
<a class="link" href="cairo-cairo-t.html#cairo-get-line-width" title="cairo_get_line_width ()"><code class="function">cairo_get_line_width()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current line width.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_miter_limit ()">
<a name="cairo-set-miter-limit"></a><h3>cairo_set_miter_limit ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_miter_limit (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> limit</code></em>);</pre>
<p>
Sets the current miter limit within the cairo context.
</p>
<p>
If the current line join style is set to <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-JOIN-MITER:CAPS"><code class="literal">CAIRO_LINE_JOIN_MITER</code></a>
(see <a class="link" href="cairo-cairo-t.html#cairo-set-line-join" title="cairo_set_line_join ()"><code class="function">cairo_set_line_join()</code></a>), the miter limit is used to determine
whether the lines should be joined with a bevel instead of a miter.
Cairo divides the length of the miter by the line width.
If the result is greater than the miter limit, the style is
converted to a bevel.
</p>
<p>
As with the other stroke parameters, the current line miter limit is
examined by <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-stroke-extents" title="cairo_stroke_extents ()"><code class="function">cairo_stroke_extents()</code></a>, and
<code class="function">cairo_stroke_to_path()</code>, but does not have any effect during path
construction.
</p>
<p>
The default miter limit value is 10.0, which will convert joins
with interior angles less than 11 degrees to bevels instead of
miters. For reference, a miter limit of 2.0 makes the miter cutoff
at 60 degrees, and a miter limit of 1.414 makes the cutoff at 90
degrees.
</p>
<p>
A miter limit for a desired angle can be computed as: miter limit =
1/sin(angle/2)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>limit</code></em> :</span></p></td>
<td>miter limit to set
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_miter_limit ()">
<a name="cairo-get-miter-limit"></a><h3>cairo_get_miter_limit ()</h3>
<pre class="programlisting"><span class="returnvalue">double</span> cairo_get_miter_limit (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current miter limit, as set by <a class="link" href="cairo-cairo-t.html#cairo-set-miter-limit" title="cairo_set_miter_limit ()"><code class="function">cairo_set_miter_limit()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current miter limit.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum cairo_operator_t">
<a name="cairo-operator-t"></a><h3>enum cairo_operator_t</h3>
<pre class="programlisting">typedef enum _cairo_operator {
CAIRO_OPERATOR_CLEAR,
CAIRO_OPERATOR_SOURCE,
CAIRO_OPERATOR_OVER,
CAIRO_OPERATOR_IN,
CAIRO_OPERATOR_OUT,
CAIRO_OPERATOR_ATOP,
CAIRO_OPERATOR_DEST,
CAIRO_OPERATOR_DEST_OVER,
CAIRO_OPERATOR_DEST_IN,
CAIRO_OPERATOR_DEST_OUT,
CAIRO_OPERATOR_DEST_ATOP,
CAIRO_OPERATOR_XOR,
CAIRO_OPERATOR_ADD,
CAIRO_OPERATOR_SATURATE,
CAIRO_OPERATOR_MULTIPLY,
CAIRO_OPERATOR_SCREEN,
CAIRO_OPERATOR_OVERLAY,
CAIRO_OPERATOR_DARKEN,
CAIRO_OPERATOR_LIGHTEN,
CAIRO_OPERATOR_COLOR_DODGE,
CAIRO_OPERATOR_COLOR_BURN,
CAIRO_OPERATOR_HARD_LIGHT,
CAIRO_OPERATOR_SOFT_LIGHT,
CAIRO_OPERATOR_DIFFERENCE,
CAIRO_OPERATOR_EXCLUSION,
CAIRO_OPERATOR_HSL_HUE,
CAIRO_OPERATOR_HSL_SATURATION,
CAIRO_OPERATOR_HSL_COLOR,
CAIRO_OPERATOR_HSL_LUMINOSITY
} cairo_operator_t;
</pre>
<p>
<a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t"><span class="type">cairo_operator_t</span></a> is used to set the compositing operator for all cairo
drawing operations.
</p>
<p>
The default operator is <a class="link" href="cairo-cairo-t.html#CAIRO-OPERATOR-OVER:CAPS"><code class="literal">CAIRO_OPERATOR_OVER</code></a>.
</p>
<p>
The operators marked as <em class="firstterm">unbounded</em> modify their
destination even outside of the mask layer (that is, their effect is not
bound by the mask layer). However, their effect can still be limited by
way of clipping.
</p>
<p>
To keep things simple, the operator descriptions here
document the behavior for when both source and destination are either fully
transparent or fully opaque. The actual implementation works for
translucent layers too.
For a more detailed explanation of the effects of each operator, including
the mathematical definitions, see
<a class="ulink" href="http://cairographics.org/operators/" target="_top">http://cairographics.org/operators/</a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CAIRO-OPERATOR-CLEAR:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_CLEAR</code></span></p></td>
<td>clear destination layer (bounded)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-SOURCE:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_SOURCE</code></span></p></td>
<td>replace destination layer (bounded)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-OVER:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_OVER</code></span></p></td>
<td>draw source layer on top of destination layer
(bounded)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-IN:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_IN</code></span></p></td>
<td>draw source where there was destination content
(unbounded)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-OUT:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_OUT</code></span></p></td>
<td>draw source where there was no destination
content (unbounded)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-ATOP:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_ATOP</code></span></p></td>
<td>draw source on top of destination content and
only there
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-DEST:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_DEST</code></span></p></td>
<td>ignore the source
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-DEST-OVER:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_DEST_OVER</code></span></p></td>
<td>draw destination on top of source
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-DEST-IN:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_DEST_IN</code></span></p></td>
<td>leave destination only where there was
source content (unbounded)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-DEST-OUT:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_DEST_OUT</code></span></p></td>
<td>leave destination only where there was no
source content
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-DEST-ATOP:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_DEST_ATOP</code></span></p></td>
<td>leave destination on top of source content
and only there (unbounded)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-XOR:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_XOR</code></span></p></td>
<td>source and destination are shown where there is only
one of them
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-ADD:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_ADD</code></span></p></td>
<td>source and destination layers are accumulated
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-SATURATE:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_SATURATE</code></span></p></td>
<td>like over, but assuming source and dest are
disjoint geometries
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-MULTIPLY:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_MULTIPLY</code></span></p></td>
<td>source and destination layers are multiplied.
This causes the result to be at least as dark as the darker inputs.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-SCREEN:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_SCREEN</code></span></p></td>
<td>source and destination are complemented and
multiplied. This causes the result to be at least as light as the lighter
inputs.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-OVERLAY:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_OVERLAY</code></span></p></td>
<td>multiplies or screens, depending on the
lightness of the destination color.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-DARKEN:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_DARKEN</code></span></p></td>
<td>replaces the destination with the source if it
is darker, otherwise keeps the source.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-LIGHTEN:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_LIGHTEN</code></span></p></td>
<td>replaces the destination with the source if it
is lighter, otherwise keeps the source.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-COLOR-DODGE:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_COLOR_DODGE</code></span></p></td>
<td>brightens the destination color to reflect
the source color.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-COLOR-BURN:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_COLOR_BURN</code></span></p></td>
<td>darkens the destination color to reflect
the source color.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-HARD-LIGHT:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_HARD_LIGHT</code></span></p></td>
<td>Multiplies or screens, dependant on source
color.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-SOFT-LIGHT:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_SOFT_LIGHT</code></span></p></td>
<td>Darkens or lightens, dependant on source
color.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-DIFFERENCE:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_DIFFERENCE</code></span></p></td>
<td>Takes the difference of the source and
destination color.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-EXCLUSION:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_EXCLUSION</code></span></p></td>
<td>Produces an effect similar to difference, but
with lower contrast.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-HSL-HUE:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_HSL_HUE</code></span></p></td>
<td>Creates a color with the hue of the source
and the saturation and luminosity of the target.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-HSL-SATURATION:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_HSL_SATURATION</code></span></p></td>
<td>Creates a color with the saturation
of the source and the hue and luminosity of the target. Painting with
this mode onto a gray area prduces no change.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-HSL-COLOR:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_HSL_COLOR</code></span></p></td>
<td>Creates a color with the hue and saturation
of the source and the luminosity of the target. This preserves the gray
levels of the target and is useful for coloring monochrome images or
tinting color images.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-OPERATOR-HSL-LUMINOSITY:CAPS"></a><span class="term"><code class="literal">CAIRO_OPERATOR_HSL_LUMINOSITY</code></span></p></td>
<td>Creates a color with the luminosity of
the source and the hue and saturation of the target. This produces an
inverse effect to <em class="parameter"><code>CAIRO_OPERATOR_HSL_COLOR</code></em>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_operator ()">
<a name="cairo-set-operator"></a><h3>cairo_set_operator ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_operator (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t"><span class="type">cairo_operator_t</span></a> op</code></em>);</pre>
<p>
Sets the compositing operator to be used for all drawing
operations. See <a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t"><span class="type">cairo_operator_t</span></a> for details on the semantics of
each available compositing operator.
</p>
<p>
The default operator is <a class="link" href="cairo-cairo-t.html#CAIRO-OPERATOR-OVER:CAPS"><code class="literal">CAIRO_OPERATOR_OVER</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>op</code></em> :</span></p></td>
<td>a compositing operator, specified as a <a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t"><span class="type">cairo_operator_t</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_operator ()">
<a name="cairo-get-operator"></a><h3>cairo_get_operator ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t"><span class="returnvalue">cairo_operator_t</span></a> cairo_get_operator (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current compositing operator for a cairo context.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current compositing operator.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_set_tolerance ()">
<a name="cairo-set-tolerance"></a><h3>cairo_set_tolerance ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_set_tolerance (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> tolerance</code></em>);</pre>
<p>
Sets the tolerance used when converting paths into trapezoids.
Curved segments of the path will be subdivided until the maximum
deviation between the original path and the polygonal approximation
is less than <em class="parameter"><code>tolerance</code></em>. The default value is 0.1. A larger
value will give better performance, a smaller value, better
appearance. (Reducing the value from the default value of 0.1
is unlikely to improve appearance significantly.) The accuracy of paths
within Cairo is limited by the precision of its internal arithmetic, and
the prescribed <em class="parameter"><code>tolerance</code></em> is restricted to the smallest
representable internal value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tolerance</code></em> :</span></p></td>
<td>the tolerance, in device units (typically pixels)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_tolerance ()">
<a name="cairo-get-tolerance"></a><h3>cairo_get_tolerance ()</h3>
<pre class="programlisting"><span class="returnvalue">double</span> cairo_get_tolerance (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current tolerance value, as set by <a class="link" href="cairo-cairo-t.html#cairo-set-tolerance" title="cairo_set_tolerance ()"><code class="function">cairo_set_tolerance()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current tolerance value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_clip ()">
<a name="cairo-clip"></a><h3>cairo_clip ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_clip (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Establishes a new clip region by intersecting the current clip
region with the current path as it would be filled by <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a>
and according to the current fill rule (see <a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()"><code class="function">cairo_set_fill_rule()</code></a>).
</p>
<p>
After <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()"><code class="function">cairo_clip()</code></a>, the current path will be cleared from the cairo
context.
</p>
<p>
The current clip region affects all drawing operations by
effectively masking out any changes to the surface that are outside
the current clip region.
</p>
<p>
Calling <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()"><code class="function">cairo_clip()</code></a> can only make the clip region smaller, never
larger. But the current clip is part of the graphics state, so a
temporary restriction of the clip region can be achieved by
calling <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()"><code class="function">cairo_clip()</code></a> within a <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a>/<a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a>
pair. The only other means of increasing the size of the clip
region is <a class="link" href="cairo-cairo-t.html#cairo-reset-clip" title="cairo_reset_clip ()"><code class="function">cairo_reset_clip()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_clip_preserve ()">
<a name="cairo-clip-preserve"></a><h3>cairo_clip_preserve ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_clip_preserve (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Establishes a new clip region by intersecting the current clip
region with the current path as it would be filled by <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a>
and according to the current fill rule (see <a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()"><code class="function">cairo_set_fill_rule()</code></a>).
</p>
<p>
Unlike <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()"><code class="function">cairo_clip()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-clip-preserve" title="cairo_clip_preserve ()"><code class="function">cairo_clip_preserve()</code></a> preserves the path within
the cairo context.
</p>
<p>
The current clip region affects all drawing operations by
effectively masking out any changes to the surface that are outside
the current clip region.
</p>
<p>
Calling <a class="link" href="cairo-cairo-t.html#cairo-clip-preserve" title="cairo_clip_preserve ()"><code class="function">cairo_clip_preserve()</code></a> can only make the clip region smaller, never
larger. But the current clip is part of the graphics state, so a
temporary restriction of the clip region can be achieved by
calling <a class="link" href="cairo-cairo-t.html#cairo-clip-preserve" title="cairo_clip_preserve ()"><code class="function">cairo_clip_preserve()</code></a> within a <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a>/<a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a>
pair. The only other means of increasing the size of the clip
region is <a class="link" href="cairo-cairo-t.html#cairo-reset-clip" title="cairo_reset_clip ()"><code class="function">cairo_reset_clip()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_clip_extents ()">
<a name="cairo-clip-extents"></a><h3>cairo_clip_extents ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_clip_extents (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> *x1</code></em>,
<em class="parameter"><code><span class="type">double</span> *y1</code></em>,
<em class="parameter"><code><span class="type">double</span> *x2</code></em>,
<em class="parameter"><code><span class="type">double</span> *y2</code></em>);</pre>
<p>
Computes a bounding box in user coordinates covering the area inside the
current clip.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td>left of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td>top of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x2</code></em> :</span></p></td>
<td>right of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y2</code></em> :</span></p></td>
<td>bottom of the resulting extents
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_in_clip ()">
<a name="cairo-in-clip"></a><h3>cairo_in_clip ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a> cairo_in_clip (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<p>
Tests whether the given point is inside the area that would be
visible through the current clip, i.e. the area that would be filled by
a <a class="link" href="cairo-cairo-t.html#cairo-paint" title="cairo_paint ()"><code class="function">cairo_paint()</code></a> operation.
</p>
<p>
See <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()"><code class="function">cairo_clip()</code></a>, and <a class="link" href="cairo-cairo-t.html#cairo-clip-preserve" title="cairo_clip_preserve ()"><code class="function">cairo_clip_preserve()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>X coordinate of the point to test
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>Y coordinate of the point to test
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> A non-zero value if the point is inside, or zero if
outside.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
</div>
<hr>
<div class="refsect2" title="cairo_reset_clip ()">
<a name="cairo-reset-clip"></a><h3>cairo_reset_clip ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_reset_clip (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Reset the current clip region to its original, unrestricted
state. That is, set the clip region to an infinitely large shape
containing the target surface. Equivalently, if infinity is too
hard to grasp, one can imagine the clip region being reset to the
exact bounds of the target surface.
</p>
<p>
Note that code meant to be reusable should not call
<a class="link" href="cairo-cairo-t.html#cairo-reset-clip" title="cairo_reset_clip ()"><code class="function">cairo_reset_clip()</code></a> as it will cause results unexpected by
higher-level code which calls <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()"><code class="function">cairo_clip()</code></a>. Consider using
<a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()"><code class="function">cairo_restore()</code></a> around <a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()"><code class="function">cairo_clip()</code></a> as a more
robust means of temporarily restricting the clip region.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_rectangle_t">
<a name="cairo-rectangle-t"></a><h3>cairo_rectangle_t</h3>
<pre class="programlisting">typedef struct {
double x, y, width, height;
} cairo_rectangle_t;
</pre>
<p>
A data structure for holding a rectangle.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><span class="type">double</span> <em class="structfield"><code><a name="cairo-rectangle-t.x"></a>x</code></em>;</span></p></td>
<td>X coordinate of the left side of the rectangle
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">double</span> <em class="structfield"><code><a name="cairo-rectangle-t.y"></a>y</code></em>;</span></p></td>
<td>Y coordinate of the the top side of the rectangle
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">double</span> <em class="structfield"><code><a name="cairo-rectangle-t.width"></a>width</code></em>;</span></p></td>
<td>width of the rectangle
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">double</span> <em class="structfield"><code><a name="cairo-rectangle-t.height"></a>height</code></em>;</span></p></td>
<td>height of the rectangle
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_rectangle_list_t">
<a name="cairo-rectangle-list-t"></a><h3>cairo_rectangle_list_t</h3>
<pre class="programlisting">typedef struct {
cairo_status_t status;
cairo_rectangle_t *rectangles;
int num_rectangles;
} cairo_rectangle_list_t;
</pre>
<p>
A data structure for holding a dynamically allocated
array of rectangles.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a> <em class="structfield"><code><a name="cairo-rectangle-list-t.status"></a>status</code></em>;</span></p></td>
<td>Error status of the rectangle list
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="cairo-cairo-t.html#cairo-rectangle-t" title="cairo_rectangle_t"><span class="type">cairo_rectangle_t</span></a> *<em class="structfield"><code><a name="cairo-rectangle-list-t.rectangles"></a>rectangles</code></em>;</span></p></td>
<td>Array containing the rectangles
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="cairo-rectangle-list-t.num-rectangles"></a>num_rectangles</code></em>;</span></p></td>
<td>Number of rectangles in this list
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_rectangle_list_destroy ()">
<a name="cairo-rectangle-list-destroy"></a><h3>cairo_rectangle_list_destroy ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_rectangle_list_destroy (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-t" title="cairo_rectangle_list_t"><span class="type">cairo_rectangle_list_t</span></a> *rectangle_list</code></em>);</pre>
<p>
Unconditionally frees <em class="parameter"><code>rectangle_list</code></em> and all associated
references. After this call, the <em class="parameter"><code>rectangle_list</code></em> pointer must not
be dereferenced.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>rectangle_list</code></em> :</span></p></td>
<td>a rectangle list, as obtained from <code class="function">cairo_copy_clip_rectangles()</code>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_copy_clip_rectangle_list ()">
<a name="cairo-copy-clip-rectangle-list"></a><h3>cairo_copy_clip_rectangle_list ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-t" title="cairo_rectangle_list_t"><span class="returnvalue">cairo_rectangle_list_t</span></a> * cairo_copy_clip_rectangle_list (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Gets the current clip region as a list of rectangles in user coordinates.
Never returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</p>
<p>
The status in the list may be <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-CLIP-NOT-REPRESENTABLE:CAPS"><code class="literal">CAIRO_STATUS_CLIP_NOT_REPRESENTABLE</code></a> to
indicate that the clip region cannot be represented as a list of
user-space rectangles. The status may have other values to indicate
other errors.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current clip region as a list of rectangles in user coordinates,
which should be destroyed using <a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-destroy" title="cairo_rectangle_list_destroy ()"><code class="function">cairo_rectangle_list_destroy()</code></a>.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_fill ()">
<a name="cairo-fill"></a><h3>cairo_fill ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_fill (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
A drawing operator that fills the current path according to the
current fill rule, (each sub-path is implicitly closed before being
filled). After <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a>, the current path will be cleared from
the cairo context. See <a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()"><code class="function">cairo_set_fill_rule()</code></a> and
<a class="link" href="cairo-cairo-t.html#cairo-fill-preserve" title="cairo_fill_preserve ()"><code class="function">cairo_fill_preserve()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_fill_preserve ()">
<a name="cairo-fill-preserve"></a><h3>cairo_fill_preserve ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_fill_preserve (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
A drawing operator that fills the current path according to the
current fill rule, (each sub-path is implicitly closed before being
filled). Unlike <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-fill-preserve" title="cairo_fill_preserve ()"><code class="function">cairo_fill_preserve()</code></a> preserves the
path within the cairo context.
</p>
<p>
See <a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()"><code class="function">cairo_set_fill_rule()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_fill_extents ()">
<a name="cairo-fill-extents"></a><h3>cairo_fill_extents ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_fill_extents (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> *x1</code></em>,
<em class="parameter"><code><span class="type">double</span> *y1</code></em>,
<em class="parameter"><code><span class="type">double</span> *x2</code></em>,
<em class="parameter"><code><span class="type">double</span> *y2</code></em>);</pre>
<p>
Computes a bounding box in user coordinates covering the area that
would be affected, (the "inked" area), by a <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a> operation
given the current path and fill parameters. If the current path is
empty, returns an empty rectangle ((0,0), (0,0)). Surface
dimensions and clipping are not taken into account.
</p>
<p>
Contrast with <a class="link" href="cairo-Paths.html#cairo-path-extents" title="cairo_path_extents ()"><code class="function">cairo_path_extents()</code></a>, which is similar, but returns
non-zero extents for some paths with no inked area, (such as a
simple line segment).
</p>
<p>
Note that <a class="link" href="cairo-cairo-t.html#cairo-fill-extents" title="cairo_fill_extents ()"><code class="function">cairo_fill_extents()</code></a> must necessarily do more work to
compute the precise inked areas in light of the fill rule, so
<a class="link" href="cairo-Paths.html#cairo-path-extents" title="cairo_path_extents ()"><code class="function">cairo_path_extents()</code></a> may be more desirable for sake of performance
if the non-inked path extents are desired.
</p>
<p>
See <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()"><code class="function">cairo_set_fill_rule()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-fill-preserve" title="cairo_fill_preserve ()"><code class="function">cairo_fill_preserve()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td>left of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td>top of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x2</code></em> :</span></p></td>
<td>right of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y2</code></em> :</span></p></td>
<td>bottom of the resulting extents
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_in_fill ()">
<a name="cairo-in-fill"></a><h3>cairo_in_fill ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a> cairo_in_fill (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<p>
Tests whether the given point is inside the area that would be
affected by a <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a> operation given the current path and
filling parameters. Surface dimensions and clipping are not taken
into account.
</p>
<p>
See <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()"><code class="function">cairo_set_fill_rule()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-fill-preserve" title="cairo_fill_preserve ()"><code class="function">cairo_fill_preserve()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>X coordinate of the point to test
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>Y coordinate of the point to test
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> A non-zero value if the point is inside, or zero if
outside.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_mask ()">
<a name="cairo-mask"></a><h3>cairo_mask ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_mask (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> *pattern</code></em>);</pre>
<p>
A drawing operator that paints the current source
using the alpha channel of <em class="parameter"><code>pattern</code></em> as a mask. (Opaque
areas of <em class="parameter"><code>pattern</code></em> are painted with the source, transparent
areas are not painted.)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_mask_surface ()">
<a name="cairo-mask-surface"></a><h3>cairo_mask_surface ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_mask_surface (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>,
<em class="parameter"><code><span class="type">double</span> surface_x</code></em>,
<em class="parameter"><code><span class="type">double</span> surface_y</code></em>);</pre>
<p>
A drawing operator that paints the current source
using the alpha channel of <em class="parameter"><code>surface</code></em> as a mask. (Opaque
areas of <em class="parameter"><code>surface</code></em> are painted with the source, transparent
areas are not painted.)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface_x</code></em> :</span></p></td>
<td>X coordinate at which to place the origin of <em class="parameter"><code>surface</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface_y</code></em> :</span></p></td>
<td>Y coordinate at which to place the origin of <em class="parameter"><code>surface</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_paint ()">
<a name="cairo-paint"></a><h3>cairo_paint ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_paint (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
A drawing operator that paints the current source everywhere within
the current clip region.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_paint_with_alpha ()">
<a name="cairo-paint-with-alpha"></a><h3>cairo_paint_with_alpha ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_paint_with_alpha (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> alpha</code></em>);</pre>
<p>
A drawing operator that paints the current source everywhere within
the current clip region using a mask of constant alpha value
<em class="parameter"><code>alpha</code></em>. The effect is similar to <a class="link" href="cairo-cairo-t.html#cairo-paint" title="cairo_paint ()"><code class="function">cairo_paint()</code></a>, but the drawing
is faded out using the alpha value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha</code></em> :</span></p></td>
<td>alpha value, between 0 (transparent) and 1 (opaque)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_stroke ()">
<a name="cairo-stroke"></a><h3>cairo_stroke ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_stroke (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
A drawing operator that strokes the current path according to the
current line width, line join, line cap, and dash settings. After
<a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>, the current path will be cleared from the cairo
context. See <a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-line-join" title="cairo_set_line_join ()"><code class="function">cairo_set_line_join()</code></a>,
<a class="link" href="cairo-cairo-t.html#cairo-set-line-cap" title="cairo_set_line_cap ()"><code class="function">cairo_set_line_cap()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()"><code class="function">cairo_set_dash()</code></a>, and
<a class="link" href="cairo-cairo-t.html#cairo-stroke-preserve" title="cairo_stroke_preserve ()"><code class="function">cairo_stroke_preserve()</code></a>.
</p>
<p>
Note: Degenerate segments and sub-paths are treated specially and
provide a useful result. These can result in two different
situations:
</p>
<p>
1. Zero-length "on" segments set in <a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()"><code class="function">cairo_set_dash()</code></a>. If the cap
style is <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-ROUND:CAPS"><code class="literal">CAIRO_LINE_CAP_ROUND</code></a> or <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-SQUARE:CAPS"><code class="literal">CAIRO_LINE_CAP_SQUARE</code></a> then these
segments will be drawn as circular dots or squares respectively. In
the case of <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-SQUARE:CAPS"><code class="literal">CAIRO_LINE_CAP_SQUARE</code></a>, the orientation of the squares
is determined by the direction of the underlying path.
</p>
<p>
2. A sub-path created by <a class="link" href="cairo-Paths.html#cairo-move-to" title="cairo_move_to ()"><code class="function">cairo_move_to()</code></a> followed by either a
<a class="link" href="cairo-Paths.html#cairo-close-path" title="cairo_close_path ()"><code class="function">cairo_close_path()</code></a> or one or more calls to <a class="link" href="cairo-Paths.html#cairo-line-to" title="cairo_line_to ()"><code class="function">cairo_line_to()</code></a> to the
same coordinate as the <a class="link" href="cairo-Paths.html#cairo-move-to" title="cairo_move_to ()"><code class="function">cairo_move_to()</code></a>. If the cap style is
<a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-ROUND:CAPS"><code class="literal">CAIRO_LINE_CAP_ROUND</code></a> then these sub-paths will be drawn as circular
dots. Note that in the case of <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-SQUARE:CAPS"><code class="literal">CAIRO_LINE_CAP_SQUARE</code></a> a degenerate
sub-path will not be drawn at all, (since the correct orientation
is indeterminate).
</p>
<p>
In no case will a cap style of <a class="link" href="cairo-cairo-t.html#CAIRO-LINE-CAP-BUTT:CAPS"><code class="literal">CAIRO_LINE_CAP_BUTT</code></a> cause anything
to be drawn in the case of either degenerate segments or sub-paths.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_stroke_preserve ()">
<a name="cairo-stroke-preserve"></a><h3>cairo_stroke_preserve ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_stroke_preserve (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
A drawing operator that strokes the current path according to the
current line width, line join, line cap, and dash settings. Unlike
<a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-stroke-preserve" title="cairo_stroke_preserve ()"><code class="function">cairo_stroke_preserve()</code></a> preserves the path within the
cairo context.
</p>
<p>
See <a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-line-join" title="cairo_set_line_join ()"><code class="function">cairo_set_line_join()</code></a>,
<a class="link" href="cairo-cairo-t.html#cairo-set-line-cap" title="cairo_set_line_cap ()"><code class="function">cairo_set_line_cap()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()"><code class="function">cairo_set_dash()</code></a>, and
<a class="link" href="cairo-cairo-t.html#cairo-stroke-preserve" title="cairo_stroke_preserve ()"><code class="function">cairo_stroke_preserve()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_stroke_extents ()">
<a name="cairo-stroke-extents"></a><h3>cairo_stroke_extents ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_stroke_extents (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> *x1</code></em>,
<em class="parameter"><code><span class="type">double</span> *y1</code></em>,
<em class="parameter"><code><span class="type">double</span> *x2</code></em>,
<em class="parameter"><code><span class="type">double</span> *y2</code></em>);</pre>
<p>
Computes a bounding box in user coordinates covering the area that
would be affected, (the "inked" area), by a <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>
operation given the current path and stroke parameters.
If the current path is empty, returns an empty rectangle ((0,0), (0,0)).
Surface dimensions and clipping are not taken into account.
</p>
<p>
Note that if the line width is set to exactly zero, then
<a class="link" href="cairo-cairo-t.html#cairo-stroke-extents" title="cairo_stroke_extents ()"><code class="function">cairo_stroke_extents()</code></a> will return an empty rectangle. Contrast with
<a class="link" href="cairo-Paths.html#cairo-path-extents" title="cairo_path_extents ()"><code class="function">cairo_path_extents()</code></a> which can be used to compute the non-empty
bounds as the line width approaches zero.
</p>
<p>
Note that <a class="link" href="cairo-cairo-t.html#cairo-stroke-extents" title="cairo_stroke_extents ()"><code class="function">cairo_stroke_extents()</code></a> must necessarily do more work to
compute the precise inked areas in light of the stroke parameters,
so <a class="link" href="cairo-Paths.html#cairo-path-extents" title="cairo_path_extents ()"><code class="function">cairo_path_extents()</code></a> may be more desirable for sake of
performance if non-inked path extents are desired.
</p>
<p>
See <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-line-join" title="cairo_set_line_join ()"><code class="function">cairo_set_line_join()</code></a>,
<a class="link" href="cairo-cairo-t.html#cairo-set-line-cap" title="cairo_set_line_cap ()"><code class="function">cairo_set_line_cap()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()"><code class="function">cairo_set_dash()</code></a>, and
<a class="link" href="cairo-cairo-t.html#cairo-stroke-preserve" title="cairo_stroke_preserve ()"><code class="function">cairo_stroke_preserve()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td>left of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td>top of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x2</code></em> :</span></p></td>
<td>right of the resulting extents
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y2</code></em> :</span></p></td>
<td>bottom of the resulting extents
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_in_stroke ()">
<a name="cairo-in-stroke"></a><h3>cairo_in_stroke ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a> cairo_in_stroke (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<p>
Tests whether the given point is inside the area that would be
affected by a <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a> operation given the current path and
stroking parameters. Surface dimensions and clipping are not taken
into account.
</p>
<p>
See <a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()"><code class="function">cairo_stroke()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()"><code class="function">cairo_set_line_width()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-line-join" title="cairo_set_line_join ()"><code class="function">cairo_set_line_join()</code></a>,
<a class="link" href="cairo-cairo-t.html#cairo-set-line-cap" title="cairo_set_line_cap ()"><code class="function">cairo_set_line_cap()</code></a>, <a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()"><code class="function">cairo_set_dash()</code></a>, and
<a class="link" href="cairo-cairo-t.html#cairo-stroke-preserve" title="cairo_stroke_preserve ()"><code class="function">cairo_stroke_preserve()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>X coordinate of the point to test
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>Y coordinate of the point to test
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> A non-zero value if the point is inside, or zero if
outside.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_copy_page ()">
<a name="cairo-copy-page"></a><h3>cairo_copy_page ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_copy_page (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Emits the current page for backends that support multiple pages, but
doesn't clear it, so, the contents of the current page will be retained
for the next page too. Use <a class="link" href="cairo-cairo-t.html#cairo-show-page" title="cairo_show_page ()"><code class="function">cairo_show_page()</code></a> if you want to get an
empty page after the emission.
</p>
<p>
This is a convenience function that simply calls
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-copy-page" title="cairo_surface_copy_page ()"><code class="function">cairo_surface_copy_page()</code></a> on <em class="parameter"><code>cr</code></em>'s target.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_show_page ()">
<a name="cairo-show-page"></a><h3>cairo_show_page ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_show_page (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Emits and clears the current page for backends that support multiple
pages. Use <a class="link" href="cairo-cairo-t.html#cairo-copy-page" title="cairo_copy_page ()"><code class="function">cairo_copy_page()</code></a> if you don't want to clear the page.
</p>
<p>
This is a convenience function that simply calls
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-show-page" title="cairo_surface_show_page ()"><code class="function">cairo_surface_show_page()</code></a> on <em class="parameter"><code>cr</code></em>'s target.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a cairo context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_get_reference_count ()">
<a name="cairo-get-reference-count"></a><h3>cairo_get_reference_count ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span> cairo_get_reference_count (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>);</pre>
<p>
Returns the current reference count of <em class="parameter"><code>cr</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current reference count of <em class="parameter"><code>cr</code></em>. If the
object is a nil object, 0 will be returned.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_set_user_data ()">
<a name="cairo-set-user-data"></a><h3>cairo_set_user_data ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> cairo_set_user_data (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> *key</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
<em class="parameter"><code><a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> destroy</code></em>);</pre>
<p>
Attach user data to <em class="parameter"><code>cr</code></em>. To remove user data from a surface,
call this function with the key that was used to set it and <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
for <em class="parameter"><code>data</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the address of a <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> to attach the user data to
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the user data to attach to the <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> which will be called when the
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> is destroyed or when new user data is attached using the
same key.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a> or <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-NO-MEMORY:CAPS"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></a> if a
slot could not be allocated for the user data.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_get_user_data ()">
<a name="cairo-get-user-data"></a><h3>cairo_get_user_data ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> * cairo_get_user_data (<em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> *key</code></em>);</pre>
<p>
Return user data previously attached to <em class="parameter"><code>cr</code></em> using the specified
key. If no user data has been attached with the given key this
function returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the address of the <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> the user data was
attached to
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the user data previously attached or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
</div>
<div class="refsect1" title="See Also">
<a name="cairo-cairo-t.see-also"></a><h2>See Also</h2>
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a>
</div>
</div>
<div class="footer">
<hr>
Generated by GTK-Doc V1.15</div>
</body>
</html>
|