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
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
|
<!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: Cairo: A Vector Graphics Library</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<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 V1.27 (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="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span>
<a href="#cairo-cairo-t.description" class="shortcut">Description</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="cairo-drawing.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="cairo-drawing.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="cairo-Paths.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<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 class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cairo-cairo-t.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="returnvalue">cairo_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-create" title="cairo_create ()">cairo_create</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="returnvalue">cairo_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-reference" title="cairo_reference ()">cairo_reference</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-destroy" title="cairo_destroy ()">cairo_destroy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-status" title="cairo_status ()">cairo_status</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()">cairo_save</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-restore" title="cairo_restore ()">cairo_restore</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-target" title="cairo_get_target ()">cairo_get_target</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()">cairo_push_group</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()">cairo_pop_group</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-group-target" title="cairo_get_group_target ()">cairo_get_group_target</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-source-rgb" title="cairo_set_source_rgb ()">cairo_set_source_rgb</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-source-rgba" title="cairo_set_source_rgba ()">cairo_set_source_rgba</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-source" title="cairo_set_source ()">cairo_set_source</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-source-surface" title="cairo_set_source_surface ()">cairo_set_source_surface</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-source" title="cairo_get_source ()">cairo_get_source</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-antialias" title="cairo_set_antialias ()">cairo_set_antialias</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-t.html#cairo-antialias-t" title="enum cairo_antialias_t"><span class="returnvalue">cairo_antialias_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-antialias" title="cairo_get_antialias ()">cairo_get_antialias</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-dash" title="cairo_set_dash ()">cairo_set_dash</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-dash-count" title="cairo_get_dash_count ()">cairo_get_dash_count</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-dash" title="cairo_get_dash ()">cairo_get_dash</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-fill-rule" title="cairo_set_fill_rule ()">cairo_set_fill_rule</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<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>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-fill-rule" title="cairo_get_fill_rule ()">cairo_get_fill_rule</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-line-cap" title="cairo_set_line_cap ()">cairo_set_line_cap</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<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>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-line-cap" title="cairo_get_line_cap ()">cairo_get_line_cap</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-line-join" title="cairo_set_line_join ()">cairo_set_line_join</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<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>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-line-join" title="cairo_get_line_join ()">cairo_get_line_join</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-line-width" title="cairo_set_line_width ()">cairo_set_line_width</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">double</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-line-width" title="cairo_get_line_width ()">cairo_get_line_width</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-miter-limit" title="cairo_set_miter_limit ()">cairo_set_miter_limit</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">double</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-miter-limit" title="cairo_get_miter_limit ()">cairo_get_miter_limit</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-operator" title="cairo_set_operator ()">cairo_set_operator</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t"><span class="returnvalue">cairo_operator_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-operator" title="cairo_get_operator ()">cairo_get_operator</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-tolerance" title="cairo_set_tolerance ()">cairo_set_tolerance</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">double</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-tolerance" title="cairo_get_tolerance ()">cairo_get_tolerance</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-clip" title="cairo_clip ()">cairo_clip</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-clip-preserve" title="cairo_clip_preserve ()">cairo_clip_preserve</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-clip-extents" title="cairo_clip_extents ()">cairo_clip_extents</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-in-clip" title="cairo_in_clip ()">cairo_in_clip</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-reset-clip" title="cairo_reset_clip ()">cairo_reset_clip</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-destroy" title="cairo_rectangle_list_destroy ()">cairo_rectangle_list_destroy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<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> *
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()">cairo_fill</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-fill-preserve" title="cairo_fill_preserve ()">cairo_fill_preserve</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-fill-extents" title="cairo_fill_extents ()">cairo_fill_extents</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-in-fill" title="cairo_in_fill ()">cairo_in_fill</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-mask" title="cairo_mask ()">cairo_mask</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-mask-surface" title="cairo_mask_surface ()">cairo_mask_surface</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-paint" title="cairo_paint ()">cairo_paint</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-paint-with-alpha" title="cairo_paint_with_alpha ()">cairo_paint_with_alpha</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-stroke" title="cairo_stroke ()">cairo_stroke</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-stroke-preserve" title="cairo_stroke_preserve ()">cairo_stroke_preserve</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-stroke-extents" title="cairo_stroke_extents ()">cairo_stroke_extents</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-in-stroke" title="cairo_in_stroke ()">cairo_in_stroke</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-copy-page" title="cairo_copy_page ()">cairo_copy_page</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-show-page" title="cairo_show_page ()">cairo_show_page</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-reference-count" title="cairo_get_reference_count ()">cairo_get_reference_count</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-set-user-data" title="cairo_set_user_data ()">cairo_set_user_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-t.html#cairo-get-user-data" title="cairo_get_user_data ()">cairo_get_user_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-cairo-t.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t">cairo_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-cairo-t.html#cairo-antialias-t" title="enum cairo_antialias_t">cairo_antialias_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-cairo-t.html#cairo-fill-rule-t" title="enum cairo_fill_rule_t">cairo_fill_rule_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-cairo-t.html#cairo-line-cap-t" title="enum cairo_line_cap_t">cairo_line_cap_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-cairo-t.html#cairo-line-join-t" title="enum cairo_line_join_t">cairo_line_join_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-cairo-t.html#cairo-operator-t" title="enum cairo_operator_t">cairo_operator_t</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="cairo-cairo-t.html#cairo-rectangle-t" title="cairo_rectangle_t">cairo_rectangle_t</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="cairo-cairo-t.html#cairo-rectangle-list-t" title="cairo_rectangle_list_t">cairo_rectangle_list_t</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<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 losing 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">
<a name="cairo-cairo-t.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<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
<code class="function">cairo_<span class="emphasis"><em>backend</em></span>_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="refsect3">
<a name="cairo-create.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>target</p></td>
<td class="parameter_description"><p>target surface for the context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-create.returns"></a><h4>Returns</h4>
<p> 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="/usr/share/gtk-doc/html/glib/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>. If
you attempt to target a surface which does not support
writing (such as <span class="type">cairo_mime_surface_t</span>) then a
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-WRITE-ERROR:CAPS"><code class="literal">CAIRO_STATUS_WRITE_ERROR</code></a> will be raised. You can use this
object normally, but no drawing will be done.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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>Use <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> to get 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>.</p>
<div class="refsect3">
<a name="cairo-reference.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-reference.returns"></a><h4>Returns</h4>
<p> the referenced <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-destroy.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-status.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-status.returns"></a><h4>Returns</h4>
<p> 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></p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-save.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-restore.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-target.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-target.returns"></a><h4>Returns</h4>
<p> 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>.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="cairo-cairo-t.html#cairo-push-group">cairo_push_group</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">);</span>
<span class="function"><a href="cairo-cairo-t.html#cairo-set-source">cairo_set_source</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> fill_pattern<span class="gtkdoc opt">);</span>
<span class="function"><a href="cairo-cairo-t.html#cairo-fill-preserve">cairo_fill_preserve</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">);</span>
<span class="function"><a href="cairo-cairo-t.html#cairo-set-source">cairo_set_source</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> stroke_pattern<span class="gtkdoc opt">);</span>
<span class="function"><a href="cairo-cairo-t.html#cairo-stroke">cairo_stroke</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">);</span>
<span class="function"><a href="cairo-cairo-t.html#cairo-pop-group-to-source">cairo_pop_group_to_source</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">);</span>
<span class="function"><a href="cairo-cairo-t.html#cairo-paint-with-alpha">cairo_paint_with_alpha</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> alpha<span class="gtkdoc opt">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<div class="refsect3">
<a name="cairo-push-group.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-push-group-with-content.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>content</p></td>
<td class="parameter_description"><p>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</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-pop-group.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-pop-group.returns"></a><h4>Returns</h4>
<p> 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.</p>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<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>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting">cairo_pattern_t <span class="gtkdoc opt">*</span>group <span class="gtkdoc opt">=</span> <span class="function"><a href="cairo-cairo-t.html#cairo-pop-group">cairo_pop_group</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">);</span>
<span class="function"><a href="cairo-cairo-t.html#cairo-set-source">cairo_set_source</a></span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> group<span class="gtkdoc opt">);</span>
<span class="function"><a href="cairo-cairo-pattern-t.html#cairo-pattern-destroy">cairo_pattern_destroy</a></span> <span class="gtkdoc opt">(</span>group<span class="gtkdoc opt">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<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="refsect3">
<a name="cairo-pop-group-to-source.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-group-target.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-group-target.returns"></a><h4>Returns</h4>
<p> 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>.</p>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<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</p>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>If the values passed in are outside that range, they will be
clamped.</p></li></ol></div>
<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="refsect3">
<a name="cairo-set-source-rgb.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>red</p></td>
<td class="parameter_description"><p>red component of color</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>green</p></td>
<td class="parameter_description"><p>green component of color</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>blue</p></td>
<td class="parameter_description"><p>blue component of color</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-source-rgba.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>red</p></td>
<td class="parameter_description"><p>red component of color</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>green</p></td>
<td class="parameter_description"><p>green component of color</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>blue</p></td>
<td class="parameter_description"><p>blue component of color</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>alpha</p></td>
<td class="parameter_description"><p>alpha component of color</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-source.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>source</p></td>
<td class="parameter_description"><p>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.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-source-surface.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>surface</p></td>
<td class="parameter_description"><p>a surface to be used to set the source pattern</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>User-space X coordinate for surface origin</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>User-space Y coordinate for surface origin</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-source.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-source.returns"></a><h4>Returns</h4>
<p> 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>.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-antialias.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>antialias</p></td>
<td class="parameter_description"><p>the new antialiasing mode</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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
<a class="link" href="cairo-cairo-t.html#cairo-set-antialias" title="cairo_set_antialias ()"><code class="function">cairo_set_antialias()</code></a>.</p>
<div class="refsect3">
<a name="cairo-get-antialias.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-antialias.returns"></a><h4>Returns</h4>
<p> the current shape antialiasing mode.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-dash.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>dashes</p></td>
<td class="parameter_description"><p>an array specifying alternate lengths of on and off stroke portions</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>num_dashes</p></td>
<td class="parameter_description"><p>the length of the dashes array</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>an offset into the dash pattern at which the stroke should start</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-dash-count.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-dash-count.returns"></a><h4>Returns</h4>
<p> the length of the dash array, or 0 if no dash array set.</p>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<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="/usr/share/gtk-doc/html/glib/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="refsect3">
<a name="cairo-get-dash.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>dashes</p></td>
<td class="parameter_description"><p>return value for the dash array, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>return value for the current dash offset, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-fill-rule.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>fill_rule</p></td>
<td class="parameter_description"><p>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></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-fill-rule.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-fill-rule.returns"></a><h4>Returns</h4>
<p> the current fill rule.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-line-cap.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>line_cap</p></td>
<td class="parameter_description"><p>a line cap style</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-line-cap.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-line-cap.returns"></a><h4>Returns</h4>
<p> the current line cap style.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-line-join.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>line_join</p></td>
<td class="parameter_description"><p>a line join style</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-line-join.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-line-join.returns"></a><h4>Returns</h4>
<p> the current line join style.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-line-width.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>a line width</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-line-width.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-line-width.returns"></a><h4>Returns</h4>
<p> the current line width.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-miter-limit.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>limit</p></td>
<td class="parameter_description"><p>miter limit to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-miter-limit.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-miter-limit.returns"></a><h4>Returns</h4>
<p> the current miter limit.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-operator.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>op</p></td>
<td class="parameter_description"><p>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></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-operator.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-operator.returns"></a><h4>Returns</h4>
<p> the current compositing operator.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-set-tolerance.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tolerance</p></td>
<td class="parameter_description"><p>the tolerance, in device units (typically pixels)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-tolerance.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-tolerance.returns"></a><h4>Returns</h4>
<p> the current tolerance value.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-clip.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-clip-preserve.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-clip-extents.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x1</p></td>
<td class="parameter_description"><p>left of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y1</p></td>
<td class="parameter_description"><p>top of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x2</p></td>
<td class="parameter_description"><p>right of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y2</p></td>
<td class="parameter_description"><p>bottom of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-in-clip.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>X coordinate of the point to test</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>Y coordinate of the point to test</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-in-clip.returns"></a><h4>Returns</h4>
<p> A non-zero value if the point is inside, or zero if
outside.</p>
</div>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-reset-clip.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-rectangle-list-destroy.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>rectangle_list</p></td>
<td class="parameter_description"><p>a rectangle list, as obtained from <a class="link" href="cairo-cairo-t.html#cairo-copy-clip-rectangle-list" title="cairo_copy_clip_rectangle_list ()"><code class="function">cairo_copy_clip_rectangle_list()</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<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="/usr/share/gtk-doc/html/glib/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="refsect3">
<a name="cairo-copy-clip-rectangle-list.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-copy-clip-rectangle-list.returns"></a><h4>Returns</h4>
<p> 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>.</p>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-fill.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-fill-preserve.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-fill-extents.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x1</p></td>
<td class="parameter_description"><p>left of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y1</p></td>
<td class="parameter_description"><p>top of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x2</p></td>
<td class="parameter_description"><p>right of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y2</p></td>
<td class="parameter_description"><p>bottom of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-in-fill.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>X coordinate of the point to test</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>Y coordinate of the point to test</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-in-fill.returns"></a><h4>Returns</h4>
<p> A non-zero value if the point is inside, or zero if
outside.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-mask.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pattern</p></td>
<td class="parameter_description"><p>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></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-mask-surface.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>surface</p></td>
<td class="parameter_description"><p>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></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>surface_x</p></td>
<td class="parameter_description"><p>X coordinate at which to place the origin of <em class="parameter"><code>surface</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>surface_y</p></td>
<td class="parameter_description"><p>Y coordinate at which to place the origin of <em class="parameter"><code>surface</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-paint.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-paint-with-alpha.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>alpha</p></td>
<td class="parameter_description"><p>alpha value, between 0 (transparent) and 1 (opaque)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p>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></li>
<li class="listitem"><p>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></li>
</ol></div>
<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="refsect3">
<a name="cairo-stroke.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-stroke-preserve.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-stroke-extents.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x1</p></td>
<td class="parameter_description"><p>left of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y1</p></td>
<td class="parameter_description"><p>top of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x2</p></td>
<td class="parameter_description"><p>right of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y2</p></td>
<td class="parameter_description"><p>bottom of the resulting extents</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-in-stroke.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>X coordinate of the point to test</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>Y coordinate of the point to test</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-in-stroke.returns"></a><h4>Returns</h4>
<p> A non-zero value if the point is inside, or zero if
outside.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-copy-page.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-show-page.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a cairo context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-get-reference-count.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-reference-count.returns"></a><h4>Returns</h4>
<p> the current reference count of <em class="parameter"><code>cr</code></em>
. If the
object is a nil object, 0 will be returned.</p>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<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="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
for <em class="parameter"><code>data</code></em>
.</p>
<div class="refsect3">
<a name="cairo-set-user-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>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</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>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></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>destroy</p></td>
<td class="parameter_description"><p>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.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-set-user-data.returns"></a><h4>Returns</h4>
<p> <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.</p>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<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="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<div class="refsect3">
<a name="cairo-get-user-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>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</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-get-user-data.returns"></a><h4>Returns</h4>
<p> the user data previously attached or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
</div>
<p class="since">Since: 1.4</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-cairo-t.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<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>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-antialias-t"></a><h3>enum cairo_antialias_t</h3>
<p>Specifies the type of antialiasing to do when rendering text or shapes.</p>
<p>As it is not necessarily clear from the above what advantages a particular
antialias method provides, since 1.12, there is also a set of hints:
<em class="parameter"><code>CAIRO_ANTIALIAS_FAST</code></em>
: Allow the backend to degrade raster quality for speed
<em class="parameter"><code>CAIRO_ANTIALIAS_GOOD</code></em>
: A balance between speed and quality
<em class="parameter"><code>CAIRO_ANTIALIAS_BEST</code></em>
: A high-fidelity, but potentially slow, raster mode</p>
<p>These make no guarantee on how the backend will perform its rasterisation
(if it even rasterises!), nor that they have any differing effect other
than to enable some form of antialiasing. In the case of glyph rendering,
<em class="parameter"><code>CAIRO_ANTIALIAS_FAST</code></em>
and <em class="parameter"><code>CAIRO_ANTIALIAS_GOOD</code></em>
will be mapped to
<em class="parameter"><code>CAIRO_ANTIALIAS_GRAY</code></em>
, with <em class="parameter"><code>CAIRO_ANTALIAS_BEST</code></em>
being equivalent to
<em class="parameter"><code>CAIRO_ANTIALIAS_SUBPIXEL</code></em>
.</p>
<p>The interpretation of <em class="parameter"><code>CAIRO_ANTIALIAS_DEFAULT</code></em>
is left entirely up to
the backend, typically this will be similar to <em class="parameter"><code>CAIRO_ANTIALIAS_GOOD</code></em>
.</p>
<div class="refsect3">
<a name="cairo-antialias-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-ANTIALIAS-DEFAULT:CAPS"></a>CAIRO_ANTIALIAS_DEFAULT</p></td>
<td class="enum_member_description">
<p>Use the default antialiasing for
the subsystem and target device, since 1.0</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-ANTIALIAS-NONE:CAPS"></a>CAIRO_ANTIALIAS_NONE</p></td>
<td class="enum_member_description">
<p>Use a bilevel alpha mask, since 1.0</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-ANTIALIAS-GRAY:CAPS"></a>CAIRO_ANTIALIAS_GRAY</p></td>
<td class="enum_member_description">
<p>Perform single-color antialiasing (using
shades of gray for black text on a white background, for example), since 1.0</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-ANTIALIAS-SUBPIXEL:CAPS"></a>CAIRO_ANTIALIAS_SUBPIXEL</p></td>
<td class="enum_member_description">
<p>Perform antialiasing by taking
advantage of the order of subpixel elements on devices
such as LCD panels, since 1.0</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-ANTIALIAS-FAST:CAPS"></a>CAIRO_ANTIALIAS_FAST</p></td>
<td class="enum_member_description">
<p>Hint that the backend should perform some
antialiasing but prefer speed over quality, since 1.12</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-ANTIALIAS-GOOD:CAPS"></a>CAIRO_ANTIALIAS_GOOD</p></td>
<td class="enum_member_description">
<p>The backend should balance quality against
performance, since 1.12</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-ANTIALIAS-BEST:CAPS"></a>CAIRO_ANTIALIAS_BEST</p></td>
<td class="enum_member_description">
<p>Hint that the backend should render at the highest
quality, sacrificing speed if necessary, since 1.12</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-fill-rule-t"></a><h3>enum cairo_fill_rule_t</h3>
<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="refsect3">
<a name="cairo-fill-rule-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FILL-RULE-WINDING:CAPS"></a>CAIRO_FILL_RULE_WINDING</p></td>
<td class="enum_member_description">
<p>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. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FILL-RULE-EVEN-ODD:CAPS"></a>CAIRO_FILL_RULE_EVEN_ODD</p></td>
<td class="enum_member_description">
<p>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. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-line-cap-t"></a><h3>enum cairo_line_cap_t</h3>
<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="refsect3">
<a name="cairo-line-cap-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-LINE-CAP-BUTT:CAPS"></a>CAIRO_LINE_CAP_BUTT</p></td>
<td class="enum_member_description">
<p>start(stop) the line exactly at the start(end) point (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-LINE-CAP-ROUND:CAPS"></a>CAIRO_LINE_CAP_ROUND</p></td>
<td class="enum_member_description">
<p>use a round ending, the center of the circle is the end point (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-LINE-CAP-SQUARE:CAPS"></a>CAIRO_LINE_CAP_SQUARE</p></td>
<td class="enum_member_description">
<p>use squared ending, the center of the square is the end point (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-line-join-t"></a><h3>enum cairo_line_join_t</h3>
<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="refsect3">
<a name="cairo-line-join-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-LINE-JOIN-MITER:CAPS"></a>CAIRO_LINE_JOIN_MITER</p></td>
<td class="enum_member_description">
<p>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> (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-LINE-JOIN-ROUND:CAPS"></a>CAIRO_LINE_JOIN_ROUND</p></td>
<td class="enum_member_description">
<p>use a rounded join, the center of the circle is the
joint point (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-LINE-JOIN-BEVEL:CAPS"></a>CAIRO_LINE_JOIN_BEVEL</p></td>
<td class="enum_member_description">
<p>use a cut-off join, the join is cut off at half
the line width from the joint point (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-operator-t"></a><h3>enum cairo_operator_t</h3>
<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</p>
<a class="ulink" href="https://cairographics.org/operators/" target="_top">https://cairographics.org/operators/</a>.
<div class="refsect3">
<a name="cairo-operator-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-CLEAR:CAPS"></a>CAIRO_OPERATOR_CLEAR</p></td>
<td class="enum_member_description">
<p>clear destination layer (bounded) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-SOURCE:CAPS"></a>CAIRO_OPERATOR_SOURCE</p></td>
<td class="enum_member_description">
<p>replace destination layer (bounded) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-OVER:CAPS"></a>CAIRO_OPERATOR_OVER</p></td>
<td class="enum_member_description">
<p>draw source layer on top of destination layer
(bounded) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-IN:CAPS"></a>CAIRO_OPERATOR_IN</p></td>
<td class="enum_member_description">
<p>draw source where there was destination content
(unbounded) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-OUT:CAPS"></a>CAIRO_OPERATOR_OUT</p></td>
<td class="enum_member_description">
<p>draw source where there was no destination
content (unbounded) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-ATOP:CAPS"></a>CAIRO_OPERATOR_ATOP</p></td>
<td class="enum_member_description">
<p>draw source on top of destination content and
only there (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-DEST:CAPS"></a>CAIRO_OPERATOR_DEST</p></td>
<td class="enum_member_description">
<p>ignore the source (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-DEST-OVER:CAPS"></a>CAIRO_OPERATOR_DEST_OVER</p></td>
<td class="enum_member_description">
<p>draw destination on top of source (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-DEST-IN:CAPS"></a>CAIRO_OPERATOR_DEST_IN</p></td>
<td class="enum_member_description">
<p>leave destination only where there was
source content (unbounded) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-DEST-OUT:CAPS"></a>CAIRO_OPERATOR_DEST_OUT</p></td>
<td class="enum_member_description">
<p>leave destination only where there was no
source content (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-DEST-ATOP:CAPS"></a>CAIRO_OPERATOR_DEST_ATOP</p></td>
<td class="enum_member_description">
<p>leave destination on top of source content
and only there (unbounded) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-XOR:CAPS"></a>CAIRO_OPERATOR_XOR</p></td>
<td class="enum_member_description">
<p>source and destination are shown where there is only
one of them (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-ADD:CAPS"></a>CAIRO_OPERATOR_ADD</p></td>
<td class="enum_member_description">
<p>source and destination layers are accumulated (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-SATURATE:CAPS"></a>CAIRO_OPERATOR_SATURATE</p></td>
<td class="enum_member_description">
<p>like over, but assuming source and dest are
disjoint geometries (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-MULTIPLY:CAPS"></a>CAIRO_OPERATOR_MULTIPLY</p></td>
<td class="enum_member_description">
<p>source and destination layers are multiplied.
This causes the result to be at least as dark as the darker inputs. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-SCREEN:CAPS"></a>CAIRO_OPERATOR_SCREEN</p></td>
<td class="enum_member_description">
<p>source and destination are complemented and
multiplied. This causes the result to be at least as light as the lighter
inputs. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-OVERLAY:CAPS"></a>CAIRO_OPERATOR_OVERLAY</p></td>
<td class="enum_member_description">
<p>multiplies or screens, depending on the
lightness of the destination color. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-DARKEN:CAPS"></a>CAIRO_OPERATOR_DARKEN</p></td>
<td class="enum_member_description">
<p>replaces the destination with the source if it
is darker, otherwise keeps the source. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-LIGHTEN:CAPS"></a>CAIRO_OPERATOR_LIGHTEN</p></td>
<td class="enum_member_description">
<p>replaces the destination with the source if it
is lighter, otherwise keeps the source. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-COLOR-DODGE:CAPS"></a>CAIRO_OPERATOR_COLOR_DODGE</p></td>
<td class="enum_member_description">
<p>brightens the destination color to reflect
the source color. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-COLOR-BURN:CAPS"></a>CAIRO_OPERATOR_COLOR_BURN</p></td>
<td class="enum_member_description">
<p>darkens the destination color to reflect
the source color. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-HARD-LIGHT:CAPS"></a>CAIRO_OPERATOR_HARD_LIGHT</p></td>
<td class="enum_member_description">
<p>Multiplies or screens, dependent on source
color. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-SOFT-LIGHT:CAPS"></a>CAIRO_OPERATOR_SOFT_LIGHT</p></td>
<td class="enum_member_description">
<p>Darkens or lightens, dependent on source
color. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-DIFFERENCE:CAPS"></a>CAIRO_OPERATOR_DIFFERENCE</p></td>
<td class="enum_member_description">
<p>Takes the difference of the source and
destination color. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-EXCLUSION:CAPS"></a>CAIRO_OPERATOR_EXCLUSION</p></td>
<td class="enum_member_description">
<p>Produces an effect similar to difference, but
with lower contrast. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-HSL-HUE:CAPS"></a>CAIRO_OPERATOR_HSL_HUE</p></td>
<td class="enum_member_description">
<p>Creates a color with the hue of the source
and the saturation and luminosity of the target. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-HSL-SATURATION:CAPS"></a>CAIRO_OPERATOR_HSL_SATURATION</p></td>
<td class="enum_member_description">
<p>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 produces no change. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-HSL-COLOR:CAPS"></a>CAIRO_OPERATOR_HSL_COLOR</p></td>
<td class="enum_member_description">
<p>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. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-OPERATOR-HSL-LUMINOSITY:CAPS"></a>CAIRO_OPERATOR_HSL_LUMINOSITY</p></td>
<td class="enum_member_description">
<p>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>
. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-rectangle-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><span class="type">double</span> <em class="structfield"><code><a name="cairo-rectangle-t.x"></a>x</code></em>;</p></td>
<td class="struct_member_description"><p>X coordinate of the left side of the rectangle</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">double</span> <em class="structfield"><code><a name="cairo-rectangle-t.y"></a>y</code></em>;</p></td>
<td class="struct_member_description"><p>Y coordinate of the the top side of the rectangle</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">double</span> <em class="structfield"><code><a name="cairo-rectangle-t.width"></a>width</code></em>;</p></td>
<td class="struct_member_description"><p>width of the rectangle</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">double</span> <em class="structfield"><code><a name="cairo-rectangle-t.height"></a>height</code></em>;</p></td>
<td class="struct_member_description"><p>height of the rectangle</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<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="refsect3">
<a name="cairo-rectangle-list-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><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>;</p></td>
<td class="struct_member_description"><p>Error status of the rectangle list</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><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>;</p></td>
<td class="struct_member_description"><p>Array containing the rectangles</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">int</span> <em class="structfield"><code><a name="cairo-rectangle-list-t.num-rectangles"></a>num_rectangles</code></em>;</p></td>
<td class="struct_member_description"><p>Number of rectangles in this list</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.4</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-cairo-t.see-also"></a><h2>See Also</h2>
<p><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a></p>
</div>
</div>
<div class="footer">
<hr>Generated by GTK-Doc V1.27</div>
</body>
</html>
|
