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
|
<!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_pattern_t</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
<link rel="home" href="index.html" title="Cairo: A Vector Graphics Library">
<link rel="up" href="cairo-drawing.html" title="Drawing">
<link rel="prev" href="cairo-Paths.html" title="Paths">
<link rel="next" href="cairo-Regions.html" title="Regions">
<meta name="generator" content="GTK-Doc V1.15 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2">
<tr valign="middle">
<td><a accesskey="p" href="cairo-Paths.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
<td><a accesskey="u" href="cairo-drawing.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td>
<th width="100%" align="center">Cairo: A Vector Graphics Library</th>
<td><a accesskey="n" href="cairo-Regions.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
</tr>
<tr><td colspan="5" class="shortcuts">
<a href="#cairo-cairo-pattern-t.synopsis" class="shortcut">Top</a>
|
<a href="#cairo-cairo-pattern-t.description" class="shortcut">Description</a>
</td></tr>
</table>
<div class="refentry" title="cairo_pattern_t">
<a name="cairo-cairo-pattern-t"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cairo-cairo-pattern-t.top_of_page"></a>cairo_pattern_t</span></h2>
<p>cairo_pattern_t — Sources for drawing</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="cairo-cairo-pattern-t.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">typedef <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t">cairo_pattern_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-add-color-stop-rgb" title="cairo_pattern_add_color_stop_rgb ()">cairo_pattern_add_color_stop_rgb</a> (<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>,
<em class="parameter"><code><span class="type">double</span> offset</code></em>,
<em class="parameter"><code><span class="type">double</span> red</code></em>,
<em class="parameter"><code><span class="type">double</span> green</code></em>,
<em class="parameter"><code><span class="type">double</span> blue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-add-color-stop-rgba" title="cairo_pattern_add_color_stop_rgba ()">cairo_pattern_add_color_stop_rgba</a> (<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>,
<em class="parameter"><code><span class="type">double</span> offset</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>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-color-stop-count" title="cairo_pattern_get_color_stop_count ()">cairo_pattern_get_color_stop_count</a> (<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>,
<em class="parameter"><code><span class="type">int</span> *count</code></em>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-color-stop-rgba" title="cairo_pattern_get_color_stop_rgba ()">cairo_pattern_get_color_stop_rgba</a> (<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>,
<em class="parameter"><code><span class="type">int</span> index</code></em>,
<em class="parameter"><code><span class="type">double</span> *offset</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>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-rgb" title="cairo_pattern_create_rgb ()">cairo_pattern_create_rgb</a> (<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>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-rgba" title="cairo_pattern_create_rgba ()">cairo_pattern_create_rgba</a> (<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>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-rgba" title="cairo_pattern_get_rgba ()">cairo_pattern_get_rgba</a> (<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>,
<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>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-for-surface" title="cairo_pattern_create_for_surface ()">cairo_pattern_create_for_surface</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-surface" title="cairo_pattern_get_surface ()">cairo_pattern_get_surface</a> (<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>,
<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>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-linear" title="cairo_pattern_create_linear ()">cairo_pattern_create_linear</a> (<em class="parameter"><code><span class="type">double</span> x0</code></em>,
<em class="parameter"><code><span class="type">double</span> y0</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>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-linear-points" title="cairo_pattern_get_linear_points ()">cairo_pattern_get_linear_points</a> (<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>,
<em class="parameter"><code><span class="type">double</span> *x0</code></em>,
<em class="parameter"><code><span class="type">double</span> *y0</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>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-radial" title="cairo_pattern_create_radial ()">cairo_pattern_create_radial</a> (<em class="parameter"><code><span class="type">double</span> cx0</code></em>,
<em class="parameter"><code><span class="type">double</span> cy0</code></em>,
<em class="parameter"><code><span class="type">double</span> radius0</code></em>,
<em class="parameter"><code><span class="type">double</span> cx1</code></em>,
<em class="parameter"><code><span class="type">double</span> cy1</code></em>,
<em class="parameter"><code><span class="type">double</span> radius1</code></em>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-radial-circles" title="cairo_pattern_get_radial_circles ()">cairo_pattern_get_radial_circles</a> (<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>,
<em class="parameter"><code><span class="type">double</span> *x0</code></em>,
<em class="parameter"><code><span class="type">double</span> *y0</code></em>,
<em class="parameter"><code><span class="type">double</span> *r0</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> *r1</code></em>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="returnvalue">cairo_pattern_t</span></a> * <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-reference" title="cairo_pattern_reference ()">cairo_pattern_reference</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> *pattern</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-destroy" title="cairo_pattern_destroy ()">cairo_pattern_destroy</a> (<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>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-status" title="cairo_pattern_status ()">cairo_pattern_status</a> (<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>);
enum <a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t">cairo_extend_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-set-extend" title="cairo_pattern_set_extend ()">cairo_pattern_set_extend</a> (<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>,
<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t"><span class="type">cairo_extend_t</span></a> extend</code></em>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t"><span class="returnvalue">cairo_extend_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-extend" title="cairo_pattern_get_extend ()">cairo_pattern_get_extend</a> (<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>);
enum <a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t">cairo_filter_t</a>;
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-set-filter" title="cairo_pattern_set_filter ()">cairo_pattern_set_filter</a> (<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>,
<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t"><span class="type">cairo_filter_t</span></a> filter</code></em>);
<a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t"><span class="returnvalue">cairo_filter_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-filter" title="cairo_pattern_get_filter ()">cairo_pattern_get_filter</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> *pattern</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-set-matrix" title="cairo_pattern_set_matrix ()">cairo_pattern_set_matrix</a> (<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>,
<em class="parameter"><code>const <a class="link" href="cairo-cairo-matrix-t.html#cairo-matrix-t" title="cairo_matrix_t"><span class="type">cairo_matrix_t</span></a> *matrix</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-matrix" title="cairo_pattern_get_matrix ()">cairo_pattern_get_matrix</a> (<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>,
<em class="parameter"><code><a class="link" href="cairo-cairo-matrix-t.html#cairo-matrix-t" title="cairo_matrix_t"><span class="type">cairo_matrix_t</span></a> *matrix</code></em>);
enum <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-type-t" title="enum cairo_pattern_type_t">cairo_pattern_type_t</a>;
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-type-t" title="enum cairo_pattern_type_t"><span class="returnvalue">cairo_pattern_type_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-type" title="cairo_pattern_get_type ()">cairo_pattern_get_type</a> (<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>);
unsigned <span class="returnvalue">int</span> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-reference-count" title="cairo_pattern_get_reference_count ()">cairo_pattern_get_reference_count</a> (<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>);
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a> <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-set-user-data" title="cairo_pattern_set_user_data ()">cairo_pattern_set_user_data</a> (<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>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> *key</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
<em class="parameter"><code><a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> destroy</code></em>);
<span class="returnvalue">void</span> * <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-user-data" title="cairo_pattern_get_user_data ()">cairo_pattern_get_user_data</a> (<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>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> *key</code></em>);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="cairo-cairo-pattern-t.description"></a><h2>Description</h2>
<p>
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> is the paint with which cairo draws.
The primary use of patterns is as the source for all cairo drawing
operations, although they can also be used as masks, that is, as the
brush too.
</p>
<p>
A cairo pattern is created by using one of the many constructors,
of the form cairo_pattern_create_<span class="emphasis"><em>type</em></span>()
or implicitly through
cairo_set_source_<span class="emphasis"><em>type</em></span>() functions.
</p>
</div>
<div class="refsect1" title="Details">
<a name="cairo-cairo-pattern-t.details"></a><h2>Details</h2>
<div class="refsect2" title="cairo_pattern_t">
<a name="cairo-pattern-t"></a><h3>cairo_pattern_t</h3>
<pre class="programlisting">typedef struct _cairo_pattern cairo_pattern_t;
</pre>
<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> represents a source when drawing onto a
surface. There are different subtypes of <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>,
for different types of sources; for example,
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-rgb" title="cairo_pattern_create_rgb ()"><code class="function">cairo_pattern_create_rgb()</code></a> creates a pattern for a solid
opaque color.
</p>
<p>
Other than various cairo_pattern_create_<span class="emphasis"><em>type</em></span>()
functions, some of the pattern types can be implicitly created
using various cairo_set_source_<span class="emphasis"><em>type</em></span>() functions;
for example <a class="link" href="cairo-cairo-t.html#cairo-set-source-rgb" title="cairo_set_source_rgb ()"><code class="function">cairo_set_source_rgb()</code></a>.
</p>
<p>
The type of a pattern can be queried with <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-type" title="cairo_pattern_get_type ()"><code class="function">cairo_pattern_get_type()</code></a>.
</p>
<p>
Memory management of <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> is done with
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-reference" title="cairo_pattern_reference ()"><code class="function">cairo_pattern_reference()</code></a> and <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-destroy" title="cairo_pattern_destroy ()"><code class="function">cairo_pattern_destroy()</code></a>.
</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_add_color_stop_rgb ()">
<a name="cairo-pattern-add-color-stop-rgb"></a><h3>cairo_pattern_add_color_stop_rgb ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_pattern_add_color_stop_rgb (<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>,
<em class="parameter"><code><span class="type">double</span> offset</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>
Adds an opaque color stop to a gradient pattern. The offset
specifies the location along the gradient's control vector. For
example, a linear gradient's control vector is from (x0,y0) to
(x1,y1) while a radial gradient's control vector is from any point
on the start circle to the corresponding point on the end circle.
</p>
<p>
The color is specified in the same way as in <a class="link" href="cairo-cairo-t.html#cairo-set-source-rgb" title="cairo_set_source_rgb ()"><code class="function">cairo_set_source_rgb()</code></a>.
</p>
<p>
If two (or more) stops are specified with identical offset values,
they will be sorted according to the order in which the stops are
added, (stops added earlier will compare less than stops added
later). This can be useful for reliably making sharp color
transitions instead of the typical blend.
</p>
<p>
Note: If the pattern is not a gradient pattern, (eg. a linear or
radial pattern), then the pattern will be put into an error status
with a status of <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>an offset in the range [0.0 .. 1.0]
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>red component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>green component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>blue component of color
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_add_color_stop_rgba ()">
<a name="cairo-pattern-add-color-stop-rgba"></a><h3>cairo_pattern_add_color_stop_rgba ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_pattern_add_color_stop_rgba (<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>,
<em class="parameter"><code><span class="type">double</span> offset</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>
Adds a translucent color stop to a gradient pattern. The offset
specifies the location along the gradient's control vector. For
example, a linear gradient's control vector is from (x0,y0) to
(x1,y1) while a radial gradient's control vector is from any point
on the start circle to the corresponding point on the end circle.
</p>
<p>
The color is specified in the same way as in <a class="link" href="cairo-cairo-t.html#cairo-set-source-rgba" title="cairo_set_source_rgba ()"><code class="function">cairo_set_source_rgba()</code></a>.
</p>
<p>
If two (or more) stops are specified with identical offset values,
they will be sorted according to the order in which the stops are
added, (stops added earlier will compare less than stops added
later). This can be useful for reliably making sharp color
transitions instead of the typical blend.
</p>
<p>
Note: If the pattern is not a gradient pattern, (eg. a linear or
radial pattern), then the pattern will be put into an error status
with a status of <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>an offset in the range [0.0 .. 1.0]
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>red component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>green component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>blue component of color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha</code></em> :</span></p></td>
<td>alpha component of color
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_color_stop_count ()">
<a name="cairo-pattern-get-color-stop-count"></a><h3>cairo_pattern_get_color_stop_count ()</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_pattern_get_color_stop_count (<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>,
<em class="parameter"><code><span class="type">int</span> *count</code></em>);</pre>
<p>
Gets the number of color stops specified in the given gradient
pattern.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>count</code></em> :</span></p></td>
<td>return value for the number of color stops, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>, or
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a> if <em class="parameter"><code>pattern</code></em> is not a gradient
pattern.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_color_stop_rgba ()">
<a name="cairo-pattern-get-color-stop-rgba"></a><h3>cairo_pattern_get_color_stop_rgba ()</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_pattern_get_color_stop_rgba (<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>,
<em class="parameter"><code><span class="type">int</span> index</code></em>,
<em class="parameter"><code><span class="type">double</span> *offset</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>
Gets the color and offset information at the given <em class="parameter"><code>index</code></em> for a
gradient pattern. Values of <em class="parameter"><code>index</code></em> are 0 to 1 less than the number
returned by <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-color-stop-count" title="cairo_pattern_get_color_stop_count ()"><code class="function">cairo_pattern_get_color_stop_count()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>index</code></em> :</span></p></td>
<td>index of the stop to return data for
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>return value for the offset of the stop, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>return value for red component of color, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>return value for green component of color, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>return value for blue component of color, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha</code></em> :</span></p></td>
<td>return value for alpha component of color, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>, or <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-INVALID-INDEX:CAPS"><code class="literal">CAIRO_STATUS_INVALID_INDEX</code></a>
if <em class="parameter"><code>index</code></em> is not valid for the given pattern. If the pattern is
not a gradient pattern, <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a> is
returned.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_create_rgb ()">
<a name="cairo-pattern-create-rgb"></a><h3>cairo_pattern_create_rgb ()</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_pattern_create_rgb (<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>
Creates a new <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> corresponding to an opaque color. The
color components are floating point numbers in the range 0 to 1.
If the values passed in are outside that range, they will be
clamped.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>red component of the color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>green component of the color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>blue component of the color
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the newly created <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> if successful, or
an error pattern in case of no memory. 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.
This function will always return a valid pointer, but if an error
occurred the pattern status will be set to an error. To inspect
the status of a pattern use <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-status" title="cairo_pattern_status ()"><code class="function">cairo_pattern_status()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_create_rgba ()">
<a name="cairo-pattern-create-rgba"></a><h3>cairo_pattern_create_rgba ()</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_pattern_create_rgba (<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>
Creates a new <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> corresponding to a translucent color.
The color components are floating point numbers in the range 0 to
1. If the values passed in are outside that range, they will be
clamped.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>red component of the color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>green component of the color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>blue component of the color
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha</code></em> :</span></p></td>
<td>alpha component of the color
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the newly created <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> if successful, or
an error pattern in case of no memory. 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.
This function will always return a valid pointer, but if an error
occurred the pattern status will be set to an error. To inspect
the status of a pattern use <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-status" title="cairo_pattern_status ()"><code class="function">cairo_pattern_status()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_rgba ()">
<a name="cairo-pattern-get-rgba"></a><h3>cairo_pattern_get_rgba ()</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_pattern_get_rgba (<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>,
<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>
Gets the solid color for a solid color pattern.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>return value for red component of color, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>return value for green component of color, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>return value for blue component of color, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha</code></em> :</span></p></td>
<td>return value for alpha component of color, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>, or
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a> if the pattern is not a solid
color pattern.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_create_for_surface ()">
<a name="cairo-pattern-create-for-surface"></a><h3>cairo_pattern_create_for_surface ()</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_pattern_create_for_surface (<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>);</pre>
<p>
Create a new <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> for the given surface.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>the surface
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the newly created <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> if successful, or
an error pattern in case of no memory. 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.
This function will always return a valid pointer, but if an error
occurred the pattern status will be set to an error. To inspect
the status of a pattern use <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-status" title="cairo_pattern_status ()"><code class="function">cairo_pattern_status()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_surface ()">
<a name="cairo-pattern-get-surface"></a><h3>cairo_pattern_get_surface ()</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_pattern_get_surface (<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>,
<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>);</pre>
<p>
Gets the surface of a surface pattern. The reference returned in
<em class="parameter"><code>surface</code></em> is owned by the pattern; the caller should 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> if the surface is to be retained.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>return value for surface of pattern, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>, or
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a> if the pattern is not a surface
pattern.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_create_linear ()">
<a name="cairo-pattern-create-linear"></a><h3>cairo_pattern_create_linear ()</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_pattern_create_linear (<em class="parameter"><code><span class="type">double</span> x0</code></em>,
<em class="parameter"><code><span class="type">double</span> y0</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>);</pre>
<p>
Create a new linear gradient <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> along the line defined
by (x0, y0) and (x1, y1). Before using the gradient pattern, a
number of color stops should be defined using
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-add-color-stop-rgb" title="cairo_pattern_add_color_stop_rgb ()"><code class="function">cairo_pattern_add_color_stop_rgb()</code></a> or
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-add-color-stop-rgba" title="cairo_pattern_add_color_stop_rgba ()"><code class="function">cairo_pattern_add_color_stop_rgba()</code></a>.
</p>
<p>
Note: The coordinates here are in pattern space. For a new pattern,
pattern space is identical to user space, but the relationship
between the spaces can be changed with <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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>x0</code></em> :</span></p></td>
<td>x coordinate of the start point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y0</code></em> :</span></p></td>
<td>y coordinate of the start point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td>x coordinate of the end point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td>y coordinate of the end point
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the newly created <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> if successful, or
an error pattern in case of no memory. 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.
This function will always return a valid pointer, but if an error
occurred the pattern status will be set to an error. To inspect
the status of a pattern use <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-status" title="cairo_pattern_status ()"><code class="function">cairo_pattern_status()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_linear_points ()">
<a name="cairo-pattern-get-linear-points"></a><h3>cairo_pattern_get_linear_points ()</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_pattern_get_linear_points (<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>,
<em class="parameter"><code><span class="type">double</span> *x0</code></em>,
<em class="parameter"><code><span class="type">double</span> *y0</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>);</pre>
<p>
Gets the gradient endpoints for a linear gradient.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x0</code></em> :</span></p></td>
<td>return value for the x coordinate of the first point, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y0</code></em> :</span></p></td>
<td>return value for the y coordinate of the first point, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td>return value for the x coordinate of the second point, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td>return value for the y coordinate of the second point, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>, or
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a> if <em class="parameter"><code>pattern</code></em> is not a linear
gradient pattern.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_create_radial ()">
<a name="cairo-pattern-create-radial"></a><h3>cairo_pattern_create_radial ()</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_pattern_create_radial (<em class="parameter"><code><span class="type">double</span> cx0</code></em>,
<em class="parameter"><code><span class="type">double</span> cy0</code></em>,
<em class="parameter"><code><span class="type">double</span> radius0</code></em>,
<em class="parameter"><code><span class="type">double</span> cx1</code></em>,
<em class="parameter"><code><span class="type">double</span> cy1</code></em>,
<em class="parameter"><code><span class="type">double</span> radius1</code></em>);</pre>
<p>
Creates a new radial gradient <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> between the two
circles defined by (cx0, cy0, radius0) and (cx1, cy1, radius1). Before using the
gradient pattern, a number of color stops should be defined using
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-add-color-stop-rgb" title="cairo_pattern_add_color_stop_rgb ()"><code class="function">cairo_pattern_add_color_stop_rgb()</code></a> or
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-add-color-stop-rgba" title="cairo_pattern_add_color_stop_rgba ()"><code class="function">cairo_pattern_add_color_stop_rgba()</code></a>.
</p>
<p>
Note: The coordinates here are in pattern space. For a new pattern,
pattern space is identical to user space, but the relationship
between the spaces can be changed with <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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cx0</code></em> :</span></p></td>
<td>x coordinate for the center of the start circle
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cy0</code></em> :</span></p></td>
<td>y coordinate for the center of the start circle
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>radius0</code></em> :</span></p></td>
<td>radius of the start circle
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cx1</code></em> :</span></p></td>
<td>x coordinate for the center of the end circle
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cy1</code></em> :</span></p></td>
<td>y coordinate for the center of the end circle
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>radius1</code></em> :</span></p></td>
<td>radius of the end circle
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the newly created <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> if successful, or
an error pattern in case of no memory. 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.
This function will always return a valid pointer, but if an error
occurred the pattern status will be set to an error. To inspect
the status of a pattern use <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-status" title="cairo_pattern_status ()"><code class="function">cairo_pattern_status()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_radial_circles ()">
<a name="cairo-pattern-get-radial-circles"></a><h3>cairo_pattern_get_radial_circles ()</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_pattern_get_radial_circles (<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>,
<em class="parameter"><code><span class="type">double</span> *x0</code></em>,
<em class="parameter"><code><span class="type">double</span> *y0</code></em>,
<em class="parameter"><code><span class="type">double</span> *r0</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> *r1</code></em>);</pre>
<p>
Gets the gradient endpoint circles for a radial gradient, each
specified as a center coordinate and a radius.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x0</code></em> :</span></p></td>
<td>return value for the x coordinate of the center of the first circle, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y0</code></em> :</span></p></td>
<td>return value for the y coordinate of the center of the first circle, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r0</code></em> :</span></p></td>
<td>return value for the radius of the first circle, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td>return value for the x coordinate of the center of the second circle, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td>return value for the y coordinate of the center of the second circle, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r1</code></em> :</span></p></td>
<td>return value for the radius of the second circle, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>, or
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a> if <em class="parameter"><code>pattern</code></em> is not a radial
gradient pattern.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_reference ()">
<a name="cairo-pattern-reference"></a><h3>cairo_pattern_reference ()</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_pattern_reference (<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>
Increases the reference count on <em class="parameter"><code>pattern</code></em> by one. This prevents
<em class="parameter"><code>pattern</code></em> from being destroyed until a matching call to
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-destroy" title="cairo_pattern_destroy ()"><code class="function">cairo_pattern_destroy()</code></a> is made.
</p>
<p>
The number of references to 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> can be get using
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-reference-count" title="cairo_pattern_get_reference_count ()"><code class="function">cairo_pattern_get_reference_count()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the referenced <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_destroy ()">
<a name="cairo-pattern-destroy"></a><h3>cairo_pattern_destroy ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_pattern_destroy (<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>
Decreases the reference count on <em class="parameter"><code>pattern</code></em> by one. If the result is
zero, then <em class="parameter"><code>pattern</code></em> and all associated resources are freed. See
<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 class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_status ()">
<a name="cairo-pattern-status"></a><h3>cairo_pattern_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_pattern_status (<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>
Checks whether an error has previously occurred for this
pattern.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>, <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-NO-MEMORY:CAPS"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></a>, or
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum cairo_extend_t">
<a name="cairo-extend-t"></a><h3>enum cairo_extend_t</h3>
<pre class="programlisting">typedef enum _cairo_extend {
CAIRO_EXTEND_NONE,
CAIRO_EXTEND_REPEAT,
CAIRO_EXTEND_REFLECT,
CAIRO_EXTEND_PAD
} cairo_extend_t;
</pre>
<p>
<a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t"><span class="type">cairo_extend_t</span></a> is used to describe how pattern color/alpha will be
determined for areas "outside" the pattern's natural area, (for
example, outside the surface bounds or outside the gradient
geometry).
</p>
<p>
The default extend mode is <a class="link" href="cairo-cairo-pattern-t.html#CAIRO-EXTEND-NONE:CAPS"><code class="literal">CAIRO_EXTEND_NONE</code></a> for surface patterns
and <a class="link" href="cairo-cairo-pattern-t.html#CAIRO-EXTEND-PAD:CAPS"><code class="literal">CAIRO_EXTEND_PAD</code></a> for gradient patterns.
</p>
<p>
New entries may be added in future versions.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CAIRO-EXTEND-NONE:CAPS"></a><span class="term"><code class="literal">CAIRO_EXTEND_NONE</code></span></p></td>
<td>pixels outside of the source pattern
are fully transparent
</td>
</tr>
<tr>
<td><p><a name="CAIRO-EXTEND-REPEAT:CAPS"></a><span class="term"><code class="literal">CAIRO_EXTEND_REPEAT</code></span></p></td>
<td>the pattern is tiled by repeating
</td>
</tr>
<tr>
<td><p><a name="CAIRO-EXTEND-REFLECT:CAPS"></a><span class="term"><code class="literal">CAIRO_EXTEND_REFLECT</code></span></p></td>
<td>the pattern is tiled by reflecting
at the edges (Implemented for surface patterns since 1.6)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-EXTEND-PAD:CAPS"></a><span class="term"><code class="literal">CAIRO_EXTEND_PAD</code></span></p></td>
<td>pixels outside of the pattern copy
the closest pixel from the source (Since 1.2; but only
implemented for surface patterns since 1.6)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_set_extend ()">
<a name="cairo-pattern-set-extend"></a><h3>cairo_pattern_set_extend ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_pattern_set_extend (<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>,
<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t"><span class="type">cairo_extend_t</span></a> extend</code></em>);</pre>
<p>
Sets the mode to be used for drawing outside the area of a pattern.
See <a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t"><span class="type">cairo_extend_t</span></a> for details on the semantics of each extend
strategy.
</p>
<p>
The default extend mode is <a class="link" href="cairo-cairo-pattern-t.html#CAIRO-EXTEND-NONE:CAPS"><code class="literal">CAIRO_EXTEND_NONE</code></a> for surface patterns
and <a class="link" href="cairo-cairo-pattern-t.html#CAIRO-EXTEND-PAD:CAPS"><code class="literal">CAIRO_EXTEND_PAD</code></a> for gradient patterns.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>extend</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t"><span class="type">cairo_extend_t</span></a> describing how the area outside of the
pattern will be drawn
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_extend ()">
<a name="cairo-pattern-get-extend"></a><h3>cairo_pattern_get_extend ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t"><span class="returnvalue">cairo_extend_t</span></a> cairo_pattern_get_extend (<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>
Gets the current extend mode for a pattern. See <a class="link" href="cairo-cairo-pattern-t.html#cairo-extend-t" title="enum cairo_extend_t"><span class="type">cairo_extend_t</span></a>
for details on the semantics of each extend strategy.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current extend strategy used for drawing the
pattern.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum cairo_filter_t">
<a name="cairo-filter-t"></a><h3>enum cairo_filter_t</h3>
<pre class="programlisting">typedef enum _cairo_filter {
CAIRO_FILTER_FAST,
CAIRO_FILTER_GOOD,
CAIRO_FILTER_BEST,
CAIRO_FILTER_NEAREST,
CAIRO_FILTER_BILINEAR,
CAIRO_FILTER_GAUSSIAN
} cairo_filter_t;
</pre>
<p>
<a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t"><span class="type">cairo_filter_t</span></a> is used to indicate what filtering should be
applied when reading pixel values from patterns. See
<code class="function">cairo_pattern_set_source()</code> for indicating the desired filter to be
used with a particular pattern.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CAIRO-FILTER-FAST:CAPS"></a><span class="term"><code class="literal">CAIRO_FILTER_FAST</code></span></p></td>
<td>A high-performance filter, with quality similar
to <a class="link" href="cairo-cairo-pattern-t.html#CAIRO-FILTER-NEAREST:CAPS"><code class="literal">CAIRO_FILTER_NEAREST</code></a>
</td>
</tr>
<tr>
<td><p><a name="CAIRO-FILTER-GOOD:CAPS"></a><span class="term"><code class="literal">CAIRO_FILTER_GOOD</code></span></p></td>
<td>A reasonable-performance filter, with quality
similar to <a class="link" href="cairo-cairo-pattern-t.html#CAIRO-FILTER-BILINEAR:CAPS"><code class="literal">CAIRO_FILTER_BILINEAR</code></a>
</td>
</tr>
<tr>
<td><p><a name="CAIRO-FILTER-BEST:CAPS"></a><span class="term"><code class="literal">CAIRO_FILTER_BEST</code></span></p></td>
<td>The highest-quality available, performance may
not be suitable for interactive use.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-FILTER-NEAREST:CAPS"></a><span class="term"><code class="literal">CAIRO_FILTER_NEAREST</code></span></p></td>
<td>Nearest-neighbor filtering
</td>
</tr>
<tr>
<td><p><a name="CAIRO-FILTER-BILINEAR:CAPS"></a><span class="term"><code class="literal">CAIRO_FILTER_BILINEAR</code></span></p></td>
<td>Linear interpolation in two dimensions
</td>
</tr>
<tr>
<td><p><a name="CAIRO-FILTER-GAUSSIAN:CAPS"></a><span class="term"><code class="literal">CAIRO_FILTER_GAUSSIAN</code></span></p></td>
<td>This filter value is currently
unimplemented, and should not be used in current code.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_set_filter ()">
<a name="cairo-pattern-set-filter"></a><h3>cairo_pattern_set_filter ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_pattern_set_filter (<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>,
<em class="parameter"><code><a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t"><span class="type">cairo_filter_t</span></a> filter</code></em>);</pre>
<p>
Sets the filter to be used for resizing when using this pattern.
See <a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t"><span class="type">cairo_filter_t</span></a> for details on each filter.
</p>
<p>
* Note that you might want to control filtering even when you do not
have an explicit <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> object, (for example when using
<a class="link" href="cairo-cairo-t.html#cairo-set-source-surface" title="cairo_set_source_surface ()"><code class="function">cairo_set_source_surface()</code></a>). In these cases, it is convenient to
use <a class="link" href="cairo-cairo-t.html#cairo-get-source" title="cairo_get_source ()"><code class="function">cairo_get_source()</code></a> to get access to the pattern that cairo
creates implicitly. For example:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
cairo_set_source_surface (cr, image, x, y);
cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
</pre></div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filter</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t"><span class="type">cairo_filter_t</span></a> describing the filter to use for resizing
the pattern
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_filter ()">
<a name="cairo-pattern-get-filter"></a><h3>cairo_pattern_get_filter ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t"><span class="returnvalue">cairo_filter_t</span></a> cairo_pattern_get_filter (<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>
Gets the current filter for a pattern. See <a class="link" href="cairo-cairo-pattern-t.html#cairo-filter-t" title="enum cairo_filter_t"><span class="type">cairo_filter_t</span></a>
for details on each filter.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current filter used for resizing the pattern.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_set_matrix ()">
<a name="cairo-pattern-set-matrix"></a><h3>cairo_pattern_set_matrix ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_pattern_set_matrix (<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>,
<em class="parameter"><code>const <a class="link" href="cairo-cairo-matrix-t.html#cairo-matrix-t" title="cairo_matrix_t"><span class="type">cairo_matrix_t</span></a> *matrix</code></em>);</pre>
<p>
Sets the pattern's transformation matrix to <em class="parameter"><code>matrix</code></em>. This matrix is
a transformation from user space to pattern space.
</p>
<p>
When a pattern is first created it always has the identity matrix
for its transformation matrix, which means that pattern space is
initially identical to user space.
</p>
<p>
Important: Please note that the direction of this transformation
matrix is from user space to pattern space. This means that if you
imagine the flow from a pattern to user space (and on to device
space), then coordinates in that flow will be transformed by the
inverse of the pattern matrix.
</p>
<p>
For example, if you want to make a pattern appear twice as large as
it does by default the correct code to use is:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
cairo_matrix_init_scale (&matrix, 0.5, 0.5);
cairo_pattern_set_matrix (pattern, &matrix);
</pre></div>
<p>
</p>
<p>
Meanwhile, using values of 2.0 rather than 0.5 in the code above
would cause the pattern to appear at half of its default size.
</p>
<p>
Also, please note the discussion of the user-space locking
semantics of <a class="link" href="cairo-cairo-t.html#cairo-set-source" title="cairo_set_source ()"><code class="function">cairo_set_source()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>matrix</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-matrix-t.html#cairo-matrix-t" title="cairo_matrix_t"><span class="type">cairo_matrix_t</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_matrix ()">
<a name="cairo-pattern-get-matrix"></a><h3>cairo_pattern_get_matrix ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_pattern_get_matrix (<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>,
<em class="parameter"><code><a class="link" href="cairo-cairo-matrix-t.html#cairo-matrix-t" title="cairo_matrix_t"><span class="type">cairo_matrix_t</span></a> *matrix</code></em>);</pre>
<p>
Stores the pattern's transformation matrix into <em class="parameter"><code>matrix</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>matrix</code></em> :</span></p></td>
<td>return value for the matrix
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum cairo_pattern_type_t">
<a name="cairo-pattern-type-t"></a><h3>enum cairo_pattern_type_t</h3>
<pre class="programlisting">typedef enum _cairo_pattern_type {
CAIRO_PATTERN_TYPE_SOLID,
CAIRO_PATTERN_TYPE_SURFACE,
CAIRO_PATTERN_TYPE_LINEAR,
CAIRO_PATTERN_TYPE_RADIAL
} cairo_pattern_type_t;
</pre>
<p>
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-type-t" title="enum cairo_pattern_type_t"><span class="type">cairo_pattern_type_t</span></a> is used to describe the type of a given pattern.
</p>
<p>
The type of a pattern is determined by the function used to create
it. The <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-rgb" title="cairo_pattern_create_rgb ()"><code class="function">cairo_pattern_create_rgb()</code></a> and <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-create-rgba" title="cairo_pattern_create_rgba ()"><code class="function">cairo_pattern_create_rgba()</code></a>
functions create SOLID patterns. The remaining
cairo_pattern_create functions map to pattern types in obvious
ways.
</p>
<p>
The pattern type can be queried with <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-get-type" title="cairo_pattern_get_type ()"><code class="function">cairo_pattern_get_type()</code></a>
</p>
<p>
Most <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a> functions can be called with a pattern of any
type, (though trying to change the extend or filter for a solid
pattern will have no effect). A notable exception is
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-add-color-stop-rgb" title="cairo_pattern_add_color_stop_rgb ()"><code class="function">cairo_pattern_add_color_stop_rgb()</code></a> and
<a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-add-color-stop-rgba" title="cairo_pattern_add_color_stop_rgba ()"><code class="function">cairo_pattern_add_color_stop_rgba()</code></a> which must only be called with
gradient patterns (either LINEAR or RADIAL). Otherwise the pattern
will be shutdown and put into an error state.
</p>
<p>
New entries may be added in future versions.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CAIRO-PATTERN-TYPE-SOLID:CAPS"></a><span class="term"><code class="literal">CAIRO_PATTERN_TYPE_SOLID</code></span></p></td>
<td>The pattern is a solid (uniform)
color. It may be opaque or translucent.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-PATTERN-TYPE-SURFACE:CAPS"></a><span class="term"><code class="literal">CAIRO_PATTERN_TYPE_SURFACE</code></span></p></td>
<td>The pattern is a based on a surface (an image).
</td>
</tr>
<tr>
<td><p><a name="CAIRO-PATTERN-TYPE-LINEAR:CAPS"></a><span class="term"><code class="literal">CAIRO_PATTERN_TYPE_LINEAR</code></span></p></td>
<td>The pattern is a linear gradient.
</td>
</tr>
<tr>
<td><p><a name="CAIRO-PATTERN-TYPE-RADIAL:CAPS"></a><span class="term"><code class="literal">CAIRO_PATTERN_TYPE_RADIAL</code></span></p></td>
<td>The pattern is a radial gradient.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_type ()">
<a name="cairo-pattern-get-type"></a><h3>cairo_pattern_get_type ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-type-t" title="enum cairo_pattern_type_t"><span class="returnvalue">cairo_pattern_type_t</span></a> cairo_pattern_get_type (<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>
This function returns the type a pattern.
See <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-type-t" title="enum cairo_pattern_type_t"><span class="type">cairo_pattern_type_t</span></a> for available types.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> The type of <em class="parameter"><code>pattern</code></em>.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_reference_count ()">
<a name="cairo-pattern-get-reference-count"></a><h3>cairo_pattern_get_reference_count ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span> cairo_pattern_get_reference_count (<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>
Returns the current reference count of <em class="parameter"><code>pattern</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current reference count of <em class="parameter"><code>pattern</code></em>. If the
object is a nil object, 0 will be returned.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_set_user_data ()">
<a name="cairo-pattern-set-user-data"></a><h3>cairo_pattern_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_pattern_set_user_data (<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>,
<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>pattern</code></em>. To remove user data from a surface,
call this function with the key that was used to set it and <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
for <em class="parameter"><code>data</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the address of a <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> to attach the user data to
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the user data to attach to the <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> which will be called when the
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a> is destroyed or when new user data is attached using the
same key.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a> or <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-NO-MEMORY:CAPS"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></a> if a
slot could not be allocated for the user data.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2" title="cairo_pattern_get_user_data ()">
<a name="cairo-pattern-get-user-data"></a><h3>cairo_pattern_get_user_data ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> * cairo_pattern_get_user_data (<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>,
<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>pattern</code></em> using the
specified key. If no user data has been attached with the given
key this function returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pattern</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the address of the <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> the user data was
attached to
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the user data previously attached or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
</div>
<div class="refsect1" title="See Also">
<a name="cairo-cairo-pattern-t.see-also"></a><h2>See Also</h2>
<a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></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>
</div>
</div>
<div class="footer">
<hr>
Generated by GTK-Doc V1.15</div>
</body>
</html>
|
