summaryrefslogtreecommitdiff
path: root/src/cairo-qt-surface.cpp
blob: ce05dba7ef97b8f0820e0a12c84e5174ad96915b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/* cairo - a vector graphics library with display and print output
 *
 * Copyright © 2008 Mozilla Corporation
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 * The Original Code is the cairo graphics library.
 *
 * The Initial Developer of the Original Code is Mozilla Corporation.
 *
 * Contributor(s):
 *      Vladimir Vukicevic <vladimir@mozilla.com>
 */

/* Get INT16_MIN etc. as per C99 */
#define __STDC_LIMIT_MACROS

#include "cairoint.h"

#include "cairo-clip-private.h"
#include "cairo-default-context-private.h"
#include "cairo-error-private.h"
#include "cairo-region-private.h"
#include "cairo-surface-clipper-private.h"
#include "cairo-types-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-pattern-private.h"
#include "cairo-surface-backend-private.h"
#include "cairo-surface-fallback-private.h"

#include "cairo-ft.h"
#include "cairo-qt.h"

#include <memory>

#include <QtGui/QPainter>
#include <QtGui/QPaintEngine>
#include <QtGui/QPaintDevice>
#include <QtGui/QImage>
#include <QtGui/QPixmap>
#include <QtGui/QBrush>
#include <QtGui/QPen>
#include <QWidget>
#include <QtCore/QVarLengthArray>

#if ((QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)) || defined(QT_GLYPHS_API_BACKPORT)) && 0
extern void qt_draw_glyphs(QPainter *, const quint32 *glyphs, const QPointF *positions, int count);
#endif

#include <sys/time.h>

/* Enable workaround slow regional Qt paths */
#define ENABLE_FAST_FILL 0
#define ENABLE_FAST_CLIP 0

#if 0
#define D(x)  x
static const char *
_opstr (cairo_operator_t op)
{
    const char *ops[] = {
        "CLEAR",
        "SOURCE",
        "OVER",
        "IN",
        "OUT",
        "ATOP",
        "DEST",
        "DEST_OVER",
        "DEST_IN",
        "DEST_OUT",
        "DEST_ATOP",
        "XOR",
        "ADD",
        "SATURATE"
    };

    if (op < CAIRO_OPERATOR_CLEAR || op > CAIRO_OPERATOR_SATURATE)
        return "(\?\?\?)";

    return ops[op];
}
#else
#define D(x) do { } while(0)
#endif

#ifndef CAIRO_INT_STATUS_SUCCESS
#define CAIRO_INT_STATUS_SUCCESS ((cairo_int_status_t) CAIRO_STATUS_SUCCESS)
#endif

/* Qt::PenStyle optimization based on the assumption that dots are 1*w and dashes are 3*w. */
#define DOT_LENGTH  1.0
#define DASH_LENGTH 3.0

struct cairo_qt_surface_t {
    cairo_surface_t base;

    cairo_bool_t supports_porter_duff;

    QPainter *p;

    /* The pixmap/image constructors will store their objects here */
    QPixmap *pixmap;
    QImage *image;

    QRect window;

    cairo_surface_clipper_t clipper;

    cairo_surface_t *image_equiv;
};

/* Will be true if we ever try to create a QPixmap and end
 * up with one without an alpha channel.
 */
static cairo_bool_t _qpixmaps_have_no_alpha = FALSE;

/*
 * Helper methods
 */

static QPainter::CompositionMode
_qpainter_compositionmode_from_cairo_op (cairo_operator_t op)
{
    switch (op) {
    case CAIRO_OPERATOR_CLEAR:
        return QPainter::CompositionMode_Clear;

    case CAIRO_OPERATOR_SOURCE:
        return QPainter::CompositionMode_Source;
    case CAIRO_OPERATOR_OVER:
        return QPainter::CompositionMode_SourceOver;
    case CAIRO_OPERATOR_IN:
        return QPainter::CompositionMode_SourceIn;
    case CAIRO_OPERATOR_OUT:
        return QPainter::CompositionMode_SourceOut;
    case CAIRO_OPERATOR_ATOP:
        return QPainter::CompositionMode_SourceAtop;

    case CAIRO_OPERATOR_DEST:
        return QPainter::CompositionMode_Destination;
    case CAIRO_OPERATOR_DEST_OVER:
        return QPainter::CompositionMode_DestinationOver;
    case CAIRO_OPERATOR_DEST_IN:
        return QPainter::CompositionMode_DestinationIn;
    case CAIRO_OPERATOR_DEST_OUT:
        return QPainter::CompositionMode_DestinationOut;
    case CAIRO_OPERATOR_DEST_ATOP:
        return QPainter::CompositionMode_DestinationAtop;

    case CAIRO_OPERATOR_XOR:
        return QPainter::CompositionMode_Xor;

    default:
    case CAIRO_OPERATOR_ADD:
    case CAIRO_OPERATOR_SATURATE:
    case CAIRO_OPERATOR_MULTIPLY:
    case CAIRO_OPERATOR_SCREEN:
    case CAIRO_OPERATOR_OVERLAY:
    case CAIRO_OPERATOR_DARKEN:
    case CAIRO_OPERATOR_LIGHTEN:
    case CAIRO_OPERATOR_COLOR_DODGE:
    case CAIRO_OPERATOR_COLOR_BURN:
    case CAIRO_OPERATOR_HARD_LIGHT:
    case CAIRO_OPERATOR_SOFT_LIGHT:
    case CAIRO_OPERATOR_DIFFERENCE:
    case CAIRO_OPERATOR_EXCLUSION:
    case CAIRO_OPERATOR_HSL_HUE:
    case CAIRO_OPERATOR_HSL_SATURATION:
    case CAIRO_OPERATOR_HSL_COLOR:
    case CAIRO_OPERATOR_HSL_LUMINOSITY:
	ASSERT_NOT_REACHED;
    }
}

static bool
_op_is_supported (cairo_qt_surface_t *qs, cairo_operator_t op)
{
    if (qs->p == NULL)
	return false;

    if (qs->supports_porter_duff) {
	switch (op) {
	case CAIRO_OPERATOR_CLEAR:
	case CAIRO_OPERATOR_SOURCE:
	case CAIRO_OPERATOR_OVER:
	case CAIRO_OPERATOR_IN:
	case CAIRO_OPERATOR_OUT:
	case CAIRO_OPERATOR_ATOP:

	case CAIRO_OPERATOR_DEST:
	case CAIRO_OPERATOR_DEST_OVER:
	case CAIRO_OPERATOR_DEST_IN:
	case CAIRO_OPERATOR_DEST_OUT:
	case CAIRO_OPERATOR_DEST_ATOP:

	case CAIRO_OPERATOR_XOR:
	    return TRUE;

	default:
	    ASSERT_NOT_REACHED;
	case CAIRO_OPERATOR_ADD:
	case CAIRO_OPERATOR_SATURATE:
	case CAIRO_OPERATOR_MULTIPLY:
	case CAIRO_OPERATOR_SCREEN:
	case CAIRO_OPERATOR_OVERLAY:
	case CAIRO_OPERATOR_DARKEN:
	case CAIRO_OPERATOR_LIGHTEN:
	case CAIRO_OPERATOR_COLOR_DODGE:
	case CAIRO_OPERATOR_COLOR_BURN:
	case CAIRO_OPERATOR_HARD_LIGHT:
	case CAIRO_OPERATOR_SOFT_LIGHT:
	case CAIRO_OPERATOR_DIFFERENCE:
	case CAIRO_OPERATOR_EXCLUSION:
	case CAIRO_OPERATOR_HSL_HUE:
	case CAIRO_OPERATOR_HSL_SATURATION:
	case CAIRO_OPERATOR_HSL_COLOR:
	case CAIRO_OPERATOR_HSL_LUMINOSITY:
	    return FALSE;

	}
    } else {
	return op == CAIRO_OPERATOR_OVER;
    }
}

static cairo_format_t
_cairo_format_from_qimage_format (QImage::Format fmt)
{
    switch (fmt) {
    case QImage::Format_ARGB32_Premultiplied:
        return CAIRO_FORMAT_ARGB32;
    case QImage::Format_RGB32:
        return CAIRO_FORMAT_RGB24;
    case QImage::Format_Indexed8: // XXX not quite
        return CAIRO_FORMAT_A8;
#ifdef WORDS_BIGENDIAN
    case QImage::Format_Mono:
#else
    case QImage::Format_MonoLSB:
#endif
        return CAIRO_FORMAT_A1;

    case QImage::Format_Invalid:
#ifdef WORDS_BIGENDIAN
    case QImage::Format_MonoLSB:
#else
    case QImage::Format_Mono:
#endif
    case QImage::Format_ARGB32:
    case QImage::Format_RGB16:
    case QImage::Format_ARGB8565_Premultiplied:
    case QImage::Format_RGB666:
    case QImage::Format_ARGB6666_Premultiplied:
    case QImage::Format_RGB555:
    case QImage::Format_ARGB8555_Premultiplied:
    case QImage::Format_RGB888:
    case QImage::Format_RGB444:
    case QImage::Format_ARGB4444_Premultiplied:
    case QImage::NImageFormats:
    default:
	ASSERT_NOT_REACHED;
        return (cairo_format_t) -1;
    }
}

static QImage::Format
_qimage_format_from_cairo_format (cairo_format_t fmt)
{
    switch (fmt) {
    case CAIRO_FORMAT_INVALID:
	ASSERT_NOT_REACHED;
    case CAIRO_FORMAT_ARGB32:
        return QImage::Format_ARGB32_Premultiplied;
    case CAIRO_FORMAT_RGB24:
        return QImage::Format_RGB32;
    case CAIRO_FORMAT_RGB16_565:
        return QImage::Format_RGB16;
    case CAIRO_FORMAT_A8:
        return QImage::Format_Indexed8; // XXX not quite
    case CAIRO_FORMAT_A1:
#ifdef WORDS_BIGENDIAN
        return QImage::Format_Mono; // XXX think we need to choose between this and LSB
#else
        return QImage::Format_MonoLSB;
#endif
    }

    return QImage::Format_Mono;
}

static inline QMatrix
_qmatrix_from_cairo_matrix (const cairo_matrix_t& m)
{
    return QMatrix(m.xx, m.yx, m.xy, m.yy, m.x0, m.y0);
}

/* Path conversion */
typedef struct _qpainter_path_transform {
    QPainterPath path;
    const cairo_matrix_t *ctm_inverse;
} qpainter_path_data;

/* cairo path -> execute in context */
static cairo_status_t
_cairo_path_to_qpainterpath_move_to (void *closure, const cairo_point_t *point)
{
    qpainter_path_data *pdata = static_cast <qpainter_path_data *> (closure);
    double x = _cairo_fixed_to_double (point->x);
    double y = _cairo_fixed_to_double (point->y);

    if (pdata->ctm_inverse)
        cairo_matrix_transform_point (pdata->ctm_inverse, &x, &y);

    pdata->path.moveTo(x, y);

    return CAIRO_STATUS_SUCCESS;
}

static cairo_status_t
_cairo_path_to_qpainterpath_line_to (void *closure, const cairo_point_t *point)
{
    qpainter_path_data *pdata = static_cast <qpainter_path_data *> (closure);
    double x = _cairo_fixed_to_double (point->x);
    double y = _cairo_fixed_to_double (point->y);

    if (pdata->ctm_inverse)
        cairo_matrix_transform_point (pdata->ctm_inverse, &x, &y);

    pdata->path.lineTo(x, y);

    return CAIRO_STATUS_SUCCESS;
}

static cairo_status_t
_cairo_path_to_qpainterpath_curve_to (void *closure, const cairo_point_t *p0, const cairo_point_t *p1, const cairo_point_t *p2)
{
    qpainter_path_data *pdata = static_cast <qpainter_path_data *> (closure);
    double x0 = _cairo_fixed_to_double (p0->x);
    double y0 = _cairo_fixed_to_double (p0->y);
    double x1 = _cairo_fixed_to_double (p1->x);
    double y1 = _cairo_fixed_to_double (p1->y);
    double x2 = _cairo_fixed_to_double (p2->x);
    double y2 = _cairo_fixed_to_double (p2->y);

    if (pdata->ctm_inverse) {
        cairo_matrix_transform_point (pdata->ctm_inverse, &x0, &y0);
        cairo_matrix_transform_point (pdata->ctm_inverse, &x1, &y1);
        cairo_matrix_transform_point (pdata->ctm_inverse, &x2, &y2);
    }

    pdata->path.cubicTo (x0, y0, x1, y1, x2, y2);

    return CAIRO_STATUS_SUCCESS;
}

static cairo_status_t
_cairo_path_to_qpainterpath_close_path (void *closure)
{
    qpainter_path_data *pdata = static_cast <qpainter_path_data *> (closure);

    pdata->path.closeSubpath();

    return CAIRO_STATUS_SUCCESS;
}

static inline QPainterPath
path_to_qt (const cairo_path_fixed_t *path,
	    const cairo_matrix_t *ctm_inverse = NULL)
{
    qpainter_path_data data;
    cairo_status_t status;

    if (ctm_inverse && _cairo_matrix_is_identity (ctm_inverse))
	ctm_inverse = NULL;
    data.ctm_inverse = ctm_inverse;

    status = _cairo_path_fixed_interpret (path,
					  _cairo_path_to_qpainterpath_move_to,
					  _cairo_path_to_qpainterpath_line_to,
					  _cairo_path_to_qpainterpath_curve_to,
					  _cairo_path_to_qpainterpath_close_path,
					  &data);
    assert (status == CAIRO_STATUS_SUCCESS);

    return data.path;
}

static inline QPainterPath
path_to_qt (const cairo_path_fixed_t *path,
	    cairo_fill_rule_t fill_rule,
	    cairo_matrix_t *ctm_inverse = NULL)
{
    QPainterPath qpath = path_to_qt (path, ctm_inverse);

    qpath.setFillRule (fill_rule == CAIRO_FILL_RULE_WINDING ?
			Qt::WindingFill :
			Qt::OddEvenFill);

    return qpath;
}

/*
 * Surface backend methods
 */
static cairo_surface_t *
_cairo_qt_surface_create_similar (void *abstract_surface,
				  cairo_content_t content,
				  int width,
				  int height)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
    bool use_pixmap;

    D(fprintf(stderr, "q[%p] create_similar: %d %d [%d] -> ", abstract_surface, width, height, content));

    use_pixmap = qs->image == NULL;
    if (use_pixmap) {
	switch (content) {
	case CAIRO_CONTENT_ALPHA:
	    use_pixmap = FALSE;
	    break;
	case CAIRO_CONTENT_COLOR:
	    break;
	case CAIRO_CONTENT_COLOR_ALPHA:
	    use_pixmap = ! _qpixmaps_have_no_alpha;
	    break;
	}
    }

    if (use_pixmap) {
	cairo_surface_t *result =
	    cairo_qt_surface_create_with_qpixmap (content, width, height);

	/* XXX result->content is always content. ??? */
	if (result->content == content) {
	    D(fprintf(stderr, "qpixmap content: %d\n", content));
	    return result;
	}

	_qpixmaps_have_no_alpha = TRUE;
	cairo_surface_destroy (result);
    }

    D(fprintf (stderr, "qimage\n"));
    return cairo_qt_surface_create_with_qimage
	(_cairo_format_from_content (content), width, height);
}

static cairo_status_t
_cairo_qt_surface_finish (void *abstract_surface)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    D(fprintf(stderr, "q[%p] finish\n", abstract_surface));

    /* Only delete p if we created it */
    if (qs->image || qs->pixmap)
        delete qs->p;
    else
	qs->p->restore ();

    if (qs->image_equiv)
        cairo_surface_destroy (qs->image_equiv);

    _cairo_surface_clipper_reset (&qs->clipper);

    if (qs->image)
        delete qs->image;

    if (qs->pixmap)
        delete qs->pixmap;

    return CAIRO_STATUS_SUCCESS;
}

static void
_qimg_destroy (void *closure)
{
    QImage *qimg = (QImage *) closure;
    delete qimg;
}

static cairo_status_t
_cairo_qt_surface_acquire_source_image (void *abstract_surface,
					cairo_image_surface_t **image_out,
					void **image_extra)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    D(fprintf(stderr, "q[%p] acquire_source_image\n", abstract_surface));

    *image_extra = NULL;

    if (qs->image_equiv) {
        *image_out = (cairo_image_surface_t*)
                     cairo_surface_reference (qs->image_equiv);

        return CAIRO_STATUS_SUCCESS;
    }

    if (qs->pixmap) {
        QImage *qimg = new QImage(qs->pixmap->toImage());
	cairo_surface_t *image;
	cairo_status_t status;

        image = cairo_image_surface_create_for_data (qimg->bits(),
						     _cairo_format_from_qimage_format (qimg->format()),
						     qimg->width(), qimg->height(),
						     qimg->bytesPerLine());

	status = _cairo_user_data_array_set_data (&image->user_data,
						  (const cairo_user_data_key_t *)&_qimg_destroy,
						  qimg,
						  _qimg_destroy);
	if (status) {
	    cairo_surface_destroy (image);
	    return status;
	}

	*image_out = (cairo_image_surface_t *) image;
        return CAIRO_STATUS_SUCCESS;
    }

    return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}

static void
_cairo_qt_surface_release_source_image (void *abstract_surface,
					cairo_image_surface_t *image,
					void *image_extra)
{
    //cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    D(fprintf(stderr, "q[%p] release_source_image\n", abstract_surface));

    cairo_surface_destroy (&image->base);
}

struct _qimage_surface {
    cairo_image_surface_t image;
    QImage *qimg;
};

static cairo_surface_t *
map_qimage_to_image (QImage *qimg, const cairo_rectangle_int_t *extents)
{
    struct _qimage_surface  *surface;
    pixman_image_t *pixman_image;
    pixman_format_code_t pixman_format;
    uint8_t *data;

    if (qimg == NULL)
        return _cairo_surface_create_in_error (CAIRO_STATUS_NO_MEMORY);

    switch (qimg->format()) {
    case QImage::Format_ARGB32_Premultiplied:
	pixman_format = PIXMAN_a8r8g8b8;
	break;
    case QImage::Format_RGB32:
	pixman_format = PIXMAN_x8r8g8b8;
	break;
    case QImage::Format_Indexed8: // XXX not quite
	pixman_format = PIXMAN_a8;
	break;
#ifdef WORDS_BIGENDIAN
    case QImage::Format_Mono:
#else
    case QImage::Format_MonoLSB:
#endif
	pixman_format = PIXMAN_a1;
	break;

    case QImage::Format_Invalid:
#ifdef WORDS_BIGENDIAN
    case QImage::Format_MonoLSB:
#else
    case QImage::Format_Mono:
#endif
    case QImage::Format_ARGB32:
    case QImage::Format_RGB16:
    case QImage::Format_ARGB8565_Premultiplied:
    case QImage::Format_RGB666:
    case QImage::Format_ARGB6666_Premultiplied:
    case QImage::Format_RGB555:
    case QImage::Format_ARGB8555_Premultiplied:
    case QImage::Format_RGB888:
    case QImage::Format_RGB444:
    case QImage::Format_ARGB4444_Premultiplied:
    case QImage::NImageFormats:
    default:
	delete qimg;
	return _cairo_surface_create_in_error (CAIRO_STATUS_INVALID_FORMAT);
    }

    data = qimg->bits();
    data += extents->y * qimg->bytesPerLine();
    data += extents->x * PIXMAN_FORMAT_BPP (pixman_format) / 8;

    pixman_image = pixman_image_create_bits (pixman_format,
					     extents->width,
					     extents->height,
					     (uint32_t *)data,
					     qimg->bytesPerLine());
    if (pixman_image == NULL) {
	delete qimg;
	return _cairo_surface_create_in_error (CAIRO_STATUS_NO_MEMORY);
    }

    surface = (struct _qimage_surface *) malloc (sizeof(*surface));
    if (unlikely (surface == NULL)) {
	pixman_image_unref (pixman_image);
	delete qimg;
	return _cairo_surface_create_in_error (CAIRO_STATUS_NO_MEMORY);
    }

    _cairo_image_surface_init (&surface->image, pixman_image, pixman_format);
    surface->qimg = qimg;

    cairo_surface_set_device_offset (&surface->image.base,
				     -extents->x, -extents->y);

    return &surface->image.base;
}

static cairo_image_surface_t *
_cairo_qt_surface_map_to_image (void *abstract_surface,
				const cairo_rectangle_int_t *extents)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
    QImage *qimg = NULL;

    D(fprintf(stderr, "q[%p] acquire_dest_image\n", abstract_surface));

    if (qs->image_equiv)
	return _cairo_image_surface_map_to_image (qs->image_equiv,
						  extents);

    QPoint offset;

    if (qs->pixmap) {
        qimg = new QImage(qs->pixmap->toImage());
    } else {
        // Try to figure out what kind of QPaintDevice we have, and
        // how we can grab an image from it
        QPaintDevice *pd = qs->p->device();
	if (!pd)
	    return (cairo_image_surface_t *) _cairo_surface_create_in_error (CAIRO_STATUS_NO_MEMORY);

	QPaintDevice *rpd = QPainter::redirected(pd, &offset);
	if (rpd)
	    pd = rpd;

        if (pd->devType() == QInternal::Image) {
            qimg = new QImage(((QImage*) pd)->copy());
        } else if (pd->devType() == QInternal::Pixmap) {
            qimg = new QImage(((QPixmap*) pd)->toImage());
        } else if (pd->devType() == QInternal::Widget) {
            qimg = new QImage(QPixmap::grabWindow(((QWidget*)pd)->winId()).toImage());
        }
    }

    return (cairo_image_surface_t *) map_qimage_to_image (qimg, extents);
}

static cairo_int_status_t
_cairo_qt_surface_unmap_image (void *abstract_surface,
			       cairo_image_surface_t *image)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    D(fprintf(stderr, "q[%p] release_dest_image\n", abstract_surface));

    if (!qs->image_equiv) {
	struct _qimage_surface  *qimage = (struct _qimage_surface  *)image;

        // XXX should I be using setBackgroundMode here instead of setCompositionMode?
        if (qs->supports_porter_duff)
            qs->p->setCompositionMode (QPainter::CompositionMode_Source);

        qs->p->drawImage ((int)qimage->image.base.device_transform.x0,
			  (int)qimage->image.base.device_transform.y0,
			  *qimage->qimg,
			  (int)qimage->image.base.device_transform.x0,
			  (int)qimage->image.base.device_transform.y0,
			  (int)qimage->image.width,
			  (int)qimage->image.height);

        if (qs->supports_porter_duff)
            qs->p->setCompositionMode (QPainter::CompositionMode_SourceOver);

	delete qimage->qimg;
    }

    cairo_surface_finish (&image->base);
    cairo_surface_destroy (&image->base);

    return CAIRO_INT_STATUS_SUCCESS;
}

static cairo_bool_t
_cairo_qt_surface_get_extents (void *abstract_surface,
			       cairo_rectangle_int_t *extents)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    extents->x = qs->window.x();
    extents->y = qs->window.y();
    extents->width  = qs->window.width();
    extents->height = qs->window.height();

    return TRUE;
}

static cairo_status_t
_cairo_qt_surface_clipper_intersect_clip_path (cairo_surface_clipper_t *clipper,
					       cairo_path_fixed_t *path,
					       cairo_fill_rule_t fill_rule,
					       double tolerance,
					       cairo_antialias_t antialias)
{
    cairo_qt_surface_t *qs = cairo_container_of (clipper,
						 cairo_qt_surface_t,
						 clipper);

    if (path == NULL) {
        if (qs->pixmap || qs->image) {
            // we own p
            qs->p->setClipping (false);
        } else {
            qs->p->restore ();
            qs->p->save ();
        }
    } else {
	// XXX Antialiasing is ignored
	qs->p->setClipPath (path_to_qt (path, fill_rule), Qt::IntersectClip);
    }

    return CAIRO_STATUS_SUCCESS;
}

static void
_cairo_qt_surface_set_clip_region (cairo_qt_surface_t *qs,
				   const cairo_region_t *clip_region)
{
    _cairo_surface_clipper_reset (&qs->clipper);

    if (clip_region == NULL) {
        // How the clip path is reset depends on whether we own p or not
        if (qs->pixmap || qs->image) {
            // we own p
            qs->p->setClipping (false);
        } else {
            qs->p->restore ();
            qs->p->save ();
        }
    } else {
	QRegion qr;
	int num_rects = cairo_region_num_rectangles (clip_region);
	for (int i = 0; i < num_rects; ++i) {
	    cairo_rectangle_int_t rect;

	    cairo_region_get_rectangle (clip_region, i, &rect);

	    QRect r(rect.x, rect.y, rect.width, rect.height);
	    qr = qr.unite(r);
	}

	qs->p->setClipRegion (qr, Qt::IntersectClip);
    }
}

static cairo_int_status_t
_cairo_qt_surface_set_clip (cairo_qt_surface_t *qs,
			    const cairo_clip_t *clip)
{
    cairo_int_status_t status;

    D(fprintf(stderr, "q[%p] intersect_clip_path %s\n", abstract_surface, path ? "(path)" : "(clear)"));

    if (clip == NULL) {
	_cairo_surface_clipper_reset (&qs->clipper);
        // How the clip path is reset depends on whether we own p or not
        if (qs->pixmap || qs->image) {
            // we own p
            qs->p->setClipping (false);
        } else {
            qs->p->restore ();
            qs->p->save ();
        }

        return CAIRO_INT_STATUS_SUCCESS;
    }

#if ENABLE_FAST_CLIP
    // Qt will implicitly enable clipping, and will use ReplaceClip
    // instead of IntersectClip if clipping was disabled before

    // Note: Qt is really bad at dealing with clip paths.  It doesn't
    // seem to usefully recognize rectangular paths, instead going down
    // extremely slow paths whenever a clip path is set.  So,
    // we do a bunch of work here to try to get rectangles or regions
    // down to Qt for clipping.

    cairo_region_t *clip_region = NULL;

    status = _cairo_clip_get_region (clip, &clip_region);
    if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
	// We weren't able to extract a region from the traps.
	// Just hand the path down to QPainter.
	status = (cairo_int_status_t)
	    _cairo_surface_clipper_set_clip (&qs->clipper, clip);
    } else if (status == CAIRO_INT_STATUS_SUCCESS) {
	_cairo_qt_surface_set_clip_region (qs, clip_region);
	status = CAIRO_INT_STATUS_SUCCESS;
    }
#else
    status = (cairo_int_status_t)
	_cairo_surface_clipper_set_clip (&qs->clipper, clip);
#endif

    return status;
}

/*
 * Brush conversion
 */

struct PatternToBrushConverter {
    PatternToBrushConverter (const cairo_pattern_t *pattern) :
	mAcquiredImageParent(0),
	mAcquiredImage(0),
	mAcquiredImageExtra(0)
    {
	if (pattern->type == CAIRO_PATTERN_TYPE_SOLID) {
	    cairo_solid_pattern_t *solid = (cairo_solid_pattern_t*) pattern;
	    QColor color;
	    color.setRgbF(solid->color.red,
			  solid->color.green,
			  solid->color.blue,
			  solid->color.alpha);

	    mBrush = QBrush(color);
	} else if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE) {
	    cairo_surface_pattern_t *spattern = (cairo_surface_pattern_t*) pattern;
	    cairo_surface_t *surface = spattern->surface;

	    if (surface->type == CAIRO_SURFACE_TYPE_QT) {
		cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;

		if (qs->image) {
		    mBrush = QBrush(*qs->image);
		} else if (qs->pixmap) {
		    mBrush = QBrush(*qs->pixmap);
		} else {
		    // do something smart
		    mBrush = QBrush(0xff0000ff);
		}
	    } else {
		cairo_image_surface_t *isurf = NULL;

		if (surface->type == CAIRO_SURFACE_TYPE_IMAGE) {
		    isurf = (cairo_image_surface_t*) surface;
		} else {
		    void *image_extra;

		    if (_cairo_surface_acquire_source_image (surface, &isurf, &image_extra) == CAIRO_STATUS_SUCCESS) {
			mAcquiredImageParent = surface;
			mAcquiredImage = isurf;
			mAcquiredImageExtra = image_extra;
		    } else {
			isurf = NULL;
		    }
		}

		if (isurf) {
		    mBrush = QBrush (QImage ((const uchar *) isurf->data,
						 isurf->width,
						 isurf->height,
						 isurf->stride,
						 _qimage_format_from_cairo_format (isurf->format)));
		} else {
		    mBrush = QBrush(0x0000ffff);
		}
	    }
	} else if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR ||
		   pattern->type == CAIRO_PATTERN_TYPE_RADIAL)
	{
	    QGradient *grad;
	    cairo_bool_t reverse_stops = FALSE;
	    cairo_bool_t emulate_reflect = FALSE;
	    double offset = 0.0;

	    cairo_extend_t extend = pattern->extend;

	    cairo_gradient_pattern_t *gpat = (cairo_gradient_pattern_t *) pattern;

	    if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR) {
		cairo_linear_pattern_t *lpat = (cairo_linear_pattern_t *) pattern;
		grad = new QLinearGradient (lpat->pd1.x, lpat->pd1.y,
					    lpat->pd2.x, lpat->pd2.y);
	    } else if (pattern->type == CAIRO_PATTERN_TYPE_RADIAL) {
		cairo_radial_pattern_t *rpat = (cairo_radial_pattern_t *) pattern;

		/* Based on the SVG surface code */

		cairo_circle_double_t *c0, *c1;
		double x0, y0, r0, x1, y1, r1;

		if (rpat->cd1.radius < rpat->cd2.radius) {
		    c0 = &rpat->cd1;
		    c1 = &rpat->cd2;
		    reverse_stops = FALSE;
		} else {
		    c0 = &rpat->cd2;
		    c1 = &rpat->cd1;
		    reverse_stops = TRUE;
		}

		x0 = c0->center.x;
		y0 = c0->center.y;
		r0 = c0->radius;
		x1 = c1->center.x;
		y1 = c1->center.y;
		r1 = c1->radius;

		if (r0 == r1) {
		    grad = new QRadialGradient (x1, y1, r1, x1, y1);
		} else {
		    double fx = (r1 * x0 - r0 * x1) / (r1 - r0);
		    double fy = (r1 * y0 - r0 * y1) / (r1 - r0);

		    /* QPainter doesn't support the inner circle and use instead a gradient focal.
		     * That means we need to emulate the cairo behaviour by processing the
		     * cairo gradient stops.
		     * The CAIRO_EXTENT_NONE and CAIRO_EXTENT_PAD modes are quite easy to handle,
		     * it's just a matter of stop position translation and calculation of
		     * the corresponding SVG radial gradient focal.
		     * The CAIRO_EXTENT_REFLECT and CAIRO_EXTEND_REPEAT modes require to compute a new
		     * radial gradient, with an new outer circle, equal to r1 - r0 in the CAIRO_EXTEND_REPEAT
		     * case, and 2 * (r1 - r0) in the CAIRO_EXTENT_REFLECT case, and a new gradient stop
		     * list that maps to the original cairo stop list.
		     */
		    if ((extend == CAIRO_EXTEND_REFLECT || extend == CAIRO_EXTEND_REPEAT) && r0 > 0.0) {
			double r_org = r1;
			double r, x, y;

			if (extend == CAIRO_EXTEND_REFLECT) {
			    r1 = 2 * r1 - r0;
			    emulate_reflect = TRUE;
			}

			offset = fmod (r1, r1 - r0) / (r1 - r0) - 1.0;
			r = r1 - r0;

			/* New position of outer circle. */
			x = r * (x1 - fx) / r_org + fx;
			y = r * (y1 - fy) / r_org + fy;

			x1 = x;
			y1 = y;
			r1 = r;
			r0 = 0.0;
		    } else {
			offset = r0 / r1;
		    }

		    grad = new QRadialGradient (x1, y1, r1, fx, fy);

		    if (extend == CAIRO_EXTEND_NONE && r0 != 0.0)
			grad->setColorAt (r0 / r1, Qt::transparent);
		}
	    }

	    switch (extend) {
		case CAIRO_EXTEND_NONE:
		case CAIRO_EXTEND_PAD:
		    grad->setSpread(QGradient::PadSpread);

		    grad->setColorAt (0.0, Qt::transparent);
		    grad->setColorAt (1.0, Qt::transparent);
		    break;

		case CAIRO_EXTEND_REFLECT:
		    grad->setSpread(QGradient::ReflectSpread);
		    break;

		case CAIRO_EXTEND_REPEAT:
		    grad->setSpread(QGradient::RepeatSpread);
		    break;
	    }

	    for (unsigned int i = 0; i < gpat->n_stops; i++) {
		int index = i;
		if (reverse_stops)
		    index = gpat->n_stops - i - 1;

		double offset = gpat->stops[i].offset;
		QColor color;
		color.setRgbF (gpat->stops[i].color.red,
			       gpat->stops[i].color.green,
			       gpat->stops[i].color.blue,
			       gpat->stops[i].color.alpha);

		if (emulate_reflect) {
		    offset = offset / 2.0;
		    grad->setColorAt (1.0 - offset, color);
		}

		grad->setColorAt (offset, color);
	    }

	    mBrush = QBrush(*grad);

	    delete grad;
	}

	if (mBrush.style() != Qt::NoBrush  &&
            pattern->type != CAIRO_PATTERN_TYPE_SOLID &&
            ! _cairo_matrix_is_identity (&pattern->matrix))
	{
	    cairo_matrix_t pm = pattern->matrix;
	    cairo_status_t status = cairo_matrix_invert (&pm);
	    assert (status == CAIRO_STATUS_SUCCESS);
	    mBrush.setMatrix (_qmatrix_from_cairo_matrix (pm));
	}
    }

    ~PatternToBrushConverter () {
	if (mAcquiredImageParent)
	    _cairo_surface_release_source_image (mAcquiredImageParent, mAcquiredImage, mAcquiredImageExtra);
    }

    operator QBrush& () {
	return mBrush;
    }

    QBrush mBrush;

    private:
    cairo_surface_t *mAcquiredImageParent;
    cairo_image_surface_t *mAcquiredImage;
    void *mAcquiredImageExtra;
};

struct PatternToPenConverter {
    PatternToPenConverter (const cairo_pattern_t *source,
                           const cairo_stroke_style_t *style) :
        mBrushConverter(source)
    {
        Qt::PenJoinStyle join = Qt::MiterJoin;
        Qt::PenCapStyle cap = Qt::SquareCap;

        switch (style->line_cap) {
        case CAIRO_LINE_CAP_BUTT:
            cap = Qt::FlatCap;
            break;
        case CAIRO_LINE_CAP_ROUND:
            cap = Qt::RoundCap;
            break;
        case CAIRO_LINE_CAP_SQUARE:
            cap = Qt::SquareCap;
            break;
        }

        switch (style->line_join) {
        case CAIRO_LINE_JOIN_MITER:
            join = Qt::MiterJoin;
            break;
        case CAIRO_LINE_JOIN_ROUND:
            join = Qt::RoundJoin;
            break;
        case CAIRO_LINE_JOIN_BEVEL:
            join = Qt::BevelJoin;
            break;
        }

        mPen = QPen(mBrushConverter, style->line_width, Qt::SolidLine, cap, join);
        mPen.setMiterLimit (style->miter_limit);

        if (style->dash && style->num_dashes) {
            Qt::PenStyle pstyle = Qt::NoPen;

            if (style->num_dashes == 2) {
                if ((style->dash[0] == style->line_width &&
                        style->dash[1] == style->line_width && style->line_width <= 2.0) ||
                    (style->dash[0] == 0.0 &&
                        style->dash[1] == style->line_width * 2 && cap == Qt::RoundCap))
                {
                    pstyle = Qt::DotLine;
                } else if (style->dash[0] == style->line_width * DASH_LENGTH &&
                           style->dash[1] == style->line_width * DASH_LENGTH &&
                           cap == Qt::FlatCap)
                {
                    pstyle = Qt::DashLine;
                }
            }

            if (pstyle != Qt::NoPen) {
                mPen.setStyle(pstyle);
                return;
            }

            unsigned int odd_dash = style->num_dashes % 2;

            QVector<qreal> dashes (odd_dash ? style->num_dashes * 2 : style->num_dashes);
            for (unsigned int i = 0; i < odd_dash+1; i++) {
                for (unsigned int j = 0; j < style->num_dashes; j++) {
                    // In Qt, the dash lengths are given in units of line width, whereas
                    // in cairo, they are in user-space units.  We'll always apply the CTM,
                    // so all we have to do here is divide cairo's dash lengths by the line
                    // width.
                    dashes.append (style->dash[j] / style->line_width);
                }
            }

            mPen.setDashPattern(dashes);
            mPen.setDashOffset(style->dash_offset / style->line_width);
        }
    }

    ~PatternToPenConverter() { }

    operator QPen& () {
        return mPen;
    }

    QPen mPen;
    PatternToBrushConverter mBrushConverter;
};

/*
 * Core drawing operations
 */

static bool
_cairo_qt_fast_fill (cairo_qt_surface_t *qs,
		     const cairo_pattern_t *source,
		     const cairo_path_fixed_t *path = NULL,
		     cairo_fill_rule_t fill_rule = CAIRO_FILL_RULE_WINDING,
		     double tolerance = 0.0,
		     cairo_antialias_t antialias = CAIRO_ANTIALIAS_NONE)
{
#if ENABLE_FAST_FILL
    QImage *qsSrc_image = NULL;
    QPixmap *qsSrc_pixmap = NULL;
    std::auto_ptr<QImage> qsSrc_image_d;


    if (source->type == CAIRO_PATTERN_TYPE_SURFACE) {
	cairo_surface_pattern_t *spattern = (cairo_surface_pattern_t*) source;
	if (spattern->surface->type == CAIRO_SURFACE_TYPE_QT) {
	    cairo_qt_surface_t *p = (cairo_qt_surface_t*) spattern->surface;

	    qsSrc_image = p->image;
	    qsSrc_pixmap = p->pixmap;
	} else if (spattern->surface->type == CAIRO_SURFACE_TYPE_IMAGE) {
	    cairo_image_surface_t *p = (cairo_image_surface_t*) spattern->surface;
	    qsSrc_image = new QImage((const uchar*) p->data,
				     p->width,
				     p->height,
				     p->stride,
				     _qimage_format_from_cairo_format(p->format));
	    qsSrc_image_d.reset(qsSrc_image);
	}
    }

    if (!qsSrc_image && !qsSrc_pixmap)
	return false;

    // We can only drawTiledPixmap; there's no drawTiledImage
    if (! qsSrc_pixmap &&
	(source->extend == CAIRO_EXTEND_REPEAT ||
	 source->extend == CAIRO_EXTEND_REFLECT))
    {
	return false;
    }

    QMatrix sourceMatrix = _qmatrix_from_cairo_matrix (source->matrix);

    // We can draw this faster by clipping and calling drawImage/drawPixmap.
    // Use our own clipping function so that we can get the
    // region handling to end up with the fastest possible clip.
    //
    // XXX Antialiasing will fail pretty hard here, since we can't clip with AA
    // with QPainter.
    qs->p->save();

    if (path) {
	cairo_int_status_t status;

	cairo_clip_t clip, old_clip = qs->clipper.clip;

	_cairo_clip_init_copy (&clip, &qs->clipper.clip);
	status = (cairo_int_status_t) _cairo_clip_clip (&clip,
							path,
							fill_rule,
							tolerance,
							antialias);
	if (unlikely (status)) {
	    qs->p->restore();
	    return false;
	}

	status = _cairo_qt_surface_set_clip (qs, &clip);
	if (unlikely (status)) {
	    qs->p->restore();
	    return false;
	}

	_cairo_clip_reset (&clip);
	qs->clipper.clip = old_clip;
    }

    qs->p->setWorldMatrix (sourceMatrix.inverted(), true);

    switch (source->extend) {
    case CAIRO_EXTEND_REPEAT:
    // XXX handle reflect by tiling 4 times first
    case CAIRO_EXTEND_REFLECT: {
            assert (qsSrc_pixmap);

            // Render the tiling to cover the entire destination window (because
            // it'll be clipped).  Transform the window rect by the inverse
            // of the current world transform so that the device coordinates
            // end up as the right thing.
            QRectF dest = qs->p->worldTransform().inverted().mapRect(QRectF(qs->window));
            QPointF origin = sourceMatrix.map(QPointF(0.0, 0.0));

            qs->p->drawTiledPixmap (dest, *qsSrc_pixmap, origin);
        }
        break;
    case CAIRO_EXTEND_NONE:
    case CAIRO_EXTEND_PAD: // XXX not exactly right, but good enough
    default:
        if (qsSrc_image)
            qs->p->drawImage (0, 0, *qsSrc_image);
        else if (qsSrc_pixmap)
            qs->p->drawPixmap (0, 0, *qsSrc_pixmap);
        break;
    }

    qs->p->restore();

    return true;
#else
    return false;
#endif
}

static cairo_int_status_t
_cairo_qt_surface_paint (void *abstract_surface,
			 cairo_operator_t op,
			 const cairo_pattern_t *source,
			 const cairo_clip_t	       *clip)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
    cairo_int_status_t status;

    D(fprintf(stderr, "q[%p] paint op:%s\n", abstract_surface, _opstr(op)));

    if (! _op_is_supported (qs, op))
	return _cairo_surface_fallback_paint (abstract_surface, op, source, clip);

    status = _cairo_qt_surface_set_clip (qs, clip);
    if (unlikely (status))
	return status;

    if (qs->supports_porter_duff)
        qs->p->setCompositionMode (_qpainter_compositionmode_from_cairo_op (op));

    if (! _cairo_qt_fast_fill (qs, source)) {
	PatternToBrushConverter brush (source);
        qs->p->fillRect (qs->window, brush);
    }

    if (qs->supports_porter_duff)
        qs->p->setCompositionMode (QPainter::CompositionMode_SourceOver);

    return CAIRO_INT_STATUS_SUCCESS;
}

static cairo_int_status_t
_cairo_qt_surface_fill (void *abstract_surface,
			cairo_operator_t op,
			const cairo_pattern_t *source,
			const cairo_path_fixed_t *path,
			cairo_fill_rule_t fill_rule,
			double tolerance,
			cairo_antialias_t antialias,
			const cairo_clip_t *clip)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    D(fprintf(stderr, "q[%p] fill op:%s\n", abstract_surface, _opstr(op)));

    if (! _op_is_supported (qs, op))
	return _cairo_surface_fallback_fill (abstract_surface, op,
					     source, path, fill_rule,
					     tolerance, antialias, clip);

    cairo_int_status_t status = _cairo_qt_surface_set_clip (qs, clip);
    if (unlikely (status))
	return status;

    if (qs->supports_porter_duff)
        qs->p->setCompositionMode (_qpainter_compositionmode_from_cairo_op (op));

    // XXX Qt4.3, 4.4 misrenders some complex paths if antialiasing is
    // enabled
    //qs->p->setRenderHint (QPainter::Antialiasing, antialias == CAIRO_ANTIALIAS_NONE ? false : true);
    qs->p->setRenderHint (QPainter::SmoothPixmapTransform, source->filter != CAIRO_FILTER_FAST);

    if (! _cairo_qt_fast_fill (qs, source,
			       path, fill_rule, tolerance, antialias))
    {
	PatternToBrushConverter brush(source);
	qs->p->fillPath (path_to_qt (path, fill_rule), brush);
    }

    if (qs->supports_porter_duff)
        qs->p->setCompositionMode (QPainter::CompositionMode_SourceOver);

    return CAIRO_INT_STATUS_SUCCESS;
}

static cairo_int_status_t
_cairo_qt_surface_stroke (void *abstract_surface,
			  cairo_operator_t op,
			  const cairo_pattern_t *source,
			  const cairo_path_fixed_t *path,
			  const cairo_stroke_style_t *style,
			  const cairo_matrix_t *ctm,
			  const cairo_matrix_t *ctm_inverse,
			  double tolerance,
			  cairo_antialias_t antialias,
			  const cairo_clip_t *clip)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    D(fprintf(stderr, "q[%p] stroke op:%s\n", abstract_surface, _opstr(op)));

    if (! _op_is_supported (qs, op))
	return _cairo_surface_fallback_stroke (abstract_surface, op,
					       source, path, style, ctm,
					       ctm_inverse, tolerance,
					       antialias, clip);

    cairo_int_status_t int_status = _cairo_qt_surface_set_clip (qs, clip);
    if (unlikely (int_status))
	return int_status;

    QMatrix savedMatrix = qs->p->worldMatrix();

    if (qs->supports_porter_duff)
        qs->p->setCompositionMode (_qpainter_compositionmode_from_cairo_op (op));

    qs->p->setWorldMatrix (_qmatrix_from_cairo_matrix (*ctm), true);
    // XXX Qt4.3, 4.4 misrenders some complex paths if antialiasing is
    // enabled
    //qs->p->setRenderHint (QPainter::Antialiasing, antialias == CAIRO_ANTIALIAS_NONE ? false : true);
    qs->p->setRenderHint (QPainter::SmoothPixmapTransform, source->filter != CAIRO_FILTER_FAST);

    PatternToPenConverter pen(source, style);

    qs->p->setPen(pen);
    qs->p->drawPath(path_to_qt (path, ctm_inverse));
    qs->p->setPen(Qt::black);

    qs->p->setWorldMatrix (savedMatrix, false);

    if (qs->supports_porter_duff)
        qs->p->setCompositionMode (QPainter::CompositionMode_SourceOver);

    return CAIRO_INT_STATUS_SUCCESS;
}

static cairo_int_status_t
_cairo_qt_surface_show_glyphs (void *abstract_surface,
			       cairo_operator_t op,
			       const cairo_pattern_t *source,
			       cairo_glyph_t *glyphs,
			       int num_glyphs,
			       cairo_scaled_font_t *scaled_font,
			       const cairo_clip_t *clip)
{
#if ((QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)) || defined(QT_GLYPHS_API_BACKPORT)) && 0
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    // pick out the colour to use from the cairo source
    cairo_solid_pattern_t *solid = (cairo_solid_pattern_t*) source;
    cairo_scaled_glyph_t* glyph;
    // documentation says you have to freeze the cache, but I don't believe it
    _cairo_scaled_font_freeze_cache(scaled_font);

    QColor tempColour(solid->color.red * 255, solid->color.green * 255, solid->color.blue * 255);
    QVarLengthArray<QPointF> positions(num_glyphs);
    QVarLengthArray<unsigned int> glyphss(num_glyphs);
    FT_Face face = cairo_ft_scaled_font_lock_face (scaled_font);
    const FT_Size_Metrics& ftMetrics = face->size->metrics;
    QFont font(face->family_name);
    font.setStyleStrategy(QFont::NoFontMerging);
    font.setBold(face->style_flags & FT_STYLE_FLAG_BOLD);
    font.setItalic(face->style_flags & FT_STYLE_FLAG_ITALIC);
    font.setKerning(face->face_flags & FT_FACE_FLAG_KERNING);
    font.setPixelSize(ftMetrics.y_ppem);
    cairo_ft_scaled_font_unlock_face(scaled_font);
    qs->p->setFont(font);
    qs->p->setPen(tempColour);
    for (int currentGlyph = 0; currentGlyph < num_glyphs; currentGlyph++) {
        positions[currentGlyph].setX(glyphs[currentGlyph].x);
        positions[currentGlyph].setY(glyphs[currentGlyph].y);
        glyphss[currentGlyph] = glyphs[currentGlyph].index;
    }
    qt_draw_glyphs(qs->p, glyphss.data(), positions.data(), num_glyphs);
    _cairo_scaled_font_thaw_cache(scaled_font);
    return CAIRO_INT_STATUS_SUCCESS;
#else
    return _cairo_surface_fallback_glyphs (abstract_surface, op,
					   source, glyphs, num_glyphs,
					   scaled_font, clip);
#endif
}

static cairo_int_status_t
_cairo_qt_surface_mask (void *abstract_surface,
			cairo_operator_t op,
			const cairo_pattern_t *source,
			const cairo_pattern_t *mask,
			const cairo_clip_t	    *clip)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    D(fprintf(stderr, "q[%p] mask op:%s\n", abstract_surface, _opstr(op)));

    if (qs->p && mask->type == CAIRO_PATTERN_TYPE_SOLID) {
        cairo_solid_pattern_t *solid_mask = (cairo_solid_pattern_t *) mask;
        cairo_int_status_t result;

        qs->p->setOpacity (solid_mask->color.alpha);

        result = _cairo_qt_surface_paint (abstract_surface, op, source, clip);

        qs->p->setOpacity (1.0);

        return result;
    }

    // otherwise skip for now
    return _cairo_surface_fallback_mask (abstract_surface, op, source, mask, clip);
}

static cairo_status_t
_cairo_qt_surface_mark_dirty (void *abstract_surface,
			      int x, int y,
			      int width, int height)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;

    if (qs->p && !(qs->image || qs->pixmap))
	qs->p->save ();

    return CAIRO_STATUS_SUCCESS;
}

/*
 * Backend struct
 */

static const cairo_surface_backend_t cairo_qt_surface_backend = {
    CAIRO_SURFACE_TYPE_QT,
    _cairo_qt_surface_finish,

    _cairo_default_context_create, /* XXX */

    _cairo_qt_surface_create_similar,
    NULL, /* similar image */
    _cairo_qt_surface_map_to_image,
    _cairo_qt_surface_unmap_image,

    _cairo_surface_default_source,
    _cairo_qt_surface_acquire_source_image,
    _cairo_qt_surface_release_source_image,
    NULL, /* snapshot */

    NULL, /* copy_page */
    NULL, /* show_page */

    _cairo_qt_surface_get_extents,
    NULL, /* get_font_options */

    NULL, /* flush */
    _cairo_qt_surface_mark_dirty,

    _cairo_qt_surface_paint,
    _cairo_qt_surface_mask,
    _cairo_qt_surface_stroke,
    _cairo_qt_surface_fill,
    NULL, /* fill_stroke */
    _cairo_qt_surface_show_glyphs
};

cairo_surface_t *
cairo_qt_surface_create (QPainter *painter)
{
    cairo_qt_surface_t *qs;

    qs = (cairo_qt_surface_t *) malloc (sizeof(cairo_qt_surface_t));
    if (qs == NULL)
        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));

    memset (qs, 0, sizeof(cairo_qt_surface_t));

    _cairo_surface_init (&qs->base,
			 &cairo_qt_surface_backend,
			 NULL, /* device */
			 CAIRO_CONTENT_COLOR_ALPHA);

    _cairo_surface_clipper_init (&qs->clipper,
				 _cairo_qt_surface_clipper_intersect_clip_path);

    qs->p = painter;
    if (qs->p->paintEngine())
        qs->supports_porter_duff = qs->p->paintEngine()->hasFeature(QPaintEngine::PorterDuff);
    else
        qs->supports_porter_duff = FALSE;

    // Save so that we can always get back to the original state
    qs->p->save();

    qs->window = painter->window();

    D(fprintf(stderr, "qpainter_surface_create: window: [%d %d %d %d] pd:%d\n",
              qs->window.x(), qs->window.y(), qs->window.width(), qs->window.height(),
              qs->supports_porter_duff));

    return &qs->base;
}

cairo_surface_t *
cairo_qt_surface_create_with_qimage (cairo_format_t format,
				     int width,
				     int height)
{
    cairo_qt_surface_t *qs;

    qs = (cairo_qt_surface_t *) malloc (sizeof(cairo_qt_surface_t));
    if (qs == NULL)
        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));

    memset (qs, 0, sizeof(cairo_qt_surface_t));

    _cairo_surface_init (&qs->base,
			 &cairo_qt_surface_backend,
			 NULL, /* device */
			 _cairo_content_from_format (format));

    _cairo_surface_clipper_init (&qs->clipper,
				 _cairo_qt_surface_clipper_intersect_clip_path);


    QImage *image = new QImage (width, height,
				_qimage_format_from_cairo_format (format));

    qs->image = image;

    if (!image->isNull()) {
        qs->p = new QPainter(image);
        qs->supports_porter_duff = qs->p->paintEngine()->hasFeature(QPaintEngine::PorterDuff);
    }

    qs->image_equiv = cairo_image_surface_create_for_data (image->bits(),
                                                           format,
                                                           width, height,
                                                           image->bytesPerLine());

    qs->window = QRect(0, 0, width, height);

    D(fprintf(stderr, "qpainter_surface_create: qimage: [%d %d %d %d] pd:%d\n",
              qs->window.x(), qs->window.y(), qs->window.width(), qs->window.height(),
              qs->supports_porter_duff));

    return &qs->base;
}

cairo_surface_t *
cairo_qt_surface_create_with_qpixmap (cairo_content_t content,
				      int width,
				      int height)
{
    cairo_qt_surface_t *qs;

    if ((content & CAIRO_CONTENT_COLOR) == 0)
	return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_CONTENT));

    qs = (cairo_qt_surface_t *) malloc (sizeof(cairo_qt_surface_t));
    if (qs == NULL)
        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));

    memset (qs, 0, sizeof(cairo_qt_surface_t));

    QPixmap *pixmap = new QPixmap (width, height);
    if (pixmap == NULL) {
	free (qs);
        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
    }

    // By default, a QPixmap is opaque; however, if it's filled
    // with a color with a transparency component, it is converted
    // to a format that preserves transparency.
    if (content == CAIRO_CONTENT_COLOR_ALPHA)
	pixmap->fill(Qt::transparent);

    _cairo_surface_init (&qs->base,
			 &cairo_qt_surface_backend,
			 NULL, /* device */
			 content);

    _cairo_surface_clipper_init (&qs->clipper,
				 _cairo_qt_surface_clipper_intersect_clip_path);

    qs->pixmap = pixmap;

    if (!pixmap->isNull()) {
        qs->p = new QPainter(pixmap);
        qs->supports_porter_duff = qs->p->paintEngine()->hasFeature(QPaintEngine::PorterDuff);
    }

    qs->window = QRect(0, 0, width, height);

    D(fprintf(stderr, "qpainter_surface_create: qpixmap: [%d %d %d %d] pd:%d\n",
              qs->window.x(), qs->window.y(), qs->window.width(), qs->window.height(),
              qs->supports_porter_duff));

    return &qs->base;
}

QPainter *
cairo_qt_surface_get_qpainter (cairo_surface_t *surface)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;

    if (surface->type != CAIRO_SURFACE_TYPE_QT)
        return NULL;

    return qs->p;
}

QImage *
cairo_qt_surface_get_qimage (cairo_surface_t *surface)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;

    if (surface->type != CAIRO_SURFACE_TYPE_QT)
        return NULL;

    return qs->image;
}

cairo_surface_t *
cairo_qt_surface_get_image (cairo_surface_t *surface)
{
    cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;

    if (surface->type != CAIRO_SURFACE_TYPE_QT)
        return NULL;

    return qs->image_equiv;
}

/*
 * TODO:
 *
 * - Figure out why QBrush isn't working with non-repeated images
 *
 * - Correct repeat mode; right now, every surface source is EXTEND_REPEAT
 *   - implement EXTEND_NONE (?? probably need to clip to the extents of the source)
 *   - implement EXTEND_REFLECT (create temporary and copy 4x, then EXTEND_REPEAT that)
 *
 * - stroke-image failure
 *
 * - Implement mask() with non-solid masks (probably will need to use a temporary and use IN)
 *
 * - Implement gradient sources
 *
 * - Make create_similar smarter -- create QPixmaps in more circumstances
 *   (e.g. if the pixmap can have alpha)
 *
 * - Implement show_glyphs() in terms of Qt
 *
 */