summaryrefslogtreecommitdiff
path: root/src/cairo-win32-font.c
blob: 385297ee2b477784096e999f9a40548778548ff6 (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
/* cairo - a vector graphics library with display and print output
 *
 * Copyright © 2005 Red Hat, Inc
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 Red Hat, Inc.
 *
 * Contributor(s):
 */

#include <string.h>
#include <stdio.h>
#include "cairoint.h"
#include "cairo-win32-private.h"

#ifndef SPI_GETFONTSMOOTHINGTYPE 
#define SPI_GETFONTSMOOTHINGTYPE 0x200a
#endif
#ifndef FE_FONTSMOOTHINGCLEARTYPE
#define FE_FONTSMOOTHINGCLEARTYPE 2
#endif
#ifndef CLEARTYPE_QUALITY
#define CLEARTYPE_QUALITY 5
#endif

const cairo_scaled_font_backend_t cairo_win32_scaled_font_backend;

#define LOGICAL_SCALE 32

typedef struct {
    cairo_scaled_font_t base;

    LOGFONTW logfont;

    BYTE quality;

    /* We do drawing and metrics computation in a "logical space" which
     * is similar to font space, except that it is scaled by a factor
     * of the (desired font size) * (LOGICAL_SCALE). The multiplication
     * by LOGICAL_SCALE allows for sub-pixel precision.
     */
    double logical_scale;

    /* The size we should actually request the font at from Windows; differs
     * from the logical_scale because it is quantized for orthogonal
     * transformations
     */
    double logical_size;

    /* Transformations from device <=> logical space
     */
    cairo_matrix_t logical_to_device;
    cairo_matrix_t device_to_logical;

    /* We special case combinations of 90-degree-rotations, scales and
     * flips ... that is transformations that take the axes to the
     * axes. If preserve_axes is true, then swap_axes/swap_x/swap_y
     * encode the 8 possibilities for orientation (4 rotation angles with
     * and without a flip), and scale_x, scale_y the scale components.
     */
    cairo_bool_t preserve_axes;
    cairo_bool_t swap_axes;
    cairo_bool_t swap_x;
    cairo_bool_t swap_y;
    double x_scale;
    double y_scale;
  
    /* The size of the design unit of the font
     */
    int em_square;

    HFONT scaled_hfont;
    HFONT unscaled_hfont;
    
} cairo_win32_scaled_font_t;

#define NEARLY_ZERO(d) (fabs(d) < (1. / 65536.))

static void
_compute_transform (cairo_win32_scaled_font_t *scaled_font,
		    cairo_matrix_t            *sc)
{
    cairo_status_t status;

    if (NEARLY_ZERO (sc->yx) && NEARLY_ZERO (sc->xy)) {
	scaled_font->preserve_axes = TRUE;
	scaled_font->x_scale = sc->xx;
	scaled_font->swap_x = (sc->xx < 0);
	scaled_font->y_scale = sc->yy;
	scaled_font->swap_y = (sc->yy < 0);
	scaled_font->swap_axes = FALSE;
	
    } else if (NEARLY_ZERO (sc->xx) && NEARLY_ZERO (sc->yy)) {
	scaled_font->preserve_axes = TRUE;
	scaled_font->x_scale = sc->yx;
	scaled_font->swap_x = (sc->yx < 0);
	scaled_font->y_scale = sc->xy;
	scaled_font->swap_y = (sc->xy < 0);
	scaled_font->swap_axes = TRUE;

    } else {
	scaled_font->preserve_axes = FALSE;
	scaled_font->swap_x = scaled_font->swap_y = scaled_font->swap_axes = FALSE;
    }

    if (scaled_font->preserve_axes) {
	if (scaled_font->swap_x)
	    scaled_font->x_scale = - scaled_font->x_scale;
	if (scaled_font->swap_y)
	    scaled_font->y_scale = - scaled_font->y_scale;
	
	scaled_font->logical_scale = LOGICAL_SCALE * scaled_font->y_scale;
	scaled_font->logical_size = LOGICAL_SCALE * floor (scaled_font->y_scale + 0.5);
    }

    /* The font matrix has x and y "scale" components which we extract and
     * use as character scale values.
     */
    cairo_matrix_init (&scaled_font->logical_to_device,
		       sc->xx, sc->yx, sc->xy, sc->yy, 0, 0);

    if (!scaled_font->preserve_axes) {
	_cairo_matrix_compute_scale_factors (&scaled_font->logical_to_device,
					     &scaled_font->x_scale, &scaled_font->y_scale,
					     TRUE);	/* XXX: Handle vertical text */

	scaled_font->logical_size = floor (LOGICAL_SCALE * scaled_font->y_scale + 0.5);
	scaled_font->logical_scale = LOGICAL_SCALE * scaled_font->y_scale;
    }

    cairo_matrix_scale (&scaled_font->logical_to_device,
			1.0 / scaled_font->logical_scale, 1.0 / scaled_font->logical_scale);

    scaled_font->device_to_logical = scaled_font->logical_to_device;
    
    status = cairo_matrix_invert (&scaled_font->device_to_logical);
    if (status)
	cairo_matrix_init_identity (&scaled_font->device_to_logical);
}

static BYTE
_get_system_quality (void)
{
    BOOL font_smoothing;

    if (!SystemParametersInfo (SPI_GETFONTSMOOTHING, 0, &font_smoothing, 0)) {
	_cairo_win32_print_gdi_error ("_get_system_quality");
	return FALSE;
    }

    if (font_smoothing) {
	OSVERSIONINFO version_info;

	version_info.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
	
	if (!GetVersionEx (&version_info)) {
	    _cairo_win32_print_gdi_error ("_get_system_quality");
	    return FALSE;
	}

	if (version_info.dwMajorVersion > 5 ||
	    (version_info.dwMajorVersion == 5 &&
	     version_info.dwMinorVersion >= 1))	{ /* XP or newer */
	    UINT smoothing_type;

	    if (!SystemParametersInfo (SPI_GETFONTSMOOTHINGTYPE,
				       0, &smoothing_type, 0)) {
		_cairo_win32_print_gdi_error ("_get_system_quality");
		return FALSE;
	    }

	    if (smoothing_type == FE_FONTSMOOTHINGCLEARTYPE)
		return CLEARTYPE_QUALITY;
	}

	return ANTIALIASED_QUALITY;
    } else {
	return DEFAULT_QUALITY;
    }
}

static cairo_scaled_font_t *
_win32_scaled_font_create (LOGFONTW             *logfont,
			   const cairo_matrix_t *font_matrix,
			   const cairo_matrix_t *ctm)
{
    cairo_win32_scaled_font_t *f;
    cairo_matrix_t scale;

    f = malloc (sizeof(cairo_win32_scaled_font_t));
    if (f == NULL) 
      return NULL;

    f->logfont = *logfont;
    f->quality = _get_system_quality ();
    f->em_square = 0;
    f->scaled_hfont = NULL;
    f->unscaled_hfont = NULL;

    cairo_matrix_multiply (&scale, font_matrix, ctm);
    _compute_transform (f, &scale);

    _cairo_scaled_font_init (&f->base, font_matrix, ctm, &cairo_win32_scaled_font_backend);

    return &f->base;
}

static cairo_status_t
_win32_scaled_font_set_world_transform (cairo_win32_scaled_font_t *scaled_font,
					HDC                        hdc)
{
    XFORM xform;
    
    xform.eM11 = scaled_font->logical_to_device.xx;
    xform.eM21 = scaled_font->logical_to_device.xy;
    xform.eM12 = scaled_font->logical_to_device.yx;
    xform.eM22 = scaled_font->logical_to_device.yy;
    xform.eDx = scaled_font->logical_to_device.x0;
    xform.eDy = scaled_font->logical_to_device.y0;

    if (!SetWorldTransform (hdc, &xform))
	return _cairo_win32_print_gdi_error ("_win32_scaled_font_set_world_transform");

    return CAIRO_STATUS_SUCCESS;
}

static cairo_status_t
_win32_scaled_font_set_identity_transform (HDC hdc)
{
    if (!ModifyWorldTransform (hdc, NULL, MWT_IDENTITY))
	return _cairo_win32_print_gdi_error ("_win32_scaled_font_set_identity_transform");

    return CAIRO_STATUS_SUCCESS;
}

static HDC
_get_global_font_dc (void)
{
    static HDC hdc;

    if (!hdc) {
	hdc = CreateCompatibleDC (NULL);
	if (!hdc) {
	    _cairo_win32_print_gdi_error ("_get_global_font_dc");
	    return NULL;
	}

	if (!SetGraphicsMode (hdc, GM_ADVANCED)) {
	    _cairo_win32_print_gdi_error ("_get_global_font_dc");
	    DeleteDC (hdc);
	    return NULL;
	}
    }

    return hdc;
}

static HFONT
_win32_scaled_font_get_scaled_hfont (cairo_win32_scaled_font_t *scaled_font)
{
    if (!scaled_font->scaled_hfont) {
	LOGFONTW logfont = scaled_font->logfont;
	logfont.lfHeight = scaled_font->logical_size;
	logfont.lfWidth = 0;
	logfont.lfEscapement = 0;
	logfont.lfOrientation = 0;
	logfont.lfQuality = scaled_font->quality;

	scaled_font->scaled_hfont = CreateFontIndirectW (&logfont);
	if (!scaled_font->scaled_hfont) {
	    _cairo_win32_print_gdi_error ("_win32_scaled_font_get_scaled_hfont");
	    return NULL;
	}
    }

    return scaled_font->scaled_hfont;
}

static HFONT
_win32_scaled_font_get_unscaled_hfont (cairo_win32_scaled_font_t *scaled_font,
				       HDC                        hdc)
{
    if (!scaled_font->unscaled_hfont) {
	OUTLINETEXTMETRIC *otm;
	unsigned int otm_size;
	HFONT scaled_hfont;
	LOGFONTW logfont;

	scaled_hfont = _win32_scaled_font_get_scaled_hfont (scaled_font);
	if (!scaled_hfont)
	    return NULL;

	if (!SelectObject (hdc, scaled_hfont)) {
	    _cairo_win32_print_gdi_error ("_win32_scaled_font_get_unscaled_hfont:SelectObject");
	    return NULL;
	}

	otm_size = GetOutlineTextMetrics (hdc, 0, NULL);
	if (!otm_size) {
	    _cairo_win32_print_gdi_error ("_win32_scaled_font_get_unscaled_hfont:GetOutlineTextMetrics");
	    return NULL;
	}
	
	otm = malloc (otm_size);
	if (!otm)
	    return NULL;

	if (!GetOutlineTextMetrics (hdc, otm_size, otm)) {
	    _cairo_win32_print_gdi_error ("_win32_scaled_font_get_unscaled_hfont:GetOutlineTextMetrics");
	    free (otm);
	    return NULL;
	}

	scaled_font->em_square = otm->otmEMSquare;
	free (otm);
	
	logfont = scaled_font->logfont;
	logfont.lfHeight = scaled_font->em_square;
	logfont.lfWidth = 0;
	logfont.lfEscapement = 0;
	logfont.lfOrientation = 0;
	logfont.lfQuality = scaled_font->quality;
	
	scaled_font->unscaled_hfont = CreateFontIndirectW (&logfont);
	if (!scaled_font->unscaled_hfont) {
	    _cairo_win32_print_gdi_error ("_win32_scaled_font_get_unscaled_hfont:CreateIndirect");
	    return NULL;
	}
    }

    return scaled_font->unscaled_hfont;
}

static cairo_status_t
_cairo_win32_scaled_font_select_unscaled_font (cairo_scaled_font_t *scaled_font,
					       HDC                  hdc)
{
    cairo_status_t status;
    HFONT hfont;
    HFONT old_hfont = NULL;

    hfont = _win32_scaled_font_get_unscaled_hfont ((cairo_win32_scaled_font_t *)scaled_font, hdc);
    if (!hfont)
	return CAIRO_STATUS_NO_MEMORY;

    old_hfont = SelectObject (hdc, hfont);
    if (!old_hfont)
	return _cairo_win32_print_gdi_error ("_cairo_win32_scaled_font_select_unscaled_font");

    status = _win32_scaled_font_set_identity_transform (hdc);
    if (status) {
	SelectObject (hdc, old_hfont);
	return status;
    }

    SetMapMode (hdc, MM_TEXT);

    return CAIRO_STATUS_SUCCESS;
}

static void
_cairo_win32_scaled_font_done_unscaled_font (cairo_scaled_font_t *scaled_font)
{
}

/* implement the font backend interface */

static cairo_status_t
_cairo_win32_scaled_font_create (const char            *family, 
				 cairo_font_slant_t     slant, 
				 cairo_font_weight_t    weight,
				 const cairo_matrix_t  *font_matrix,
				 const cairo_matrix_t  *ctm,
				 cairo_scaled_font_t  **scaled_font_out)
{
    LOGFONTW logfont;
    cairo_scaled_font_t *scaled_font;
    uint16_t *face_name;
    int face_name_len;
    cairo_status_t status;

    status = _cairo_utf8_to_utf16 (family, -1, &face_name, &face_name_len);
    if (status)
	return status;

    if (face_name_len > LF_FACESIZE - 1) {
	free (face_name);
	return CAIRO_STATUS_INVALID_STRING;
    }

    memcpy (logfont.lfFaceName, face_name, sizeof (uint16_t) * (face_name_len + 1));
    free (face_name);

    logfont.lfHeight = 0;	/* filled in later */
    logfont.lfWidth = 0;	/* filled in later */
    logfont.lfEscapement = 0;	/* filled in later */
    logfont.lfOrientation = 0;	/* filled in later */

    switch (weight) {
    case CAIRO_FONT_WEIGHT_NORMAL:
    default:
	logfont.lfWeight = FW_NORMAL;
	break;
    case CAIRO_FONT_WEIGHT_BOLD:
	logfont.lfWeight = FW_BOLD;
	break;
    }

    switch (slant) {
    case CAIRO_FONT_SLANT_NORMAL:
    default:
	logfont.lfItalic = FALSE;
	break;
    case CAIRO_FONT_SLANT_ITALIC:
    case CAIRO_FONT_SLANT_OBLIQUE:
	logfont.lfItalic = TRUE;
	break;
    }

    logfont.lfUnderline = FALSE;
    logfont.lfStrikeOut = FALSE;
    /* The docs for LOGFONT discourage using this, since the
     * interpretation is locale-specific, but it's not clear what
     * would be a better alternative.
     */
    logfont.lfCharSet = DEFAULT_CHARSET; 
    logfont.lfOutPrecision = OUT_DEFAULT_PRECIS;
    logfont.lfClipPrecision = CLIP_DEFAULT_PRECIS;
    logfont.lfQuality = DEFAULT_QUALITY; /* filled in later */
    logfont.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;

    if (!logfont.lfFaceName)
	return CAIRO_STATUS_NO_MEMORY;
    
    scaled_font = _win32_scaled_font_create (&logfont, font_matrix, ctm);
    if (!scaled_font)
	return CAIRO_STATUS_NO_MEMORY;

    *scaled_font_out = scaled_font;

    return CAIRO_STATUS_SUCCESS;
}

static void 
_cairo_win32_scaled_font_destroy (void *abstract_font)
{
    cairo_win32_scaled_font_t *scaled_font = abstract_font;

    if (scaled_font == NULL)
	return;

    if (scaled_font->scaled_hfont)
	DeleteObject (scaled_font->scaled_hfont);

    if (scaled_font->unscaled_hfont)
	DeleteObject (scaled_font->unscaled_hfont);
}

static void
_cairo_win32_scaled_font_get_glyph_cache_key (void                    *abstract_font,
					      cairo_glyph_cache_key_t *key)
{
}

static cairo_status_t 
_cairo_win32_scaled_font_text_to_glyphs (void		*abstract_font,
					 const char	*utf8,
					 cairo_glyph_t **glyphs, 
					 int		*num_glyphs)
{
    cairo_win32_scaled_font_t *scaled_font = abstract_font;
    uint16_t *utf16;
    int n16;
    GCP_RESULTSW gcp_results;
    unsigned int buffer_size, i;
    WCHAR *glyph_indices = NULL;
    int *dx = NULL;
    cairo_status_t status = CAIRO_STATUS_SUCCESS;
    double x_pos;
    HDC hdc = NULL;

    status = _cairo_utf8_to_utf16 (utf8, -1, &utf16, &n16);
    if (status)
	return status;

    gcp_results.lStructSize = sizeof (GCP_RESULTS);
    gcp_results.lpOutString = NULL;
    gcp_results.lpOrder = NULL;
    gcp_results.lpCaretPos = NULL;
    gcp_results.lpClass = NULL;
    
    buffer_size = MAX (n16 * 1.2, 16);		/* Initially guess number of chars plus a few */
    if (buffer_size > INT_MAX) {
	status = CAIRO_STATUS_NO_MEMORY;
	goto FAIL1;
    }
    
    hdc = _get_global_font_dc ();
    if (!hdc) {
	status = CAIRO_STATUS_NO_MEMORY;
	goto FAIL1;
    }

    status = cairo_win32_scaled_font_select_font (&scaled_font->base, hdc);
    if (status)
	goto FAIL1;
    
    while (TRUE) {
	if (glyph_indices) {
	    free (glyph_indices);
	    glyph_indices = NULL;
	}
	if (dx) {
	    free (dx);
	    dx = NULL;
	}
	
	glyph_indices = malloc (sizeof (WCHAR) * buffer_size);
	dx = malloc (sizeof (int) * buffer_size);
	if (!glyph_indices || !dx) {
	    status = CAIRO_STATUS_NO_MEMORY;
	    goto FAIL2;
	}

	gcp_results.nGlyphs = buffer_size;
	gcp_results.lpDx = dx;
	gcp_results.lpGlyphs = glyph_indices;

	if (!GetCharacterPlacementW (hdc, utf16, n16,
				     0,
				     &gcp_results, 
				     GCP_DIACRITIC | GCP_LIGATE | GCP_GLYPHSHAPE | GCP_REORDER)) {
	    status = _cairo_win32_print_gdi_error ("_cairo_win32_scaled_font_text_to_glyphs");
	    goto FAIL2;
	}

	if (gcp_results.lpDx && gcp_results.lpGlyphs)
	    break;

	/* Too small a buffer, try again */
	
	buffer_size *= 1.5;
	if (buffer_size > INT_MAX) {
	    status = CAIRO_STATUS_NO_MEMORY;
	    goto FAIL2;
	}
    }

    *num_glyphs = gcp_results.nGlyphs;
    *glyphs = malloc (sizeof (cairo_glyph_t) * gcp_results.nGlyphs);
    if (!*glyphs) {
	status = CAIRO_STATUS_NO_MEMORY;
	goto FAIL2;
    }

    x_pos = 0;
    for (i = 0; i < gcp_results.nGlyphs; i++) {
	(*glyphs)[i].index = glyph_indices[i];
	(*glyphs)[i].x = x_pos ;
	(*glyphs)[i].y = 0;

	x_pos += dx[i] / scaled_font->logical_scale;
    }

 FAIL2:
    if (glyph_indices)
	free (glyph_indices);
    if (dx)
	free (dx);
   
    cairo_win32_scaled_font_done_font (&scaled_font->base);
    
 FAIL1:
    free (utf16);
   
    return status;
}

static cairo_status_t 
_cairo_win32_scaled_font_font_extents (void		    *abstract_font,
				       cairo_font_extents_t *extents)
{
    cairo_win32_scaled_font_t *scaled_font = abstract_font;
    cairo_status_t status;
    TEXTMETRIC metrics;
    HDC hdc;

    hdc = _get_global_font_dc ();
    if (!hdc)
	return CAIRO_STATUS_NO_MEMORY;

    if (scaled_font->preserve_axes) {
	/* For 90-degree rotations (including 0), we get the metrics
	 * from the GDI in logical space, then convert back to font space
	 */
	status = cairo_win32_scaled_font_select_font (&scaled_font->base, hdc);
	if (status)
	    return status;
	GetTextMetrics (hdc, &metrics);
	cairo_win32_scaled_font_done_font (&scaled_font->base);

	extents->ascent = metrics.tmAscent / scaled_font->logical_scale;
	extents->descent = metrics.tmDescent / scaled_font->logical_scale;

	extents->height = (metrics.tmHeight + metrics.tmExternalLeading) / scaled_font->logical_scale;
	extents->max_x_advance = metrics.tmMaxCharWidth / scaled_font->logical_scale;
	extents->max_y_advance = 0;

    } else {
	/* For all other transformations, we use the design metrics
	 * of the font. The GDI results from GetTextMetrics() on a
	 * transformed font are inexplicably large and we want to
	 * avoid them.
	 */
	status = _cairo_win32_scaled_font_select_unscaled_font (&scaled_font->base, hdc);
	if (status)
	    return status;
	GetTextMetrics (hdc, &metrics);
	_cairo_win32_scaled_font_done_unscaled_font (&scaled_font->base);

	extents->ascent = (double)metrics.tmAscent / scaled_font->em_square;
	extents->descent = metrics.tmDescent * scaled_font->em_square;
	extents->height = (double)(metrics.tmHeight + metrics.tmExternalLeading) / scaled_font->em_square;
	extents->max_x_advance = (double)(metrics.tmMaxCharWidth) / scaled_font->em_square;
	extents->max_y_advance = 0;
	
    }

    return CAIRO_STATUS_SUCCESS;
}

static cairo_status_t 
_cairo_win32_scaled_font_glyph_extents (void		     *abstract_font,
					cairo_glyph_t	     *glyphs, 
					int		      num_glyphs,
					cairo_text_extents_t *extents)
{
    cairo_win32_scaled_font_t *scaled_font = abstract_font;
    static const MAT2 matrix = { { 0, 1 }, { 0, 0 }, { 0, 0 }, { 0, 1 } };
    GLYPHMETRICS metrics;
    cairo_status_t status;
    HDC hdc;

    hdc = _get_global_font_dc ();
    if (!hdc)
	return CAIRO_STATUS_NO_MEMORY;

    /* We handle only the case num_glyphs == 1, glyphs[i].x == glyphs[0].y == 0.
     * This is all that the calling code triggers, and the backend interface
     * will eventually be changed to match
     */
    assert (num_glyphs == 1);

    if (scaled_font->preserve_axes) {
	/* If we aren't rotating / skewing the axes, then we get the metrics
	 * from the GDI in device space and convert to font space.
	 */
	status = cairo_win32_scaled_font_select_font (&scaled_font->base, hdc);
	if (status)
	    return status;
	GetGlyphOutlineW (hdc, glyphs[0].index, GGO_METRICS | GGO_GLYPH_INDEX,
			  &metrics, 0, NULL, &matrix);
	cairo_win32_scaled_font_done_font (&scaled_font->base);

	if (scaled_font->swap_axes) {
	    extents->x_bearing = - metrics.gmptGlyphOrigin.y / scaled_font->y_scale;
	    extents->y_bearing = metrics.gmptGlyphOrigin.x / scaled_font->x_scale;
	    extents->width = metrics.gmBlackBoxY / scaled_font->y_scale;
	    extents->height = metrics.gmBlackBoxX / scaled_font->x_scale;
	    extents->x_advance = metrics.gmCellIncY / scaled_font->x_scale;
	    extents->y_advance = metrics.gmCellIncX / scaled_font->y_scale;
	} else {
	    extents->x_bearing = metrics.gmptGlyphOrigin.x / scaled_font->x_scale;
	    extents->y_bearing = - metrics.gmptGlyphOrigin.y / scaled_font->y_scale;
	    extents->width = metrics.gmBlackBoxX / scaled_font->x_scale;
	    extents->height = metrics.gmBlackBoxY / scaled_font->y_scale;
	    extents->x_advance = metrics.gmCellIncX / scaled_font->x_scale;
	    extents->y_advance = metrics.gmCellIncY / scaled_font->y_scale;
	}

	if (scaled_font->swap_x) {
	    extents->x_bearing = (- extents->x_bearing - extents->width);
	    extents->x_advance = - extents->x_advance;
	}

	if (scaled_font->swap_y) {
	    extents->y_bearing = (- extents->y_bearing - extents->height);
	    extents->y_advance = - extents->y_advance;
	}
	
    } else {
	/* For all other transformations, we use the design metrics
	 * of the font.
	 */
	status = _cairo_win32_scaled_font_select_unscaled_font (&scaled_font->base, hdc);
	GetGlyphOutlineW (hdc, glyphs[0].index, GGO_METRICS | GGO_GLYPH_INDEX,
			  &metrics, 0, NULL, &matrix);
	_cairo_win32_scaled_font_done_unscaled_font (&scaled_font->base);

	extents->x_bearing = (double)metrics.gmptGlyphOrigin.x / scaled_font->em_square;
	extents->y_bearing = - (double)metrics.gmptGlyphOrigin.y / scaled_font->em_square;
	extents->width = (double)metrics.gmBlackBoxX / scaled_font->em_square;
	extents->height = (double)metrics.gmBlackBoxY / scaled_font->em_square;
	extents->x_advance = (double)metrics.gmCellIncX / scaled_font->em_square;
	extents->y_advance = (double)metrics.gmCellIncY / scaled_font->em_square;
    }

    return CAIRO_STATUS_SUCCESS;
}


static cairo_status_t 
_cairo_win32_scaled_font_glyph_bbox (void		 *abstract_font,
				     const cairo_glyph_t *glyphs,
				     int                  num_glyphs,
				     cairo_box_t         *bbox)
{
    static const MAT2 matrix = { { 0, 1 }, { 0, 0 }, { 0, 0 }, { 0, 1 } };
    cairo_win32_scaled_font_t *scaled_font = abstract_font;
    int x1 = 0, x2 = 0, y1 = 0, y2 = 0;

    if (num_glyphs > 0) {
	HDC hdc = _get_global_font_dc ();
	GLYPHMETRICS metrics;
	cairo_status_t status;
	int i;

	if (!hdc)
	    return CAIRO_STATUS_NO_MEMORY;

	status = cairo_win32_scaled_font_select_font (&scaled_font->base, hdc);
	if (status)
	    return status;

	for (i = 0; i < num_glyphs; i++) {
	    int x = floor (0.5 + glyphs[i].x);
	    int y = floor (0.5 + glyphs[i].y);

	    GetGlyphOutlineW (hdc, glyphs[i].index, GGO_METRICS | GGO_GLYPH_INDEX,
			     &metrics, 0, NULL, &matrix);

	    if (i == 0 || x1 > x + metrics.gmptGlyphOrigin.x)
		x1 = x + metrics.gmptGlyphOrigin.x;
	    if (i == 0 || y1 > y - metrics.gmptGlyphOrigin.y)
		y1 = y - metrics.gmptGlyphOrigin.y;
	    if (i == 0 || x2 < x + metrics.gmptGlyphOrigin.x + metrics.gmBlackBoxX)
		x2 = x + metrics.gmptGlyphOrigin.x + metrics.gmBlackBoxX;
	    if (i == 0 || y2 < y - metrics.gmptGlyphOrigin.y + metrics.gmBlackBoxY)
		y2 = y - metrics.gmptGlyphOrigin.y + metrics.gmBlackBoxY;
	}

	cairo_win32_scaled_font_done_font (&scaled_font->base);
    }

    bbox->p1.x = _cairo_fixed_from_int (x1);
    bbox->p1.y = _cairo_fixed_from_int (y1);
    bbox->p2.x = _cairo_fixed_from_int (x2);
    bbox->p2.y = _cairo_fixed_from_int (y2);

    return CAIRO_STATUS_SUCCESS;
}

typedef struct {
    cairo_win32_scaled_font_t *scaled_font;
    HDC hdc;
    
    cairo_array_t glyphs;
    cairo_array_t dx;

    int start_x;
    int last_x;
    int last_y;
} cairo_glyph_state_t;

static void
_start_glyphs (cairo_glyph_state_t        *state,
	       cairo_win32_scaled_font_t  *scaled_font,
	       HDC                         hdc)
{
    state->hdc = hdc;
    state->scaled_font = scaled_font;

    _cairo_array_init (&state->glyphs, sizeof (WCHAR));
    _cairo_array_init (&state->dx, sizeof (int));
}

static cairo_status_t
_flush_glyphs (cairo_glyph_state_t *state)
{
    int dx = 0;
    if (!_cairo_array_append (&state->dx, &dx, 1))
	return CAIRO_STATUS_NO_MEMORY;
    
    if (!ExtTextOutW (state->hdc,
		      state->start_x, state->last_y,
		      ETO_GLYPH_INDEX,
		      NULL,
		      (WCHAR *)state->glyphs.elements,
		      state->glyphs.num_elements,
		      (int *)state->dx.elements)) {
	return _cairo_win32_print_gdi_error ("_flush_glyphs");
    }
    
    _cairo_array_truncate (&state->glyphs, 0);
    _cairo_array_truncate (&state->dx, 0);

    return CAIRO_STATUS_SUCCESS;
}

static cairo_status_t
_add_glyph (cairo_glyph_state_t *state,
	    unsigned long        index,
	    double               device_x,
	    double               device_y)
{
    double user_x = device_x;
    double user_y = device_y;
    WCHAR glyph_index = index;
    int logical_x, logical_y;

    cairo_matrix_transform_point (&state->scaled_font->device_to_logical, &user_x, &user_y);

    logical_x = floor (user_x + 0.5);
    logical_y = floor (user_y + 0.5);

    if (state->glyphs.num_elements > 0) {
	int dx;
	
	if (logical_y != state->last_y) {
	    cairo_status_t status = _flush_glyphs (state);
	    if (status)
		return status;
	    state->start_x = logical_x;
	}
	
	dx = logical_x - state->last_x;
	if (!_cairo_array_append (&state->dx, &dx, 1))
	    return CAIRO_STATUS_NO_MEMORY;
    } else {
	state->start_x = logical_x;
    }

    state->last_x = logical_x;
    state->last_y = logical_y;
    
    _cairo_array_append (&state->glyphs, &glyph_index, 1);

    return CAIRO_STATUS_SUCCESS;
}

static void
_finish_glyphs (cairo_glyph_state_t *state)
{
    _flush_glyphs (state);

    _cairo_array_fini (&state->glyphs);
    _cairo_array_fini (&state->dx);
}

static cairo_status_t
_draw_glyphs_on_surface (cairo_win32_surface_t     *surface,
			 cairo_win32_scaled_font_t *scaled_font,
			 COLORREF                   color,
			 int                        x_offset,
			 int                        y_offset,
			 const cairo_glyph_t       *glyphs,
			 int                 	    num_glyphs)
{
    cairo_glyph_state_t state;
    cairo_status_t status = CAIRO_STATUS_SUCCESS;
    int i;

    if (!SaveDC (surface->dc))
	return _cairo_win32_print_gdi_error ("_draw_glyphs_on_surface:SaveDC");

    status = cairo_win32_scaled_font_select_font (&scaled_font->base, surface->dc);
    if (status)
	goto FAIL1;

    SetTextColor (surface->dc, color);
    SetTextAlign (surface->dc, TA_BASELINE | TA_LEFT);
    SetBkMode (surface->dc, TRANSPARENT);
    
    _start_glyphs (&state, scaled_font, surface->dc);

    for (i = 0; i < num_glyphs; i++) {
	status = _add_glyph (&state, glyphs[i].index,
			     glyphs[i].x - x_offset, glyphs[i].y - y_offset);
	if (status)
	    goto FAIL2;
    }

 FAIL2:
    _finish_glyphs (&state);
    cairo_win32_scaled_font_done_font (&scaled_font->base);
 FAIL1:
    RestoreDC (surface->dc, 1);
    
    return status;
}
		
/* Duplicate the green channel of a 4-channel mask in the alpha channel, then
 * invert the whole mask.
 */
static void
_compute_argb32_mask_alpha (cairo_win32_surface_t *mask_surface)
{
    cairo_image_surface_t *image = (cairo_image_surface_t *)mask_surface->image;
    int i, j;

    for (i = 0; i < image->height; i++) {
	uint32_t *p = (uint32_t *) (image->data + i * image->stride);
	for (j = 0; j < image->width; j++) {
	    *p = 0xffffffff ^ (*p | ((*p & 0x0000ff00) << 16));
	    p++;
	}
    }
}

/* Invert a mask
 */
static void
_invert_argb32_mask (cairo_win32_surface_t *mask_surface)
{
    cairo_image_surface_t *image = (cairo_image_surface_t *)mask_surface->image;
    int i, j;

    for (i = 0; i < image->height; i++) {
	uint32_t *p = (uint32_t *) (image->data + i * image->stride);
	for (j = 0; j < image->width; j++) {
	    *p = 0xffffffff ^ *p;
	    p++;
	}
    }
}

/* Compute an alpha-mask from a monochrome RGB24 image
 */
static cairo_surface_t *
_compute_a8_mask (cairo_win32_surface_t *mask_surface)
{
    cairo_image_surface_t *image24 = (cairo_image_surface_t *)mask_surface->image;
    cairo_image_surface_t *image8;
    int i, j;

    image8 = (cairo_image_surface_t *)cairo_image_surface_create (CAIRO_FORMAT_A8,
								  image24->width, image24->height);
    if (!image8)
	return NULL;

    for (i = 0; i < image24->height; i++) {
	uint32_t *p = (uint32_t *) (image24->data + i * image24->stride);
	unsigned char *q = (unsigned char *) (image8->data + i * image8->stride);
	
	for (j = 0; j < image24->width; j++) {
	    *q = 255 - ((*p & 0x0000ff00) >> 8);
	    p++;
	    q++;
	}
    }

    return &image8->base;
}

static cairo_status_t 
_cairo_win32_scaled_font_show_glyphs (void		       *abstract_font,
				      cairo_operator_t    	operator,
				      cairo_pattern_t          *pattern,
				      cairo_surface_t          *generic_surface,
				      int                 	source_x,
				      int                 	source_y,
				      int			dest_x,
				      int			dest_y,
				      unsigned int		width,
				      unsigned int		height,
				      const cairo_glyph_t      *glyphs,
				      int                 	num_glyphs)
{
    cairo_win32_scaled_font_t *scaled_font = abstract_font;
    cairo_win32_surface_t *surface = (cairo_win32_surface_t *)generic_surface;
    cairo_status_t status;

    if (width == 0 || height == 0)
	return CAIRO_STATUS_SUCCESS;

    if (_cairo_surface_is_win32 (generic_surface) &&
	surface->format == CAIRO_FORMAT_RGB24 &&
	operator == CAIRO_OPERATOR_OVER &&
	_cairo_pattern_is_opaque_solid (pattern)) {

	cairo_solid_pattern_t *solid_pattern = (cairo_solid_pattern_t *)pattern;

	/* When compositing OVER on a GDI-understood surface, with a
	 * solid opaque color, we can just call ExtTextOut directly.
	 */
	COLORREF new_color;
	
	/* XXX Use the unpremultiplied or premultiplied color? */
	new_color = RGB (((int)solid_pattern->color.red_short) >> 8,
			 ((int)solid_pattern->color.green_short) >> 8,
			 ((int)solid_pattern->color.blue_short) >> 8);

	status = _draw_glyphs_on_surface (surface, scaled_font, new_color,
					  0, 0,
					  glyphs, num_glyphs);
	
	return status;
    } else {
	/* Otherwise, we need to draw using software fallbacks. We create a mask 
	 * surface by drawing the the glyphs onto a DIB, black-on-white then
	 * inverting. GDI outputs gamma-corrected images so inverted black-on-white
	 * is very different from white-on-black. We favor the more common
	 * case where the final output is dark-on-light.
	 */
	cairo_win32_surface_t *tmp_surface;
	cairo_surface_t *mask_surface;
	cairo_surface_pattern_t mask;
	RECT r;

	tmp_surface = (cairo_win32_surface_t *)_cairo_win32_surface_create_dib (CAIRO_FORMAT_ARGB32, width, height);
	if (!tmp_surface)
	    return CAIRO_STATUS_NO_MEMORY;

	r.left = 0;
	r.top = 0;
	r.right = width;
	r.bottom = height;
	FillRect (tmp_surface->dc, &r, GetStockObject (WHITE_BRUSH));

	_draw_glyphs_on_surface (tmp_surface, scaled_font, RGB (0, 0, 0),
				 dest_x, dest_y,
				 glyphs, num_glyphs);

	if (scaled_font->quality == CLEARTYPE_QUALITY) {
	    /* For ClearType, we need a 4-channel mask. If we are compositing on
	     * a surface with alpha, we need to compute the alpha channel of
	     * the mask (we just copy the green channel). But for a destination
	     * surface without alpha the alpha channel of the mask is ignored
	     */

	    if (surface->format != CAIRO_FORMAT_RGB24)
		_compute_argb32_mask_alpha (tmp_surface);
	    else
		_invert_argb32_mask (tmp_surface);
	    
	    mask_surface = &tmp_surface->base;

	    /* XXX: Hacky, should expose this in cairo_image_surface */
	    pixman_image_set_component_alpha (((cairo_image_surface_t *)tmp_surface->image)->pixman_image, TRUE);
	    
	} else {
	    mask_surface = _compute_a8_mask (tmp_surface);
	    cairo_surface_destroy (&tmp_surface->base);
	    if (!mask_surface)
		return CAIRO_STATUS_NO_MEMORY;
	}

	/* For operator == OVER, no-cleartype, a possible optimization here is to
	 * draw onto an intermediate ARGB32 surface and alpha-blend that with the
	 * destination
	 */
	_cairo_pattern_init_for_surface (&mask, mask_surface);

	status = _cairo_surface_composite (operator, pattern, 
					   &mask.base,
					   &surface->base,
					   source_x, source_y,
					   0, 0,
					   dest_x, dest_y,
					   width, height);

	_cairo_pattern_fini (&mask.base);
	
	cairo_surface_destroy (mask_surface);

	return status;
    }
}

static cairo_fixed_t
_cairo_fixed_from_FIXED (FIXED f)
{
    return *((cairo_fixed_t *)&f);
}

static cairo_status_t 
_cairo_win32_scaled_font_glyph_path (void               *abstract_font,
                                     cairo_glyph_t      *glyphs, 
                                     int                 num_glyphs,
                                     cairo_path_fixed_t *path)
{
    static const MAT2 matrix = { { 0, 1 }, { 0, 0 }, { 0, 0 }, { 0, -1 } };
    cairo_win32_scaled_font_t *scaled_font = abstract_font;
    cairo_status_t status;
    GLYPHMETRICS metrics;
    HDC hdc;
    int i;

    hdc = _get_global_font_dc ();
    if (!hdc)
        return CAIRO_STATUS_NO_MEMORY;

    status = cairo_win32_scaled_font_select_font (&scaled_font->base, hdc);
    if (status)
        return status;

    for (i = 0; i < num_glyphs; i++)
    {
        DWORD bytesGlyph;
        unsigned char *buffer, *ptr;

        cairo_fixed_t x = _cairo_fixed_from_double (glyphs[i].x);
        cairo_fixed_t y = _cairo_fixed_from_double (glyphs[i].y);

        bytesGlyph = GetGlyphOutlineW (hdc, glyphs[i].index,
                                       GGO_NATIVE | GGO_GLYPH_INDEX,
                                       &metrics, 0, NULL, &matrix);

        if (bytesGlyph == GDI_ERROR) {
            status = _cairo_win32_print_gdi_error ("_cairo_win32_scaled_font_glyph_path");
            goto FAIL;
        }

        ptr = buffer = malloc (bytesGlyph);

        if (!buffer) {
            status = CAIRO_STATUS_NO_MEMORY;
            goto FAIL;
        }

        if (GetGlyphOutlineW (hdc, glyphs[i].index,
                              GGO_NATIVE | GGO_GLYPH_INDEX,
                              &metrics, bytesGlyph, buffer, &matrix) == GDI_ERROR) {
            status = _cairo_win32_print_gdi_error ("_cairo_win32_scaled_font_glyph_path");
            free (buffer);
            goto FAIL;
        }
        
        while (ptr < buffer + bytesGlyph) {
            TTPOLYGONHEADER *header = (TTPOLYGONHEADER *)ptr;
            unsigned char *endPoly = ptr + header->cb;

            ptr += sizeof (TTPOLYGONHEADER);

            _cairo_path_fixed_move_to (path,
                                       _cairo_fixed_from_FIXED (header->pfxStart.x) + x,
                                       _cairo_fixed_from_FIXED (header->pfxStart.y) + y);

            while (ptr < endPoly) {
                TTPOLYCURVE *curve = (TTPOLYCURVE *)ptr;
                POINTFX *points = curve->apfx;
                int i;
                switch (curve->wType) {
                case TT_PRIM_LINE:
                    for (i = 0; i < curve->cpfx; i++) {
                        _cairo_path_fixed_line_to (path,
                                                   _cairo_fixed_from_FIXED (points[i].x) + x,
                                                   _cairo_fixed_from_FIXED (points[i].y) + y);
                    }
                    break;
                case TT_PRIM_QSPLINE:
                    for (i = 0; i < curve->cpfx - 1; i++) {
                        cairo_fixed_t p1x, p1y, p2x, p2y, cx, cy, c1x, c1y, c2x, c2y;
                        _cairo_path_fixed_get_current_point (path, &p1x, &p1y);
                        cx = _cairo_fixed_from_FIXED (points[i].x) + x;
                        cy = _cairo_fixed_from_FIXED (points[i].y) + y;

                        if (i + 1 == curve->cpfx - 1) {
                            p2x = _cairo_fixed_from_FIXED (points[i + 1].x) + x;
                            p2y = _cairo_fixed_from_FIXED (points[i + 1].y) + y;
                        } else {
                            /* records with more than one curve use interpolation for
                               control points, per http://support.microsoft.com/kb/q87115/ */
                            p2x = (cx + _cairo_fixed_from_FIXED (points[i + 1].x) + x) / 2;
                            p2y = (cy + _cairo_fixed_from_FIXED (points[i + 1].y) + y) / 2;
                        }

                        c1x = 2 * cx / 3 + p1x / 3;
                        c1y = 2 * cy / 3 + p1y / 3;
                        c2x = 2 * cx / 3 + p2x / 3;
                        c2y = 2 * cy / 3 + p2y / 3;

                        _cairo_path_fixed_curve_to (path, c1x, c1y, c2x, c2y, p2x, p2y);
                    }
                    break;
                case TT_PRIM_CSPLINE:
                    for (i = 0; i < curve->cpfx - 2; i += 2) {
                        _cairo_path_fixed_curve_to (path,
                                                    _cairo_fixed_from_FIXED (points[i].x) + x,
                                                    _cairo_fixed_from_FIXED (points[i].y) + y,
                                                    _cairo_fixed_from_FIXED (points[i + 1].x) + x,
                                                    _cairo_fixed_from_FIXED (points[i + 1].y) + y,
                                                    _cairo_fixed_from_FIXED (points[i + 2].x) + x,
                                                    _cairo_fixed_from_FIXED (points[i + 2].y) + y);
                    }
                    break;
                }
                ptr += sizeof(TTPOLYCURVE) + sizeof (POINTFX) * (curve->cpfx - 1);
            }
            _cairo_path_fixed_close_path (path);
        }
        free(buffer);
    }

FAIL:

    cairo_win32_scaled_font_done_font (&scaled_font->base);

    return status;
}

const cairo_scaled_font_backend_t cairo_win32_scaled_font_backend = {
    _cairo_win32_scaled_font_create,
    _cairo_win32_scaled_font_destroy,
    _cairo_win32_scaled_font_font_extents,
    _cairo_win32_scaled_font_text_to_glyphs,
    _cairo_win32_scaled_font_glyph_extents,
    _cairo_win32_scaled_font_glyph_bbox,
    _cairo_win32_scaled_font_show_glyphs,
    _cairo_win32_scaled_font_glyph_path,
    _cairo_win32_scaled_font_get_glyph_cache_key,
};

/* cairo_win32_font_face_t */

typedef struct _cairo_win32_font_face cairo_win32_font_face_t;

struct _cairo_win32_font_face {
    cairo_font_face_t base;
    LOGFONTW logfont;
};

/* implement the platform-specific interface */

static void
_cairo_win32_font_face_destroy (void *abstract_face)
{
}

static cairo_status_t
_cairo_win32_font_face_create_font (void                  *abstract_face,
				    const cairo_matrix_t  *font_matrix,
				    const cairo_matrix_t  *ctm,
				    cairo_scaled_font_t  **font)
{
    cairo_win32_font_face_t *font_face = abstract_face;

    *font = _win32_scaled_font_create (&font_face->logfont,
				       font_matrix, ctm);
    if (*font)
	return CAIRO_STATUS_SUCCESS;
    else
	return CAIRO_STATUS_NO_MEMORY;
}

static const cairo_font_face_backend_t _cairo_win32_font_face_backend = {
    _cairo_win32_font_face_destroy,
    _cairo_win32_font_face_create_font,
};

/**
 * cairo_win32_font_face_create_for_logfontw:
 * @logfont: A #LOGFONTW structure specifying the font to use.
 *   The lfHeight, lfWidth, lfOrientation and lfEscapement
 *   fields of this structure are ignored.
 * 
 * Creates a new font for the Win32 font backend based on a
 * #LOGFONT. This font can then be used with
 * cairo_set_font_face() or cairo_font_create(). The #cairo_scaled_font_t
 * returned from cairo_font_create() is also for the Win32 backend
 * and can be used with functions such as cairo_win32_scaled_font_select_font().
 *
 * Return value: a newly created #cairo_font_face_t. Free with
 *  cairo_font_face_destroy() when you are done using it.
 **/
cairo_font_face_t *
cairo_win32_font_face_create_for_logfontw (LOGFONTW *logfont)
{
    cairo_win32_font_face_t *font_face;

    font_face = malloc (sizeof (cairo_win32_font_face_t));
    if (!font_face)
	return NULL;
    
    font_face->logfont = *logfont;
    
    _cairo_font_face_init (&font_face->base, &_cairo_win32_font_face_backend);

    return &font_face->base;
}

/**
 * cairo_win32_scaled_font_select_font:
 * @scaled_font: A #cairo_scaled_font_t from the Win32 font backend. Such an
 *   object can be created with cairo_win32_scaled_font_create_for_logfontw().
 * @hdc: a device context
 *
 * Selects the font into the given device context and changes the
 * map mode and world transformation of the device context to match
 * that of the font. This function is intended for use when using
 * layout APIs such as Uniscribe to do text layout with the
 * cairo font. After finishing using the device context, you must call
 * cairo_win32_scaled_font_done_font() to release any resources allocated
 * by this function.
 *
 * See cairo_win32_scaled_font_get_metrics_factor() for converting logical
 * coordinates from the device context to font space.
 *
 * Normally, calls to SaveDC() and RestoreDC() would be made around
 * the use of this function to preserve the original graphics state.
 * 
 * Return value: %CAIRO_STATUS_SUCCESS if the operation succeeded.
 *   otherwise an error such as %CAIRO_STATUS_NO_MEMORY and
 *   the device context is unchanged.
 **/
cairo_status_t
cairo_win32_scaled_font_select_font (cairo_scaled_font_t *scaled_font,
				     HDC                  hdc)
{
    cairo_status_t status;
    HFONT hfont;
    HFONT old_hfont = NULL;
    int old_mode;

    hfont = _win32_scaled_font_get_scaled_hfont ((cairo_win32_scaled_font_t *)scaled_font);
    if (!hfont)
	return CAIRO_STATUS_NO_MEMORY;

    old_hfont = SelectObject (hdc, hfont);
    if (!old_hfont)
	return _cairo_win32_print_gdi_error ("cairo_win32_scaled_font_select_font");

    old_mode = SetGraphicsMode (hdc, GM_ADVANCED);
    if (!old_mode) {
	status = _cairo_win32_print_gdi_error ("cairo_win32_scaled_font_select_font");
	SelectObject (hdc, old_hfont);
	return status;
    }

    status = _win32_scaled_font_set_world_transform ((cairo_win32_scaled_font_t *)scaled_font, hdc);
    if (status) {
	SetGraphicsMode (hdc, old_mode);
	SelectObject (hdc, old_hfont);
	return status;
    }

    SetMapMode (hdc, MM_TEXT);

    return CAIRO_STATUS_SUCCESS;
}

/**
 * cairo_win32_scaled_font_done_font:
 * @scaled_font: A #cairo_scaled_font_t from the Win32 font backend.
 * 
 * Releases any resources allocated by cairo_win32_scaled_font_select_font()
 **/
void
cairo_win32_scaled_font_done_font (cairo_scaled_font_t *scaled_font)
{
}

/**
 * cairo_win32_scaled_font_get_metrics_factor:
 * @scaled_font: a #cairo_scaled_font_t from the Win32 font backend
 * 
 * Gets a scale factor between logical coordinates in the coordinate
 * space used by cairo_win32_scaled_font_select_font() (that is, the
 * coordinate system used by the Windows functions to return metrics) and
 * font space coordinates.
 * 
 * Return value: factor to multiply logical units by to get font space
 *               coordinates.
 **/
double
cairo_win32_scaled_font_get_metrics_factor (cairo_scaled_font_t *scaled_font)
{
    return 1. / ((cairo_win32_scaled_font_t *)scaled_font)->logical_scale;
}