-
Notifications
You must be signed in to change notification settings - Fork 5
/
harfbuzz-hb-common.html
2743 lines (2742 loc) · 115 KB
/
harfbuzz-hb-common.html
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
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>hb-common: HarfBuzz Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="HarfBuzz Manual">
<link rel="up" href="core-api.html" title="Core API">
<link rel="prev" href="harfbuzz-hb-buffer.html" title="hb-buffer">
<link rel="next" href="harfbuzz-hb-features.html" title="hb-features">
<meta name="generator" content="GTK-Doc V1.32 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span>
<a href="#harfbuzz-hb-common.description" class="shortcut">Description</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="core-api.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="harfbuzz-hb-buffer.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="harfbuzz-hb-features.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="harfbuzz-hb-common"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="harfbuzz-hb-common.top_of_page"></a>hb-common</span></h2>
<p>hb-common — Common data types</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="harfbuzz-hb-common.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#HB-TAG:CAPS" title="HB_TAG()">HB_TAG</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#HB-UNTAG:CAPS" title="HB_UNTAG()">HB_UNTAG</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="returnvalue">hb_tag_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-tag-from-string" title="hb_tag_from_string ()">hb_tag_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-tag-to-string" title="hb_tag_to_string ()">hb_tag_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="returnvalue">hb_direction_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-direction-from-string" title="hb_direction_from_string ()">hb_direction_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-direction-to-string" title="hb_direction_to_string ()">hb_direction_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-REVERSE:CAPS" title="HB_DIRECTION_REVERSE()">HB_DIRECTION_REVERSE</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-IS-BACKWARD:CAPS" title="HB_DIRECTION_IS_BACKWARD()">HB_DIRECTION_IS_BACKWARD</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-IS-FORWARD:CAPS" title="HB_DIRECTION_IS_FORWARD()">HB_DIRECTION_IS_FORWARD</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-IS-HORIZONTAL:CAPS" title="HB_DIRECTION_IS_HORIZONTAL()">HB_DIRECTION_IS_HORIZONTAL</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-IS-VALID:CAPS" title="HB_DIRECTION_IS_VALID()">HB_DIRECTION_IS_VALID</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-IS-VERTICAL:CAPS" title="HB_DIRECTION_IS_VERTICAL()">HB_DIRECTION_IS_VERTICAL</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="returnvalue">hb_script_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-script-from-iso15924-tag" title="hb_script_from_iso15924_tag ()">hb_script_from_iso15924_tag</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="returnvalue">hb_tag_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-script-to-iso15924-tag" title="hb_script_to_iso15924_tag ()">hb_script_to_iso15924_tag</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="returnvalue">hb_script_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-script-from-string" title="hb_script_from_string ()">hb_script_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="returnvalue">hb_direction_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-script-get-horizontal-direction" title="hb_script_get_horizontal_direction ()">hb_script_get_horizontal_direction</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="returnvalue">hb_language_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-language-from-string" title="hb_language_from_string ()">hb_language_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-language-to-string" title="hb_language_to_string ()">hb_language_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="returnvalue">hb_language_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-language-get-default" title="hb_language_get_default ()">hb_language_get_default</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-language-matches" title="hb_language_matches ()">hb_language_matches</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-feature-from-string" title="hb_feature_from_string ()">hb_feature_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-feature-to-string" title="hb_feature_to_string ()">hb_feature_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-variation-from-string" title="hb_variation_from_string ()">hb_variation_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-common.html#hb-variation-to-string" title="hb_variation_to_string ()">hb_variation_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="harfbuzz-hb-common.html#hb-destroy-func-t" title="hb_destroy_func_t ()">*hb_destroy_func_t</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-common.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t">hb_bool_t</a></td>
</tr>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t">hb_codepoint_t</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#HB-CODEPOINT-INVALID:CAPS" title="HB_CODEPOINT_INVALID">HB_CODEPOINT_INVALID</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t">hb_direction_t</a></td>
</tr>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t">hb_language_t</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-feature-t" title="hb_feature_t">hb_feature_t</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-variation-t" title="hb_variation_t">hb_variation_t</a></td>
</tr>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-mask-t" title="hb_mask_t">hb_mask_t</a></td>
</tr>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t">hb_position_t</a></td>
</tr>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t">hb_tag_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t">hb_script_t</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#hb-user-data-key-t" title="hb_user_data_key_t">hb_user_data_key_t</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE">HB_TAG_NONE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#HB-TAG-MAX:CAPS" title="HB_TAG_MAX">HB_TAG_MAX</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#HB-TAG-MAX-SIGNED:CAPS" title="HB_TAG_MAX_SIGNED">HB_TAG_MAX_SIGNED</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#HB-LANGUAGE-INVALID:CAPS" title="HB_LANGUAGE_INVALID">HB_LANGUAGE_INVALID</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#HB-FEATURE-GLOBAL-END:CAPS" title="HB_FEATURE_GLOBAL_END">HB_FEATURE_GLOBAL_END</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-common.html#HB-FEATURE-GLOBAL-START:CAPS" title="HB_FEATURE_GLOBAL_START">HB_FEATURE_GLOBAL_START</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-common.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <hb.h>
</pre>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-common.description"></a><h2>Description</h2>
<p>Common data types used across HarfBuzz are defined here.</p>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-common.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="HB-TAG:CAPS"></a><h3>HB_TAG()</h3>
<pre class="programlisting">#define HB_TAG(c1,c2,c3,c4) ((hb_tag_t)((((uint32_t)(c1)&0xFF)<<24)|(((uint32_t)(c2)&0xFF)<<16)|(((uint32_t)(c3)&0xFF)<<8)|((uint32_t)(c4)&0xFF)))
</pre>
<p>Constructs an <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> from four character literals.</p>
<div class="refsect3">
<a name="HB-TAG.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>c1</p></td>
<td class="parameter_description"><p>1st character of the tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>c2</p></td>
<td class="parameter_description"><p>2nd character of the tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>c3</p></td>
<td class="parameter_description"><p>3rd character of the tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>c4</p></td>
<td class="parameter_description"><p>4th character of the tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="HB-UNTAG:CAPS"></a><h3>HB_UNTAG()</h3>
<pre class="programlisting">#define HB_UNTAG(tag) (uint8_t)(((tag)>>24)&0xFF), (uint8_t)(((tag)>>16)&0xFF), (uint8_t)(((tag)>>8)&0xFF), (uint8_t)((tag)&0xFF)
</pre>
<p>Extracts four character literals from an <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a>.</p>
<div class="refsect3">
<a name="HB-UNTAG.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>an <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-tag-from-string"></a><h3>hb_tag_from_string ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="returnvalue">hb_tag_t</span></a>
hb_tag_from_string (<em class="parameter"><code>const <span class="type">char</span> *str</code></em>,
<em class="parameter"><code><span class="type">int</span> len</code></em>);</pre>
<p>Converts a string into an <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a>. Valid tags
are four characters. Shorter input strings will be
padded with spaces. Longer input strings will be
truncated.</p>
<div class="refsect3">
<a name="hb-tag-from-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>str</p></td>
<td class="parameter_description"><p>String to convert. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=len][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> uint8_t]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>len</p></td>
<td class="parameter_description"><p>Length of <em class="parameter"><code>str</code></em>
, or -1 if it is <code class="literal">NULL</code>-terminated</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-tag-from-string.returns"></a><h4>Returns</h4>
<p> The <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> corresponding to <em class="parameter"><code>str</code></em>
</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-tag-to-string"></a><h3>hb_tag_to_string ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_tag_to_string (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> tag</code></em>,
<em class="parameter"><code><span class="type">char</span> *buf</code></em>);</pre>
<p>Converts an <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> to a string and returns it in <em class="parameter"><code>buf</code></em>
.
Strings will be four characters long.</p>
<div class="refsect3">
<a name="hb-tag-to-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> to convert</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>Converted string. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> fixed-size=4][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> uint8_t]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-5.html#api-index-0.9.5">0.9.5</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-direction-from-string"></a><h3>hb_direction_from_string ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="returnvalue">hb_direction_t</span></a>
hb_direction_from_string (<em class="parameter"><code>const <span class="type">char</span> *str</code></em>,
<em class="parameter"><code><span class="type">int</span> len</code></em>);</pre>
<p>Converts a string to an <a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a>.</p>
<p>Matching is loose and applies only to the first letter. For
examples, "LTR" and "left-to-right" will both return <a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-LTR:CAPS"><span class="type">HB_DIRECTION_LTR</span></a>.</p>
<p>Unmatched strings will return <a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-INVALID:CAPS"><span class="type">HB_DIRECTION_INVALID</span></a>.</p>
<div class="refsect3">
<a name="hb-direction-from-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>str</p></td>
<td class="parameter_description"><p>String to convert. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=len][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> uint8_t]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>len</p></td>
<td class="parameter_description"><p>Length of <em class="parameter"><code>str</code></em>
, or -1 if it is <code class="literal">NULL</code>-terminated</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-direction-from-string.returns"></a><h4>Returns</h4>
<p> The <a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> matching <em class="parameter"><code>str</code></em>
</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-direction-to-string"></a><h3>hb_direction_to_string ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *
hb_direction_to_string (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>);</pre>
<p>Converts an <a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> to a string.</p>
<div class="refsect3">
<a name="hb-direction-to-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> to convert</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-direction-to-string.returns"></a><h4>Returns</h4>
<p>The string corresponding to <em class="parameter"><code>direction</code></em>
. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="HB-DIRECTION-REVERSE:CAPS"></a><h3>HB_DIRECTION_REVERSE()</h3>
<pre class="programlisting">#define HB_DIRECTION_REVERSE(dir) ((hb_direction_t) (((unsigned int) (dir)) ^ 1))
</pre>
<p>Reverses a text direction. Requires that the direction
be valid.</p>
<div class="refsect3">
<a name="HB-DIRECTION-REVERSE.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dir</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> to reverse</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="HB-DIRECTION-IS-BACKWARD:CAPS"></a><h3>HB_DIRECTION_IS_BACKWARD()</h3>
<pre class="programlisting">#define HB_DIRECTION_IS_BACKWARD(dir) ((((unsigned int) (dir)) & ~2U) == 5)
</pre>
<p>Tests whether a text direction moves backward (from right to left, or from
bottom to top). Requires that the direction be valid.</p>
<div class="refsect3">
<a name="HB-DIRECTION-IS-BACKWARD.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dir</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="HB-DIRECTION-IS-FORWARD:CAPS"></a><h3>HB_DIRECTION_IS_FORWARD()</h3>
<pre class="programlisting">#define HB_DIRECTION_IS_FORWARD(dir) ((((unsigned int) (dir)) & ~2U) == 4)
</pre>
<p>Tests whether a text direction moves forward (from left to right, or from
top to bottom). Requires that the direction be valid.</p>
<div class="refsect3">
<a name="HB-DIRECTION-IS-FORWARD.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dir</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="HB-DIRECTION-IS-HORIZONTAL:CAPS"></a><h3>HB_DIRECTION_IS_HORIZONTAL()</h3>
<pre class="programlisting">#define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int) (dir)) & ~1U) == 4)
</pre>
<p>Tests whether a text direction is horizontal. Requires
that the direction be valid.</p>
<div class="refsect3">
<a name="HB-DIRECTION-IS-HORIZONTAL.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dir</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="HB-DIRECTION-IS-VALID:CAPS"></a><h3>HB_DIRECTION_IS_VALID()</h3>
<pre class="programlisting">#define HB_DIRECTION_IS_VALID(dir) ((((unsigned int) (dir)) & ~3U) == 4)
</pre>
<p>Tests whether a text direction is valid.</p>
<div class="refsect3">
<a name="HB-DIRECTION-IS-VALID.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dir</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="HB-DIRECTION-IS-VERTICAL:CAPS"></a><h3>HB_DIRECTION_IS_VERTICAL()</h3>
<pre class="programlisting">#define HB_DIRECTION_IS_VERTICAL(dir) ((((unsigned int) (dir)) & ~1U) == 6)
</pre>
<p>Tests whether a text direction is vertical. Requires
that the direction be valid.</p>
<div class="refsect3">
<a name="HB-DIRECTION-IS-VERTICAL.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dir</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="hb-script-from-iso15924-tag"></a><h3>hb_script_from_iso15924_tag ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="returnvalue">hb_script_t</span></a>
hb_script_from_iso15924_tag (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> tag</code></em>);</pre>
<p>Converts an ISO 15924 script tag to a corresponding <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a>.</p>
<div class="refsect3">
<a name="hb-script-from-iso15924-tag.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>an <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> representing an ISO 15924 tag.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-script-from-iso15924-tag.returns"></a><h4>Returns</h4>
<p>An <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> corresponding to the ISO 15924 tag.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-script-to-iso15924-tag"></a><h3>hb_script_to_iso15924_tag ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="returnvalue">hb_tag_t</span></a>
hb_script_to_iso15924_tag (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> script</code></em>);</pre>
<p>Converts an <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> to a corresponding ISO 15924 script tag.</p>
<div class="refsect3">
<a name="hb-script-to-iso15924-tag.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>an <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> to convert.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-script-to-iso15924-tag.returns"></a><h4>Returns</h4>
<p>An <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> representing an ISO 15924 script tag.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-script-from-string"></a><h3>hb_script_from_string ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="returnvalue">hb_script_t</span></a>
hb_script_from_string (<em class="parameter"><code>const <span class="type">char</span> *str</code></em>,
<em class="parameter"><code><span class="type">int</span> len</code></em>);</pre>
<p>Converts a string <em class="parameter"><code>str</code></em>
representing an ISO 15924 script tag to a
corresponding <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a>. Shorthand for <a class="link" href="harfbuzz-hb-common.html#hb-tag-from-string" title="hb_tag_from_string ()"><code class="function">hb_tag_from_string()</code></a> then
<a class="link" href="harfbuzz-hb-common.html#hb-script-from-iso15924-tag" title="hb_script_from_iso15924_tag ()"><code class="function">hb_script_from_iso15924_tag()</code></a>.</p>
<div class="refsect3">
<a name="hb-script-from-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>str</p></td>
<td class="parameter_description"><p>a string representing an
ISO 15924 tag. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=len][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> uint8_t]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>len</p></td>
<td class="parameter_description"><p>length of the <em class="parameter"><code>str</code></em>
, or -1 if it is <code class="literal">NULL</code>-terminated.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-script-from-string.returns"></a><h4>Returns</h4>
<p>An <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> corresponding to the ISO 15924 tag.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-script-get-horizontal-direction"></a><h3>hb_script_get_horizontal_direction ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="returnvalue">hb_direction_t</span></a>
hb_script_get_horizontal_direction (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> script</code></em>);</pre>
<p>Fetches the <a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> of a script when it is
set horizontally. All right-to-left scripts will return
<a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-RTL:CAPS"><span class="type">HB_DIRECTION_RTL</span></a>. All left-to-right scripts will return
<a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-LTR:CAPS"><span class="type">HB_DIRECTION_LTR</span></a>. Scripts that can be written either
horizontally or vertically will return <a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-INVALID:CAPS"><span class="type">HB_DIRECTION_INVALID</span></a>.
Unknown scripts will return <a class="link" href="harfbuzz-hb-common.html#HB-DIRECTION-LTR:CAPS"><span class="type">HB_DIRECTION_LTR</span></a>.</p>
<div class="refsect3">
<a name="hb-script-get-horizontal-direction.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> to query</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-script-get-horizontal-direction.returns"></a><h4>Returns</h4>
<p> The horizontal <a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> of <em class="parameter"><code>script</code></em>
</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-language-from-string"></a><h3>hb_language_from_string ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="returnvalue">hb_language_t</span></a>
hb_language_from_string (<em class="parameter"><code>const <span class="type">char</span> *str</code></em>,
<em class="parameter"><code><span class="type">int</span> len</code></em>);</pre>
<p>Converts <em class="parameter"><code>str</code></em>
representing a BCP 47 language tag to the corresponding
<a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a>.</p>
<div class="refsect3">
<a name="hb-language-from-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>str</p></td>
<td class="parameter_description"><p>a string representing
a BCP 47 language tag. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=len][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> uint8_t]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>len</p></td>
<td class="parameter_description"><p>length of the <em class="parameter"><code>str</code></em>
, or -1 if it is <code class="literal">NULL</code>-terminated.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-language-from-string.returns"></a><h4>Returns</h4>
<p>The <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> corresponding to the BCP 47 language tag. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-language-to-string"></a><h3>hb_language_to_string ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *
hb_language_to_string (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> language</code></em>);</pre>
<p>Converts an <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> to a string.</p>
<div class="refsect3">
<a name="hb-language-to-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>language</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> to convert</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-language-to-string.returns"></a><h4>Returns</h4>
<p>A <code class="literal">NULL</code>-terminated string representing the <em class="parameter"><code>language</code></em>
. Must not be freed by
the caller. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-language-get-default"></a><h3>hb_language_get_default ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="returnvalue">hb_language_t</span></a>
hb_language_get_default (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Fetch the default language from current locale.</p>
<div class="note">Note that the first time this function is called, it calls
"setlocale (LC_CTYPE, nullptr)" to fetch current locale. The underlying
setlocale function is, in many implementations, NOT threadsafe. To avoid
problems, call this function once before multiple threads can call it.
This function is only used from <a class="link" href="harfbuzz-hb-buffer.html#hb-buffer-guess-segment-properties" title="hb_buffer_guess_segment_properties ()"><code class="function">hb_buffer_guess_segment_properties()</code></a> by
HarfBuzz itself.</div>
<div class="refsect3">
<a name="hb-language-get-default.returns"></a><h4>Returns</h4>
<p>The default language of the locale as
an <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a>. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-language-matches"></a><h3>hb_language_matches ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_language_matches (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> language</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> specific</code></em>);</pre>
<p>Check whether a second language tag is the same or a more
specific version of the provided language tag. For example,
"fa_IR.utf8" is a more specific tag for "fa" or for "fa_IR".</p>
<div class="refsect3">
<a name="hb-language-matches.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>language</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> to work on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>specific</p></td>
<td class="parameter_description"><p>Another <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-language-matches.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if languages match, <code class="literal">false</code> otherwise.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-5-0-0.html#api-index-5.0.0">5.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-feature-from-string"></a><h3>hb_feature_from_string ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_feature_from_string (<em class="parameter"><code>const <span class="type">char</span> *str</code></em>,
<em class="parameter"><code><span class="type">int</span> len</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-feature-t" title="hb_feature_t"><span class="type">hb_feature_t</span></a> *feature</code></em>);</pre>
<p>Parses a string into a <a class="link" href="harfbuzz-hb-common.html#hb-feature-t" title="hb_feature_t"><span class="type">hb_feature_t</span></a>.</p>
<p>The format for specifying feature strings follows. All valid CSS
font-feature-settings values other than 'normal' and the global values are
also accepted, though not documented below. CSS string escapes are not
supported.</p>
<p>The range indices refer to the positions between Unicode characters. The
position before the first character is always 0.</p>
<p>The format is Python-esque. Here is how it all works:</p>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th align="left">Syntax</th>
<th align="left">Value</th>
<th align="left">Start</th>
<th align="left">End</th>
<td class="auto-generated"> </td>
</tr></thead>
<tbody>
<tr>
<td align="left">Setting value:</td>
<td class="auto-generated"> </td>
<td class="auto-generated"> </td>
<td class="auto-generated"> </td>
<td class="auto-generated"> </td>
</tr>
<tr>
<td align="left">kern</td>
<td align="left">1</td>
<td align="left">0</td>
<td align="left">∞</td>
<td align="left">Turn feature on</td>
</tr>
<tr>
<td align="left">+kern</td>
<td align="left">1</td>
<td align="left">0</td>
<td align="left">∞</td>
<td align="left">Turn feature on</td>
</tr>
<tr>
<td align="left">-kern</td>
<td align="left">0</td>
<td align="left">0</td>
<td align="left">∞</td>
<td align="left">Turn feature off</td>
</tr>
<tr>
<td align="left">kern=0</td>
<td align="left">0</td>
<td align="left">0</td>
<td align="left">∞</td>
<td align="left">Turn feature off</td>
</tr>
<tr>
<td align="left">kern=1</td>
<td align="left">1</td>
<td align="left">0</td>
<td align="left">∞</td>
<td align="left">Turn feature on</td>
</tr>
<tr>
<td align="left">aalt=2</td>
<td align="left">2</td>
<td align="left">0</td>
<td align="left">∞</td>
<td align="left">Choose 2nd alternate</td>
</tr>
<tr>
<td align="left">Setting index:</td>
<td class="auto-generated"> </td>
<td class="auto-generated"> </td>
<td class="auto-generated"> </td>
<td class="auto-generated"> </td>