1/****************************************************************************
2 *
3 * afindic.c
4 *
5 * Auto-fitter hinting routines for Indic writing system (body).
6 *
7 * Copyright (C) 2007-2023 by
8 * Rahul Bhalerao <rahul.bhalerao@redhat.com>, <b.rahul.pm@gmail.com>.
9 *
10 * This file is part of the FreeType project, and may only be used,
11 * modified, and distributed under the terms of the FreeType project
12 * license, LICENSE.TXT. By continuing to use, modify, or distribute
13 * this file you indicate that you have read the license and
14 * understand and accept it fully.
15 *
16 */
17
18
19#include "aftypes.h"
20#include "aflatin.h"
21#include "afcjk.h"
22
23
24#ifdef AF_CONFIG_OPTION_INDIC
25
26#include "afindic.h"
27#include "aferrors.h"
28
29
30 static FT_Error
31 af_indic_metrics_init( AF_StyleMetrics metrics_, /* AF_CJKMetrics */
32 FT_Face face )
33 {
34 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
35
36
37 /* skip blue zone init in CJK routines */
38 FT_CharMap oldmap = face->charmap;
39
40
41 metrics->units_per_em = face->units_per_EM;
42
43 if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
44 face->charmap = NULL;
45 else
46 {
47 af_cjk_metrics_init_widths( metrics, face );
48#if 0
49 /* either need indic specific blue_chars[] or just skip blue zones */
50 af_cjk_metrics_init_blues( metrics, face, af_cjk_blue_chars );
51#endif
52 af_cjk_metrics_check_digits( metrics, face );
53 }
54
55 face->charmap = oldmap;
56 return FT_Err_Ok;
57 }
58
59
60 static void
61 af_indic_metrics_scale( AF_StyleMetrics metrics,
62 AF_Scaler scaler )
63 {
64 /* use CJK routines */
65 af_cjk_metrics_scale( metrics, scaler );
66 }
67
68
69 static FT_Error
70 af_indic_hints_init( AF_GlyphHints hints,
71 AF_StyleMetrics metrics )
72 {
73 /* use CJK routines */
74 return af_cjk_hints_init( hints, metrics );
75 }
76
77
78 static FT_Error
79 af_indic_hints_apply( FT_UInt glyph_index,
80 AF_GlyphHints hints,
81 FT_Outline* outline,
82 AF_StyleMetrics metrics )
83 {
84 /* use CJK routines */
85 return af_cjk_hints_apply( glyph_index, hints, outline, metrics );
86 }
87
88
89 /* Extract standard_width from writing system/script specific */
90 /* metrics class. */
91
92 static void
93 af_indic_get_standard_widths( AF_StyleMetrics metrics_, /* AF_CJKMetrics */
94 FT_Pos* stdHW,
95 FT_Pos* stdVW )
96 {
97 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
98
99
100 if ( stdHW )
101 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
102
103 if ( stdVW )
104 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
105 }
106
107
108 /*************************************************************************/
109 /*************************************************************************/
110 /***** *****/
111 /***** I N D I C S C R I P T C L A S S *****/
112 /***** *****/
113 /*************************************************************************/
114 /*************************************************************************/
115
116
117 AF_DEFINE_WRITING_SYSTEM_CLASS(
118 af_indic_writing_system_class,
119
120 AF_WRITING_SYSTEM_INDIC,
121
122 sizeof ( AF_CJKMetricsRec ),
123
124 (AF_WritingSystem_InitMetricsFunc) af_indic_metrics_init, /* style_metrics_init */
125 (AF_WritingSystem_ScaleMetricsFunc)af_indic_metrics_scale, /* style_metrics_scale */
126 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
127 (AF_WritingSystem_GetStdWidthsFunc)af_indic_get_standard_widths, /* style_metrics_getstdw */
128
129 (AF_WritingSystem_InitHintsFunc) af_indic_hints_init, /* style_hints_init */
130 (AF_WritingSystem_ApplyHintsFunc) af_indic_hints_apply /* style_hints_apply */
131 )
132
133
134#else /* !AF_CONFIG_OPTION_INDIC */
135
136
137 AF_DEFINE_WRITING_SYSTEM_CLASS(
138 af_indic_writing_system_class,
139
140 AF_WRITING_SYSTEM_INDIC,
141
142 sizeof ( AF_CJKMetricsRec ),
143
144 (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init */
145 (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale */
146 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
147 (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */
148
149 (AF_WritingSystem_InitHintsFunc) NULL, /* style_hints_init */
150 (AF_WritingSystem_ApplyHintsFunc) NULL /* style_hints_apply */
151 )
152
153
154#endif /* !AF_CONFIG_OPTION_INDIC */
155
156
157/* END */
158