summaryrefslogtreecommitdiffstats
path: root/src/3rdparty/freetype/src/autofit/aflatin.h
blob: 40479538c25df922e6e14e11feeb9d27840a1082 (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
/****************************************************************************
 *
 * aflatin.h
 *
 *   Auto-fitter hinting routines for latin writing system
 *   (specification).
 *
 * Copyright (C) 2003-2019 by
 * David Turner, Robert Wilhelm, and Werner Lemberg.
 *
 * This file is part of the FreeType project, and may only be used,
 * modified, and distributed under the terms of the FreeType project
 * license, LICENSE.TXT.  By continuing to use, modify, or distribute
 * this file you indicate that you have read the license and
 * understand and accept it fully.
 *
 */


#ifndef AFLATIN_H_
#define AFLATIN_H_

#include "afhints.h"


FT_BEGIN_HEADER

  /* the `latin' writing system */

  AF_DECLARE_WRITING_SYSTEM_CLASS( af_latin_writing_system_class )


  /* constants are given with units_per_em == 2048 in mind */
#define AF_LATIN_CONSTANT( metrics, c )                                      \
  ( ( (c) * (FT_Long)( (AF_LatinMetrics)(metrics) )->units_per_em ) / 2048 )


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****            L A T I N   G L O B A L   M E T R I C S            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  /*
   * The following declarations could be embedded in the file `aflatin.c';
   * they have been made semi-public to allow alternate writing system
   * hinters to re-use some of them.
   */


#define AF_LATIN_IS_TOP_BLUE( b ) \
          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_TOP )
#define AF_LATIN_IS_SUB_TOP_BLUE( b ) \
          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_SUB_TOP )
#define AF_LATIN_IS_NEUTRAL_BLUE( b ) \
          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_NEUTRAL )
#define AF_LATIN_IS_X_HEIGHT_BLUE( b ) \
          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_X_HEIGHT )
#define AF_LATIN_IS_LONG_BLUE( b ) \
          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_LONG )

#define AF_LATIN_MAX_WIDTHS  16


#define AF_LATIN_BLUE_ACTIVE      ( 1U << 0 ) /* zone height is <= 3/4px   */
#define AF_LATIN_BLUE_TOP         ( 1U << 1 ) /* we have a top blue zone   */
#define AF_LATIN_BLUE_SUB_TOP     ( 1U << 2 ) /* we have a subscript top   */
                                              /* blue zone                 */
#define AF_LATIN_BLUE_NEUTRAL     ( 1U << 3 ) /* we have neutral blue zone */
#define AF_LATIN_BLUE_ADJUSTMENT  ( 1U << 4 ) /* used for scale adjustment */
                                              /* optimization              */


  typedef struct  AF_LatinBlueRec_
  {
    AF_WidthRec  ref;
    AF_WidthRec  shoot;
    FT_Pos       ascender;
    FT_Pos       descender;
    FT_UInt      flags;

  } AF_LatinBlueRec, *AF_LatinBlue;


  typedef struct  AF_LatinAxisRec_
  {
    FT_Fixed         scale;
    FT_Pos           delta;

    FT_UInt          width_count;                 /* number of used widths */
    AF_WidthRec      widths[AF_LATIN_MAX_WIDTHS]; /* widths array          */
    FT_Pos           edge_distance_threshold;   /* used for creating edges */
    FT_Pos           standard_width;         /* the default stem thickness */
    FT_Bool          extra_light;         /* is standard width very light? */

    /* ignored for horizontal metrics */
    FT_UInt          blue_count;
    AF_LatinBlueRec  blues[AF_BLUE_STRINGSET_MAX];

    FT_Fixed         org_scale;
    FT_Pos           org_delta;

  } AF_LatinAxisRec, *AF_LatinAxis;


  typedef struct  AF_LatinMetricsRec_
  {
    AF_StyleMetricsRec  root;
    FT_UInt             units_per_em;
    AF_LatinAxisRec     axis[AF_DIMENSION_MAX];

  } AF_LatinMetricsRec, *AF_LatinMetrics;


  FT_LOCAL( FT_Error )
  af_latin_metrics_init( AF_LatinMetrics  metrics,
                         FT_Face          face );

  FT_LOCAL( void )
  af_latin_metrics_scale( AF_LatinMetrics  metrics,
                          AF_Scaler        scaler );

  FT_LOCAL( void )
  af_latin_metrics_init_widths( AF_LatinMetrics  metrics,
                                FT_Face          face );

  FT_LOCAL( void )
  af_latin_metrics_check_digits( AF_LatinMetrics  metrics,
                                 FT_Face          face );


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****           L A T I N   G L Y P H   A N A L Y S I S             *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

#define AF_LATIN_HINTS_HORZ_SNAP    ( 1U << 0 ) /* stem width snapping  */
#define AF_LATIN_HINTS_VERT_SNAP    ( 1U << 1 ) /* stem height snapping */
#define AF_LATIN_HINTS_STEM_ADJUST  ( 1U << 2 ) /* stem width/height    */
                                                /* adjustment           */
#define AF_LATIN_HINTS_MONO         ( 1U << 3 ) /* monochrome rendering */


#define AF_LATIN_HINTS_DO_HORZ_SNAP( h )             \
  AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP )

#define AF_LATIN_HINTS_DO_VERT_SNAP( h )             \
  AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP )

#define AF_LATIN_HINTS_DO_STEM_ADJUST( h )             \
  AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST )

#define AF_LATIN_HINTS_DO_MONO( h )             \
  AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO )


  /*
   * The next functions shouldn't normally be exported.  However, other
   * writing systems might like to use these functions as-is.
   */
  FT_LOCAL( FT_Error )
  af_latin_hints_compute_segments( AF_GlyphHints  hints,
                                   AF_Dimension   dim );

  FT_LOCAL( void )
  af_latin_hints_link_segments( AF_GlyphHints  hints,
                                FT_UInt        width_count,
                                AF_WidthRec*   widths,
                                AF_Dimension   dim );

  FT_LOCAL( FT_Error )
  af_latin_hints_compute_edges( AF_GlyphHints  hints,
                                AF_Dimension   dim );

  FT_LOCAL( FT_Error )
  af_latin_hints_detect_features( AF_GlyphHints  hints,
                                  FT_UInt        width_count,
                                  AF_WidthRec*   widths,
                                  AF_Dimension   dim );

/* */

FT_END_HEADER

#endif /* AFLATIN_H_ */


/* END */