1 /***************************************************************************/
5 /* Auto-fitter hinting routines for latin script (specification). */
7 /* Copyright 2003-2007, 2009, 2011 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
16 /***************************************************************************/
28 /* the latin-specific script class */
30 AF_DECLARE_SCRIPT_CLASS(af_latin_script_class)
33 /* constants are given with units_per_em == 2048 in mind */
34 #define AF_LATIN_CONSTANT( metrics, c ) \
35 ( ( (c) * (FT_Long)( (AF_LatinMetrics)(metrics) )->units_per_em ) / 2048 )
38 /*************************************************************************/
39 /*************************************************************************/
41 /***** L A T I N G L O B A L M E T R I C S *****/
43 /*************************************************************************/
44 /*************************************************************************/
48 * The following declarations could be embedded in the file `aflatin.c';
49 * they have been made semi-public to allow alternate script hinters to
50 * re-use some of them.
54 /* Latin (global) metrics management */
58 AF_LATIN_BLUE_CAPITAL_TOP,
59 AF_LATIN_BLUE_CAPITAL_BOTTOM,
60 AF_LATIN_BLUE_SMALL_F_TOP,
61 AF_LATIN_BLUE_SMALL_TOP,
62 AF_LATIN_BLUE_SMALL_BOTTOM,
63 AF_LATIN_BLUE_SMALL_MINOR,
69 #define AF_LATIN_IS_TOP_BLUE( b ) ( (b) == AF_LATIN_BLUE_CAPITAL_TOP || \
70 (b) == AF_LATIN_BLUE_SMALL_F_TOP || \
71 (b) == AF_LATIN_BLUE_SMALL_TOP )
73 #define AF_LATIN_MAX_WIDTHS 16
74 #define AF_LATIN_MAX_BLUES AF_LATIN_BLUE_MAX
79 AF_LATIN_BLUE_ACTIVE = 1 << 0, /* set if zone height is <= 3/4px */
80 AF_LATIN_BLUE_TOP = 1 << 1, /* result of AF_LATIN_IS_TOP_BLUE */
81 AF_LATIN_BLUE_ADJUSTMENT = 1 << 2, /* used for scale adjustment */
83 AF_LATIN_BLUE_FLAG_MAX
87 typedef struct AF_LatinBlueRec_
93 } AF_LatinBlueRec, *AF_LatinBlue;
96 typedef struct AF_LatinAxisRec_
101 FT_UInt width_count; /* number of used widths */
102 AF_WidthRec widths[AF_LATIN_MAX_WIDTHS]; /* widths array */
103 FT_Pos edge_distance_threshold; /* used for creating edges */
104 FT_Pos standard_width; /* the default stem thickness */
105 FT_Bool extra_light; /* is standard width very light? */
107 /* ignored for horizontal metrics */
109 AF_LatinBlueRec blues[AF_LATIN_BLUE_MAX];
114 } AF_LatinAxisRec, *AF_LatinAxis;
117 typedef struct AF_LatinMetricsRec_
119 AF_ScriptMetricsRec root;
120 FT_UInt units_per_em;
121 AF_LatinAxisRec axis[AF_DIMENSION_MAX];
123 } AF_LatinMetricsRec, *AF_LatinMetrics;
127 af_latin_metrics_init( AF_LatinMetrics metrics,
131 af_latin_metrics_scale( AF_LatinMetrics metrics,
135 af_latin_metrics_init_widths( AF_LatinMetrics metrics,
140 af_latin_metrics_check_digits( AF_LatinMetrics metrics,
144 /*************************************************************************/
145 /*************************************************************************/
147 /***** L A T I N G L Y P H A N A L Y S I S *****/
149 /*************************************************************************/
150 /*************************************************************************/
154 AF_LATIN_HINTS_HORZ_SNAP = 1 << 0, /* enable stem width snapping */
155 AF_LATIN_HINTS_VERT_SNAP = 1 << 1, /* enable stem height snapping */
156 AF_LATIN_HINTS_STEM_ADJUST = 1 << 2, /* enable stem width/height */
158 AF_LATIN_HINTS_MONO = 1 << 3 /* indicate monochrome */
163 #define AF_LATIN_HINTS_DO_HORZ_SNAP( h ) \
164 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP )
166 #define AF_LATIN_HINTS_DO_VERT_SNAP( h ) \
167 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP )
169 #define AF_LATIN_HINTS_DO_STEM_ADJUST( h ) \
170 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST )
172 #define AF_LATIN_HINTS_DO_MONO( h ) \
173 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO )
177 * This shouldn't normally be exported. However, other scripts might
178 * like to use this function as-is.
181 af_latin_hints_compute_segments( AF_GlyphHints hints,
185 * This shouldn't normally be exported. However, other scripts might
186 * want to use this function as-is.
189 af_latin_hints_link_segments( AF_GlyphHints hints,
193 * This shouldn't normally be exported. However, other scripts might
194 * want to use this function as-is.
197 af_latin_hints_compute_edges( AF_GlyphHints hints,
201 af_latin_hints_detect_features( AF_GlyphHints hints,
208 #endif /* __AFLATIN_H__ */