4 * Copyright (C) 2011 by Werner Lemberg.
6 * This file is part of the ttfautohint library, and may only be used,
7 * modified, and distributed under the terms given in `COPYING'. By
8 * continuing to use, modify, or distribute this file you indicate that you
9 * have read `COPYING' and understand and accept it fully.
11 * The file `COPYING' mentioned in the previous paragraph is distributed
12 * with the ttfautohint library.
16 /* originally file `aflatin.h' (2011-Mar-28) from FreeType */
18 /* heavily modified 2011 by Werner Lemberg <wl@gnu.org> */
27 /* the latin-specific script class */
29 extern const TA_ScriptClassRec ta_latin_script_class
;
32 /* constants are given with units_per_em == 2048 in mind */
33 #define TA_LATIN_CONSTANT(metrics, c) \
34 (((c) * (FT_Long)((TA_LatinMetrics)(metrics))->units_per_em) / 2048)
37 /* Latin (global) metrics management */
41 TA_LATIN_BLUE_CAPITAL_TOP
,
42 TA_LATIN_BLUE_CAPITAL_BOTTOM
,
43 TA_LATIN_BLUE_SMALL_F_TOP
,
44 TA_LATIN_BLUE_SMALL_TOP
,
45 TA_LATIN_BLUE_SMALL_BOTTOM
,
46 TA_LATIN_BLUE_SMALL_MINOR
,
52 #define TA_LATIN_IS_TOP_BLUE(b) \
53 ((b) == TA_LATIN_BLUE_CAPITAL_TOP \
54 || (b) == TA_LATIN_BLUE_SMALL_F_TOP \
55 || (b) == TA_LATIN_BLUE_SMALL_TOP)
57 #define TA_LATIN_MAX_WIDTHS 16
58 #define TA_LATIN_MAX_BLUES TA_LATIN_BLUE_MAX
61 #define TA_LATIN_BLUE_ACTIVE (1 << 0) /* set if zone height is <= 3/4px */
62 #define TA_LATIN_BLUE_TOP (1 << 1) /* result of TA_LATIN_IS_TOP_BLUE */
63 #define TA_LATIN_BLUE_ADJUSTMENT (1 << 2) /* used for scale adjustment */
67 typedef struct TA_LatinBlueRec_
72 } TA_LatinBlueRec
, *TA_LatinBlue
;
75 typedef struct TA_LatinAxisRec_
80 FT_UInt width_count
; /* number of used widths */
81 TA_WidthRec widths
[TA_LATIN_MAX_WIDTHS
]; /* widths array */
82 FT_Pos edge_distance_threshold
; /* used for creating edges */
83 FT_Pos standard_width
; /* the default stem thickness */
84 FT_Bool extra_light
; /* is standard width very light? */
86 /* ignored for horizontal metrics */
88 TA_LatinBlueRec blues
[TA_LATIN_BLUE_MAX
];
92 } TA_LatinAxisRec
, *TA_LatinAxis
;
95 typedef struct TA_LatinMetricsRec_
97 TA_ScriptMetricsRec root
;
99 TA_LatinAxisRec axis
[TA_DIMENSION_MAX
];
100 } TA_LatinMetricsRec
, *TA_LatinMetrics
;
104 ta_latin_metrics_init(TA_LatinMetrics metrics
,
108 ta_latin_metrics_scale(TA_LatinMetrics metrics
,
112 ta_latin_metrics_init_widths(TA_LatinMetrics metrics
,
117 ta_latin_metrics_check_digits(TA_LatinMetrics metrics
,
121 #define TA_LATIN_HINTS_HORZ_SNAP (1 << 0) /* enable stem width snapping */
122 #define TA_LATIN_HINTS_VERT_SNAP (1 << 1) /* enable stem height snapping */
123 #define TA_LATIN_HINTS_STEM_ADJUST (1 << 2) /* enable stem width/height */
125 #define TA_LATIN_HINTS_MONO (1 << 3) /* indicate monochrome rendering */
128 #define TA_LATIN_HINTS_DO_HORZ_SNAP(h) \
129 TA_HINTS_TEST_OTHER(h, TA_LATIN_HINTS_HORZ_SNAP)
130 #define TA_LATIN_HINTS_DO_VERT_SNAP(h) \
131 TA_HINTS_TEST_OTHER(h, TA_LATIN_HINTS_VERT_SNAP)
132 #define TA_LATIN_HINTS_DO_STEM_ADJUST(h) \
133 TA_HINTS_TEST_OTHER(h, TA_LATIN_HINTS_STEM_ADJUST)
134 #define TA_LATIN_HINTS_DO_MONO(h) \
135 TA_HINTS_TEST_OTHER(h, TA_LATIN_HINTS_MONO)
138 /* the next functions shouldn't normally be exported; */
139 /* however, other scripts might like to use these functions as-is */
142 ta_latin_hints_compute_segments(TA_GlyphHints hints
,
145 ta_latin_hints_link_segments(TA_GlyphHints hints
,
148 ta_latin_hints_compute_edges(TA_GlyphHints hints
,
151 ta_latin_hints_detect_features(TA_GlyphHints hints
,
154 #endif /* __TALATIN_H__ */
156 /* end of talatin.h */