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| 4349 | Serge | 1 | /***************************************************************************/ |
| 2 | /* */ |
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| 3 | /* aflatin.h */ |
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| 4 | /* */ |
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| 5 | /* Auto-fitter hinting routines for latin script (specification). */ |
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| 6 | /* */ |
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| 7 | /* Copyright 2003-2007, 2009, 2011-2012 by */ |
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| 8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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| 9 | /* */ |
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| 10 | /* This file is part of the FreeType project, and may only be used, */ |
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| 11 | /* modified, and distributed under the terms of the FreeType project */ |
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| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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| 13 | /* this file you indicate that you have read the license and */ |
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| 14 | /* understand and accept it fully. */ |
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| 15 | /* */ |
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| 16 | /***************************************************************************/ |
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| 17 | |||
| 18 | |||
| 19 | #ifndef __AFLATIN_H__ |
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| 20 | #define __AFLATIN_H__ |
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| 21 | |||
| 22 | #include "afhints.h" |
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| 23 | |||
| 24 | |||
| 25 | FT_BEGIN_HEADER |
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| 26 | |||
| 27 | |||
| 28 | /* the latin-specific script class */ |
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| 29 | |||
| 30 | AF_DECLARE_SCRIPT_CLASS( af_latin_script_class ) |
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| 31 | |||
| 32 | |||
| 33 | /* constants are given with units_per_em == 2048 in mind */ |
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| 34 | #define AF_LATIN_CONSTANT( metrics, c ) \ |
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| 35 | ( ( (c) * (FT_Long)( (AF_LatinMetrics)(metrics) )->units_per_em ) / 2048 ) |
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| 36 | |||
| 37 | |||
| 38 | /*************************************************************************/ |
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| 39 | /*************************************************************************/ |
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| 40 | /***** *****/ |
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| 41 | /***** L A T I N G L O B A L M E T R I C S *****/ |
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| 42 | /***** *****/ |
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| 43 | /*************************************************************************/ |
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| 44 | /*************************************************************************/ |
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| 45 | |||
| 46 | |||
| 47 | /* |
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| 48 | * The following declarations could be embedded in the file `aflatin.c'; |
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| 49 | * they have been made semi-public to allow alternate script hinters to |
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| 50 | * re-use some of them. |
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| 51 | */ |
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| 52 | |||
| 53 | |||
| 54 | /* Latin (global) metrics management */ |
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| 55 | |||
| 56 | enum |
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| 57 | { |
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| 58 | AF_LATIN_BLUE_CAPITAL_TOP, |
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| 59 | AF_LATIN_BLUE_CAPITAL_BOTTOM, |
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| 60 | AF_LATIN_BLUE_SMALL_F_TOP, |
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| 61 | AF_LATIN_BLUE_SMALL_TOP, |
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| 62 | AF_LATIN_BLUE_SMALL_BOTTOM, |
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| 63 | AF_LATIN_BLUE_SMALL_MINOR, |
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| 64 | |||
| 65 | AF_LATIN_BLUE_MAX |
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| 66 | }; |
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| 67 | |||
| 68 | |||
| 69 | #define AF_LATIN_IS_TOP_BLUE( b ) ( (b) == AF_LATIN_BLUE_CAPITAL_TOP || \ |
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| 70 | (b) == AF_LATIN_BLUE_SMALL_F_TOP || \ |
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| 71 | (b) == AF_LATIN_BLUE_SMALL_TOP ) |
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| 72 | |||
| 73 | #define AF_LATIN_MAX_WIDTHS 16 |
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| 74 | #define AF_LATIN_MAX_BLUES AF_LATIN_BLUE_MAX |
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| 75 | |||
| 76 | |||
| 77 | enum |
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| 78 | { |
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| 79 | AF_LATIN_BLUE_ACTIVE = 1 << 0, /* set if zone height is <= 3/4px */ |
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| 80 | AF_LATIN_BLUE_TOP = 1 << 1, /* result of AF_LATIN_IS_TOP_BLUE */ |
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| 81 | AF_LATIN_BLUE_ADJUSTMENT = 1 << 2, /* used for scale adjustment */ |
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| 82 | /* optimization */ |
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| 83 | AF_LATIN_BLUE_FLAG_MAX |
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| 84 | }; |
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| 85 | |||
| 86 | |||
| 87 | typedef struct AF_LatinBlueRec_ |
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| 88 | { |
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| 89 | AF_WidthRec ref; |
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| 90 | AF_WidthRec shoot; |
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| 91 | FT_UInt flags; |
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| 92 | |||
| 93 | } AF_LatinBlueRec, *AF_LatinBlue; |
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| 94 | |||
| 95 | |||
| 96 | typedef struct AF_LatinAxisRec_ |
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| 97 | { |
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| 98 | FT_Fixed scale; |
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| 99 | FT_Pos delta; |
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| 100 | |||
| 101 | FT_UInt width_count; /* number of used widths */ |
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| 102 | AF_WidthRec widths[AF_LATIN_MAX_WIDTHS]; /* widths array */ |
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| 103 | FT_Pos edge_distance_threshold; /* used for creating edges */ |
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| 104 | FT_Pos standard_width; /* the default stem thickness */ |
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| 105 | FT_Bool extra_light; /* is standard width very light? */ |
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| 106 | |||
| 107 | /* ignored for horizontal metrics */ |
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| 108 | FT_UInt blue_count; |
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| 109 | AF_LatinBlueRec blues[AF_LATIN_BLUE_MAX]; |
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| 110 | |||
| 111 | FT_Fixed org_scale; |
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| 112 | FT_Pos org_delta; |
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| 113 | |||
| 114 | } AF_LatinAxisRec, *AF_LatinAxis; |
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| 115 | |||
| 116 | |||
| 117 | typedef struct AF_LatinMetricsRec_ |
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| 118 | { |
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| 119 | AF_ScriptMetricsRec root; |
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| 120 | FT_UInt units_per_em; |
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| 121 | AF_LatinAxisRec axis[AF_DIMENSION_MAX]; |
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| 122 | |||
| 123 | } AF_LatinMetricsRec, *AF_LatinMetrics; |
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| 124 | |||
| 125 | |||
| 126 | FT_LOCAL( FT_Error ) |
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| 127 | af_latin_metrics_init( AF_LatinMetrics metrics, |
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| 128 | FT_Face face ); |
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| 129 | |||
| 130 | FT_LOCAL( void ) |
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| 131 | af_latin_metrics_scale( AF_LatinMetrics metrics, |
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| 132 | AF_Scaler scaler ); |
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| 133 | |||
| 134 | FT_LOCAL( void ) |
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| 135 | af_latin_metrics_init_widths( AF_LatinMetrics metrics, |
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| 136 | FT_Face face ); |
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| 137 | |||
| 138 | FT_LOCAL( void ) |
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| 139 | af_latin_metrics_check_digits( AF_LatinMetrics metrics, |
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| 140 | FT_Face face ); |
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| 141 | |||
| 142 | |||
| 143 | /*************************************************************************/ |
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| 144 | /*************************************************************************/ |
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| 145 | /***** *****/ |
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| 146 | /***** L A T I N G L Y P H A N A L Y S I S *****/ |
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| 147 | /***** *****/ |
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| 148 | /*************************************************************************/ |
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| 149 | /*************************************************************************/ |
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| 150 | |||
| 151 | enum |
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| 152 | { |
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| 153 | AF_LATIN_HINTS_HORZ_SNAP = 1 << 0, /* enable stem width snapping */ |
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| 154 | AF_LATIN_HINTS_VERT_SNAP = 1 << 1, /* enable stem height snapping */ |
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| 155 | AF_LATIN_HINTS_STEM_ADJUST = 1 << 2, /* enable stem width/height */ |
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| 156 | /* adjustment */ |
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| 157 | AF_LATIN_HINTS_MONO = 1 << 3 /* indicate monochrome */ |
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| 158 | /* rendering */ |
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| 159 | }; |
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| 160 | |||
| 161 | |||
| 162 | #define AF_LATIN_HINTS_DO_HORZ_SNAP( h ) \ |
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| 163 | AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP ) |
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| 164 | |||
| 165 | #define AF_LATIN_HINTS_DO_VERT_SNAP( h ) \ |
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| 166 | AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP ) |
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| 167 | |||
| 168 | #define AF_LATIN_HINTS_DO_STEM_ADJUST( h ) \ |
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| 169 | AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST ) |
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| 170 | |||
| 171 | #define AF_LATIN_HINTS_DO_MONO( h ) \ |
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| 172 | AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO ) |
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| 173 | |||
| 174 | |||
| 175 | /* |
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| 176 | * The next functions shouldn't normally be exported. However, other |
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| 177 | * scripts might like to use these functions as-is. |
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| 178 | */ |
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| 179 | FT_LOCAL( FT_Error ) |
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| 180 | af_latin_hints_compute_segments( AF_GlyphHints hints, |
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| 181 | AF_Dimension dim ); |
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| 182 | |||
| 183 | FT_LOCAL( void ) |
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| 184 | af_latin_hints_link_segments( AF_GlyphHints hints, |
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| 185 | AF_Dimension dim ); |
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| 186 | |||
| 187 | FT_LOCAL( FT_Error ) |
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| 188 | af_latin_hints_compute_edges( AF_GlyphHints hints, |
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| 189 | AF_Dimension dim ); |
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| 190 | |||
| 191 | FT_LOCAL( FT_Error ) |
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| 192 | af_latin_hints_detect_features( AF_GlyphHints hints, |
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| 193 | AF_Dimension dim ); |
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| 194 | |||
| 195 | /* */ |
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| 196 | |||
| 197 | FT_END_HEADER |
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| 198 | |||
| 199 | #endif /* __AFLATIN_H__ */ |
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| 200 | |||
| 201 | |||
| 202 | /* END */ |