1 /***************************************************************************/ 2 /* */ 3 /* aflatin.h */ 4 /* */ 5 /* Auto-fitter hinting routines for latin writing system */ 6 /* (specification). */ 7 /* */ 8 /* Copyright 2003-2015 by */ 9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 10 /* */ 11 /* This file is part of the FreeType project, and may only be used, */ 12 /* modified, and distributed under the terms of the FreeType project */ 13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 14 /* this file you indicate that you have read the license and */ 15 /* understand and accept it fully. */ 16 /* */ 17 /***************************************************************************/ 18 19 20 #ifndef __AFLATIN_H__ 21 #define __AFLATIN_H__ 22 23 #include "afhints.h" 24 25 26 FT_BEGIN_HEADER 27 28 /* the `latin' writing system */ 29 30 AF_DECLARE_WRITING_SYSTEM_CLASS( af_latin_writing_system_class ) 31 32 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 ) 36 37 38 /*************************************************************************/ 39 /*************************************************************************/ 40 /***** *****/ 41 /***** L A T I N G L O B A L M E T R I C S *****/ 42 /***** *****/ 43 /*************************************************************************/ 44 /*************************************************************************/ 45 46 47 /* 48 * The following declarations could be embedded in the file `aflatin.c'; 49 * they have been made semi-public to allow alternate writing system 50 * hinters to re-use some of them. 51 */ 52 53 54 #define AF_LATIN_IS_TOP_BLUE( b ) \ 55 ( (b)->properties & AF_BLUE_PROPERTY_LATIN_TOP ) 56 #define AF_LATIN_IS_NEUTRAL_BLUE( b ) \ 57 ( (b)->properties & AF_BLUE_PROPERTY_LATIN_NEUTRAL ) 58 #define AF_LATIN_IS_X_HEIGHT_BLUE( b ) \ 59 ( (b)->properties & AF_BLUE_PROPERTY_LATIN_X_HEIGHT ) 60 #define AF_LATIN_IS_LONG_BLUE( b ) \ 61 ( (b)->properties & AF_BLUE_PROPERTY_LATIN_LONG ) 62 63 #define AF_LATIN_MAX_WIDTHS 16 64 65 66 #define AF_LATIN_BLUE_ACTIVE ( 1U << 0 ) /* zone height is <= 3/4px */ 67 #define AF_LATIN_BLUE_TOP ( 1U << 1 ) /* we have a top blue zone */ 68 #define AF_LATIN_BLUE_NEUTRAL ( 1U << 2 ) /* we have neutral blue zone */ 69 #define AF_LATIN_BLUE_ADJUSTMENT ( 1U << 3 ) /* used for scale adjustment */ 70 /* optimization */ 71 72 73 typedef struct AF_LatinBlueRec_ 74 { 75 AF_WidthRec ref; 76 AF_WidthRec shoot; 77 FT_UInt flags; 78 79 } AF_LatinBlueRec, *AF_LatinBlue; 80 81 82 typedef struct AF_LatinAxisRec_ 83 { 84 FT_Fixed scale; 85 FT_Pos delta; 86 87 FT_UInt width_count; /* number of used widths */ 88 AF_WidthRec widths[AF_LATIN_MAX_WIDTHS]; /* widths array */ 89 FT_Pos edge_distance_threshold; /* used for creating edges */ 90 FT_Pos standard_width; /* the default stem thickness */ 91 FT_Bool extra_light; /* is standard width very light? */ 92 93 /* ignored for horizontal metrics */ 94 FT_UInt blue_count; 95 AF_LatinBlueRec blues[AF_BLUE_STRINGSET_MAX]; 96 97 FT_Fixed org_scale; 98 FT_Pos org_delta; 99 100 } AF_LatinAxisRec, *AF_LatinAxis; 101 102 103 typedef struct AF_LatinMetricsRec_ 104 { 105 AF_StyleMetricsRec root; 106 FT_UInt units_per_em; 107 AF_LatinAxisRec axis[AF_DIMENSION_MAX]; 108 109 } AF_LatinMetricsRec, *AF_LatinMetrics; 110 111 112 FT_LOCAL( FT_Error ) 113 af_latin_metrics_init( AF_LatinMetrics metrics, 114 FT_Face face ); 115 116 FT_LOCAL( void ) 117 af_latin_metrics_scale( AF_LatinMetrics metrics, 118 AF_Scaler scaler ); 119 120 FT_LOCAL( void ) 121 af_latin_metrics_init_widths( AF_LatinMetrics metrics, 122 FT_Face face ); 123 124 FT_LOCAL( void ) 125 af_latin_metrics_check_digits( AF_LatinMetrics metrics, 126 FT_Face face ); 127 128 129 /*************************************************************************/ 130 /*************************************************************************/ 131 /***** *****/ 132 /***** L A T I N G L Y P H A N A L Y S I S *****/ 133 /***** *****/ 134 /*************************************************************************/ 135 /*************************************************************************/ 136 137 #define AF_LATIN_HINTS_HORZ_SNAP ( 1U << 0 ) /* stem width snapping */ 138 #define AF_LATIN_HINTS_VERT_SNAP ( 1U << 1 ) /* stem height snapping */ 139 #define AF_LATIN_HINTS_STEM_ADJUST ( 1U << 2 ) /* stem width/height */ 140 /* adjustment */ 141 #define AF_LATIN_HINTS_MONO ( 1U << 3 ) /* monochrome rendering */ 142 143 144 #define AF_LATIN_HINTS_DO_HORZ_SNAP( h ) \ 145 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP ) 146 147 #define AF_LATIN_HINTS_DO_VERT_SNAP( h ) \ 148 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP ) 149 150 #define AF_LATIN_HINTS_DO_STEM_ADJUST( h ) \ 151 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST ) 152 153 #define AF_LATIN_HINTS_DO_MONO( h ) \ 154 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO ) 155 156 157 /* 158 * The next functions shouldn't normally be exported. However, other 159 * writing systems might like to use these functions as-is. 160 */ 161 FT_LOCAL( FT_Error ) 162 af_latin_hints_compute_segments( AF_GlyphHints hints, 163 AF_Dimension dim ); 164 165 FT_LOCAL( void ) 166 af_latin_hints_link_segments( AF_GlyphHints hints, 167 FT_UInt width_count, 168 AF_WidthRec* widths, 169 AF_Dimension dim ); 170 171 FT_LOCAL( FT_Error ) 172 af_latin_hints_compute_edges( AF_GlyphHints hints, 173 AF_Dimension dim ); 174 175 FT_LOCAL( FT_Error ) 176 af_latin_hints_detect_features( AF_GlyphHints hints, 177 FT_UInt width_count, 178 AF_WidthRec* widths, 179 AF_Dimension dim ); 180 181 /* */ 182 183 FT_END_HEADER 184 185 #endif /* __AFLATIN_H__ */ 186 187 188 /* END */ 189