1 /***************************************************************************/ |
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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 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 |
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18 |
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19 #ifndef __AFLATIN_H__ |
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20 #define __AFLATIN_H__ |
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21 |
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22 #include "afhints.h" |
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23 |
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24 |
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25 FT_BEGIN_HEADER |
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26 |
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27 |
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28 /* the latin-specific script class */ |
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29 |
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30 AF_DECLARE_SCRIPT_CLASS(af_latin_script_class) |
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31 |
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32 |
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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 |
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37 |
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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 |
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46 |
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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 |
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53 |
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54 /* Latin (global) metrics management */ |
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55 |
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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 |
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65 AF_LATIN_BLUE_MAX |
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66 }; |
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67 |
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68 |
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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 |
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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 |
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76 |
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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 |
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86 |
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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 |
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93 } AF_LatinBlueRec, *AF_LatinBlue; |
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94 |
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95 |
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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 |
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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 |
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107 /* ignored for horizontal metrics */ |
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108 FT_Bool control_overshoot; |
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109 FT_UInt blue_count; |
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110 AF_LatinBlueRec blues[AF_LATIN_BLUE_MAX]; |
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111 |
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112 FT_Fixed org_scale; |
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113 FT_Pos org_delta; |
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114 |
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115 } AF_LatinAxisRec, *AF_LatinAxis; |
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116 |
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117 |
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118 typedef struct AF_LatinMetricsRec_ |
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119 { |
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120 AF_ScriptMetricsRec root; |
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121 FT_UInt units_per_em; |
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122 AF_LatinAxisRec axis[AF_DIMENSION_MAX]; |
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123 |
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124 } AF_LatinMetricsRec, *AF_LatinMetrics; |
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125 |
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126 |
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127 FT_LOCAL( FT_Error ) |
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128 af_latin_metrics_init( AF_LatinMetrics metrics, |
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129 FT_Face face ); |
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130 |
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131 FT_LOCAL( void ) |
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132 af_latin_metrics_scale( AF_LatinMetrics metrics, |
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133 AF_Scaler scaler ); |
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134 |
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135 FT_LOCAL( void ) |
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136 af_latin_metrics_init_widths( AF_LatinMetrics metrics, |
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137 FT_Face face, |
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138 FT_ULong charcode ); |
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139 |
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140 FT_LOCAL( void ) |
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141 af_latin_metrics_check_digits( AF_LatinMetrics metrics, |
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142 FT_Face face ); |
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143 |
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144 |
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145 /*************************************************************************/ |
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146 /*************************************************************************/ |
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147 /***** *****/ |
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148 /***** L A T I N G L Y P H A N A L Y S I S *****/ |
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149 /***** *****/ |
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150 /*************************************************************************/ |
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151 /*************************************************************************/ |
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152 |
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153 enum |
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154 { |
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155 AF_LATIN_HINTS_HORZ_SNAP = 1 << 0, /* enable stem width snapping */ |
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156 AF_LATIN_HINTS_VERT_SNAP = 1 << 1, /* enable stem height snapping */ |
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157 AF_LATIN_HINTS_STEM_ADJUST = 1 << 2, /* enable stem width/height */ |
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158 /* adjustment */ |
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159 AF_LATIN_HINTS_MONO = 1 << 3 /* indicate monochrome */ |
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160 /* rendering */ |
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161 }; |
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162 |
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163 |
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164 #define AF_LATIN_HINTS_DO_HORZ_SNAP( h ) \ |
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165 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP ) |
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166 |
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167 #define AF_LATIN_HINTS_DO_VERT_SNAP( h ) \ |
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168 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP ) |
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169 |
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170 #define AF_LATIN_HINTS_DO_STEM_ADJUST( h ) \ |
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171 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST ) |
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172 |
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173 #define AF_LATIN_HINTS_DO_MONO( h ) \ |
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174 AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO ) |
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175 |
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176 |
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177 /* |
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178 * This shouldn't normally be exported. However, other scripts might |
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179 * like to use this function as-is. |
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180 */ |
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181 FT_LOCAL( FT_Error ) |
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182 af_latin_hints_compute_segments( AF_GlyphHints hints, |
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183 AF_Dimension dim ); |
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184 |
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185 /* |
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186 * This shouldn't normally be exported. However, other scripts might |
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187 * want to use this function as-is. |
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188 */ |
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189 FT_LOCAL( void ) |
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190 af_latin_hints_link_segments( AF_GlyphHints hints, |
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191 AF_Dimension dim ); |
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192 |
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193 /* |
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194 * This shouldn't normally be exported. However, other scripts might |
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195 * want to use this function as-is. |
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196 */ |
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197 FT_LOCAL( FT_Error ) |
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198 af_latin_hints_compute_edges( AF_GlyphHints hints, |
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199 AF_Dimension dim ); |
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200 |
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201 FT_LOCAL( FT_Error ) |
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202 af_latin_hints_detect_features( AF_GlyphHints hints, |
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203 AF_Dimension dim ); |
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204 |
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205 /* */ |
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206 |
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207 FT_END_HEADER |
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208 |
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209 #endif /* __AFLATIN_H__ */ |
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210 |
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211 |
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212 /* END */ |
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