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4973 | right-hear | 1 | /******************************************************************* |
2 | * |
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3 | * ttcmap.h 1.0 |
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4 | * |
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5 | * TrueType Character Mappings |
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6 | * |
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7 | * Copyright 1996-1999 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 | |||
19 | #ifndef TTCMAP_H |
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20 | #define TTCMAP_H |
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21 | |||
22 | #include "ttconfig.h" |
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23 | #include "tttypes.h" |
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24 | |||
25 | |||
26 | #ifdef __cplusplus |
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27 | extern "C" { |
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28 | #endif |
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29 | |||
30 | /* format 0 */ |
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31 | |||
32 | struct TCMap0_ |
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33 | { |
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34 | PByte glyphIdArray; |
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35 | }; |
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36 | |||
37 | typedef struct TCMap0_ TCMap0; |
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38 | typedef TCMap0* PCMap0; |
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39 | |||
40 | |||
41 | /* format 2 */ |
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42 | |||
43 | struct TCMap2SubHeader_ |
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44 | { |
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45 | UShort firstCode; /* first valid low byte */ |
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46 | UShort entryCount; /* number of valid low bytes */ |
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47 | Short idDelta; /* delta value to glyphIndex */ |
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48 | UShort idRangeOffset; /* offset from here to 1st code */ |
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49 | }; |
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50 | |||
51 | typedef struct TCMap2SubHeader_ TCMap2SubHeader; |
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52 | typedef TCMap2SubHeader* PCMap2SubHeader; |
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53 | |||
54 | struct TCMap2_ |
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55 | { |
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56 | PUShort subHeaderKeys; |
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57 | /* high byte mapping table */ |
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58 | /* value = subHeader index * 8 */ |
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59 | |||
60 | PCMap2SubHeader subHeaders; |
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61 | PUShort glyphIdArray; |
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62 | UShort numGlyphId; /* control value */ |
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63 | }; |
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64 | |||
65 | typedef struct TCMap2_ TCMap2; |
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66 | typedef TCMap2* PCMap2; |
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67 | |||
68 | |||
69 | /* format 4 */ |
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70 | |||
71 | struct TCMap4Segment_ |
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72 | { |
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73 | UShort endCount; |
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74 | UShort startCount; |
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75 | Short idDelta; /* in the specs defined as UShort but the |
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76 | example there gives negative values... */ |
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77 | UShort idRangeOffset; |
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78 | }; |
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79 | |||
80 | typedef struct TCMap4Segment_ TCMap4Segment; |
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81 | typedef TCMap4Segment* PCMap4Segment; |
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82 | |||
83 | struct TCMap4_ |
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84 | { |
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85 | UShort segCountX2; /* number of segments * 2 */ |
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86 | UShort searchRange; /* these parameters can be used */ |
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87 | UShort entrySelector; /* for a binary search */ |
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88 | UShort rangeShift; |
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89 | |||
90 | PCMap4Segment segments; |
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91 | PUShort glyphIdArray; |
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92 | UShort numGlyphId; /* control value */ |
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93 | }; |
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94 | |||
95 | typedef struct TCMap4_ TCMap4; |
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96 | typedef TCMap4* PCMap4; |
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97 | |||
98 | |||
99 | /* format 6 */ |
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100 | |||
101 | struct TCMap6_ |
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102 | { |
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103 | UShort firstCode; /* first character code of subrange */ |
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104 | UShort entryCount; /* number of character codes in subrange */ |
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105 | |||
106 | PUShort glyphIdArray; |
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107 | }; |
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108 | |||
109 | typedef struct TCMap6_ TCMap6; |
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110 | typedef TCMap6* PCMap6; |
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111 | |||
112 | |||
113 | /* charmap table */ |
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114 | |||
115 | struct TCMapTable_ |
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116 | { |
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117 | UShort platformID; |
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118 | UShort platformEncodingID; |
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119 | UShort format; |
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120 | UShort length; |
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121 | UShort version; |
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122 | |||
123 | Bool loaded; |
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124 | ULong offset; |
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125 | |||
126 | union |
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127 | { |
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128 | TCMap0 cmap0; |
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129 | TCMap2 cmap2; |
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130 | TCMap4 cmap4; |
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131 | TCMap6 cmap6; |
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132 | } c; |
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133 | }; |
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134 | |||
135 | typedef struct TCMapTable_ TCMapTable; |
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136 | typedef TCMapTable* PCMapTable; |
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137 | |||
138 | |||
139 | |||
140 | /* Load character mappings directory when face is loaded. */ |
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141 | /* The mappings themselves are only loaded on demand. */ |
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142 | |||
143 | LOCAL_DEF |
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144 | TT_Error CharMap_Load( PCMapTable table, |
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145 | TT_Stream input ); |
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146 | |||
147 | |||
148 | /* Destroy one character mapping table */ |
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149 | |||
150 | LOCAL_DEF |
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151 | TT_Error CharMap_Free( PCMapTable table ); |
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152 | |||
153 | |||
154 | /* Use character mapping table to perform mapping */ |
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155 | |||
156 | LOCAL_DEF |
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157 | UShort CharMap_Index( PCMapTable cmap, |
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158 | UShort charCode ); |
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159 | |||
160 | /* NOTE: The PFace type isn't defined at this point */ |
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161 | |||
162 | #ifdef __cplusplus |
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163 | } |
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164 | #endif |
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165 | |||
166 | #endif /* TTCMAP_H */ |
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167 | |||
168 | |||
169 | /* END */ |