1 /***************************************************************************/ |
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2 /* */ |
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3 /* ttgxvar.c */ |
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4 /* */ |
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5 /* TrueType GX Font Variation loader */ |
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6 /* */ |
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7 /* Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010 by */ |
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8 /* David Turner, Robert Wilhelm, Werner Lemberg, and George Williams. */ |
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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 /*************************************************************************/ |
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20 /* */ |
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21 /* Apple documents the `fvar', `gvar', `cvar', and `avar' tables at */ |
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22 /* */ |
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23 /* http://developer.apple.com/fonts/TTRefMan/RM06/Chap6[fgca]var.html */ |
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24 /* */ |
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25 /* The documentation for `fvar' is inconsistent. At one point it says */ |
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26 /* that `countSizePairs' should be 3, at another point 2. It should */ |
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27 /* be 2. */ |
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28 /* */ |
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29 /* The documentation for `gvar' is not intelligible; `cvar' refers you */ |
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30 /* to `gvar' and is thus also incomprehensible. */ |
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31 /* */ |
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32 /* The documentation for `avar' appears correct, but Apple has no fonts */ |
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33 /* with an `avar' table, so it is hard to test. */ |
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34 /* */ |
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35 /* Many thanks to John Jenkins (at Apple) in figuring this out. */ |
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36 /* */ |
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37 /* */ |
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38 /* Apple's `kern' table has some references to tuple indices, but as */ |
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39 /* there is no indication where these indices are defined, nor how to */ |
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40 /* interpolate the kerning values (different tuples have different */ |
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41 /* classes) this issue is ignored. */ |
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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 #include <ft2build.h> |
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47 #include FT_INTERNAL_DEBUG_H |
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48 #include FT_CONFIG_CONFIG_H |
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49 #include FT_INTERNAL_STREAM_H |
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50 #include FT_INTERNAL_SFNT_H |
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51 #include FT_TRUETYPE_TAGS_H |
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52 #include FT_MULTIPLE_MASTERS_H |
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53 |
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54 #include "ttpload.h" |
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55 #include "ttgxvar.h" |
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56 |
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57 #include "tterrors.h" |
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58 |
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59 |
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60 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
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61 |
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62 |
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63 #define FT_Stream_FTell( stream ) \ |
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64 ( (stream)->cursor - (stream)->base ) |
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65 #define FT_Stream_SeekSet( stream, off ) \ |
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66 ( (stream)->cursor = (stream)->base+(off) ) |
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67 |
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68 |
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69 /*************************************************************************/ |
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70 /* */ |
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71 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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72 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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73 /* messages during execution. */ |
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74 /* */ |
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75 #undef FT_COMPONENT |
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76 #define FT_COMPONENT trace_ttgxvar |
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77 |
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78 |
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79 /*************************************************************************/ |
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80 /*************************************************************************/ |
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81 /***** *****/ |
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82 /***** Internal Routines *****/ |
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83 /***** *****/ |
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84 /*************************************************************************/ |
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85 /*************************************************************************/ |
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86 |
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87 |
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88 /*************************************************************************/ |
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89 /* */ |
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90 /* The macro ALL_POINTS is used in `ft_var_readpackedpoints'. It */ |
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91 /* indicates that there is a delta for every point without needing to */ |
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92 /* enumerate all of them. */ |
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93 /* */ |
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94 #define ALL_POINTS (FT_UShort*)( -1 ) |
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95 |
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96 |
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97 #define GX_PT_POINTS_ARE_WORDS 0x80 |
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98 #define GX_PT_POINT_RUN_COUNT_MASK 0x7F |
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99 |
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100 |
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101 /*************************************************************************/ |
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102 /* */ |
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103 /* <Function> */ |
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104 /* ft_var_readpackedpoints */ |
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105 /* */ |
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106 /* <Description> */ |
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107 /* Read a set of points to which the following deltas will apply. */ |
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108 /* Points are packed with a run length encoding. */ |
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109 /* */ |
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110 /* <Input> */ |
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111 /* stream :: The data stream. */ |
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112 /* */ |
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113 /* <Output> */ |
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114 /* point_cnt :: The number of points read. A zero value means that */ |
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115 /* all points in the glyph will be affected, without */ |
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116 /* enumerating them individually. */ |
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117 /* */ |
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118 /* <Return> */ |
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119 /* An array of FT_UShort containing the affected points or the */ |
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120 /* special value ALL_POINTS. */ |
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121 /* */ |
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122 static FT_UShort* |
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123 ft_var_readpackedpoints( FT_Stream stream, |
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124 FT_UInt *point_cnt ) |
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125 { |
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126 FT_UShort *points; |
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127 FT_Int n; |
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128 FT_Int runcnt; |
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129 FT_Int i; |
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130 FT_Int j; |
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131 FT_Int first; |
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132 FT_Memory memory = stream->memory; |
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133 FT_Error error = TT_Err_Ok; |
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134 |
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135 FT_UNUSED( error ); |
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136 |
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137 |
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138 *point_cnt = n = FT_GET_BYTE(); |
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139 if ( n == 0 ) |
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140 return ALL_POINTS; |
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141 |
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142 if ( n & GX_PT_POINTS_ARE_WORDS ) |
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143 n = FT_GET_BYTE() | ( ( n & GX_PT_POINT_RUN_COUNT_MASK ) << 8 ); |
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144 |
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145 if ( FT_NEW_ARRAY( points, n ) ) |
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146 return NULL; |
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147 |
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148 i = 0; |
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149 while ( i < n ) |
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150 { |
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151 runcnt = FT_GET_BYTE(); |
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152 if ( runcnt & GX_PT_POINTS_ARE_WORDS ) |
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153 { |
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154 runcnt = runcnt & GX_PT_POINT_RUN_COUNT_MASK; |
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155 first = points[i++] = FT_GET_USHORT(); |
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156 |
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157 if ( runcnt < 1 || i + runcnt >= n ) |
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158 goto Exit; |
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159 |
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160 /* first point not included in runcount */ |
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161 for ( j = 0; j < runcnt; ++j ) |
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162 points[i++] = (FT_UShort)( first += FT_GET_USHORT() ); |
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163 } |
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164 else |
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165 { |
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166 first = points[i++] = FT_GET_BYTE(); |
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167 |
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168 if ( runcnt < 1 || i + runcnt >= n ) |
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169 goto Exit; |
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170 |
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171 for ( j = 0; j < runcnt; ++j ) |
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172 points[i++] = (FT_UShort)( first += FT_GET_BYTE() ); |
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173 } |
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174 } |
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175 |
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176 Exit: |
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177 return points; |
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178 } |
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179 |
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180 |
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181 enum |
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182 { |
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183 GX_DT_DELTAS_ARE_ZERO = 0x80, |
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184 GX_DT_DELTAS_ARE_WORDS = 0x40, |
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185 GX_DT_DELTA_RUN_COUNT_MASK = 0x3F |
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186 }; |
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187 |
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188 |
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189 /*************************************************************************/ |
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190 /* */ |
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191 /* <Function> */ |
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192 /* ft_var_readpackeddeltas */ |
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193 /* */ |
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194 /* <Description> */ |
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195 /* Read a set of deltas. These are packed slightly differently than */ |
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196 /* points. In particular there is no overall count. */ |
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197 /* */ |
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198 /* <Input> */ |
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199 /* stream :: The data stream. */ |
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200 /* */ |
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201 /* delta_cnt :: The number of to be read. */ |
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202 /* */ |
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203 /* <Return> */ |
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204 /* An array of FT_Short containing the deltas for the affected */ |
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205 /* points. (This only gets the deltas for one dimension. It will */ |
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206 /* generally be called twice, once for x, once for y. When used in */ |
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207 /* cvt table, it will only be called once.) */ |
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208 /* */ |
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209 static FT_Short* |
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210 ft_var_readpackeddeltas( FT_Stream stream, |
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211 FT_Offset delta_cnt ) |
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212 { |
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213 FT_Short *deltas = NULL; |
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214 FT_UInt runcnt; |
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215 FT_Offset i; |
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216 FT_UInt j; |
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217 FT_Memory memory = stream->memory; |
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218 FT_Error error = TT_Err_Ok; |
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219 |
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220 FT_UNUSED( error ); |
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221 |
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222 |
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223 if ( FT_NEW_ARRAY( deltas, delta_cnt ) ) |
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224 return NULL; |
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225 |
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226 i = 0; |
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227 while ( i < delta_cnt ) |
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228 { |
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229 runcnt = FT_GET_BYTE(); |
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230 if ( runcnt & GX_DT_DELTAS_ARE_ZERO ) |
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231 { |
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232 /* runcnt zeroes get added */ |
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233 for ( j = 0; |
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234 j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt; |
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235 ++j ) |
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236 deltas[i++] = 0; |
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237 } |
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238 else if ( runcnt & GX_DT_DELTAS_ARE_WORDS ) |
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239 { |
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240 /* runcnt shorts from the stack */ |
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241 for ( j = 0; |
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242 j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt; |
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243 ++j ) |
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244 deltas[i++] = FT_GET_SHORT(); |
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245 } |
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246 else |
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247 { |
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248 /* runcnt signed bytes from the stack */ |
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249 for ( j = 0; |
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250 j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt; |
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251 ++j ) |
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252 deltas[i++] = FT_GET_CHAR(); |
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253 } |
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254 |
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255 if ( j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) ) |
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256 { |
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257 /* Bad format */ |
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258 FT_FREE( deltas ); |
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259 return NULL; |
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260 } |
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261 } |
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262 |
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263 return deltas; |
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264 } |
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265 |
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266 |
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267 /*************************************************************************/ |
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268 /* */ |
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269 /* <Function> */ |
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270 /* ft_var_load_avar */ |
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271 /* */ |
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272 /* <Description> */ |
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273 /* Parse the `avar' table if present. It need not be, so we return */ |
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274 /* nothing. */ |
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275 /* */ |
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276 /* <InOut> */ |
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277 /* face :: The font face. */ |
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278 /* */ |
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279 static void |
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280 ft_var_load_avar( TT_Face face ) |
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281 { |
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282 FT_Stream stream = FT_FACE_STREAM(face); |
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283 FT_Memory memory = stream->memory; |
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284 GX_Blend blend = face->blend; |
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285 GX_AVarSegment segment; |
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286 FT_Error error = TT_Err_Ok; |
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287 FT_ULong version; |
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288 FT_Long axisCount; |
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289 FT_Int i, j; |
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290 FT_ULong table_len; |
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291 |
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292 FT_UNUSED( error ); |
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293 |
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294 |
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295 blend->avar_checked = TRUE; |
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296 if ( (error = face->goto_table( face, TTAG_avar, stream, &table_len )) != 0 ) |
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297 return; |
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298 |
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299 if ( FT_FRAME_ENTER( table_len ) ) |
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300 return; |
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301 |
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302 version = FT_GET_LONG(); |
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303 axisCount = FT_GET_LONG(); |
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304 |
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305 if ( version != 0x00010000L || |
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306 axisCount != (FT_Long)blend->mmvar->num_axis ) |
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307 goto Exit; |
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308 |
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309 if ( FT_NEW_ARRAY( blend->avar_segment, axisCount ) ) |
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310 goto Exit; |
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311 |
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312 segment = &blend->avar_segment[0]; |
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313 for ( i = 0; i < axisCount; ++i, ++segment ) |
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314 { |
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315 segment->pairCount = FT_GET_USHORT(); |
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316 if ( FT_NEW_ARRAY( segment->correspondence, segment->pairCount ) ) |
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317 { |
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318 /* Failure. Free everything we have done so far. We must do */ |
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319 /* it right now since loading the `avar' table is optional. */ |
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320 |
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321 for ( j = i - 1; j >= 0; --j ) |
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322 FT_FREE( blend->avar_segment[j].correspondence ); |
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323 |
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324 FT_FREE( blend->avar_segment ); |
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325 blend->avar_segment = NULL; |
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326 goto Exit; |
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327 } |
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328 |
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329 for ( j = 0; j < segment->pairCount; ++j ) |
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330 { |
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331 segment->correspondence[j].fromCoord = |
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332 FT_GET_SHORT() << 2; /* convert to Fixed */ |
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333 segment->correspondence[j].toCoord = |
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334 FT_GET_SHORT()<<2; /* convert to Fixed */ |
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335 } |
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336 } |
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337 |
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338 Exit: |
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339 FT_FRAME_EXIT(); |
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340 } |
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341 |
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342 |
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343 typedef struct GX_GVar_Head_ |
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344 { |
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345 FT_Long version; |
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346 FT_UShort axisCount; |
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347 FT_UShort globalCoordCount; |
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348 FT_ULong offsetToCoord; |
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349 FT_UShort glyphCount; |
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350 FT_UShort flags; |
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351 FT_ULong offsetToData; |
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352 |
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353 } GX_GVar_Head; |
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354 |
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355 |
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356 /*************************************************************************/ |
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357 /* */ |
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358 /* <Function> */ |
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359 /* ft_var_load_gvar */ |
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360 /* */ |
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361 /* <Description> */ |
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362 /* Parses the `gvar' table if present. If `fvar' is there, `gvar' */ |
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363 /* had better be there too. */ |
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364 /* */ |
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365 /* <InOut> */ |
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366 /* face :: The font face. */ |
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367 /* */ |
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368 /* <Return> */ |
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369 /* FreeType error code. 0 means success. */ |
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370 /* */ |
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371 static FT_Error |
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372 ft_var_load_gvar( TT_Face face ) |
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373 { |
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374 FT_Stream stream = FT_FACE_STREAM(face); |
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375 FT_Memory memory = stream->memory; |
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376 GX_Blend blend = face->blend; |
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377 FT_Error error; |
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378 FT_UInt i, j; |
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379 FT_ULong table_len; |
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380 FT_ULong gvar_start; |
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381 FT_ULong offsetToData; |
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382 GX_GVar_Head gvar_head; |
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383 |
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384 static const FT_Frame_Field gvar_fields[] = |
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385 { |
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386 |
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387 #undef FT_STRUCTURE |
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388 #define FT_STRUCTURE GX_GVar_Head |
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389 |
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390 FT_FRAME_START( 20 ), |
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391 FT_FRAME_LONG ( version ), |
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392 FT_FRAME_USHORT( axisCount ), |
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393 FT_FRAME_USHORT( globalCoordCount ), |
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394 FT_FRAME_ULONG ( offsetToCoord ), |
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395 FT_FRAME_USHORT( glyphCount ), |
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396 FT_FRAME_USHORT( flags ), |
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397 FT_FRAME_ULONG ( offsetToData ), |
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398 FT_FRAME_END |
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399 }; |
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400 |
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401 if ( (error = face->goto_table( face, TTAG_gvar, stream, &table_len )) != 0 ) |
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402 goto Exit; |
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403 |
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404 gvar_start = FT_STREAM_POS( ); |
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405 if ( FT_STREAM_READ_FIELDS( gvar_fields, &gvar_head ) ) |
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406 goto Exit; |
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407 |
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408 blend->tuplecount = gvar_head.globalCoordCount; |
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409 blend->gv_glyphcnt = gvar_head.glyphCount; |
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410 offsetToData = gvar_start + gvar_head.offsetToData; |
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411 |
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412 if ( gvar_head.version != (FT_Long)0x00010000L || |
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413 gvar_head.axisCount != (FT_UShort)blend->mmvar->num_axis ) |
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414 { |
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415 error = TT_Err_Invalid_Table; |
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416 goto Exit; |
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417 } |
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418 |
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419 if ( FT_NEW_ARRAY( blend->glyphoffsets, blend->gv_glyphcnt + 1 ) ) |
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420 goto Exit; |
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421 |
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422 if ( gvar_head.flags & 1 ) |
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423 { |
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424 /* long offsets (one more offset than glyphs, to mark size of last) */ |
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425 if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 4L ) ) |
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426 goto Exit; |
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427 |
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428 for ( i = 0; i <= blend->gv_glyphcnt; ++i ) |
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429 blend->glyphoffsets[i] = offsetToData + FT_GET_LONG(); |
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430 |
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431 FT_FRAME_EXIT(); |
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432 } |
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433 else |
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434 { |
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435 /* short offsets (one more offset than glyphs, to mark size of last) */ |
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436 if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 2L ) ) |
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437 goto Exit; |
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438 |
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439 for ( i = 0; i <= blend->gv_glyphcnt; ++i ) |
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440 blend->glyphoffsets[i] = offsetToData + FT_GET_USHORT() * 2; |
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441 /* XXX: Undocumented: `*2'! */ |
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442 |
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443 FT_FRAME_EXIT(); |
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444 } |
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445 |
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446 if ( blend->tuplecount != 0 ) |
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447 { |
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448 if ( FT_NEW_ARRAY( blend->tuplecoords, |
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449 gvar_head.axisCount * blend->tuplecount ) ) |
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450 goto Exit; |
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451 |
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452 if ( FT_STREAM_SEEK( gvar_start + gvar_head.offsetToCoord ) || |
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453 FT_FRAME_ENTER( blend->tuplecount * gvar_head.axisCount * 2L ) ) |
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454 goto Exit; |
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455 |
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456 for ( i = 0; i < blend->tuplecount; ++i ) |
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457 for ( j = 0 ; j < (FT_UInt)gvar_head.axisCount; ++j ) |
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458 blend->tuplecoords[i * gvar_head.axisCount + j] = |
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459 FT_GET_SHORT() << 2; /* convert to FT_Fixed */ |
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460 |
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461 FT_FRAME_EXIT(); |
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462 } |
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463 |
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464 Exit: |
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465 return error; |
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466 } |
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467 |
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468 |
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469 /*************************************************************************/ |
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470 /* */ |
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471 /* <Function> */ |
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472 /* ft_var_apply_tuple */ |
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473 /* */ |
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474 /* <Description> */ |
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475 /* Figure out whether a given tuple (design) applies to the current */ |
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476 /* blend, and if so, what is the scaling factor. */ |
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477 /* */ |
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478 /* <Input> */ |
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479 /* blend :: The current blend of the font. */ |
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480 /* */ |
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481 /* tupleIndex :: A flag saying whether this is an intermediate */ |
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482 /* tuple or not. */ |
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483 /* */ |
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484 /* tuple_coords :: The coordinates of the tuple in normalized axis */ |
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485 /* units. */ |
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486 /* */ |
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487 /* im_start_coords :: The initial coordinates where this tuple starts */ |
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488 /* to apply (for intermediate coordinates). */ |
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489 /* */ |
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490 /* im_end_coords :: The final coordinates after which this tuple no */ |
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491 /* longer applies (for intermediate coordinates). */ |
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492 /* */ |
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493 /* <Return> */ |
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494 /* An FT_Fixed value containing the scaling factor. */ |
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495 /* */ |
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496 static FT_Fixed |
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497 ft_var_apply_tuple( GX_Blend blend, |
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498 FT_UShort tupleIndex, |
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499 FT_Fixed* tuple_coords, |
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500 FT_Fixed* im_start_coords, |
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501 FT_Fixed* im_end_coords ) |
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502 { |
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503 FT_UInt i; |
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504 FT_Fixed apply; |
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505 FT_Fixed temp; |
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506 |
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507 |
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508 apply = 0x10000L; |
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509 for ( i = 0; i < blend->num_axis; ++i ) |
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510 { |
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511 if ( tuple_coords[i] == 0 ) |
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512 /* It's not clear why (for intermediate tuples) we don't need */ |
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513 /* to check against start/end -- the documentation says we don't. */ |
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514 /* Similarly, it's unclear why we don't need to scale along the */ |
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515 /* axis. */ |
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516 continue; |
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517 |
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518 else if ( blend->normalizedcoords[i] == 0 || |
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519 ( blend->normalizedcoords[i] < 0 && tuple_coords[i] > 0 ) || |
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520 ( blend->normalizedcoords[i] > 0 && tuple_coords[i] < 0 ) ) |
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521 { |
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522 apply = 0; |
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523 break; |
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524 } |
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525 |
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526 else if ( !( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) ) |
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527 /* not an intermediate tuple */ |
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528 apply = FT_MulDiv( apply, |
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529 blend->normalizedcoords[i] > 0 |
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530 ? blend->normalizedcoords[i] |
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531 : -blend->normalizedcoords[i], |
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532 0x10000L ); |
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533 |
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534 else if ( blend->normalizedcoords[i] <= im_start_coords[i] || |
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535 blend->normalizedcoords[i] >= im_end_coords[i] ) |
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536 { |
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537 apply = 0; |
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538 break; |
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539 } |
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540 |
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541 else if ( blend->normalizedcoords[i] < tuple_coords[i] ) |
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542 { |
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543 temp = FT_MulDiv( blend->normalizedcoords[i] - im_start_coords[i], |
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544 0x10000L, |
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545 tuple_coords[i] - im_start_coords[i]); |
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546 apply = FT_MulDiv( apply, temp, 0x10000L ); |
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547 } |
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548 |
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549 else |
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550 { |
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551 temp = FT_MulDiv( im_end_coords[i] - blend->normalizedcoords[i], |
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552 0x10000L, |
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553 im_end_coords[i] - tuple_coords[i] ); |
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554 apply = FT_MulDiv( apply, temp, 0x10000L ); |
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555 } |
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556 } |
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557 |
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558 return apply; |
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559 } |
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560 |
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561 |
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562 /*************************************************************************/ |
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563 /*************************************************************************/ |
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564 /***** *****/ |
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565 /***** MULTIPLE MASTERS SERVICE FUNCTIONS *****/ |
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566 /***** *****/ |
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567 /*************************************************************************/ |
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568 /*************************************************************************/ |
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569 |
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570 |
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571 typedef struct GX_FVar_Head_ |
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572 { |
|
573 FT_Long version; |
|
574 FT_UShort offsetToData; |
|
575 FT_UShort countSizePairs; |
|
576 FT_UShort axisCount; |
|
577 FT_UShort axisSize; |
|
578 FT_UShort instanceCount; |
|
579 FT_UShort instanceSize; |
|
580 |
|
581 } GX_FVar_Head; |
|
582 |
|
583 |
|
584 typedef struct fvar_axis_ |
|
585 { |
|
586 FT_ULong axisTag; |
|
587 FT_ULong minValue; |
|
588 FT_ULong defaultValue; |
|
589 FT_ULong maxValue; |
|
590 FT_UShort flags; |
|
591 FT_UShort nameID; |
|
592 |
|
593 } GX_FVar_Axis; |
|
594 |
|
595 |
|
596 /*************************************************************************/ |
|
597 /* */ |
|
598 /* <Function> */ |
|
599 /* TT_Get_MM_Var */ |
|
600 /* */ |
|
601 /* <Description> */ |
|
602 /* Check that the font's `fvar' table is valid, parse it, and return */ |
|
603 /* those data. */ |
|
604 /* */ |
|
605 /* <InOut> */ |
|
606 /* face :: The font face. */ |
|
607 /* TT_Get_MM_Var initializes the blend structure. */ |
|
608 /* */ |
|
609 /* <Output> */ |
|
610 /* master :: The `fvar' data (must be freed by caller). */ |
|
611 /* */ |
|
612 /* <Return> */ |
|
613 /* FreeType error code. 0 means success. */ |
|
614 /* */ |
|
615 FT_LOCAL_DEF( FT_Error ) |
|
616 TT_Get_MM_Var( TT_Face face, |
|
617 FT_MM_Var* *master ) |
|
618 { |
|
619 FT_Stream stream = face->root.stream; |
|
620 FT_Memory memory = face->root.memory; |
|
621 FT_ULong table_len; |
|
622 FT_Error error = TT_Err_Ok; |
|
623 FT_ULong fvar_start; |
|
624 FT_Int i, j; |
|
625 FT_MM_Var* mmvar; |
|
626 FT_Fixed* next_coords; |
|
627 FT_String* next_name; |
|
628 FT_Var_Axis* a; |
|
629 FT_Var_Named_Style* ns; |
|
630 GX_FVar_Head fvar_head; |
|
631 |
|
632 static const FT_Frame_Field fvar_fields[] = |
|
633 { |
|
634 |
|
635 #undef FT_STRUCTURE |
|
636 #define FT_STRUCTURE GX_FVar_Head |
|
637 |
|
638 FT_FRAME_START( 16 ), |
|
639 FT_FRAME_LONG ( version ), |
|
640 FT_FRAME_USHORT( offsetToData ), |
|
641 FT_FRAME_USHORT( countSizePairs ), |
|
642 FT_FRAME_USHORT( axisCount ), |
|
643 FT_FRAME_USHORT( axisSize ), |
|
644 FT_FRAME_USHORT( instanceCount ), |
|
645 FT_FRAME_USHORT( instanceSize ), |
|
646 FT_FRAME_END |
|
647 }; |
|
648 |
|
649 static const FT_Frame_Field fvaraxis_fields[] = |
|
650 { |
|
651 |
|
652 #undef FT_STRUCTURE |
|
653 #define FT_STRUCTURE GX_FVar_Axis |
|
654 |
|
655 FT_FRAME_START( 20 ), |
|
656 FT_FRAME_ULONG ( axisTag ), |
|
657 FT_FRAME_ULONG ( minValue ), |
|
658 FT_FRAME_ULONG ( defaultValue ), |
|
659 FT_FRAME_ULONG ( maxValue ), |
|
660 FT_FRAME_USHORT( flags ), |
|
661 FT_FRAME_USHORT( nameID ), |
|
662 FT_FRAME_END |
|
663 }; |
|
664 |
|
665 |
|
666 if ( face->blend == NULL ) |
|
667 { |
|
668 /* both `fvar' and `gvar' must be present */ |
|
669 if ( (error = face->goto_table( face, TTAG_gvar, |
|
670 stream, &table_len )) != 0 ) |
|
671 goto Exit; |
|
672 |
|
673 if ( (error = face->goto_table( face, TTAG_fvar, |
|
674 stream, &table_len )) != 0 ) |
|
675 goto Exit; |
|
676 |
|
677 fvar_start = FT_STREAM_POS( ); |
|
678 |
|
679 if ( FT_STREAM_READ_FIELDS( fvar_fields, &fvar_head ) ) |
|
680 goto Exit; |
|
681 |
|
682 if ( fvar_head.version != (FT_Long)0x00010000L || |
|
683 fvar_head.countSizePairs != 2 || |
|
684 fvar_head.axisSize != 20 || |
|
685 /* axisCount limit implied by 16-bit instanceSize */ |
|
686 fvar_head.axisCount > 0x3FFE || |
|
687 fvar_head.instanceSize != 4 + 4 * fvar_head.axisCount || |
|
688 /* instanceCount limit implied by limited range of name IDs */ |
|
689 fvar_head.instanceCount > 0x7EFF || |
|
690 fvar_head.offsetToData + fvar_head.axisCount * 20U + |
|
691 fvar_head.instanceCount * fvar_head.instanceSize > table_len ) |
|
692 { |
|
693 error = TT_Err_Invalid_Table; |
|
694 goto Exit; |
|
695 } |
|
696 |
|
697 if ( FT_NEW( face->blend ) ) |
|
698 goto Exit; |
|
699 |
|
700 /* cannot overflow 32-bit arithmetic because of limits above */ |
|
701 face->blend->mmvar_len = |
|
702 sizeof ( FT_MM_Var ) + |
|
703 fvar_head.axisCount * sizeof ( FT_Var_Axis ) + |
|
704 fvar_head.instanceCount * sizeof ( FT_Var_Named_Style ) + |
|
705 fvar_head.instanceCount * fvar_head.axisCount * sizeof ( FT_Fixed ) + |
|
706 5 * fvar_head.axisCount; |
|
707 |
|
708 if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) ) |
|
709 goto Exit; |
|
710 face->blend->mmvar = mmvar; |
|
711 |
|
712 mmvar->num_axis = |
|
713 fvar_head.axisCount; |
|
714 mmvar->num_designs = |
|
715 (FT_UInt)-1; /* meaningless in this context; each glyph */ |
|
716 /* may have a different number of designs */ |
|
717 /* (or tuples, as called by Apple) */ |
|
718 mmvar->num_namedstyles = |
|
719 fvar_head.instanceCount; |
|
720 mmvar->axis = |
|
721 (FT_Var_Axis*)&(mmvar[1]); |
|
722 mmvar->namedstyle = |
|
723 (FT_Var_Named_Style*)&(mmvar->axis[fvar_head.axisCount]); |
|
724 |
|
725 next_coords = |
|
726 (FT_Fixed*)&(mmvar->namedstyle[fvar_head.instanceCount]); |
|
727 for ( i = 0; i < fvar_head.instanceCount; ++i ) |
|
728 { |
|
729 mmvar->namedstyle[i].coords = next_coords; |
|
730 next_coords += fvar_head.axisCount; |
|
731 } |
|
732 |
|
733 next_name = (FT_String*)next_coords; |
|
734 for ( i = 0; i < fvar_head.axisCount; ++i ) |
|
735 { |
|
736 mmvar->axis[i].name = next_name; |
|
737 next_name += 5; |
|
738 } |
|
739 |
|
740 if ( FT_STREAM_SEEK( fvar_start + fvar_head.offsetToData ) ) |
|
741 goto Exit; |
|
742 |
|
743 a = mmvar->axis; |
|
744 for ( i = 0; i < fvar_head.axisCount; ++i ) |
|
745 { |
|
746 GX_FVar_Axis axis_rec; |
|
747 |
|
748 |
|
749 if ( FT_STREAM_READ_FIELDS( fvaraxis_fields, &axis_rec ) ) |
|
750 goto Exit; |
|
751 a->tag = axis_rec.axisTag; |
|
752 a->minimum = axis_rec.minValue; /* A Fixed */ |
|
753 a->def = axis_rec.defaultValue; /* A Fixed */ |
|
754 a->maximum = axis_rec.maxValue; /* A Fixed */ |
|
755 a->strid = axis_rec.nameID; |
|
756 |
|
757 a->name[0] = (FT_String)( a->tag >> 24 ); |
|
758 a->name[1] = (FT_String)( ( a->tag >> 16 ) & 0xFF ); |
|
759 a->name[2] = (FT_String)( ( a->tag >> 8 ) & 0xFF ); |
|
760 a->name[3] = (FT_String)( ( a->tag ) & 0xFF ); |
|
761 a->name[4] = 0; |
|
762 |
|
763 ++a; |
|
764 } |
|
765 |
|
766 ns = mmvar->namedstyle; |
|
767 for ( i = 0; i < fvar_head.instanceCount; ++i, ++ns ) |
|
768 { |
|
769 if ( FT_FRAME_ENTER( 4L + 4L * fvar_head.axisCount ) ) |
|
770 goto Exit; |
|
771 |
|
772 ns->strid = FT_GET_USHORT(); |
|
773 (void) /* flags = */ FT_GET_USHORT(); |
|
774 |
|
775 for ( j = 0; j < fvar_head.axisCount; ++j ) |
|
776 ns->coords[j] = FT_GET_ULONG(); /* A Fixed */ |
|
777 |
|
778 FT_FRAME_EXIT(); |
|
779 } |
|
780 } |
|
781 |
|
782 if ( master != NULL ) |
|
783 { |
|
784 FT_UInt n; |
|
785 |
|
786 |
|
787 if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) ) |
|
788 goto Exit; |
|
789 FT_MEM_COPY( mmvar, face->blend->mmvar, face->blend->mmvar_len ); |
|
790 |
|
791 mmvar->axis = |
|
792 (FT_Var_Axis*)&(mmvar[1]); |
|
793 mmvar->namedstyle = |
|
794 (FT_Var_Named_Style*)&(mmvar->axis[mmvar->num_axis]); |
|
795 next_coords = |
|
796 (FT_Fixed*)&(mmvar->namedstyle[mmvar->num_namedstyles]); |
|
797 |
|
798 for ( n = 0; n < mmvar->num_namedstyles; ++n ) |
|
799 { |
|
800 mmvar->namedstyle[n].coords = next_coords; |
|
801 next_coords += mmvar->num_axis; |
|
802 } |
|
803 |
|
804 a = mmvar->axis; |
|
805 next_name = (FT_String*)next_coords; |
|
806 for ( n = 0; n < mmvar->num_axis; ++n ) |
|
807 { |
|
808 a->name = next_name; |
|
809 |
|
810 /* standard PostScript names for some standard apple tags */ |
|
811 if ( a->tag == TTAG_wght ) |
|
812 a->name = (char *)"Weight"; |
|
813 else if ( a->tag == TTAG_wdth ) |
|
814 a->name = (char *)"Width"; |
|
815 else if ( a->tag == TTAG_opsz ) |
|
816 a->name = (char *)"OpticalSize"; |
|
817 else if ( a->tag == TTAG_slnt ) |
|
818 a->name = (char *)"Slant"; |
|
819 |
|
820 next_name += 5; |
|
821 ++a; |
|
822 } |
|
823 |
|
824 *master = mmvar; |
|
825 } |
|
826 |
|
827 Exit: |
|
828 return error; |
|
829 } |
|
830 |
|
831 |
|
832 /*************************************************************************/ |
|
833 /* */ |
|
834 /* <Function> */ |
|
835 /* TT_Set_MM_Blend */ |
|
836 /* */ |
|
837 /* <Description> */ |
|
838 /* Set the blend (normalized) coordinates for this instance of the */ |
|
839 /* font. Check that the `gvar' table is reasonable and does some */ |
|
840 /* initial preparation. */ |
|
841 /* */ |
|
842 /* <InOut> */ |
|
843 /* face :: The font. */ |
|
844 /* Initialize the blend structure with `gvar' data. */ |
|
845 /* */ |
|
846 /* <Input> */ |
|
847 /* num_coords :: Must be the axis count of the font. */ |
|
848 /* */ |
|
849 /* coords :: An array of num_coords, each between [-1,1]. */ |
|
850 /* */ |
|
851 /* <Return> */ |
|
852 /* FreeType error code. 0 means success. */ |
|
853 /* */ |
|
854 FT_LOCAL_DEF( FT_Error ) |
|
855 TT_Set_MM_Blend( TT_Face face, |
|
856 FT_UInt num_coords, |
|
857 FT_Fixed* coords ) |
|
858 { |
|
859 FT_Error error = TT_Err_Ok; |
|
860 GX_Blend blend; |
|
861 FT_MM_Var* mmvar; |
|
862 FT_UInt i; |
|
863 FT_Memory memory = face->root.memory; |
|
864 |
|
865 enum |
|
866 { |
|
867 mcvt_retain, |
|
868 mcvt_modify, |
|
869 mcvt_load |
|
870 |
|
871 } manageCvt; |
|
872 |
|
873 |
|
874 face->doblend = FALSE; |
|
875 |
|
876 if ( face->blend == NULL ) |
|
877 { |
|
878 if ( (error = TT_Get_MM_Var( face, NULL)) != 0 ) |
|
879 goto Exit; |
|
880 } |
|
881 |
|
882 blend = face->blend; |
|
883 mmvar = blend->mmvar; |
|
884 |
|
885 if ( num_coords != mmvar->num_axis ) |
|
886 { |
|
887 error = TT_Err_Invalid_Argument; |
|
888 goto Exit; |
|
889 } |
|
890 |
|
891 for ( i = 0; i < num_coords; ++i ) |
|
892 if ( coords[i] < -0x00010000L || coords[i] > 0x00010000L ) |
|
893 { |
|
894 error = TT_Err_Invalid_Argument; |
|
895 goto Exit; |
|
896 } |
|
897 |
|
898 if ( blend->glyphoffsets == NULL ) |
|
899 if ( (error = ft_var_load_gvar( face )) != 0 ) |
|
900 goto Exit; |
|
901 |
|
902 if ( blend->normalizedcoords == NULL ) |
|
903 { |
|
904 if ( FT_NEW_ARRAY( blend->normalizedcoords, num_coords ) ) |
|
905 goto Exit; |
|
906 |
|
907 manageCvt = mcvt_modify; |
|
908 |
|
909 /* If we have not set the blend coordinates before this, then the */ |
|
910 /* cvt table will still be what we read from the `cvt ' table and */ |
|
911 /* we don't need to reload it. We may need to change it though... */ |
|
912 } |
|
913 else |
|
914 { |
|
915 manageCvt = mcvt_retain; |
|
916 for ( i = 0; i < num_coords; ++i ) |
|
917 { |
|
918 if ( blend->normalizedcoords[i] != coords[i] ) |
|
919 { |
|
920 manageCvt = mcvt_load; |
|
921 break; |
|
922 } |
|
923 } |
|
924 |
|
925 /* If we don't change the blend coords then we don't need to do */ |
|
926 /* anything to the cvt table. It will be correct. Otherwise we */ |
|
927 /* no longer have the original cvt (it was modified when we set */ |
|
928 /* the blend last time), so we must reload and then modify it. */ |
|
929 } |
|
930 |
|
931 blend->num_axis = num_coords; |
|
932 FT_MEM_COPY( blend->normalizedcoords, |
|
933 coords, |
|
934 num_coords * sizeof ( FT_Fixed ) ); |
|
935 |
|
936 face->doblend = TRUE; |
|
937 |
|
938 if ( face->cvt != NULL ) |
|
939 { |
|
940 switch ( manageCvt ) |
|
941 { |
|
942 case mcvt_load: |
|
943 /* The cvt table has been loaded already; every time we change the */ |
|
944 /* blend we may need to reload and remodify the cvt table. */ |
|
945 FT_FREE( face->cvt ); |
|
946 face->cvt = NULL; |
|
947 |
|
948 tt_face_load_cvt( face, face->root.stream ); |
|
949 break; |
|
950 |
|
951 case mcvt_modify: |
|
952 /* The original cvt table is in memory. All we need to do is */ |
|
953 /* apply the `cvar' table (if any). */ |
|
954 tt_face_vary_cvt( face, face->root.stream ); |
|
955 break; |
|
956 |
|
957 case mcvt_retain: |
|
958 /* The cvt table is correct for this set of coordinates. */ |
|
959 break; |
|
960 } |
|
961 } |
|
962 |
|
963 Exit: |
|
964 return error; |
|
965 } |
|
966 |
|
967 |
|
968 /*************************************************************************/ |
|
969 /* */ |
|
970 /* <Function> */ |
|
971 /* TT_Set_Var_Design */ |
|
972 /* */ |
|
973 /* <Description> */ |
|
974 /* Set the coordinates for the instance, measured in the user */ |
|
975 /* coordinate system. Parse the `avar' table (if present) to convert */ |
|
976 /* from user to normalized coordinates. */ |
|
977 /* */ |
|
978 /* <InOut> */ |
|
979 /* face :: The font face. */ |
|
980 /* Initialize the blend struct with `gvar' data. */ |
|
981 /* */ |
|
982 /* <Input> */ |
|
983 /* num_coords :: This must be the axis count of the font. */ |
|
984 /* */ |
|
985 /* coords :: A coordinate array with `num_coords' elements. */ |
|
986 /* */ |
|
987 /* <Return> */ |
|
988 /* FreeType error code. 0 means success. */ |
|
989 /* */ |
|
990 FT_LOCAL_DEF( FT_Error ) |
|
991 TT_Set_Var_Design( TT_Face face, |
|
992 FT_UInt num_coords, |
|
993 FT_Fixed* coords ) |
|
994 { |
|
995 FT_Error error = TT_Err_Ok; |
|
996 FT_Fixed* normalized = NULL; |
|
997 GX_Blend blend; |
|
998 FT_MM_Var* mmvar; |
|
999 FT_UInt i, j; |
|
1000 FT_Var_Axis* a; |
|
1001 GX_AVarSegment av; |
|
1002 FT_Memory memory = face->root.memory; |
|
1003 |
|
1004 |
|
1005 if ( face->blend == NULL ) |
|
1006 { |
|
1007 if ( (error = TT_Get_MM_Var( face, NULL )) != 0 ) |
|
1008 goto Exit; |
|
1009 } |
|
1010 |
|
1011 blend = face->blend; |
|
1012 mmvar = blend->mmvar; |
|
1013 |
|
1014 if ( num_coords != mmvar->num_axis ) |
|
1015 { |
|
1016 error = TT_Err_Invalid_Argument; |
|
1017 goto Exit; |
|
1018 } |
|
1019 |
|
1020 /* Axis normalization is a two stage process. First we normalize */ |
|
1021 /* based on the [min,def,max] values for the axis to be [-1,0,1]. */ |
|
1022 /* Then, if there's an `avar' table, we renormalize this range. */ |
|
1023 |
|
1024 if ( FT_NEW_ARRAY( normalized, mmvar->num_axis ) ) |
|
1025 goto Exit; |
|
1026 |
|
1027 a = mmvar->axis; |
|
1028 for ( i = 0; i < mmvar->num_axis; ++i, ++a ) |
|
1029 { |
|
1030 if ( coords[i] > a->maximum || coords[i] < a->minimum ) |
|
1031 { |
|
1032 error = TT_Err_Invalid_Argument; |
|
1033 goto Exit; |
|
1034 } |
|
1035 |
|
1036 if ( coords[i] < a->def ) |
|
1037 { |
|
1038 normalized[i] = -FT_MulDiv( coords[i] - a->def, |
|
1039 0x10000L, |
|
1040 a->minimum - a->def ); |
|
1041 } |
|
1042 else if ( a->maximum == a->def ) |
|
1043 normalized[i] = 0; |
|
1044 else |
|
1045 { |
|
1046 normalized[i] = FT_MulDiv( coords[i] - a->def, |
|
1047 0x10000L, |
|
1048 a->maximum - a->def ); |
|
1049 } |
|
1050 } |
|
1051 |
|
1052 if ( !blend->avar_checked ) |
|
1053 ft_var_load_avar( face ); |
|
1054 |
|
1055 if ( blend->avar_segment != NULL ) |
|
1056 { |
|
1057 av = blend->avar_segment; |
|
1058 for ( i = 0; i < mmvar->num_axis; ++i, ++av ) |
|
1059 { |
|
1060 for ( j = 1; j < (FT_UInt)av->pairCount; ++j ) |
|
1061 if ( normalized[i] < av->correspondence[j].fromCoord ) |
|
1062 { |
|
1063 normalized[i] = |
|
1064 FT_MulDiv( |
|
1065 FT_MulDiv( |
|
1066 normalized[i] - av->correspondence[j - 1].fromCoord, |
|
1067 0x10000L, |
|
1068 av->correspondence[j].fromCoord - |
|
1069 av->correspondence[j - 1].fromCoord ), |
|
1070 av->correspondence[j].toCoord - |
|
1071 av->correspondence[j - 1].toCoord, |
|
1072 0x10000L ) + |
|
1073 av->correspondence[j - 1].toCoord; |
|
1074 break; |
|
1075 } |
|
1076 } |
|
1077 } |
|
1078 |
|
1079 error = TT_Set_MM_Blend( face, num_coords, normalized ); |
|
1080 |
|
1081 Exit: |
|
1082 FT_FREE( normalized ); |
|
1083 return error; |
|
1084 } |
|
1085 |
|
1086 |
|
1087 /*************************************************************************/ |
|
1088 /*************************************************************************/ |
|
1089 /***** *****/ |
|
1090 /***** GX VAR PARSING ROUTINES *****/ |
|
1091 /***** *****/ |
|
1092 /*************************************************************************/ |
|
1093 /*************************************************************************/ |
|
1094 |
|
1095 |
|
1096 /*************************************************************************/ |
|
1097 /* */ |
|
1098 /* <Function> */ |
|
1099 /* tt_face_vary_cvt */ |
|
1100 /* */ |
|
1101 /* <Description> */ |
|
1102 /* Modify the loaded cvt table according to the `cvar' table and the */ |
|
1103 /* font's blend. */ |
|
1104 /* */ |
|
1105 /* <InOut> */ |
|
1106 /* face :: A handle to the target face object. */ |
|
1107 /* */ |
|
1108 /* <Input> */ |
|
1109 /* stream :: A handle to the input stream. */ |
|
1110 /* */ |
|
1111 /* <Return> */ |
|
1112 /* FreeType error code. 0 means success. */ |
|
1113 /* */ |
|
1114 /* Most errors are ignored. It is perfectly valid not to have a */ |
|
1115 /* `cvar' table even if there is a `gvar' and `fvar' table. */ |
|
1116 /* */ |
|
1117 FT_LOCAL_DEF( FT_Error ) |
|
1118 tt_face_vary_cvt( TT_Face face, |
|
1119 FT_Stream stream ) |
|
1120 { |
|
1121 FT_Error error; |
|
1122 FT_Memory memory = stream->memory; |
|
1123 FT_ULong table_start; |
|
1124 FT_ULong table_len; |
|
1125 FT_UInt tupleCount; |
|
1126 FT_ULong offsetToData; |
|
1127 FT_ULong here; |
|
1128 FT_UInt i, j; |
|
1129 FT_Fixed* tuple_coords = NULL; |
|
1130 FT_Fixed* im_start_coords = NULL; |
|
1131 FT_Fixed* im_end_coords = NULL; |
|
1132 GX_Blend blend = face->blend; |
|
1133 FT_UInt point_count; |
|
1134 FT_UShort* localpoints; |
|
1135 FT_Short* deltas; |
|
1136 |
|
1137 |
|
1138 FT_TRACE2(( "CVAR " )); |
|
1139 |
|
1140 if ( blend == NULL ) |
|
1141 { |
|
1142 FT_TRACE2(( "tt_face_vary_cvt: no blend specified\n" )); |
|
1143 |
|
1144 error = TT_Err_Ok; |
|
1145 goto Exit; |
|
1146 } |
|
1147 |
|
1148 if ( face->cvt == NULL ) |
|
1149 { |
|
1150 FT_TRACE2(( "tt_face_vary_cvt: no `cvt ' table\n" )); |
|
1151 |
|
1152 error = TT_Err_Ok; |
|
1153 goto Exit; |
|
1154 } |
|
1155 |
|
1156 error = face->goto_table( face, TTAG_cvar, stream, &table_len ); |
|
1157 if ( error ) |
|
1158 { |
|
1159 FT_TRACE2(( "is missing\n" )); |
|
1160 |
|
1161 error = TT_Err_Ok; |
|
1162 goto Exit; |
|
1163 } |
|
1164 |
|
1165 if ( FT_FRAME_ENTER( table_len ) ) |
|
1166 { |
|
1167 error = TT_Err_Ok; |
|
1168 goto Exit; |
|
1169 } |
|
1170 |
|
1171 table_start = FT_Stream_FTell( stream ); |
|
1172 if ( FT_GET_LONG() != 0x00010000L ) |
|
1173 { |
|
1174 FT_TRACE2(( "bad table version\n" )); |
|
1175 |
|
1176 error = TT_Err_Ok; |
|
1177 goto FExit; |
|
1178 } |
|
1179 |
|
1180 if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) || |
|
1181 FT_NEW_ARRAY( im_start_coords, blend->num_axis ) || |
|
1182 FT_NEW_ARRAY( im_end_coords, blend->num_axis ) ) |
|
1183 goto FExit; |
|
1184 |
|
1185 tupleCount = FT_GET_USHORT(); |
|
1186 offsetToData = table_start + FT_GET_USHORT(); |
|
1187 |
|
1188 /* The documentation implies there are flags packed into the */ |
|
1189 /* tuplecount, but John Jenkins says that shared points don't apply */ |
|
1190 /* to `cvar', and no other flags are defined. */ |
|
1191 |
|
1192 for ( i = 0; i < ( tupleCount & 0xFFF ); ++i ) |
|
1193 { |
|
1194 FT_UInt tupleDataSize; |
|
1195 FT_UInt tupleIndex; |
|
1196 FT_Fixed apply; |
|
1197 |
|
1198 |
|
1199 tupleDataSize = FT_GET_USHORT(); |
|
1200 tupleIndex = FT_GET_USHORT(); |
|
1201 |
|
1202 /* There is no provision here for a global tuple coordinate section, */ |
|
1203 /* so John says. There are no tuple indices, just embedded tuples. */ |
|
1204 |
|
1205 if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD ) |
|
1206 { |
|
1207 for ( j = 0; j < blend->num_axis; ++j ) |
|
1208 tuple_coords[j] = FT_GET_SHORT() << 2; /* convert from */ |
|
1209 /* short frac to fixed */ |
|
1210 } |
|
1211 else |
|
1212 { |
|
1213 /* skip this tuple; it makes no sense */ |
|
1214 |
|
1215 if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) |
|
1216 for ( j = 0; j < 2 * blend->num_axis; ++j ) |
|
1217 (void)FT_GET_SHORT(); |
|
1218 |
|
1219 offsetToData += tupleDataSize; |
|
1220 continue; |
|
1221 } |
|
1222 |
|
1223 if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) |
|
1224 { |
|
1225 for ( j = 0; j < blend->num_axis; ++j ) |
|
1226 im_start_coords[j] = FT_GET_SHORT() << 2; |
|
1227 for ( j = 0; j < blend->num_axis; ++j ) |
|
1228 im_end_coords[j] = FT_GET_SHORT() << 2; |
|
1229 } |
|
1230 |
|
1231 apply = ft_var_apply_tuple( blend, |
|
1232 (FT_UShort)tupleIndex, |
|
1233 tuple_coords, |
|
1234 im_start_coords, |
|
1235 im_end_coords ); |
|
1236 if ( /* tuple isn't active for our blend */ |
|
1237 apply == 0 || |
|
1238 /* global points not allowed, */ |
|
1239 /* if they aren't local, makes no sense */ |
|
1240 !( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) ) |
|
1241 { |
|
1242 offsetToData += tupleDataSize; |
|
1243 continue; |
|
1244 } |
|
1245 |
|
1246 here = FT_Stream_FTell( stream ); |
|
1247 |
|
1248 FT_Stream_SeekSet( stream, offsetToData ); |
|
1249 |
|
1250 localpoints = ft_var_readpackedpoints( stream, &point_count ); |
|
1251 deltas = ft_var_readpackeddeltas( stream, |
|
1252 point_count == 0 ? face->cvt_size |
|
1253 : point_count ); |
|
1254 if ( localpoints == NULL || deltas == NULL ) |
|
1255 /* failure, ignore it */; |
|
1256 |
|
1257 else if ( localpoints == ALL_POINTS ) |
|
1258 { |
|
1259 /* this means that there are deltas for every entry in cvt */ |
|
1260 for ( j = 0; j < face->cvt_size; ++j ) |
|
1261 face->cvt[j] = (FT_Short)( face->cvt[j] + |
|
1262 FT_MulFix( deltas[j], apply ) ); |
|
1263 } |
|
1264 |
|
1265 else |
|
1266 { |
|
1267 for ( j = 0; j < point_count; ++j ) |
|
1268 { |
|
1269 int pindex = localpoints[j]; |
|
1270 |
|
1271 face->cvt[pindex] = (FT_Short)( face->cvt[pindex] + |
|
1272 FT_MulFix( deltas[j], apply ) ); |
|
1273 } |
|
1274 } |
|
1275 |
|
1276 if ( localpoints != ALL_POINTS ) |
|
1277 FT_FREE( localpoints ); |
|
1278 FT_FREE( deltas ); |
|
1279 |
|
1280 offsetToData += tupleDataSize; |
|
1281 |
|
1282 FT_Stream_SeekSet( stream, here ); |
|
1283 } |
|
1284 |
|
1285 FExit: |
|
1286 FT_FRAME_EXIT(); |
|
1287 |
|
1288 Exit: |
|
1289 FT_FREE( tuple_coords ); |
|
1290 FT_FREE( im_start_coords ); |
|
1291 FT_FREE( im_end_coords ); |
|
1292 |
|
1293 return error; |
|
1294 } |
|
1295 |
|
1296 |
|
1297 /*************************************************************************/ |
|
1298 /* */ |
|
1299 /* <Function> */ |
|
1300 /* TT_Vary_Get_Glyph_Deltas */ |
|
1301 /* */ |
|
1302 /* <Description> */ |
|
1303 /* Load the appropriate deltas for the current glyph. */ |
|
1304 /* */ |
|
1305 /* <Input> */ |
|
1306 /* face :: A handle to the target face object. */ |
|
1307 /* */ |
|
1308 /* glyph_index :: The index of the glyph being modified. */ |
|
1309 /* */ |
|
1310 /* n_points :: The number of the points in the glyph, including */ |
|
1311 /* phantom points. */ |
|
1312 /* */ |
|
1313 /* <Output> */ |
|
1314 /* deltas :: The array of points to change. */ |
|
1315 /* */ |
|
1316 /* <Return> */ |
|
1317 /* FreeType error code. 0 means success. */ |
|
1318 /* */ |
|
1319 FT_LOCAL_DEF( FT_Error ) |
|
1320 TT_Vary_Get_Glyph_Deltas( TT_Face face, |
|
1321 FT_UInt glyph_index, |
|
1322 FT_Vector* *deltas, |
|
1323 FT_UInt n_points ) |
|
1324 { |
|
1325 FT_Stream stream = face->root.stream; |
|
1326 FT_Memory memory = stream->memory; |
|
1327 GX_Blend blend = face->blend; |
|
1328 FT_Vector* delta_xy; |
|
1329 |
|
1330 FT_Error error; |
|
1331 FT_ULong glyph_start; |
|
1332 FT_UInt tupleCount; |
|
1333 FT_ULong offsetToData; |
|
1334 FT_ULong here; |
|
1335 FT_UInt i, j; |
|
1336 FT_Fixed* tuple_coords = NULL; |
|
1337 FT_Fixed* im_start_coords = NULL; |
|
1338 FT_Fixed* im_end_coords = NULL; |
|
1339 FT_UInt point_count, spoint_count = 0; |
|
1340 FT_UShort* sharedpoints = NULL; |
|
1341 FT_UShort* localpoints = NULL; |
|
1342 FT_UShort* points; |
|
1343 FT_Short *deltas_x, *deltas_y; |
|
1344 |
|
1345 |
|
1346 if ( !face->doblend || blend == NULL ) |
|
1347 return TT_Err_Invalid_Argument; |
|
1348 |
|
1349 /* to be freed by the caller */ |
|
1350 if ( FT_NEW_ARRAY( delta_xy, n_points ) ) |
|
1351 goto Exit; |
|
1352 *deltas = delta_xy; |
|
1353 |
|
1354 if ( glyph_index >= blend->gv_glyphcnt || |
|
1355 blend->glyphoffsets[glyph_index] == |
|
1356 blend->glyphoffsets[glyph_index + 1] ) |
|
1357 return TT_Err_Ok; /* no variation data for this glyph */ |
|
1358 |
|
1359 if ( FT_STREAM_SEEK( blend->glyphoffsets[glyph_index] ) || |
|
1360 FT_FRAME_ENTER( blend->glyphoffsets[glyph_index + 1] - |
|
1361 blend->glyphoffsets[glyph_index] ) ) |
|
1362 goto Fail1; |
|
1363 |
|
1364 glyph_start = FT_Stream_FTell( stream ); |
|
1365 |
|
1366 /* each set of glyph variation data is formatted similarly to `cvar' */ |
|
1367 /* (except we get shared points and global tuples) */ |
|
1368 |
|
1369 if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) || |
|
1370 FT_NEW_ARRAY( im_start_coords, blend->num_axis ) || |
|
1371 FT_NEW_ARRAY( im_end_coords, blend->num_axis ) ) |
|
1372 goto Fail2; |
|
1373 |
|
1374 tupleCount = FT_GET_USHORT(); |
|
1375 offsetToData = glyph_start + FT_GET_USHORT(); |
|
1376 |
|
1377 if ( tupleCount & GX_TC_TUPLES_SHARE_POINT_NUMBERS ) |
|
1378 { |
|
1379 here = FT_Stream_FTell( stream ); |
|
1380 |
|
1381 FT_Stream_SeekSet( stream, offsetToData ); |
|
1382 |
|
1383 sharedpoints = ft_var_readpackedpoints( stream, &spoint_count ); |
|
1384 offsetToData = FT_Stream_FTell( stream ); |
|
1385 |
|
1386 FT_Stream_SeekSet( stream, here ); |
|
1387 } |
|
1388 |
|
1389 for ( i = 0; i < ( tupleCount & GX_TC_TUPLE_COUNT_MASK ); ++i ) |
|
1390 { |
|
1391 FT_UInt tupleDataSize; |
|
1392 FT_UInt tupleIndex; |
|
1393 FT_Fixed apply; |
|
1394 |
|
1395 |
|
1396 tupleDataSize = FT_GET_USHORT(); |
|
1397 tupleIndex = FT_GET_USHORT(); |
|
1398 |
|
1399 if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD ) |
|
1400 { |
|
1401 for ( j = 0; j < blend->num_axis; ++j ) |
|
1402 tuple_coords[j] = FT_GET_SHORT() << 2; /* convert from */ |
|
1403 /* short frac to fixed */ |
|
1404 } |
|
1405 else if ( ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) >= blend->tuplecount ) |
|
1406 { |
|
1407 error = TT_Err_Invalid_Table; |
|
1408 goto Fail3; |
|
1409 } |
|
1410 else |
|
1411 { |
|
1412 FT_MEM_COPY( |
|
1413 tuple_coords, |
|
1414 &blend->tuplecoords[(tupleIndex & 0xFFF) * blend->num_axis], |
|
1415 blend->num_axis * sizeof ( FT_Fixed ) ); |
|
1416 } |
|
1417 |
|
1418 if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) |
|
1419 { |
|
1420 for ( j = 0; j < blend->num_axis; ++j ) |
|
1421 im_start_coords[j] = FT_GET_SHORT() << 2; |
|
1422 for ( j = 0; j < blend->num_axis; ++j ) |
|
1423 im_end_coords[j] = FT_GET_SHORT() << 2; |
|
1424 } |
|
1425 |
|
1426 apply = ft_var_apply_tuple( blend, |
|
1427 (FT_UShort)tupleIndex, |
|
1428 tuple_coords, |
|
1429 im_start_coords, |
|
1430 im_end_coords ); |
|
1431 |
|
1432 if ( apply == 0 ) /* tuple isn't active for our blend */ |
|
1433 { |
|
1434 offsetToData += tupleDataSize; |
|
1435 continue; |
|
1436 } |
|
1437 |
|
1438 here = FT_Stream_FTell( stream ); |
|
1439 |
|
1440 if ( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) |
|
1441 { |
|
1442 FT_Stream_SeekSet( stream, offsetToData ); |
|
1443 |
|
1444 localpoints = ft_var_readpackedpoints( stream, &point_count ); |
|
1445 points = localpoints; |
|
1446 } |
|
1447 else |
|
1448 { |
|
1449 points = sharedpoints; |
|
1450 point_count = spoint_count; |
|
1451 } |
|
1452 |
|
1453 deltas_x = ft_var_readpackeddeltas( stream, |
|
1454 point_count == 0 ? n_points |
|
1455 : point_count ); |
|
1456 deltas_y = ft_var_readpackeddeltas( stream, |
|
1457 point_count == 0 ? n_points |
|
1458 : point_count ); |
|
1459 |
|
1460 if ( points == NULL || deltas_y == NULL || deltas_x == NULL ) |
|
1461 ; /* failure, ignore it */ |
|
1462 |
|
1463 else if ( points == ALL_POINTS ) |
|
1464 { |
|
1465 /* this means that there are deltas for every point in the glyph */ |
|
1466 for ( j = 0; j < n_points; ++j ) |
|
1467 { |
|
1468 delta_xy[j].x += FT_MulFix( deltas_x[j], apply ); |
|
1469 delta_xy[j].y += FT_MulFix( deltas_y[j], apply ); |
|
1470 } |
|
1471 } |
|
1472 |
|
1473 else |
|
1474 { |
|
1475 for ( j = 0; j < point_count; ++j ) |
|
1476 { |
|
1477 delta_xy[localpoints[j]].x += FT_MulFix( deltas_x[j], apply ); |
|
1478 delta_xy[localpoints[j]].y += FT_MulFix( deltas_y[j], apply ); |
|
1479 } |
|
1480 } |
|
1481 |
|
1482 if ( localpoints != ALL_POINTS ) |
|
1483 FT_FREE( localpoints ); |
|
1484 FT_FREE( deltas_x ); |
|
1485 FT_FREE( deltas_y ); |
|
1486 |
|
1487 offsetToData += tupleDataSize; |
|
1488 |
|
1489 FT_Stream_SeekSet( stream, here ); |
|
1490 } |
|
1491 |
|
1492 Fail3: |
|
1493 FT_FREE( tuple_coords ); |
|
1494 FT_FREE( im_start_coords ); |
|
1495 FT_FREE( im_end_coords ); |
|
1496 |
|
1497 Fail2: |
|
1498 FT_FRAME_EXIT(); |
|
1499 |
|
1500 Fail1: |
|
1501 if ( error ) |
|
1502 { |
|
1503 FT_FREE( delta_xy ); |
|
1504 *deltas = NULL; |
|
1505 } |
|
1506 |
|
1507 Exit: |
|
1508 return error; |
|
1509 } |
|
1510 |
|
1511 |
|
1512 /*************************************************************************/ |
|
1513 /* */ |
|
1514 /* <Function> */ |
|
1515 /* tt_done_blend */ |
|
1516 /* */ |
|
1517 /* <Description> */ |
|
1518 /* Frees the blend internal data structure. */ |
|
1519 /* */ |
|
1520 FT_LOCAL_DEF( void ) |
|
1521 tt_done_blend( FT_Memory memory, |
|
1522 GX_Blend blend ) |
|
1523 { |
|
1524 if ( blend != NULL ) |
|
1525 { |
|
1526 FT_UInt i; |
|
1527 |
|
1528 |
|
1529 FT_FREE( blend->normalizedcoords ); |
|
1530 FT_FREE( blend->mmvar ); |
|
1531 |
|
1532 if ( blend->avar_segment != NULL ) |
|
1533 { |
|
1534 for ( i = 0; i < blend->num_axis; ++i ) |
|
1535 FT_FREE( blend->avar_segment[i].correspondence ); |
|
1536 FT_FREE( blend->avar_segment ); |
|
1537 } |
|
1538 |
|
1539 FT_FREE( blend->tuplecoords ); |
|
1540 FT_FREE( blend->glyphoffsets ); |
|
1541 FT_FREE( blend ); |
|
1542 } |
|
1543 } |
|
1544 |
|
1545 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ |
|
1546 |
|
1547 |
|
1548 /* END */ |
|