1 /***************************************************************************/ |
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2 /* */ |
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3 /* ttgxvar.h */ |
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4 /* */ |
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5 /* TrueType GX Font Variation loader (specification) */ |
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6 /* */ |
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7 /* Copyright 2004 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 #ifndef __TTGXVAR_H__ |
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20 #define __TTGXVAR_H__ |
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21 |
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22 |
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23 #include <ft2build.h> |
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24 #include "ttobjs.h" |
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25 |
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26 |
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27 FT_BEGIN_HEADER |
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28 |
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29 |
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30 /*************************************************************************/ |
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31 /* */ |
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32 /* <Struct> */ |
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33 /* GX_AVarCorrespondenceRec */ |
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34 /* */ |
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35 /* <Description> */ |
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36 /* A data structure representing `shortFracCorrespondence' in `avar' */ |
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37 /* table according to the specifications from Apple. */ |
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38 /* */ |
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39 typedef struct GX_AVarCorrespondenceRec_ |
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40 { |
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41 FT_Fixed fromCoord; |
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42 FT_Fixed toCoord; |
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43 |
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44 } GX_AVarCorrespondenceRec_, *GX_AVarCorrespondence; |
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45 |
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46 |
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47 /*************************************************************************/ |
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48 /* */ |
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49 /* <Struct> */ |
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50 /* GX_AVarRec */ |
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51 /* */ |
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52 /* <Description> */ |
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53 /* Data from the segment field of `avar' table. */ |
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54 /* There is one of these for each axis. */ |
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55 /* */ |
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56 typedef struct GX_AVarSegmentRec_ |
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57 { |
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58 FT_UShort pairCount; |
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59 GX_AVarCorrespondence correspondence; /* array with pairCount entries */ |
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60 |
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61 } GX_AVarSegmentRec, *GX_AVarSegment; |
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62 |
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63 |
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64 /*************************************************************************/ |
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65 /* */ |
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66 /* <Struct> */ |
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67 /* GX_BlendRec */ |
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68 /* */ |
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69 /* <Description> */ |
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70 /* Data for interpolating a font from a distortable font specified */ |
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71 /* by the GX *var tables ([fgca]var). */ |
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72 /* */ |
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73 /* <Fields> */ |
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74 /* num_axis :: The number of axes along which interpolation */ |
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75 /* may happen */ |
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76 /* */ |
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77 /* normalizedcoords :: A normalized value (between [-1,1]) indicating */ |
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78 /* the contribution along each axis to the final */ |
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79 /* interpolated font. */ |
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80 /* */ |
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81 typedef struct GX_BlendRec_ |
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82 { |
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83 FT_UInt num_axis; |
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84 FT_Fixed* normalizedcoords; |
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85 |
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86 FT_MM_Var* mmvar; |
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87 FT_Offset mmvar_len; |
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88 |
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89 FT_Bool avar_checked; |
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90 GX_AVarSegment avar_segment; |
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91 |
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92 FT_UInt tuplecount; /* shared tuples in `gvar' */ |
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93 FT_Fixed* tuplecoords; /* tuplecoords[tuplecount][num_axis] */ |
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94 |
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95 FT_UInt gv_glyphcnt; |
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96 FT_ULong* glyphoffsets; |
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97 |
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98 } GX_BlendRec; |
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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 /* <enum> */ |
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104 /* GX_TupleCountFlags */ |
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105 /* */ |
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106 /* <Description> */ |
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107 /* Flags used within the `TupleCount' field of the `gvar' table. */ |
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108 /* */ |
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109 typedef enum GX_TupleCountFlags_ |
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110 { |
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111 GX_TC_TUPLES_SHARE_POINT_NUMBERS = 0x8000, |
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112 GX_TC_RESERVED_TUPLE_FLAGS = 0x7000, |
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113 GX_TC_TUPLE_COUNT_MASK = 0x0FFF |
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114 |
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115 } GX_TupleCountFlags; |
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116 |
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117 |
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118 /*************************************************************************/ |
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119 /* */ |
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120 /* <enum> */ |
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121 /* GX_TupleIndexFlags */ |
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122 /* */ |
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123 /* <Description> */ |
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124 /* Flags used within the `TupleIndex' field of the `gvar' and `cvar' */ |
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125 /* tables. */ |
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126 /* */ |
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127 typedef enum GX_TupleIndexFlags_ |
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128 { |
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129 GX_TI_EMBEDDED_TUPLE_COORD = 0x8000, |
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130 GX_TI_INTERMEDIATE_TUPLE = 0x4000, |
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131 GX_TI_PRIVATE_POINT_NUMBERS = 0x2000, |
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132 GX_TI_RESERVED_TUPLE_FLAG = 0x1000, |
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133 GX_TI_TUPLE_INDEX_MASK = 0x0FFF |
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134 |
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135 } GX_TupleIndexFlags; |
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136 |
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137 |
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138 #define TTAG_wght FT_MAKE_TAG( 'w', 'g', 'h', 't' ) |
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139 #define TTAG_wdth FT_MAKE_TAG( 'w', 'd', 't', 'h' ) |
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140 #define TTAG_opsz FT_MAKE_TAG( 'o', 'p', 's', 'z' ) |
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141 #define TTAG_slnt FT_MAKE_TAG( 's', 'l', 'n', 't' ) |
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142 |
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143 |
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144 FT_LOCAL( FT_Error ) |
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145 TT_Set_MM_Blend( TT_Face face, |
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146 FT_UInt num_coords, |
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147 FT_Fixed* coords ); |
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148 |
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149 FT_LOCAL( FT_Error ) |
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150 TT_Set_Var_Design( TT_Face face, |
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151 FT_UInt num_coords, |
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152 FT_Fixed* coords ); |
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153 |
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154 FT_LOCAL( FT_Error ) |
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155 TT_Get_MM_Var( TT_Face face, |
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156 FT_MM_Var* *master ); |
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157 |
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158 |
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159 FT_LOCAL( FT_Error ) |
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160 tt_face_vary_cvt( TT_Face face, |
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161 FT_Stream stream ); |
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162 |
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163 |
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164 FT_LOCAL( FT_Error ) |
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165 TT_Vary_Get_Glyph_Deltas( TT_Face face, |
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166 FT_UInt glyph_index, |
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167 FT_Vector* *deltas, |
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168 FT_UInt n_points ); |
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169 |
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170 |
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171 FT_LOCAL( void ) |
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172 tt_done_blend( FT_Memory memory, |
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173 GX_Blend blend ); |
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174 |
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175 |
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176 FT_END_HEADER |
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177 |
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178 |
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179 #endif /* __TTGXVAR_H__ */ |
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180 |
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181 |
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182 /* END */ |
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