1 /***************************************************************************/ 2 /* */ 3 /* ftmm.h */ 4 /* */ 5 /* FreeType Multiple Master font interface (specification). */ 6 /* */ 7 /* Copyright 1996-2015 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #ifndef __FTMM_H__ 20 #define __FTMM_H__ 21 22 23 #include <ft2build.h> 24 #include FT_TYPE1_TABLES_H 25 26 27 FT_BEGIN_HEADER 28 29 30 /*************************************************************************/ 31 /* */ 32 /* <Section> */ 33 /* multiple_masters */ 34 /* */ 35 /* <Title> */ 36 /* Multiple Masters */ 37 /* */ 38 /* <Abstract> */ 39 /* How to manage Multiple Masters fonts. */ 40 /* */ 41 /* <Description> */ 42 /* The following types and functions are used to manage Multiple */ 43 /* Master fonts, i.e., the selection of specific design instances by */ 44 /* setting design axis coordinates. */ 45 /* */ 46 /* George Williams has extended this interface to make it work with */ 47 /* both Type~1 Multiple Masters fonts and GX distortable (var) */ 48 /* fonts. Some of these routines only work with MM fonts, others */ 49 /* will work with both types. They are similar enough that a */ 50 /* consistent interface makes sense. */ 51 /* */ 52 /*************************************************************************/ 53 54 55 /*************************************************************************/ 56 /* */ 57 /* <Struct> */ 58 /* FT_MM_Axis */ 59 /* */ 60 /* <Description> */ 61 /* A simple structure used to model a given axis in design space for */ 62 /* Multiple Masters fonts. */ 63 /* */ 64 /* This structure can't be used for GX var fonts. */ 65 /* */ 66 /* <Fields> */ 67 /* name :: The axis's name. */ 68 /* */ 69 /* minimum :: The axis's minimum design coordinate. */ 70 /* */ 71 /* maximum :: The axis's maximum design coordinate. */ 72 /* */ 73 typedef struct FT_MM_Axis_ 74 { 75 FT_String* name; 76 FT_Long minimum; 77 FT_Long maximum; 78 79 } FT_MM_Axis; 80 81 82 /*************************************************************************/ 83 /* */ 84 /* <Struct> */ 85 /* FT_Multi_Master */ 86 /* */ 87 /* <Description> */ 88 /* A structure used to model the axes and space of a Multiple Masters */ 89 /* font. */ 90 /* */ 91 /* This structure can't be used for GX var fonts. */ 92 /* */ 93 /* <Fields> */ 94 /* num_axis :: Number of axes. Cannot exceed~4. */ 95 /* */ 96 /* num_designs :: Number of designs; should be normally 2^num_axis */ 97 /* even though the Type~1 specification strangely */ 98 /* allows for intermediate designs to be present. */ 99 /* This number cannot exceed~16. */ 100 /* */ 101 /* axis :: A table of axis descriptors. */ 102 /* */ 103 typedef struct FT_Multi_Master_ 104 { 105 FT_UInt num_axis; 106 FT_UInt num_designs; 107 FT_MM_Axis axis[T1_MAX_MM_AXIS]; 108 109 } FT_Multi_Master; 110 111 112 /*************************************************************************/ 113 /* */ 114 /* <Struct> */ 115 /* FT_Var_Axis */ 116 /* */ 117 /* <Description> */ 118 /* A simple structure used to model a given axis in design space for */ 119 /* Multiple Masters and GX var fonts. */ 120 /* */ 121 /* <Fields> */ 122 /* name :: The axis's name. */ 123 /* Not always meaningful for GX. */ 124 /* */ 125 /* minimum :: The axis's minimum design coordinate. */ 126 /* */ 127 /* def :: The axis's default design coordinate. */ 128 /* FreeType computes meaningful default values for MM; it */ 129 /* is then an integer value, not in 16.16 format. */ 130 /* */ 131 /* maximum :: The axis's maximum design coordinate. */ 132 /* */ 133 /* tag :: The axis's tag (the GX equivalent to `name'). */ 134 /* FreeType provides default values for MM if possible. */ 135 /* */ 136 /* strid :: The entry in `name' table (another GX version of */ 137 /* `name'). */ 138 /* Not meaningful for MM. */ 139 /* */ 140 typedef struct FT_Var_Axis_ 141 { 142 FT_String* name; 143 144 FT_Fixed minimum; 145 FT_Fixed def; 146 FT_Fixed maximum; 147 148 FT_ULong tag; 149 FT_UInt strid; 150 151 } FT_Var_Axis; 152 153 154 /*************************************************************************/ 155 /* */ 156 /* <Struct> */ 157 /* FT_Var_Named_Style */ 158 /* */ 159 /* <Description> */ 160 /* A simple structure used to model a named style in a GX var font. */ 161 /* */ 162 /* This structure can't be used for MM fonts. */ 163 /* */ 164 /* <Fields> */ 165 /* coords :: The design coordinates for this style. */ 166 /* This is an array with one entry for each axis. */ 167 /* */ 168 /* strid :: The entry in `name' table identifying this style. */ 169 /* */ 170 typedef struct FT_Var_Named_Style_ 171 { 172 FT_Fixed* coords; 173 FT_UInt strid; 174 175 } FT_Var_Named_Style; 176 177 178 /*************************************************************************/ 179 /* */ 180 /* <Struct> */ 181 /* FT_MM_Var */ 182 /* */ 183 /* <Description> */ 184 /* A structure used to model the axes and space of a Multiple Masters */ 185 /* or GX var distortable font. */ 186 /* */ 187 /* Some fields are specific to one format and not to the other. */ 188 /* */ 189 /* <Fields> */ 190 /* num_axis :: The number of axes. The maximum value is~4 for */ 191 /* MM; no limit in GX. */ 192 /* */ 193 /* num_designs :: The number of designs; should be normally */ 194 /* 2^num_axis for MM fonts. Not meaningful for GX */ 195 /* (where every glyph could have a different */ 196 /* number of designs). */ 197 /* */ 198 /* num_namedstyles :: The number of named styles; only meaningful for */ 199 /* GX that allows certain design coordinates to */ 200 /* have a string ID (in the `name' table) */ 201 /* associated with them. The font can tell the */ 202 /* user that, for example, Weight=1.5 is `Bold'. */ 203 /* */ 204 /* axis :: An axis descriptor table. */ 205 /* GX fonts contain slightly more data than MM. */ 206 /* Memory management of this pointer is done */ 207 /* internally by FreeType. */ 208 /* */ 209 /* namedstyle :: A named style table. */ 210 /* Only meaningful with GX. */ 211 /* Memory management of this pointer is done */ 212 /* internally by FreeType. */ 213 /* */ 214 typedef struct FT_MM_Var_ 215 { 216 FT_UInt num_axis; 217 FT_UInt num_designs; 218 FT_UInt num_namedstyles; 219 FT_Var_Axis* axis; 220 FT_Var_Named_Style* namedstyle; 221 222 } FT_MM_Var; 223 224 225 /*************************************************************************/ 226 /* */ 227 /* <Function> */ 228 /* FT_Get_Multi_Master */ 229 /* */ 230 /* <Description> */ 231 /* Retrieve the Multiple Master descriptor of a given font. */ 232 /* */ 233 /* This function can't be used with GX fonts. */ 234 /* */ 235 /* <Input> */ 236 /* face :: A handle to the source face. */ 237 /* */ 238 /* <Output> */ 239 /* amaster :: The Multiple Masters descriptor. */ 240 /* */ 241 /* <Return> */ 242 /* FreeType error code. 0~means success. */ 243 /* */ 244 FT_EXPORT( FT_Error ) 245 FT_Get_Multi_Master( FT_Face face, 246 FT_Multi_Master *amaster ); 247 248 249 /*************************************************************************/ 250 /* */ 251 /* <Function> */ 252 /* FT_Get_MM_Var */ 253 /* */ 254 /* <Description> */ 255 /* Retrieve the Multiple Master/GX var descriptor of a given font. */ 256 /* */ 257 /* <Input> */ 258 /* face :: A handle to the source face. */ 259 /* */ 260 /* <Output> */ 261 /* amaster :: The Multiple Masters/GX var descriptor. */ 262 /* Allocates a data structure, which the user must */ 263 /* deallocate with `free' after use. */ 264 /* */ 265 /* <Return> */ 266 /* FreeType error code. 0~means success. */ 267 /* */ 268 FT_EXPORT( FT_Error ) 269 FT_Get_MM_Var( FT_Face face, 270 FT_MM_Var* *amaster ); 271 272 273 /*************************************************************************/ 274 /* */ 275 /* <Function> */ 276 /* FT_Set_MM_Design_Coordinates */ 277 /* */ 278 /* <Description> */ 279 /* For Multiple Masters fonts, choose an interpolated font design */ 280 /* through design coordinates. */ 281 /* */ 282 /* This function can't be used with GX fonts. */ 283 /* */ 284 /* <InOut> */ 285 /* face :: A handle to the source face. */ 286 /* */ 287 /* <Input> */ 288 /* num_coords :: The number of available design coordinates. If it */ 289 /* is larger than the number of axes, ignore the excess */ 290 /* values. If it is smaller than the number of axes, */ 291 /* use default values for the remaining axes. */ 292 /* */ 293 /* coords :: An array of design coordinates. */ 294 /* */ 295 /* <Return> */ 296 /* FreeType error code. 0~means success. */ 297 /* */ 298 FT_EXPORT( FT_Error ) 299 FT_Set_MM_Design_Coordinates( FT_Face face, 300 FT_UInt num_coords, 301 FT_Long* coords ); 302 303 304 /*************************************************************************/ 305 /* */ 306 /* <Function> */ 307 /* FT_Set_Var_Design_Coordinates */ 308 /* */ 309 /* <Description> */ 310 /* For Multiple Master or GX Var fonts, choose an interpolated font */ 311 /* design through design coordinates. */ 312 /* */ 313 /* <InOut> */ 314 /* face :: A handle to the source face. */ 315 /* */ 316 /* <Input> */ 317 /* num_coords :: The number of available design coordinates. If it */ 318 /* is larger than the number of axes, ignore the excess */ 319 /* values. If it is smaller than the number of axes, */ 320 /* use default values for the remaining axes. */ 321 /* */ 322 /* coords :: An array of design coordinates. */ 323 /* */ 324 /* <Return> */ 325 /* FreeType error code. 0~means success. */ 326 /* */ 327 FT_EXPORT( FT_Error ) 328 FT_Set_Var_Design_Coordinates( FT_Face face, 329 FT_UInt num_coords, 330 FT_Fixed* coords ); 331 332 333 /*************************************************************************/ 334 /* */ 335 /* <Function> */ 336 /* FT_Set_MM_Blend_Coordinates */ 337 /* */ 338 /* <Description> */ 339 /* For Multiple Masters and GX var fonts, choose an interpolated font */ 340 /* design through normalized blend coordinates. */ 341 /* */ 342 /* <InOut> */ 343 /* face :: A handle to the source face. */ 344 /* */ 345 /* <Input> */ 346 /* num_coords :: The number of available design coordinates. If it */ 347 /* is larger than the number of axes, ignore the excess */ 348 /* values. If it is smaller than the number of axes, */ 349 /* use default values for the remaining axes. */ 350 /* */ 351 /* coords :: The design coordinates array (each element must be */ 352 /* between 0 and 1.0). */ 353 /* */ 354 /* <Return> */ 355 /* FreeType error code. 0~means success. */ 356 /* */ 357 FT_EXPORT( FT_Error ) 358 FT_Set_MM_Blend_Coordinates( FT_Face face, 359 FT_UInt num_coords, 360 FT_Fixed* coords ); 361 362 363 /*************************************************************************/ 364 /* */ 365 /* <Function> */ 366 /* FT_Set_Var_Blend_Coordinates */ 367 /* */ 368 /* <Description> */ 369 /* This is another name of @FT_Set_MM_Blend_Coordinates. */ 370 /* */ 371 FT_EXPORT( FT_Error ) 372 FT_Set_Var_Blend_Coordinates( FT_Face face, 373 FT_UInt num_coords, 374 FT_Fixed* coords ); 375 376 /* */ 377 378 379 FT_END_HEADER 380 381 #endif /* __FTMM_H__ */ 382 383 384 /* END */ 385
