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ftmm.h
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00001 /***************************************************************************/ 00002 /* */ 00003 /* ftmm.h */ 00004 /* */ 00005 /* FreeType Multiple Master font interface (specification). */ 00006 /* */ 00007 /* Copyright 1996-2001, 2003, 2004, 2006, 2009 by */ 00008 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 00009 /* */ 00010 /* This file is part of the FreeType project, and may only be used, */ 00011 /* modified, and distributed under the terms of the FreeType project */ 00012 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 00013 /* this file you indicate that you have read the license and */ 00014 /* understand and accept it fully. */ 00015 /* */ 00016 /***************************************************************************/ 00017 00018 00019 #ifndef __FTMM_H__ 00020 #define __FTMM_H__ 00021 00022 00023 #include <ft2build.h> 00024 #include FT_TYPE1_TABLES_H 00025 00026 00027 FT_BEGIN_HEADER 00028 00029 00030 /*************************************************************************/ 00031 /* */ 00032 /* <Section> */ 00033 /* multiple_masters */ 00034 /* */ 00035 /* <Title> */ 00036 /* Multiple Masters */ 00037 /* */ 00038 /* <Abstract> */ 00039 /* How to manage Multiple Masters fonts. */ 00040 /* */ 00041 /* <Description> */ 00042 /* The following types and functions are used to manage Multiple */ 00043 /* Master fonts, i.e., the selection of specific design instances by */ 00044 /* setting design axis coordinates. */ 00045 /* */ 00046 /* George Williams has extended this interface to make it work with */ 00047 /* both Type~1 Multiple Masters fonts and GX distortable (var) */ 00048 /* fonts. Some of these routines only work with MM fonts, others */ 00049 /* will work with both types. They are similar enough that a */ 00050 /* consistent interface makes sense. */ 00051 /* */ 00052 /*************************************************************************/ 00053 00054 00055 /*************************************************************************/ 00056 /* */ 00057 /* <Struct> */ 00058 /* FT_MM_Axis */ 00059 /* */ 00060 /* <Description> */ 00061 /* A simple structure used to model a given axis in design space for */ 00062 /* Multiple Masters fonts. */ 00063 /* */ 00064 /* This structure can't be used for GX var fonts. */ 00065 /* */ 00066 /* <Fields> */ 00067 /* name :: The axis's name. */ 00068 /* */ 00069 /* minimum :: The axis's minimum design coordinate. */ 00070 /* */ 00071 /* maximum :: The axis's maximum design coordinate. */ 00072 /* */ 00073 typedef struct FT_MM_Axis_ 00074 { 00075 FT_String* name; 00076 FT_Long minimum; 00077 FT_Long maximum; 00078 00079 } FT_MM_Axis; 00080 00081 00082 /*************************************************************************/ 00083 /* */ 00084 /* <Struct> */ 00085 /* FT_Multi_Master */ 00086 /* */ 00087 /* <Description> */ 00088 /* A structure used to model the axes and space of a Multiple Masters */ 00089 /* font. */ 00090 /* */ 00091 /* This structure can't be used for GX var fonts. */ 00092 /* */ 00093 /* <Fields> */ 00094 /* num_axis :: Number of axes. Cannot exceed~4. */ 00095 /* */ 00096 /* num_designs :: Number of designs; should be normally 2^num_axis */ 00097 /* even though the Type~1 specification strangely */ 00098 /* allows for intermediate designs to be present. This */ 00099 /* number cannot exceed~16. */ 00100 /* */ 00101 /* axis :: A table of axis descriptors. */ 00102 /* */ 00103 typedef struct FT_Multi_Master_ 00104 { 00105 FT_UInt num_axis; 00106 FT_UInt num_designs; 00107 FT_MM_Axis axis[T1_MAX_MM_AXIS]; 00108 00109 } FT_Multi_Master; 00110 00111 00112 /*************************************************************************/ 00113 /* */ 00114 /* <Struct> */ 00115 /* FT_Var_Axis */ 00116 /* */ 00117 /* <Description> */ 00118 /* A simple structure used to model a given axis in design space for */ 00119 /* Multiple Masters and GX var fonts. */ 00120 /* */ 00121 /* <Fields> */ 00122 /* name :: The axis's name. */ 00123 /* Not always meaningful for GX. */ 00124 /* */ 00125 /* minimum :: The axis's minimum design coordinate. */ 00126 /* */ 00127 /* def :: The axis's default design coordinate. */ 00128 /* FreeType computes meaningful default values for MM; it */ 00129 /* is then an integer value, not in 16.16 format. */ 00130 /* */ 00131 /* maximum :: The axis's maximum design coordinate. */ 00132 /* */ 00133 /* tag :: The axis's tag (the GX equivalent to `name'). */ 00134 /* FreeType provides default values for MM if possible. */ 00135 /* */ 00136 /* strid :: The entry in `name' table (another GX version of */ 00137 /* `name'). */ 00138 /* Not meaningful for MM. */ 00139 /* */ 00140 typedef struct FT_Var_Axis_ 00141 { 00142 FT_String* name; 00143 00144 FT_Fixed minimum; 00145 FT_Fixed def; 00146 FT_Fixed maximum; 00147 00148 FT_ULong tag; 00149 FT_UInt strid; 00150 00151 } FT_Var_Axis; 00152 00153 00154 /*************************************************************************/ 00155 /* */ 00156 /* <Struct> */ 00157 /* FT_Var_Named_Style */ 00158 /* */ 00159 /* <Description> */ 00160 /* A simple structure used to model a named style in a GX var font. */ 00161 /* */ 00162 /* This structure can't be used for MM fonts. */ 00163 /* */ 00164 /* <Fields> */ 00165 /* coords :: The design coordinates for this style. */ 00166 /* This is an array with one entry for each axis. */ 00167 /* */ 00168 /* strid :: The entry in `name' table identifying this style. */ 00169 /* */ 00170 typedef struct FT_Var_Named_Style_ 00171 { 00172 FT_Fixed* coords; 00173 FT_UInt strid; 00174 00175 } FT_Var_Named_Style; 00176 00177 00178 /*************************************************************************/ 00179 /* */ 00180 /* <Struct> */ 00181 /* FT_MM_Var */ 00182 /* */ 00183 /* <Description> */ 00184 /* A structure used to model the axes and space of a Multiple Masters */ 00185 /* or GX var distortable font. */ 00186 /* */ 00187 /* Some fields are specific to one format and not to the other. */ 00188 /* */ 00189 /* <Fields> */ 00190 /* num_axis :: The number of axes. The maximum value is~4 for */ 00191 /* MM; no limit in GX. */ 00192 /* */ 00193 /* num_designs :: The number of designs; should be normally */ 00194 /* 2^num_axis for MM fonts. Not meaningful for GX */ 00195 /* (where every glyph could have a different */ 00196 /* number of designs). */ 00197 /* */ 00198 /* num_namedstyles :: The number of named styles; only meaningful for */ 00199 /* GX which allows certain design coordinates to */ 00200 /* have a string ID (in the `name' table) */ 00201 /* associated with them. The font can tell the */ 00202 /* user that, for example, Weight=1.5 is `Bold'. */ 00203 /* */ 00204 /* axis :: A table of axis descriptors. */ 00205 /* GX fonts contain slightly more data than MM. */ 00206 /* */ 00207 /* namedstyles :: A table of named styles. */ 00208 /* Only meaningful with GX. */ 00209 /* */ 00210 typedef struct FT_MM_Var_ 00211 { 00212 FT_UInt num_axis; 00213 FT_UInt num_designs; 00214 FT_UInt num_namedstyles; 00215 FT_Var_Axis* axis; 00216 FT_Var_Named_Style* namedstyle; 00217 00218 } FT_MM_Var; 00219 00220 00221 /* */ 00222 00223 00224 /*************************************************************************/ 00225 /* */ 00226 /* <Function> */ 00227 /* FT_Get_Multi_Master */ 00228 /* */ 00229 /* <Description> */ 00230 /* Retrieve the Multiple Master descriptor of a given font. */ 00231 /* */ 00232 /* This function can't be used with GX fonts. */ 00233 /* */ 00234 /* <Input> */ 00235 /* face :: A handle to the source face. */ 00236 /* */ 00237 /* <Output> */ 00238 /* amaster :: The Multiple Masters descriptor. */ 00239 /* */ 00240 /* <Return> */ 00241 /* FreeType error code. 0~means success. */ 00242 /* */ 00243 FT_EXPORT( FT_Error ) 00244 FT_Get_Multi_Master( FT_Face face, 00245 FT_Multi_Master *amaster ); 00246 00247 00248 /*************************************************************************/ 00249 /* */ 00250 /* <Function> */ 00251 /* FT_Get_MM_Var */ 00252 /* */ 00253 /* <Description> */ 00254 /* Retrieve the Multiple Master/GX var descriptor of a given font. */ 00255 /* */ 00256 /* <Input> */ 00257 /* face :: A handle to the source face. */ 00258 /* */ 00259 /* <Output> */ 00260 /* amaster :: The Multiple Masters/GX var descriptor. */ 00261 /* Allocates a data structure, which the user must free */ 00262 /* (a single call to FT_FREE will do it). */ 00263 /* */ 00264 /* <Return> */ 00265 /* FreeType error code. 0~means success. */ 00266 /* */ 00267 FT_EXPORT( FT_Error ) 00268 FT_Get_MM_Var( FT_Face face, 00269 FT_MM_Var* *amaster ); 00270 00271 00272 /*************************************************************************/ 00273 /* */ 00274 /* <Function> */ 00275 /* FT_Set_MM_Design_Coordinates */ 00276 /* */ 00277 /* <Description> */ 00278 /* For Multiple Masters fonts, choose an interpolated font design */ 00279 /* through design coordinates. */ 00280 /* */ 00281 /* This function can't be used with GX fonts. */ 00282 /* */ 00283 /* <InOut> */ 00284 /* face :: A handle to the source face. */ 00285 /* */ 00286 /* <Input> */ 00287 /* num_coords :: The number of design coordinates (must be equal to */ 00288 /* the number of axes in the font). */ 00289 /* */ 00290 /* coords :: An array of design coordinates. */ 00291 /* */ 00292 /* <Return> */ 00293 /* FreeType error code. 0~means success. */ 00294 /* */ 00295 FT_EXPORT( FT_Error ) 00296 FT_Set_MM_Design_Coordinates( FT_Face face, 00297 FT_UInt num_coords, 00298 FT_Long* coords ); 00299 00300 00301 /*************************************************************************/ 00302 /* */ 00303 /* <Function> */ 00304 /* FT_Set_Var_Design_Coordinates */ 00305 /* */ 00306 /* <Description> */ 00307 /* For Multiple Master or GX Var fonts, choose an interpolated font */ 00308 /* design through design coordinates. */ 00309 /* */ 00310 /* <InOut> */ 00311 /* face :: A handle to the source face. */ 00312 /* */ 00313 /* <Input> */ 00314 /* num_coords :: The number of design coordinates (must be equal to */ 00315 /* the number of axes in the font). */ 00316 /* */ 00317 /* coords :: An array of design coordinates. */ 00318 /* */ 00319 /* <Return> */ 00320 /* FreeType error code. 0~means success. */ 00321 /* */ 00322 FT_EXPORT( FT_Error ) 00323 FT_Set_Var_Design_Coordinates( FT_Face face, 00324 FT_UInt num_coords, 00325 FT_Fixed* coords ); 00326 00327 00328 /*************************************************************************/ 00329 /* */ 00330 /* <Function> */ 00331 /* FT_Set_MM_Blend_Coordinates */ 00332 /* */ 00333 /* <Description> */ 00334 /* For Multiple Masters and GX var fonts, choose an interpolated font */ 00335 /* design through normalized blend coordinates. */ 00336 /* */ 00337 /* <InOut> */ 00338 /* face :: A handle to the source face. */ 00339 /* */ 00340 /* <Input> */ 00341 /* num_coords :: The number of design coordinates (must be equal to */ 00342 /* the number of axes in the font). */ 00343 /* */ 00344 /* coords :: The design coordinates array (each element must be */ 00345 /* between 0 and 1.0). */ 00346 /* */ 00347 /* <Return> */ 00348 /* FreeType error code. 0~means success. */ 00349 /* */ 00350 FT_EXPORT( FT_Error ) 00351 FT_Set_MM_Blend_Coordinates( FT_Face face, 00352 FT_UInt num_coords, 00353 FT_Fixed* coords ); 00354 00355 00356 /*************************************************************************/ 00357 /* */ 00358 /* <Function> */ 00359 /* FT_Set_Var_Blend_Coordinates */ 00360 /* */ 00361 /* <Description> */ 00362 /* This is another name of @FT_Set_MM_Blend_Coordinates. */ 00363 /* */ 00364 FT_EXPORT( FT_Error ) 00365 FT_Set_Var_Blend_Coordinates( FT_Face face, 00366 FT_UInt num_coords, 00367 FT_Fixed* coords ); 00368 00369 00370 /* */ 00371 00372 00373 FT_END_HEADER 00374 00375 #endif /* __FTMM_H__ */ 00376 00377 00378 /* END */
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