doc/fcpattern.fncs

   1 /*
   2  * fontconfig/doc/fcpattern.fncs
   3  *
   4  * Copyright © 2003 Keith Packard
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that
   9  * copyright notice and this permission notice appear in supporting
  10  * documentation, and that the name of the author(s) not be used in
  11  * advertising or publicity pertaining to distribution of the software without
  12  * specific, written prior permission.  The authors make no
  13  * representations about the suitability of this software for any purpose.  It
  14  * is provided "as is" without express or implied warranty.
  15  *
  16  * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  22  * PERFORMANCE OF THIS SOFTWARE.
  23  */
  24 @RET@           FcPattern *
  25 @FUNC@          FcPatternCreate
  26 @TYPE1@         void
  27 @PURPOSE@       Create a pattern
  28 @DESC@
  29 Creates a pattern with no properties; used to build patterns from scratch.
  30 @@
  31
  32 @RET@           FcPattern *
  33 @FUNC@          FcPatternDuplicate
  34 @TYPE1@         const FcPattern *               @ARG1@           p
  35 @PURPOSE@       Copy a pattern
  36 @DESC@
  37 Copy a pattern, returning a new pattern that matches
  38 <parameter>p</parameter>. Each pattern may be modified without affecting the
  39 other.
  40 @@
  41
  42 @RET@           void
  43 @FUNC@          FcPatternReference
  44 @TYPE1@         FcPattern *                     @ARG1@           p
  45 @PURPOSE@       Increment pattern reference count
  46 @DESC@
  47 Add another reference to <parameter>p</parameter>. Patterns are freed only
  48 when the reference count reaches zero.
  49 @@
  50
  51 @RET@           void
  52 @FUNC@          FcPatternDestroy
  53 @TYPE1@         FcPattern *                     @ARG1@           p
  54 @PURPOSE@       Destroy a pattern
  55 @DESC@
  56 Decrement the pattern reference count. If all references are gone, destroys
  57 the pattern, in the process destroying all related values.
  58 @@
  59
  60 @RET@           FcBool
  61 @FUNC@          FcPatternEqual
  62 @TYPE1@         const FcPattern *               @ARG1@          pa
  63 @TYPE2@         const FcPattern *               @ARG2@          pb
  64 @PURPOSE@       Compare patterns
  65 @DESC@
  66 Returns whether <parameter>pa</parameter> and <parameter>pb</parameter> are exactly alike.
  67 @@
  68
  69 @RET@           FcBool
  70 @FUNC@          FcPatternEqualSubset
  71 @TYPE1@         const FcPattern *               @ARG1@          pa
  72 @TYPE2@         const FcPattern *               @ARG2@          pb
  73 @TYPE3@         const FcObjectSet *             @ARG3@          os
  74 @PURPOSE@       Compare portions of patterns
  75 @DESC@
  76 Returns whether <parameter>pa</parameter> and <parameter>pb</parameter> have exactly the same values for all of the
  77 objects in <parameter>os</parameter>.
  78 @@
  79
  80 @RET@           FcPattern *
  81 @FUNC@          FcPatternFilter
  82 @TYPE1@         FcPattern *                     @ARG1@           p
  83 @TYPE2@         const FcObjectSet *             @ARG1@           os
  84 @PURPOSE@       Filter the objects of pattern
  85 @DESC@
  86 Returns a new pattern that only has those objects from
  87 <parameter>p</parameter> that are in <parameter>os</parameter>.
  88 If <parameter>os</parameter> is NULL, a duplicate of
  89 <parameter>p</parameter> is returned.
  90 @@
  91
  92 @RET@           FcChar32
  93 @FUNC@          FcPatternHash
  94 @TYPE1@         const FcPattern *               @ARG1@          p
  95 @PURPOSE@       Compute a pattern hash value
  96 @DESC@
  97 Returns a 32-bit number which is the same for any two patterns which are
  98 equal.
  99 @@
 100
 101 @RET@           FcBool
 102 @FUNC@          FcPatternAdd
 103 @TYPE1@         FcPattern *                     @ARG1@          p
 104 @TYPE2@         const char *                    @ARG2@          object
 105 @TYPE3@         FcValue%                        @ARG3@          value
 106 @TYPE4@         FcBool%                         @ARG4@          append
 107 @PURPOSE@       Add a value to a pattern
 108 @DESC@
 109 Adds a single value to the list of values associated with the property named
 110 `object<parameter>.  If `append</parameter> is FcTrue, the value is added at the end of any
 111 existing list, otherwise it is inserted at the begining.  `value' is saved
 112 (with FcValueSave) when inserted into the pattern so that the library
 113 retains no reference to any application-supplied data structure.
 114 @@
 115
 116 @RET@           FcBool
 117 @FUNC@          FcPatternAddWeak
 118 @TYPE1@         FcPattern *                     @ARG1@          p
 119 @TYPE2@         const char *                    @ARG2@          object
 120 @TYPE3@         FcValue%                        @ARG3@          value
 121 @TYPE4@         FcBool%                         @ARG4@          append
 122 @PURPOSE@       Add a value to a pattern with weak binding
 123 @DESC@
 124 FcPatternAddWeak is essentially the same as FcPatternAdd except that any
 125 values added to the list have binding <parameter>weak</parameter> instead of <parameter>strong</parameter>.
 126 @@
 127
 128 @TITLE@         FcPatternAdd-Type
 129 @RET@           FcBool
 130 @FUNC@          FcPatternAddInteger
 131 @TYPE1@         FcPattern *                     @ARG1@          p
 132 @TYPE2@         const char *                    @ARG2@          object
 133 @TYPE3@         int%                            @ARG3@          i
 134
 135 @PROTOTYPE+@
 136 @RET+@          FcBool
 137 @FUNC+@         FcPatternAddDouble
 138 @TYPE1+@        FcPattern *                     @ARG1+@         p
 139 @TYPE2+@        const char *                    @ARG2+@         object
 140 @TYPE3+@        double%                         @ARG3+@         d
 141
 142 @PROTOTYPE++@
 143 @RET++@         FcBool
 144 @FUNC++@        FcPatternAddString
 145 @TYPE1++@       FcPattern *                     @ARG1++@        p
 146 @TYPE2++@       const char *                    @ARG2++@        object
 147 @TYPE3++@       const FcChar8 *                 @ARG3++@        s
 148
 149 @PROTOTYPE+++@
 150 @RET+++@        FcBool
 151 @FUNC+++@       FcPatternAddMatrix
 152 @TYPE1+++@      FcPattern *                     @ARG1+++@       p
 153 @TYPE2+++@      const char *                    @ARG2+++@       object
 154 @TYPE3+++@      const FcMatrix *                @ARG3+++@       m
 155
 156 @PROTOTYPE++++@
 157 @RET++++@       FcBool
 158 @FUNC++++@      FcPatternAddCharSet
 159 @TYPE1++++@     FcPattern *                     @ARG1++++@      p
 160 @TYPE2++++@     const char *                    @ARG2++++@      object
 161 @TYPE3++++@     const FcCharSet *               @ARG3++++@      c
 162
 163 @PROTOTYPE+++++@
 164 @RET+++++@      FcBool
 165 @FUNC+++++@     FcPatternAddBool
 166 @TYPE1+++++@    FcPattern *                     @ARG1+++++@     p
 167 @TYPE2+++++@    const char *                    @ARG2+++++@     object
 168 @TYPE3+++++@    FcBool%                         @ARG3+++++@     b
 169
 170 @PROTOTYPE++++++@
 171 @RET++++++@     FcBool
 172 @FUNC++++++@    FcPatternAddFTFace
 173 @TYPE1++++++@   FcPattern *                     @ARG1++++++@    p
 174 @TYPE2++++++@   const char *                    @ARG2++++++@    object
 175 @TYPE3++++++@   const FT_Face                   @ARG3++++++@    f
 176
 177 @PROTOTYPE+++++++@
 178 @RET+++++++@    FcBool
 179 @FUNC+++++++@   FcPatternAddLangSet
 180 @TYPE1+++++++@  FcPattern *                     @ARG1+++++++@   p
 181 @TYPE2+++++++@  const char *                    @ARG2+++++++@   object
 182 @TYPE3+++++++@  const FcLangSet *               @ARG3+++++++@   l
 183
 184 @PURPOSE@       Add a typed value to a pattern
 185 @DESC@
 186 These are all convenience functions that insert objects of the specified
 187 type into the pattern.  Use these in preference to FcPatternAdd as they
 188 will provide compile-time typechecking.  These all append values to
 189 any existing list of values.
 190 @@
 191
 192 @RET@           FcResult
 193 @FUNC@          FcPatternGet
 194 @TYPE1@         FcPattern *                     @ARG1@          p
 195 @TYPE2@         const char *                    @ARG2@          object
 196 @TYPE3@         int%                            @ARG3@          id
 197 @TYPE4@         FcValue *                       @ARG4@          v
 198 @PURPOSE@       Return a value from a pattern
 199 @DESC@
 200 Returns in <parameter>v</parameter> the <parameter>id</parameter>'th value
 201 associated with the property <parameter>object</parameter>.
 202 The value returned is not a copy, but rather refers to the data stored
 203 within the pattern directly.  Applications must not free this value.
 204 @@
 205
 206 @TITLE@         FcPatternGet-Type
 207 @PROTOTYPE@
 208 @RET@           FcResult
 209 @FUNC@          FcPatternGetInteger
 210 @TYPE1@         FcPattern *                     @ARG1@          p
 211 @TYPE2@         const char *                    @ARG2@          object
 212 @TYPE3@         int%                            @ARG3@          n
 213 @TYPE4@         int *                           @ARG4@          i
 214
 215 @PROTOTYPE+@
 216 @RET+@          FcResult
 217 @FUNC+@         FcPatternGetDouble
 218 @TYPE1+@        FcPattern *                     @ARG1+@         p
 219 @TYPE2+@        const char *                    @ARG2+@         object
 220 @TYPE3+@        int%                            @ARG3+@         n
 221 @TYPE4+@        double *                        @ARG4+@         d
 222
 223 @PROTOTYPE++@
 224 @RET++@         FcResult
 225 @FUNC++@        FcPatternGetString
 226 @TYPE1++@       FcPattern *                     @ARG1++@        p
 227 @TYPE2++@       const char *                    @ARG2++@        object
 228 @TYPE3++@       int%                            @ARG3++@        n
 229 @TYPE4++@       FcChar8 **                      @ARG4++@        s
 230
 231 @PROTOTYPE+++@
 232 @RET+++@        FcResult
 233 @FUNC+++@       FcPatternGetMatrix
 234 @TYPE1+++@      FcPattern *                     @ARG1+++@       p
 235 @TYPE2+++@      const char *                    @ARG2+++@       object
 236 @TYPE3+++@      int%                            @ARG3+++@       n
 237 @TYPE4+++@      FcMatrix **                     @ARG4+++@       s
 238
 239 @PROTOTYPE++++@
 240 @RET++++@       FcResult
 241 @FUNC++++@      FcPatternGetCharSet
 242 @TYPE1++++@     FcPattern *                     @ARG1++++@      p
 243 @TYPE2++++@     const char *                    @ARG2++++@      object
 244 @TYPE3++++@     int%                            @ARG3++++@      n
 245 @TYPE4++++@     FcCharSet **                    @ARG4++++@      c
 246
 247 @PROTOTYPE+++++@
 248 @RET+++++@      FcResult
 249 @FUNC+++++@     FcPatternGetBool
 250 @TYPE1+++++@    FcPattern *                     @ARG1+++++@     p
 251 @TYPE2+++++@    const char *                    @ARG2+++++@     object
 252 @TYPE3+++++@    int%                            @ARG3+++++@     n
 253 @TYPE4+++++@    FcBool *                        @ARG4+++++@     b
 254
 255 @PROTOTYPE++++++@
 256 @RET++++++@     FcResult
 257 @FUNC++++++@    FcPatternGetFTFace
 258 @TYPE1++++++@   FcPattern *                     @ARG1++++++@    p
 259 @TYPE2++++++@   const char *                    @ARG2++++++@    object
 260 @TYPE3+++++@    int%                            @ARG3+++++@     n
 261 @TYPE3++++++@   FT_Face *                       @ARG3++++++@    f
 262
 263 @PROTOTYPE+++++++@
 264 @RET+++++++@    FcResult
 265 @FUNC+++++++@   FcPatternGetLangSet
 266 @TYPE1+++++++@  FcPattern *                     @ARG1+++++++@   p
 267 @TYPE2+++++++@  const char *                    @ARG2+++++++@   object
 268 @TYPE3+++++@    int%                            @ARG3+++++@     n
 269 @TYPE3+++++++@  FcLangSet **                    @ARG3+++++++@   l
 270
 271 @PURPOSE@       Return a typed value from a pattern
 272 @DESC@
 273 These are convenience functions that call FcPatternGet and verify that the
 274 returned data is of the expected type. They return FcResultTypeMismatch if
 275 this is not the case.  Note that these (like FcPatternGet) do not make a
 276 copy of any data structure referenced by the return value.  Use these
 277 in preference to FcPatternGet to provide compile-time typechecking.
 278 @@
 279
 280 @RET@           FcPattern *
 281 @FUNC@          FcPatternBuild
 282 @TYPE1@         FcPattern *                     @ARG1@          pattern
 283 @TYPE2@         ...
 284
 285 @PROTOTYPE+@
 286 @RET+@          FcPattern *
 287 @FUNC+@         FcPatternVaBuild
 288 @TYPE1+@        FcPattern *                     @ARG1+@         pattern
 289 @TYPE2+@        va_list%                        @ARG2+@         va
 290
 291 @PROTOTYPE++@
 292 @RET++@         void
 293 @FUNC++@        FcPatternVapBuild
 294 @TYPE1++@       FcPattern *                     @ARG1++@        result
 295 @TYPE2++@       FcPattern *                     @ARG2++@        pattern
 296 @TYPE3++@       va_list%                        @ARG3++@        va
 297
 298 @PURPOSE@       Create patterns from arguments
 299 @DESC@
 300 Builds a pattern using a list of objects, types and values.  Each
 301 value to be entered in the pattern is specified with three arguments:
 302 </para>
 303 <orderedlist>
 304 <listitem><para>
 305 Object name, a string describing the property to be added.
 306 </para></listitem><listitem><para>
 307 Object type, one of the FcType enumerated values
 308 </para></listitem><listitem><para>
 309 Value, not an FcValue, but the raw type as passed to any of the
 310 FcPatternAdd&lt;type&gt; functions.  Must match the type of the second
 311 argument.
 312 </para></listitem>
 313 </orderedlist>
 314 <para>
 315 The argument list is terminated by a null object name, no object type nor
 316 value need be passed for this.  The values are added to `pattern', if
 317 `pattern' is null, a new pattern is created.  In either case, the pattern is
 318 returned. Example
 319 </para>
 320 <programlisting>
 321 pattern = FcPatternBuild (0, FC_FAMILY, FcTypeString, "Times", (char *) 0);
 322 </programlisting>
 323 <para>
 324 FcPatternVaBuild is used when the arguments are already in the form of a
 325 varargs value. FcPatternVapBuild is a macro version of FcPatternVaBuild
 326 which returns its result directly in the <parameter>result</parameter>
 327 variable.
 328 @@
 329
 330 @RET@           FcBool
 331 @FUNC@          FcPatternDel
 332 @TYPE1@         FcPattern *                     @ARG1@          p
 333 @TYPE2@         const char *                    @ARG2@          object
 334 @PURPOSE@       Delete a property from a pattern
 335 @DESC@
 336 Deletes all values associated with the property `object', returning
 337 whether the property existed or not.
 338 @@
 339
 340 @RET@           FcBool
 341 @FUNC@          FcPatternRemove
 342 @TYPE1@         FcPattern *                     @ARG1@          p
 343 @TYPE2@         const char *                    @ARG2@          object
 344 @TYPE3@         int%                            @ARG3@          id
 345 @PURPOSE@       Remove one object of the specified type from the pattern
 346 @DESC@
 347 Removes the value associated with the property `object' at position `id', returning
 348 whether the property existed and had a value at that position or not.
 349 @@
 350
 351 @RET@           void
 352 @FUNC@          FcPatternPrint
 353 @TYPE1@         const FcPattern *               @ARG1@          p
 354 @PURPOSE@       Print a pattern for debugging
 355 @DESC@
 356 Prints an easily readable version of the pattern to stdout.  There is
 357 no provision for reparsing data in this format, it's just for diagnostics
 358 and debugging.
 359 @@
 360
 361 @RET@           void
 362 @FUNC@          FcDefaultSubstitute
 363 @TYPE1@         FcPattern *                     @ARG1@          pattern
 364 @PURPOSE@       Perform default substitutions in a pattern
 365 @DESC@
 366 Supplies default values for underspecified font patterns:
 367 <itemizedlist>
 368 <listitem><para>
 369 Patterns without a specified style or weight are set to Medium
 370 </para></listitem>
 371 <listitem><para>
 372 Patterns without a specified style or slant are set to Roman
 373 </para></listitem>
 374 <listitem><para>
 375 Patterns without a specified pixel size are given one computed from any
 376 specified point size (default 12), dpi (default 75) and scale (default 1).
 377 </para></listitem>
 378 </itemizedlist>
 379 @@
 380
 381 @RET@           FcPattern *
 382 @FUNC@          FcNameParse
 383 @TYPE1@         const FcChar8 *                 @ARG1@          name
 384 @PURPOSE@       Parse a pattern string
 385 @DESC@
 386 Converts <parameter>name</parameter> from the standard text format described above into a pattern.
 387 @@
 388
 389 @RET@           FcChar8 *
 390 @FUNC@          FcNameUnparse
 391 @TYPE1@         FcPattern *                     @ARG1@          pat
 392 @PURPOSE@       Convert a pattern back into a string that can be parsed
 393 @DESC@
 394 Converts the given pattern into the standard text format described above.
 395 The return value is not static, but instead refers to newly allocated memory
 396 which should be freed by the caller using free().
 397 @@