| 1 | /***************************************************************************/ |
| 2 | /* */ |
| 3 | /* t2driver.c */ |
| 4 | /* */ |
| 5 | /* OpenType font driver implementation (body). */ |
| 6 | /* */ |
| 7 | /* Copyright 1996-2000 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 | #include <freetype/freetype.h> |
| 20 | #include <freetype/internal/ftdebug.h> |
| 21 | #include <freetype/internal/ftstream.h> |
| 22 | #include <freetype/internal/sfnt.h> |
| 23 | #include <freetype/ttnameid.h> |
| 24 | |
| 25 | #include <freetype/internal/t2errors.h> |
| 26 | |
| 27 | |
| 28 | #ifdef FT_FLAT_COMPILE |
| 29 | |
| 30 | #include "t2driver.h" |
| 31 | #include "t2gload.h" |
| 32 | |
| 33 | #else |
| 34 | |
| 35 | #include <cff/t2driver.h> |
| 36 | #include <cff/t2gload.h> |
| 37 | |
| 38 | #endif |
| 39 | |
| 40 | |
| 41 | /*************************************************************************/ |
| 42 | /* */ |
| 43 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
| 44 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
| 45 | /* messages during execution. */ |
| 46 | /* */ |
| 47 | #undef FT_COMPONENT |
| 48 | #define FT_COMPONENT trace_t2driver |
| 49 | |
| 50 | |
| 51 | /*************************************************************************/ |
| 52 | /*************************************************************************/ |
| 53 | /*************************************************************************/ |
| 54 | /**** ****/ |
| 55 | /**** ****/ |
| 56 | /**** F A C E S ****/ |
| 57 | /**** ****/ |
| 58 | /**** ****/ |
| 59 | /*************************************************************************/ |
| 60 | /*************************************************************************/ |
| 61 | /*************************************************************************/ |
| 62 | |
| 63 | |
| 64 | #undef PAIR_TAG |
| 65 | #define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \ |
| 66 | (FT_ULong)right ) |
| 67 | |
| 68 | |
| 69 | /*************************************************************************/ |
| 70 | /* */ |
| 71 | /* <Function> */ |
| 72 | /* Get_Kerning */ |
| 73 | /* */ |
| 74 | /* <Description> */ |
| 75 | /* A driver method used to return the kerning vector between two */ |
| 76 | /* glyphs of the same face. */ |
| 77 | /* */ |
| 78 | /* <Input> */ |
| 79 | /* face :: A handle to the source face object. */ |
| 80 | /* */ |
| 81 | /* left_glyph :: The index of the left glyph in the kern pair. */ |
| 82 | /* */ |
| 83 | /* right_glyph :: The index of the right glyph in the kern pair. */ |
| 84 | /* */ |
| 85 | /* <Output> */ |
| 86 | /* kerning :: The kerning vector. This is in font units for */ |
| 87 | /* scalable formats, and in pixels for fixed-sizes */ |
| 88 | /* formats. */ |
| 89 | /* */ |
| 90 | /* <Return> */ |
| 91 | /* FreeType error code. 0 means success. */ |
| 92 | /* */ |
| 93 | /* <Note> */ |
| 94 | /* Only horizontal layouts (left-to-right & right-to-left) are */ |
| 95 | /* supported by this function. Other layouts, or more sophisticated */ |
| 96 | /* kernings, are out of scope of this method (the basic driver */ |
| 97 | /* interface is meant to be simple). */ |
| 98 | /* */ |
| 99 | /* They can be implemented by format-specific interfaces. */ |
| 100 | /* */ |
| 101 | static |
| 102 | FT_Error Get_Kerning( TT_Face face, |
| 103 | FT_UInt left_glyph, |
| 104 | FT_UInt right_glyph, |
| 105 | FT_Vector* kerning ) |
| 106 | { |
| 107 | TT_Kern_0_Pair* pair; |
| 108 | |
| 109 | |
| 110 | if ( !face ) |
| 111 | return T2_Err_Invalid_Face_Handle; |
| 112 | |
| 113 | kerning->x = 0; |
| 114 | kerning->y = 0; |
| 115 | |
| 116 | if ( face->kern_pairs ) |
| 117 | { |
| 118 | /* there are some kerning pairs in this font file! */ |
| 119 | FT_ULong search_tag = PAIR_TAG( left_glyph, right_glyph ); |
| 120 | FT_Long left, right; |
| 121 | |
| 122 | |
| 123 | left = 0; |
| 124 | right = face->num_kern_pairs - 1; |
| 125 | |
| 126 | while ( left <= right ) |
| 127 | { |
| 128 | FT_Int middle = left + ( ( right - left ) >> 1 ); |
| 129 | FT_ULong cur_pair; |
| 130 | |
| 131 | |
| 132 | pair = face->kern_pairs + middle; |
| 133 | cur_pair = PAIR_TAG( pair->left, pair->right ); |
| 134 | |
| 135 | if ( cur_pair == search_tag ) |
| 136 | goto Found; |
| 137 | |
| 138 | if ( cur_pair < search_tag ) |
| 139 | left = middle + 1; |
| 140 | else |
| 141 | right = middle - 1; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | Exit: |
| 146 | return T2_Err_Ok; |
| 147 | |
| 148 | Found: |
| 149 | kerning->x = pair->value; |
| 150 | goto Exit; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | #undef PAIR_TAG |
| 155 | |
| 156 | |
| 157 | /*************************************************************************/ |
| 158 | /* */ |
| 159 | /* <Function> */ |
| 160 | /* Load_Glyph */ |
| 161 | /* */ |
| 162 | /* <Description> */ |
| 163 | /* A driver method used to load a glyph within a given glyph slot. */ |
| 164 | /* */ |
| 165 | /* <Input> */ |
| 166 | /* slot :: A handle to the target slot object where the glyph */ |
| 167 | /* will be loaded. */ |
| 168 | /* */ |
| 169 | /* size :: A handle to the source face size at which the glyph */ |
| 170 | /* must be scaled, loaded, etc. */ |
| 171 | /* */ |
| 172 | /* glyph_index :: The index of the glyph in the font file. */ |
| 173 | /* */ |
| 174 | /* load_flags :: A flag indicating what to load for this glyph. The */ |
| 175 | /* FTLOAD_??? constants can be used to control the */ |
| 176 | /* glyph loading process (e.g., whether the outline */ |
| 177 | /* should be scaled, whether to load bitmaps or not, */ |
| 178 | /* whether to hint the outline, etc). */ |
| 179 | /* */ |
| 180 | /* <Return> */ |
| 181 | /* FreeType error code. 0 means success. */ |
| 182 | /* */ |
| 183 | static |
| 184 | FT_Error Load_Glyph( T2_GlyphSlot slot, |
| 185 | T2_Size size, |
| 186 | FT_UShort glyph_index, |
| 187 | FT_UInt load_flags ) |
| 188 | { |
| 189 | FT_Error error; |
| 190 | |
| 191 | |
| 192 | if ( !slot ) |
| 193 | return T2_Err_Invalid_Glyph_Handle; |
| 194 | |
| 195 | /* check whether we want a scaled outline or bitmap */ |
| 196 | if ( !size ) |
| 197 | load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; |
| 198 | |
| 199 | if ( load_flags & FT_LOAD_NO_SCALE ) |
| 200 | size = NULL; |
| 201 | |
| 202 | /* reset the size object if necessary */ |
| 203 | if ( size ) |
| 204 | { |
| 205 | /* these two object must have the same parent */ |
| 206 | if ( size->face != slot->root.face ) |
| 207 | return T2_Err_Invalid_Face_Handle; |
| 208 | } |
| 209 | |
| 210 | /* now load the glyph outline if necessary */ |
| 211 | error = T2_Load_Glyph( slot, size, glyph_index, load_flags ); |
| 212 | |
| 213 | /* force drop-out mode to 2 - irrelevant now */ |
| 214 | /* slot->outline.dropout_mode = 2; */ |
| 215 | |
| 216 | return error; |
| 217 | } |
| 218 | |
| 219 | |
| 220 | /*************************************************************************/ |
| 221 | /*************************************************************************/ |
| 222 | /*************************************************************************/ |
| 223 | /**** ****/ |
| 224 | /**** ****/ |
| 225 | /**** C H A R A C T E R M A P P I N G S ****/ |
| 226 | /**** ****/ |
| 227 | /**** ****/ |
| 228 | /*************************************************************************/ |
| 229 | /*************************************************************************/ |
| 230 | /*************************************************************************/ |
| 231 | |
| 232 | /*************************************************************************/ |
| 233 | /* */ |
| 234 | /* <Function> */ |
| 235 | /* Get_Char_Index */ |
| 236 | /* */ |
| 237 | /* <Description> */ |
| 238 | /* Uses a charmap to return a given character code's glyph index. */ |
| 239 | /* */ |
| 240 | /* <Input> */ |
| 241 | /* charmap :: A handle to the source charmap object. */ |
| 242 | /* charcode :: The character code. */ |
| 243 | /* */ |
| 244 | /* <Return> */ |
| 245 | /* Glyph index. 0 means `undefined character code'. */ |
| 246 | /* */ |
| 247 | static |
| 248 | FT_UInt t2_get_char_index( TT_CharMap charmap, |
| 249 | FT_Long charcode ) |
| 250 | { |
| 251 | FT_Error error; |
| 252 | T2_Face face; |
| 253 | TT_CMapTable* cmap; |
| 254 | |
| 255 | |
| 256 | cmap = &charmap->cmap; |
| 257 | face = (T2_Face)charmap->root.face; |
| 258 | |
| 259 | /* Load table if needed */ |
| 260 | if ( !cmap->loaded ) |
| 261 | { |
| 262 | SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt; |
| 263 | |
| 264 | |
| 265 | error = sfnt->load_charmap( face, cmap, face->root.stream ); |
| 266 | if ( error ) |
| 267 | return 0; |
| 268 | |
| 269 | cmap->loaded = TRUE; |
| 270 | } |
| 271 | |
| 272 | return ( cmap->get_index ? cmap->get_index( cmap, charcode ) : 0 ); |
| 273 | } |
| 274 | |
| 275 | |
| 276 | /*************************************************************************/ |
| 277 | /*************************************************************************/ |
| 278 | /*************************************************************************/ |
| 279 | /**** ****/ |
| 280 | /**** ****/ |
| 281 | /**** D R I V E R I N T E R F A C E ****/ |
| 282 | /**** ****/ |
| 283 | /**** ****/ |
| 284 | /*************************************************************************/ |
| 285 | /*************************************************************************/ |
| 286 | /*************************************************************************/ |
| 287 | |
| 288 | |
| 289 | static |
| 290 | FT_Module_Interface t2_get_interface( T2_Driver driver, |
| 291 | const char* interface ) |
| 292 | { |
| 293 | FT_Module sfnt; |
| 294 | |
| 295 | |
| 296 | /* we simply pass our request to the `sfnt' module */ |
| 297 | sfnt = FT_Get_Module( driver->root.root.library, "sfnt" ); |
| 298 | |
| 299 | return sfnt ? sfnt->clazz->get_interface( sfnt, interface ) : 0; |
| 300 | } |
| 301 | |
| 302 | |
| 303 | /* The FT_DriverInterface structure is defined in ftdriver.h. */ |
| 304 | |
| 305 | const FT_Driver_Class cff_driver_class = |
| 306 | { |
| 307 | /* begin with the FT_Module_Class fields */ |
| 308 | { |
| 309 | ft_module_font_driver | ft_module_driver_scalable, |
| 310 | sizeof( T2_DriverRec ), |
| 311 | "cff", |
| 312 | 0x10000L, |
| 313 | 0x20000L, |
| 314 | |
| 315 | 0, /* module-specific interface */ |
| 316 | |
| 317 | (FT_Module_Constructor)T2_Init_Driver, |
| 318 | (FT_Module_Destructor) T2_Done_Driver, |
| 319 | (FT_Module_Requester) t2_get_interface, |
| 320 | }, |
| 321 | |
| 322 | /* now the specific driver fields */ |
| 323 | sizeof( TT_FaceRec ), |
| 324 | sizeof( FT_SizeRec ), |
| 325 | sizeof( T2_GlyphSlotRec ), |
| 326 | |
| 327 | (FTDriver_initFace) T2_Init_Face, |
| 328 | (FTDriver_doneFace) T2_Done_Face, |
| 329 | (FTDriver_initSize) 0, |
| 330 | (FTDriver_doneSize) 0, |
| 331 | (FTDriver_initGlyphSlot)0, |
| 332 | (FTDriver_doneGlyphSlot)0, |
| 333 | |
| 334 | (FTDriver_setCharSizes) 0, |
| 335 | (FTDriver_setPixelSizes)0, |
| 336 | |
| 337 | (FTDriver_loadGlyph) Load_Glyph, |
| 338 | (FTDriver_getCharIndex) t2_get_char_index, |
| 339 | |
| 340 | (FTDriver_getKerning) Get_Kerning, |
| 341 | (FTDriver_attachFile) 0, |
| 342 | (FTDriver_getAdvances) 0 |
| 343 | }; |
| 344 | |
| 345 | |
| 346 | #ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS |
| 347 | |
| 348 | |
| 349 | /*************************************************************************/ |
| 350 | /* */ |
| 351 | /* <Function> */ |
| 352 | /* getDriverClass */ |
| 353 | /* */ |
| 354 | /* <Description> */ |
| 355 | /* This function is used when compiling the TrueType driver as a */ |
| 356 | /* shared library (`.DLL' or `.so'). It will be used by the */ |
| 357 | /* high-level library of FreeType to retrieve the address of the */ |
| 358 | /* driver's generic interface. */ |
| 359 | /* */ |
| 360 | /* It shouldn't be implemented in a static build, as each driver must */ |
| 361 | /* have the same function as an exported entry point. */ |
| 362 | /* */ |
| 363 | /* <Return> */ |
| 364 | /* The address of the TrueType's driver generic interface. The */ |
| 365 | /* format-specific interface can then be retrieved through the method */ |
| 366 | /* interface->get_format_interface. */ |
| 367 | /* */ |
| 368 | EXPORT_FUNC( FT_Driver_Class* ) getDriverClass( void ) |
| 369 | { |
| 370 | return &cff_driver_class; |
| 371 | } |
| 372 | |
| 373 | |
| 374 | #endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */ |
| 375 | |
| 376 | |
| 377 | /* END */ |