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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* cf2font.c */ | |
| 4 /* */ | |
| 5 /* Adobe's code for font instances (body). */ | |
| 6 /* */ | |
| 7 /* Copyright 2007-2013 Adobe Systems Incorporated. */ | |
| 8 /* */ | |
| 9 /* This software, and all works of authorship, whether in source or */ | |
| 10 /* object code form as indicated by the copyright notice(s) included */ | |
| 11 /* herein (collectively, the "Work") is made available, and may only be */ | |
| 12 /* used, modified, and distributed under the FreeType Project License, */ | |
| 13 /* LICENSE.TXT. Additionally, subject to the terms and conditions of the */ | |
| 14 /* FreeType Project License, each contributor to the Work hereby grants */ | |
| 15 /* to any individual or legal entity exercising permissions granted by */ | |
| 16 /* the FreeType Project License and this section (hereafter, "You" or */ | |
| 17 /* "Your") a perpetual, worldwide, non-exclusive, no-charge, */ | |
| 18 /* royalty-free, irrevocable (except as stated in this section) patent */ | |
| 19 /* license to make, have made, use, offer to sell, sell, import, and */ | |
| 20 /* otherwise transfer the Work, where such license applies only to those */ | |
| 21 /* patent claims licensable by such contributor that are necessarily */ | |
| 22 /* infringed by their contribution(s) alone or by combination of their */ | |
| 23 /* contribution(s) with the Work to which such contribution(s) was */ | |
| 24 /* submitted. If You institute patent litigation against any entity */ | |
| 25 /* (including a cross-claim or counterclaim in a lawsuit) alleging that */ | |
| 26 /* the Work or a contribution incorporated within the Work constitutes */ | |
| 27 /* direct or contributory patent infringement, then any patent licenses */ | |
| 28 /* granted to You under this License for that Work shall terminate as of */ | |
| 29 /* the date such litigation is filed. */ | |
| 30 /* */ | |
| 31 /* By using, modifying, or distributing the Work you indicate that you */ | |
| 32 /* have read and understood the terms and conditions of the */ | |
| 33 /* FreeType Project License as well as those provided in this section, */ | |
| 34 /* and you accept them fully. */ | |
| 35 /* */ | |
| 36 /***************************************************************************/ | |
| 37 | |
| 38 | |
| 39 #include "cf2ft.h" | |
| 40 | |
| 41 #include "cf2glue.h" | |
| 42 #include "cf2font.h" | |
| 43 #include "cf2error.h" | |
| 44 #include "cf2intrp.h" | |
| 45 | |
| 46 | |
| 47 /* Compute a stem darkening amount in character space. */ | |
| 48 static void | |
| 49 cf2_computeDarkening( CF2_Fixed emRatio, | |
| 50 CF2_Fixed ppem, | |
| 51 CF2_Fixed stemWidth, | |
| 52 CF2_Fixed* darkenAmount, | |
| 53 CF2_Fixed boldenAmount, | |
| 54 FT_Bool stemDarkened ) | |
| 55 { | |
| 56 /* Internal calculations are done in units per thousand for */ | |
| 57 /* convenience. */ | |
| 58 CF2_Fixed stemWidthPer1000, scaledStem; | |
| 59 | |
| 60 | |
| 61 *darkenAmount = 0; | |
| 62 | |
| 63 if ( boldenAmount == 0 && !stemDarkened ) | |
| 64 return; | |
| 65 | |
| 66 /* protect against range problems and divide by zero */ | |
| 67 if ( emRatio < cf2_floatToFixed( .01 ) ) | |
| 68 return; | |
| 69 | |
| 70 if ( stemDarkened ) | |
| 71 { | |
| 72 /* convert from true character space to 1000 unit character space; */ | |
| 73 /* add synthetic emboldening effect */ | |
| 74 | |
| 75 /* we have to assure that the computation of `scaledStem' */ | |
| 76 /* and `stemWidthPer1000' don't overflow */ | |
| 77 | |
| 78 stemWidthPer1000 = FT_MulFix( stemWidth + boldenAmount, emRatio ); | |
| 79 | |
| 80 if ( emRatio > CF2_FIXED_ONE && | |
| 81 stemWidthPer1000 <= ( stemWidth + boldenAmount ) ) | |
| 82 { | |
| 83 stemWidthPer1000 = 0; /* to pacify compiler */ | |
| 84 scaledStem = cf2_intToFixed( 2333 ); | |
| 85 } | |
| 86 else | |
| 87 { | |
| 88 scaledStem = FT_MulFix( stemWidthPer1000, ppem ); | |
| 89 | |
| 90 if ( ppem > CF2_FIXED_ONE && | |
| 91 scaledStem <= stemWidthPer1000 ) | |
| 92 scaledStem = cf2_intToFixed( 2333 ); | |
| 93 } | |
| 94 | |
| 95 /* | |
| 96 * Total darkening amount is computed in 1000 unit character space | |
| 97 * using the modified 5 part curve as Avalon rasterizer. | |
| 98 * The darkening amount is smaller for thicker stems. | |
| 99 * It becomes zero when the stem is thicker than 2.333 pixels. | |
| 100 * | |
| 101 * In Avalon rasterizer, | |
| 102 * | |
| 103 * darkenAmount = 0.5 pixels if scaledStem <= 0.5 pixels, | |
| 104 * darkenAmount = 0.333 pixels if 1 <= scaledStem <= 1.667 pixels, | |
| 105 * darkenAmount = 0 pixel if scaledStem >= 2.333 pixels, | |
| 106 * | |
| 107 * and piecewise linear in-between. | |
| 108 * | |
| 109 */ | |
| 110 if ( scaledStem < cf2_intToFixed( 500 ) ) | |
| 111 *darkenAmount = FT_DivFix( cf2_intToFixed( 400 ), ppem ); | |
| 112 | |
| 113 else if ( scaledStem < cf2_intToFixed( 1000 ) ) | |
| 114 *darkenAmount = FT_DivFix( cf2_intToFixed( 525 ), ppem ) - | |
| 115 FT_MulFix( stemWidthPer1000, | |
| 116 cf2_floatToFixed( .25 ) ); | |
| 117 | |
| 118 else if ( scaledStem < cf2_intToFixed( 1667 ) ) | |
| 119 *darkenAmount = FT_DivFix( cf2_intToFixed( 275 ), ppem ); | |
| 120 | |
| 121 else if ( scaledStem < cf2_intToFixed( 2333 ) ) | |
| 122 *darkenAmount = FT_DivFix( cf2_intToFixed( 963 ), ppem ) - | |
| 123 FT_MulFix( stemWidthPer1000, | |
| 124 cf2_floatToFixed( .413 ) ); | |
| 125 | |
| 126 /* use half the amount on each side and convert back to true */ | |
| 127 /* character space */ | |
| 128 *darkenAmount = FT_DivFix( *darkenAmount, 2 * emRatio ); | |
| 129 } | |
| 130 | |
| 131 /* add synthetic emboldening effect in character space */ | |
| 132 *darkenAmount += boldenAmount / 2; | |
| 133 } | |
| 134 | |
| 135 | |
| 136 /* set up values for the current FontDict and matrix */ | |
| 137 | |
| 138 /* caller's transform is adjusted for subpixel positioning */ | |
| 139 static void | |
| 140 cf2_font_setup( CF2_Font font, | |
| 141 const CF2_Matrix* transform ) | |
| 142 { | |
| 143 /* pointer to parsed font object */ | |
| 144 CFF_Decoder* decoder = font->decoder; | |
| 145 | |
| 146 FT_Bool needExtraSetup; | |
| 147 | |
| 148 /* character space units */ | |
| 149 CF2_Fixed boldenX = font->syntheticEmboldeningAmountX; | |
| 150 CF2_Fixed boldenY = font->syntheticEmboldeningAmountY; | |
| 151 | |
| 152 CF2_Fixed ppem; | |
| 153 | |
| 154 | |
| 155 /* clear previous error */ | |
| 156 font->error = FT_Err_Ok; | |
| 157 | |
| 158 /* if a CID fontDict has changed, we need to recompute some cached */ | |
| 159 /* data */ | |
| 160 needExtraSetup = | |
| 161 (FT_Bool)( font->lastSubfont != cf2_getSubfont( decoder ) ); | |
| 162 | |
| 163 /* if ppem has changed, we need to recompute some cached data */ | |
| 164 /* note: because of CID font matrix concatenation, ppem and transform */ | |
| 165 /* do not necessarily track. */ | |
| 166 ppem = cf2_getPpemY( decoder ); | |
| 167 if ( font->ppem != ppem ) | |
| 168 { | |
| 169 font->ppem = ppem; | |
| 170 needExtraSetup = TRUE; | |
| 171 } | |
| 172 | |
| 173 /* copy hinted flag on each call */ | |
| 174 font->hinted = (FT_Bool)( font->renderingFlags & CF2_FlagsHinted ); | |
| 175 | |
| 176 /* determine if transform has changed; */ | |
| 177 /* include Fontmatrix but ignore translation */ | |
| 178 if ( ft_memcmp( transform, | |
| 179 &font->currentTransform, | |
| 180 4 * sizeof ( CF2_Fixed ) ) != 0 ) | |
| 181 { | |
| 182 /* save `key' information for `cache of one' matrix data; */ | |
| 183 /* save client transform, without the translation */ | |
| 184 font->currentTransform = *transform; | |
| 185 font->currentTransform.tx = | |
| 186 font->currentTransform.ty = cf2_intToFixed( 0 ); | |
| 187 | |
| 188 /* TODO: FreeType transform is simple scalar; for now, use identity */ | |
| 189 /* for outer */ | |
| 190 font->innerTransform = *transform; | |
| 191 font->outerTransform.a = | |
| 192 font->outerTransform.d = cf2_intToFixed( 1 ); | |
| 193 font->outerTransform.b = | |
| 194 font->outerTransform.c = cf2_intToFixed( 0 ); | |
| 195 | |
| 196 needExtraSetup = TRUE; | |
| 197 } | |
| 198 | |
| 199 /* | |
| 200 * font->darkened is set to true if there is a stem darkening request or | |
| 201 * the font is synthetic emboldened. | |
| 202 * font->darkened controls whether to adjust blue zones, winding order, | |
| 203 * and hinting. | |
| 204 * | |
| 205 */ | |
| 206 if ( font->stemDarkened != ( font->renderingFlags & CF2_FlagsDarkened ) ) | |
| 207 { | |
| 208 font->stemDarkened = | |
| 209 (FT_Bool)( font->renderingFlags & CF2_FlagsDarkened ); | |
| 210 | |
| 211 /* blue zones depend on darkened flag */ | |
| 212 needExtraSetup = TRUE; | |
| 213 } | |
| 214 | |
| 215 /* recompute variables that are dependent on transform or FontDict or */ | |
| 216 /* darken flag */ | |
| 217 if ( needExtraSetup ) | |
| 218 { | |
| 219 /* StdVW is found in the private dictionary; */ | |
| 220 /* recompute darkening amounts whenever private dictionary or */ | |
| 221 /* transform change */ | |
| 222 /* Note: a rendering flag turns darkening on or off, so we want to */ | |
| 223 /* store the `on' amounts; */ | |
| 224 /* darkening amount is computed in character space */ | |
| 225 /* TODO: testing size-dependent darkening here; */ | |
| 226 /* what to do for rotations? */ | |
| 227 | |
| 228 CF2_Fixed emRatio; | |
| 229 CF2_Fixed stdHW; | |
| 230 CF2_Int unitsPerEm = font->unitsPerEm; | |
| 231 | |
| 232 | |
| 233 if ( unitsPerEm == 0 ) | |
| 234 unitsPerEm = 1000; | |
| 235 | |
| 236 ppem = FT_MAX( cf2_intToFixed( 4 ), | |
| 237 font->ppem ); /* use minimum ppem of 4 */ | |
| 238 | |
| 239 #if 0 | |
| 240 /* since vstem is measured in the x-direction, we use the `a' member */ | |
| 241 /* of the fontMatrix */ | |
| 242 emRatio = cf2_fixedFracMul( cf2_intToFixed( 1000 ), fontMatrix->a ); | |
| 243 #endif | |
| 244 | |
| 245 /* Freetype does not preserve the fontMatrix when parsing; use */ | |
| 246 /* unitsPerEm instead. */ | |
| 247 /* TODO: check precision of this */ | |
| 248 emRatio = cf2_intToFixed( 1000 ) / unitsPerEm; | |
| 249 font->stdVW = cf2_getStdVW( decoder ); | |
| 250 | |
| 251 if ( font->stdVW <= 0 ) | |
| 252 font->stdVW = FT_DivFix( cf2_intToFixed( 75 ), emRatio ); | |
| 253 | |
| 254 if ( boldenX > 0 ) | |
| 255 { | |
| 256 /* Ensure that boldenX is at least 1 pixel for synthetic bold font */ | |
| 257 /* (similar to what Avalon does) */ | |
| 258 boldenX = FT_MAX( boldenX, | |
| 259 FT_DivFix( cf2_intToFixed( unitsPerEm ), ppem ) ); | |
| 260 | |
| 261 /* Synthetic emboldening adds at least 1 pixel to darkenX, while */ | |
| 262 /* stem darkening adds at most half pixel. Since the purpose of */ | |
| 263 /* stem darkening (readability at small sizes) is met with */ | |
| 264 /* synthetic emboldening, no need to add stem darkening for a */ | |
| 265 /* synthetic bold font. */ | |
| 266 cf2_computeDarkening( emRatio, | |
| 267 ppem, | |
| 268 font->stdVW, | |
| 269 &font->darkenX, | |
| 270 boldenX, | |
| 271 FALSE ); | |
| 272 } | |
| 273 else | |
| 274 cf2_computeDarkening( emRatio, | |
| 275 ppem, | |
| 276 font->stdVW, | |
| 277 &font->darkenX, | |
| 278 0, | |
| 279 font->stemDarkened ); | |
| 280 | |
| 281 #if 0 | |
| 282 /* since hstem is measured in the y-direction, we use the `d' member */ | |
| 283 /* of the fontMatrix */ | |
| 284 /* TODO: use the same units per em as above; check this */ | |
| 285 emRatio = cf2_fixedFracMul( cf2_intToFixed( 1000 ), fontMatrix->d ); | |
| 286 #endif | |
| 287 | |
| 288 /* set the default stem width, because it must be the same for all */ | |
| 289 /* family members; */ | |
| 290 /* choose a constant for StdHW that depends on font contrast */ | |
| 291 stdHW = cf2_getStdHW( decoder ); | |
| 292 | |
| 293 if ( stdHW > 0 && font->stdVW > 2 * stdHW ) | |
| 294 font->stdHW = FT_DivFix( cf2_intToFixed( 75 ), emRatio ); | |
| 295 else | |
| 296 { | |
| 297 /* low contrast font gets less hstem darkening */ | |
| 298 font->stdHW = FT_DivFix( cf2_intToFixed( 110 ), emRatio ); | |
| 299 } | |
| 300 | |
| 301 cf2_computeDarkening( emRatio, | |
| 302 ppem, | |
| 303 font->stdHW, | |
| 304 &font->darkenY, | |
| 305 boldenY, | |
| 306 font->stemDarkened ); | |
| 307 | |
| 308 if ( font->darkenX != 0 || font->darkenY != 0 ) | |
| 309 font->darkened = TRUE; | |
| 310 else | |
| 311 font->darkened = FALSE; | |
| 312 | |
| 313 font->reverseWinding = FALSE; /* initial expectation is CCW */ | |
| 314 | |
| 315 /* compute blue zones for this instance */ | |
| 316 cf2_blues_init( &font->blues, font ); | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 | |
| 321 /* equivalent to AdobeGetOutline */ | |
| 322 FT_LOCAL_DEF( FT_Error ) | |
| 323 cf2_getGlyphOutline( CF2_Font font, | |
| 324 CF2_Buffer charstring, | |
| 325 const CF2_Matrix* transform, | |
| 326 CF2_F16Dot16* glyphWidth ) | |
| 327 { | |
| 328 FT_Error lastError = FT_Err_Ok; | |
| 329 | |
| 330 FT_Vector translation; | |
| 331 | |
| 332 #if 0 | |
| 333 FT_Vector advancePoint; | |
| 334 #endif | |
| 335 | |
| 336 CF2_Fixed advWidth = 0; | |
| 337 FT_Bool needWinding; | |
| 338 | |
| 339 | |
| 340 /* Note: use both integer and fraction for outlines. This allows bbox */ | |
| 341 /* to come out directly. */ | |
| 342 | |
| 343 translation.x = transform->tx; | |
| 344 translation.y = transform->ty; | |
| 345 | |
| 346 /* set up values based on transform */ | |
| 347 cf2_font_setup( font, transform ); | |
| 348 if ( font->error ) | |
| 349 goto exit; /* setup encountered an error */ | |
| 350 | |
| 351 /* reset darken direction */ | |
| 352 font->reverseWinding = FALSE; | |
| 353 | |
| 354 /* winding order only affects darkening */ | |
| 355 needWinding = font->darkened; | |
| 356 | |
| 357 while ( 1 ) | |
| 358 { | |
| 359 /* reset output buffer */ | |
| 360 cf2_outline_reset( &font->outline ); | |
| 361 | |
| 362 /* build the outline, passing the full translation */ | |
| 363 cf2_interpT2CharString( font, | |
| 364 charstring, | |
| 365 (CF2_OutlineCallbacks)&font->outline, | |
| 366 &translation, | |
| 367 FALSE, | |
| 368 0, | |
| 369 0, | |
| 370 &advWidth ); | |
| 371 | |
| 372 if ( font->error ) | |
| 373 goto exit; | |
| 374 | |
| 375 if ( !needWinding ) | |
| 376 break; | |
| 377 | |
| 378 /* check winding order */ | |
| 379 if ( font->outline.root.windingMomentum >= 0 ) /* CFF is CCW */ | |
| 380 break; | |
| 381 | |
| 382 /* invert darkening and render again */ | |
| 383 /* TODO: this should be a parameter to getOutline-computeOffset */ | |
| 384 font->reverseWinding = TRUE; | |
| 385 | |
| 386 needWinding = FALSE; /* exit after next iteration */ | |
| 387 } | |
| 388 | |
| 389 /* finish storing client outline */ | |
| 390 cf2_outline_close( &font->outline ); | |
| 391 | |
| 392 exit: | |
| 393 /* FreeType just wants the advance width; there is no translation */ | |
| 394 *glyphWidth = advWidth; | |
| 395 | |
| 396 /* free resources and collect errors from objects we've used */ | |
| 397 cf2_setError( &font->error, lastError ); | |
| 398 | |
| 399 return font->error; | |
| 400 } | |
| 401 | |
| 402 | |
| 403 /* END */ | |
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Chromium Code Reviews
Issue 815103002:
Update freetype to 2.5.4. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master