ReactOS  0.4.14-dev-1034-g1e60116
ttsubpix.c
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1 /***************************************************************************/
2 /* */
3 /* ttsubpix.c */
4 /* */
5 /* TrueType Subpixel Hinting. */
6 /* */
7 /* Copyright 2010-2018 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 #include <ft2build.h>
19 #include FT_INTERNAL_DEBUG_H
20 #include FT_INTERNAL_CALC_H
21 #include FT_INTERNAL_STREAM_H
22 #include FT_INTERNAL_SFNT_H
23 #include FT_TRUETYPE_TAGS_H
24 #include FT_OUTLINE_H
25 #include FT_DRIVER_H
26 
27 #include "ttsubpix.h"
28 
29 
30 #if defined( TT_USE_BYTECODE_INTERPRETER ) && \
31  defined( TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY )
32 
33  /*************************************************************************/
34  /* */
35  /* These rules affect how the TT Interpreter does hinting, with the */
36  /* goal of doing subpixel hinting by (in general) ignoring x moves. */
37  /* Some of these rules are fixes that go above and beyond the */
38  /* stated techniques in the MS whitepaper on Cleartype, due to */
39  /* artifacts in many glyphs. So, these rules make some glyphs render */
40  /* better than they do in the MS rasterizer. */
41  /* */
42  /* "" string or 0 int/char indicates to apply to all glyphs. */
43  /* "-" used as dummy placeholders, but any non-matching string works. */
44  /* */
45  /* Some of this could arguably be implemented in fontconfig, however: */
46  /* */
47  /* - Fontconfig can't set things on a glyph-by-glyph basis. */
48  /* - The tweaks that happen here are very low-level, from an average */
49  /* user's point of view and are best implemented in the hinter. */
50  /* */
51  /* The goal is to make the subpixel hinting techniques as generalized */
52  /* as possible across all fonts to prevent the need for extra rules such */
53  /* as these. */
54  /* */
55  /* The rule structure is designed so that entirely new rules can easily */
56  /* be added when a new compatibility feature is discovered. */
57  /* */
58  /* The rule structures could also use some enhancement to handle ranges. */
59  /* */
60  /* ****************** WORK IN PROGRESS ******************* */
61  /* */
62 
63  /* These are `classes' of fonts that can be grouped together and used in */
64  /* rules below. A blank entry "" is required at the end of these! */
65 #define FAMILY_CLASS_RULES_SIZE 7
66 
67  static const SPH_Font_Class FAMILY_CLASS_Rules
68  [FAMILY_CLASS_RULES_SIZE] =
69  {
70  { "MS Legacy Fonts",
71  { "Aharoni",
72  "Andale Mono",
73  "Andalus",
74  "Angsana New",
75  "AngsanaUPC",
76  "Arabic Transparent",
77  "Arial Black",
78  "Arial Narrow",
79  "Arial Unicode MS",
80  "Arial",
81  "Batang",
82  "Browallia New",
83  "BrowalliaUPC",
84  "Comic Sans MS",
85  "Cordia New",
86  "CordiaUPC",
87  "Courier New",
88  "DFKai-SB",
89  "David Transparent",
90  "David",
91  "DilleniaUPC",
92  "Estrangelo Edessa",
93  "EucrosiaUPC",
94  "FangSong_GB2312",
95  "Fixed Miriam Transparent",
96  "FrankRuehl",
97  "Franklin Gothic Medium",
98  "FreesiaUPC",
99  "Garamond",
100  "Gautami",
101  "Georgia",
102  "Gulim",
103  "Impact",
104  "IrisUPC",
105  "JasmineUPC",
106  "KaiTi_GB2312",
107  "KodchiangUPC",
108  "Latha",
109  "Levenim MT",
110  "LilyUPC",
111  "Lucida Console",
112  "Lucida Sans Unicode",
113  "MS Gothic",
114  "MS Mincho",
115  "MV Boli",
116  "Mangal",
117  "Marlett",
118  "Microsoft Sans Serif",
119  "Mingliu",
120  "Miriam Fixed",
121  "Miriam Transparent",
122  "Miriam",
123  "Narkisim",
124  "Palatino Linotype",
125  "Raavi",
126  "Rod Transparent",
127  "Rod",
128  "Shruti",
129  "SimHei",
130  "Simplified Arabic Fixed",
131  "Simplified Arabic",
132  "Simsun",
133  "Sylfaen",
134  "Symbol",
135  "Tahoma",
136  "Times New Roman",
137  "Traditional Arabic",
138  "Trebuchet MS",
139  "Tunga",
140  "Verdana",
141  "Webdings",
142  "Wingdings",
143  "",
144  },
145  },
146  { "Core MS Legacy Fonts",
147  { "Arial Black",
148  "Arial Narrow",
149  "Arial Unicode MS",
150  "Arial",
151  "Comic Sans MS",
152  "Courier New",
153  "Garamond",
154  "Georgia",
155  "Impact",
156  "Lucida Console",
157  "Lucida Sans Unicode",
158  "Microsoft Sans Serif",
159  "Palatino Linotype",
160  "Tahoma",
161  "Times New Roman",
162  "Trebuchet MS",
163  "Verdana",
164  "",
165  },
166  },
167  { "Apple Legacy Fonts",
168  { "Geneva",
169  "Times",
170  "Monaco",
171  "Century",
172  "Chalkboard",
173  "Lobster",
174  "Century Gothic",
175  "Optima",
176  "Lucida Grande",
177  "Gill Sans",
178  "Baskerville",
179  "Helvetica",
180  "Helvetica Neue",
181  "",
182  },
183  },
184  { "Legacy Sans Fonts",
185  { "Andale Mono",
186  "Arial Unicode MS",
187  "Arial",
188  "Century Gothic",
189  "Comic Sans MS",
190  "Franklin Gothic Medium",
191  "Geneva",
192  "Lucida Console",
193  "Lucida Grande",
194  "Lucida Sans Unicode",
195  "Lucida Sans Typewriter",
196  "Microsoft Sans Serif",
197  "Monaco",
198  "Tahoma",
199  "Trebuchet MS",
200  "Verdana",
201  "",
202  },
203  },
204 
205  { "Misc Legacy Fonts",
206  { "Dark Courier", "", }, },
207  { "Verdana Clones",
208  { "DejaVu Sans",
209  "Bitstream Vera Sans", "", }, },
210  { "Verdana and Clones",
211  { "DejaVu Sans",
212  "Bitstream Vera Sans",
213  "Verdana", "", }, },
214  };
215 
216 
217  /* Define this to force natural (i.e. not bitmap-compatible) widths. */
218  /* The default leans strongly towards natural widths except for a few */
219  /* legacy fonts where a selective combination produces nicer results. */
220 /* #define FORCE_NATURAL_WIDTHS */
221 
222 
223  /* Define `classes' of styles that can be grouped together and used in */
224  /* rules below. A blank entry "" is required at the end of these! */
225 #define STYLE_CLASS_RULES_SIZE 5
226 
227  static const SPH_Font_Class STYLE_CLASS_Rules
228  [STYLE_CLASS_RULES_SIZE] =
229  {
230  { "Regular Class",
231  { "Regular",
232  "Book",
233  "Medium",
234  "Roman",
235  "Normal",
236  "",
237  },
238  },
239  { "Regular/Italic Class",
240  { "Regular",
241  "Book",
242  "Medium",
243  "Italic",
244  "Oblique",
245  "Roman",
246  "Normal",
247  "",
248  },
249  },
250  { "Bold/BoldItalic Class",
251  { "Bold",
252  "Bold Italic",
253  "Black",
254  "",
255  },
256  },
257  { "Bold/Italic/BoldItalic Class",
258  { "Bold",
259  "Bold Italic",
260  "Black",
261  "Italic",
262  "Oblique",
263  "",
264  },
265  },
266  { "Regular/Bold Class",
267  { "Regular",
268  "Book",
269  "Medium",
270  "Normal",
271  "Roman",
272  "Bold",
273  "Black",
274  "",
275  },
276  },
277  };
278 
279 
280  /* Force special legacy fixes for fonts. */
281 #define COMPATIBILITY_MODE_RULES_SIZE 1
282 
283  static const SPH_TweakRule COMPATIBILITY_MODE_Rules
284  [COMPATIBILITY_MODE_RULES_SIZE] =
285  {
286  { "Verdana Clones", 0, "", 0 },
287  };
288 
289 
290  /* Don't do subpixel (ignore_x_mode) hinting; do normal hinting. */
291 #define PIXEL_HINTING_RULES_SIZE 2
292 
293  static const SPH_TweakRule PIXEL_HINTING_Rules
294  [PIXEL_HINTING_RULES_SIZE] =
295  {
296  /* these characters are almost always safe */
297  { "Courier New", 12, "Italic", 'z' },
298  { "Courier New", 11, "Italic", 'z' },
299  };
300 
301 
302  /* Subpixel hinting ignores SHPIX rules on X. Force SHPIX for these. */
303 #define DO_SHPIX_RULES_SIZE 1
304 
305  static const SPH_TweakRule DO_SHPIX_Rules
306  [DO_SHPIX_RULES_SIZE] =
307  {
308  { "-", 0, "", 0 },
309  };
310 
311 
312  /* Skip Y moves that start with a point that is not on a Y pixel */
313  /* boundary and don't move that point to a Y pixel boundary. */
314 #define SKIP_NONPIXEL_Y_MOVES_RULES_SIZE 4
315 
316  static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules
317  [SKIP_NONPIXEL_Y_MOVES_RULES_SIZE] =
318  {
319  /* fix vwxyz thinness*/
320  { "Consolas", 0, "", 0 },
321  /* Fix thin middle stems */
322  { "Core MS Legacy Fonts", 0, "Regular", 0 },
323  /* Cyrillic small letter I */
324  { "Legacy Sans Fonts", 0, "", 0 },
325  /* Fix artifacts with some Regular & Bold */
326  { "Verdana Clones", 0, "", 0 },
327  };
328 
329 
330 #define SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1
331 
332  static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules_Exceptions
333  [SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
334  {
335  /* Fixes < and > */
336  { "Courier New", 0, "Regular", 0 },
337  };
338 
339 
340  /* Skip Y moves that start with a point that is not on a Y pixel */
341  /* boundary and don't move that point to a Y pixel boundary. */
342 #define SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE 2
343 
344  static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_DELTAP_Rules
345  [SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE] =
346  {
347  /* Maintain thickness of diagonal in 'N' */
348  { "Times New Roman", 0, "Regular/Bold Class", 'N' },
349  { "Georgia", 0, "Regular/Bold Class", 'N' },
350  };
351 
352 
353  /* Skip Y moves that move a point off a Y pixel boundary. */
354 #define SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE 1
355 
356  static const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules
357  [SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE] =
358  {
359  { "-", 0, "", 0 },
360  };
361 
362 
363 #define SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1
364 
365  static const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules_Exceptions
366  [SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
367  {
368  { "-", 0, "", 0 },
369  };
370 
371 
372  /* Round moves that don't move a point to a Y pixel boundary. */
373 #define ROUND_NONPIXEL_Y_MOVES_RULES_SIZE 2
374 
375  static const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules
376  [ROUND_NONPIXEL_Y_MOVES_RULES_SIZE] =
377  {
378  /* Droid font instructions don't snap Y to pixels */
379  { "Droid Sans", 0, "Regular/Italic Class", 0 },
380  { "Droid Sans Mono", 0, "", 0 },
381  };
382 
383 
384 #define ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1
385 
386  static const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules_Exceptions
387  [ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
388  {
389  { "-", 0, "", 0 },
390  };
391 
392 
393  /* Allow a Direct_Move along X freedom vector if matched. */
394 #define ALLOW_X_DMOVE_RULES_SIZE 1
395 
396  static const SPH_TweakRule ALLOW_X_DMOVE_Rules
397  [ALLOW_X_DMOVE_RULES_SIZE] =
398  {
399  /* Fixes vanishing diagonal in 4 */
400  { "Verdana", 0, "Regular", '4' },
401  };
402 
403 
404  /* Return MS rasterizer version 35 if matched. */
405 #define RASTERIZER_35_RULES_SIZE 8
406 
407  static const SPH_TweakRule RASTERIZER_35_Rules
408  [RASTERIZER_35_RULES_SIZE] =
409  {
410  /* This seems to be the only way to make these look good */
411  { "Times New Roman", 0, "Regular", 'i' },
412  { "Times New Roman", 0, "Regular", 'j' },
413  { "Times New Roman", 0, "Regular", 'm' },
414  { "Times New Roman", 0, "Regular", 'r' },
415  { "Times New Roman", 0, "Regular", 'a' },
416  { "Times New Roman", 0, "Regular", 'n' },
417  { "Times New Roman", 0, "Regular", 'p' },
418  { "Times", 0, "", 0 },
419  };
420 
421 
422  /* Don't round to the subpixel grid. Round to pixel grid. */
423 #define NORMAL_ROUND_RULES_SIZE 1
424 
425  static const SPH_TweakRule NORMAL_ROUND_Rules
426  [NORMAL_ROUND_RULES_SIZE] =
427  {
428  /* Fix serif thickness for certain ppems */
429  /* Can probably be generalized somehow */
430  { "Courier New", 0, "", 0 },
431  };
432 
433 
434  /* Skip IUP instructions if matched. */
435 #define SKIP_IUP_RULES_SIZE 1
436 
437  static const SPH_TweakRule SKIP_IUP_Rules
438  [SKIP_IUP_RULES_SIZE] =
439  {
440  { "Arial", 13, "Regular", 'a' },
441  };
442 
443 
444  /* Skip MIAP Twilight hack if matched. */
445 #define MIAP_HACK_RULES_SIZE 1
446 
447  static const SPH_TweakRule MIAP_HACK_Rules
448  [MIAP_HACK_RULES_SIZE] =
449  {
450  { "Geneva", 12, "", 0 },
451  };
452 
453 
454  /* Skip DELTAP instructions if matched. */
455 #define ALWAYS_SKIP_DELTAP_RULES_SIZE 23
456 
457  static const SPH_TweakRule ALWAYS_SKIP_DELTAP_Rules
458  [ALWAYS_SKIP_DELTAP_RULES_SIZE] =
459  {
460  { "Georgia", 0, "Regular", 'k' },
461  /* fix various problems with e in different versions */
462  { "Trebuchet MS", 14, "Regular", 'e' },
463  { "Trebuchet MS", 13, "Regular", 'e' },
464  { "Trebuchet MS", 15, "Regular", 'e' },
465  { "Trebuchet MS", 0, "Italic", 'v' },
466  { "Trebuchet MS", 0, "Italic", 'w' },
467  { "Trebuchet MS", 0, "Regular", 'Y' },
468  { "Arial", 11, "Regular", 's' },
469  /* prevent problems with '3' and others */
470  { "Verdana", 10, "Regular", 0 },
471  { "Verdana", 9, "Regular", 0 },
472  /* Cyrillic small letter short I */
473  { "Legacy Sans Fonts", 0, "", 0x438 },
474  { "Legacy Sans Fonts", 0, "", 0x439 },
475  { "Arial", 10, "Regular", '6' },
476  { "Arial", 0, "Bold/BoldItalic Class", 'a' },
477  /* Make horizontal stems consistent with the rest */
478  { "Arial", 24, "Bold", 'a' },
479  { "Arial", 25, "Bold", 'a' },
480  { "Arial", 24, "Bold", 's' },
481  { "Arial", 25, "Bold", 's' },
482  { "Arial", 34, "Bold", 's' },
483  { "Arial", 35, "Bold", 's' },
484  { "Arial", 36, "Bold", 's' },
485  { "Arial", 25, "Regular", 's' },
486  { "Arial", 26, "Regular", 's' },
487  };
488 
489 
490  /* Always do DELTAP instructions if matched. */
491 #define ALWAYS_DO_DELTAP_RULES_SIZE 1
492 
493  static const SPH_TweakRule ALWAYS_DO_DELTAP_Rules
494  [ALWAYS_DO_DELTAP_RULES_SIZE] =
495  {
496  { "-", 0, "", 0 },
497  };
498 
499 
500  /* Don't allow ALIGNRP after IUP. */
501 #define NO_ALIGNRP_AFTER_IUP_RULES_SIZE 1
502 
503  static const SPH_TweakRule NO_ALIGNRP_AFTER_IUP_Rules
504  [NO_ALIGNRP_AFTER_IUP_RULES_SIZE] =
505  {
506  /* Prevent creation of dents in outline */
507  { "-", 0, "", 0 },
508  };
509 
510 
511  /* Don't allow DELTAP after IUP. */
512 #define NO_DELTAP_AFTER_IUP_RULES_SIZE 1
513 
514  static const SPH_TweakRule NO_DELTAP_AFTER_IUP_Rules
515  [NO_DELTAP_AFTER_IUP_RULES_SIZE] =
516  {
517  { "-", 0, "", 0 },
518  };
519 
520 
521  /* Don't allow CALL after IUP. */
522 #define NO_CALL_AFTER_IUP_RULES_SIZE 1
523 
524  static const SPH_TweakRule NO_CALL_AFTER_IUP_Rules
525  [NO_CALL_AFTER_IUP_RULES_SIZE] =
526  {
527  /* Prevent creation of dents in outline */
528  { "-", 0, "", 0 },
529  };
530 
531 
532  /* De-embolden these glyphs slightly. */
533 #define DEEMBOLDEN_RULES_SIZE 9
534 
535  static const SPH_TweakRule DEEMBOLDEN_Rules
536  [DEEMBOLDEN_RULES_SIZE] =
537  {
538  { "Courier New", 0, "Bold", 'A' },
539  { "Courier New", 0, "Bold", 'W' },
540  { "Courier New", 0, "Bold", 'w' },
541  { "Courier New", 0, "Bold", 'M' },
542  { "Courier New", 0, "Bold", 'X' },
543  { "Courier New", 0, "Bold", 'K' },
544  { "Courier New", 0, "Bold", 'x' },
545  { "Courier New", 0, "Bold", 'z' },
546  { "Courier New", 0, "Bold", 'v' },
547  };
548 
549 
550  /* Embolden these glyphs slightly. */
551 #define EMBOLDEN_RULES_SIZE 2
552 
553  static const SPH_TweakRule EMBOLDEN_Rules
554  [EMBOLDEN_RULES_SIZE] =
555  {
556  { "Courier New", 0, "Regular", 0 },
557  { "Courier New", 0, "Italic", 0 },
558  };
559 
560 
561  /* This is a CVT hack that makes thick horizontal stems on 2, 5, 7 */
562  /* similar to Windows XP. */
563 #define TIMES_NEW_ROMAN_HACK_RULES_SIZE 12
564 
565  static const SPH_TweakRule TIMES_NEW_ROMAN_HACK_Rules
566  [TIMES_NEW_ROMAN_HACK_RULES_SIZE] =
567  {
568  { "Times New Roman", 16, "Italic", '2' },
569  { "Times New Roman", 16, "Italic", '5' },
570  { "Times New Roman", 16, "Italic", '7' },
571  { "Times New Roman", 16, "Regular", '2' },
572  { "Times New Roman", 16, "Regular", '5' },
573  { "Times New Roman", 16, "Regular", '7' },
574  { "Times New Roman", 17, "Italic", '2' },
575  { "Times New Roman", 17, "Italic", '5' },
576  { "Times New Roman", 17, "Italic", '7' },
577  { "Times New Roman", 17, "Regular", '2' },
578  { "Times New Roman", 17, "Regular", '5' },
579  { "Times New Roman", 17, "Regular", '7' },
580  };
581 
582 
583  /* This fudges distance on 2 to get rid of the vanishing stem issue. */
584  /* A real solution to this is certainly welcome. */
585 #define COURIER_NEW_2_HACK_RULES_SIZE 15
586 
587  static const SPH_TweakRule COURIER_NEW_2_HACK_Rules
588  [COURIER_NEW_2_HACK_RULES_SIZE] =
589  {
590  { "Courier New", 10, "Regular", '2' },
591  { "Courier New", 11, "Regular", '2' },
592  { "Courier New", 12, "Regular", '2' },
593  { "Courier New", 13, "Regular", '2' },
594  { "Courier New", 14, "Regular", '2' },
595  { "Courier New", 15, "Regular", '2' },
596  { "Courier New", 16, "Regular", '2' },
597  { "Courier New", 17, "Regular", '2' },
598  { "Courier New", 18, "Regular", '2' },
599  { "Courier New", 19, "Regular", '2' },
600  { "Courier New", 20, "Regular", '2' },
601  { "Courier New", 21, "Regular", '2' },
602  { "Courier New", 22, "Regular", '2' },
603  { "Courier New", 23, "Regular", '2' },
604  { "Courier New", 24, "Regular", '2' },
605  };
606 
607 
608 #ifndef FORCE_NATURAL_WIDTHS
609 
610  /* Use compatible widths with these glyphs. Compatible widths is always */
611  /* on when doing B/W TrueType instructing, but is used selectively here, */
612  /* typically on glyphs with 3 or more vertical stems. */
613 #define COMPATIBLE_WIDTHS_RULES_SIZE 38
614 
615  static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules
616  [COMPATIBLE_WIDTHS_RULES_SIZE] =
617  {
618  { "Arial Unicode MS", 12, "Regular Class", 'm' },
619  { "Arial Unicode MS", 14, "Regular Class", 'm' },
620  /* Cyrillic small letter sha */
621  { "Arial", 10, "Regular Class", 0x448 },
622  { "Arial", 11, "Regular Class", 'm' },
623  { "Arial", 12, "Regular Class", 'm' },
624  /* Cyrillic small letter sha */
625  { "Arial", 12, "Regular Class", 0x448 },
626  { "Arial", 13, "Regular Class", 0x448 },
627  { "Arial", 14, "Regular Class", 'm' },
628  /* Cyrillic small letter sha */
629  { "Arial", 14, "Regular Class", 0x448 },
630  { "Arial", 15, "Regular Class", 0x448 },
631  { "Arial", 17, "Regular Class", 'm' },
632  { "DejaVu Sans", 15, "Regular Class", 0 },
633  { "Microsoft Sans Serif", 11, "Regular Class", 0 },
634  { "Microsoft Sans Serif", 12, "Regular Class", 0 },
635  { "Segoe UI", 11, "Regular Class", 0 },
636  { "Monaco", 0, "Regular Class", 0 },
637  { "Segoe UI", 12, "Regular Class", 'm' },
638  { "Segoe UI", 14, "Regular Class", 'm' },
639  { "Tahoma", 11, "Regular Class", 0 },
640  { "Times New Roman", 16, "Regular Class", 'c' },
641  { "Times New Roman", 16, "Regular Class", 'm' },
642  { "Times New Roman", 16, "Regular Class", 'o' },
643  { "Times New Roman", 16, "Regular Class", 'w' },
644  { "Trebuchet MS", 11, "Regular Class", 0 },
645  { "Trebuchet MS", 12, "Regular Class", 0 },
646  { "Trebuchet MS", 14, "Regular Class", 0 },
647  { "Trebuchet MS", 15, "Regular Class", 0 },
648  { "Ubuntu", 12, "Regular Class", 'm' },
649  /* Cyrillic small letter sha */
650  { "Verdana", 10, "Regular Class", 0x448 },
651  { "Verdana", 11, "Regular Class", 0x448 },
652  { "Verdana and Clones", 12, "Regular Class", 'i' },
653  { "Verdana and Clones", 12, "Regular Class", 'j' },
654  { "Verdana and Clones", 12, "Regular Class", 'l' },
655  { "Verdana and Clones", 12, "Regular Class", 'm' },
656  { "Verdana and Clones", 13, "Regular Class", 'i' },
657  { "Verdana and Clones", 13, "Regular Class", 'j' },
658  { "Verdana and Clones", 13, "Regular Class", 'l' },
659  { "Verdana and Clones", 14, "Regular Class", 'm' },
660  };
661 
662 
663  /* Scaling slightly in the x-direction prior to hinting results in */
664  /* more visually pleasing glyphs in certain cases. */
665  /* This sometimes needs to be coordinated with compatible width rules. */
666  /* A value of 1000 corresponds to a scaled value of 1.0. */
667 
668 #define X_SCALING_RULES_SIZE 50
669 
670  static const SPH_ScaleRule X_SCALING_Rules[X_SCALING_RULES_SIZE] =
671  {
672  { "DejaVu Sans", 12, "Regular Class", 'm', 950 },
673  { "Verdana and Clones", 12, "Regular Class", 'a', 1100 },
674  { "Verdana and Clones", 13, "Regular Class", 'a', 1050 },
675  { "Arial", 11, "Regular Class", 'm', 975 },
676  { "Arial", 12, "Regular Class", 'm', 1050 },
677  /* Cyrillic small letter el */
678  { "Arial", 13, "Regular Class", 0x43B, 950 },
679  { "Arial", 13, "Regular Class", 'o', 950 },
680  { "Arial", 13, "Regular Class", 'e', 950 },
681  { "Arial", 14, "Regular Class", 'm', 950 },
682  /* Cyrillic small letter el */
683  { "Arial", 15, "Regular Class", 0x43B, 925 },
684  { "Bitstream Vera Sans", 10, "Regular/Italic Class", 0, 1100 },
685  { "Bitstream Vera Sans", 12, "Regular/Italic Class", 0, 1050 },
686  { "Bitstream Vera Sans", 16, "Regular Class", 0, 1050 },
687  { "Bitstream Vera Sans", 9, "Regular/Italic Class", 0, 1050 },
688  { "DejaVu Sans", 12, "Regular Class", 'l', 975 },
689  { "DejaVu Sans", 12, "Regular Class", 'i', 975 },
690  { "DejaVu Sans", 12, "Regular Class", 'j', 975 },
691  { "DejaVu Sans", 13, "Regular Class", 'l', 950 },
692  { "DejaVu Sans", 13, "Regular Class", 'i', 950 },
693  { "DejaVu Sans", 13, "Regular Class", 'j', 950 },
694  { "DejaVu Sans", 10, "Regular/Italic Class", 0, 1100 },
695  { "DejaVu Sans", 12, "Regular/Italic Class", 0, 1050 },
696  { "Georgia", 10, "", 0, 1050 },
697  { "Georgia", 11, "", 0, 1100 },
698  { "Georgia", 12, "", 0, 1025 },
699  { "Georgia", 13, "", 0, 1050 },
700  { "Georgia", 16, "", 0, 1050 },
701  { "Georgia", 17, "", 0, 1030 },
702  { "Liberation Sans", 12, "Regular Class", 'm', 1100 },
703  { "Lucida Grande", 11, "Regular Class", 'm', 1100 },
704  { "Microsoft Sans Serif", 11, "Regular Class", 'm', 950 },
705  { "Microsoft Sans Serif", 12, "Regular Class", 'm', 1050 },
706  { "Segoe UI", 12, "Regular Class", 'H', 1050 },
707  { "Segoe UI", 12, "Regular Class", 'm', 1050 },
708  { "Segoe UI", 14, "Regular Class", 'm', 1050 },
709  { "Tahoma", 11, "Regular Class", 'i', 975 },
710  { "Tahoma", 11, "Regular Class", 'l', 975 },
711  { "Tahoma", 11, "Regular Class", 'j', 900 },
712  { "Tahoma", 11, "Regular Class", 'm', 918 },
713  { "Verdana", 10, "Regular/Italic Class", 0, 1100 },
714  { "Verdana", 12, "Regular Class", 'm', 975 },
715  { "Verdana", 12, "Regular/Italic Class", 0, 1050 },
716  { "Verdana", 13, "Regular/Italic Class", 'i', 950 },
717  { "Verdana", 13, "Regular/Italic Class", 'j', 950 },
718  { "Verdana", 13, "Regular/Italic Class", 'l', 950 },
719  { "Verdana", 16, "Regular Class", 0, 1050 },
720  { "Verdana", 9, "Regular/Italic Class", 0, 1050 },
721  { "Times New Roman", 16, "Regular Class", 'm', 918 },
722  { "Trebuchet MS", 11, "Regular Class", 'm', 800 },
723  { "Trebuchet MS", 12, "Regular Class", 'm', 800 },
724  };
725 
726 #else
727 
728 #define COMPATIBLE_WIDTHS_RULES_SIZE 1
729 
730  static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules
731  [COMPATIBLE_WIDTHS_RULES_SIZE] =
732  {
733  { "-", 0, "", 0 },
734  };
735 
736 
737 #define X_SCALING_RULES_SIZE 1
738 
739  static const SPH_ScaleRule X_SCALING_Rules
740  [X_SCALING_RULES_SIZE] =
741  {
742  { "-", 0, "", 0, 1000 },
743  };
744 
745 #endif /* FORCE_NATURAL_WIDTHS */
746 
747 
748  static FT_Bool
749  is_member_of_family_class( const FT_String* detected_font_name,
750  const FT_String* rule_font_name )
751  {
752  FT_UInt i, j;
753 
754 
755  /* Does font name match rule family? */
756  if ( ft_strcmp( detected_font_name, rule_font_name ) == 0 )
757  return TRUE;
758 
759  /* Is font name a wildcard ""? */
760  if ( ft_strcmp( rule_font_name, "" ) == 0 )
761  return TRUE;
762 
763  /* Is font name contained in a class list? */
764  for ( i = 0; i < FAMILY_CLASS_RULES_SIZE; i++ )
765  {
766  if ( ft_strcmp( FAMILY_CLASS_Rules[i].name, rule_font_name ) == 0 )
767  {
768  for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ )
769  {
770  if ( ft_strcmp( FAMILY_CLASS_Rules[i].member[j], "" ) == 0 )
771  continue;
772  if ( ft_strcmp( FAMILY_CLASS_Rules[i].member[j],
773  detected_font_name ) == 0 )
774  return TRUE;
775  }
776  }
777  }
778 
779  return FALSE;
780  }
781 
782 
783  static FT_Bool
784  is_member_of_style_class( const FT_String* detected_font_style,
785  const FT_String* rule_font_style )
786  {
787  FT_UInt i, j;
788 
789 
790  /* Does font style match rule style? */
791  if ( ft_strcmp( detected_font_style, rule_font_style ) == 0 )
792  return TRUE;
793 
794  /* Is font style a wildcard ""? */
795  if ( ft_strcmp( rule_font_style, "" ) == 0 )
796  return TRUE;
797 
798  /* Is font style contained in a class list? */
799  for ( i = 0; i < STYLE_CLASS_RULES_SIZE; i++ )
800  {
801  if ( ft_strcmp( STYLE_CLASS_Rules[i].name, rule_font_style ) == 0 )
802  {
803  for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ )
804  {
805  if ( ft_strcmp( STYLE_CLASS_Rules[i].member[j], "" ) == 0 )
806  continue;
807  if ( ft_strcmp( STYLE_CLASS_Rules[i].member[j],
808  detected_font_style ) == 0 )
809  return TRUE;
810  }
811  }
812  }
813 
814  return FALSE;
815  }
816 
817 
819  sph_test_tweak( TT_Face face,
820  const FT_String* family,
821  FT_UInt ppem,
822  const FT_String* style,
823  FT_UInt glyph_index,
824  const SPH_TweakRule* rule,
825  FT_UInt num_rules )
826  {
827  FT_UInt i;
828 
829 
830  /* rule checks may be able to be optimized further */
831  for ( i = 0; i < num_rules; i++ )
832  {
833  if ( family &&
834  ( is_member_of_family_class ( family, rule[i].family ) ) )
835  if ( rule[i].ppem == 0 ||
836  rule[i].ppem == ppem )
837  if ( style &&
838  is_member_of_style_class ( style, rule[i].style ) )
839  if ( rule[i].glyph == 0 ||
841  rule[i].glyph ) == glyph_index )
842  return TRUE;
843  }
844 
845  return FALSE;
846  }
847 
848 
849  static FT_UInt
850  scale_test_tweak( TT_Face face,
851  const FT_String* family,
852  FT_UInt ppem,
853  const FT_String* style,
854  FT_UInt glyph_index,
855  const SPH_ScaleRule* rule,
856  FT_UInt num_rules )
857  {
858  FT_UInt i;
859 
860 
861  /* rule checks may be able to be optimized further */
862  for ( i = 0; i < num_rules; i++ )
863  {
864  if ( family &&
865  ( is_member_of_family_class ( family, rule[i].family ) ) )
866  if ( rule[i].ppem == 0 ||
867  rule[i].ppem == ppem )
868  if ( style &&
869  is_member_of_style_class( style, rule[i].style ) )
870  if ( rule[i].glyph == 0 ||
872  rule[i].glyph ) == glyph_index )
873  return rule[i].scale;
874  }
875 
876  return 1000;
877  }
878 
879 
881  sph_test_tweak_x_scaling( TT_Face face,
882  const FT_String* family,
883  FT_UInt ppem,
884  const FT_String* style,
885  FT_UInt glyph_index )
886  {
887  return scale_test_tweak( face, family, ppem, style, glyph_index,
888  X_SCALING_Rules, X_SCALING_RULES_SIZE );
889  }
890 
891 
892 #define TWEAK_RULES( x ) \
893  if ( sph_test_tweak( face, family, ppem, style, glyph_index, \
894  x##_Rules, x##_RULES_SIZE ) ) \
895  loader->exec->sph_tweak_flags |= SPH_TWEAK_##x;
896 
897 #define TWEAK_RULES_EXCEPTIONS( x ) \
898  if ( sph_test_tweak( face, family, ppem, style, glyph_index, \
899  x##_Rules_Exceptions, x##_RULES_EXCEPTIONS_SIZE ) ) \
900  loader->exec->sph_tweak_flags &= ~SPH_TWEAK_##x;
901 
902 
903  FT_LOCAL_DEF( void )
904  sph_set_tweaks( TT_Loader loader,
905  FT_UInt glyph_index )
906  {
907  TT_Face face = loader->face;
908  FT_String* family = face->root.family_name;
909  FT_UInt ppem = loader->size->metrics->x_ppem;
910  FT_String* style = face->root.style_name;
911 
912 
913  /* don't apply rules if style isn't set */
914  if ( !face->root.style_name )
915  return;
916 
917 #ifdef SPH_DEBUG_MORE_VERBOSE
918  printf( "%s,%d,%s,%c=%d ",
919  family, ppem, style, glyph_index, glyph_index );
920 #endif
921 
922  TWEAK_RULES( PIXEL_HINTING );
923 
924  if ( loader->exec->sph_tweak_flags & SPH_TWEAK_PIXEL_HINTING )
925  {
926  loader->exec->ignore_x_mode = FALSE;
927  return;
928  }
929 
930  TWEAK_RULES( ALLOW_X_DMOVE );
931  TWEAK_RULES( ALWAYS_DO_DELTAP );
932  TWEAK_RULES( ALWAYS_SKIP_DELTAP );
933  TWEAK_RULES( DEEMBOLDEN );
934  TWEAK_RULES( DO_SHPIX );
935  TWEAK_RULES( EMBOLDEN );
936  TWEAK_RULES( MIAP_HACK );
937  TWEAK_RULES( NORMAL_ROUND );
938  TWEAK_RULES( NO_ALIGNRP_AFTER_IUP );
939  TWEAK_RULES( NO_CALL_AFTER_IUP );
940  TWEAK_RULES( NO_DELTAP_AFTER_IUP );
941  TWEAK_RULES( RASTERIZER_35 );
942  TWEAK_RULES( SKIP_IUP );
943 
944  TWEAK_RULES( SKIP_OFFPIXEL_Y_MOVES );
945  TWEAK_RULES_EXCEPTIONS( SKIP_OFFPIXEL_Y_MOVES );
946 
947  TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES_DELTAP );
948 
949  TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES );
950  TWEAK_RULES_EXCEPTIONS( SKIP_NONPIXEL_Y_MOVES );
951 
952  TWEAK_RULES( ROUND_NONPIXEL_Y_MOVES );
953  TWEAK_RULES_EXCEPTIONS( ROUND_NONPIXEL_Y_MOVES );
954 
955  if ( loader->exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 )
956  {
957  if ( loader->exec->rasterizer_version != TT_INTERPRETER_VERSION_35 )
958  {
959  loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35;
960  loader->exec->size->cvt_ready = -1;
961 
962  tt_size_ready_bytecode(
963  loader->exec->size,
964  FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) );
965  }
966  else
967  loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35;
968  }
969  else
970  {
971  if ( loader->exec->rasterizer_version !=
972  SPH_OPTION_SET_RASTERIZER_VERSION )
973  {
974  loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;
975  loader->exec->size->cvt_ready = -1;
976 
977  tt_size_ready_bytecode(
978  loader->exec->size,
979  FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) );
980  }
981  else
982  loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;
983  }
984 
985  if ( IS_HINTED( loader->load_flags ) )
986  {
987  TWEAK_RULES( TIMES_NEW_ROMAN_HACK );
988  TWEAK_RULES( COURIER_NEW_2_HACK );
989  }
990 
991  if ( sph_test_tweak( face, family, ppem, style, glyph_index,
992  COMPATIBILITY_MODE_Rules, COMPATIBILITY_MODE_RULES_SIZE ) )
993  loader->exec->face->sph_compatibility_mode = TRUE;
994 
995 
996  if ( IS_HINTED( loader->load_flags ) )
997  {
998  if ( sph_test_tweak( face, family, ppem, style, glyph_index,
999  COMPATIBLE_WIDTHS_Rules, COMPATIBLE_WIDTHS_RULES_SIZE ) )
1000  loader->exec->compatible_widths |= TRUE;
1001  }
1002  }
1003 
1004 #else /* !(TT_USE_BYTECODE_INTERPRETER && */
1005  /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY) */
1006 
1007  /* ANSI C doesn't like empty source files */
1008  typedef int _tt_subpix_dummy;
1009 
1010 #endif /* !(TT_USE_BYTECODE_INTERPRETER && */
1011  /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY) */
1012 
1013 
1014 /* END */
#define TRUE
Definition: types.h:120
FT_UShort x_ppem
Definition: freetype.h:1640
#define FT_LOAD_PEDANTIC
Definition: freetype.h:3016
FT_BEGIN_HEADER typedef unsigned char FT_Bool
Definition: fttypes.h:108
int _tt_subpix_dummy
Definition: ttsubpix.c:1008
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
#define TT_INTERPRETER_VERSION_35
Definition: ftdriver.h:747
FT_String * family_name
Definition: freetype.h:1078
TT_Size size
Definition: tttypes.h:1638
TT_ExecContext exec
Definition: tttypes.h:1661
#define FT_LOCAL_DEF(x)
Definition: ftconfig.h:388
FT_Get_Char_Index(FT_Face face, FT_ULong charcode)
Definition: ftobjs.c:3668
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint GLint GLint j
Definition: glfuncs.h:250
char FT_String
Definition: fttypes.h:187
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Definition: ttobjs.h:281
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Definition: tttypes.h:1642
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Definition: fttypes.h:578
FT_FaceRec root
Definition: tttypes.h:1393
unsigned int FT_UInt
Definition: fttypes.h:231
TT_Face face
Definition: tttypes.h:1637
Definition: name.c:38
Arabic default style
Definition: afstyles.h:93
GLenum GLuint GLint GLenum face
Definition: glext.h:7025
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Definition: ftstdlib.h:86
#define printf
Definition: config.h:203
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Definition: ttobjs.h:417