2 * Copyright © 2011,2012,2013 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
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7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 * Google Author(s): Behdad Esfahbod
27 #include "hb-ot-shape-complex-indic-private.hh"
29 /* buffer var allocations */
30 #define myanmar_category() complex_var_u8_0() /* myanmar_category_t */
31 #define myanmar_position() complex_var_u8_1() /* myanmar_position_t */
43 * These features are applied in order, one at a time, after initial_reordering.
45 HB_TAG('r','p','h','f'),
46 HB_TAG('p','r','e','f'),
47 HB_TAG('b','l','w','f'),
48 HB_TAG('p','s','t','f'),
55 * These features are applied all at once, after final_reordering.
57 HB_TAG('p','r','e','s'),
58 HB_TAG('a','b','v','s'),
59 HB_TAG('b','l','w','s'),
60 HB_TAG('p','s','t','s'),
61 /* Positioning features, though we don't care about the types. */
62 HB_TAG('d','i','s','t'),
63 /* Pre-release version of Windows 8 Myanmar font had abvm,blwm
64 * features. The released Windows 8 version of the font (as well
65 * as the released spec) used 'mark' instead. The Windows 8
66 * shaper however didn't apply 'mark' but did apply 'mkmk'.
67 * Perhaps it applied abvm/blwm. This was fixed in a Windows 8
68 * update, so now it applies mark/mkmk. We are guessing that
69 * it still applies abvm/blwm too.
71 HB_TAG('a','b','v','m'),
72 HB_TAG('b','l','w','m'),
76 setup_syllables (const hb_ot_shape_plan_t *plan,
80 initial_reordering (const hb_ot_shape_plan_t *plan,
84 final_reordering (const hb_ot_shape_plan_t *plan,
89 collect_features_myanmar (hb_ot_shape_planner_t *plan)
91 hb_ot_map_builder_t *map = &plan->map;
93 /* Do this before any lookups have been applied. */
94 map->add_gsub_pause (setup_syllables);
96 map->add_global_bool_feature (HB_TAG('l','o','c','l'));
97 /* The Indic specs do not require ccmp, but we apply it here since if
98 * there is a use of it, it's typically at the beginning. */
99 map->add_global_bool_feature (HB_TAG('c','c','m','p'));
102 map->add_gsub_pause (initial_reordering);
103 for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++)
105 map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
106 map->add_gsub_pause (NULL);
108 map->add_gsub_pause (final_reordering);
109 for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
110 map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
114 override_features_myanmar (hb_ot_shape_planner_t *plan)
116 plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL);
120 enum syllable_type_t {
127 #include "hb-ot-shape-complex-myanmar-machine.hh"
130 /* Note: This enum is duplicated in the -machine.rl source file.
131 * Not sure how to avoid duplication. */
132 enum myanmar_category_t {
133 OT_As = 18, /* Asat */
134 OT_D = 19, /* Digits except zero */
135 OT_D0 = 20, /* Digit zero */
136 OT_DB = OT_N, /* Dot below */
137 OT_GB = OT_PLACEHOLDER,
138 OT_MH = 21, /* Various consonant medial types */
139 OT_MR = 22, /* Various consonant medial types */
140 OT_MW = 23, /* Various consonant medial types */
141 OT_MY = 24, /* Various consonant medial types */
142 OT_PT = 25, /* Pwo and other tones */
147 OT_VS = 30, /* Variation selectors */
148 OT_P = 31 /* Punctuation */
153 is_one_of (const hb_glyph_info_t &info, unsigned int flags)
155 /* If it ligated, all bets are off. */
156 if (_hb_glyph_info_ligated (&info)) return false;
157 return !!(FLAG_SAFE (info.myanmar_category()) & flags);
161 is_consonant (const hb_glyph_info_t &info)
163 return is_one_of (info, CONSONANT_FLAGS);
168 set_myanmar_properties (hb_glyph_info_t &info)
170 hb_codepoint_t u = info.codepoint;
171 unsigned int type = hb_indic_get_categories (u);
172 indic_category_t cat = (indic_category_t) (type & 0x7Fu);
173 indic_position_t pos = (indic_position_t) (type >> 8);
176 * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm#analyze
178 if (unlikely (hb_in_range (u, 0xFE00u, 0xFE0Fu)))
179 cat = (indic_category_t) OT_VS;
184 cat = (indic_category_t) OT_C; /* The spec says C, IndicSyllableCategory doesn't have. */
187 case 0x002Du: case 0x00A0u: case 0x00D7u: case 0x2012u:
188 case 0x2013u: case 0x2014u: case 0x2015u: case 0x2022u:
189 case 0x25CCu: case 0x25FBu: case 0x25FCu: case 0x25FDu:
191 cat = (indic_category_t) OT_GB;
194 case 0x1004u: case 0x101Bu: case 0x105Au:
195 cat = (indic_category_t) OT_Ra;
198 case 0x1032u: case 0x1036u:
199 cat = (indic_category_t) OT_A;
203 cat = (indic_category_t) OT_H;
207 cat = (indic_category_t) OT_As;
210 case 0x1041u: case 0x1042u: case 0x1043u: case 0x1044u:
211 case 0x1045u: case 0x1046u: case 0x1047u: case 0x1048u:
212 case 0x1049u: case 0x1090u: case 0x1091u: case 0x1092u:
213 case 0x1093u: case 0x1094u: case 0x1095u: case 0x1096u:
214 case 0x1097u: case 0x1098u: case 0x1099u:
215 cat = (indic_category_t) OT_D;
219 cat = (indic_category_t) OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */
222 case 0x103Eu: case 0x1060u:
223 cat = (indic_category_t) OT_MH;
227 cat = (indic_category_t) OT_MR;
230 case 0x103Du: case 0x1082u:
231 cat = (indic_category_t) OT_MW;
234 case 0x103Bu: case 0x105Eu: case 0x105Fu:
235 cat = (indic_category_t) OT_MY;
238 case 0x1063u: case 0x1064u: case 0x1069u: case 0x106Au:
239 case 0x106Bu: case 0x106Cu: case 0x106Du: case 0xAA7Bu:
240 cat = (indic_category_t) OT_PT;
243 case 0x1038u: case 0x1087u: case 0x1088u: case 0x1089u:
244 case 0x108Au: case 0x108Bu: case 0x108Cu: case 0x108Du:
245 case 0x108Fu: case 0x109Au: case 0x109Bu: case 0x109Cu:
246 cat = (indic_category_t) OT_SM;
249 case 0x104Au: case 0x104Bu:
250 cat = (indic_category_t) OT_P;
258 case POS_PRE_C: cat = (indic_category_t) OT_VPre;
259 pos = POS_PRE_M; break;
260 case POS_ABOVE_C: cat = (indic_category_t) OT_VAbv; break;
261 case POS_BELOW_C: cat = (indic_category_t) OT_VBlw; break;
262 case POS_POST_C: cat = (indic_category_t) OT_VPst; break;
266 info.myanmar_category() = (myanmar_category_t) cat;
267 info.myanmar_position() = pos;
273 setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
275 hb_font_t *font HB_UNUSED)
277 HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category);
278 HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_position);
280 /* We cannot setup masks here. We save information about characters
281 * and setup masks later on in a pause-callback. */
283 unsigned int count = buffer->len;
284 hb_glyph_info_t *info = buffer->info;
285 for (unsigned int i = 0; i < count; i++)
286 set_myanmar_properties (info[i]);
290 setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED,
291 hb_font_t *font HB_UNUSED,
294 find_syllables (buffer);
298 compare_myanmar_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb)
300 int a = pa->myanmar_position();
301 int b = pb->myanmar_position();
303 return a < b ? -1 : a == b ? 0 : +1;
308 * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm */
311 initial_reordering_consonant_syllable (hb_buffer_t *buffer,
312 unsigned int start, unsigned int end)
314 hb_glyph_info_t *info = buffer->info;
316 unsigned int base = end;
317 bool has_reph = false;
320 unsigned int limit = start;
321 if (start + 3 <= end &&
322 info[start ].myanmar_category() == OT_Ra &&
323 info[start+1].myanmar_category() == OT_As &&
324 info[start+2].myanmar_category() == OT_H)
335 for (unsigned int i = limit; i < end; i++)
336 if (is_consonant (info[i]))
346 unsigned int i = start;
347 for (; i < start + (has_reph ? 3 : 0); i++)
348 info[i].myanmar_position() = POS_AFTER_MAIN;
349 for (; i < base; i++)
350 info[i].myanmar_position() = POS_PRE_C;
353 info[i].myanmar_position() = POS_BASE_C;
356 indic_position_t pos = POS_AFTER_MAIN;
357 /* The following loop may be ugly, but it implements all of
358 * Myanmar reordering! */
361 if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */
363 info[i].myanmar_position() = POS_PRE_C;
366 if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */
371 if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw)
374 info[i].myanmar_position() = pos;
378 if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A)
380 info[i].myanmar_position() = POS_BEFORE_SUB;
383 if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw)
385 info[i].myanmar_position() = pos;
388 if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A)
391 info[i].myanmar_position() = pos;
394 info[i].myanmar_position() = pos;
398 /* Sit tight, rock 'n roll! */
399 buffer->sort (start, end, compare_myanmar_order);
403 initial_reordering_syllable (const hb_ot_shape_plan_t *plan,
406 unsigned int start, unsigned int end)
408 syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
409 switch (syllable_type) {
411 case broken_cluster: /* We already inserted dotted-circles, so just call the consonant_syllable. */
412 case consonant_syllable:
413 initial_reordering_consonant_syllable (buffer, start, end);
416 case punctuation_cluster:
417 case non_myanmar_cluster:
423 insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
427 /* Note: This loop is extra overhead, but should not be measurable. */
428 bool has_broken_syllables = false;
429 unsigned int count = buffer->len;
430 hb_glyph_info_t *info = buffer->info;
431 for (unsigned int i = 0; i < count; i++)
432 if ((info[i].syllable() & 0x0F) == broken_cluster)
434 has_broken_syllables = true;
437 if (likely (!has_broken_syllables))
441 hb_codepoint_t dottedcircle_glyph;
442 if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph))
445 hb_glyph_info_t dottedcircle = {0};
446 dottedcircle.codepoint = 0x25CCu;
447 set_myanmar_properties (dottedcircle);
448 dottedcircle.codepoint = dottedcircle_glyph;
450 buffer->clear_output ();
453 unsigned int last_syllable = 0;
454 while (buffer->idx < buffer->len && !buffer->in_error)
456 unsigned int syllable = buffer->cur().syllable();
457 syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F);
458 if (unlikely (last_syllable != syllable && syllable_type == broken_cluster))
460 last_syllable = syllable;
462 hb_glyph_info_t ginfo = dottedcircle;
463 ginfo.cluster = buffer->cur().cluster;
464 ginfo.mask = buffer->cur().mask;
465 ginfo.syllable() = buffer->cur().syllable();
467 buffer->output_info (ginfo);
470 buffer->next_glyph ();
473 buffer->swap_buffers ();
477 initial_reordering (const hb_ot_shape_plan_t *plan,
481 insert_dotted_circles (plan, font, buffer);
483 foreach_syllable (buffer, start, end)
484 initial_reordering_syllable (plan, font->face, buffer, start, end);
488 final_reordering (const hb_ot_shape_plan_t *plan,
489 hb_font_t *font HB_UNUSED,
492 hb_glyph_info_t *info = buffer->info;
493 unsigned int count = buffer->len;
495 /* Zero syllables now... */
496 for (unsigned int i = 0; i < count; i++)
497 info[i].syllable() = 0;
499 HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category);
500 HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position);
504 /* Uniscribe seems to have a shaper for 'mymr' that is like the
505 * generic shaper, except that it zeros mark advances GDEF_LATE. */
506 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar_old =
509 NULL, /* collect_features */
510 NULL, /* override_features */
511 NULL, /* data_create */
512 NULL, /* data_destroy */
513 NULL, /* preprocess_text */
514 NULL, /* postprocess_glyphs */
515 HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
516 NULL, /* decompose */
518 NULL, /* setup_masks */
519 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
520 true, /* fallback_position */
523 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
526 collect_features_myanmar,
527 override_features_myanmar,
528 NULL, /* data_create */
529 NULL, /* data_destroy */
530 NULL, /* preprocess_text */
531 NULL, /* postprocess_glyphs */
532 HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
533 NULL, /* decompose */
536 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
537 false, /* fallback_position */