545 lines
15 KiB
C++
545 lines
15 KiB
C++
/*
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* Copyright © 2011,2012,2013 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb-ot-shape-complex-indic-private.hh"
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/* buffer var allocations */
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#define myanmar_category() complex_var_u8_0() /* myanmar_category_t */
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#define myanmar_position() complex_var_u8_1() /* myanmar_position_t */
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/*
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* Myanmar shaper.
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*/
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static const hb_tag_t
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basic_features[] =
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{
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/*
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* Basic features.
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* These features are applied in order, one at a time, after initial_reordering.
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*/
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HB_TAG('r','p','h','f'),
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HB_TAG('p','r','e','f'),
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HB_TAG('b','l','w','f'),
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HB_TAG('p','s','t','f'),
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};
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static const hb_tag_t
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other_features[] =
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{
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/*
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* Other features.
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* These features are applied all at once, after final_reordering.
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*/
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HB_TAG('p','r','e','s'),
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HB_TAG('a','b','v','s'),
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HB_TAG('b','l','w','s'),
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HB_TAG('p','s','t','s'),
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/* Positioning features, though we don't care about the types. */
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HB_TAG('d','i','s','t'),
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/* Pre-release version of Windows 8 Myanmar font had abvm,blwm
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* features. The released Windows 8 version of the font (as well
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* as the released spec) used 'mark' instead. The Windows 8
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* shaper however didn't apply 'mark' but did apply 'mkmk'.
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* Perhaps it applied abvm/blwm. This was fixed in a Windows 8
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* update, so now it applies mark/mkmk. We are guessing that
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* it still applies abvm/blwm too.
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*/
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HB_TAG('a','b','v','m'),
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HB_TAG('b','l','w','m'),
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};
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static void
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setup_syllables (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_buffer_t *buffer);
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static void
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initial_reordering (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_buffer_t *buffer);
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static void
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final_reordering (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_buffer_t *buffer);
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static void
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collect_features_myanmar (hb_ot_shape_planner_t *plan)
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{
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hb_ot_map_builder_t *map = &plan->map;
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/* Do this before any lookups have been applied. */
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map->add_gsub_pause (setup_syllables);
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map->add_global_bool_feature (HB_TAG('l','o','c','l'));
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/* The Indic specs do not require ccmp, but we apply it here since if
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* there is a use of it, it's typically at the beginning. */
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map->add_global_bool_feature (HB_TAG('c','c','m','p'));
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map->add_gsub_pause (initial_reordering);
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for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++)
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{
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map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
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map->add_gsub_pause (NULL);
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}
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map->add_gsub_pause (final_reordering);
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for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
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map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
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}
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static void
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override_features_myanmar (hb_ot_shape_planner_t *plan)
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{
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plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL);
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}
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enum syllable_type_t {
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consonant_syllable,
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broken_cluster,
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non_myanmar_cluster,
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};
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#include "hb-ot-shape-complex-myanmar-machine.hh"
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/* Note: This enum is duplicated in the -machine.rl source file.
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* Not sure how to avoid duplication. */
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enum myanmar_category_t {
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OT_As = 18, /* Asat */
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OT_D = 19, /* Digits except zero */
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OT_D0 = 20, /* Digit zero */
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OT_DB = OT_N, /* Dot below */
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OT_GB = OT_DOTTEDCIRCLE,
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OT_MH = 21, /* Various consonant medial types */
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OT_MR = 22, /* Various consonant medial types */
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OT_MW = 23, /* Various consonant medial types */
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OT_MY = 24, /* Various consonant medial types */
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OT_PT = 25, /* Pwo and other tones */
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OT_VAbv = 26,
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OT_VBlw = 27,
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OT_VPre = 28,
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OT_VPst = 29,
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OT_VS = 30 /* Variation selectors */
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};
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static inline bool
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is_one_of (const hb_glyph_info_t &info, unsigned int flags)
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{
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/* If it ligated, all bets are off. */
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if (_hb_glyph_info_ligated (&info)) return false;
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return !!(FLAG (info.myanmar_category()) & flags);
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}
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/* Note:
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*
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* We treat Vowels and placeholders as if they were consonants. This is safe because Vowels
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* cannot happen in a consonant syllable. The plus side however is, we can call the
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* consonant syllable logic from the vowel syllable function and get it all right! */
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#define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_CM) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_GB))
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static inline bool
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is_consonant (const hb_glyph_info_t &info)
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{
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return is_one_of (info, CONSONANT_FLAGS);
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}
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static inline void
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set_myanmar_properties (hb_glyph_info_t &info)
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{
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hb_codepoint_t u = info.codepoint;
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unsigned int type = hb_indic_get_categories (u);
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indic_category_t cat = (indic_category_t) (type & 0x7F);
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indic_position_t pos = (indic_position_t) (type >> 8);
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/* Myanmar
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* http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm#analyze
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*/
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if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xFE00, 0xFE0F)))
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cat = (indic_category_t) OT_VS;
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else if (unlikely (u == 0x200C)) cat = (indic_category_t) OT_ZWNJ;
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else if (unlikely (u == 0x200D)) cat = (indic_category_t) OT_ZWJ;
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switch (u)
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{
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case 0x002D: case 0x00A0: case 0x00D7: case 0x2012:
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case 0x2013: case 0x2014: case 0x2015: case 0x2022:
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case 0x25CC: case 0x25FB: case 0x25FC: case 0x25FD:
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case 0x25FE:
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cat = (indic_category_t) OT_GB;
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break;
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case 0x1004: case 0x101B: case 0x105A:
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cat = (indic_category_t) OT_Ra;
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break;
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case 0x1032: case 0x1036:
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cat = (indic_category_t) OT_A;
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break;
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case 0x103A:
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cat = (indic_category_t) OT_As;
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break;
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case 0x1041: case 0x1042: case 0x1043: case 0x1044:
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case 0x1045: case 0x1046: case 0x1047: case 0x1048:
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case 0x1049: case 0x1090: case 0x1091: case 0x1092:
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case 0x1093: case 0x1094: case 0x1095: case 0x1096:
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case 0x1097: case 0x1098: case 0x1099:
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cat = (indic_category_t) OT_D;
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break;
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case 0x1040:
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cat = (indic_category_t) OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */
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break;
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case 0x103E: case 0x1060:
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cat = (indic_category_t) OT_MH;
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break;
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case 0x103C:
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cat = (indic_category_t) OT_MR;
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break;
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case 0x103D: case 0x1082:
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cat = (indic_category_t) OT_MW;
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break;
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case 0x103B: case 0x105E: case 0x105F:
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cat = (indic_category_t) OT_MY;
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break;
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case 0x1063: case 0x1064: case 0x1069: case 0x106A:
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case 0x106B: case 0x106C: case 0x106D: case 0xAA7B:
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cat = (indic_category_t) OT_PT;
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break;
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case 0x1038: case 0x1087: case 0x1088: case 0x1089:
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case 0x108A: case 0x108B: case 0x108C: case 0x108D:
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case 0x108F: case 0x109A: case 0x109B: case 0x109C:
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cat = (indic_category_t) OT_SM;
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break;
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}
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if (cat == OT_M)
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{
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switch ((int) pos)
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{
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case POS_PRE_C: cat = (indic_category_t) OT_VPre;
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pos = POS_PRE_M; break;
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case POS_ABOVE_C: cat = (indic_category_t) OT_VAbv; break;
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case POS_BELOW_C: cat = (indic_category_t) OT_VBlw; break;
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case POS_POST_C: cat = (indic_category_t) OT_VPst; break;
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}
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}
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info.myanmar_category() = (myanmar_category_t) cat;
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info.myanmar_position() = pos;
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}
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static void
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setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_buffer_t *buffer,
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hb_font_t *font HB_UNUSED)
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{
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HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category);
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HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_position);
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/* We cannot setup masks here. We save information about characters
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* and setup masks later on in a pause-callback. */
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unsigned int count = buffer->len;
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for (unsigned int i = 0; i < count; i++)
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set_myanmar_properties (buffer->info[i]);
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}
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static void
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setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_font_t *font HB_UNUSED,
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hb_buffer_t *buffer)
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{
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find_syllables (buffer);
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}
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static int
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compare_myanmar_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb)
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{
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int a = pa->myanmar_position();
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int b = pb->myanmar_position();
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return a < b ? -1 : a == b ? 0 : +1;
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}
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/* Rules from:
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* http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm */
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static void
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initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
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hb_face_t *face,
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hb_buffer_t *buffer,
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unsigned int start, unsigned int end)
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{
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hb_glyph_info_t *info = buffer->info;
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unsigned int base = end;
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bool has_reph = false;
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{
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unsigned int limit = start;
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if (start + 3 <= end &&
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info[start ].myanmar_category() == OT_Ra &&
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info[start+1].myanmar_category() == OT_As &&
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info[start+2].myanmar_category() == OT_H)
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{
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limit += 3;
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base = start;
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has_reph = true;
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}
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{
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if (!has_reph)
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base = limit;
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for (unsigned int i = limit; i < end; i++)
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if (is_consonant (info[i]))
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{
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base = i;
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break;
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}
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}
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}
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/* Reorder! */
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{
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unsigned int i = start;
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for (; i < start + (has_reph ? 3 : 0); i++)
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info[i].myanmar_position() = POS_AFTER_MAIN;
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for (; i < base; i++)
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info[i].myanmar_position() = POS_PRE_C;
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if (i < end)
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{
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info[i].myanmar_position() = POS_BASE_C;
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i++;
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}
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indic_position_t pos = POS_AFTER_MAIN;
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/* The following loop may be ugly, but it implements all of
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* Myanmar reordering! */
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for (; i < end; i++)
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{
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if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */
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{
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info[i].myanmar_position() = POS_PRE_C;
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continue;
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}
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if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */
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{
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continue;
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}
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if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw)
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{
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pos = POS_BELOW_C;
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info[i].myanmar_position() = pos;
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continue;
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}
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if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A)
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{
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info[i].myanmar_position() = POS_BEFORE_SUB;
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continue;
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}
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if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw)
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{
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info[i].myanmar_position() = pos;
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continue;
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}
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if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A)
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{
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pos = POS_AFTER_SUB;
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info[i].myanmar_position() = pos;
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continue;
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}
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info[i].myanmar_position() = pos;
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}
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}
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buffer->merge_clusters (start, end);
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/* Sit tight, rock 'n roll! */
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hb_bubble_sort (info + start, end - start, compare_myanmar_order);
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}
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static void
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initial_reordering_broken_cluster (const hb_ot_shape_plan_t *plan,
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hb_face_t *face,
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hb_buffer_t *buffer,
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unsigned int start, unsigned int end)
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{
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/* We already inserted dotted-circles, so just call the consonant_syllable. */
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initial_reordering_consonant_syllable (plan, face, buffer, start, end);
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}
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static void
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initial_reordering_non_myanmar_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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hb_buffer_t *buffer HB_UNUSED,
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unsigned int start HB_UNUSED, unsigned int end HB_UNUSED)
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{
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/* Nothing to do right now. If we ever switch to using the output
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* buffer in the reordering process, we'd need to next_glyph() here. */
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}
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static void
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initial_reordering_syllable (const hb_ot_shape_plan_t *plan,
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hb_face_t *face,
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hb_buffer_t *buffer,
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unsigned int start, unsigned int end)
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{
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syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
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switch (syllable_type) {
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case consonant_syllable: initial_reordering_consonant_syllable (plan, face, buffer, start, end); return;
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case broken_cluster: initial_reordering_broken_cluster (plan, face, buffer, start, end); return;
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case non_myanmar_cluster: initial_reordering_non_myanmar_cluster (plan, face, buffer, start, end); return;
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}
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}
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static inline void
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insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_font_t *font,
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hb_buffer_t *buffer)
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{
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/* Note: This loop is extra overhead, but should not be measurable. */
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bool has_broken_syllables = false;
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unsigned int count = buffer->len;
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for (unsigned int i = 0; i < count; i++)
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if ((buffer->info[i].syllable() & 0x0F) == broken_cluster) {
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has_broken_syllables = true;
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break;
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}
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if (likely (!has_broken_syllables))
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return;
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hb_codepoint_t dottedcircle_glyph;
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if (!font->get_glyph (0x25CC, 0, &dottedcircle_glyph))
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return;
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hb_glyph_info_t dottedcircle = {0};
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dottedcircle.codepoint = 0x25CC;
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set_myanmar_properties (dottedcircle);
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dottedcircle.codepoint = dottedcircle_glyph;
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buffer->clear_output ();
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buffer->idx = 0;
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unsigned int last_syllable = 0;
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while (buffer->idx < buffer->len)
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{
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unsigned int syllable = buffer->cur().syllable();
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syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F);
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if (unlikely (last_syllable != syllable && syllable_type == broken_cluster))
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{
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last_syllable = syllable;
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hb_glyph_info_t info = dottedcircle;
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info.cluster = buffer->cur().cluster;
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info.mask = buffer->cur().mask;
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info.syllable() = buffer->cur().syllable();
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buffer->output_info (info);
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}
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else
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buffer->next_glyph ();
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}
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buffer->swap_buffers ();
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}
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static void
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initial_reordering (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_buffer_t *buffer)
|
|
{
|
|
insert_dotted_circles (plan, font, buffer);
|
|
|
|
hb_glyph_info_t *info = buffer->info;
|
|
unsigned int count = buffer->len;
|
|
if (unlikely (!count)) return;
|
|
unsigned int last = 0;
|
|
unsigned int last_syllable = info[0].syllable();
|
|
for (unsigned int i = 1; i < count; i++)
|
|
if (last_syllable != info[i].syllable()) {
|
|
initial_reordering_syllable (plan, font->face, buffer, last, i);
|
|
last = i;
|
|
last_syllable = info[last].syllable();
|
|
}
|
|
initial_reordering_syllable (plan, font->face, buffer, last, count);
|
|
}
|
|
|
|
static void
|
|
final_reordering (const hb_ot_shape_plan_t *plan,
|
|
hb_font_t *font HB_UNUSED,
|
|
hb_buffer_t *buffer)
|
|
{
|
|
hb_glyph_info_t *info = buffer->info;
|
|
unsigned int count = buffer->len;
|
|
|
|
/* Zero syllables now... */
|
|
for (unsigned int i = 0; i < count; i++)
|
|
info[i].syllable() = 0;
|
|
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category);
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position);
|
|
}
|
|
|
|
|
|
static hb_ot_shape_normalization_mode_t
|
|
normalization_preference_myanmar (const hb_segment_properties_t *props HB_UNUSED)
|
|
{
|
|
return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT;
|
|
}
|
|
|
|
|
|
const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
|
|
{
|
|
"myanmar",
|
|
collect_features_myanmar,
|
|
override_features_myanmar,
|
|
NULL, /* data_create */
|
|
NULL, /* data_destroy */
|
|
NULL, /* preprocess_text */
|
|
normalization_preference_myanmar,
|
|
NULL, /* decompose */
|
|
NULL, /* compose */
|
|
setup_masks_myanmar,
|
|
HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
|
|
false, /* fallback_position */
|
|
};
|