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[Indic] For old-style Indic tables, move Halant around

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In old-style Indic OT standards, the post-base Halants are moved after
their base.  Emulate that by moving first post-base Halant to
post-last-consonant.

Brings test-shape-complex failures down from 88 to 54.  Getting there!
This commit is contained in:
Behdad Esfahbod 2011-07-30 21:08:10 -04:00
parent c47a31fb47
commit f5bc2725cb
2 changed files with 23 additions and 0 deletions
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3
src/hb-ot-map-private.hh
View File

@ -60,6 +60,9 @@ struct hb_ot_map_t
return map ? map->_1_mask : 0;
}
inline hb_tag_t get_chosen_script (unsigned int table_index) const
{ return chosen_script[table_index]; }
inline void substitute (hb_face_t *face, hb_buffer_t *buffer) const
{ apply (0, (hb_ot_map_t::apply_lookup_func_t) hb_ot_layout_substitute_lookup, face, buffer); }
inline void position (hb_font_t *font, hb_buffer_t *buffer) const

20
src/hb-ot-shape-complex-indic.cc
View File

@ -506,6 +506,26 @@ found_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t
info[start].mask = mask_array[RPHF];
}
/* For old-style Indic script tags, move the first post-base Halant after
* last consonant. */
if ((map->get_chosen_script (0) & 0x000000FF) != '2') {
/* We should only do this for Indic scripts which have a version two I guess. */
for (i = base + 1; i < end; i++)
if (info[i].indic_category() == OT_H) {
unsigned int j;
for (j = end - 1; j > i; j--)
if ((FLAG (info[j].indic_category()) & (FLAG (OT_C) | FLAG (OT_Ra))))
break;
if (j > i) {
/* Move Halant to after last consonant. */
hb_glyph_info_t t = info[i];
memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0]));
info[j] = t;
}
break;
}
}
/* Attach ZWJ, ZWNJ, nukta, and halant to previous char to move with them. */
for (i = start + 1; i < end; i++)
if ((FLAG (info[i].indic_category()) &