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[Indic] Start implementing pre-base reordering

This commit is contained in:
Behdad Esfahbod 2012-07-16 15:30:05 -04:00
parent 921ce5b17d
commit 46e645ec4b
1 changed files with 18 additions and 15 deletions
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33
src/hb-ot-shape-complex-indic.cc
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@ -181,11 +181,6 @@ indic_other_features[] =
{HB_TAG('b','l','w','m'), true},
};
/* Same order as the indic_other_features array */
enum {
INIT
};
static void
initial_reordering (const hb_ot_map_t *map,
@ -581,7 +576,8 @@ initial_reordering (const hb_ot_map_t *map,
}
static void
final_reordering_syllable (hb_buffer_t *buffer, hb_mask_t *other_mask_array,
final_reordering_syllable (hb_buffer_t *buffer,
hb_mask_t init_mask, hb_mask_t pref_mask,
unsigned int start, unsigned int end)
{
hb_glyph_info_t *info = buffer->info;
@ -825,8 +821,17 @@ final_reordering_syllable (hb_buffer_t *buffer, hb_mask_t *other_mask_array,
* consonant.
*/
/* TODO */
/* XXX */
if (pref_mask && base + 1 < end) /* Otherwise there can't be any pre-base reordering Ra. */
{
if ((info[base + 1].mask & pref_mask) != 0 &&
(base + 2 == end ||
(info[base + 2].mask & pref_mask) == 0))
{
/* Found a pre-base reordering Ra produced by substitution during application of the
* <pref> feature. */
}
}
/* Apply 'init' to the Left Matra if it's a word start. */
@ -841,7 +846,7 @@ final_reordering_syllable (hb_buffer_t *buffer, hb_mask_t *other_mask_array,
FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) |
FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) |
FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))))
info[start].mask |= other_mask_array[INIT];
info[start].mask |= init_mask;
@ -876,21 +881,19 @@ final_reordering (const hb_ot_map_t *map,
unsigned int count = buffer->len;
if (!count) return;
hb_mask_t other_mask_array[ARRAY_LENGTH (indic_other_features)] = {0};
unsigned int num_masks = ARRAY_LENGTH (indic_other_features);
for (unsigned int i = 0; i < num_masks; i++)
other_mask_array[i] = map->get_1_mask (indic_other_features[i].tag);
hb_mask_t init_mask = map->get_1_mask (HB_TAG('i','n','i','t'));
hb_mask_t pref_mask = map->get_1_mask (HB_TAG('p','r','e','f'));
hb_glyph_info_t *info = buffer->info;
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()) {
final_reordering_syllable (buffer, other_mask_array, last, i);
final_reordering_syllable (buffer, init_mask, pref_mask, last, i);
last = i;
last_syllable = info[last].syllable();
}
final_reordering_syllable (buffer, other_mask_array, last, count);
final_reordering_syllable (buffer, init_mask, pref_mask, last, count);
HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category);
HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position);