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[Indic] Disambiguate sub vs post vs above matras 

Bengali is at *just* above 5% now.
This commit is contained in:
Behdad Esfahbod 2012-05-11 21:42:27 +02:00
parent 9d0d319a4a
commit 6a091df9b4
2 changed files with 21 additions and 22 deletions
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31
src/hb-ot-shape-complex-indic-private.hh
View File

@ -64,16 +64,15 @@ enum indic_category_t {
/* Visual positions in a syllable from left to right. */
enum indic_position_t {
POS_RA_TO_BECOME_REPH,
POS_LEFT_MATRA,
POS_PRE_M,
POS_PRE_C,
POS_BASE_C,
POS_ABOVE_C,
POS_ABOVE_M,
POS_BELOW_C,
POS_BELOW_M,
POS_POST_C,
POS_MATRAS,
POS_POST_M,
POS_SMVD
};
@ -107,10 +106,10 @@ enum indic_syllabic_category_t {
enum indic_matra_category_t {
INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_BASE_C,
INDIC_MATRA_CATEGORY_LEFT = POS_LEFT_MATRA,
INDIC_MATRA_CATEGORY_TOP = POS_MATRAS,
INDIC_MATRA_CATEGORY_BOTTOM = POS_MATRAS,
INDIC_MATRA_CATEGORY_RIGHT = POS_MATRAS,
INDIC_MATRA_CATEGORY_LEFT = POS_PRE_M,
INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_M,
INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_M,
INDIC_MATRA_CATEGORY_RIGHT = POS_POST_M,
/* We don't really care much about these since we decompose them
* in the generic pre-shaping layer. They will only be used if
@ -121,13 +120,13 @@ enum indic_matra_category_t {
* TODO: There are some split matras without Unicode decompositions.
* We have to figure out what to do with them.
*/
INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = POS_MATRAS,
INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = POS_LEFT_MATRA,
INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = POS_MATRAS,
INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = POS_MATRAS,
INDIC_MATRA_CATEGORY_TOP_AND_LEFT = POS_LEFT_MATRA,
INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = POS_LEFT_MATRA,
INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = POS_MATRAS,
INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = POS_POST_M,
INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = POS_PRE_M,
INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = POS_BELOW_M,
INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = POS_POST_M,
INDIC_MATRA_CATEGORY_TOP_AND_LEFT = POS_PRE_M,
INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = POS_PRE_M,
INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = POS_POST_M,
INDIC_MATRA_CATEGORY_INVISIBLE = INDIC_MATRA_CATEGORY_NOT_APPLICABLE,
INDIC_MATRA_CATEGORY_OVERSTRUCK = INDIC_MATRA_CATEGORY_NOT_APPLICABLE,

12
src/hb-ot-shape-complex-indic.cc
View File

@ -410,9 +410,9 @@ initial_reordering_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mas
for (unsigned int i = start + 1; i < end; i++)
if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) {
info[i].indic_position() = info[i - 1].indic_position();
if (info[i].indic_category() == OT_H && info[i].indic_position() == POS_LEFT_MATRA)
if (info[i].indic_category() == OT_H && info[i].indic_position() == POS_PRE_M)
for (unsigned int j = i; j > start; j--)
if (info[j - 1].indic_position() != POS_LEFT_MATRA) {
if (info[j - 1].indic_position() != POS_PRE_M) {
info[i].indic_position() = info[j - 1].indic_position();
break;
}
@ -573,14 +573,14 @@ final_reordering_syllable (hb_buffer_t *buffer, hb_mask_t *mask_array,
/* If we found no Halant we are done. Otherwise only proceed if the Halant does
* not belong to the Matra itself! */
if (info[new_matra_pos].indic_category() == OT_H &&
info[new_matra_pos].indic_position() != POS_LEFT_MATRA) {
info[new_matra_pos].indic_position() != POS_PRE_M) {
/* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */
if (new_matra_pos + 1 < end && is_joiner (info[new_matra_pos + 1]))
new_matra_pos++;
/* Now go see if there's actually any matras... */
for (unsigned int i = new_matra_pos; i > start; i--)
if (info[i - 1].indic_position () == POS_LEFT_MATRA)
if (info[i - 1].indic_position () == POS_PRE_M)
{
unsigned int old_matra_pos = i - 1;
hb_glyph_info_t matra = info[old_matra_pos];
@ -703,7 +703,7 @@ final_reordering_syllable (hb_buffer_t *buffer, hb_mask_t *mask_array,
{
new_reph_pos = base;
while (new_reph_pos < end &&
!( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_MATRAS) | FLAG (POS_SMVD))))
!( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_POST_C) | FLAG (POS_POST_M) | FLAG (POS_SMVD))))
new_reph_pos++;
if (new_reph_pos < end)
goto reph_move;
@ -779,7 +779,7 @@ final_reordering_syllable (hb_buffer_t *buffer, hb_mask_t *mask_array,
/* Apply 'init' to the Left Matra if it's a word start. */
if (info[start].indic_position () == POS_LEFT_MATRA &&
if (info[start].indic_position () == POS_PRE_M &&
(!start ||
!(FLAG (_hb_glyph_info_get_general_category (&buffer->info[start - 1])) &
(FLAG (HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER) |