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[Indic] Add a separate Coeng class

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This commit is contained in:
Behdad Esfahbod 2012-07-17 11:37:32 -04:00
parent 74ccc6a132
commit deb521dee4
3 changed files with 19 additions and 11 deletions
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1
src/hb-ot-shape-complex-indic-machine.rl
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@ -53,6 +53,7 @@ A = 11;
NBSP = 12;
DOTTEDCIRCLE = 13;
RS = 14;
Coeng = 15;
c = C | Ra;
n = N N?;

3
src/hb-ot-shape-complex-indic-private.hh
View File

@ -59,7 +59,8 @@ enum indic_category_t {
OT_A,
OT_NBSP,
OT_DOTTEDCIRCLE, /* Not in the spec, but special in Uniscribe. /Very very/ special! */
OT_RS /* Register Shifter, used in Khmer OT spec */
OT_RS, /* Register Shifter (and other marks), used in Khmer OT spec */
OT_Coeng
};
/* Visual positions in a syllable from left to right. */

26
src/hb-ot-shape-complex-indic.cc
View File

@ -130,6 +130,12 @@ is_consonant (const hb_glyph_info_t &info)
return !!(FLAG (info.indic_category()) & (FLAG (OT_C) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_DOTTEDCIRCLE)));
}
static bool
is_halant_or_coeng (const hb_glyph_info_t &info)
{
return !!(FLAG (info.indic_category()) & (FLAG (OT_H) | FLAG (OT_Coeng)));
}
struct feature_list_t {
hb_tag_t tag;
hb_bool_t is_global;
@ -472,7 +478,7 @@ initial_reordering_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buff
{
unsigned int last_halant = end;
for (unsigned int i = base + 1; i < end; i++)
if (info[i].indic_category() == OT_H)
if (is_halant_or_coeng (info[i]))
last_halant = i;
else if (is_consonant (info[i])) {
for (unsigned int j = last_halant; j < i; j++)
@ -521,7 +527,7 @@ initial_reordering_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buff
{
/* Find a Halant,Ra sequence and mark it fore pre-base reordering processing. */
for (unsigned int i = base + 1; i + 1 < end; i++)
if (info[i].indic_category() == OT_H &&
if (is_halant_or_coeng (info[i]) &&
info[i + 1].indic_category() == OT_Ra)
{
info[i].mask |= basic_mask_array[PREF];
@ -644,11 +650,11 @@ final_reordering_syllable (hb_buffer_t *buffer,
{
unsigned int new_pos = base - 1;
while (new_pos > start &&
!(FLAG (info[new_pos].indic_category()) & (FLAG (OT_M) | FLAG (OT_H))))
!(FLAG (info[new_pos].indic_category()) & (FLAG (OT_M) | FLAG (OT_H) | FLAG (OT_Coeng))))
new_pos--;
/* If we found no Halant we are done. Otherwise only proceed if the Halant does
* not belong to the Matra itself! */
if (info[new_pos].indic_category() == OT_H &&
if (is_halant_or_coeng (info[new_pos]) &&
info[new_pos].indic_position() != POS_PRE_M) {
/* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */
if (new_pos + 1 < end && is_joiner (info[new_pos + 1]))
@ -745,10 +751,10 @@ final_reordering_syllable (hb_buffer_t *buffer,
*/
{
new_reph_pos = start + 1;
while (new_reph_pos < base && info[new_reph_pos].indic_category() != OT_H)
while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos]))
new_reph_pos++;
if (new_reph_pos < base && info[new_reph_pos].indic_category() == OT_H) {
if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) {
/* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */
if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1]))
new_reph_pos++;
@ -814,7 +820,7 @@ final_reordering_syllable (hb_buffer_t *buffer,
* TEST: U+0930,U+094D,U+0915,U+094B,U+094D
*/
if (!indic_options ().uniscribe_bug_compatible &&
unlikely (info[new_reph_pos].indic_category() == OT_H)) {
unlikely (is_halant_or_coeng (info[new_reph_pos]))) {
for (unsigned int i = base + 1; i < new_reph_pos; i++)
if (info[i].indic_category() == OT_M) {
/* Ok, got it. */
@ -862,10 +868,10 @@ final_reordering_syllable (hb_buffer_t *buffer,
unsigned int new_pos = base;
while (new_pos > start + 1 &&
!(FLAG (info[new_pos - 1].indic_category()) & (FLAG (OT_M) | FLAG (OT_H))))
!(FLAG (info[new_pos - 1].indic_category()) & (FLAG (OT_M) | FLAG (OT_H) | FLAG (OT_Coeng))))
new_pos--;
if (new_pos > start && info[new_pos - 1].indic_category() == OT_H)
if (new_pos > start && is_halant_or_coeng (info[new_pos - 1]))
/* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */
if (new_pos < end && is_joiner (info[new_pos]))
new_pos++;
@ -910,7 +916,7 @@ final_reordering_syllable (hb_buffer_t *buffer,
* Uniscribe does. */
unsigned int cluster_start = start;
for (unsigned int i = start + 1; i < start_of_last_cluster; i++)
if (info[i - 1].indic_category() == OT_H && info[i].indic_category() == OT_ZWNJ) {
if (is_halant_or_coeng (info[i - 1]) && info[i].indic_category() == OT_ZWNJ) {
i++;
buffer->merge_clusters (cluster_start, i);
cluster_start = i;