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[indic] If Malayalam dot-reph formed a ligature, don't move it 

Rachana-0.6 implements dot-reph by ligation, so we shouldn't move it.
Uniscribe doesn't either.  Test case:

  U+0D4E,U+0D1A,U+0D4D,U+0D1A,U+0D4D
This commit is contained in:
Behdad Esfahbod 2013-10-15 18:08:05 +02:00
parent a01cbf6cbe
commit 65a929b1c0
2 changed files with 20 additions and 6 deletions
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23
src/hb-ot-shape-complex-indic.cc
View File

@ -1320,12 +1320,23 @@ final_reordering_syllable (const hb_ot_shape_plan_t *plan,
* before post-base consonant forms, and after post-base consonant forms. * before post-base consonant forms, and after post-base consonant forms.
*/ */
/* If there's anything after the Ra that has the REPH pos, it ought to be halant. /* Two cases:
* Which means that the font has failed to ligate the Reph. In which case, we *
* shouldn't move. */ * - If repha is encoded as a sequence of characters (Ra,H or Ra,H,ZWJ), then
if (start + 1 < end && * we should only move it if the sequence ligated to the repha form.
info[start].indic_position() == POS_RA_TO_BECOME_REPH && *
info[start + 1].indic_position() != POS_RA_TO_BECOME_REPH) * - If repha is encoded separately and in the logical position, we should only
* move it if it did NOT ligate. If it ligated, it's probably the font trying
* to make it work without the reordering.
*/
if (start + 1 < end && (
(info[start].indic_category() != OT_Repha &&
info[start].indic_position() == POS_RA_TO_BECOME_REPH &&
info[start + 1].indic_position() != POS_RA_TO_BECOME_REPH)
||
(info[start].indic_category() == OT_Repha &&
!is_a_ligature (info[start]))
))
{ {
unsigned int new_reph_pos; unsigned int new_reph_pos;
reph_position_t reph_pos = indic_plan->config->reph_pos; reph_position_t reph_pos = indic_plan->config->reph_pos;

3
test/shaping/texts/in-tree/shaper-indic/indic/script-malayalam/misc/dot-reph.txt
View File

@ -10,3 +10,6 @@
ഗ്ഗോ ഗ്ഗോ
ഗ്ഗ ഗ്ഗ
ഗ്രോ ഗ്രോ
ൎകു
ൎക്കു
ൎച്ച്