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[indic] Tweak for old-spec Bengali and halant-ya-halant 

Fixes https://github.com/harfbuzz/harfbuzz/issues/1073
This commit is contained in:
Behdad Esfahbod 2018-06-30 12:28:03 +04:30
parent 9541c9dae1
commit 8b9cbe3b24
1 changed files with 10 additions and 3 deletions
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13
src/hb-ot-shape-complex-indic.cc
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@ -668,8 +668,9 @@ initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
*
* Reports suggest that in some scripts Uniscribe does this only if there
* is *not* a Halant after last consonant already (eg. Kannada), while it
* does it unconditionally in other scripts (eg. Malayalam). We don't
* currently know about other scripts, so we single out Malayalam for now.
* does it unconditionally in other scripts (eg. Malayalam, Bengali). We
* don't currently know about other scripts, so we whitelist Malayalam and
* Bengali for now.
*
* Kannada test case:
* U+0C9A,U+0CCD,U+0C9A,U+0CCD
@ -679,10 +680,16 @@ initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
* Malayalam test case:
* U+0D38,U+0D4D,U+0D31,U+0D4D,U+0D31,U+0D4D
* With lohit-ttf-20121122/Lohit-Malayalam.ttf
*
* Bengali test case
* U+0998,U+09CD,U+09AF,U+09CD
* With Windows XP vrinda.ttf
* https://github.com/harfbuzz/harfbuzz/issues/1073
*/
if (indic_plan->is_old_spec)
{
bool disallow_double_halants = buffer->props.script != HB_SCRIPT_MALAYALAM;
bool disallow_double_halants = buffer->props.script != HB_SCRIPT_MALAYALAM &&
buffer->props.script != HB_SCRIPT_BENGALI;
for (unsigned int i = base + 1; i < end; i++)
if (info[i].indic_category() == OT_H)
{