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[Indic] For scripts without Half forms, always choose first consonant as base

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In such scripts (ie. Khmer), a ZWJ/ZWNJ shouldn't stop the search for
base.  So, instead just choose the first consonant as base directly.

Test sequence:
U+1798,200c,U+17C9,U+17D2,U+179B,U+17C1,U+17C7
This commit is contained in:
Behdad Esfahbod 2012-07-17 14:23:28 -04:00
parent 34b5714906
commit 5d32690a34
1 changed files with 35 additions and 24 deletions
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59
src/hb-ot-shape-complex-indic.cc
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@ -352,35 +352,46 @@ initial_reordering_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buff
has_reph = true;
};
/* -> starting from the end of the syllable, move backwards */
unsigned int i = end;
do {
i--;
/* -> until a consonant is found */
if (is_consonant (info[i]))
{
/* -> that does not have a below-base or post-base form
* (post-base forms have to follow below-base forms), */
if (info[i].indic_position() != POS_BELOW_C &&
info[i].indic_position() != POS_POST_C)
if (basic_mask_array[HALF])
{
/* -> starting from the end of the syllable, move backwards */
unsigned int i = end;
do {
i--;
/* -> until a consonant is found */
if (is_consonant (info[i]))
{
/* -> that does not have a below-base or post-base form
* (post-base forms have to follow below-base forms), */
if (info[i].indic_position() != POS_BELOW_C &&
info[i].indic_position() != POS_POST_C)
{
base = i;
break;
}
/* -> or that is not a pre-base reordering Ra,
*
* TODO
*/
/* -> or arrive at the first consonant. The consonant stopped at will
* be the base. */
base = i;
break;
}
else
if (is_joiner (info[i]))
break;
} while (i > limit);
}
else
{
/* In scripts without half forms (eg. Khmer), the first consonant is always the base. */
/* -> or that is not a pre-base reordering Ra,
*
* TODO
*/
if (!has_reph)
base = limit;
}
/* -> or arrive at the first consonant. The consonant stopped at will
* be the base. */
base = i;
}
else
if (is_joiner (info[i]))
break;
} while (i > limit);
if (base < start)
base = start; /* Just in case... */