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[indic] Remove Consonant_Medial from grammar and code 

The only Indic CM is U+0A75 GURMUKHI SIGN YAKASH, which Uniscribe doesn't treat
specially, and font designers design for that.  So, do the same.
This commit is contained in:
Behdad Esfahbod 2018-10-01 20:05:00 +02:00
parent ab4c37f73a
commit 8bf4027d23
4 changed files with 590 additions and 674 deletions
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1246
src/hb-ot-shape-complex-indic-machine.hh
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File diff suppressed because it is too large Load Diff

10
src/hb-ot-shape-complex-indic-machine.rl
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@ -52,7 +52,6 @@ DOTTEDCIRCLE = 12;
RS = 13;
Repha = 15;
Ra = 16;
CM = 17;
Symbol= 18;
CS = 19;
@ -68,15 +67,14 @@ matra_group = z{0,3}.M.N?.(H | forced_rakar)?;
syllable_tail = (z?.SM.SM?.ZWNJ?)? A{0,3}?;
halant_group = (z?.H.(ZWJ.N?)?);
final_halant_group = halant_group | H.ZWNJ;
medial_group = CM?;
halant_or_matra_group = (final_halant_group | matra_group{0,4});
consonant_syllable = (Repha|CS)? (cn.halant_group){0,4} cn medial_group halant_or_matra_group syllable_tail;
vowel_syllable = reph? V.n? (ZWJ | (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail);
standalone_cluster = ((Repha|CS)? PLACEHOLDER | reph? DOTTEDCIRCLE).n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
consonant_syllable = (Repha|CS)? (cn.halant_group){0,4} cn halant_or_matra_group syllable_tail;
vowel_syllable = reph? V.n? (ZWJ | (halant_group.cn){0,4} halant_or_matra_group syllable_tail);
standalone_cluster = ((Repha|CS)? PLACEHOLDER | reph? DOTTEDCIRCLE).n? (halant_group.cn){0,4} halant_or_matra_group syllable_tail;
symbol_cluster = symbol syllable_tail;
broken_cluster = reph? n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
broken_cluster = reph? n? (halant_group.cn){0,4} halant_or_matra_group syllable_tail;
other = any;
main := |*

2
src/hb-ot-shape-complex-indic.cc
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@ -720,7 +720,7 @@ initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
indic_position_t last_pos = POS_START;
for (unsigned int i = start; i < end; i++)
{
if ((FLAG_UNSAFE (info[i].indic_category()) & (JOINER_FLAGS | FLAG (OT_N) | FLAG (OT_RS) | MEDIAL_FLAGS | FLAG (OT_H))))
if ((FLAG_UNSAFE (info[i].indic_category()) & (JOINER_FLAGS | FLAG (OT_N) | FLAG (OT_RS) | FLAG (OT_H))))
{
info[i].indic_position() = last_pos;
if (unlikely (info[i].indic_category() == OT_H &&

6
src/hb-ot-shape-complex-indic.hh
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@ -64,19 +64,17 @@ enum indic_category_t {
OT_Coeng = 14, /* Khmer-style Virama. */
OT_Repha = 15, /* Atomically-encoded logical or visual repha. */
OT_Ra = 16,
OT_CM = 17, /* Consonant-Medial. */
OT_CM = 17, /* Consonant-Medial; Unused by Indic shaper. */
OT_Symbol = 18, /* Avagraha, etc that take marks (SM,A,VD). */
OT_CS = 19
};
#define MEDIAL_FLAGS (FLAG (OT_CM))
/* Note:
*
* We treat Vowels and placeholders as if they were consonants. This is safe because Vowels
* cannot happen in a consonant syllable. The plus side however is, we can call the
* consonant syllable logic from the vowel syllable function and get it all right! */
#define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_CS) | FLAG (OT_Ra) | MEDIAL_FLAGS | FLAG (OT_V) | FLAG (OT_PLACEHOLDER) | FLAG (OT_DOTTEDCIRCLE))
#define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_CS) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_PLACEHOLDER) | FLAG (OT_DOTTEDCIRCLE))
#define JOINER_FLAGS (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ))