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[indic] Towards supporting atomicly-encoded prebase-reorderings

This commit is contained in:
Behdad Esfahbod 2013-10-17 19:07:53 +02:00
parent efed40b975
commit 74f4bbf056
1 changed files with 40 additions and 25 deletions
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65
src/hb-ot-shape-complex-indic.cc
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@ -273,12 +273,12 @@ enum base_position_t {
BASE_POS_LAST
};
enum reph_position_t {
REPH_POS_DONT_CARE = POS_RA_TO_BECOME_REPH,
REPH_POS_AFTER_MAIN = POS_AFTER_MAIN,
REPH_POS_BEFORE_SUB = POS_BEFORE_SUB,
REPH_POS_AFTER_SUB = POS_AFTER_SUB,
REPH_POS_BEFORE_POST = POS_BEFORE_POST,
REPH_POS_AFTER_POST = POS_AFTER_POST
REPH_POS_AFTER_POST = POS_AFTER_POST,
REPH_POS_DONT_CARE = POS_RA_TO_BECOME_REPH
};
enum reph_mode_t {
REPH_MODE_IMPLICIT, /* Reph formed out of initial Ra,H sequence. */
@ -290,6 +290,11 @@ enum blwf_mode_t {
BLWF_MODE_PRE_AND_POST, /* Below-forms feature applied to pre-base and post-base. */
BLWF_MODE_POST_ONLY /* Below-forms feature applied to post-base only. */
};
enum pref_len_t {
PREF_LEN_1 = 1,
PREF_LEN_2 = 2,
PREF_LEN_DONT_CARE = PREF_LEN_2
};
struct indic_config_t
{
hb_script_t script;
@ -299,25 +304,26 @@ struct indic_config_t
reph_position_t reph_pos;
reph_mode_t reph_mode;
blwf_mode_t blwf_mode;
pref_len_t pref_len;
};
static const indic_config_t indic_configs[] =
{
/* Default. Should be first. */
{HB_SCRIPT_INVALID, false, 0,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_DEVANAGARI,true, 0x094D,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_BENGALI, true, 0x09CD,BASE_POS_LAST, REPH_POS_AFTER_SUB, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_GURMUKHI, true, 0x0A4D,BASE_POS_LAST, REPH_POS_BEFORE_SUB, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_GUJARATI, true, 0x0ACD,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_ORIYA, true, 0x0B4D,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_TAMIL, true, 0x0BCD,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_TELUGU, true, 0x0C4D,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_EXPLICIT, BLWF_MODE_POST_ONLY},
{HB_SCRIPT_KANNADA, true, 0x0CCD,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT, BLWF_MODE_POST_ONLY},
{HB_SCRIPT_MALAYALAM, true, 0x0D4D,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_LOG_REPHA,BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_INVALID, false, 0,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_1},
{HB_SCRIPT_DEVANAGARI,true, 0x094D,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE},
{HB_SCRIPT_BENGALI, true, 0x09CD,BASE_POS_LAST, REPH_POS_AFTER_SUB, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE},
{HB_SCRIPT_GURMUKHI, true, 0x0A4D,BASE_POS_LAST, REPH_POS_BEFORE_SUB, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE},
{HB_SCRIPT_GUJARATI, true, 0x0ACD,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE},
{HB_SCRIPT_ORIYA, true, 0x0B4D,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE},
{HB_SCRIPT_TAMIL, true, 0x0BCD,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_2},
{HB_SCRIPT_TELUGU, true, 0x0C4D,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_EXPLICIT, BLWF_MODE_POST_ONLY, PREF_LEN_2},
{HB_SCRIPT_KANNADA, true, 0x0CCD,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT, BLWF_MODE_POST_ONLY, PREF_LEN_2},
{HB_SCRIPT_MALAYALAM, true, 0x0D4D,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_LOG_REPHA,BLWF_MODE_PRE_AND_POST, PREF_LEN_2},
{HB_SCRIPT_SINHALA, false,0x0DCA,BASE_POS_LAST_SINHALA,
REPH_POS_AFTER_MAIN, REPH_MODE_EXPLICIT, BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_KHMER, false,0x17D2,BASE_POS_FIRST,REPH_POS_DONT_CARE, REPH_MODE_VIS_REPHA,BLWF_MODE_PRE_AND_POST},
{HB_SCRIPT_JAVANESE, false,0xA9C0,BASE_POS_LAST, REPH_POS_DONT_CARE, REPH_MODE_VIS_REPHA,BLWF_MODE_PRE_AND_POST},
REPH_POS_AFTER_MAIN, REPH_MODE_EXPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE},
{HB_SCRIPT_KHMER, false,0x17D2,BASE_POS_FIRST,REPH_POS_DONT_CARE, REPH_MODE_VIS_REPHA,BLWF_MODE_PRE_AND_POST, PREF_LEN_2},
{HB_SCRIPT_JAVANESE, false,0xA9C0,BASE_POS_LAST, REPH_POS_DONT_CARE, REPH_MODE_VIS_REPHA,BLWF_MODE_PRE_AND_POST, PREF_LEN_1},
};
@ -588,8 +594,12 @@ consonant_position_from_face (const indic_shape_plan_t *indic_plan,
if (indic_plan->pstf.would_substitute (glyphs , 2, face) ||
indic_plan->pstf.would_substitute (glyphs+1, 2, face))
return POS_POST_C;
if (indic_plan->pref.would_substitute (glyphs , 2, face) ||
indic_plan->pref.would_substitute (glyphs+1, 2, face))
unsigned int pref_len = indic_plan->config->pref_len;
if ((pref_len == PREF_LEN_2 &&
(indic_plan->pref.would_substitute (glyphs , 2, face) ||
indic_plan->pref.would_substitute (glyphs+1, 2, face)))
|| (pref_len == PREF_LEN_1 &&
indic_plan->pref.would_substitute (glyphs+1, 1, face)))
return POS_POST_C;
return POS_BASE_C;
}
@ -1068,15 +1078,19 @@ initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
}
}
if (indic_plan->mask_array[PREF] && base + 2 < end)
unsigned int pref_len = indic_plan->config->pref_len;
if (indic_plan->mask_array[PREF] && base + pref_len < end)
{
assert (1 <= pref_len && pref_len <= 2);
/* Find a Halant,Ra sequence and mark it for pre-base reordering processing. */
for (unsigned int i = base + 1; i + 1 < end; i++) {
hb_codepoint_t glyphs[2] = {info[i].codepoint, info[i + 1].codepoint};
if (indic_plan->pref.would_substitute (glyphs, ARRAY_LENGTH (glyphs), face))
for (unsigned int i = base + 1; i + pref_len - 1 < end; i++) {
hb_codepoint_t glyphs[2];
for (unsigned int j = 0; j < pref_len; j++)
glyphs[j] = info[i + j].codepoint;
if (indic_plan->pref.would_substitute (glyphs, pref_len, face))
{
info[i++].mask |= indic_plan->mask_array[PREF];
info[i++].mask |= indic_plan->mask_array[PREF];
for (unsigned int j = 0; j < pref_len; j++)
info[i++].mask |= indic_plan->mask_array[PREF];
/* Mark the subsequent stuff with 'cfar'. Used in Khmer.
* Read the feature spec.
@ -1084,8 +1098,9 @@ initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
* U+1784,U+17D2,U+179A,U+17D2,U+1782
* U+1784,U+17D2,U+1782,U+17D2,U+179A
*/
for (; i < end; i++)
info[i].mask |= indic_plan->mask_array[CFAR];
if (indic_plan->mask_array[CFAR])
for (; i < end; i++)
info[i].mask |= indic_plan->mask_array[CFAR];
break;
}