diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-indic.cc')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-indic.cc | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-indic.cc b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-indic.cc index 8377dae979a..b8d9a3acf0a 100644 --- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-indic.cc +++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-indic.cc @@ -1127,6 +1127,24 @@ final_reordering_syllable (const hb_ot_shape_plan_t *plan, * defined as “after last standalone halant glyph, after initial matra * position and before the main consonant”. If ZWJ or ZWNJ follow this * halant, position is moved after it. + * + * IMPLEMENTATION NOTES: + * + * It looks like the last sentence is wrong. Testing, with Windows 7 Uniscribe + * and Devanagari shows that the behavior is best described as: + * + * "If ZWJ follows this halant, matra is NOT repositioned after this halant. + * If ZWNJ follows this halant, position is moved after it." + * + * Test case, with Adobe Devanagari or Nirmala UI: + * + * U+091F,U+094D,U+200C,U+092F,U+093F + * (Matra moves to the middle, after ZWNJ.) + * + * U+091F,U+094D,U+200D,U+092F,U+093F + * (Matra does NOT move, stays to the left.) + * + * https://github.com/harfbuzz/harfbuzz/issues/1070 */ if (start + 1 < end && start < base) /* Otherwise there can't be any pre-base matra characters. */ @@ -1140,6 +1158,7 @@ final_reordering_syllable (const hb_ot_shape_plan_t *plan, */ if (buffer->props.script != HB_SCRIPT_MALAYALAM && buffer->props.script != HB_SCRIPT_TAMIL) { + search: while (new_pos > start && !(is_one_of (info[new_pos], (FLAG (OT_M) | FLAG (OT_H))))) new_pos--; @@ -1150,9 +1169,27 @@ final_reordering_syllable (const hb_ot_shape_plan_t *plan, if (is_halant (info[new_pos]) && info[new_pos].indic_position() != POS_PRE_M) { +#if 0 // See comment above /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ if (new_pos + 1 < end && is_joiner (info[new_pos + 1])) new_pos++; +#endif + if (new_pos + 1 < end) + { + /* -> If ZWJ follows this halant, matra is NOT repositioned after this halant. */ + if (info[new_pos + 1].indic_category() == OT_ZWJ) + { + /* Keep searching. */ + if (new_pos > start) + { + new_pos--; + goto search; + } + } + /* -> If ZWNJ follows this halant, position is moved after it. */ + if (info[new_pos + 1].indic_category() == OT_ZWNJ) + new_pos++; + } } else new_pos = start; /* No move. */ |