diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ucd.cc')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ucd.cc | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ucd.cc b/src/3rdparty/harfbuzz-ng/src/hb-ucd.cc index baea224a25..4c8b1ee5e6 100644 --- a/src/3rdparty/harfbuzz-ng/src/hb-ucd.cc +++ b/src/3rdparty/harfbuzz-ng/src/hb-ucd.cc @@ -129,12 +129,16 @@ hb_ucd_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED, hb_codepoint_t a, hb_codepoint_t b, hb_codepoint_t *ab, void *user_data HB_UNUSED) { + // Hangul is handled algorithmically. if (_hb_ucd_compose_hangul (a, b, ab)) return true; hb_codepoint_t u = 0; if ((a & 0xFFFFF800u) == 0x0000u && (b & 0xFFFFFF80) == 0x0300u) { + /* If "a" is small enough and "b" is in the U+0300 range, + * the composition data is encoded in a 32bit array sorted + * by "a,b" pair. */ uint32_t k = HB_CODEPOINT_ENCODE3_11_7_14 (a, b, 0); const uint32_t *v = hb_bsearch (k, _hb_ucd_dm2_u32_map, @@ -146,6 +150,8 @@ hb_ucd_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED, } else { + /* Otherwise it is stored in a 64bit array sorted by + * "a,b" pair. */ uint64_t k = HB_CODEPOINT_ENCODE3 (a, b, 0); const uint64_t *v = hb_bsearch (k, _hb_ucd_dm2_u64_map, @@ -170,15 +176,22 @@ hb_ucd_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED, unsigned i = _hb_ucd_dm (ab); + /* If no data, there's no decomposition. */ if (likely (!i)) return false; i--; + /* Check if it's a single-character decomposition. */ if (i < ARRAY_LENGTH (_hb_ucd_dm1_p0_map) + ARRAY_LENGTH (_hb_ucd_dm1_p2_map)) { + /* Single-character decompositions currently are only in plane 0 or plane 2. */ if (i < ARRAY_LENGTH (_hb_ucd_dm1_p0_map)) + { + /* Plane 0. */ *a = _hb_ucd_dm1_p0_map[i]; + } else { + /* Plane 2. */ i -= ARRAY_LENGTH (_hb_ucd_dm1_p0_map); *a = 0x20000 | _hb_ucd_dm1_p2_map[i]; } @@ -187,8 +200,10 @@ hb_ucd_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED, } i -= ARRAY_LENGTH (_hb_ucd_dm1_p0_map) + ARRAY_LENGTH (_hb_ucd_dm1_p2_map); + /* Otherwise they are encoded either in a 32bit array or a 64bit array. */ if (i < ARRAY_LENGTH (_hb_ucd_dm2_u32_map)) { + /* 32bit array. */ uint32_t v = _hb_ucd_dm2_u32_map[i]; *a = HB_CODEPOINT_DECODE3_11_7_14_1 (v); *b = HB_CODEPOINT_DECODE3_11_7_14_2 (v); @@ -196,6 +211,7 @@ hb_ucd_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED, } i -= ARRAY_LENGTH (_hb_ucd_dm2_u32_map); + /* 64bit array. */ uint64_t v = _hb_ucd_dm2_u64_map[i]; *a = HB_CODEPOINT_DECODE3_1 (v); *b = HB_CODEPOINT_DECODE3_2 (v); |