diff options
Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-shape-complex-hebrew.cc')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-shape-complex-hebrew.cc | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-shape-complex-hebrew.cc b/gfx/harfbuzz/src/hb-ot-shape-complex-hebrew.cc new file mode 100644 index 000000000..96f249461 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-shape-complex-hebrew.cc @@ -0,0 +1,186 @@ +/* + * Copyright © 2010,2012 Google, Inc. + * + * This is part of HarfBuzz, a text shaping library. + * + * Permission is hereby granted, without written agreement and without + * license or royalty fees, to use, copy, modify, and distribute this + * software and its documentation for any purpose, provided that the + * above copyright notice and the following two paragraphs appear in + * all copies of this software. + * + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + * + * Google Author(s): Behdad Esfahbod + */ + +#include "hb-ot-shape-complex-private.hh" + + +static bool +compose_hebrew (const hb_ot_shape_normalize_context_t *c, + hb_codepoint_t a, + hb_codepoint_t b, + hb_codepoint_t *ab) +{ + /* Hebrew presentation-form shaping. + * https://bugzilla.mozilla.org/show_bug.cgi?id=728866 + * Hebrew presentation forms with dagesh, for characters U+05D0..05EA; + * Note that some letters do not have a dagesh presForm encoded. + */ + static const hb_codepoint_t sDageshForms[0x05EAu - 0x05D0u + 1] = { + 0xFB30u, /* ALEF */ + 0xFB31u, /* BET */ + 0xFB32u, /* GIMEL */ + 0xFB33u, /* DALET */ + 0xFB34u, /* HE */ + 0xFB35u, /* VAV */ + 0xFB36u, /* ZAYIN */ + 0x0000u, /* HET */ + 0xFB38u, /* TET */ + 0xFB39u, /* YOD */ + 0xFB3Au, /* FINAL KAF */ + 0xFB3Bu, /* KAF */ + 0xFB3Cu, /* LAMED */ + 0x0000u, /* FINAL MEM */ + 0xFB3Eu, /* MEM */ + 0x0000u, /* FINAL NUN */ + 0xFB40u, /* NUN */ + 0xFB41u, /* SAMEKH */ + 0x0000u, /* AYIN */ + 0xFB43u, /* FINAL PE */ + 0xFB44u, /* PE */ + 0x0000u, /* FINAL TSADI */ + 0xFB46u, /* TSADI */ + 0xFB47u, /* QOF */ + 0xFB48u, /* RESH */ + 0xFB49u, /* SHIN */ + 0xFB4Au /* TAV */ + }; + + bool found = (bool) c->unicode->compose (a, b, ab); + + if (!found && !c->plan->has_mark) + { + /* Special-case Hebrew presentation forms that are excluded from + * standard normalization, but wanted for old fonts. */ + switch (b) { + case 0x05B4u: /* HIRIQ */ + if (a == 0x05D9u) { /* YOD */ + *ab = 0xFB1Du; + found = true; + } + break; + case 0x05B7u: /* patah */ + if (a == 0x05F2u) { /* YIDDISH YOD YOD */ + *ab = 0xFB1Fu; + found = true; + } else if (a == 0x05D0u) { /* ALEF */ + *ab = 0xFB2Eu; + found = true; + } + break; + case 0x05B8u: /* QAMATS */ + if (a == 0x05D0u) { /* ALEF */ + *ab = 0xFB2Fu; + found = true; + } + break; + case 0x05B9u: /* HOLAM */ + if (a == 0x05D5u) { /* VAV */ + *ab = 0xFB4Bu; + found = true; + } + break; + case 0x05BCu: /* DAGESH */ + if (a >= 0x05D0u && a <= 0x05EAu) { + *ab = sDageshForms[a - 0x05D0u]; + found = (*ab != 0); + } else if (a == 0xFB2Au) { /* SHIN WITH SHIN DOT */ + *ab = 0xFB2Cu; + found = true; + } else if (a == 0xFB2Bu) { /* SHIN WITH SIN DOT */ + *ab = 0xFB2Du; + found = true; + } + break; + case 0x05BFu: /* RAFE */ + switch (a) { + case 0x05D1u: /* BET */ + *ab = 0xFB4Cu; + found = true; + break; + case 0x05DBu: /* KAF */ + *ab = 0xFB4Du; + found = true; + break; + case 0x05E4u: /* PE */ + *ab = 0xFB4Eu; + found = true; + break; + } + break; + case 0x05C1u: /* SHIN DOT */ + if (a == 0x05E9u) { /* SHIN */ + *ab = 0xFB2Au; + found = true; + } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */ + *ab = 0xFB2Cu; + found = true; + } + break; + case 0x05C2u: /* SIN DOT */ + if (a == 0x05E9u) { /* SHIN */ + *ab = 0xFB2Bu; + found = true; + } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */ + *ab = 0xFB2Du; + found = true; + } + break; + } + } + + return found; +} + +static bool +disable_otl_hebrew (const hb_ot_shape_plan_t *plan) +{ + /* For Hebrew shaper, use fallback if GPOS does not have 'hebr' + * script. This matches Uniscribe better, and makes fonts like + * Arial that have GSUB/GPOS/GDEF but no data for Hebrew work. + * See: + * https://github.com/behdad/harfbuzz/issues/347#issuecomment-267838368 + */ + return plan->map.chosen_script[1] != HB_TAG ('h','e','b','r'); +} + + +const hb_ot_complex_shaper_t _hb_ot_complex_shaper_hebrew = +{ + "hebrew", + NULL, /* collect_features */ + NULL, /* override_features */ + NULL, /* data_create */ + NULL, /* data_destroy */ + NULL, /* preprocess_text */ + NULL, /* postprocess_glyphs */ + HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT, + NULL, /* decompose */ + compose_hebrew, + NULL, /* setup_masks */ + disable_otl_hebrew, + HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE, + true, /* fallback_position */ +}; |