2011-07-08 04:35:17 +02:00
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/*
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2012-08-12 00:34:13 +02:00
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* Copyright © 2010,2012 Google, Inc.
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2011-07-08 04:35:17 +02:00
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb-ot-shape-complex-private.hh"
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2012-04-10 16:52:07 +02:00
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/* TODO Add kana, and other small shapers here */
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2011-07-08 04:35:17 +02:00
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2012-07-17 02:26:57 +02:00
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2012-07-18 22:34:10 +02:00
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/* The default shaper *only* adds additional per-script features.*/
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2012-04-10 16:52:07 +02:00
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2012-04-12 04:00:46 +02:00
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static const hb_tag_t hangul_features[] =
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{
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HB_TAG('l','j','m','o'),
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HB_TAG('v','j','m','o'),
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HB_TAG('t','j','m','o'),
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2012-07-18 22:34:10 +02:00
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HB_TAG_NONE
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};
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static const hb_tag_t tibetan_features[] =
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{
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HB_TAG('a','b','v','s'),
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HB_TAG('b','l','w','s'),
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HB_TAG('a','b','v','m'),
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HB_TAG('b','l','w','m'),
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HB_TAG_NONE
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2012-04-12 04:00:46 +02:00
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};
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2012-07-31 03:08:51 +02:00
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static void
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2012-08-02 15:38:28 +02:00
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collect_features_default (hb_ot_shape_planner_t *plan)
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2012-04-07 21:06:55 +02:00
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{
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2012-07-18 22:34:10 +02:00
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const hb_tag_t *script_features = NULL;
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2012-08-02 15:38:28 +02:00
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switch ((hb_tag_t) plan->props.script)
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2012-07-18 22:34:10 +02:00
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{
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/* Unicode-1.1 additions */
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case HB_SCRIPT_HANGUL:
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script_features = hangul_features;
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break;
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/* Unicode-2.0 additions */
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case HB_SCRIPT_TIBETAN:
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script_features = tibetan_features;
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break;
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}
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for (; script_features && *script_features; script_features++)
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2012-08-02 15:38:28 +02:00
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plan->map.add_bool_feature (*script_features);
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2012-04-07 21:06:55 +02:00
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}
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2012-07-31 03:08:51 +02:00
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static hb_ot_shape_normalization_mode_t
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2012-11-13 21:35:35 +01:00
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normalization_preference_default (const hb_segment_properties_t *props)
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2012-04-07 21:06:55 +02:00
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{
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2012-11-13 21:35:35 +01:00
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switch ((hb_tag_t) props->script)
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2012-07-30 20:53:41 +02:00
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{
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/* Unicode-1.1 additions */
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case HB_SCRIPT_HANGUL:
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return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL;
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}
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2012-07-18 22:34:10 +02:00
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return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS;
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2012-04-07 21:06:55 +02:00
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}
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2012-11-13 21:35:35 +01:00
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static hb_bool_t
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compose_default (hb_unicode_funcs_t *unicode,
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hb_codepoint_t a,
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hb_codepoint_t b,
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hb_codepoint_t *ab)
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{
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/* Hebrew presentation-form shaping.
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* https://bugzilla.mozilla.org/show_bug.cgi?id=728866 */
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// Hebrew presentation forms with dagesh, for characters 0x05D0..0x05EA;
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// note that some letters do not have a dagesh presForm encoded
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static const hb_codepoint_t sDageshForms[0x05EA - 0x05D0 + 1] = {
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0xFB30, // ALEF
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0xFB31, // BET
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0xFB32, // GIMEL
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0xFB33, // DALET
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0xFB34, // HE
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0xFB35, // VAV
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0xFB36, // ZAYIN
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0, // HET
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0xFB38, // TET
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0xFB39, // YOD
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0xFB3A, // FINAL KAF
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0xFB3B, // KAF
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0xFB3C, // LAMED
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0, // FINAL MEM
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0xFB3E, // MEM
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0, // FINAL NUN
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0xFB40, // NUN
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0xFB41, // SAMEKH
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0, // AYIN
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0xFB43, // FINAL PE
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0xFB44, // PE
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0, // FINAL TSADI
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0xFB46, // TSADI
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0xFB47, // QOF
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0xFB48, // RESH
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0xFB49, // SHIN
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0xFB4A // TAV
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};
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hb_bool_t found = unicode->compose (a, b, ab);
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if (!found && (b & ~0x7F) == 0x0580) {
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// special-case Hebrew presentation forms that are excluded from
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// standard normalization, but wanted for old fonts
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switch (b) {
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case 0x05B4: // HIRIQ
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if (a == 0x05D9) { // YOD
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*ab = 0xFB1D;
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found = true;
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}
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break;
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case 0x05B7: // patah
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if (a == 0x05F2) { // YIDDISH YOD YOD
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*ab = 0xFB1F;
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found = true;
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} else if (a == 0x05D0) { // ALEF
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*ab = 0xFB2E;
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found = true;
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}
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break;
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case 0x05B8: // QAMATS
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if (a == 0x05D0) { // ALEF
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*ab = 0xFB2F;
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found = true;
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}
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break;
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case 0x05B9: // HOLAM
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if (a == 0x05D5) { // VAV
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*ab = 0xFB4B;
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found = true;
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}
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break;
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case 0x05BC: // DAGESH
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if (a >= 0x05D0 && a <= 0x05EA) {
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*ab = sDageshForms[a - 0x05D0];
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found = (*ab != 0);
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} else if (a == 0xFB2A) { // SHIN WITH SHIN DOT
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*ab = 0xFB2C;
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found = true;
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} else if (a == 0xFB2B) { // SHIN WITH SIN DOT
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*ab = 0xFB2D;
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found = true;
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}
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break;
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case 0x05BF: // RAFE
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switch (a) {
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case 0x05D1: // BET
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*ab = 0xFB4C;
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found = true;
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break;
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case 0x05DB: // KAF
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*ab = 0xFB4D;
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found = true;
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break;
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case 0x05E4: // PE
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*ab = 0xFB4E;
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found = true;
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break;
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}
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break;
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case 0x05C1: // SHIN DOT
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if (a == 0x05E9) { // SHIN
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*ab = 0xFB2A;
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found = true;
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} else if (a == 0xFB49) { // SHIN WITH DAGESH
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*ab = 0xFB2C;
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found = true;
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}
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break;
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case 0x05C2: // SIN DOT
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if (a == 0x05E9) { // SHIN
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*ab = 0xFB2B;
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found = true;
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} else if (a == 0xFB49) { // SHIN WITH DAGESH
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*ab = 0xFB2D;
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found = true;
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}
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break;
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}
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}
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return found;
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}
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2012-07-31 03:08:51 +02:00
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const hb_ot_complex_shaper_t _hb_ot_complex_shaper_default =
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2012-04-07 21:06:55 +02:00
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{
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2012-07-31 03:08:51 +02:00
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"default",
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collect_features_default,
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NULL, /* override_features */
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2012-08-02 16:46:34 +02:00
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NULL, /* data_create */
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NULL, /* data_destroy */
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2012-08-12 00:34:13 +02:00
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NULL, /* preprocess_text */
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2012-07-31 03:08:51 +02:00
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normalization_preference_default,
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2012-11-13 21:35:35 +01:00
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NULL, /* decompose */
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compose_default,
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2012-07-31 03:08:51 +02:00
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NULL, /* setup_masks */
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2012-08-01 05:41:06 +02:00
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true, /* zero_width_attached_marks */
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2012-11-14 22:48:26 +01:00
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true, /* fallback_position */
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2012-07-31 03:08:51 +02:00
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};
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2012-04-10 16:52:07 +02:00
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/* Thai / Lao shaper */
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2012-07-31 03:08:51 +02:00
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static void
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2012-08-12 00:34:13 +02:00
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preprocess_text_thai (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_buffer_t *buffer,
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hb_font_t *font HB_UNUSED)
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2012-04-10 16:52:07 +02:00
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{
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/* The following is NOT specified in the MS OT Thai spec, however, it seems
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* to be what Uniscribe and other engines implement. According to Eric Muller:
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*
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2012-07-23 19:15:33 +02:00
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* When you have a SARA AM, decompose it in NIKHAHIT + SARA AA, *and* move the
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* NIKHAHIT backwards over any tone mark (0E48-0E4B).
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2012-04-10 16:52:07 +02:00
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*
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* <0E14, 0E4B, 0E33> -> <0E14, 0E4D, 0E4B, 0E32>
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*
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2012-07-23 19:15:33 +02:00
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* This reordering is legit only when the NIKHAHIT comes from a SARA AM, not
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2012-04-10 16:52:07 +02:00
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* when it's there to start with. The string <0E14, 0E4B, 0E4D> is probably
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2012-07-23 19:15:33 +02:00
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* not what a user wanted, but the rendering is nevertheless nikhahit above
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2012-04-10 16:52:07 +02:00
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* chattawa.
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*
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* Same for Lao.
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2012-07-23 19:52:07 +02:00
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*
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* Note:
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*
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* Uniscribe also does so below-marks reordering. Namely, it positions U+0E3A
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* after U+0E38 and U+0E39. We do that by modifying the ccc for U+0E3A.
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2012-08-01 23:13:10 +02:00
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* See unicode->modified_combining_class (). Lao does NOT have a U+0E3A
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2012-07-23 19:52:07 +02:00
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* equivalent.
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2012-04-10 16:52:07 +02:00
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*/
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2012-07-23 19:15:33 +02:00
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2012-04-10 16:52:07 +02:00
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/*
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* Here are the characters of significance:
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*
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* Thai Lao
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* SARA AM: U+0E33 U+0EB3
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* SARA AA: U+0E32 U+0EB2
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* Nikhahit: U+0E4D U+0ECD
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*
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2012-07-23 19:15:33 +02:00
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* Testing shows that Uniscribe reorder the following marks:
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2012-07-23 20:04:42 +02:00
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* Thai: <0E31,0E34..0E37,0E47..0E4E>
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* Lao: <0EB1,0EB4..0EB7,0EC7..0ECE>
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2012-04-10 16:52:07 +02:00
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*
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* Note how the Lao versions are the same as Thai + 0x80.
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*/
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/* We only get one script at a time, so a script-agnostic implementation
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* is adequate here. */
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#define IS_SARA_AM(x) (((x) & ~0x0080) == 0x0E33)
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#define NIKHAHIT_FROM_SARA_AM(x) ((x) - 0xE33 + 0xE4D)
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#define SARA_AA_FROM_SARA_AM(x) ((x) - 1)
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2012-07-23 20:04:42 +02:00
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#define IS_TONE_MARK(x) (hb_in_ranges<hb_codepoint_t> ((x) & ~0x0080, 0x0E34, 0x0E37, 0x0E47, 0x0E4E, 0x0E31, 0x0E31))
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2012-04-10 16:52:07 +02:00
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buffer->clear_output ();
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unsigned int count = buffer->len;
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for (buffer->idx = 0; buffer->idx < count;)
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{
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2012-05-13 15:45:18 +02:00
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hb_codepoint_t u = buffer->cur().codepoint;
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2012-04-11 20:19:55 +02:00
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if (likely (!IS_SARA_AM (u))) {
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2012-04-10 16:52:07 +02:00
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buffer->next_glyph ();
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continue;
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}
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/* Is SARA AM. Decompose and reorder. */
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2012-04-24 04:18:54 +02:00
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hb_codepoint_t decomposed[2] = {hb_codepoint_t (NIKHAHIT_FROM_SARA_AM (u)),
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hb_codepoint_t (SARA_AA_FROM_SARA_AM (u))};
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2012-04-10 16:52:07 +02:00
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buffer->replace_glyphs (1, 2, decomposed);
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2012-04-10 23:20:05 +02:00
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if (unlikely (buffer->in_error))
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2012-04-10 16:52:07 +02:00
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return;
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/* Ok, let's see... */
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unsigned int end = buffer->out_len;
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unsigned int start = end - 2;
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while (start > 0 && IS_TONE_MARK (buffer->out_info[start - 1].codepoint))
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start--;
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2012-07-23 19:15:33 +02:00
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if (start + 2 < end)
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{
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/* Move Nikhahit (end-2) to the beginning */
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buffer->merge_out_clusters (start, end);
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hb_glyph_info_t t = buffer->out_info[end - 2];
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memmove (buffer->out_info + start + 1,
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buffer->out_info + start,
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sizeof (buffer->out_info[0]) * (end - start - 2));
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buffer->out_info[start] = t;
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}
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|
else
|
|
|
|
{
|
|
|
|
/* Since we decomposed, and NIKHAHIT is combining, merge clusters with the
|
|
|
|
* previous cluster. */
|
|
|
|
if (start)
|
|
|
|
buffer->merge_out_clusters (start - 1, end);
|
|
|
|
}
|
2012-04-10 16:52:07 +02:00
|
|
|
}
|
|
|
|
buffer->swap_buffers ();
|
|
|
|
}
|
2012-07-31 03:08:51 +02:00
|
|
|
|
|
|
|
const hb_ot_complex_shaper_t _hb_ot_complex_shaper_thai =
|
|
|
|
{
|
|
|
|
"thai",
|
|
|
|
NULL, /* collect_features */
|
|
|
|
NULL, /* override_features */
|
2012-08-02 16:46:34 +02:00
|
|
|
NULL, /* data_create */
|
|
|
|
NULL, /* data_destroy */
|
2012-08-12 00:34:13 +02:00
|
|
|
preprocess_text_thai,
|
2012-07-31 03:08:51 +02:00
|
|
|
NULL, /* normalization_preference */
|
2012-11-13 21:35:35 +01:00
|
|
|
NULL, /* decompose */
|
|
|
|
NULL, /* compose */
|
2012-08-12 00:34:13 +02:00
|
|
|
NULL, /* setup_masks */
|
2012-08-01 05:41:06 +02:00
|
|
|
true, /* zero_width_attached_marks */
|
2012-11-14 22:48:26 +01:00
|
|
|
false,/* fallback_position */
|
2012-07-31 03:08:51 +02:00
|
|
|
};
|