/* * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies) * * This is part of HarfBuzz, an OpenType Layout engine 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. */ #include "harfbuzz-shaper.h" #include "harfbuzz-shaper-private.h" #include #include /* // Vocabulary // Base -> A consonant or an independent vowel in its full (not subscript) form. It is the // center of the syllable, it can be surrounded by coeng (subscript) consonants, vowels, // split vowels, signs... but there is only one base in a syllable, it has to be coded as // the first character of the syllable. // split vowel --> vowel that has two parts placed separately (e.g. Before and after the consonant). // Khmer language has five of them. Khmer split vowels either have one part before the // base and one after the base or they have a part before the base and a part above the base. // The first part of all Khmer split vowels is the same character, identical to // the glyph of Khmer dependent vowel SRA EI // coeng --> modifier used in Khmer to construct coeng (subscript) consonants // Differently than indian languages, the coeng modifies the consonant that follows it, // not the one preceding it Each consonant has two forms, the base form and the subscript form // the base form is the normal one (using the consonants code-point), the subscript form is // displayed when the combination coeng + consonant is encountered. // Consonant of type 1 -> A consonant which has subscript for that only occupies space under a base consonant // Consonant of type 2.-> Its subscript form occupies space under and before the base (only one, RO) // Consonant of Type 3 -> Its subscript form occupies space under and after the base (KHO, CHHO, THHO, BA, YO, SA) // Consonant shifter -> Khmer has to series of consonants. The same dependent vowel has different sounds // if it is attached to a consonant of the first series or a consonant of the second series // Most consonants have an equivalent in the other series, but some of theme exist only in // one series (for example SA). If we want to use the consonant SA with a vowel sound that // can only be done with a vowel sound that corresponds to a vowel accompanying a consonant // of the other series, then we need to use a consonant shifter: TRIISAP or MUSIKATOAN // x17C9 y x17CA. TRIISAP changes a first series consonant to second series sound and // MUSIKATOAN a second series consonant to have a first series vowel sound. // Consonant shifter are both normally supercript marks, but, when they are followed by a // superscript, they change shape and take the form of subscript dependent vowel SRA U. // If they are in the same syllable as a coeng consonant, Unicode 3.0 says that they // should be typed before the coeng. Unicode 4.0 breaks the standard and says that it should // be placed after the coeng consonant. // Dependent vowel -> In khmer dependent vowels can be placed above, below, before or after the base // Each vowel has its own position. Only one vowel per syllable is allowed. // Signs -> Khmer has above signs and post signs. Only one above sign and/or one post sign are // Allowed in a syllable. // // // order is important here! This order must be the same that is found in each horizontal // line in the statetable for Khmer (see khmerStateTable) . */ enum KhmerCharClassValues { CC_RESERVED = 0, CC_CONSONANT = 1, /* Consonant of type 1 or independent vowel */ CC_CONSONANT2 = 2, /* Consonant of type 2 */ CC_CONSONANT3 = 3, /* Consonant of type 3 */ CC_ZERO_WIDTH_NJ_MARK = 4, /* Zero Width non joiner character (0x200C) */ CC_CONSONANT_SHIFTER = 5, CC_ROBAT = 6, /* Khmer special diacritic accent -treated differently in state table */ CC_COENG = 7, /* Subscript consonant combining character */ CC_DEPENDENT_VOWEL = 8, CC_SIGN_ABOVE = 9, CC_SIGN_AFTER = 10, CC_ZERO_WIDTH_J_MARK = 11, /* Zero width joiner character */ CC_COUNT = 12 /* This is the number of character classes */ }; enum KhmerCharClassFlags { CF_CLASS_MASK = 0x0000FFFF, CF_CONSONANT = 0x01000000, /* flag to speed up comparing */ CF_SPLIT_VOWEL = 0x02000000, /* flag for a split vowel -> the first part is added in front of the syllable */ CF_DOTTED_CIRCLE = 0x04000000, /* add a dotted circle if a character with this flag is the first in a syllable */ CF_COENG = 0x08000000, /* flag to speed up comparing */ CF_SHIFTER = 0x10000000, /* flag to speed up comparing */ CF_ABOVE_VOWEL = 0x20000000, /* flag to speed up comparing */ /* position flags */ CF_POS_BEFORE = 0x00080000, CF_POS_BELOW = 0x00040000, CF_POS_ABOVE = 0x00020000, CF_POS_AFTER = 0x00010000, CF_POS_MASK = 0x000f0000 }; /* Characters that get referred to by name */ enum KhmerChar { C_SIGN_ZWNJ = 0x200C, C_SIGN_ZWJ = 0x200D, C_RO = 0x179A, C_VOWEL_AA = 0x17B6, C_SIGN_NIKAHIT = 0x17C6, C_VOWEL_E = 0x17C1, C_COENG = 0x17D2 }; /* // simple classes, they are used in the statetable (in this file) to control the length of a syllable // they are also used to know where a character should be placed (location in reference to the base character) // and also to know if a character, when independently displayed, should be displayed with a dotted-circle to // indicate error in syllable construction */ enum { _xx = CC_RESERVED, _sa = CC_SIGN_ABOVE | CF_DOTTED_CIRCLE | CF_POS_ABOVE, _sp = CC_SIGN_AFTER | CF_DOTTED_CIRCLE| CF_POS_AFTER, _c1 = CC_CONSONANT | CF_CONSONANT, _c2 = CC_CONSONANT2 | CF_CONSONANT, _c3 = CC_CONSONANT3 | CF_CONSONANT, _rb = CC_ROBAT | CF_POS_ABOVE | CF_DOTTED_CIRCLE, _cs = CC_CONSONANT_SHIFTER | CF_DOTTED_CIRCLE | CF_SHIFTER, _dl = CC_DEPENDENT_VOWEL | CF_POS_BEFORE | CF_DOTTED_CIRCLE, _db = CC_DEPENDENT_VOWEL | CF_POS_BELOW | CF_DOTTED_CIRCLE, _da = CC_DEPENDENT_VOWEL | CF_POS_ABOVE | CF_DOTTED_CIRCLE | CF_ABOVE_VOWEL, _dr = CC_DEPENDENT_VOWEL | CF_POS_AFTER | CF_DOTTED_CIRCLE, _co = CC_COENG | CF_COENG | CF_DOTTED_CIRCLE, /* split vowel */ _va = _da | CF_SPLIT_VOWEL, _vr = _dr | CF_SPLIT_VOWEL }; /* // Character class: a character class value // ORed with character class flags. */ typedef unsigned long KhmerCharClass; /* // Character class tables // _xx character does not combine into syllable, such as numbers, puntuation marks, non-Khmer signs... // _sa Sign placed above the base // _sp Sign placed after the base // _c1 Consonant of type 1 or independent vowel (independent vowels behave as type 1 consonants) // _c2 Consonant of type 2 (only RO) // _c3 Consonant of type 3 // _rb Khmer sign robat u17CC. combining mark for subscript consonants // _cd Consonant-shifter // _dl Dependent vowel placed before the base (left of the base) // _db Dependent vowel placed below the base // _da Dependent vowel placed above the base // _dr Dependent vowel placed behind the base (right of the base) // _co Khmer combining mark COENG u17D2, combines with the consonant or independent vowel following // it to create a subscript consonant or independent vowel // _va Khmer split vowel in which the first part is before the base and the second one above the base // _vr Khmer split vowel in which the first part is before the base and the second one behind (right of) the base */ static const KhmerCharClass khmerCharClasses[] = { _c1, _c1, _c1, _c3, _c1, _c1, _c1, _c1, _c3, _c1, _c1, _c1, _c1, _c3, _c1, _c1, /* 1780 - 178F */ _c1, _c1, _c1, _c1, _c3, _c1, _c1, _c1, _c1, _c3, _c2, _c1, _c1, _c1, _c3, _c3, /* 1790 - 179F */ _c1, _c3, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, /* 17A0 - 17AF */ _c1, _c1, _c1, _c1, _dr, _dr, _dr, _da, _da, _da, _da, _db, _db, _db, _va, _vr, /* 17B0 - 17BF */ _vr, _dl, _dl, _dl, _vr, _vr, _sa, _sp, _sp, _cs, _cs, _sa, _rb, _sa, _sa, _sa, /* 17C0 - 17CF */ _sa, _sa, _co, _sa, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _sa, _xx, _xx /* 17D0 - 17DF */ }; /* this enum must reflect the range of khmerCharClasses */ enum KhmerCharClassesRange { KhmerFirstChar = 0x1780, KhmerLastChar = 0x17df }; /* // Below we define how a character in the input string is either in the khmerCharClasses table // (in which case we get its type back), a ZWJ or ZWNJ (two characters that may appear // within the syllable, but are not in the table) we also get their type back, or an unknown object // in which case we get _xx (CC_RESERVED) back */ static KhmerCharClass getKhmerCharClass(HB_UChar16 uc) { if (uc == C_SIGN_ZWJ) { return CC_ZERO_WIDTH_J_MARK; } if (uc == C_SIGN_ZWNJ) { return CC_ZERO_WIDTH_NJ_MARK; } if (uc < KhmerFirstChar || uc > KhmerLastChar) { return CC_RESERVED; } return khmerCharClasses[uc - KhmerFirstChar]; } /* // The stateTable is used to calculate the end (the length) of a well // formed Khmer Syllable. // // Each horizontal line is ordered exactly the same way as the values in KhmerClassTable // CharClassValues. This coincidence of values allows the follow up of the table. // // Each line corresponds to a state, which does not necessarily need to be a type // of component... for example, state 2 is a base, with is always a first character // in the syllable, but the state could be produced a consonant of any type when // it is the first character that is analysed (in ground state). // // Differentiating 3 types of consonants is necessary in order to // forbid the use of certain combinations, such as having a second // coeng after a coeng RO, // The inexistent possibility of having a type 3 after another type 3 is permitted, // eliminating it would very much complicate the table, and it does not create typing // problems, as the case above. // // The table is quite complex, in order to limit the number of coeng consonants // to 2 (by means of the table). // // There a peculiarity, as far as Unicode is concerned: // - The consonant-shifter is considered in two possible different // locations, the one considered in Unicode 3.0 and the one considered in // Unicode 4.0. (there is a backwards compatibility problem in this standard). // // // xx independent character, such as a number, punctuation sign or non-khmer char // // c1 Khmer consonant of type 1 or an independent vowel // that is, a letter in which the subscript for is only under the // base, not taking any space to the right or to the left // // c2 Khmer consonant of type 2, the coeng form takes space under // and to the left of the base (only RO is of this type) // // c3 Khmer consonant of type 3. Its subscript form takes space under // and to the right of the base. // // cs Khmer consonant shifter // // rb Khmer robat // // co coeng character (u17D2) // // dv dependent vowel (including split vowels, they are treated in the same way). // even if dv is not defined above, the component that is really tested for is // KhmerClassTable::CC_DEPENDENT_VOWEL, which is common to all dependent vowels // // zwj Zero Width joiner // // zwnj Zero width non joiner // // sa above sign // // sp post sign // // there are lines with equal content but for an easier understanding // (and maybe change in the future) we did not join them */ static const signed char khmerStateTable[][CC_COUNT] = { /* xx c1 c2 c3 zwnj cs rb co dv sa sp zwj */ { 1, 2, 2, 2, 1, 1, 1, 6, 1, 1, 1, 2}, /* 0 - ground state */ {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 1 - exit state (or sign to the right of the syllable) */ {-1, -1, -1, -1, 3, 4, 5, 6, 16, 17, 1, -1}, /* 2 - Base consonant */ {-1, -1, -1, -1, -1, 4, -1, -1, 16, -1, -1, -1}, /* 3 - First ZWNJ before a register shifter It can only be followed by a shifter or a vowel */ {-1, -1, -1, -1, 15, -1, -1, 6, 16, 17, 1, 14}, /* 4 - First register shifter */ {-1, -1, -1, -1, -1, -1, -1, -1, 20, -1, 1, -1}, /* 5 - Robat */ {-1, 7, 8, 9, -1, -1, -1, -1, -1, -1, -1, -1}, /* 6 - First Coeng */ {-1, -1, -1, -1, 12, 13, -1, 10, 16, 17, 1, 14}, /* 7 - First consonant of type 1 after coeng */ {-1, -1, -1, -1, 12, 13, -1, -1, 16, 17, 1, 14}, /* 8 - First consonant of type 2 after coeng */ {-1, -1, -1, -1, 12, 13, -1, 10, 16, 17, 1, 14}, /* 9 - First consonant or type 3 after ceong */ {-1, 11, 11, 11, -1, -1, -1, -1, -1, -1, -1, -1}, /* 10 - Second Coeng (no register shifter before) */ {-1, -1, -1, -1, 15, -1, -1, -1, 16, 17, 1, 14}, /* 11 - Second coeng consonant (or ind. vowel) no register shifter before */ {-1, -1, -1, -1, -1, 13, -1, -1, 16, -1, -1, -1}, /* 12 - Second ZWNJ before a register shifter */ {-1, -1, -1, -1, 15, -1, -1, -1, 16, 17, 1, 14}, /* 13 - Second register shifter */ {-1, -1, -1, -1, -1, -1, -1, -1, 16, -1, -1, -1}, /* 14 - ZWJ before vowel */ {-1, -1, -1, -1, -1, -1, -1, -1, 16, -1, -1, -1}, /* 15 - ZWNJ before vowel */ {-1, -1, -1, -1, -1, -1, -1, -1, -1, 17, 1, 18}, /* 16 - dependent vowel */ {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 18}, /* 17 - sign above */ {-1, -1, -1, -1, -1, -1, -1, 19, -1, -1, -1, -1}, /* 18 - ZWJ after vowel */ {-1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 19 - Third coeng */ {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1}, /* 20 - dependent vowel after a Robat */ }; /* #define KHMER_DEBUG */ #ifdef KHMER_DEBUG #define KHDEBUG qDebug #else #define KHDEBUG if(0) printf #endif /* // Given an input string of characters and a location in which to start looking // calculate, using the state table, which one is the last character of the syllable // that starts in the starting position. */ static int khmer_nextSyllableBoundary(const HB_UChar16 *s, int start, int end, HB_Bool *invalid) { const HB_UChar16 *uc = s + start; int state = 0; int pos = start; *invalid = FALSE; while (pos < end) { KhmerCharClass charClass = getKhmerCharClass(*uc); if (pos == start) { *invalid = (charClass > 0) && ! (charClass & CF_CONSONANT); } state = khmerStateTable[state][charClass & CF_CLASS_MASK]; KHDEBUG("state[%d]=%d class=%8lx (uc=%4x)", pos - start, state, charClass, *uc ); if (state < 0) { break; } ++uc; ++pos; } return pos; } #ifndef NO_OPENTYPE static const HB_OpenTypeFeature khmer_features[] = { { HB_MAKE_TAG( 'p', 'r', 'e', 'f' ), PreFormProperty }, { HB_MAKE_TAG( 'b', 'l', 'w', 'f' ), BelowFormProperty }, { HB_MAKE_TAG( 'a', 'b', 'v', 'f' ), AboveFormProperty }, { HB_MAKE_TAG( 'p', 's', 't', 'f' ), PostFormProperty }, { HB_MAKE_TAG( 'p', 'r', 'e', 's' ), PreSubstProperty }, { HB_MAKE_TAG( 'b', 'l', 'w', 's' ), BelowSubstProperty }, { HB_MAKE_TAG( 'a', 'b', 'v', 's' ), AboveSubstProperty }, { HB_MAKE_TAG( 'p', 's', 't', 's' ), PostSubstProperty }, { HB_MAKE_TAG( 'c', 'l', 'i', 'g' ), CligProperty }, { 0, 0 } }; #endif static HB_Bool khmer_shape_syllable(HB_Bool openType, HB_ShaperItem *item) { /* KHDEBUG("syllable from %d len %d, str='%s'", item->from, item->length, item->string->mid(item->from, item->length).toUtf8().data()); */ int len = 0; int syllableEnd = item->item.pos + item->item.length; unsigned short reordered[16]; unsigned char properties[16]; enum { AboveForm = 0x01, PreForm = 0x02, PostForm = 0x04, BelowForm = 0x08 }; #ifndef NO_OPENTYPE const int availableGlyphs = item->num_glyphs; #endif int coengRo; int i; /* according to the specs this is the max length one can get ### the real value should be smaller */ assert(item->item.length < 13); memset(properties, 0, 16*sizeof(unsigned char)); #ifdef KHMER_DEBUG qDebug("original:"); for (int i = from; i < syllableEnd; i++) { qDebug(" %d: %4x", i, string[i]); } #endif /* // write a pre vowel or the pre part of a split vowel first // and look out for coeng + ro. RO is the only vowel of type 2, and // therefore the only one that requires saving space before the base. */ coengRo = -1; /* There is no Coeng Ro, if found this value will change */ for (i = item->item.pos; i < syllableEnd; i += 1) { KhmerCharClass charClass = getKhmerCharClass(item->string[i]); /* if a split vowel, write the pre part. In Khmer the pre part is the same for all split vowels, same glyph as pre vowel C_VOWEL_E */ if (charClass & CF_SPLIT_VOWEL) { reordered[len] = C_VOWEL_E; properties[len] = PreForm; ++len; break; /* there can be only one vowel */ } /* if a vowel with pos before write it out */ if (charClass & CF_POS_BEFORE) { reordered[len] = item->string[i]; properties[len] = PreForm; ++len; break; /* there can be only one vowel */ } /* look for coeng + ro and remember position works because coeng + ro is always in front of a vowel (if there is a vowel) and because CC_CONSONANT2 is enough to identify it, as it is the only consonant with this flag */ if ( (charClass & CF_COENG) && (i + 1 < syllableEnd) && ( (getKhmerCharClass(item->string[i+1]) & CF_CLASS_MASK) == CC_CONSONANT2) ) { coengRo = i; } } /* write coeng + ro if found */ if (coengRo > -1) { reordered[len] = C_COENG; properties[len] = PreForm; ++len; reordered[len] = C_RO; properties[len] = PreForm; ++len; } /* shall we add a dotted circle? If in the position in which the base should be (first char in the string) there is a character that has the Dotted circle flag (a character that cannot be a base) then write a dotted circle */ if (getKhmerCharClass(item->string[item->item.pos]) & CF_DOTTED_CIRCLE) { reordered[len] = C_DOTTED_CIRCLE; ++len; } /* copy what is left to the output, skipping before vowels and coeng Ro if they are present */ for (i = item->item.pos; i < syllableEnd; i += 1) { HB_UChar16 uc = item->string[i]; KhmerCharClass charClass = getKhmerCharClass(uc); /* skip a before vowel, it was already processed */ if (charClass & CF_POS_BEFORE) { continue; } /* skip coeng + ro, it was already processed */ if (i == coengRo) { i += 1; continue; } switch (charClass & CF_POS_MASK) { case CF_POS_ABOVE : reordered[len] = uc; properties[len] = AboveForm; ++len; break; case CF_POS_AFTER : reordered[len] = uc; properties[len] = PostForm; ++len; break; case CF_POS_BELOW : reordered[len] = uc; properties[len] = BelowForm; ++len; break; default: /* assign the correct flags to a coeng consonant Consonants of type 3 are taged as Post forms and those type 1 as below forms */ if ( (charClass & CF_COENG) && i + 1 < syllableEnd ) { unsigned char property = (getKhmerCharClass(item->string[i+1]) & CF_CLASS_MASK) == CC_CONSONANT3 ? PostForm : BelowForm; reordered[len] = uc; properties[len] = property; ++len; i += 1; reordered[len] = item->string[i]; properties[len] = property; ++len; break; } /* if a shifter is followed by an above vowel change the shifter to below form, an above vowel can have two possible positions i + 1 or i + 3 (position i+1 corresponds to unicode 3, position i+3 to Unicode 4) and there is an extra rule for C_VOWEL_AA + C_SIGN_NIKAHIT also for two different positions, right after the shifter or after a vowel (Unicode 4) */ if ( (charClass & CF_SHIFTER) && (i + 1 < syllableEnd) ) { if (getKhmerCharClass(item->string[i+1]) & CF_ABOVE_VOWEL ) { reordered[len] = uc; properties[len] = BelowForm; ++len; break; } if (i + 2 < syllableEnd && (item->string[i+1] == C_VOWEL_AA) && (item->string[i+2] == C_SIGN_NIKAHIT) ) { reordered[len] = uc; properties[len] = BelowForm; ++len; break; } if (i + 3 < syllableEnd && (getKhmerCharClass(item->string[i+3]) & CF_ABOVE_VOWEL) ) { reordered[len] = uc; properties[len] = BelowForm; ++len; break; } if (i + 4 < syllableEnd && (item->string[i+3] == C_VOWEL_AA) && (item->string[i+4] == C_SIGN_NIKAHIT) ) { reordered[len] = uc; properties[len] = BelowForm; ++len; break; } } /* default - any other characters */ reordered[len] = uc; ++len; break; } /* switch */ } /* for */ if (!item->font->klass->convertStringToGlyphIndices(item->font, reordered, len, item->glyphs, &item->num_glyphs, item->item.bidiLevel % 2)) return FALSE; KHDEBUG("after shaping: len=%d", len); for (i = 0; i < len; i++) { item->attributes[i].mark = FALSE; item->attributes[i].clusterStart = FALSE; item->attributes[i].justification = 0; item->attributes[i].zeroWidth = FALSE; KHDEBUG(" %d: %4x property=%x", i, reordered[i], properties[i]); } /* now we have the syllable in the right order, and can start running it through open type. */ #ifndef NO_OPENTYPE if (openType) { hb_uint32 where[16]; for (i = 0; i < len; ++i) { where[i] = ~(PreSubstProperty | BelowSubstProperty | AboveSubstProperty | PostSubstProperty | CligProperty | PositioningProperties); if (properties[i] == PreForm) where[i] &= ~PreFormProperty; else if (properties[i] == BelowForm) where[i] &= ~BelowFormProperty; else if (properties[i] == AboveForm) where[i] &= ~AboveFormProperty; else if (properties[i] == PostForm) where[i] &= ~PostFormProperty; } HB_OpenTypeShape(item, where); if (!HB_OpenTypePosition(item, availableGlyphs, /*doLogClusters*/FALSE)) return FALSE; } else #endif { KHDEBUG("Not using openType"); HB_HeuristicPosition(item); } item->attributes[0].clusterStart = TRUE; return TRUE; } HB_Bool HB_KhmerShape(HB_ShaperItem *item) { HB_Bool openType = FALSE; unsigned short *logClusters = item->log_clusters; int i; HB_ShaperItem syllable = *item; int first_glyph = 0; int sstart = item->item.pos; int end = sstart + item->item.length; assert(item->item.script == HB_Script_Khmer); #ifndef NO_OPENTYPE openType = HB_SelectScript(item, khmer_features); #endif KHDEBUG("khmer_shape: from %d length %d", item->item.pos, item->item.length); while (sstart < end) { HB_Bool invalid; int send = khmer_nextSyllableBoundary(item->string, sstart, end, &invalid); KHDEBUG("syllable from %d, length %d, invalid=%s", sstart, send-sstart, invalid ? "TRUE" : "FALSE"); syllable.item.pos = sstart; syllable.item.length = send-sstart; syllable.glyphs = item->glyphs + first_glyph; syllable.attributes = item->attributes + first_glyph; syllable.offsets = item->offsets + first_glyph; syllable.advances = item->advances + first_glyph; syllable.num_glyphs = item->num_glyphs - first_glyph; if (!khmer_shape_syllable(openType, &syllable)) { KHDEBUG("syllable shaping failed, syllable requests %d glyphs", syllable.num_glyphs); item->num_glyphs += syllable.num_glyphs; return FALSE; } /* fix logcluster array */ KHDEBUG("syllable:"); for (i = first_glyph; i < first_glyph + (int)syllable.num_glyphs; ++i) KHDEBUG(" %d -> glyph %x", i, item->glyphs[i]); KHDEBUG(" logclusters:"); for (i = sstart; i < send; ++i) { KHDEBUG(" %d -> glyph %d", i, first_glyph); logClusters[i-item->item.pos] = first_glyph; } sstart = send; first_glyph += syllable.num_glyphs; } item->num_glyphs = first_glyph; return TRUE; } void HB_KhmerAttributes(HB_Script script, const HB_UChar16 *text, hb_uint32 from, hb_uint32 len, HB_CharAttributes *attributes) { int end = from + len; const HB_UChar16 *uc = text + from; hb_uint32 i = 0; HB_UNUSED(script); attributes += from; while ( i < len ) { HB_Bool invalid; hb_uint32 boundary = khmer_nextSyllableBoundary( text, from+i, end, &invalid ) - from; attributes[i].graphemeBoundary = TRUE; if ( boundary > len-1 ) boundary = len; i++; while ( i < boundary ) { attributes[i].graphemeBoundary = FALSE; ++uc; ++i; } assert( i == boundary ); } }