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Diffstat (limited to 'third_party/harfbuzz/src/harfbuzz-khmer.c')
| -rw-r--r-- | third_party/harfbuzz/src/harfbuzz-khmer.c | 667 |
1 files changed, 0 insertions, 667 deletions
diff --git a/third_party/harfbuzz/src/harfbuzz-khmer.c b/third_party/harfbuzz/src/harfbuzz-khmer.c deleted file mode 100644 index 958069e..0000000 --- a/third_party/harfbuzz/src/harfbuzz-khmer.c +++ /dev/null @@ -1,667 +0,0 @@ -/* - * 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 <assert.h> -#include <stdio.h> - -/* -// 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].charStop = TRUE; - - if ( boundary > len-1 ) boundary = len; - i++; - while ( i < boundary ) { - attributes[i].charStop = FALSE; - ++uc; - ++i; - } - assert( i == boundary ); - } -} - |