diff options
Diffstat (limited to 'experimental/tqtinterface/qt4/include/private/qt4_harfbuzz/src/harfbuzz-tibetan.c')
-rw-r--r-- | experimental/tqtinterface/qt4/include/private/qt4_harfbuzz/src/harfbuzz-tibetan.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/experimental/tqtinterface/qt4/include/private/qt4_harfbuzz/src/harfbuzz-tibetan.c b/experimental/tqtinterface/qt4/include/private/qt4_harfbuzz/src/harfbuzz-tibetan.c new file mode 100644 index 000000000..bfa31b1de --- /dev/null +++ b/experimental/tqtinterface/qt4/include/private/qt4_harfbuzz/src/harfbuzz-tibetan.c @@ -0,0 +1,274 @@ +/* + * 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> + +/* + tibetan syllables are of the form: + head position consonant + first sub-joined consonant + ....intermediate sub-joined consonants (if any) + last sub-joined consonant + sub-joined vowel (a-chung U+0F71) + standard or compound vowel sign (or 'virama' for devanagari transliteration) +*/ + +typedef enum { + TibetanOther, + TibetanHeadConsonant, + TibetanSubjoinedConsonant, + TibetanSubjoinedVowel, + TibetanVowel +} TibetanForm; + +/* this table starts at U+0f40 */ +static const unsigned char tibetanForm[0x80] = { + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, + TibetanOther, TibetanOther, TibetanOther, TibetanOther, + + TibetanOther, TibetanVowel, TibetanVowel, TibetanVowel, + TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel, + TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel, + TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel, + + TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel, + TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel, + TibetanOther, TibetanOther, TibetanOther, TibetanOther, + TibetanOther, TibetanOther, TibetanOther, TibetanOther, + + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, + TibetanSubjoinedConsonant, TibetanOther, TibetanOther, TibetanOther +}; + + +#define tibetan_form(c) \ + (TibetanForm)tibetanForm[c - 0x0f40] + +static const HB_OpenTypeFeature tibetan_features[] = { + { HB_MAKE_TAG('c', 'c', 'm', 'p'), CcmpProperty }, + { HB_MAKE_TAG('a', 'b', 'v', 's'), AboveSubstProperty }, + { HB_MAKE_TAG('b', 'l', 'w', 's'), BelowSubstProperty }, + { HB_MAKE_TAG('c', 'a', 'l', 't'), CaltProperty }, + {0, 0} +}; + +static HB_Bool tibetan_shape_syllable(HB_Bool openType, HB_ShaperItem *item, HB_Bool invalid) +{ + hb_uint32 i; + const HB_UChar16 *str = item->string + item->item.pos; + int len = item->item.length; +#ifndef NO_OPENTYPE + const int availableGlyphs = item->num_glyphs; +#endif + HB_Bool haveGlyphs; + HB_STACKARRAY(HB_UChar16, reordered, len + 4); + + if (item->num_glyphs < item->item.length + 4) { + item->num_glyphs = item->item.length + 4; + return FALSE; + } + + if (invalid) { + *reordered = 0x25cc; + memcpy(reordered+1, str, len*sizeof(HB_UChar16)); + len++; + str = reordered; + } + + haveGlyphs = item->font->klass->convertStringToGlyphIndices(item->font, + str, len, + item->glyphs, &item->num_glyphs, + item->item.bidiLevel % 2); + + HB_FREE_STACKARRAY(reordered); + + if (!haveGlyphs) + return FALSE; + + for (i = 0; i < item->item.length; i++) { + item->attributes[i].mark = FALSE; + item->attributes[i].clusterStart = FALSE; + item->attributes[i].justification = 0; + item->attributes[i].zeroWidth = FALSE; +/* IDEBUG(" %d: %4x", i, str[i]); */ + } + + /* now we have the syllable in the right order, and can start running it through open type. */ + +#ifndef NO_OPENTYPE + if (openType) { + HB_OpenTypeShape(item, /*properties*/0); + if (!HB_OpenTypePosition(item, availableGlyphs, /*doLogClusters*/FALSE)) + return FALSE; + } else { + HB_HeuristicPosition(item); + } +#endif + + item->attributes[0].clusterStart = TRUE; + return TRUE; +} + + +static int tibetan_nextSyllableBoundary(const HB_UChar16 *s, int start, int end, HB_Bool *invalid) +{ + const HB_UChar16 *uc = s + start; + + int pos = 0; + TibetanForm state = tibetan_form(*uc); + +/* qDebug("state[%d]=%d (uc=%4x)", pos, state, uc[pos]);*/ + pos++; + + if (state != TibetanHeadConsonant) { + if (state != TibetanOther) + *invalid = TRUE; + goto finish; + } + + while (pos < end - start) { + TibetanForm newState = tibetan_form(uc[pos]); + switch(newState) { + case TibetanSubjoinedConsonant: + case TibetanSubjoinedVowel: + if (state != TibetanHeadConsonant && + state != TibetanSubjoinedConsonant) + goto finish; + state = newState; + break; + case TibetanVowel: + if (state != TibetanHeadConsonant && + state != TibetanSubjoinedConsonant && + state != TibetanSubjoinedVowel) + goto finish; + break; + case TibetanOther: + case TibetanHeadConsonant: + goto finish; + } + pos++; + } + +finish: + *invalid = FALSE; + return start+pos; +} + +HB_Bool HB_TibetanShape(HB_ShaperItem *item) +{ + + HB_Bool openType = FALSE; + unsigned short *logClusters = item->log_clusters; + + 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_Tibetan); + +#ifndef QT_NO_OPENTYPE + openType = HB_SelectScript(item, tibetan_features); +#endif + + while (sstart < end) { + HB_Bool invalid; + int i; + int send = tibetan_nextSyllableBoundary(item->string, sstart, end, &invalid); +/* IDEBUG("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 (!tibetan_shape_syllable(openType, &syllable, invalid)) { + item->num_glyphs += syllable.num_glyphs; + return FALSE; + } + /* fix logcluster array */ + for (i = sstart; i < send; ++i) + logClusters[i-item->item.pos] = first_glyph; + sstart = send; + first_glyph += syllable.num_glyphs; + } + item->num_glyphs = first_glyph; + return TRUE; +} + +void HB_TibetanAttributes(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 = tibetan_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); + } +} + + |