242 lines
8.5 KiB
C++
242 lines
8.5 KiB
C++
/*
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* @(#)ArabicShaping.cpp 1.10 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "OpenTypeTables.h"
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#include "ArabicShaping.h"
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enum {
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_c_ = ArabicShaping::ST_NOSHAPE_DUAL,
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_d_ = ArabicShaping::ST_DUAL,
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_n_ = ArabicShaping::ST_NONE,
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_r_ = ArabicShaping::ST_RIGHT,
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_t_ = ArabicShaping::ST_TRANSPARENT,
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_x_ = ArabicShaping::ST_NOSHAPE_NONE
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};
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const ArabicShaping::ShapeType ArabicShaping::shapeTypes[] =
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{
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_n_, _r_, _r_, _r_, _r_, _d_, _r_, _d_, _r_, _d_, _d_, _d_, _d_, _d_, _r_, _r_, // 0x621 - 0x630
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_r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _x_, _x_, _x_, _x_, _x_, _c_, // 0x631 - 0x640
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_d_, _d_, _d_, _d_, _d_, _d_, _d_, _r_, _d_, _d_, _t_, _t_, _t_, _t_, _t_, _t_, // 0x641 - 0x650
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_t_, _t_, _t_, _t_, _t_, _x_, _x_, _x_, _x_, _x_, _x_, _x_, _x_, _x_, _x_, _n_, // 0x651 - 0x660
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_n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _x_, _x_, _t_, // 0x661 - 0x670
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_r_, _r_, _r_, _x_, _r_, _r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x671 - 0x680
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_d_, _d_, _d_, _d_, _d_, _d_, _d_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, // 0x681 - 0x690
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_r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x691 - 0x6a0
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_d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x6a1 - 0x6b0
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_d_, _d_, _d_, _d_, _d_, _d_, _d_, _x_, _x_, _d_, _d_, _d_, _d_, _d_, _x_, _r_, // 0x6b1 - 0x6c0
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_d_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _d_, _r_, _d_, _x_, _d_, // 0x6c1 - 0x6d0
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_d_, _r_, _r_, _x_, _x_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, // 0x6d1 - 0x6e0
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_t_, _t_, _t_, _t_, _n_, _n_, _t_, _t_, _n_, _t_, _t_, _t_, _t_, _x_, _x_, _n_, // 0x6e1 - 0x6f0
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_n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _x_, _x_, _x_, _x_, _x_, _x_ // 0x6f1 - 0x6ff
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};
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/*
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shaping array holds types for arabic chars between 0621 and 0700
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other values are either unshaped, or transparent if a mark or format
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code, except for format codes 200c (zero-width non-joiner) and 200d
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(dual-width joiner) which are both unshaped and non_joining or
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dual-joining, respectively.
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*/
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ArabicShaping::ShapeType ArabicShaping::getShapeType(LEUnicode c)
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{
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if (c >= 0x0621 && c <= 0x206f) {
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if (c < 0x0700) {
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return shapeTypes[c - 0x0621];
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} else if (c == 0x200c) { // ZWNJ
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return ST_NOSHAPE_NONE;
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} else if (c == 0x200d) { // ZWJ
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return ST_NOSHAPE_DUAL;
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} else if (c >= 0x202a && c <= 0x202e) { // LRE - RLO
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return ST_TRANSPARENT;
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} else if (c >= 0x206a && c <= 0x206f) { // Inhibit Symmetric Swapping - Nominal Digit Shapes
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return ST_TRANSPARENT;
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}
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}
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return ST_NOSHAPE_NONE;
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}
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const LETag GlyphShaper::isolFeatureTag = 0x69736F6C; // 'isol'
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const LETag GlyphShaper::initFeatureTag = 0x696E6974; // 'init'
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const LETag GlyphShaper::mediFeatureTag = 0x6D656469; // 'medi'
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const LETag GlyphShaper::finaFeatureTag = 0x66696E61; // 'fina'
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const LETag GlyphShaper::ligaFeatureTag = 0x6C696761; // 'liga'
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const LETag GlyphShaper::msetFeatureTag = 0x6D736574; // 'mset'
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const LETag GlyphShaper::markFeatureTag = 0x6D61726B; // 'mark'
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const LETag GlyphShaper::emptyTag = 0x00000000; // ''
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const LETag GlyphShaper::tagArray[] =
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{
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isolFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, emptyTag,
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finaFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, emptyTag,
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initFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, emptyTag,
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mediFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, emptyTag
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};
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#define TAGS_PER_GLYPH (sizeof GlyphShaper::tagArray / sizeof(LETag) / 4)
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void ArabicShaping::shape(const LEUnicode *chars, le_int32 offset, le_int32 charCount, le_int32 charMax,
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le_bool rightToLeft, Shaper &shaper)
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{
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// iterate in logical order, store tags in visible order
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//
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// the effective right char is the most recently encountered
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// non-transparent char
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//
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// four boolean states:
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// the effective right char shapes
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// the effective right char causes left shaping
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// the current char shapes
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// the current char causes right shaping
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//
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// if both cause shaping, then
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// shaper.shape(errout, 2) (isolate to initial, or final to medial)
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// shaper.shape(out, 1) (isolate to final)
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ShapeType rightType = ST_NOSHAPE_NONE, leftType = ST_NOSHAPE_NONE;
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le_int32 i;
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for (i = offset - 1; i >= 0; i -= 1) {
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rightType = getShapeType(chars[i]);
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if (rightType != ST_TRANSPARENT) {
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break;
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}
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}
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for (i = offset + charCount; i < charMax; i += 1) {
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leftType = getShapeType(chars[i]);
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if (leftType != ST_TRANSPARENT) {
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break;
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}
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}
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// erout is effective right logical index
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le_int32 erout = -1;
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le_bool rightShapes = false;
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le_bool rightCauses = (rightType & MASK_SHAPE_LEFT) != 0;
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le_int32 in, e, out = 0, dir = 1;
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if (rightToLeft) {
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out = charCount - 1;
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erout = charCount;
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dir = -1;
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}
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for (in = offset, e = offset + charCount; in < e; in += 1, out += dir) {
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LEUnicode c = chars[in];
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ShapeType t = getShapeType(c);
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shaper.init(c, out, (t & (MASK_TRANSPARENT | MASK_NOSHAPE)) == 0);
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if ((t & MASK_TRANSPARENT) != 0) {
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continue;
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}
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le_bool curShapes = (t & MASK_NOSHAPE) == 0;
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le_bool curCauses = (t & MASK_SHAPE_RIGHT) != 0;
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if (rightCauses && curCauses) {
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if (rightShapes) {
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shaper.shape(erout, 2);
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}
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if (curShapes) {
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shaper.shape(out, 1);
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}
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}
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rightShapes = curShapes;
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rightCauses = (t & MASK_SHAPE_LEFT) != 0;
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erout = out;
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}
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if (rightShapes && rightCauses && (leftType & MASK_SHAPE_RIGHT) != 0) {
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shaper.shape(erout, 2);
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}
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}
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GlyphShaper::GlyphShaper(const LETag **outputTags)
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{
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charTags = outputTags;
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}
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GlyphShaper::~GlyphShaper()
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{
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// nothing to do
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}
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void GlyphShaper::init(LEUnicode ch, le_int32 outIndex, le_bool isloate)
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{
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charTags[outIndex] = tagArray;
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}
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void GlyphShaper::shape(le_int32 outIndex, le_int32 shapeOffset)
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{
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charTags[outIndex] = &charTags[outIndex][TAGS_PER_GLYPH * shapeOffset];
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}
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CharShaper::CharShaper(LEUnicode *outputChars)
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{
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chars = outputChars;
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}
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CharShaper::~CharShaper()
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{
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// nothing to do
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}
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void CharShaper::init(LEUnicode ch, le_int32 outIndex, le_bool isloate)
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{
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if (isloate) {
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chars[outIndex] = getToIsolateShape(ch);
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} else {
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chars[outIndex] = ch;
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}
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}
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void CharShaper::shape(le_int32 outIndex, le_int32 shapeOffset)
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{
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chars[outIndex] += (LEUnicode) shapeOffset;
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}
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LEUnicode CharShaper::isolateShapes[] =
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{
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0xfe80, 0xfe81, 0xfe83, 0xfe85, 0xfe87, 0xfe89, 0xfe8d, 0xfe8f, 0xfe93, 0xfe95,
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0xfe99, 0xfe9d, 0xfea1, 0xfea5, 0xfea9, 0xfeab, 0xfead, 0xfeaf, 0xfeb1, 0xfeb5,
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0xfeb9, 0xfebd, 0xfec1, 0xfec5, 0xfec9, 0xfecd, 0x063b, 0x063c, 0x063d, 0x063e,
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0x063f, 0x0640, 0xfed1, 0xfed5, 0xfed9, 0xfedd, 0xfee1, 0xfee5, 0xfee9, 0xfeed,
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0xfeef, 0xfef1, 0x064b, 0x064c, 0x064d, 0x064e, 0x064f, 0x0650, 0x0651, 0x0652,
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0x0653, 0x0654, 0x0655, 0x0656, 0x0657, 0x0658, 0x0659, 0x065a, 0x065b, 0x065c,
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0x065d, 0x065e, 0x065f, 0x0660, 0x0661, 0x0662, 0x0663, 0x0664, 0x0665, 0x0666,
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0x0667, 0x0668, 0x0669, 0x066a, 0x066b, 0x066c, 0x066d, 0x066e, 0x066f, 0x0670,
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0xfb50, 0x0672, 0x0673, 0x0674, 0x0675, 0x0676, 0xfbdd, 0x0678, 0xfb66, 0xfb5e,
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0xfb52, 0x067c, 0x067d, 0xfb56, 0xfb62, 0xfb5a, 0x0681, 0x0682, 0xfb76, 0xfb72,
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0x0685, 0xfb7a, 0xfb7e, 0xfb88, 0x0689, 0x068a, 0x068b, 0xfb84, 0xfb82, 0xfb86,
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0x068f, 0x0690, 0xfb8c, 0x0692, 0x0693, 0x0694, 0x0695, 0x0696, 0x0697, 0xfb8a,
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0x0699, 0x069a, 0x069b, 0x069c, 0x069d, 0x069e, 0x069f, 0x06a0, 0x06a1, 0x06a2,
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0x06a3, 0xfb6a, 0x06a5, 0xfb6e, 0x06a7, 0x06a8, 0xfb8e, 0x06aa, 0x06ab, 0x06ac,
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0xfbd3, 0x06ae, 0xfb92, 0x06b0, 0xfb9a, 0x06b2, 0xfb96, 0x06b4, 0x06b5, 0x06b6,
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0x06b7, 0x06b8, 0x06b9, 0xfb9e, 0xfba0, 0x06bc, 0x06bd, 0xfbaa, 0x06bf, 0xfba4,
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0xfba6, 0x06c2, 0x06c3, 0x06c4, 0xfbe0, 0xfbd9, 0xfbd7, 0xfbdb, 0xfbe2, 0x06ca,
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0xfbde, 0xfbfc, 0x06cd, 0x06ce, 0x06cf, 0xfbe4, 0x06d1, 0xfbae, 0xfbb0
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};
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LEUnicode CharShaper::getToIsolateShape(LEUnicode ch)
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{
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if (ch < 0x0621 || ch > 0x06d3) {
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return ch;
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}
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return isolateShapes[ch - 0x0621];
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}
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