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