| /* |
| * |
| * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved |
| * |
| */ |
| |
| #include "LETypes.h" |
| #include "OpenTypeTables.h" |
| #include "ArabicShaping.h" |
| #include "LEGlyphStorage.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| 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[] = |
| { |
| _t_, _t_, _t_, _t_, _t_, _t_, _x_, _x_, _x_, _x_, _x_, _n_, _x_, _x_, _x_, _n_, // 0x610 - 0x61f |
| _x_, _n_, _r_, _r_, _r_, _r_, _d_, _r_, _d_, _r_, _d_, _d_, _d_, _d_, _d_, _r_, // 0x620 - 0x62f |
| _r_, _r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _x_, _x_, _x_, _x_, _x_, // 0x630 - 0x63f |
| _c_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _r_, _d_, _d_, _t_, _t_, _t_, _t_, _t_, // 0x640 - 0x64f |
| _t_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _x_, _x_, _x_, _x_, _x_, _x_, _x_, // 0x650 - 0x65f |
| _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _d_, _d_, // 0x660 - 0x66f |
| _t_, _r_, _r_, _r_, _n_, _r_, _r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x670 - 0x67f |
| _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, // 0x680 - 0x68f |
| _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x690 - 0x69f |
| _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x6a0 - 0x6af |
| _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x6b0 - 0x6bf |
| _r_, _d_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _d_, _r_, _d_, _r_, // 0x6c0 - 0x6cf |
| _d_, _d_, _r_, _r_, _n_, _r_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _x_, _t_, _t_, // 0x6d0 - 0x6df |
| _t_, _t_, _t_, _t_, _t_, _n_, _n_, _t_, _t_, _n_, _t_, _t_, _t_, _t_, _r_, _r_, // 0x6e0 - 0x6ef |
| _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _d_, _d_, _d_, _n_, _n_, _d_ // 0x6f0 - 0x6ff |
| }; |
| |
| /* |
| shaping array holds types for Arabic chars between 0610 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 >= 0x0610 && c <= 0x206f) { |
| if (c < 0x0700) { |
| return shapeTypes[c - 0x0610]; |
| } 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; |
| } |
| |
| static const LETag isolFeatureTag = LE_ISOL_FEATURE_TAG; |
| static const LETag initFeatureTag = LE_INIT_FEATURE_TAG; |
| static const LETag mediFeatureTag = LE_MEDI_FEATURE_TAG; |
| static const LETag finaFeatureTag = LE_FINA_FEATURE_TAG; |
| static const LETag ligaFeatureTag = LE_LIGA_FEATURE_TAG; |
| static const LETag msetFeatureTag = LE_MSET_FEATURE_TAG; |
| static const LETag markFeatureTag = LE_MARK_FEATURE_TAG; |
| static const LETag ccmpFeatureTag = LE_CCMP_FEATURE_TAG; |
| static const LETag rligFeatureTag = LE_RLIG_FEATURE_TAG; |
| static const LETag caltFeatureTag = LE_CALT_FEATURE_TAG; |
| static const LETag dligFeatureTag = LE_DLIG_FEATURE_TAG; |
| static const LETag cswhFeatureTag = LE_CSWH_FEATURE_TAG; |
| static const LETag cursFeatureTag = LE_CURS_FEATURE_TAG; |
| static const LETag kernFeatureTag = LE_KERN_FEATURE_TAG; |
| static const LETag mkmkFeatureTag = LE_MKMK_FEATURE_TAG; |
| |
| static const LETag emptyTag = 0x00000000; // '' |
| |
| static const LETag featureOrder[] = |
| { |
| ccmpFeatureTag, isolFeatureTag, finaFeatureTag, mediFeatureTag, initFeatureTag, rligFeatureTag, |
| caltFeatureTag, ligaFeatureTag, dligFeatureTag, cswhFeatureTag, msetFeatureTag, cursFeatureTag, |
| kernFeatureTag, markFeatureTag, mkmkFeatureTag, emptyTag |
| }; |
| |
| const LETag ArabicShaping::tagArray[] = |
| { |
| isolFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, ccmpFeatureTag, rligFeatureTag, |
| caltFeatureTag, dligFeatureTag, cswhFeatureTag, cursFeatureTag, kernFeatureTag, mkmkFeatureTag, emptyTag, |
| |
| finaFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, ccmpFeatureTag, rligFeatureTag, |
| caltFeatureTag, dligFeatureTag, cswhFeatureTag, cursFeatureTag, kernFeatureTag, mkmkFeatureTag, emptyTag, |
| |
| initFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, ccmpFeatureTag, rligFeatureTag, |
| caltFeatureTag, dligFeatureTag, cswhFeatureTag, cursFeatureTag, kernFeatureTag, mkmkFeatureTag, emptyTag, |
| |
| mediFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, ccmpFeatureTag, rligFeatureTag, |
| caltFeatureTag, dligFeatureTag, cswhFeatureTag, cursFeatureTag, kernFeatureTag, mkmkFeatureTag, emptyTag |
| }; |
| |
| #define TAGS_PER_GLYPH ((sizeof ArabicShaping::tagArray / sizeof ArabicShaping::tagArray[0]) / 4) |
| |
| const LETag *ArabicShaping::getFeatureOrder() |
| { |
| return featureOrder; |
| } |
| |
| void ArabicShaping::adjustTags(le_int32 outIndex, le_int32 shapeOffset, LEGlyphStorage &glyphStorage) |
| { |
| LEErrorCode success = LE_NO_ERROR; |
| const LETag *glyphTags = (const LETag *) glyphStorage.getAuxData(outIndex, success); |
| |
| glyphStorage.setAuxData(outIndex, (void *) &glyphTags[TAGS_PER_GLYPH * shapeOffset], success); |
| } |
| |
| void ArabicShaping::shape(const LEUnicode *chars, le_int32 offset, le_int32 charCount, le_int32 charMax, |
| le_bool rightToLeft, LEGlyphStorage &glyphStorage) |
| { |
| // 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; |
| LEErrorCode success = LE_NO_ERROR; |
| 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); |
| |
| glyphStorage.setAuxData(out, (void *) tagArray, success); |
| |
| 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) { |
| adjustTags(erout, 2, glyphStorage); |
| } |
| |
| if (curShapes) { |
| adjustTags(out, 1, glyphStorage); |
| } |
| } |
| |
| rightShapes = curShapes; |
| rightCauses = (t & MASK_SHAPE_LEFT) != 0; |
| erout = out; |
| } |
| |
| if (rightShapes && rightCauses && (leftType & MASK_SHAPE_RIGHT) != 0) { |
| adjustTags(erout, 2, glyphStorage); |
| } |
| } |
| |
| U_NAMESPACE_END |