diff -r 000000000000 -r bde4ae8d615e os/textandloc/fontservices/textshaperplugin/IcuSource/layout/ArabicShaping.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/os/textandloc/fontservices/textshaperplugin/IcuSource/layout/ArabicShaping.cpp Fri Jun 15 03:10:57 2012 +0200 @@ -0,0 +1,206 @@ +/* + * + * (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