105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
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/*
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* @(#)ArabicShaping.h 1.6 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
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*
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*/
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#ifndef __ARABICSHAPING_H
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#define __ARABICSHAPING_H
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#include "LETypes.h"
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#include "OpenTypeTables.h"
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class Shaper
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{
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public:
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virtual void init(LEUnicode ch, le_int32 outIndex, le_bool isloate) = 0;
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virtual void shape(le_int32 outIndex, le_int32 shapeOffset) = 0;
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};
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class ArabicShaping
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{
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public:
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// shaping bit masks
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enum ShapingBitMasks
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{
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MASK_SHAPE_RIGHT = 1, // if this bit set, shapes to right
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MASK_SHAPE_LEFT = 2, // if this bit set, shapes to left
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MASK_TRANSPARENT = 4, // if this bit set, is transparent (ignore other bits)
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MASK_NOSHAPE = 8 // if this bit set, don't shape this char, i.e. tatweel
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};
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// shaping values
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enum ShapeTypeValues
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{
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ST_NONE = 0,
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ST_RIGHT = MASK_SHAPE_RIGHT,
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ST_LEFT = MASK_SHAPE_LEFT,
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ST_DUAL = MASK_SHAPE_RIGHT | MASK_SHAPE_LEFT,
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ST_TRANSPARENT = MASK_TRANSPARENT,
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ST_NOSHAPE_DUAL = MASK_NOSHAPE | ST_DUAL,
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ST_NOSHAPE_NONE = MASK_NOSHAPE
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};
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typedef le_int32 ShapeType;
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static void 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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static le_uint8 glyphSubstitutionTable[];
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//static le_uint8 ligatureSubstitutionSubtable[];
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static le_uint8 glyphDefinitionTable[];
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private:
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static ShapeType getShapeType(LEUnicode c);
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static const ShapeType shapeTypes[];
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};
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class GlyphShaper : public Shaper
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{
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public:
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virtual void init(LEUnicode ch, le_int32 outIndex, le_bool isolate);
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virtual void shape(le_int32 outIndex, le_int32 shapeOffset);
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GlyphShaper(const LETag **outputTags);
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~GlyphShaper();
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private:
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const LETag **charTags;
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static const LETag isolFeatureTag; // 'isol'
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static const LETag initFeatureTag; // 'init'
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static const LETag mediFeatureTag; // 'medi'
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static const LETag finaFeatureTag; // 'fina'
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static const LETag ligaFeatureTag; // 'liga'
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static const LETag msetFeatureTag; // 'mset'
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static const LETag markFeatureTag; // 'mark'
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static const LETag emptyTag;
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static const LETag tagArray[];
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};
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class CharShaper : public Shaper
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{
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public:
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virtual void init(LEUnicode ch, le_int32 outIndex, le_bool isolate);
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virtual void shape(le_int32 outIndex, le_int32 shapeOffset);
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CharShaper(LEUnicode *outputChars);
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~CharShaper();
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private:
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LEUnicode *chars;
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static LEUnicode isolateShapes[];
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static LEUnicode getToIsolateShape(LEUnicode ch);
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};
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#endif
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