2000-11-28 20:56:52 +00:00
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/*
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2002-03-27 00:34:56 +00:00
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* @(#)ArabicShaping.h 1.6 00/03/15
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2000-11-28 20:56:52 +00:00
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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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2001-10-16 00:39:01 +00:00
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U_NAMESPACE_BEGIN
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2002-06-27 01:19:20 +00:00
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class Shaper : public UObject {
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2000-11-28 20:56:52 +00:00
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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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2002-06-29 00:04:16 +00:00
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class ArabicShaping /* not : public UObject because all methods are static */ {
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2000-11-28 20:56:52 +00:00
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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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2002-06-10 23:33:56 +00:00
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static const LETag *getFeatureOrder();
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2002-03-27 23:22:21 +00:00
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static const le_uint8 glyphSubstitutionTable[];
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2000-11-28 20:56:52 +00:00
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//static le_uint8 ligatureSubstitutionSubtable[];
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2002-03-27 23:22:21 +00:00
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static const le_uint8 glyphDefinitionTable[];
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2000-11-28 20:56:52 +00:00
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private:
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2002-06-29 00:04:16 +00:00
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// forbid instantiation
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ArabicShaping();
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2000-11-28 20:56:52 +00:00
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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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2002-06-29 00:04:16 +00:00
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/**
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* ICU "poor man's RTTI", returns a UClassID for the actual class.
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*
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* @draft ICU 2.2
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*/
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virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }
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/**
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* ICU "poor man's RTTI", returns a UClassID for this class.
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*
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* @draft ICU 2.2
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*/
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static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }
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2000-11-28 20:56:52 +00:00
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private:
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const LETag **charTags;
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2002-06-10 23:33:56 +00:00
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#if 0
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2000-11-28 20:56:52 +00:00
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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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2002-06-10 23:33:56 +00:00
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#endif
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2000-11-28 20:56:52 +00:00
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static const LETag tagArray[];
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2002-06-29 00:04:16 +00:00
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/**
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* The address of this static class variable serves as this class's ID
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* for ICU "poor man's RTTI".
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*/
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static const char fgClassID;
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2000-11-28 20:56:52 +00:00
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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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2002-03-27 00:34:56 +00:00
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static const LEUnicode isolateShapes[];
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2000-11-28 20:56:52 +00:00
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static LEUnicode getToIsolateShape(LEUnicode ch);
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};
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2001-10-16 00:39:01 +00:00
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U_NAMESPACE_END
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2000-11-28 20:56:52 +00:00
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#endif
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