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