LayoutEngine.h

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/*
 * (C) Copyright IBM Corp. and others 1998-2014 - All Rights Reserved
 */
 
#ifndef __LAYOUTENGINE_H
#define __LAYOUTENGINE_H
 
#include "LETypes.h"
 
U_NAMESPACE_BEGIN
 
class LEFontInstance;
class LEGlyphFilter;
class LEGlyphStorage;
 
class U_LAYOUT_API LayoutEngine : public UObject {
public:
#ifndef U_HIDE_INTERNAL_API
    static const le_int32 kTypoFlagKern;
    static const le_int32 kTypoFlagLiga;        
#endif  /* U_HIDE_INTERNAL_API */
 
protected:
    LEGlyphStorage *fGlyphStorage;
 
    const LEFontInstance *fFontInstance;
 
    le_int32 fScriptCode;
 
    le_int32 fLanguageCode;
 
    le_int32 fTypoFlags;
 
    le_bool fFilterZeroWidth;
 
#ifndef U_HIDE_INTERNAL_API
    LayoutEngine(const LEFontInstance *fontInstance,
                 le_int32 scriptCode,
                 le_int32 languageCode,
                 le_int32 typoFlags,
                 LEErrorCode &success);
#endif  /* U_HIDE_INTERNAL_API */
 
    // Do not enclose the protected default constructor with #ifndef U_HIDE_INTERNAL_API
    // or else the compiler will create a public default constructor.
    LayoutEngine();
 
    virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
            LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success);
 
    virtual le_int32 computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphStorage &glyphStorage, LEErrorCode &success);
 
    virtual void positionGlyphs(LEGlyphStorage &glyphStorage, float x, float y, LEErrorCode &success);
 
    virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphStorage &glyphStorage, LEErrorCode &success);
 
    virtual const void *getFontTable(LETag tableTag, size_t &length) const;
 
    virtual const void *getFontTable(LETag tableTag) const { size_t ignored; return getFontTable(tableTag, ignored); }
 
    virtual void mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool mirror, LEGlyphStorage &glyphStorage, LEErrorCode &success);
 
#ifndef U_HIDE_INTERNAL_API
    static void adjustMarkGlyphs(LEGlyphStorage &glyphStorage, LEGlyphFilter *markFilter, LEErrorCode &success);
 
 
    static void adjustMarkGlyphs(const LEUnicode chars[], le_int32 charCount, le_bool reverse, LEGlyphStorage &glyphStorage, LEGlyphFilter *markFilter, LEErrorCode &success);
#endif  /* U_HIDE_INTERNAL_API */
 
public:
    virtual ~LayoutEngine();
 
    virtual le_int32 layoutChars(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, float x, float y, LEErrorCode &success);
 
    le_int32 getGlyphCount() const;
 
    void getGlyphs(LEGlyphID glyphs[], LEErrorCode &success) const;
 
    virtual void getGlyphs(le_uint32 glyphs[], le_uint32 extraBits, LEErrorCode &success) const;
 
    void getCharIndices(le_int32 charIndices[], LEErrorCode &success) const;
 
    void getCharIndices(le_int32 charIndices[], le_int32 indexBase, LEErrorCode &success) const;
 
    void getGlyphPositions(float positions[], LEErrorCode &success) const;
 
    void getGlyphPosition(le_int32 glyphIndex, float &x, float &y, LEErrorCode &success) const;
 
    virtual void reset();
 
    static LayoutEngine *layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, LEErrorCode &success);
 
    static LayoutEngine *layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typo_flags, LEErrorCode &success);
 
    virtual UClassID getDynamicClassID() const;
 
    static UClassID getStaticClassID();
 
};
 
U_NAMESPACE_END
#endif