LayoutEngine.h

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00001 
00002 /*
00003  *
00004  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
00005  *
00006  */
00007 
00008 #ifndef __LAYOUTENGINE_H
00009 #define __LAYOUTENGINE_H
00010 
00011 #include "LETypes.h"
00012 
00018 U_NAMESPACE_BEGIN
00019 
00020 class LEFontInstance;
00021 class LEGlyphFilter;
00022 class LEGlyphStorage;
00023 
00067 class U_LAYOUT_API LayoutEngine : public UObject {
00068 protected:
00074     LEGlyphStorage *fGlyphStorage;
00075 
00083     const LEFontInstance *fFontInstance;
00084 
00092     le_int32 fScriptCode;
00093 
00101     le_int32 fLanguageCode;
00102 
00108     le_int32 fTypoFlags;
00109 
00125     LayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags);
00126 
00134     LayoutEngine();
00135 
00158     virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
00159             LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success);
00160 
00187     virtual le_int32 computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphStorage &glyphStorage, LEErrorCode &success);
00188 
00202     virtual void positionGlyphs(LEGlyphStorage &glyphStorage, float x, float y, LEErrorCode &success);
00203 
00224     virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphStorage &glyphStorage, LEErrorCode &success);
00225 
00238     virtual const void *getFontTable(LETag tableTag) const;
00239 
00265     virtual void mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool mirror, LEGlyphStorage &glyphStorage, LEErrorCode &success);
00266 
00279     static void adjustMarkGlyphs(LEGlyphStorage &glyphStorage, LEGlyphFilter *markFilter, LEErrorCode &success);
00280 
00281 
00300     static void adjustMarkGlyphs(const LEUnicode chars[], le_int32 charCount, le_bool reverse, LEGlyphStorage &glyphStorage, LEGlyphFilter *markFilter, LEErrorCode &success);
00301 
00302 
00303 public:
00312     virtual ~LayoutEngine();
00313 
00335     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);
00336 
00346     le_int32 getGlyphCount() const;
00347 
00358     void getGlyphs(LEGlyphID glyphs[], LEErrorCode &success) const;
00359 
00372     virtual void getGlyphs(le_uint32 glyphs[], le_uint32 extraBits, LEErrorCode &success) const;
00373 
00384     void getCharIndices(le_int32 charIndices[], LEErrorCode &success) const;
00385 
00397     void getCharIndices(le_int32 charIndices[], le_int32 indexBase, LEErrorCode &success) const;
00398 
00410     void getGlyphPositions(float positions[], LEErrorCode &success) const;
00411 
00426     void getGlyphPosition(le_int32 glyphIndex, float &x, float &y, LEErrorCode &success) const;
00427 
00435     virtual void reset();
00436 
00453     static LayoutEngine *layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, LEErrorCode &success);
00454 
00459     static LayoutEngine *layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typo_flags, LEErrorCode &success);
00460 
00466     virtual UClassID getDynamicClassID() const;
00467 
00473     static UClassID getStaticClassID();
00474 
00475 };
00476 
00477 U_NAMESPACE_END
00478 #endif
00479 

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