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ArabicLayoutEngine.h

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00001 
00002 /*
00003  * @(#)ArabicLayoutEngine.h     1.3 00/03/15
00004  *
00005  * (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
00006  *
00007  */
00008 
00009 #ifndef __ARABICLAYOUTENGINE_H
00010 #define __ARABICLAYOUTENGINE_H
00011 
00012 #include "LETypes.h"
00013 #include "LEFontInstance.h"
00014 #include "LEGlyphFilter.h"
00015 #include "LayoutEngine.h"
00016 #include "OpenTypeLayoutEngine.h"
00017 
00018 #include "GlyphSubstitutionTables.h"
00019 #include "GlyphDefinitionTables.h"
00020 #include "GlyphPositioningTables.h"
00021 
00028 class ArabicOpenTypeLayoutEngine : public OpenTypeLayoutEngine
00029 {
00030 public:
00046     ArabicOpenTypeLayoutEngine(LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
00047                             GlyphSubstitutionTableHeader *gsubTable);
00048 
00060     ArabicOpenTypeLayoutEngine(LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode);
00061 
00065     virtual ~ArabicOpenTypeLayoutEngine();
00066 
00067 protected:
00068 
00087     virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
00088             LEUnicode *&outChars, le_int32 *&charIndices, const LETag **&featureTags);
00089 
00104     virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphID glyphs[], le_int32 glyphCount, float positions[]);
00105 };
00106 
00117 class UnicodeArabicOpenTypeLayoutEngine : public ArabicOpenTypeLayoutEngine
00118 {
00119 public:
00131     UnicodeArabicOpenTypeLayoutEngine(LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode);
00132 
00136     virtual ~UnicodeArabicOpenTypeLayoutEngine();
00137 
00138 protected:
00139 
00155     virtual le_int32 glyphPostProcessing(LEGlyphID tempGlyphs[], le_int32 tempCharIndices[], le_int32 tempGlyphCount,
00156                     LEGlyphID *&glyphs, le_int32 *&charIndices);
00157 
00173     virtual void mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool mirror,
00174         LEGlyphID *&glyphs, le_int32 *&charIndices);
00175 
00189     virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphID glyphs[], le_int32 glyphCount, float positions[]);
00190 };
00191 
00192 #endif
00193 

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