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      1 /*
      2  *
      3  * (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
      4  *
      5  */
      6 
      7 #ifndef __GLYPHITERATOR_H
      8 #define __GLYPHITERATOR_H
      9 
     10 /**
     11  * \file
     12  * \internal
     13  */
     14 
     15 #include "LETypes.h"
     16 #include "OpenTypeTables.h"
     17 #include "GlyphDefinitionTables.h"
     18 
     19 U_NAMESPACE_BEGIN
     20 
     21 class LEGlyphStorage;
     22 class GlyphPositionAdjustments;
     23 
     24 class GlyphIterator : public UMemory {
     25 public:
     26     GlyphIterator(LEGlyphStorage &theGlyphStorage, GlyphPositionAdjustments *theGlyphPositionAdjustments, le_bool rightToLeft, le_uint16 theLookupFlags,
     27         FeatureMask theFeatureMask, const GlyphDefinitionTableHeader *theGlyphDefinitionTableHeader);
     28 
     29     GlyphIterator(GlyphIterator &that);
     30 
     31     GlyphIterator(GlyphIterator &that, FeatureMask newFeatureMask);
     32 
     33     GlyphIterator(GlyphIterator &that, le_uint16 newLookupFlags);
     34 
     35     virtual ~GlyphIterator();
     36 
     37     void reset(le_uint16 newLookupFlags, LETag newFeatureTag);
     38 
     39     le_bool next(le_uint32 delta = 1);
     40     le_bool prev(le_uint32 delta = 1);
     41     le_bool findFeatureTag();
     42 
     43     le_bool isRightToLeft() const;
     44     le_bool ignoresMarks() const;
     45 
     46     le_bool baselineIsLogicalEnd() const;
     47 
     48     LEGlyphID getCurrGlyphID() const;
     49     le_int32  getCurrStreamPosition() const;
     50 
     51     le_int32  getMarkComponent(le_int32 markPosition) const;
     52     le_bool   findMark2Glyph();
     53 
     54     void getCursiveEntryPoint(LEPoint &entryPoint) const;
     55     void getCursiveExitPoint(LEPoint &exitPoint) const;
     56 
     57     void setCurrGlyphID(TTGlyphID glyphID);
     58     void setCurrStreamPosition(le_int32 position);
     59     void setCurrGlyphBaseOffset(le_int32 baseOffset);
     60     void adjustCurrGlyphPositionAdjustment(float xPlacementAdjust, float yPlacementAdjust,
     61                                            float xAdvanceAdjust,   float yAdvanceAdjust);
     62 
     63     void setCurrGlyphPositionAdjustment(float xPlacementAdjust, float yPlacementAdjust,
     64                                         float xAdvanceAdjust,   float yAdvanceAdjust);
     65 
     66     void clearCursiveEntryPoint();
     67     void clearCursiveExitPoint();
     68     void setCursiveEntryPoint(LEPoint &entryPoint);
     69     void setCursiveExitPoint(LEPoint &exitPoint);
     70     void setCursiveGlyph();
     71 
     72     LEGlyphID *insertGlyphs(le_int32 count, LEErrorCode& success);
     73     le_int32 applyInsertions();
     74 
     75 private:
     76     le_bool filterGlyph(le_uint32 index) const;
     77     le_bool hasFeatureTag(le_bool matchGroup) const;
     78     le_bool nextInternal(le_uint32 delta = 1);
     79     le_bool prevInternal(le_uint32 delta = 1);
     80 
     81     le_int32  direction;
     82     le_int32  position;
     83     le_int32  nextLimit;
     84     le_int32  prevLimit;
     85 
     86     LEGlyphStorage &glyphStorage;
     87     GlyphPositionAdjustments *glyphPositionAdjustments;
     88 
     89     le_int32    srcIndex;
     90     le_int32    destIndex;
     91     le_uint16   lookupFlags;
     92     FeatureMask featureMask;
     93     le_int32    glyphGroup;
     94 
     95     const GlyphClassDefinitionTable *glyphClassDefinitionTable;
     96     const MarkAttachClassDefinitionTable *markAttachClassDefinitionTable;
     97 
     98     GlyphIterator &operator=(const GlyphIterator &other); // forbid copying of this class
     99 };
    100 
    101 U_NAMESPACE_END
    102 #endif
    103