icuSources/layout/GlyphIterator.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2004 - 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 #include "GlyphPositionAdjustments.h"
  19
  20 U_NAMESPACE_BEGIN
  21
  22 class LEGlyphStorage;
  23
  24 class GlyphIterator : public UMemory {
  25 public:
  26     GlyphIterator(LEGlyphStorage &theGlyphStorage, GlyphPositionAdjustment *theGlyphPositionAdjustments, le_bool rightToLeft, le_uint16 theLookupFlags, LETag theFeatureTag,
  27         const GlyphDefinitionTableHeader *theGlyphDefinitionTableHeader);
  28
  29     GlyphIterator(GlyphIterator &that);
  30
  31     GlyphIterator(GlyphIterator &that, LETag newFeatureTag);
  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     le_bool hasCursiveFirstExitPoint() const;
  48     le_bool hasCursiveLastExitPoint() const;
  49
  50     LEGlyphID getCurrGlyphID() const;
  51     le_int32  getCurrStreamPosition() const;
  52     void   getCurrGlyphPositionAdjustment(GlyphPositionAdjustment &adjustment) const;
  53
  54     le_int32  getMarkComponent(le_int32 markPosition) const;
  55     le_bool   findMark2Glyph();
  56
  57     void getCursiveLastExitPoint(LEPoint &exitPoint) const;
  58     LEGlyphID getCursiveLastGlyphID() const;
  59     float getCursiveBaselineAdjustment() const;
  60     void getCursiveLastPositionAdjustment(GlyphPositionAdjustment &adjustment) const;
  61
  62     void setCurrGlyphID(TTGlyphID glyphID);
  63     void setCurrStreamPosition(le_int32 position);
  64     void setCurrGlyphPositionAdjustment(const GlyphPositionAdjustment *adjustment);
  65     void setCurrGlyphBaseOffset(le_int32 baseOffset);
  66     void adjustCurrGlyphPositionAdjustment(float xPlacementAdjust, float yPlacementAdjust,
  67                                            float xAdvanceAdjust,   float yAdvanceAdjust);
  68
  69     void setCurrGlyphPositionAdjustment(float xPlacementAdjust, float yPlacementAdjust,
  70                                         float xAdvanceAdjust,   float yAdvanceAdjust);
  71
  72     void setCursiveFirstExitPoint();
  73     void resetCursiveLastExitPoint();
  74     void setCursiveLastExitPoint(LEPoint &exitPoint);
  75     void setCursiveBaselineAdjustment(float adjustment);
  76     void adjustCursiveLastGlyphPositionAdjustment(float xPlacmentAdjust, float yPlacementAdjust,
  77                                            float xAdvanceAdjust, float yAdvanceAdjust);
  78
  79     LEGlyphID *insertGlyphs(le_int32 count);
  80     le_int32 applyInsertions();
  81
  82 private:
  83     le_bool filterGlyph(le_uint32 index) const;
  84     le_bool hasFeatureTag() const;
  85     le_bool nextInternal(le_uint32 delta = 1);
  86     le_bool prevInternal(le_uint32 delta = 1);
  87
  88     le_int32  direction;
  89     le_int32  position;
  90     le_int32  nextLimit;
  91     le_int32  prevLimit;
  92     le_int32  cursiveFirstPosition;
  93     le_int32  cursiveLastPosition;
  94     float     cursiveBaselineAdjustment;
  95     LEPoint   cursiveLastExitPoint;
  96     LEGlyphStorage &glyphStorage;
  97     GlyphPositionAdjustment *glyphPositionAdjustments;
  98     le_int32 srcIndex;
  99     le_int32 destIndex;
 100     le_uint16 lookupFlags;
 101     LETag    featureTag;
 102     const GlyphClassDefinitionTable *glyphClassDefinitionTable;
 103     const MarkAttachClassDefinitionTable *markAttachClassDefinitionTable;
 104
 105     GlyphIterator &operator=(const GlyphIterator &other); // forbid copying of this class
 106 };
 107
 108 U_NAMESPACE_END
 109 #endif