source/layout/GlyphIterator.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2013 - 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 LEReferenceTo<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);
  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     LEReferenceTo<GlyphClassDefinitionTable> glyphClassDefinitionTable;
  96     LEReferenceTo<MarkAttachClassDefinitionTable> markAttachClassDefinitionTable;
  97
  98     GlyphIterator &operator=(const GlyphIterator &other); // forbid copying of this class
  99
 100     struct {
 101       LEGlyphID   id;
 102       le_bool     result;
 103     } filterCache;
 104     le_bool   filterCacheValid;
 105
 106     void filterResetCache(void);
 107 };
 108
 109 U_NAMESPACE_END
 110 #endif