icuSources/layout/ArabicShaping.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
   4  *
   5  */
   6
   7 #ifndef __ARABICSHAPING_H
   8 #define __ARABICSHAPING_H
   9
  10 /**
  11  * \file
  12  * \internal
  13  */
  14
  15 #include "LETypes.h"
  16 #include "OpenTypeTables.h"
  17
  18 U_NAMESPACE_BEGIN
  19
  20 class LEGlyphStorage;
  21
  22 class ArabicShaping /* not : public UObject because all methods are static */ {
  23 public:
  24     // Joining types
  25     enum JoiningTypes
  26     {
  27         JT_NON_JOINING   = 0,
  28         JT_JOIN_CAUSING  = 1,
  29         JT_DUAL_JOINING  = 2,
  30         JT_LEFT_JOINING  = 3,
  31         JT_RIGHT_JOINING = 4,
  32         JT_TRANSPARENT   = 5,
  33         JT_COUNT         = 6
  34     };
  35
  36     // shaping bit masks
  37     enum ShapingBitMasks
  38     {
  39         MASK_SHAPE_RIGHT    = 1, // if this bit set, shapes to right
  40         MASK_SHAPE_LEFT     = 2, // if this bit set, shapes to left
  41         MASK_TRANSPARENT    = 4, // if this bit set, is transparent (ignore other bits)
  42         MASK_NOSHAPE        = 8  // if this bit set, don't shape this char, i.e. tatweel
  43     };
  44
  45     // shaping values
  46     enum ShapeTypeValues
  47     {
  48         ST_NONE         = 0,
  49         ST_RIGHT        = MASK_SHAPE_RIGHT,
  50         ST_LEFT         = MASK_SHAPE_LEFT,
  51         ST_DUAL         = MASK_SHAPE_RIGHT | MASK_SHAPE_LEFT,
  52         ST_TRANSPARENT  = MASK_TRANSPARENT,
  53         ST_NOSHAPE_DUAL = MASK_NOSHAPE | ST_DUAL,
  54         ST_NOSHAPE_NONE = MASK_NOSHAPE
  55     };
  56
  57     typedef le_int32 ShapeType;
  58
  59     static void shape(const LEUnicode *chars, le_int32 offset, le_int32 charCount, le_int32 charMax,
  60                       le_bool rightToLeft, LEGlyphStorage &glyphStorage);
  61
  62     static const FeatureMap *getFeatureMap(le_int32 &count);
  63
  64 private:
  65     // forbid instantiation
  66     ArabicShaping();
  67
  68     static ShapeType getShapeType(LEUnicode c);
  69
  70     static const le_uint8 shapingTypeTable[];
  71     static const size_t   shapingTypeTableLen;
  72
  73     static const ShapeType shapeTypes[];
  74
  75     static void adjustTags(le_int32 outIndex, le_int32 shapeOffset, LEGlyphStorage &glyphStorage);
  76 };
  77
  78 U_NAMESPACE_END
  79 #endif