icuSources/layout/ArabicShaping.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2004 - 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     // shaping bit masks
  25     enum ShapingBitMasks
  26     {
  27         MASK_SHAPE_RIGHT    = 1, // if this bit set, shapes to right
  28         MASK_SHAPE_LEFT     = 2, // if this bit set, shapes to left
  29         MASK_TRANSPARENT    = 4, // if this bit set, is transparent (ignore other bits)
  30         MASK_NOSHAPE        = 8  // if this bit set, don't shape this char, i.e. tatweel
  31     };
  32
  33     // shaping values
  34     enum ShapeTypeValues
  35     {
  36         ST_NONE         = 0,
  37         ST_RIGHT        = MASK_SHAPE_RIGHT,
  38         ST_LEFT         = MASK_SHAPE_LEFT,
  39         ST_DUAL         = MASK_SHAPE_RIGHT | MASK_SHAPE_LEFT,
  40         ST_TRANSPARENT  = MASK_TRANSPARENT,
  41         ST_NOSHAPE_DUAL = MASK_NOSHAPE | ST_DUAL,
  42         ST_NOSHAPE_NONE = MASK_NOSHAPE
  43     };
  44
  45     typedef le_int32 ShapeType;
  46
  47     static void shape(const LEUnicode *chars, le_int32 offset, le_int32 charCount, le_int32 charMax,
  48                       le_bool rightToLeft, LEGlyphStorage &glyphStorage);
  49
  50     static const LETag *getFeatureOrder();
  51
  52 private:
  53     // forbid instantiation
  54     ArabicShaping();
  55
  56     static const LETag tagArray[];
  57
  58     static ShapeType getShapeType(LEUnicode c);
  59
  60     static const ShapeType shapeTypes[];
  61
  62     static void adjustTags(le_int32 outIndex, le_int32 shapeOffset, LEGlyphStorage &glyphStorage);
  63 };
  64
  65 U_NAMESPACE_END
  66 #endif