1 /*
2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3  *
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7  * particular file as subject to the "Classpath" exception as provided
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12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
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25 
26 /*
27  *
28  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
29  *
30  */
31 
32 #ifndef __ARABICSHAPING_H
33 #define __ARABICSHAPING_H
34 
35 /**
36  * \file
37  * \internal
38  */
39 
40 #include "LETypes.h"
41 #include "OpenTypeTables.h"
42 
43 U_NAMESPACE_BEGIN
44 
45 class LEGlyphStorage;
46 
47 class ArabicShaping /* not : public UObject because all methods are static */ {
48 public:
49     // Joining types
50     enum JoiningTypes
51     {
52         JT_NON_JOINING   = 0,
53         JT_JOIN_CAUSING  = 1,
54         JT_DUAL_JOINING  = 2,
55         JT_LEFT_JOINING  = 3,
56         JT_RIGHT_JOINING = 4,
57         JT_TRANSPARENT   = 5,
58         JT_COUNT         = 6
59     };
60 
61     // shaping bit masks
62     enum ShapingBitMasks
63     {
64         MASK_SHAPE_RIGHT    = 1, // if this bit set, shapes to right
65         MASK_SHAPE_LEFT     = 2, // if this bit set, shapes to left
66         MASK_TRANSPARENT    = 4, // if this bit set, is transparent (ignore other bits)
67         MASK_NOSHAPE        = 8  // if this bit set, don't shape this char, i.e. tatweel
68     };
69 
70     // shaping values
71     enum ShapeTypeValues
72     {
73         ST_NONE         = 0,
74         ST_RIGHT        = MASK_SHAPE_RIGHT,
75         ST_LEFT         = MASK_SHAPE_LEFT,
76         ST_DUAL         = MASK_SHAPE_RIGHT | MASK_SHAPE_LEFT,
77         ST_TRANSPARENT  = MASK_TRANSPARENT,
78         ST_NOSHAPE_DUAL = MASK_NOSHAPE | ST_DUAL,
79         ST_NOSHAPE_NONE = MASK_NOSHAPE
80     };
81 
82     typedef le_int32 ShapeType;
83 
84     static void shape(const LEUnicode *chars, le_int32 offset, le_int32 charCount, le_int32 charMax,
85                       le_bool rightToLeft, LEGlyphStorage &glyphStorage);
86 
87     static const FeatureMap *getFeatureMap(le_int32 &count);
88 
89 private:
90     // forbid instantiation
91     ArabicShaping();
92 
93     static ShapeType getShapeType(LEUnicode c);
94 
95     static const le_uint8 shapingTypeTable[];
96     static const size_t   shapingTypeTableLen;
97 
98     static const ShapeType shapeTypes[];
99 
100     static void adjustTags(le_int32 outIndex, le_int32 shapeOffset, LEGlyphStorage &glyphStorage);
101 };
102 
103 U_NAMESPACE_END
104 #endif
105