Symaptic: os/textandloc/fontservices/textshaperplugin/IcuSource/layout/ThaiShaping.h@bde4ae8d615e

     1 /*

     2  *

     3  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved

     4  *

     5  */

     7 #ifndef __THAISHAPING_H

     8 #define __THAISHAPING_H

    10 /**

    11  * \file

    12  * \internal

    13  */

    15 #include "LETypes.h"

    16 #include "LEGlyphFilter.h"

    17 #include "OpenTypeTables.h"

    19 U_NAMESPACE_BEGIN

    21 class LEGlyphStorage;

    23 class ThaiShaping /* not : public UObject because all methods are static */ {

    24 public:

    26     enum {

    27         // Character classes

    28         NON =  0,

    29         CON =  1,

    30         COA =  2,

    31         COD =  3,

    32         LVO =  4,

    33         FV1 =  5,

    34         FV2 =  6,

    35         FV3 =  7,

    36         BV1 =  8,

    37         BV2 =  9,

    38         BDI = 10,

    39         TON = 11,

    40         AD1 = 12,

    41         AD2 = 13,

    42         AD3 = 14,

    43         NIK = 15,

    44         AV1 = 16,

    45         AV2 = 17,

    46         AV3 = 18,

    47         classCount = 19,

    49         // State Transition actions

    50         tA  =  0,

    51         tC  =  1,

    52         tD  =  2,

    53         tE  =  3,

    54         tF  =  4,

    55         tG  =  5,

    56         tH  =  6,

    57         tR  =  7,

    58         tS  =  8

    59     };

    61     struct StateTransition

    62     {

    63         le_uint8 nextState;

    64         le_uint8 action;

    66         le_uint8 getNextState() { return nextState; };

    67         le_uint8 getAction() { return action; };

    68     };

    70     static le_int32 compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet,

    71         LEUnicode errorChar, LEUnicode *output, LEGlyphStorage &glyphStorage);

    73 private:

    74     // forbid instantiation

    75     ThaiShaping();

    77     static const le_uint8 classTable[];

    78     static const StateTransition thaiStateTable[][classCount];

    80     inline static StateTransition getTransition(le_uint8 state, le_uint8 currClass);

    82     static le_uint8 doTransition(StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet,

    83         LEUnicode errorChar, LEUnicode *outputBuffer, LEGlyphStorage &glyphStorage, le_int32 &outputIndex);

    85     static le_uint8 getNextState(LEUnicode ch, le_uint8 state, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar,

    86         le_uint8 &charClass, LEUnicode *output, LEGlyphStorage &glyphStorage, le_int32 &outputIndex);

    88     static le_bool isLegalHere(LEUnicode ch, le_uint8 prevState);

    89     static le_uint8 getCharClass(LEUnicode ch);

    91     static LEUnicode noDescenderCOD(LEUnicode cod, le_uint8 glyphSet);

    92     static LEUnicode leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet);

    93     static LEUnicode lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet);

    94     static LEUnicode lowerRightTone(LEUnicode tone, le_uint8 glyphSet);

    95     static LEUnicode lowerLeftTone(LEUnicode tone, le_uint8 glyphSet);

    96     static LEUnicode upperLeftTone(LEUnicode tone, le_uint8 glyphSet);

    98 };

   100 inline ThaiShaping::StateTransition ThaiShaping::getTransition(le_uint8 state, le_uint8 currClass)

   101 {

   102     return thaiStateTable[state][currClass];

   103 }

   105 U_NAMESPACE_END

   106 #endif

author	sl@SLION-WIN7.fritz.box
	Fri, 15 Jun 2012 03:10:57 +0200
changeset 0	bde4ae8d615e
permissions	-rw-r--r--