1 // Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 /**

    17  @file

    18  @internalComponent

    19 */

    20 

    21 #include "FontIndic.h"

    22 #include <gdi.h>

    23 #include "GlyphSel.h"

    24 #include "ShapeInfo.h"

    25 #include "gdiinline.inl"

    26 

    27 // State machine for determining syllable boundaries.

    28 // Key: D = Dependent vowel. V = Virama. N = Nukta

    29 // I = Independent Vowel. S = Candrabindu/Anusvara/Visarga

    30 // C = Consonant. J = zero-width joiner. X = Other

    31 // A = Addak (double the following constant)

    32 enum TSyllableState

    33 	{

    34 	EReject = -1,

    35 	// Begin + I: add and move to IndependentVowel

    36 	// Begin + C: add and move to Consonant

    37 	// Begin + V/N/D/S/J/X: add and close syllable

    38 	EBegin = 0,

    39 	// Consonant + D: add and move to ConsonantVowel

    40 	// Consonant + N: add

    41 	// Consonant + V: add and move to Virama

    42 	// Consonant + S: add and close syllable

    43 	// Consonant + C/I/J/X: close syllable

    44 	EConsonant = 1,

    45 	// Consonant2 + D: add and move to ConsonantVowel

    46 	// Consonant2 + N: add

    47 	// Consonant2 + V: add and move to Virama2

    48 	// Consonant2 + S: add and close syllable

    49 	// Consonant2 + C/I/J/X: close syllable

    50 	EConsonant2 = 2,

    51 	// Consonant3 + D: add and move to ConsonantVowel

    52 	// Consonant3 + N: add

    53 	// Consonant3 + V: add and move to Virama3

    54 	// Consonant3 + S: add and close syllable

    55 	// Consonant3 + C/I/J/X: close syllable

    56 	EConsonant3 = 3,

    57 	// Consonant + D: add and move to ConsonantVowel

    58 	// Consonant + N: add

    59 	// Consonant + V: add and close syllable

    60 	// Consonant + S: add and close syllable

    61 	// Consonant + C/I/J/X: close syllable

    62 	EConsonant4 = 4,

    63 	// IndependentVowel + S: add

    64 	// IndependentVowel + D/V/N/I/C/J/X: close syllable

    65 	EIndependentVowel = 5,

    66 	// Virama + C: add and move to Consonant

    67 	// Virama + J: add and close syllable

    68 	// Virama + N/V/D/I/S/X: close syllable

    69 	EVirama = 6,

    70 	// Virama2 + C: add and move to Consonant3

    71 	// Virama2 + J: add and close syllable

    72 	// Virama2 + N/V/D/I/S/X: close syllable

    73 	EVirama2 = 7,

    74 	// Virama3 + C: add and move to Consonant4

    75 	// Virama3 + J: add and close syllable

    76 	// Virama3 + N/V/D/I/S/X: close syllable

    77 	EVirama3 = 8,

    78 	// Virama4 + J: add and close syllable

    79 	// Virama4 + CN/V/D/I/S/X: close syllable

    80 	EVirama4 = 9,

    81 	// ConsonantVowel + S: add

    82 	// ConsonantVowel + D/V/N/I/C/J/X: close syllable

    83 	EConsonantVowel = 10,

    84 	// NuktaConsonant + D/V: add

    85 	// NuktaConsonant + S/N/I/C/J/X: close syllable

    86 	ENuktaConsonant = 11,

    87 	// NuktaConsonant + D/V: add

    88 	// NuktaConsonant + S/N/I/C/J/X: close syllable

    89 	ENuktaConsonant2 = 12,

    90 	// NuktaConsonant + D/V: add

    91 	// NuktaConsonant + S/N/I/C/J/X: close syllable

    92 	ENuktaConsonant3 = 13,

    93 	// NuktaConsonant + D: add

    94 	// NuktaConsonant + V/S/N/I/C/J/X: close syllable

    95 	ENuktaConsonant4 = 14,

    96 	// IndependentVowelA + CANDRA E: add

    97 	// IndependentVowelA + anything else: close syllable

    98 	EIndependentVowelA = 15,

    99 	// ZeroWidthJoinerC + V: add

   100 	// ZeroWidthJoinerC + C/S/N/I/J/X/D: close syllable

   101 	EZeroWidthJoinerC = 16,

   102 	// ZeroWidthJoinerA + CANDRA E: add

   103 	// ZeroWidthJoinerA +anything else: close syllable

   104 	EZeroWidthJoinerA = 17,

   105 	// ZeroWidthJoinerV + C/N: add

   106 	// ZeroWidthJoinerV + anything else: close syllable

   107 	EZeroWidthJoinerV = 18,

   108 	// ZeroWidthJoinerV2 + C/N: add

   109 	// ZeroWidthJoinerV2 + anything else: close syllable

   110 	EZeroWidthJoinerV2 = 19,

   111 	// ZeroWidthJoinerV3 + C/N: add

   112 	// ZeroWidthJoinerV3 + anything else: close syllable

   113 	EZeroWidthJoinerV3 =20,

   114 	// EKannadaRa + C/N/V/ZWJ(C): add

   115 	EKannadaRa = 21,

   116 	// ESplitVowel1 + SV2: add and close syllable

   117 	// ESPlitVowel1 + anything else: close syllable

   118 	ESplitVowel1 = 22,

   119 	//EGurBearerA + EIndicCodeGurDependentVowelA: add and move to EIndependentVowel

   120 	//EGurBearerA + modifier: add and close syllable

   121 	//EGurBearerA + anything else: close syllable

   122 	EGurBearerA = 23,

   123 	//EGurBearerU + EIndicCodeGurDependentVowelU: add and move to EIndependentVowel

   124 	//EGurBearerU + anything else: close syllable

   125 	EGurBearerU = 24,

   126 	//EGurBearerI + EIndicCodeGurDependentVowelI: add and move to EIndependentVowel

   127 	//EGurBearerI + anything else: close syllable	

   128 	EGurBearerI = 25,

   129 	

   130 	EConsonantMalaChillu = 26,

   131 	EConsonantMalaChillu2 = 27,

   132 	EConsonantMalaChillu3 = 28,

   133 	EViramaMalaChillu = 29,

   134 	EViramaMalaChillu2 = 30,

   135 	EViramaMalaChillu3 = 31,

   136 	EConsonantMalaChilluNA = 32,

   137 	EConsonantMalaChilluNA2 = 33,

   138 	EConsonantMalaChilluNA3 = 34,

   139 	EViramaMalaChilluNA = 35,

   140 	EViramaMalaChilluNA2 = 36,

   141 	EViramaMalaChilluNA3 = 37,

   142 	EZeroWidthJoinerMalaChilluNA = 38,

   143 	EZeroWidthJoinerMalaChilluNA2 = 39,

   144 	EZeroWidthJoinerMalaChilluNA3 = 40,

   145 	// Add and close acceptances go here.

   146 	EAccept = 41

   147 	};

   148 

   149 /** Defines the transitions for a state machine for determining syllable

   150 boundaries. The machine starts in state 0. On receiving a character of type t

   151 while in state s, moves to state KStateResponse[s][t]. */

   152 const TSyllableState KStateResponse[42][24] =

   153 	{

   154 	// EBegin -- nothing added yet

   155 	{EAccept, EAccept, EIndependentVowel, EConsonant, EAccept, EAccept, EAccept, EAccept, ENuktaConsonant, EIndependentVowelA, EAccept, EKannadaRa, EAccept, EAccept, EAccept, EGurBearerA, EGurBearerU, EGurBearerI, EAccept, EAccept, EAccept, EConsonantMalaChillu,EConsonantMalaChilluNA,EConsonant},

   156 	// EConsonant -- seen a consonant either at the start or after virama

   157 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama, ENuktaConsonant, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   158 	// EConsonant2 -- seen a consonant after virama

   159 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama2, ENuktaConsonant2, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   160 	// EConsonant3 -- seen a consonant after virama2 

   161 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama3, ENuktaConsonant3, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   162 	// EConsonant4 -- seen a consonant after virama3

   163 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama4, ENuktaConsonant4, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   164 	// EIndependentVowel -- possibly nasalized. I haven't bothered to distinguish between

   165 	// nasalization and visarga.

   166 	{EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject},

   167 	// EVirama -- just seen a virama in a legal context. Must be consonant or ZWJ next

   168 	{EReject, EReject, EReject, EConsonant2, EReject, EReject, EReject, EZeroWidthJoinerV, ENuktaConsonant2, EReject, EReject, EConsonant2, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantMalaChillu2,EConsonantMalaChilluNA2,EConsonant2},

   169 	// EVirama2 -- just seen a virama in a legal context. Must be consonant2

   170 	{EReject, EReject, EReject, EConsonant3, EReject, EReject, EReject, EZeroWidthJoinerV2, ENuktaConsonant3, EReject, EReject, EConsonant3, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantMalaChillu3,EConsonantMalaChilluNA3,EConsonant3},

   171 	// EVirama3 -- just seen a virama in a legal context. Must be consonant3

   172 	{EReject, EReject, EReject, EConsonant4, EReject, EReject, EReject, EZeroWidthJoinerV3, ENuktaConsonant4, EReject, EReject, EConsonant4, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonant4,EConsonant4,EConsonant4},

   173 	// EVirama4 -- just seen a virama in a legal context. Must be consonant4

   174 	{EReject, EReject, EReject, EReject, EReject, EReject, EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject},

   175 	// EConsonantVowel -- Just seen a consonant with matra. Can only nasalize or visarg

   176 	{EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject},

   177 	// ENuktaConsonant -- Just seen a consonant with Nukta. Can only accept a dependant vowel or a Virama at this stage.

   178 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   179 	// ENuktaConsonant2 -- Just seen a consonant with Nukta after a virama.

   180 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama2, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   181 	// ENuktaConsonant3 -- Just seen a consonant with Nukta after Virama2.

   182 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama3, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   183 	// ENuktaConsonant4 -- Just seen a consonant with Nukta after Virama3.

   184 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama4, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   185 	// EIndependentVowelA -- Special case Devanagari independent vowel

   186 	{EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EZeroWidthJoinerA, EReject, EReject, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   187 	// EZeroWidthJoinerC -- Just seen a ZWJ after a consonant

   188 	{EReject, EReject, EReject, EReject, EReject, EVirama, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject},

   189 	// EZeroWidthJoinerA -- Just seen a ZWJ after the dependent Vowel A

   190 	{EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject},

   191 	// EZeroWidthJoinerV -- Just seen the ZWJ after the first pair of consonant + virama

   192 	{EReject, EAccept, EReject, EConsonant2, EReject, EReject, EReject, EReject, ENuktaConsonant2, EReject, EReject, EConsonant2, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantMalaChillu2,EConsonantMalaChilluNA2,EConsonant2},

   193 	// EZeroWidthJoinerV2 -- Just seen the ZWJ after consonant + virama + consonant + virama

   194 	{EReject, EAccept, EReject, EConsonant3, EReject, EReject, EReject, EReject, ENuktaConsonant3, EReject, EReject, EConsonant3, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantMalaChillu3,EConsonantMalaChilluNA3,EConsonant3},

   195 	// EZeroWidthJoinerV3 -- Just seen the ZWJ after consonant + virama + consonant + virama + consonant + virama

   196 	{EReject, EAccept, EReject, EConsonant4, EReject, EReject, EReject, EReject, ENuktaConsonant4, EReject, EReject, EConsonant4, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonant4,EConsonant4,EConsonant4},

   197 	// EKannadaRa -- Special case consonant

   198 	{EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama, ENuktaConsonant, EZeroWidthJoinerC, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject},

   199 	// ESplitVowel1 -- Just seen a consonant with first part of a split vowel. Can only nasalize, visarg or add second part of splt vowel

   200 	{EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject},

   201 	// EGurBearerA -- Just seen a dependent Vowel EIndicCodeGurDependentVowelA and modifier

   202 	{EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EIndependentVowel, EReject, EReject, EReject,EReject,EReject},

   203 	// EGurBearerU -- Just seen a dependent Vowel EIndicCodeGurDependentVowelU

   204 	{EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EIndependentVowel, EReject, EReject,EReject,EReject},

   205 	// EGurBearerI -- Just seen a dependent Vowel EIndicCodeGurDependentVowelI

   206 	{EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EIndependentVowel, EReject,EReject,EReject},

   207 	

   208 	{EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChillu,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject},

   209 	{EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChillu2,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject},

   210 	{EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChillu3,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject},

   211 	{EReject,EReject,EReject,EConsonant2,EReject,EReject,EReject,EAccept,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonantMalaChillu2,EConsonantMalaChilluNA2,EConsonant2},

   212 	{EReject,EReject,EReject,EConsonant3,EReject,EReject,EReject,EAccept,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonantMalaChillu3,EConsonantMalaChilluNA3,EConsonant3},

   213 	{EReject,EReject,EReject,EConsonant4,EReject,EReject,EReject,EAccept,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant4,EConsonant4,EConsonant4},

   214 	{EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChilluNA,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject},

   215 	{EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChilluNA2,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject},

   216 	{EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChilluNA3,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject},

   217 	{EReject,EReject,EReject,EConsonant2,EReject,EReject,EReject,EZeroWidthJoinerMalaChilluNA,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonantMalaChillu2,EConsonantMalaChilluNA2,EConsonant2},

   218 	{EReject,EReject,EReject,EConsonant3,EReject,EReject,EReject,EZeroWidthJoinerMalaChilluNA2,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonantMalaChillu3,EConsonantMalaChilluNA3,EConsonant3},

   219 	{EReject,EReject,EReject,EConsonant4,EReject,EReject,EReject,EZeroWidthJoinerMalaChilluNA3,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant4,EConsonant4,EConsonant4},

   220 	{EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant2},

   221 	{EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant3},

   222 	{EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant4},

   223 	

   224 	// EAccept -- this one is added but anything further is rejected

   225 	{EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject}

   226 	};

   227 

   228 TIndicCodeType CodeType(TInt aCode, const TIndicCodeMapping aCodeMap[], TInt aMapLen)

   229 	{

   230 	TInt start = 0;

   231 	TInt end = aMapLen - 1;

   232 	while (start != end)

   233 		{

   234 		const TInt mid = (start + end + 1) >> 1;

   235 		if (aCodeMap[mid].iFirstCodeInRange <= aCode)

   236 			start = mid;

   237 		else

   238 			end = mid - 1;

   239 		}

   240 	return static_cast<TIndicCodeType>(aCodeMap[start].iCodeType);

   241 	}

   242 

   243 const TText16* SyllableEnd(const TText16* aCurrentPosition,

   244 	const TText16* aEnd, const TIndicCodeMapping aCodeMap[], TInt aMapLen)

   245 	{

   246 	TSyllableState state = EBegin;

   247 	while (aCurrentPosition != aEnd)

   248 		{

   249 		const TIndicCodeType ct = CodeType(*aCurrentPosition, aCodeMap, aMapLen);

   250 		state = KStateResponse[state][ct];

   251 		if (state == EReject)

   252 			return aCurrentPosition;

   253 		++aCurrentPosition;

   254 		}

   255 	return aCurrentPosition;

   256 	}

   257 

   258 /**

   259 Common function for all Indic scripts. 

   260 Performs the shaping operation on Indic script text up to KMaxTextToShape.

   261 */	

   262 TInt IndicShapingProcess(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo, 

   263 						const TIndicCodeMapping aCodeMap[], TInt aMapLen, const TUint aHighChar, 

   264 						const TUint aLowChar, const TUint32 aScript, const TUint32 aLang)

   265 	{

   266 	const TText16* startCharacter = aGss.iParam.iText.Ptr();

   267 	const TText16* endCharacter = startCharacter + aGss.iParam.iText.Length();

   268 	const TText16* currentCharacter = aGss.iText.CurrentPosition();

   269 	TInt currentPosition = currentCharacter - startCharacter;

   270 

   271 	// Do some new shaping

   272 	

   273 	// First close the existing RShapeInfo

   274 	if(aShapeInfo.IsOpen())

   275 		aShapeInfo.Close();

   276 	

   277 	// Find the end of Indic text whilst limiting the amount of text to be shaped to 

   278 	// KMaxTextToShape. When finding the end of end position of the text to be shaped,

   279 	// include numerals, punctuations and other control characters.

   280 	const TText16* endIndic = currentCharacter;

   281 	TChar endIndicChar = *endIndic;

   282 	while((endIndic <= endCharacter || endIndic - currentCharacter <= KMaxTextToShape) &&

   283 		 ((*endIndic >= aLowChar && *endIndic <= aHighChar) || 

   284 		 	((endIndicChar.IsDigit() || endIndicChar.IsPunctuation()) && !QuoteOrBracketPair(*endIndic))))

   285 		{

   286 		if (endIndic == endCharacter || endIndic - currentCharacter > KMaxTextToShape)

   287 			break;

   288 		endIndic = SyllableEnd(endIndic, endCharacter, aCodeMap, aMapLen);	

   289 		endIndicChar = *endIndic;

   290 		}

   291 	

   292 	TInt endPosForShaping = endIndic - startCharacter;

   293 	

   294 	//Now shape from current position to the end of Hindi

   295 	return aShapeInfo.Open(aGss.iFont, aGss.iParam.iText,

   296 						currentPosition, endPosForShaping, aScript, aLang);

   297 	}

   298 

   299 /**

   300 Common function for all Indic scripts. Adds the shaped glyphs to the glyph cluster.

   301 This function is called regardless of whether shaping was done or skipped in this 

   302 iteration of the Default Process

   303 */

   304 TBool IndicPostShapingProcess(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo, 

   305 							TInt aCurrPos, TInt aSyllEndPos, const TText16* aSyllableEnd)

   306 	{

   307 	// Now get all the shaped values

   308 	// Get the number of glyphs, glyphs, positions and indices after shaping.

   309 	TInt numGlyphs = aShapeInfo.GlyphCount();

   310 	const TInt32* glyph = aShapeInfo.Glyphs();

   311 	const RShapeInfo::TPoint16* position = aShapeInfo.GlyphPositions();

   312 	const TInt16* indices = aShapeInfo.Indices();

   313 	TPoint origin;

   314 	

   315 	// Shift the indices and positions until the current poisition is reached. This done so that the 

   316 	// origin can be set back to the original co-ordinates at the start of this Hindi text

   317 	while (*indices < aCurrPos)

   318 		{

   319 		position++;

   320 		indices++;

   321 		}

   322 	// Set the origin back by subtracting the current position co-ordinates from the current pen position	

   323 	origin.iX = aGss.iParam.iPen.iX - position->iX;

   324 	origin.iY = aGss.iParam.iPen.iY - position->iY;

   325 	

   326 	// No re-initialise the indices and positions to start appending the glyphs to clusters from the beginning

   327 	indices = aShapeInfo.Indices();

   328 	position = aShapeInfo.GlyphPositions();

   329 	

   330 	// Now do some post shaping syllable chopping

   331 	for (TInt i = 0; i < numGlyphs; i++, glyph++, position++, indices++)

   332 		{

   333 		if(*indices >= aSyllEndPos)

   334 			break;

   335 		if(*indices >= aCurrPos && *indices < aSyllEndPos)

   336 			{

   337 			aGss.iParam.iPen.iX = origin.iX + position->iX;

   338 			aGss.iParam.iPen.iY = origin.iY + position->iY;

   339 			

   340 			//Just skip the non-existing glyph and continue handling other glyphs if AppendGlyphToCluster return false.

   341 			// The "continue" statement is for avoiding the potential risk of handling the non-existing glyph.

   342 			if (!aGss.AppendGlyphToCluster(0x80000000UL | *glyph))

   343 				continue;

   344 			}

   345 		}

   346 	

   347 	// We'll do pen advance ourselves, thanks.

   348 	aGss.iPen = TGlyphSelectionState::EPenAdvance_No;

   349 	aGss.iParam.iPen.iX = origin.iX + position->iX;

   350 	aGss.iParam.iPen.iY = origin.iY + position->iY;

   351 	aGss.iClusterState = TGlyphSelectionState::EGClusterComplete;

   352 	aGss.iText.SetCurrentPosition(aSyllableEnd);

   353 	return ETrue;

   354 	}

   355 

   356 /**

   357 Common function for all Indic scripts.

   358 Performs shaping and Rasterizing operation on Indic script text 

   359 */

   360 TBool DoProcess(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo, const TIndicScriptProcessorParameters& aScriptSpecificParameters){

   361 	const TText16* startCharacter = aGss.iParam.iText.Ptr();

   362 	const TText16* endCharacter = startCharacter + aGss.iParam.iText.Length();

   363 	const TText16* currentCharacter = aGss.iText.CurrentPosition();

   364 	TInt currentPosition = currentCharacter - startCharacter;

   365 		

   366 	// Get the logical end of the syllable from the input text. We will use this later to chop

   367 	// syllables from the glyph values we get.

   368 	const TText16* syllableEnd = SyllableEnd(currentCharacter, endCharacter, aScriptSpecificParameters.iCodeMap,

   369 			aScriptSpecificParameters.iMapLen);

   370 	TInt syllableEndPos = syllableEnd - startCharacter;

   371 			

   372 	TInt ret = KErrNone;

   373 	if(currentPosition >= aShapeInfo.EndOfShapedText())	

   374 		ret = IndicShapingProcess(aGss, aShapeInfo, aScriptSpecificParameters.iCodeMap, aScriptSpecificParameters.iMapLen, 

   375 				aScriptSpecificParameters.iUCHigh, aScriptSpecificParameters.iUCLow, aScriptSpecificParameters.iScriptCode, aScriptSpecificParameters.iLanguageCode);

   376 		

   377 	// If an RShapeInfo could not be opened, call the default process

   378 	if (ret != KErrNone)

   379 		return GlyphSelector_Default::Process(aGss, aShapeInfo);	

   380 	

   381 	// Now call the post shaping process to add glyphs to the glyph cluster

   382 	return IndicPostShapingProcess(aGss, aShapeInfo, currentPosition, syllableEndPos, syllableEnd);

   383 }

   384 

   385 /*************************************************** D E V A N A G A R I ***************************************************/

   386 TBool GlyphSelector_Devanagari::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)

   387 	{

   388 	return DoProcess(aGss, aShapeInfo, KIndicDevParameters);

   389 	}

   390 	

   391 /***************************************************** K A N N A D A ******************************************************/

   392 TBool GlyphSelector_Kannada::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)

   393 	{

   394 	return DoProcess(aGss, aShapeInfo, KIndicKanParameters);

   395 	}

   396 

   397 /***************************************************** G U J A R A T I ******************************************************/

   398 TBool GlyphSelector_Gujarati::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)

   399 	{

   400 	return DoProcess(aGss, aShapeInfo, KIndicGujParameters);

   401 	}

   402 

   403 /***************************************************** B E N G A L I ******************************************************/

   404 TBool GlyphSelector_Bengali::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)

   405 	{

   406 	return DoProcess(aGss, aShapeInfo, KIndicBenParameters);

   407 	}

   408 

   409 /***************************************************** T A M I L ******************************************************/

   410 TBool GlyphSelector_Tamil::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)

   411 	{

   412 	return DoProcess(aGss, aShapeInfo, KIndicTamParameters);

   413 	}

   414 

   415 /***************************************************** T E L U G U ******************************************************/

   416 TBool GlyphSelector_Telugu::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)

   417 	{

   418 	return DoProcess(aGss, aShapeInfo, KIndicTelParameters);

   419 	}

   420 

   421 /***************************************************** G U R M U K H I ******************************************************/

   422 TBool GlyphSelector_Gurmukhi::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)\

   423 	{

   424 	return DoProcess(aGss, aShapeInfo, KIndicGurParameters);

   425 	}

   426 

   427 /***************************************************** M A L A Y A L A M ******************************************************/

   428 TBool GlyphSelector_Malayalam::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)

   429 	{

   430 	return DoProcess(aGss, aShapeInfo, KIndicMalParameters);

   431 	}

   432