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1 // Copyright (c) 2005-2010 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 /** |
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17 @file |
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18 @internalComponent |
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19 */ |
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20 |
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21 //#include <gdi.h> |
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22 #include <DisplayMode.h> |
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23 #include "FontIndic.h" |
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24 //#include <textbase.h> |
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25 #include "GlyphSel.h" |
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26 #include "ShapeInfo.h" |
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27 #include "gdiinline.inl" |
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28 |
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29 // State machine for determining syllable boundaries. |
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30 // Key: D = Dependent vowel. V = Virama. N = Nukta |
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31 // I = Independent Vowel. S = Candrabindu/Anusvara/Visarga |
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32 // C = Consonant. J = zero-width joiner. X = Other |
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33 // A = Addak (double the following constant) |
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34 enum TSyllableState |
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35 { |
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36 EReject = -1, |
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37 // Begin + I: add and move to IndependentVowel |
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38 // Begin + C: add and move to Consonant |
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39 // Begin + V/N/D/S/J/X: add and close syllable |
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40 EBegin = 0, |
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41 // Consonant + D: add and move to ConsonantVowel |
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42 // Consonant + N: add |
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43 // Consonant + V: add and move to Virama |
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44 // Consonant + S: add and close syllable |
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45 // Consonant + C/I/J/X: close syllable |
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46 EConsonant = 1, |
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47 // Consonant2 + D: add and move to ConsonantVowel |
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48 // Consonant2 + N: add |
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49 // Consonant2 + V: add and move to Virama2 |
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50 // Consonant2 + S: add and close syllable |
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51 // Consonant2 + C/I/J/X: close syllable |
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52 EConsonant2 = 2, |
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53 // Consonant3 + D: add and move to ConsonantVowel |
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54 // Consonant3 + N: add |
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55 // Consonant3 + V: add and move to Virama3 |
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56 // Consonant3 + S: add and close syllable |
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57 // Consonant3 + C/I/J/X: close syllable |
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58 EConsonant3 = 3, |
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59 // Consonant + D: add and move to ConsonantVowel |
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60 // Consonant + N: add |
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61 // Consonant + V: add and close syllable |
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62 // Consonant + S: add and close syllable |
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63 // Consonant + C/I/J/X: close syllable |
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64 EConsonant4 = 4, |
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65 // IndependentVowel + S: add |
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66 // IndependentVowel + D/V/N/I/C/J/X: close syllable |
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67 EIndependentVowel = 5, |
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68 // Virama + C: add and move to Consonant |
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69 // Virama + J: add and close syllable |
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70 // Virama + N/V/D/I/S/X: close syllable |
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71 EVirama = 6, |
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72 // Virama2 + C: add and move to Consonant3 |
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73 // Virama2 + J: add and close syllable |
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74 // Virama2 + N/V/D/I/S/X: close syllable |
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75 EVirama2 = 7, |
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76 // Virama3 + C: add and move to Consonant4 |
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77 // Virama3 + J: add and close syllable |
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78 // Virama3 + N/V/D/I/S/X: close syllable |
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79 EVirama3 = 8, |
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80 // Virama4 + J: add and close syllable |
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81 // Virama4 + CN/V/D/I/S/X: close syllable |
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82 EVirama4 = 9, |
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83 // ConsonantVowel + S: add |
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84 // ConsonantVowel + D/V/N/I/C/J/X: close syllable |
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85 EConsonantVowel = 10, |
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86 // NuktaConsonant + D/V: add |
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87 // NuktaConsonant + S/N/I/C/J/X: close syllable |
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88 ENuktaConsonant = 11, |
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89 // NuktaConsonant + D/V: add |
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90 // NuktaConsonant + S/N/I/C/J/X: close syllable |
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91 ENuktaConsonant2 = 12, |
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92 // NuktaConsonant + D/V: add |
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93 // NuktaConsonant + S/N/I/C/J/X: close syllable |
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94 ENuktaConsonant3 = 13, |
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95 // NuktaConsonant + D: add |
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96 // NuktaConsonant + V/S/N/I/C/J/X: close syllable |
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97 ENuktaConsonant4 = 14, |
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98 // IndependentVowelA + CANDRA E: add |
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99 // IndependentVowelA + anything else: close syllable |
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100 EIndependentVowelA = 15, |
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101 // ZeroWidthJoinerC + V: add |
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102 // ZeroWidthJoinerC + C/S/N/I/J/X/D: close syllable |
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103 EZeroWidthJoinerC = 16, |
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104 // ZeroWidthJoinerA + CANDRA E: add |
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105 // ZeroWidthJoinerA +anything else: close syllable |
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106 EZeroWidthJoinerA = 17, |
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107 // ZeroWidthJoinerV + C/N: add |
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108 // ZeroWidthJoinerV + anything else: close syllable |
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109 EZeroWidthJoinerV = 18, |
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110 // ZeroWidthJoinerV2 + C/N: add |
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111 // ZeroWidthJoinerV2 + anything else: close syllable |
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112 EZeroWidthJoinerV2 = 19, |
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113 // ZeroWidthJoinerV3 + C/N: add |
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114 // ZeroWidthJoinerV3 + anything else: close syllable |
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115 EZeroWidthJoinerV3 =20, |
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116 // EKannadaRa + C/N/V/ZWJ(C): add |
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117 EKannadaRa = 21, |
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118 // ESplitVowel1 + SV2: add and close syllable |
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119 // ESPlitVowel1 + anything else: close syllable |
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120 ESplitVowel1 = 22, |
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121 //EGurBearerA + EIndicCodeGurDependentVowelA: add and move to EIndependentVowel |
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122 //EGurBearerA + modifier: add and close syllable |
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123 //EGurBearerA + anything else: close syllable |
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124 EGurBearerA = 23, |
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125 //EGurBearerU + EIndicCodeGurDependentVowelU: add and move to EIndependentVowel |
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126 //EGurBearerU + anything else: close syllable |
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127 EGurBearerU = 24, |
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128 //EGurBearerI + EIndicCodeGurDependentVowelI: add and move to EIndependentVowel |
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129 //EGurBearerI + anything else: close syllable |
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130 EGurBearerI = 25, |
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131 |
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132 EConsonantMalaChillu = 26, |
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133 EConsonantMalaChillu2 = 27, |
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134 EConsonantMalaChillu3 = 28, |
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135 EViramaMalaChillu = 29, |
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136 EViramaMalaChillu2 = 30, |
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137 EViramaMalaChillu3 = 31, |
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138 EConsonantMalaChilluNA = 32, |
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139 EConsonantMalaChilluNA2 = 33, |
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140 EConsonantMalaChilluNA3 = 34, |
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141 EViramaMalaChilluNA = 35, |
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142 EViramaMalaChilluNA2 = 36, |
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143 EViramaMalaChilluNA3 = 37, |
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144 EZeroWidthJoinerMalaChilluNA = 38, |
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145 EZeroWidthJoinerMalaChilluNA2 = 39, |
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146 EZeroWidthJoinerMalaChilluNA3 = 40, |
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147 // Add and close acceptances go here. |
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148 EAccept = 41 |
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149 }; |
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150 |
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151 /** Defines the transitions for a state machine for determining syllable |
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152 boundaries. The machine starts in state 0. On receiving a character of type t |
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153 while in state s, moves to state KStateResponse[s][t]. */ |
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154 const TSyllableState KStateResponse[42][24] = |
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155 { |
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156 // EBegin -- nothing added yet |
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157 {EAccept, EAccept, EIndependentVowel, EConsonant, EAccept, EAccept, EAccept, EAccept, ENuktaConsonant, EIndependentVowelA, EAccept, EKannadaRa, EAccept, EAccept, EAccept, EGurBearerA, EGurBearerU, EGurBearerI, EAccept, EAccept, EAccept, EConsonantMalaChillu,EConsonantMalaChilluNA,EConsonant}, |
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158 // EConsonant -- seen a consonant either at the start or after virama |
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159 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama, ENuktaConsonant, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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160 // EConsonant2 -- seen a consonant after virama |
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161 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama2, ENuktaConsonant2, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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162 // EConsonant3 -- seen a consonant after virama2 |
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163 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama3, ENuktaConsonant3, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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164 // EConsonant4 -- seen a consonant after virama3 |
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165 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama4, ENuktaConsonant4, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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166 // EIndependentVowel -- possibly nasalized. I haven't bothered to distinguish between |
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167 // nasalization and visarga. |
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168 {EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject}, |
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169 // EVirama -- just seen a virama in a legal context. Must be consonant or ZWJ next |
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170 {EReject, EReject, EReject, EConsonant2, EReject, EReject, EReject, EZeroWidthJoinerV, ENuktaConsonant2, EReject, EReject, EConsonant2, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantMalaChillu2,EConsonantMalaChilluNA2,EConsonant2}, |
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171 // EVirama2 -- just seen a virama in a legal context. Must be consonant2 |
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172 {EReject, EReject, EReject, EConsonant3, EReject, EReject, EReject, EZeroWidthJoinerV2, ENuktaConsonant3, EReject, EReject, EConsonant3, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantMalaChillu3,EConsonantMalaChilluNA3,EConsonant3}, |
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173 // EVirama3 -- just seen a virama in a legal context. Must be consonant3 |
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174 {EReject, EReject, EReject, EConsonant4, EReject, EReject, EReject, EZeroWidthJoinerV3, ENuktaConsonant4, EReject, EReject, EConsonant4, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonant4,EConsonant4,EConsonant4}, |
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175 // EVirama4 -- just seen a virama in a legal context. Must be consonant4 |
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176 {EReject, EReject, EReject, EReject, EReject, EReject, EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject}, |
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177 // EConsonantVowel -- Just seen a consonant with matra. Can only nasalize or visarg |
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178 {EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject}, |
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179 // ENuktaConsonant -- Just seen a consonant with Nukta. Can only accept a dependant vowel or a Virama at this stage. |
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180 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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181 // ENuktaConsonant2 -- Just seen a consonant with Nukta after a virama. |
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182 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama2, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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183 // ENuktaConsonant3 -- Just seen a consonant with Nukta after Virama2. |
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184 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama3, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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185 // ENuktaConsonant4 -- Just seen a consonant with Nukta after Virama3. |
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186 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama4, EReject, EReject, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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187 // EIndependentVowelA -- Special case Devanagari independent vowel |
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188 {EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EZeroWidthJoinerA, EReject, EReject, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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189 // EZeroWidthJoinerC -- Just seen a ZWJ after a consonant |
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190 {EReject, EReject, EReject, EReject, EReject, EVirama, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject}, |
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191 // EZeroWidthJoinerA -- Just seen a ZWJ after the dependent Vowel A |
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192 {EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject}, |
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193 // EZeroWidthJoinerV -- Just seen the ZWJ after the first pair of consonant + virama |
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194 {EReject, EAccept, EReject, EConsonant2, EReject, EReject, EReject, EReject, ENuktaConsonant2, EReject, EReject, EConsonant2, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantMalaChillu2,EConsonantMalaChilluNA2,EConsonant2}, |
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195 // EZeroWidthJoinerV2 -- Just seen the ZWJ after consonant + virama + consonant + virama |
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196 {EReject, EAccept, EReject, EConsonant3, EReject, EReject, EReject, EReject, ENuktaConsonant3, EReject, EReject, EConsonant3, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantMalaChillu3,EConsonantMalaChilluNA3,EConsonant3}, |
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197 // EZeroWidthJoinerV3 -- Just seen the ZWJ after consonant + virama + consonant + virama + consonant + virama |
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198 {EReject, EAccept, EReject, EConsonant4, EReject, EReject, EReject, EReject, ENuktaConsonant4, EReject, EReject, EConsonant4, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonant4,EConsonant4,EConsonant4}, |
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199 // EKannadaRa -- Special case consonant |
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200 {EReject, EAccept, EReject, EReject, EConsonantVowel, EVirama, ENuktaConsonant, EZeroWidthJoinerC, EReject, EReject, EConsonantVowel, EReject, ESplitVowel1, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EConsonantVowel, EReject,EReject,EReject}, |
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201 // ESplitVowel1 -- Just seen a consonant with first part of a split vowel. Can only nasalize, visarg or add second part of splt vowel |
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202 {EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EConsonantVowel, EConsonantVowel, EReject, EReject, EReject, EReject, EReject, EReject, EReject,EReject,EReject}, |
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203 // EGurBearerA -- Just seen a dependent Vowel EIndicCodeGurDependentVowelA and modifier |
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204 {EReject, EAccept, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EIndependentVowel, EReject, EReject, EReject,EReject,EReject}, |
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205 // EGurBearerU -- Just seen a dependent Vowel EIndicCodeGurDependentVowelU |
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206 {EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EIndependentVowel, EReject, EReject,EReject,EReject}, |
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207 // EGurBearerI -- Just seen a dependent Vowel EIndicCodeGurDependentVowelI |
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208 {EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EIndependentVowel, EReject,EReject,EReject}, |
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209 |
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210 {EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChillu,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject}, |
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211 {EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChillu2,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject}, |
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212 {EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChillu3,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject}, |
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213 {EReject,EReject,EReject,EConsonant2,EReject,EReject,EReject,EAccept,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonantMalaChillu2,EConsonantMalaChilluNA2,EConsonant2}, |
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214 {EReject,EReject,EReject,EConsonant3,EReject,EReject,EReject,EAccept,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonantMalaChillu3,EConsonantMalaChilluNA3,EConsonant3}, |
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215 {EReject,EReject,EReject,EConsonant4,EReject,EReject,EReject,EAccept,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant4,EConsonant4,EConsonant4}, |
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216 {EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChilluNA,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject}, |
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217 {EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChilluNA2,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject}, |
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218 {EReject,EAccept,EReject,EReject,EConsonantVowel,EViramaMalaChilluNA3,EReject,EReject,EReject,EReject,EReject,EReject,ESplitVowel1,EConsonantVowel,EConsonantVowel,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject}, |
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219 {EReject,EReject,EReject,EConsonant2,EReject,EReject,EReject,EZeroWidthJoinerMalaChilluNA,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonantMalaChillu2,EConsonantMalaChilluNA2,EConsonant2}, |
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220 {EReject,EReject,EReject,EConsonant3,EReject,EReject,EReject,EZeroWidthJoinerMalaChilluNA2,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonantMalaChillu3,EConsonantMalaChilluNA3,EConsonant3}, |
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221 {EReject,EReject,EReject,EConsonant4,EReject,EReject,EReject,EZeroWidthJoinerMalaChilluNA3,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant4,EConsonant4,EConsonant4}, |
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222 {EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant2}, |
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223 {EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant3}, |
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224 {EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EReject,EConsonant4}, |
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225 |
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226 // EAccept -- this one is added but anything further is rejected |
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227 {EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject, EReject} |
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228 }; |
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229 |
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230 TIndicCodeType CodeType(TInt aCode, const TIndicCodeMapping aCodeMap[], TInt aMapLen) |
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231 { |
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232 TInt start = 0; |
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233 TInt end = aMapLen - 1; |
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234 while (start != end) |
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235 { |
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236 const TInt mid = (start + end + 1) >> 1; |
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237 if (aCodeMap[mid].iFirstCodeInRange <= aCode) |
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238 start = mid; |
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239 else |
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240 end = mid - 1; |
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241 } |
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242 return static_cast<TIndicCodeType>(aCodeMap[start].iCodeType); |
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243 } |
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244 |
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245 const TText16* SyllableEnd(const TText16* aCurrentPosition, |
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246 const TText16* aEnd, const TIndicCodeMapping aCodeMap[], TInt aMapLen) |
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247 { |
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248 TSyllableState state = EBegin; |
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249 while (aCurrentPosition != aEnd) |
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250 { |
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251 const TIndicCodeType ct = CodeType(*aCurrentPosition, aCodeMap, aMapLen); |
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252 state = KStateResponse[state][ct]; |
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253 if (state == EReject) |
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254 return aCurrentPosition; |
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255 ++aCurrentPosition; |
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256 } |
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257 return aCurrentPosition; |
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258 } |
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259 |
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260 /** |
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261 Common function for all Indic scripts. |
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262 Performs the shaping operation on Indic script text up to KMaxTextToShape. |
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263 */ |
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264 TInt IndicShapingProcess(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo, |
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265 const TIndicCodeMapping aCodeMap[], TInt aMapLen, const TUint aHighChar, |
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266 const TUint aLowChar, const TUint32 aScript, const TUint32 aLang) |
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267 { |
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268 const TText16* startCharacter = aGss.iParam.iText.Ptr(); |
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269 const TText16* endCharacter = startCharacter + aGss.iParam.iText.Length(); |
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270 const TText16* currentCharacter = aGss.iText.CurrentPosition(); |
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271 TInt currentPosition = currentCharacter - startCharacter; |
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272 |
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273 // Do some new shaping |
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274 |
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275 // First close the existing RShapeInfo |
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276 if(aShapeInfo.IsOpen()) |
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277 aShapeInfo.Close(); |
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278 |
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279 // Find the end of Indic text whilst limiting the amount of text to be shaped to |
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280 // KMaxTextToShape. When finding the end of end position of the text to be shaped, |
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281 // include numerals, punctuations and other control characters. |
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282 const TText16* endIndic = currentCharacter; |
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283 TChar endIndicChar = *endIndic; |
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284 while((endIndic <= endCharacter || endIndic - currentCharacter <= KMaxTextToShape) && |
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285 ((*endIndic >= aLowChar && *endIndic <= aHighChar) || |
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286 ((endIndicChar.IsDigit() || endIndicChar.IsPunctuation()) && !QuoteOrBracketPair(*endIndic)))) |
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287 { |
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288 if (endIndic == endCharacter || endIndic - currentCharacter > KMaxTextToShape) |
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289 break; |
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290 endIndic = SyllableEnd(endIndic, endCharacter, aCodeMap, aMapLen); |
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291 endIndicChar = *endIndic; |
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292 } |
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293 |
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294 TInt endPosForShaping = endIndic - startCharacter; |
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295 |
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296 //Now shape from current position to the end of Hindi |
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297 return aShapeInfo.Open(aGss.iFont, aGss.iParam.iText, |
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298 currentPosition, endPosForShaping, aScript, aLang); |
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299 } |
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300 |
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301 /** |
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302 Common function for all Indic scripts. Adds the shaped glyphs to the glyph cluster. |
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303 This function is called regardless of whether shaping was done or skipped in this |
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304 iteration of the Default Process |
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305 */ |
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306 TBool IndicPostShapingProcess(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo, |
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307 TInt aCurrPos, TInt aSyllEndPos, const TText16* aSyllableEnd) |
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308 { |
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309 // Now get all the shaped values |
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310 // Get the number of glyphs, glyphs, positions and indices after shaping. |
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311 TInt numGlyphs = aShapeInfo.GlyphCount(); |
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312 const TInt32* glyph = aShapeInfo.Glyphs(); |
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313 const RShapeInfo::TPoint16* position = aShapeInfo.GlyphPositions(); |
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314 const TInt16* indices = aShapeInfo.Indices(); |
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315 TPoint origin; |
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316 |
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317 // Shift the indices and positions until the current poisition is reached. This done so that the |
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318 // origin can be set back to the original co-ordinates at the start of this Hindi text |
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319 while (*indices < aCurrPos) |
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320 { |
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321 position++; |
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322 indices++; |
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323 } |
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324 // Set the origin back by subtracting the current position co-ordinates from the current pen position |
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325 origin.iX = aGss.iParam.iPen.iX - position->iX; |
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326 origin.iY = aGss.iParam.iPen.iY - position->iY; |
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327 |
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328 // No re-initialise the indices and positions to start appending the glyphs to clusters from the beginning |
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329 indices = aShapeInfo.Indices(); |
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330 position = aShapeInfo.GlyphPositions(); |
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331 |
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332 // Now do some post shaping syllable chopping |
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333 for (TInt i = 0; i < numGlyphs; i++, glyph++, position++, indices++) |
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334 { |
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335 if(*indices >= aSyllEndPos) |
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336 break; |
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337 if(*indices >= aCurrPos && *indices < aSyllEndPos) |
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338 { |
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339 aGss.iParam.iPen.iX = origin.iX + position->iX; |
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340 aGss.iParam.iPen.iY = origin.iY + position->iY; |
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341 |
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342 //Just skip the non-existing glyph and continue handling other glyphs if AppendGlyphToCluster return false. |
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343 // The "continue" statement is for avoiding the potential risk of handling the non-existing glyph. |
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344 if (!aGss.AppendGlyphToCluster(0x80000000UL | *glyph)) |
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345 continue; |
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346 } |
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347 } |
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348 |
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349 // We'll do pen advance ourselves, thanks. |
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350 aGss.iPen = TGlyphSelectionState::EPenAdvance_No; |
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351 aGss.iParam.iPen.iX = origin.iX + position->iX; |
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352 aGss.iParam.iPen.iY = origin.iY + position->iY; |
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353 aGss.iClusterState = TGlyphSelectionState::EGClusterComplete; |
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354 aGss.iText.SetCurrentPosition(aSyllableEnd); |
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355 return ETrue; |
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356 } |
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357 |
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358 /** |
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359 Common function for all Indic scripts. |
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360 Performs shaping and Rasterizing operation on Indic script text |
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361 */ |
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362 TBool DoProcess(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo, const TIndicScriptProcessorParameters& aScriptSpecificParameters){ |
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363 const TText16* startCharacter = aGss.iParam.iText.Ptr(); |
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364 const TText16* endCharacter = startCharacter + aGss.iParam.iText.Length(); |
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365 const TText16* currentCharacter = aGss.iText.CurrentPosition(); |
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366 TInt currentPosition = currentCharacter - startCharacter; |
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367 |
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368 // Get the logical end of the syllable from the input text. We will use this later to chop |
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369 // syllables from the glyph values we get. |
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370 const TText16* syllableEnd = SyllableEnd(currentCharacter, endCharacter, aScriptSpecificParameters.iCodeMap, |
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371 aScriptSpecificParameters.iMapLen); |
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372 TInt syllableEndPos = syllableEnd - startCharacter; |
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373 |
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374 TInt ret = KErrNone; |
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375 if(currentPosition >= aShapeInfo.EndOfShapedText()) |
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376 ret = IndicShapingProcess(aGss, aShapeInfo, aScriptSpecificParameters.iCodeMap, aScriptSpecificParameters.iMapLen, |
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377 aScriptSpecificParameters.iUCHigh, aScriptSpecificParameters.iUCLow, aScriptSpecificParameters.iScriptCode, aScriptSpecificParameters.iLanguageCode); |
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378 |
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379 // If an RShapeInfo could not be opened, call the default process |
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380 if (ret != KErrNone) |
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381 return GlyphSelector_Default::Process(aGss, aShapeInfo); |
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382 |
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383 // Now call the post shaping process to add glyphs to the glyph cluster |
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384 return IndicPostShapingProcess(aGss, aShapeInfo, currentPosition, syllableEndPos, syllableEnd); |
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385 } |
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386 |
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387 /*************************************************** D E V A N A G A R I ***************************************************/ |
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388 TBool GlyphSelector_Devanagari::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo) |
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389 { |
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390 return DoProcess(aGss, aShapeInfo, KIndicDevParameters); |
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391 } |
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392 |
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393 /***************************************************** K A N N A D A ******************************************************/ |
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394 TBool GlyphSelector_Kannada::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo) |
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395 { |
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396 return DoProcess(aGss, aShapeInfo, KIndicKanParameters); |
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397 } |
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398 |
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399 /***************************************************** G U J A R A T I ******************************************************/ |
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400 TBool GlyphSelector_Gujarati::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo) |
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401 { |
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402 return DoProcess(aGss, aShapeInfo, KIndicGujParameters); |
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403 } |
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404 |
|
405 /***************************************************** B E N G A L I ******************************************************/ |
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406 TBool GlyphSelector_Bengali::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo) |
|
407 { |
|
408 return DoProcess(aGss, aShapeInfo, KIndicBenParameters); |
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409 } |
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410 |
|
411 /***************************************************** T A M I L ******************************************************/ |
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412 TBool GlyphSelector_Tamil::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo) |
|
413 { |
|
414 return DoProcess(aGss, aShapeInfo, KIndicTamParameters); |
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415 } |
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416 |
|
417 /***************************************************** T E L U G U ******************************************************/ |
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418 TBool GlyphSelector_Telugu::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo) |
|
419 { |
|
420 return DoProcess(aGss, aShapeInfo, KIndicTelParameters); |
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421 } |
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422 |
|
423 /***************************************************** G U R M U K H I ******************************************************/ |
|
424 TBool GlyphSelector_Gurmukhi::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo)\ |
|
425 { |
|
426 return DoProcess(aGss, aShapeInfo, KIndicGurParameters); |
|
427 } |
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428 |
|
429 /***************************************************** M A L A Y A L A M ******************************************************/ |
|
430 TBool GlyphSelector_Malayalam::Process(TGlyphSelectionState& aGss, RShapeInfo& aShapeInfo) |
|
431 { |
|
432 return DoProcess(aGss, aShapeInfo, KIndicMalParameters); |
|
433 } |
|
434 |