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1 // Copyright (c) 2003-2010 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 |
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22 //#include <textbase.h> |
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23 #include <gdi.h> |
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24 #include "FontThai.h" |
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25 |
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26 |
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27 // |
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28 // ThaiGlyph Namespace definition |
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29 // |
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30 |
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31 |
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32 /** |
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33 This namespace holds functions used to evaluate a glyph character code |
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34 against a given Thai related prediciate. The 'code' argument is a glyph |
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35 from the current output cluster and so may be a Thai glyph, Thai PUA glyph, |
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36 the dotted circle glyph or 0xffff. Therefore it was decided not to implement |
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37 these routines using a data driven table approach as it would be inefficient. |
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38 @internalComponent. |
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39 */ |
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40 namespace ThaiGlyph |
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41 { |
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42 const TText16 KYoYing = 0x0E0D; |
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43 const TText16 KYoYingPua = 0xF70F; |
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44 const TText16 KThoThan = 0x0E10; |
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45 const TText16 KThoThanPua = 0xF700; |
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46 const TText16 KNikhahit = 0x0E4D; |
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47 const TText16 KNikhahitPua = 0xF711; |
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48 const TText16 KSaraAa = 0x0E32; |
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49 const TText16 KSaraAm = 0x0E33; |
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50 |
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51 |
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52 TBool IsThaiGlyph(TUint code) |
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53 { |
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54 return ((code > 0x0E00 && code < 0x0E3B) || |
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55 (code > 0x0E3E && code < 0x0E5C) || |
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56 (code >= 0xF700 && code <= 0xF71A)); |
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57 } |
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58 |
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59 TBool IsThaiConsonant(TUint code) |
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60 { |
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61 return (code >= 0x0E01 && code <= 0x0E2E); |
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62 } |
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63 |
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64 TBool IsThaiTallConsonant(TUint code) |
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65 { |
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66 return (//code == 0x0E0A || // CHO CHANG not tall at all |
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67 //code == 0x0E0B || // SO SO not tall at all |
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68 code == 0x0E1B || // PO PLA |
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69 code == 0x0E1D || // FO FA |
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70 code == 0x0E1F || // FO FAN |
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71 code == 0x0E2C); // LO CHULA in some fonts, Unicode tables show it as tall |
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72 } |
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73 |
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74 TBool IsThaiShortConsonant(TUint code) |
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75 { |
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76 return (((code >= 0x0E01 && code <= 0x0E2E) || (code == KUnicodeDottedCircle)) && |
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77 code != 0x0E1B && // PO PLA |
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78 code != 0x0E1D && // FO FA |
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79 code != 0x0E1F && // FO FAN |
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80 code != 0x0E2C); // LO CHULA in some fonts, Unicode tables show it as tall |
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81 } |
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82 |
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83 TBool IsThaiConsonantWithDisjointDescender(TUint code) |
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84 { |
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85 return (code == ThaiGlyph::KYoYing || code == ThaiGlyph::KThoThan); |
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86 } |
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87 |
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88 TBool IsThaiConsonantWithJointDescender(TUint code) |
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89 { |
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90 return (code == 0x0E0E || // DO CHADA |
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91 code == 0x0E0F || // PO PATAK |
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92 code == 0x0E24 || // RU |
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93 code == 0x0E26); // LU |
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94 } |
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95 |
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96 TBool IsThaiVowel(TUint code) |
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97 { |
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98 return ((code >= 0x0E30 && code <= 0x0E3A) || |
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99 (code >= 0x0E40 && code <= 0x0E44) || |
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100 code == 0x0E47); // MAITAIKHU |
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101 } |
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102 |
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103 TBool IsThaiDepVowel(TUint code) |
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104 { |
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105 return (code == 0x0E31 || // MAI HAN-AKAT |
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106 (code >= 0x0E34 && code <= 0x0E3A) || |
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107 code == 0x0E47); // MAITAIKHU |
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108 } |
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109 |
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110 TBool IsThaiDepVowelAbove(TUint code) |
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111 { |
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112 return (code == 0x0E31 || // MAI HAN-AKAT |
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113 (code >= 0x0E34 && code <= 0x0E37) || |
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114 code == 0x0E47); // MAITAIKHU |
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115 } |
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116 |
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117 TBool IsThaiDepVowelAbovePUA(TUint code) |
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118 { |
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119 return (code == 0xF710 || // MAI HAN-AKAT |
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120 (code >= 0xF701 && code <= 0xF704) || |
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121 code == 0xF712); // MAITAIKHU |
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122 } |
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123 |
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124 TBool IsThaiDepVowelBelow(TUint code) |
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125 { |
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126 return (code >= 0x0E38 && code <= 0x0E3A); |
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127 } |
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128 |
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129 TBool IsThaiIndepVowel(TUint code) |
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130 { |
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131 return (code == 0x0E30 || // SARA A |
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132 code == 0x0E32 || // SARA AA |
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133 code == 0x0E33 || // SARA AM |
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134 (code >= 0x0E40 && code <= 0x0E44)); |
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135 } |
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136 |
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137 TBool IsThaiToneMark(TUint code) |
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138 { |
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139 return (code >= 0x0E48 && code <= 0x0E4B); |
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140 } |
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141 } |
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142 |
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143 |
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144 // |
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145 // |
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146 // ThaiCharRules Namespace definition |
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147 // |
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148 // |
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149 |
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150 |
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151 /** |
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152 ThaiCharRules namespace holds the data and lookup methods |
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153 implementing the WTT 2.0 input/output validation matrix. |
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154 @internalComponent |
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155 */ |
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156 namespace ThaiCharRules |
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157 { |
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158 const TUint KThaiCodePageStart = 0x0E00; |
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159 const TUint KThaiCodePageEnd = 0x0E5C; |
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160 const TUint KNumThaiCharacters = KThaiCodePageEnd-KThaiCodePageStart; |
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161 |
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162 enum Wtt2Rule |
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163 { |
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164 EUndefined, |
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165 EAccept, |
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166 EComposite, |
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167 EReject, |
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168 ERejectStrict, |
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169 }; |
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170 |
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171 /** |
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172 This enumeration holds the set of classification values a Thai |
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173 character can be categorised as in the WTT2.0 specification. |
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174 */ |
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175 enum CharClassification |
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176 { |
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177 ENull, |
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178 EControl, |
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179 ENonPrintable, |
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180 EConsonant, |
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181 ELeadingVowel, |
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182 EOrdinaryFollowingVowel, |
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183 EDependentFollowingVowel, |
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184 ESpecialFollowingVowel, |
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185 EShortBelowVowel, |
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186 ELongBelowVowel, |
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187 EBelowDiacritic, |
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188 EToneMark, |
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189 EAboveDiacritic0, |
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190 EAboveDiacritic1, |
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191 EAboveDiacritic2, |
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192 EAboveDiacritic3, |
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193 EAboveVowel1, |
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194 EAboveVowel2, |
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195 EAboveVowel3, |
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196 // marker for end |
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197 EMaxClassification |
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198 }; |
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199 |
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200 |
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201 /** |
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202 Data table holding the classification of each character. |
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203 */ |
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204 static const TUint8 iCharClassifications[KNumThaiCharacters] = |
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205 { |
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206 ENull, // No entry in code page |
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207 EConsonant, // 0x0E01 |
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208 EConsonant, // 0x0E02 |
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209 EConsonant, // 0x0E03 |
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210 EConsonant, // 0x0E04 |
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211 EConsonant, // 0x0E05 |
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212 EConsonant, // 0x0E06 |
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213 EConsonant, // 0x0E07 |
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214 EConsonant, // 0x0E08 |
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215 EConsonant, // 0x0E09 |
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216 EConsonant, // 0x0E0A |
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217 EConsonant, // 0x0E0B |
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218 EConsonant, // 0x0E0C |
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219 EConsonant, // 0x0E0D |
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220 EConsonant, // 0x0E0E |
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221 EConsonant, // 0x0E0F |
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222 |
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223 EConsonant, // 0x0E10 |
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224 EConsonant, // 0x0E11 |
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225 EConsonant, // 0x0E12 |
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226 EConsonant, // 0x0E13 |
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227 EConsonant, // 0x0E14 |
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228 EConsonant, // 0x0E15 |
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229 EConsonant, // 0x0E16 |
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230 EConsonant, // 0x0E17 |
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231 EConsonant, // 0x0E18 |
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232 EConsonant, // 0x0E19 |
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233 EConsonant, // 0x0E1A |
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234 EConsonant, // 0x0E1B |
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235 EConsonant, // 0x0E1C |
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236 EConsonant, // 0x0E1D |
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237 EConsonant, // 0x0E1E |
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238 EConsonant, // 0x0E1F |
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239 |
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240 EConsonant, // 0x0E20 |
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241 EConsonant, // 0x0E21 |
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242 EConsonant, // 0x0E22 |
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243 EConsonant, // 0x0E23 |
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244 EConsonant, // 0x0E24 |
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245 EConsonant, // 0x0E25 |
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246 EConsonant, // 0x0E26 |
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247 EConsonant, // 0x0E27 |
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248 EConsonant, // 0x0E28 |
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249 EConsonant, // 0x0E29 |
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250 EConsonant, // 0x0E2A |
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251 EConsonant, // 0x0E2B |
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252 EConsonant, // 0x0E2C |
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253 EConsonant, // 0x0E2D |
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254 EConsonant, // 0x0E2E |
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255 ENonPrintable, // 0x0E2F |
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256 |
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257 EOrdinaryFollowingVowel,// 0x0E30 |
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258 EAboveVowel2, // 0x0E31 |
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259 EOrdinaryFollowingVowel,// 0x0E32 |
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260 EOrdinaryFollowingVowel,// 0x0E33 |
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261 EAboveVowel1, // 0x0E34 |
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262 EAboveVowel3, // 0x0E35 |
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263 EAboveVowel2, // 0x0E36 |
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264 EAboveVowel3, // 0x0E37 |
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265 EShortBelowVowel, // 0x0E38 |
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266 ELongBelowVowel, // 0x0E39 |
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267 EBelowDiacritic, // 0x0E3A |
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268 ENull, // 0x0E3B |
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269 ENull, // 0x0E3C |
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270 ENull, // 0x0E3D |
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271 ENull, // 0x0E3E |
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272 ENonPrintable, // 0x0E3F |
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273 |
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274 ELeadingVowel, // 0x0E40 |
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275 ELeadingVowel, // 0x0E41 |
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276 ELeadingVowel, // 0x0E42 |
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277 ELeadingVowel, // 0x0E43 |
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278 ELeadingVowel, // 0x0E44 |
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279 EDependentFollowingVowel,//0x0E45 |
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280 ENonPrintable, // 0x0E46 |
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281 EAboveDiacritic2, // 0x0E47 |
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282 EToneMark, // 0x0E48 |
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283 EToneMark, // 0x0E49 |
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284 EToneMark, // 0x0E4A |
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285 EToneMark, // 0x0E4B |
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286 EAboveDiacritic1, // 0x0E4C |
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287 EAboveDiacritic0, // 0x0E4D |
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288 EAboveDiacritic3, // 0x0E4E |
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289 ENonPrintable, // 0x0E4F |
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290 |
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291 ENonPrintable, // 0x0E50 |
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292 ENonPrintable, // 0x0E51 |
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293 ENonPrintable, // 0x0E52 |
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294 ENonPrintable, // 0x0E53 |
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295 ENonPrintable, // 0x0E54 |
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296 ENonPrintable, // 0x0E55 |
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297 ENonPrintable, // 0x0E56 |
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298 ENonPrintable, // 0x0E57 |
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299 ENonPrintable, // 0x0E58 |
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300 ENonPrintable, // 0x0E59 |
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301 ENonPrintable, // 0x0E5A |
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302 ENonPrintable, // 0x0E5B |
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303 |
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304 // Value at last measurement was 92 bytes. 27/6/2003 |
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305 }; |
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306 |
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307 |
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308 /** |
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309 WTT 2.0 Rules data table of prev to next character |
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310 */ |
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311 static const TUint8 iInputRules[EMaxClassification][EMaxClassification] = |
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312 { |
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313 /* Previous character ENull */ |
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314 { |
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315 EUndefined, EUndefined, EUndefined, EUndefined, EUndefined, |
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316 EUndefined, EUndefined, EUndefined, EUndefined, EUndefined, |
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317 EUndefined, EUndefined, EUndefined, EUndefined, EUndefined, |
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318 EUndefined, EUndefined, EUndefined, EUndefined |
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319 }, |
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320 |
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321 /* Previous character EControl */ |
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322 { |
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323 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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324 EAccept, EAccept, EAccept, EReject, EReject, |
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325 EReject, EReject, EReject, EReject, EReject, EReject, |
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326 EReject, EReject, EReject, |
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327 }, |
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328 |
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329 /* Previous character ENonPrintable */ |
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330 { |
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331 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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332 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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333 EReject, EReject, EReject, EReject, EReject, EReject, |
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334 EReject, EReject, EReject, |
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335 }, |
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336 |
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337 /* Previous character EConsonant */ |
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338 { |
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339 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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340 EAccept, ERejectStrict, EAccept, EComposite, EComposite, |
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341 EComposite, EComposite, EComposite, EComposite, EComposite, EComposite, |
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342 EComposite, EComposite, EComposite, |
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343 }, |
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344 |
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345 /* Previous character ELeadingVowel */ |
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346 { |
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347 EUndefined, EUndefined, ERejectStrict, EAccept, ERejectStrict, |
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348 ERejectStrict, ERejectStrict, ERejectStrict, EReject, EReject, |
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349 EReject, EReject, EReject, EReject, EReject, EReject, |
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350 EReject, EReject, EReject, |
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351 }, |
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352 |
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353 /* Previous character EOrdinaryFollowingVowel */ |
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354 { |
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355 EUndefined, EUndefined, ERejectStrict, EAccept, ERejectStrict, |
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356 EAccept, ERejectStrict, EAccept, EReject, EReject, |
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357 EReject, EReject, EReject, EReject, EReject, EReject, |
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358 EReject, EReject, EReject, |
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359 }, |
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360 |
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361 /* Previous character EDependentFollowingVowel */ |
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362 { |
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363 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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364 EAccept, ERejectStrict, EAccept, EReject, EReject, |
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365 EReject, EReject, EReject, EReject, EReject, EReject, |
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366 EReject, EReject, EReject, |
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367 }, |
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368 |
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369 /* Previous character ESpecialFollowingVowel */ |
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370 { |
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371 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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372 ERejectStrict, EAccept, ERejectStrict, EReject, EReject, |
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373 EReject, EReject, EReject, EReject, EReject, EReject, |
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374 EReject, EReject, EReject, |
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375 }, |
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376 |
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377 /* Previous character EShortBelowVowel */ |
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378 { |
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379 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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380 EAccept, ERejectStrict, EAccept, EReject, EReject, |
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381 EReject, EComposite, EComposite, EComposite, EReject, EReject, |
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382 EReject, EReject, EReject, |
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383 }, |
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384 |
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385 /* Previous character ELongBelowVowel */ |
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386 { |
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387 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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388 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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389 EReject, EComposite, EReject, EReject, EReject, EReject, |
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390 EReject, EReject, EReject, |
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391 }, |
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392 |
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393 /* Previous character EBelowDiacritic */ |
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394 { |
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395 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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396 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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397 EReject, EReject, EReject, EReject, EReject, EReject, |
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398 EReject, EReject, EReject, |
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399 }, |
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400 |
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401 /* Previous character EToneMark */ |
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402 { |
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403 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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404 EAccept, EAccept, EAccept, EReject, EReject, |
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405 EReject, EReject, EReject, EReject, EReject, EReject, |
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406 EReject, EReject, EReject, |
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407 }, |
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408 |
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409 /* Previous character EAboveDiacritic0 */ |
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410 { |
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411 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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412 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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413 EReject, EReject, EReject, EReject, EReject, EReject, |
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414 EReject, EReject, EReject, |
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415 }, |
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416 |
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417 /* Previous character EAboveDiacritic1 */ |
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418 { |
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419 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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420 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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421 EReject, EReject, EReject, EReject, EReject, EReject, |
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422 EReject, EReject, EReject, |
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423 }, |
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424 |
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425 /* Previous character EAboveDiacritic2 */ |
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426 { |
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427 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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428 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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429 EReject, EReject, EReject, EReject, EReject, EReject, |
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430 EReject, EReject, EReject, |
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431 }, |
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432 |
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433 /* Previous character EAboveDiacritic3 */ |
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434 { |
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435 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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436 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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437 EReject, EReject, EReject, EReject, EReject, EReject, |
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438 EReject, EReject, EReject, |
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439 }, |
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440 |
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441 /* Previous character EAboveVowel1 */ |
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442 { |
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443 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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444 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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445 EReject, EComposite, EReject, EComposite, EReject, EReject, |
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446 // EReject, EComposite, EComposite, EComposite, EReject, EReject, |
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447 EReject, EReject, EReject, |
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448 }, |
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449 |
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450 /* Previous character EAboveVowel2 */ |
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451 { |
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452 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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453 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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454 EReject, EComposite, EReject, EReject, EReject, EReject, |
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455 EReject, EReject, EReject, |
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456 }, |
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457 |
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458 /* Previous character EAboveVowel3 */ |
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459 { |
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460 EUndefined, EUndefined, EAccept, EAccept, EAccept, |
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461 ERejectStrict, ERejectStrict, EAccept, EReject, EReject, |
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462 EReject, EComposite, EReject, EReject, EReject, EReject, |
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463 // EReject, EComposite, EReject, EComposite, EReject, |
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464 EReject, EReject, EReject, |
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465 }, |
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466 |
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467 // Value at last measurement was 324 bytes. 27/6/2003 |
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468 }; |
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469 |
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470 |
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471 /** |
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472 This routine looks up the WTT 2.0 rule for the given |
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473 Thai character codes provided in the WTT 2.0 data table. |
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474 @param aPrevChar |
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475 Unicode character code preceding the assumed position. |
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476 @param aChar |
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477 Unicode character code proceeding the assumed position. |
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478 @return Wtt2Rule |
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479 The rule value found in data table. |
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480 */ |
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481 Wtt2Rule LookupWtt2Rule(TUint aPrevChar, TUint aChar) |
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482 { |
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483 const CharClassification prevCharClassification = |
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484 static_cast<CharClassification>( |
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485 (aPrevChar > KThaiCodePageStart && aPrevChar < KThaiCodePageEnd) ? |
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486 iCharClassifications[aPrevChar - KThaiCodePageStart] : |
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487 ENonPrintable); |
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488 const CharClassification charClassification = |
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489 static_cast<CharClassification>( |
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490 (aChar > KThaiCodePageStart && aChar < KThaiCodePageEnd) ? |
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491 iCharClassifications[aChar - KThaiCodePageStart] : |
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492 ENonPrintable); |
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493 |
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494 return static_cast<Wtt2Rule> |
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495 (iInputRules[prevCharClassification][charClassification]); |
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496 } |
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497 |
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498 } |
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499 |
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500 using namespace ThaiCharRules; |
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501 |
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502 |
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503 // |
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504 // |
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505 // ThaiGlyphPUASubstitution Namespace definition |
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506 // |
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507 // |
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508 |
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509 |
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510 /** |
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511 This utility namespace holds the data and lookup mechanisms to support |
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512 the GlyphSelector_Thai glyph selection class in choosing Private User |
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513 Area (PUA) Thai character positional variant glyphs. Use of the PUA glyphs |
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514 results in a satisfactory rendition of Thai writing in Symbian OS. |
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515 @internalComponent |
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516 */ |
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517 namespace ThaiGlyphPUASubstitution |
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518 { |
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519 |
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520 typedef TBool (*UnicodeCharValidator)(const TGlyphSelectionState& aGss); |
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521 |
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522 struct PUASubstTableEntry |
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523 { |
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524 TUint iOrigGlyph; |
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525 TUint iPUAGlyph; |
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526 UnicodeCharValidator iRuleFunc; |
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527 }; |
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528 |
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529 |
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530 /** |
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531 ThaiGlyphPUASubstitution rule method which checks the context for |
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532 short consonant preceding char OR |
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533 short consonant & dependent vowel below preceding char. |
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534 @param aGss |
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535 Container object holds the glyph selection context for the method. |
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536 @return TBool |
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537 ETrue when the rule context is satisfied, EFalse if not. |
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538 */ |
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539 TBool RuleShortConsonant(const TGlyphSelectionState& aGss) |
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540 { |
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541 if (aGss.iParam.iOutputGlyphs == 1) { |
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542 //check the context for short consonant preceding char |
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543 TUint consonantGss = aGss.iParam.iOutput[0].iCode; |
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544 if (ThaiGlyph::IsThaiShortConsonant(consonantGss) || |
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545 consonantGss == ThaiGlyph::KYoYingPua || |
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546 consonantGss == ThaiGlyph::KThoThanPua) |
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547 return ETrue; |
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548 else |
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549 return EFalse; |
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550 } |
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551 if (aGss.iParam.iOutputGlyphs == 2) { |
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552 //check the context for short consonant & dependent vowel below preceding char |
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553 TUint consonantGss = aGss.iParam.iOutput[0].iCode; |
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554 TUint depVowelGss = aGss.iParam.iOutput[1].iCode; |
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555 if ((ThaiGlyph::IsThaiShortConsonant(consonantGss) || |
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556 consonantGss == ThaiGlyph::KYoYingPua || |
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557 consonantGss == ThaiGlyph::KThoThanPua) && |
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558 (ThaiGlyph::IsThaiDepVowelBelow(depVowelGss) || |
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559 (depVowelGss >= 0xF718 && |
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560 depVowelGss <= 0xF71A))) |
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561 return ETrue; |
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562 else |
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563 return EFalse; |
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564 } |
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565 return EFalse; |
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566 } |
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567 |
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568 /** |
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569 ThaiGlyphPUASubstitution rule method which checks the context for |
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570 tall consonant preceding char. |
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571 @param aGss |
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572 Container object holds the glyph selection context for the method. |
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573 @return TBool |
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574 ETrue when the rule context is satisfied, EFalse if not. |
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575 */ |
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576 TBool RuleTallConsonant(const TGlyphSelectionState& aGss) |
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577 { |
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578 if ((aGss.iParam.iOutputGlyphs == 1) && |
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579 ThaiGlyph::IsThaiTallConsonant(aGss.iParam.iOutput[0].iCode)) |
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580 return ETrue; |
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581 else |
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582 return EFalse; |
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583 } |
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584 |
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585 /** |
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586 ThaiGlyphPUASubstitution rule method which checks the context for a tall |
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587 consonant which does not have a dependent vowel above or a nikhahit or a |
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588 following sara am. |
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589 @param aGss |
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590 Container object holds the glyph selection context for the method. |
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591 @return TBool |
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592 ETrue when the rule context is satisfied, EFalse if not. |
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593 */ |
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594 TBool RuleTallConsonantNoVowelAbove(const TGlyphSelectionState& aGss) |
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595 { |
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596 if (aGss.iParam.iOutputGlyphs == 0) |
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597 return EFalse; |
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598 if (!ThaiGlyph::IsThaiTallConsonant(aGss.iParam.iOutput[0].iCode)) |
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599 return EFalse; |
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600 if (aGss.iParam.iOutputGlyphs == 1) |
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601 return ETrue; |
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602 if (aGss.iParam.iOutputGlyphs != 2) |
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603 return EFalse; |
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604 TUint wantDepVowel = aGss.iParam.iOutput[1].iCode; |
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605 if (ThaiGlyph::IsThaiDepVowelAbove(wantDepVowel) |
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606 || ThaiGlyph::IsThaiDepVowelAbovePUA(wantDepVowel) |
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607 || wantDepVowel == ThaiGlyph::KNikhahit |
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608 || wantDepVowel == ThaiGlyph::KNikhahitPua) |
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609 return EFalse; |
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610 return ETrue; |
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611 } |
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612 |
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613 /** |
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614 ThaiGlyphPUASubstitution rule method which checks the context for tall |
|
615 consonant with either a dependent vowel above or nikhahit. |
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616 @param aGss |
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617 Container object holds the glyph selection context for the method. |
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618 @return TBool |
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619 ETrue when the rule context is satisfied, EFalse if not. |
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620 */ |
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621 TBool RuleTallConsonantVowelAbove(const TGlyphSelectionState& aGss) |
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622 { |
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623 if ((aGss.iParam.iOutputGlyphs == 2) && |
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624 ThaiGlyph::IsThaiTallConsonant(aGss.iParam.iOutput[0].iCode) && |
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625 (ThaiGlyph::IsThaiDepVowelAbovePUA(aGss.iParam.iOutput[1].iCode)) |
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626 || aGss.iParam.iOutput[1].iCode == ThaiGlyph::KNikhahitPua) |
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627 return ETrue; |
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628 else |
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629 return EFalse; |
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630 } |
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631 |
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632 /** |
|
633 ThaiGlyphPUASubstitution rule method which checks the context for |
|
634 consonant with joined descender preceding char. |
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635 @param aGss |
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636 Container object holds the glyph selection context for the method. |
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637 @return TBool |
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638 ETrue when the rule context is satisfied, EFalse if not. |
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639 */ |
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640 TBool RuleConsonantWithJointDescender(const TGlyphSelectionState& aGss) |
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641 { |
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642 if ((aGss.iParam.iOutputGlyphs == 1) && |
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643 ThaiGlyph::IsThaiConsonantWithJointDescender(aGss.iParam.iOutput[0].iCode)) |
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644 return ETrue; |
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645 else |
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646 return EFalse; |
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647 } |
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648 |
|
649 |
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650 const PUASubstTableEntry RuleTable[] = { |
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651 /** |
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652 This data member of the ThaiGlyphPUASubstitution class holds rules |
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653 on when a given PUA glyph should be substituted for the original |
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654 0x0Exx glyph. Table lookup returns the first match found from the |
|
655 start of the table, therefore duplicate match situations must be |
|
656 avoided in the rule set logic. |
|
657 */ |
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658 /* iOrigGlyph, iPUAGlyph, iRuleFunc */ |
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659 |
|
660 // Substitutions for a tone or sign mark above a short consonant |
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661 { 0x0E48, 0xF70A, RuleShortConsonant }, |
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662 { 0x0E49, 0xF70B, RuleShortConsonant }, |
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663 { 0x0E4A, 0xF70C, RuleShortConsonant }, |
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664 { 0x0E4B, 0xF70D, RuleShortConsonant }, |
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665 { 0x0E4C, 0xF70E, RuleShortConsonant }, |
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666 |
|
667 // Substitutions for a vowel or sign mark above a tall consonant |
|
668 { 0x0E34, 0xF701, RuleTallConsonant }, |
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669 { 0x0E35, 0xF702, RuleTallConsonant }, |
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670 { 0x0E36, 0xF703, RuleTallConsonant }, |
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671 { 0x0E37, 0xF704, RuleTallConsonant }, |
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672 { 0x0E31, 0xF710, RuleTallConsonant }, |
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673 { 0x0E4D, 0xF711, RuleTallConsonant }, |
|
674 { 0x0E47, 0xF712, RuleTallConsonant }, |
|
675 |
|
676 // Substitutions for a tone or sign mark above a tall consonant |
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677 { 0x0E48, 0xF705, RuleTallConsonantNoVowelAbove }, |
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678 { 0x0E49, 0xF706, RuleTallConsonantNoVowelAbove }, |
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679 { 0x0E4A, 0xF707, RuleTallConsonantNoVowelAbove }, |
|
680 { 0x0E4B, 0xF708, RuleTallConsonantNoVowelAbove }, |
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681 { 0x0E4C, 0xF709, RuleTallConsonantNoVowelAbove }, |
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682 |
|
683 // Substitutions for a tone or sign mark above a vowel which is |
|
684 // above a tall consonant |
|
685 { 0x0E48, 0xF713, RuleTallConsonantVowelAbove }, |
|
686 { 0x0E49, 0xF714, RuleTallConsonantVowelAbove }, |
|
687 { 0x0E4A, 0xF715, RuleTallConsonantVowelAbove }, |
|
688 { 0x0E4B, 0xF716, RuleTallConsonantVowelAbove }, |
|
689 { 0x0E4C, 0xF717, RuleTallConsonantVowelAbove }, |
|
690 |
|
691 // Substitutions for a vowel or sign mark below a consonant with a |
|
692 // joined descender |
|
693 { 0x0E38, 0xF718, RuleConsonantWithJointDescender }, |
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694 { 0x0E39, 0xF719, RuleConsonantWithJointDescender }, |
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695 { 0x0E3A, 0xF71A, RuleConsonantWithJointDescender }, |
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696 |
|
697 { 0, 0, 0} |
|
698 |
|
699 // Size of table at last measurement was 312 bytes. 27/6/2003 |
|
700 }; |
|
701 |
|
702 |
|
703 /** |
|
704 This is the lookup method to determine if the current character being |
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705 processed needs to be substituted for a glyph in the PUA area given the |
|
706 supplied context. It scans the rule table and returns when it finds it's |
|
707 first match. Therefore duplicate match situations must be avoided in |
|
708 the rule set logic. |
|
709 @param aCode |
|
710 On input it is the character to lookup, on exit it is either unchanged |
|
711 or a code in the PUA 0xF700..0xF71A. |
|
712 @param aGss |
|
713 Container object holds the glyph selection context for the method. |
|
714 @return TBool |
|
715 ETrue when a match is found and aCode has changed, EFalse otherwise. |
|
716 */ |
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717 TBool Lookup(TUint& aCode, const TGlyphSelectionState& aGss) |
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718 { |
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719 const PUASubstTableEntry* tablePtr = RuleTable; |
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720 while (tablePtr->iOrigGlyph) |
|
721 { |
|
722 if ((aCode == tablePtr->iOrigGlyph) && tablePtr->iRuleFunc(aGss)) |
|
723 { |
|
724 aCode = tablePtr->iPUAGlyph; |
|
725 return ETrue; // Rule match, substitute glyph code |
|
726 } |
|
727 tablePtr++; |
|
728 } |
|
729 return EFalse; // No match in table |
|
730 } |
|
731 } |
|
732 |
|
733 |
|
734 // |
|
735 // |
|
736 // GlyphSelector_Thai Class definition |
|
737 // |
|
738 // |
|
739 |
|
740 |
|
741 /** |
|
742 This is the default glyph processing method for the Thai characters in the |
|
743 range 0x0E00..0x0E7F and is invoked from the Glyph selection algorithm in |
|
744 CFont::GetCharacterPosition() method. It is capable of processing base |
|
745 Thai characters as well as Thai combining vowels, signs a tone marks. |
|
746 @param aGss |
|
747 Container object holds the input/output parameters of the method. |
|
748 @return TBool |
|
749 ETrue when glyph cluster updated successfully, EFalse on error condition. |
|
750 @see |
|
751 The method GlyphSelector_Thai::Process() also handles it for other cases. |
|
752 */ |
|
753 TBool GlyphSelector_Thai::Process(TGlyphSelectionState& aGss, RShapeInfo&) |
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754 { |
|
755 // Get the Unicode character codes we need to process the current |
|
756 // glyph and increment the iterator onto th next character. |
|
757 TUint prevCode = (aGss.iText.LengthToStart() > 0) ? aGss.iText.Get(-1) : 0xFFFF; |
|
758 TUint code = aGss.iText.GetThenNext(); // Inc to next char |
|
759 TUint nextCode = !aGss.iText.AtEnd() ? aGss.iText.Get(0) : 0xFFFF; |
|
760 |
|
761 // Is it a Thai base char or a mark (combining) char? |
|
762 if ((aGss.iCats & 0xF0) == TChar::EMarkGroup) |
|
763 { |
|
764 |
|
765 // Thai character is combining mark but first check to see if it |
|
766 // follows a Thai base character before processing it. |
|
767 if ((aGss.iParam.iOutputGlyphs > 0) && |
|
768 !ThaiGlyph::IsThaiGlyph(prevCode)) |
|
769 { |
|
770 (void) aGss.iText.Prev(); |
|
771 aGss.iClusterState = TGlyphSelectionState::EGClusterComplete; |
|
772 return ETrue; |
|
773 } |
|
774 |
|
775 // Missing base glyph? Insert a dotted circle glyph if true. |
|
776 if (aGss.iParam.iOutputGlyphs == 0) |
|
777 { |
|
778 if (!aGss.AppendGlyphToCluster(KUnicodeDottedCircle)) |
|
779 return EFalse; |
|
780 aGss.iParam.iPen += aGss.iAdvance; |
|
781 } |
|
782 |
|
783 // Test if SARA AM follows this current Thai mark, since it is |
|
784 // a SPECIAL CASE. If present we need NIKHAHIT glyph before this |
|
785 // current Thai mark char. |
|
786 if (nextCode == ThaiGlyph::KSaraAm && |
|
787 (aGss.iParam.iOutputGlyphs == 1) && ThaiGlyph::IsThaiToneMark(code)) |
|
788 { |
|
789 TUint nikhahit = ThaiGlyph::KNikhahit; |
|
790 // Check and do PUA glyph substitution on Nikhahit |
|
791 ThaiGlyphPUASubstitution::Lookup(nikhahit, aGss); |
|
792 |
|
793 if (!aGss.AppendGlyphToCluster(nikhahit)) |
|
794 return EFalse; |
|
795 |
|
796 // Check and do PUA glyph substitution on combining mark |
|
797 ThaiGlyphPUASubstitution::Lookup(code, aGss); |
|
798 |
|
799 // Append the curernt Thai Mark to the output stack of glyphs. |
|
800 if (!aGss.AppendGlyphToCluster(code)) |
|
801 return EFalse; |
|
802 |
|
803 // We now need to add SARA AA glyph after the current Thai mark char. |
|
804 aGss.iAdvance.iWidth = aGss.iAdvance.iHeight = 0; |
|
805 if (!aGss.AppendGlyphToCluster(ThaiGlyph::KSaraAa)) |
|
806 return EFalse; |
|
807 |
|
808 // Skip the following SARA AM character since we've added |
|
809 // its glyphs to it's previous character's glyph cluster. |
|
810 // As we've added a base char to the end of the glyph cluster |
|
811 // make sure the pen is moved on by the caller. |
|
812 (void) aGss.iText.Next(); |
|
813 aGss.iPen = TGlyphSelectionState::EPenAdvance_Yes; |
|
814 } |
|
815 else |
|
816 { |
|
817 // Check and do PUA glyph substitution on combining mark |
|
818 ThaiGlyphPUASubstitution::Lookup(code, aGss); |
|
819 |
|
820 // Append the curernt Thai Mark to the output stack of glyphs. |
|
821 if (!aGss.AppendGlyphToCluster(code)) |
|
822 return EFalse; |
|
823 |
|
824 aGss.iPen = TGlyphSelectionState::EPenAdvance_No; |
|
825 } |
|
826 } |
|
827 else |
|
828 |
|
829 { |
|
830 // Thai character is an independent consonant, digit or sign |
|
831 |
|
832 // Handle disjoint descender consonants followed by below vowel. |
|
833 // In these two cases we substitute consonant with PUA |
|
834 // consonant that the descender removed. Check code not last one. |
|
835 if (code == ThaiGlyph::KYoYing && nextCode != 0xffff && |
|
836 ThaiGlyph::IsThaiDepVowelBelow(nextCode)) |
|
837 code = ThaiGlyph::KYoYingPua; |
|
838 else if (code == ThaiGlyph::KThoThan && nextCode != 0xffff && |
|
839 ThaiGlyph::IsThaiDepVowelBelow(nextCode)) |
|
840 code = ThaiGlyph::KThoThanPua; |
|
841 |
|
842 // Append the glyph details for the Thai character onto the output |
|
843 // stack of glyphs. |
|
844 if (!aGss.AppendGlyphToCluster(code)) |
|
845 return EFalse; |
|
846 |
|
847 // Make sure the caller advances the pen for a base char! |
|
848 aGss.iPen = TGlyphSelectionState::EPenAdvance_Yes; |
|
849 } |
|
850 |
|
851 // Lookup in rule table to determine if the current glyph and cluster is |
|
852 // now complete? |
|
853 if (ThaiCharRules::LookupWtt2Rule(aGss.iCodePt, nextCode) == ThaiCharRules::EComposite) |
|
854 aGss.iClusterState = TGlyphSelectionState::EGClusterNotComplete; |
|
855 else |
|
856 aGss.iClusterState = TGlyphSelectionState::EGClusterComplete; |
|
857 |
|
858 return ETrue; |
|
859 } |
|
860 |
|
861 |
|
862 // |
|
863 // |
|
864 // GlyphSelector_ThaiSaraAm Class definition |
|
865 // |
|
866 // |
|
867 |
|
868 |
|
869 /** |
|
870 This is the glyph processing method for the Thai SARA AM (U+0E33) character |
|
871 which is handled as a special case since it is decomposed into two glyphs |
|
872 - the combining NIKHAHIT mark & SARA AA following vowel in some cases. |
|
873 It is invoked from the Glyph selection algorithm in |
|
874 CFont::GetCharacterPosition() method for all cases where SARA AM is not |
|
875 following a tone mark and thus be a glyph cluster of its own. |
|
876 @param aGss |
|
877 Container object holds the input/output parameters of the method. |
|
878 @return TBool |
|
879 ETrue when glyph cluster updated successfully, EFalse on error condition. |
|
880 @see |
|
881 The method GlyphSelector_Thai::Process() also handles it for other cases. |
|
882 */ |
|
883 TBool GlyphSelector_ThaiSaraAm::Process(TGlyphSelectionState& aGss, RShapeInfo&) |
|
884 { |
|
885 if (aGss.iCodePt != ThaiGlyph::KSaraAm) //could have got here via |
|
886 { //FindLocalisedProcessFunc in font.cpp |
|
887 RShapeInfo dummy; |
|
888 return GlyphSelector_Thai::Process(aGss, dummy); |
|
889 } |
|
890 |
|
891 // Pen advance accumulator local variable |
|
892 TSize compoundAdvance; |
|
893 |
|
894 if (aGss.iText.LengthToStart() == 0) |
|
895 { |
|
896 // If at the start of a line then render it with a preceding |
|
897 // dotted circle as this is invalid positioning for SARA AM. |
|
898 |
|
899 if (!aGss.AppendGlyphToCluster(KUnicodeDottedCircle)) |
|
900 return EFalse; |
|
901 aGss.iParam.iPen += aGss.iAdvance; |
|
902 |
|
903 aGss.iAdvance.iWidth = aGss.iAdvance.iHeight = 0; |
|
904 if (!aGss.AppendGlyphToCluster(ThaiGlyph::KSaraAm)) |
|
905 return EFalse; |
|
906 compoundAdvance += aGss.iAdvance; |
|
907 } |
|
908 else |
|
909 { |
|
910 // Normal condition - text iterator now some way into the text line |
|
911 // being processed. |
|
912 |
|
913 TUint prevChar = aGss.iText.Get(-1); |
|
914 if (ThaiGlyph::IsThaiShortConsonant(prevChar)) |
|
915 { |
|
916 // SARA AM is following normal height consonant so we can output |
|
917 // non-decomposed SARA AM glyph. |
|
918 |
|
919 if (!aGss.AppendGlyphToCluster(ThaiGlyph::KSaraAm)) |
|
920 return EFalse; |
|
921 compoundAdvance = aGss.iAdvance; |
|
922 } |
|
923 else if (ThaiGlyph::IsThaiTallConsonant(prevChar)) |
|
924 { |
|
925 // SARA AM is following tall consonant so we output decomposed |
|
926 // version of SARA AM but with NIKHAHIT taken from the PUA. |
|
927 |
|
928 if (!aGss.AppendGlyphToCluster(ThaiGlyph::KNikhahitPua)) |
|
929 return EFalse; |
|
930 compoundAdvance = aGss.iAdvance; |
|
931 aGss.iAdvance.iWidth = aGss.iAdvance.iHeight = 0; |
|
932 if (!aGss.AppendGlyphToCluster(ThaiGlyph::KSaraAa)) |
|
933 return EFalse; |
|
934 compoundAdvance += aGss.iAdvance; |
|
935 } |
|
936 else |
|
937 { |
|
938 // SARA AM is a following vowel but is not following a valid |
|
939 // consonant char and so default is to render with dotted circle. |
|
940 if (!aGss.AppendGlyphToCluster(KUnicodeDottedCircle)) |
|
941 return EFalse; |
|
942 aGss.iParam.iPen += aGss.iAdvance; |
|
943 |
|
944 aGss.iAdvance.iWidth = aGss.iAdvance.iHeight = 0; |
|
945 if (!aGss.AppendGlyphToCluster(ThaiGlyph::KSaraAm)) |
|
946 return EFalse; |
|
947 compoundAdvance += aGss.iAdvance; |
|
948 } |
|
949 |
|
950 } |
|
951 |
|
952 // Update output parameters resulting from above processing. |
|
953 // Move text iterator onto next character to process. |
|
954 aGss.iText.Next(); |
|
955 |
|
956 // Advance pen just for the SARA AA char as advance for dotted |
|
957 // circle is done above. |
|
958 aGss.iAdvance = compoundAdvance; |
|
959 aGss.iPen = TGlyphSelectionState::EPenAdvance_Yes; |
|
960 |
|
961 if (!aGss.iText.AtEnd() && |
|
962 (ThaiCharRules::LookupWtt2Rule(aGss.iCodePt, aGss.iText.Get()) == |
|
963 ThaiCharRules::EComposite)) |
|
964 aGss.iClusterState = TGlyphSelectionState::EGClusterNotComplete; |
|
965 else |
|
966 aGss.iClusterState = TGlyphSelectionState::EGClusterComplete; |
|
967 |
|
968 return ETrue; |
|
969 } |