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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 "FontArabic.h" |
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25 #include "TextBasePanic.h" |
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26 |
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27 |
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28 // |
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29 // Arabic Presentation Forms. |
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30 // |
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31 |
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32 |
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33 /** |
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34 The contextual forms of each character in the range 0621 - 064A, in |
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35 the order final, initial, medial; followed by the forms of |
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36 the lam-alef ligatures (lam with 0622, 0623, 0625 and 0627); |
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37 followed by the forms of the characters in the range 0671 - 06D3 |
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38 */ |
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39 LOCAL_D const TUint16 TheArabicShapeTable[] = |
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40 { |
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41 // Contextual forms for standard Arabic letters |
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42 0x621, 0x621, 0x621, // 621 |
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43 0xfe82, 0x622, 0x622, // 622 |
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44 0xfe84, 0x623, 0x623, // 623 |
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45 0xfe86, 0x624, 0x624, // 624 |
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46 0xfe88, 0x625, 0x625, // 625 |
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47 0xfe8a, 0xfe8b, 0xfe8c, // 626 |
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48 0xfe8e, 0x627, 0x627, // 627 |
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49 0xfe90, 0xfe91, 0xfe92, // 628 |
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50 0xfe94, 0x629, 0x629, // 629 |
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51 0xfe96, 0xfe97, 0xfe98, // 62a |
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52 0xfe9a, 0xfe9b, 0xfe9c, // 62b |
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53 0xfe9e, 0xfe9f, 0xfea0, // 62c |
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54 0xfea2, 0xfea3, 0xfea4, // 62d |
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55 0xfea6, 0xfea7, 0xfea8, // 62e |
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56 0xfeaa, 0x62f, 0x62f, // 62f |
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57 0xfeac, 0x630, 0x630, // 630 |
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58 0xfeae, 0x631, 0x631, // 631 |
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59 0xfeb0, 0x632, 0x632, // 632 |
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60 0xfeb2, 0xfeb3, 0xfeb4, // 633 |
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61 0xfeb6, 0xfeb7, 0xfeb8, // 634 |
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62 0xfeba, 0xfebb, 0xfebc, // 635 |
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63 0xfebe, 0xfebf, 0xfec0, // 636 |
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64 0xfec2, 0xfec3, 0xfec4, // 637 |
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65 0xfec6, 0xfec7, 0xfec8, // 638 |
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66 0xfeca, 0xfecb, 0xfecc, // 639 |
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67 0xfece, 0xfecf, 0xfed0, // 63a |
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68 0x63b, 0x63b, 0x63b, // placeholder |
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69 0x63c, 0x63c, 0x63c, // placeholder |
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70 0x63d, 0x63d, 0x63d, // placeholder |
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71 0x63e, 0x63e, 0x63e, // placeholder |
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72 0x63f, 0x63f, 0x63f, // placeholder |
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73 0x640, 0x640, 0x640, // 640 |
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74 0xfed2, 0xfed3, 0xfed4, // 641 |
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75 0xfed6, 0xfed7, 0xfed8, // 642 |
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76 0xfeda, 0xfedb, 0xfedc, // 643 |
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77 0xfede, 0xfedf, 0xfee0, // 644 |
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78 0xfee2, 0xfee3, 0xfee4, // 645 |
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79 0xfee6, 0xfee7, 0xfee8, // 646 |
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80 0xfeea, 0xfeeb, 0xfeec, // 647 |
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81 0xfeee, 0x648, 0x648, // 648 |
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82 0xfef0, 0xfbe8, 0xfbe9, // 649 |
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83 0xfef2, 0xfef3, 0xfef4, // 64A |
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84 |
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85 // Contextual forms for lam-alef ligatures |
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86 0xfef6, 0xfef5, 0xfef5, // 644 + 622 |
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87 0xfef8, 0xfef7, 0xfef7, // 644 + 623 |
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88 0xfefa, 0xfef9, 0xfef9, // 644 + 625 |
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89 0xfefc, 0xfefb, 0xfefb, // 644 + 627 |
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90 |
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91 // Contextual forms for extended Arabic letters for Persian, Urdu, Sindhi, etc. |
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92 0xfb51, 0x0671, 0x0671, // 671 |
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93 0x0672, 0x0672, 0x0672, // placeholder |
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94 0x0673, 0x0673, 0x0673, // placeholder |
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95 0x0674, 0x0674, 0x0674, // placeholder |
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96 0x0675, 0x0675, 0x0675, // placeholder |
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97 0x0676, 0x0676, 0x0676, // placeholder |
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98 0x0677, 0x0677, 0x0677, // placeholder |
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99 0x0678, 0x0678, 0x0678, // placeholder |
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100 0xfb67, 0xfb68, 0xfb69, // 679 |
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101 0xfb5f, 0xfb60, 0xfb61, // 67a |
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102 0xfb53, 0xfb54, 0xfb55, // 67b |
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103 0x067c, 0x067c, 0x067c, // placeholder |
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104 0x067d, 0x067d, 0x067d, // placeholder |
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105 0xfb57, 0xfb58, 0xfb59, // 67e |
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106 0xfb63, 0xfb64, 0xfb65, // 67f |
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107 |
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108 0xfb5b, 0xfb5c, 0xfb5d, // 680 |
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109 0x0681, 0x0681, 0x0681, // placeholder |
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110 0x0682, 0x0682, 0x0682, // placeholder |
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111 0xfb77, 0xfb78, 0xfb79, // 683 |
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112 0xfb73, 0xfb74, 0xfb75, // 684 |
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113 0x0685, 0x0685, 0x0685, // placeholder |
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114 0xfb7b, 0xfb7c, 0xfb7d, // 686 |
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115 0xfb7f, 0xfb80, 0xfb81, // 687 |
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116 0xfb89, 0x0688, 0x0688, // 688 |
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117 0x0689, 0x0689, 0x0689, // placeholder |
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118 0x068a, 0x068a, 0x068a, // placeholder |
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119 0x068b, 0x068b, 0x068b, // placeholder |
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120 0xfb85, 0x068c, 0x068c, // 68c |
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121 0xfb83, 0x068d, 0x068d, // 68d |
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122 0xfb87, 0x068e, 0x068e, // 68e |
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123 0x068f, 0x068f, 0x068f, // placeholder |
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124 |
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125 0x0690, 0x0690, 0x0690, // placeholder |
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126 0xfb8d, 0x0691, 0x0691, // 691 |
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127 0x0692, 0x0692, 0x0692, // placeholder |
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128 0x0693, 0x0693, 0x0693, // placeholder |
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129 0x0694, 0x0694, 0x0694, // placeholder |
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130 0x0695, 0x0695, 0x0695, // placeholder |
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131 0x0696, 0x0696, 0x0696, // placeholder |
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132 0x0697, 0x0697, 0x0697, // placeholder |
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133 0xfb8b, 0x0698, 0x0698, // 698 |
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134 0x0699, 0x0699, 0x0699, // placeholder |
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135 0x069a, 0x069a, 0x069a, // placeholder |
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136 0x069b, 0x069b, 0x069b, // placeholder |
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137 0x069c, 0x069c, 0x069c, // placeholder |
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138 0x069d, 0x069d, 0x069d, // placeholder |
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139 0x069e, 0x069e, 0x069e, // placeholder |
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140 0x069f, 0x069f, 0x069f, // placeholder |
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141 |
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142 0x06a0, 0x06a0, 0x06a0, // placeholder |
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143 0x06a1, 0x06a1, 0x06a1, // placeholder |
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144 0x06a2, 0x06a2, 0x06a2, // placeholder |
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145 0x06a3, 0x06a3, 0x06a3, // placeholder |
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146 0xfb6b, 0xfb6c, 0xfb6d, // 6a4 |
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147 0x06a5, 0x06a5, 0x06a5, // placeholder |
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148 0xfb6f, 0xfb70, 0xfb71, // 6a6 |
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149 0x06a7, 0x06a7, 0x06a7, // placeholder |
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150 0x06a8, 0x06a8, 0x06a8, // placeholder |
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151 0xfb8f, 0xfb90, 0xfb91, // 6a9 |
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152 0x06aa, 0x06aa, 0x06aa, // 6aa |
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153 0x06ab, 0x06ab, 0x06ab, // 6ab |
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154 0x06ac, 0x06ac, 0x06ac, // 6ac |
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155 0xfbd4, 0xfbd5, 0xfbd6, // 6ad |
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156 0x06ae, 0x06ae, 0x06ae, // 6ae |
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157 0xfb93, 0xfb94, 0xfb95, // 6af |
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158 |
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159 0x06b0, 0x06b0, 0x06b0, // placeholder |
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160 0xfb9b, 0xfb9c, 0xfb9d, // 6b1 |
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161 0x06b2, 0x06b2, 0x06b2, // 6b2 |
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162 0xfb97, 0xfb98, 0xfb99, // 6b3 |
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163 0x06b4, 0x06b4, 0x06b4, // placeholder |
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164 0x06b5, 0x06b5, 0x06b5, // placeholder |
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165 0x06b6, 0x06b6, 0x06b6, // placeholder |
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166 0x06b7, 0x06b7, 0x06b7, // placeholder |
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167 0x06b8, 0x06b8, 0x06b8, // placeholder |
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168 0x06b9, 0x06b9, 0x06b9, // placeholder |
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169 0xfb9f, 0x06ba, 0x06ba, // 6ba |
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170 0xfba1, 0xfba2, 0xfba3, // 6bb |
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171 0x06bc, 0x06bc, 0x06bc, // placeholder |
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172 0x06bd, 0x06bd, 0x06bd, // placeholder |
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173 0xfbab, 0xfbac, 0xfbad, // 6be |
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174 0x06bf, 0x06bf, 0x06bf, // placeholder |
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175 |
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176 0xfba5, 0x06c0, 0x06c0, // 6c0 |
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177 0xfba7, 0xfba8, 0xfba9, // 6c1 |
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178 0x06c2, 0x06c2, 0x06c2, // placeholder |
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179 0x06c3, 0x06c3, 0x06c3, // placeholder |
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180 0x06c4, 0x06c4, 0x06c4, // placeholder |
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181 0xfbe1, 0x06c5, 0x06c5, // 6c5 |
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182 0xfbda, 0x06c6, 0x06c6, // 6c6 |
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183 0xfbd8, 0x06c7, 0x06c7, // 6c7 |
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184 0xfbdc, 0x06c8, 0x06c8, // 6c8 |
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185 0xfbe3, 0x06c9, 0x06c9, // 6c9 |
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186 0x06ca, 0x06ca, 0x06ca, // placeholder |
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187 0xfbdf, 0x06cb, 0x06cb, // 6cb |
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188 0xfbfd, 0xfbfe, 0xfbff, // 6cc |
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189 0x06cd, 0x06cd, 0x06cd, // placeholder |
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190 0x06ce, 0x06ce, 0x06ce, // placeholder |
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191 0x06cf, 0x06cf, 0x06cf, // placeholder |
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192 |
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193 0xfbe5, 0xfbe6, 0xfbe7, // 6d0 |
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194 0x06d1, 0x06d1, 0x06d1, // placeholder |
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195 0xfbaf, 0x06d2, 0x06d2, // 6d2 |
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196 0xfbb1, 0x06d3, 0x06d3 // 6d3 |
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197 }; |
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198 |
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199 |
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200 static const int KFinal = 0; |
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201 static const int KInitial = 1; |
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202 static const int KMedial = 2; |
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203 static const int KStandardShapeTableOffset = 0x621; |
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204 static const int KLamAlefShapeTableStart = 0x64B - 0x621; |
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205 static const int KExtendedShapeTableOffset = 0x671 - (0x64f - 0x621); |
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206 |
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207 |
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208 static inline TInt ArabicShapeTableIndex(TInt aCode) |
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209 { |
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210 if (aCode >= 0x621 && aCode <= 0x64a) |
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211 return (aCode - KStandardShapeTableOffset) * 3; |
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212 if (aCode >= 0x671 && aCode <= 0x6d3) |
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213 return (aCode - KExtendedShapeTableOffset) * 3; |
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214 return KErrNotFound; |
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215 } |
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216 |
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217 |
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218 static inline TBool IsArabicPoint(TInt aCode) |
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219 { |
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220 return (aCode >= 0x64B && aCode <= 0x655) || aCode == 0x670; |
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221 } |
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222 |
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223 TInt ConsumeCharsAndDeterminePresentationForm(const TUtf32Iterator& aText, |
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224 TUint aFlags, TInt& aLigaturePortionsRemaining) |
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225 /** |
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226 Get the Arabic or other presentation form, consuming as many characters |
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227 as necessary. This function can cope with text that has already been |
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228 reversed. |
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229 @internalComponent |
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230 */ |
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231 { |
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232 TUint c = aText.Get(); |
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233 TInt index = ArabicShapeTableIndex(c); |
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234 if (index != -1) |
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235 { |
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236 if (aLigaturePortionsRemaining != 0) |
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237 { |
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238 --aLigaturePortionsRemaining; |
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239 TEXTBASE_ASSERT_DEBUG(!aText.AtEnd(), ETextBasePanic_Invariant); |
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240 return 0xFFFF; |
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241 } |
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242 |
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243 int position = -1; |
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244 |
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245 // Find previous and next character, skipping Arabic points. |
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246 TUtf32Iterator tmpText(aText); |
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247 tmpText.Prev(); |
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248 TUint prev = 0xFFFF; |
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249 while (!tmpText.BeforeStart() && (prev == 0xFFFF || IsArabicPoint(prev))) |
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250 prev = tmpText.GetThenPrev(); |
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251 |
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252 tmpText = aText; |
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253 tmpText.Next(); |
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254 TUint next = 0xFFFF; |
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255 while (!tmpText.AtEnd() && (next == 0xFFFF || IsArabicPoint(next))) |
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256 next = tmpText.GetThenNext(); |
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257 |
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258 TInt possible_lam = (aFlags & CFont::TPositionParam::EFLogicalOrder)? |
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259 c : next; |
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260 TInt possible_alef = (aFlags & CFont::TPositionParam::EFLogicalOrder)? |
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261 next : c; |
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262 |
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263 // Perform lam-alef ligation if necessary. |
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264 if (possible_lam == 0x644 && |
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265 (possible_alef == 0x622 || possible_alef == 0x623 || possible_alef == 0x625 || possible_alef == 0x627)) |
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266 { |
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267 switch(possible_alef) |
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268 { |
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269 case 0x622: |
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270 { |
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271 c = 0xfef5; |
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272 index = KLamAlefShapeTableStart; |
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273 break; |
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274 } |
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275 case 0x623: |
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276 { |
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277 c = 0xfef7; |
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278 index = KLamAlefShapeTableStart + 1; |
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279 break; |
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280 } |
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281 case 0x625: |
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282 { |
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283 c = 0xfef9; |
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284 index = KLamAlefShapeTableStart + 2; |
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285 break; |
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286 } |
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287 default: |
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288 { |
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289 c = 0xfefb; |
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290 index = KLamAlefShapeTableStart + 3; |
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291 } |
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292 } |
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293 index *= 3; |
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294 aLigaturePortionsRemaining = 2; |
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295 |
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296 next = 0xFFFF; |
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297 while (!tmpText.AtEnd() && (next == 0xFFFF || IsArabicPoint(next))) |
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298 { |
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299 next = tmpText.Get(); |
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300 tmpText.Next(); |
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301 } |
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302 } |
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303 |
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304 TInt left = (aFlags & CFont::TPositionParam::EFLogicalOrder)? prev : next; |
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305 TInt right = (aFlags & CFont::TPositionParam::EFLogicalOrder)? next : prev; |
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306 |
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307 TBool prefix = FALSE; |
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308 if (left == 0x640 || left == 0x200D) // kashida or Zero-Width Joiner |
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309 prefix = TRUE; |
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310 else |
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311 { |
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312 TInt left_index = ArabicShapeTableIndex(left); |
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313 if (left_index != -1) |
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314 { |
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315 if (static_cast<TInt>(TheArabicShapeTable[left_index + KInitial]) != left || |
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316 static_cast<TInt>(TheArabicShapeTable[left_index + KMedial]) != left) |
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317 prefix = TRUE; |
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318 } |
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319 } |
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320 TBool suffix = FALSE; |
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321 if (right == 0x640 || right == 0x200D) // kashida or Zero-Width Joiner |
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322 suffix = TRUE; |
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323 else |
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324 { |
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325 TInt right_index = ArabicShapeTableIndex(right); |
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326 if (right_index != -1) |
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327 { |
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328 if (static_cast<TInt>(TheArabicShapeTable[right_index + KFinal]) != right || |
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329 static_cast<TInt>(TheArabicShapeTable[right_index + KMedial]) != right) |
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330 suffix = TRUE; |
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331 } |
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332 } |
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333 TBool medial = static_cast<TUint>(TheArabicShapeTable[index + KMedial]) != c; |
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334 if (medial) |
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335 { |
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336 if (prefix && suffix) |
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337 position = KMedial; |
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338 else if (prefix) |
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339 position = KFinal; |
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340 else if (suffix) |
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341 position = KInitial; |
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342 } |
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343 else |
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344 { |
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345 if (prefix) |
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346 position = KFinal; |
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347 else if (suffix) |
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348 position = KInitial; |
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349 } |
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350 if (position >= 0) |
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351 c = TheArabicShapeTable[index + position]; |
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352 } |
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353 |
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354 return c; |
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355 } |
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356 |
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357 |
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358 // |
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359 // |
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360 // GlyphSelector_Arabic Class definition |
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361 // |
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362 // |
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363 |
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364 TBool GlyphSelector_Arabic::Process(TGlyphSelectionState& aGss, RShapeInfo&) |
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365 { |
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366 // Select glyph - use presentation form if applicable. |
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367 TInt ligaturePortions = aGss.iLigaturePortionsRemaining; |
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368 TUint flags = aGss.iParam.iFlags; |
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369 TUint code = ConsumeCharsAndDeterminePresentationForm(aGss.iText, |
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370 flags, ligaturePortions); |
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371 |
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372 aGss.iText.Next(); |
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373 aGss.iClusterState = !aGss.iText.AtEnd() && |
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374 (aGss.iText.Get().GetCategory() & 0xF0) == TChar::EMarkGroup? |
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375 TGlyphSelectionState::EGClusterNotComplete |
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376 : TGlyphSelectionState::EGClusterComplete; |
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377 |
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378 // If we are beginning a new portion of a ligature, we must set the state. |
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379 if (ligaturePortions != aGss.iLigaturePortionsRemaining) |
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380 { |
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381 if (ligaturePortions != 1) |
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382 aGss.iClusterState = TGlyphSelectionState::EGClusterNotComplete; |
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383 aGss.iLigaturePortionFirstMark = aGss.iParam.iOutputGlyphs; |
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384 if (ligaturePortions < aGss.iLigaturePortionsRemaining) |
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385 { |
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386 aGss.iLigaturePortionsRemaining = ligaturePortions; |
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387 // We have just swallowed a non-initial part of the ligature, which |
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388 // must not be drawn. |
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389 TEXTBASE_ASSERT_DEBUG(code == 0xFFFF, ETextBasePanic_Invariant); |
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390 return ETrue; |
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391 } |
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392 aGss.iLigaturePortionsRemaining = ligaturePortions; |
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393 } |
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394 |
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395 // In this method we always output the glyph code calculate previously. |
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396 if (!aGss.AppendGlyphToCluster(code)) |
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397 return EFalse; |
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398 |
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399 if (!aGss.IsCombiningClass()) |
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400 { |
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401 aGss.iPen = TGlyphSelectionState::EPenAdvance_Yes; |
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402 return ETrue; |
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403 } |
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404 |
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405 // Adjust glyph's bounds further to position this character. |
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406 aGss.iPen = TGlyphSelectionState::EPenAdvance_No; |
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407 TRect baseBounds = aGss.iParam.iOutput[0].iBounds; |
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408 TInt firstMark = 1; |
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409 if (aGss.iLigaturePortionsRemaining != 0) |
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410 { |
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411 TInt centre = (baseBounds.iBr.iX + baseBounds.iTl.iX) >> 1; |
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412 TBool firstHalf = aGss.iLigaturePortionsRemaining == 2; |
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413 TBool rightHandSide = flags & CFont::TPositionParam::EFLogicalOrder? |
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414 firstHalf : !firstHalf; |
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415 if (rightHandSide) |
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416 baseBounds.iTl.iX = centre; |
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417 else |
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418 baseBounds.iBr.iX = centre; |
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419 if (firstHalf) |
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420 aGss.iClusterState = TGlyphSelectionState::EGClusterNotComplete; |
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421 firstMark = aGss.iLigaturePortionFirstMark; |
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422 } |
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423 aGss.CombineLastGlyphToBase(baseBounds, firstMark); |
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424 |
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425 return ETrue; |
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426 } |
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427 |
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428 |
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429 TBool GlyphSelector_Arabic::CharactersJoin(TInt aLeftCharacter, TInt aRightCharacter) |
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430 { |
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431 // All the characters join to the right, so we don't need to look them up. |
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432 // as long as they are there at all, it is OK. |
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433 TBool leftIsFixedJoiner = aLeftCharacter == 0x640 || aLeftCharacter == 0x200D; |
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434 if (!leftIsFixedJoiner) |
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435 { |
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436 TInt leftIndex = ArabicShapeTableIndex(aLeftCharacter); |
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437 if (leftIndex == -1) |
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438 return EFalse; |
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439 if (static_cast<TInt>(TheArabicShapeTable[leftIndex + KFinal]) |
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440 == aLeftCharacter) |
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441 return EFalse; |
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442 } |
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443 if (aRightCharacter == 0x640 || aRightCharacter == 0x200D) |
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444 return !leftIsFixedJoiner; |
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445 TInt rightIndex = ArabicShapeTableIndex(aRightCharacter); |
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446 return rightIndex != -1 |
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447 && static_cast<TInt>(TheArabicShapeTable[rightIndex + KInitial]) |
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448 != aRightCharacter; |
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449 } |
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450 |