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1 /* |
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2 * Copyright © 2012 Google, Inc. |
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3 * |
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4 * This is part of HarfBuzz, a text shaping library. |
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5 * |
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6 * Permission is hereby granted, without written agreement and without |
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7 * license or royalty fees, to use, copy, modify, and distribute this |
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8 * software and its documentation for any purpose, provided that the |
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9 * above copyright notice and the following two paragraphs appear in |
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10 * all copies of this software. |
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11 * |
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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16 * DAMAGE. |
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17 * |
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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23 * |
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24 * Google Author(s): Behdad Esfahbod |
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25 */ |
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26 |
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27 #ifndef HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH |
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28 #define HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH |
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29 |
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30 #include "hb-private.hh" |
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31 |
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32 |
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33 #include "hb-ot-shape-complex-private.hh" |
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34 #include "hb-ot-shape-private.hh" /* XXX Remove */ |
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35 |
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36 |
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37 #define INDIC_TABLE_ELEMENT_TYPE uint16_t |
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38 |
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39 /* Cateories used in the OpenType spec: |
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40 * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx |
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41 */ |
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42 /* Note: This enum is duplicated in the -machine.rl source file. |
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43 * Not sure how to avoid duplication. */ |
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44 enum indic_category_t { |
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45 OT_X = 0, |
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46 OT_C = 1, |
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47 OT_V = 2, |
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48 OT_N = 3, |
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49 OT_H = 4, |
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50 OT_ZWNJ = 5, |
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51 OT_ZWJ = 6, |
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52 OT_M = 7, |
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53 OT_SM = 8, |
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54 OT_VD = 9, |
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55 OT_A = 10, |
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56 OT_PLACEHOLDER = 11, |
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57 OT_DOTTEDCIRCLE = 12, |
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58 OT_RS = 13, /* Register Shifter, used in Khmer OT spec. */ |
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59 OT_Coeng = 14, /* Khmer-style Virama. */ |
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60 OT_Repha = 15, /* Atomically-encoded logical or visual repha. */ |
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61 OT_Ra = 16, |
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62 OT_CM = 17, /* Consonant-Medial. */ |
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63 OT_Symbol = 18 /* Avagraha, etc that take marks (SM,A,VD). */ |
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64 }; |
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65 |
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66 #define MEDIAL_FLAGS (FLAG (OT_CM)) |
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67 |
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68 /* Note: |
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69 * |
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70 * We treat Vowels and placeholders as if they were consonants. This is safe because Vowels |
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71 * cannot happen in a consonant syllable. The plus side however is, we can call the |
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72 * consonant syllable logic from the vowel syllable function and get it all right! */ |
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73 #define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_Ra) | MEDIAL_FLAGS | FLAG (OT_V) | FLAG (OT_PLACEHOLDER) | FLAG (OT_DOTTEDCIRCLE)) |
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74 #define JOINER_FLAGS (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ)) |
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75 #define HALANT_OR_COENG_FLAGS (FLAG (OT_H) | FLAG (OT_Coeng)) |
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76 |
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77 |
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78 /* Visual positions in a syllable from left to right. */ |
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79 enum indic_position_t { |
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80 POS_START, |
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81 |
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82 POS_RA_TO_BECOME_REPH, |
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83 POS_PRE_M, |
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84 POS_PRE_C, |
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85 |
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86 POS_BASE_C, |
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87 POS_AFTER_MAIN, |
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88 |
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89 POS_ABOVE_C, |
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90 |
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91 POS_BEFORE_SUB, |
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92 POS_BELOW_C, |
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93 POS_AFTER_SUB, |
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94 |
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95 POS_BEFORE_POST, |
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96 POS_POST_C, |
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97 POS_AFTER_POST, |
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98 |
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99 POS_FINAL_C, |
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100 POS_SMVD, |
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101 |
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102 POS_END |
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103 }; |
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104 |
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105 /* Categories used in IndicSyllabicCategory.txt from UCD. */ |
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106 enum indic_syllabic_category_t { |
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107 INDIC_SYLLABIC_CATEGORY_OTHER = OT_X, |
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108 |
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109 INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_Symbol, |
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110 INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM, |
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111 INDIC_SYLLABIC_CATEGORY_BRAHMI_JOINING_NUMBER = OT_PLACEHOLDER, /* Don't care. */ |
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112 INDIC_SYLLABIC_CATEGORY_CANTILLATION_MARK = OT_A, |
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113 INDIC_SYLLABIC_CATEGORY_CONSONANT = OT_C, |
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114 INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD = OT_C, |
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115 INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL = OT_CM, |
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116 INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C, |
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117 INDIC_SYLLABIC_CATEGORY_CONSONANT_KILLER = OT_M, /* U+17CD only. */ |
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118 INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_CM, |
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119 INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_PLACEHOLDER, |
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120 INDIC_SYLLABIC_CATEGORY_CONSONANT_PRECEDING_REPHA = OT_Repha, |
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121 INDIC_SYLLABIC_CATEGORY_CONSONANT_PREFIXED = OT_X, /* Don't care. */ |
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122 INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_CM, |
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123 INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA = OT_N, |
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124 INDIC_SYLLABIC_CATEGORY_CONSONANT_WITH_STACKER = OT_Repha, /* TODO */ |
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125 INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK = OT_SM, |
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126 INDIC_SYLLABIC_CATEGORY_INVISIBLE_STACKER = OT_Coeng, |
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127 INDIC_SYLLABIC_CATEGORY_JOINER = OT_ZWJ, |
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128 INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X, |
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129 INDIC_SYLLABIC_CATEGORY_NON_JOINER = OT_ZWNJ, |
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130 INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N, |
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131 INDIC_SYLLABIC_CATEGORY_NUMBER = OT_PLACEHOLDER, |
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132 INDIC_SYLLABIC_CATEGORY_NUMBER_JOINER = OT_PLACEHOLDER, /* Don't care. */ |
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133 INDIC_SYLLABIC_CATEGORY_PURE_KILLER = OT_M, /* Is like a vowel matra. */ |
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134 INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_RS, |
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135 INDIC_SYLLABIC_CATEGORY_SYLLABLE_MODIFIER = OT_M, /* Misc Khmer signs. */ |
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136 INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X, |
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137 INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_N, |
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138 INDIC_SYLLABIC_CATEGORY_VIRAMA = OT_H, |
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139 INDIC_SYLLABIC_CATEGORY_VISARGA = OT_SM, |
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140 INDIC_SYLLABIC_CATEGORY_VOWEL = OT_V, |
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141 INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT = OT_M, |
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142 INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V |
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143 }; |
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144 |
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145 /* Categories used in IndicSMatraCategory.txt from UCD */ |
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146 enum indic_matra_category_t { |
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147 INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_END, |
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148 |
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149 INDIC_MATRA_CATEGORY_LEFT = POS_PRE_C, |
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150 INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_C, |
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151 INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_C, |
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152 INDIC_MATRA_CATEGORY_RIGHT = POS_POST_C, |
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153 |
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154 /* These should resolve to the position of the last part of the split sequence. */ |
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155 INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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156 INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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157 INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_BOTTOM, |
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158 INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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159 INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP, |
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160 INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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161 INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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162 |
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163 INDIC_MATRA_CATEGORY_OVERSTRUCK = POS_AFTER_MAIN, |
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164 INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = POS_PRE_M |
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165 }; |
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166 |
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167 #define INDIC_COMBINE_CATEGORIES(S,M) \ |
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168 ( \ |
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169 ASSERT_STATIC_EXPR_ZERO (S < 255 && M < 255) + \ |
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170 ( S | \ |
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171 ( \ |
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172 ( \ |
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173 S == INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL || \ |
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174 S == INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK || \ |
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175 S == INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER || \ |
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176 S == INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA || \ |
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177 S == INDIC_SYLLABIC_CATEGORY_VIRAMA || \ |
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178 S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT || \ |
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179 false \ |
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180 ? M : INDIC_MATRA_CATEGORY_NOT_APPLICABLE \ |
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181 ) << 8 \ |
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182 ) \ |
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183 ) \ |
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184 ) |
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185 |
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186 HB_INTERNAL INDIC_TABLE_ELEMENT_TYPE |
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187 hb_indic_get_categories (hb_codepoint_t u); |
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188 |
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189 #endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */ |