1 /* 2 * Copyright © 2012 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27 #ifndef HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH 28 #define HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH 29 30 #include "hb-private.hh" 31 32 33 #include "hb-ot-shape-complex-private.hh" 34 #include "hb-ot-shape-private.hh" /* XXX Remove */ 35 36 37 #define INDIC_TABLE_ELEMENT_TYPE uint16_t 38 39 /* Cateories used in the OpenType spec: 40 * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx 41 */ 42 /* Note: This enum is duplicated in the -machine.rl source file. 43 * Not sure how to avoid duplication. */ 44 enum indic_category_t { 45 OT_X = 0, 46 OT_C = 1, 47 OT_V = 2, 48 OT_N = 3, 49 OT_H = 4, 50 OT_ZWNJ = 5, 51 OT_ZWJ = 6, 52 OT_M = 7, 53 OT_SM = 8, 54 OT_VD = 9, 55 OT_A = 10, 56 OT_PLACEHOLDER = 11, 57 OT_DOTTEDCIRCLE = 12, 58 OT_RS = 13, /* Register Shifter, used in Khmer OT spec. */ 59 OT_Coeng = 14, /* Khmer-style Virama. */ 60 OT_Repha = 15, /* Atomically-encoded logical or visual repha. */ 61 OT_Ra = 16, 62 OT_CM = 17, /* Consonant-Medial. */ 63 OT_Symbol = 18, /* Avagraha, etc that take marks (SM,A,VD). */ 64 OT_CM2 = 31 /* Consonant-Medial, second slot. */ 65 }; 66 67 #define MEDIAL_FLAGS (FLAG (OT_CM) | FLAG (OT_CM2)) 68 69 /* Note: 70 * 71 * We treat Vowels and placeholders as if they were consonants. This is safe because Vowels 72 * cannot happen in a consonant syllable. The plus side however is, we can call the 73 * consonant syllable logic from the vowel syllable function and get it all right! */ 74 #define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_Ra) | MEDIAL_FLAGS | FLAG (OT_V) | FLAG (OT_PLACEHOLDER) | FLAG (OT_DOTTEDCIRCLE)) 75 #define JOINER_FLAGS (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ)) 76 #define HALANT_OR_COENG_FLAGS (FLAG (OT_H) | FLAG (OT_Coeng)) 77 78 79 /* Visual positions in a syllable from left to right. */ 80 enum indic_position_t { 81 POS_START, 82 83 POS_RA_TO_BECOME_REPH, 84 POS_PRE_M, 85 POS_PRE_C, 86 87 POS_BASE_C, 88 POS_AFTER_MAIN, 89 90 POS_ABOVE_C, 91 92 POS_BEFORE_SUB, 93 POS_BELOW_C, 94 POS_AFTER_SUB, 95 96 POS_BEFORE_POST, 97 POS_POST_C, 98 POS_AFTER_POST, 99 100 POS_FINAL_C, 101 POS_SMVD, 102 103 POS_END 104 }; 105 106 /* Categories used in IndicSyllabicCategory.txt from UCD. */ 107 enum indic_syllabic_category_t { 108 INDIC_SYLLABIC_CATEGORY_OTHER = OT_X, 109 110 INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_Symbol, 111 INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM, 112 INDIC_SYLLABIC_CATEGORY_BRAHMI_JOINING_NUMBER = OT_PLACEHOLDER, /* TODO */ 113 INDIC_SYLLABIC_CATEGORY_CANTILLATION_MARK = OT_A, 114 INDIC_SYLLABIC_CATEGORY_CONSONANT = OT_C, 115 INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD = OT_C, 116 INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL = OT_CM, 117 INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C, 118 INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_CM, 119 INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_PLACEHOLDER, 120 INDIC_SYLLABIC_CATEGORY_CONSONANT_PRECEDING_REPHA = OT_Repha, 121 INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_CM, 122 INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA = OT_N, 123 INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK = OT_SM, 124 INDIC_SYLLABIC_CATEGORY_INVISIBLE_STACKER = OT_H, /* TODO */ 125 INDIC_SYLLABIC_CATEGORY_JOINER = OT_ZWJ, 126 INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X, 127 INDIC_SYLLABIC_CATEGORY_NON_JOINER = OT_ZWNJ, 128 INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N, 129 INDIC_SYLLABIC_CATEGORY_NUMBER = OT_PLACEHOLDER, 130 INDIC_SYLLABIC_CATEGORY_NUMBER_JOINER = OT_PLACEHOLDER, /* TODO */ 131 INDIC_SYLLABIC_CATEGORY_PURE_KILLER = OT_H, /* TODO */ 132 INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_RS, 133 INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X, 134 INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_N, 135 INDIC_SYLLABIC_CATEGORY_VIRAMA = OT_H, 136 INDIC_SYLLABIC_CATEGORY_VISARGA = OT_SM, 137 INDIC_SYLLABIC_CATEGORY_VOWEL = OT_V, 138 INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT = OT_M, 139 INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V 140 }; 141 142 /* Categories used in IndicSMatraCategory.txt from UCD */ 143 enum indic_matra_category_t { 144 INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_END, 145 146 INDIC_MATRA_CATEGORY_LEFT = POS_PRE_C, 147 INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_C, 148 INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_C, 149 INDIC_MATRA_CATEGORY_RIGHT = POS_POST_C, 150 151 /* These should resolve to the position of the last part of the split sequence. */ 152 INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 153 INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 154 INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_BOTTOM, 155 INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 156 INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP, 157 INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 158 INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 159 160 INDIC_MATRA_CATEGORY_OVERSTRUCK = POS_AFTER_MAIN, 161 INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = POS_PRE_M 162 }; 163 164 /* Note: We use ASSERT_STATIC_EXPR_ZERO() instead of ASSERT_STATIC_EXPR() and the comma operation 165 * because gcc fails to optimize the latter and fills the table in at runtime. */ 166 #define INDIC_COMBINE_CATEGORIES(S,M) \ 167 (ASSERT_STATIC_EXPR_ZERO (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || \ 168 ( \ 169 S == INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL || \ 170 S == INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK || \ 171 S == INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER || \ 172 S == INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA || \ 173 S == INDIC_SYLLABIC_CATEGORY_VIRAMA || \ 174 S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT || \ 175 false)) + \ 176 ASSERT_STATIC_EXPR_ZERO (S < 255 && M < 255) + \ 177 ((M << 8) | S)) 178 179 HB_INTERNAL INDIC_TABLE_ELEMENT_TYPE 180 hb_indic_get_categories (hb_codepoint_t u); 181 182 #endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */ 183