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_NBSP = 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_Avag = 18, /* Avagraha. */ 64 OT_CM2 = 31 /* Consonant-Medial, second slot. */ 65 }; 66 67 /* Visual positions in a syllable from left to right. */ 68 enum indic_position_t { 69 POS_START, 70 71 POS_RA_TO_BECOME_REPH, 72 POS_PRE_M, 73 POS_PRE_C, 74 75 POS_BASE_C, 76 POS_AFTER_MAIN, 77 78 POS_ABOVE_C, 79 80 POS_BEFORE_SUB, 81 POS_BELOW_C, 82 POS_AFTER_SUB, 83 84 POS_BEFORE_POST, 85 POS_POST_C, 86 POS_AFTER_POST, 87 88 POS_FINAL_C, 89 POS_SMVD, 90 91 POS_END 92 }; 93 94 /* Categories used in IndicSyllabicCategory.txt from UCD. */ 95 enum indic_syllabic_category_t { 96 INDIC_SYLLABIC_CATEGORY_OTHER = OT_X, 97 98 INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_Avag, 99 INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM, 100 INDIC_SYLLABIC_CATEGORY_CONSONANT = OT_C, 101 INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD = OT_C, 102 INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL = OT_CM, 103 INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C, 104 INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_CM, 105 INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_NBSP, 106 INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_CM, 107 INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA = OT_Repha, 108 INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X, 109 INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N, 110 INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_RS, 111 INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X, 112 INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_N, 113 INDIC_SYLLABIC_CATEGORY_VIRAMA = OT_H, 114 INDIC_SYLLABIC_CATEGORY_VISARGA = OT_SM, 115 INDIC_SYLLABIC_CATEGORY_VOWEL = OT_V, 116 INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT = OT_M, 117 INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V 118 }; 119 120 /* Categories used in IndicSMatraCategory.txt from UCD */ 121 enum indic_matra_category_t { 122 INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_END, 123 124 INDIC_MATRA_CATEGORY_LEFT = POS_PRE_C, 125 INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_C, 126 INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_C, 127 INDIC_MATRA_CATEGORY_RIGHT = POS_POST_C, 128 129 /* These should resolve to the position of the last part of the split sequence. */ 130 INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 131 INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 132 INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_BOTTOM, 133 INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 134 INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP, 135 INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 136 INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 137 138 INDIC_MATRA_CATEGORY_INVISIBLE = INDIC_MATRA_CATEGORY_NOT_APPLICABLE, 139 INDIC_MATRA_CATEGORY_OVERSTRUCK = POS_AFTER_MAIN, 140 INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = POS_PRE_M 141 }; 142 143 /* Note: We use ASSERT_STATIC_EXPR_ZERO() instead of ASSERT_STATIC_EXPR() and the comma operation 144 * because gcc fails to optimize the latter and fills the table in at runtime. */ 145 #define INDIC_COMBINE_CATEGORIES(S,M) \ 146 (ASSERT_STATIC_EXPR_ZERO (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)) + \ 147 ASSERT_STATIC_EXPR_ZERO (S < 255 && M < 255) + \ 148 ((M << 8) | S)) 149 150 HB_INTERNAL INDIC_TABLE_ELEMENT_TYPE 151 hb_indic_get_categories (hb_codepoint_t u); 152 153 #endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */ 154
