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, 47 OT_V, 48 OT_N, 49 OT_H, 50 OT_ZWNJ, 51 OT_ZWJ, 52 OT_M, 53 OT_SM, 54 OT_VD, 55 OT_A, 56 OT_NBSP, 57 OT_DOTTEDCIRCLE, /* Not in the spec, but special in Uniscribe. /Very very/ special! */ 58 OT_RS, /* Register Shifter, used in Khmer OT spec */ 59 OT_Coeng, 60 OT_Repha, 61 OT_Ra, /* Not explicitly listed in the OT spec, but used in the grammar. */ 62 OT_CM 63 }; 64 65 /* Visual positions in a syllable from left to right. */ 66 enum indic_position_t { 67 POS_START, 68 69 POS_RA_TO_BECOME_REPH, 70 POS_PRE_M, 71 POS_PRE_C, 72 73 POS_BASE_C, 74 POS_AFTER_MAIN, 75 76 POS_ABOVE_C, 77 78 POS_BEFORE_SUB, 79 POS_BELOW_C, 80 POS_AFTER_SUB, 81 82 POS_BEFORE_POST, 83 POS_POST_C, 84 POS_AFTER_POST, 85 86 POS_FINAL_C, 87 POS_SMVD, 88 89 POS_END 90 }; 91 92 /* Categories used in IndicSyllabicCategory.txt from UCD. */ 93 enum indic_syllabic_category_t { 94 INDIC_SYLLABIC_CATEGORY_OTHER = OT_X, 95 96 INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_X, 97 INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM, 98 INDIC_SYLLABIC_CATEGORY_CONSONANT = OT_C, 99 INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD = OT_C, 100 INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL = OT_CM, 101 INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C, 102 INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_CM, 103 INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_NBSP, 104 INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_C, 105 INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA = OT_Repha, 106 INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X, 107 INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N, 108 INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_RS, 109 INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X, 110 INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_N, 111 INDIC_SYLLABIC_CATEGORY_VIRAMA = OT_H, 112 INDIC_SYLLABIC_CATEGORY_VISARGA = OT_SM, 113 INDIC_SYLLABIC_CATEGORY_VOWEL = OT_V, 114 INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT = OT_M, 115 INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V 116 }; 117 118 /* Categories used in IndicSMatraCategory.txt from UCD */ 119 enum indic_matra_category_t { 120 INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_END, 121 122 INDIC_MATRA_CATEGORY_LEFT = POS_PRE_C, 123 INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_C, 124 INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_C, 125 INDIC_MATRA_CATEGORY_RIGHT = POS_POST_C, 126 127 /* These should resolve to the position of the last part of the split sequence. */ 128 INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 129 INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 130 INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_BOTTOM, 131 INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 132 INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP, 133 INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 134 INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, 135 136 INDIC_MATRA_CATEGORY_INVISIBLE = INDIC_MATRA_CATEGORY_NOT_APPLICABLE, 137 INDIC_MATRA_CATEGORY_OVERSTRUCK = POS_AFTER_MAIN, 138 INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = POS_PRE_M 139 }; 140 141 /* Note: We use ASSERT_STATIC_EXPR_ZERO() instead of ASSERT_STATIC_EXPR() and the comma operation 142 * because gcc fails to optimize the latter and fills the table in at runtime. */ 143 #define INDIC_COMBINE_CATEGORIES(S,M) \ 144 (ASSERT_STATIC_EXPR_ZERO (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)) + \ 145 ASSERT_STATIC_EXPR_ZERO (S < 255 && M < 255) + \ 146 ((M << 8) | S)) 147 148 HB_INTERNAL INDIC_TABLE_ELEMENT_TYPE 149 hb_indic_get_categories (hb_codepoint_t u); 150 151 #endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */ 152