190 lines
6.6 KiB
C++
190 lines
6.6 KiB
C++
/*
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* Copyright © 2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH
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#define HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH
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#include "hb-private.hh"
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#include "hb-ot-shape-complex-private.hh"
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#include "hb-ot-shape-private.hh" /* XXX Remove */
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#define INDIC_TABLE_ELEMENT_TYPE uint16_t
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/* Cateories used in the OpenType spec:
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* https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx
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*/
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/* Note: This enum is duplicated in the -machine.rl source file.
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* Not sure how to avoid duplication. */
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enum indic_category_t {
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OT_X = 0,
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OT_C = 1,
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OT_V = 2,
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OT_N = 3,
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OT_H = 4,
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OT_ZWNJ = 5,
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OT_ZWJ = 6,
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OT_M = 7,
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OT_SM = 8,
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OT_VD = 9,
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OT_A = 10,
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OT_PLACEHOLDER = 11,
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OT_DOTTEDCIRCLE = 12,
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OT_RS = 13, /* Register Shifter, used in Khmer OT spec. */
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OT_Coeng = 14, /* Khmer-style Virama. */
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OT_Repha = 15, /* Atomically-encoded logical or visual repha. */
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OT_Ra = 16,
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OT_CM = 17, /* Consonant-Medial. */
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OT_Symbol = 18 /* Avagraha, etc that take marks (SM,A,VD). */
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};
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#define MEDIAL_FLAGS (FLAG (OT_CM))
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/* Note:
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*
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* We treat Vowels and placeholders as if they were consonants. This is safe because Vowels
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* cannot happen in a consonant syllable. The plus side however is, we can call the
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* consonant syllable logic from the vowel syllable function and get it all right! */
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#define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_Ra) | MEDIAL_FLAGS | FLAG (OT_V) | FLAG (OT_PLACEHOLDER) | FLAG (OT_DOTTEDCIRCLE))
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#define JOINER_FLAGS (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ))
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#define HALANT_OR_COENG_FLAGS (FLAG (OT_H) | FLAG (OT_Coeng))
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/* Visual positions in a syllable from left to right. */
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enum indic_position_t {
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POS_START,
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POS_RA_TO_BECOME_REPH,
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POS_PRE_M,
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POS_PRE_C,
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POS_BASE_C,
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POS_AFTER_MAIN,
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POS_ABOVE_C,
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POS_BEFORE_SUB,
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POS_BELOW_C,
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POS_AFTER_SUB,
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POS_BEFORE_POST,
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POS_POST_C,
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POS_AFTER_POST,
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POS_FINAL_C,
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POS_SMVD,
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POS_END
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};
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/* Categories used in IndicSyllabicCategory.txt from UCD. */
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enum indic_syllabic_category_t {
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INDIC_SYLLABIC_CATEGORY_OTHER = OT_X,
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INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_Symbol,
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INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM,
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INDIC_SYLLABIC_CATEGORY_BRAHMI_JOINING_NUMBER = OT_PLACEHOLDER, /* Don't care. */
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INDIC_SYLLABIC_CATEGORY_CANTILLATION_MARK = OT_A,
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INDIC_SYLLABIC_CATEGORY_CONSONANT = OT_C,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD = OT_C,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL = OT_CM,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_KILLER = OT_M, /* U+17CD only. */
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INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_CM,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_PLACEHOLDER,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_PRECEDING_REPHA = OT_Repha,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_PREFIXED = OT_X, /* Don't care. */
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INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_CM,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA = OT_N,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_WITH_STACKER = OT_Repha, /* TODO */
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INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK = OT_SM,
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INDIC_SYLLABIC_CATEGORY_INVISIBLE_STACKER = OT_Coeng,
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INDIC_SYLLABIC_CATEGORY_JOINER = OT_ZWJ,
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INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X,
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INDIC_SYLLABIC_CATEGORY_NON_JOINER = OT_ZWNJ,
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INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N,
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INDIC_SYLLABIC_CATEGORY_NUMBER = OT_PLACEHOLDER,
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INDIC_SYLLABIC_CATEGORY_NUMBER_JOINER = OT_PLACEHOLDER, /* Don't care. */
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INDIC_SYLLABIC_CATEGORY_PURE_KILLER = OT_M, /* Is like a vowel matra. */
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INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_RS,
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INDIC_SYLLABIC_CATEGORY_SYLLABLE_MODIFIER = OT_M, /* Misc Khmer signs. */
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INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X,
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INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_N,
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INDIC_SYLLABIC_CATEGORY_VIRAMA = OT_H,
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INDIC_SYLLABIC_CATEGORY_VISARGA = OT_SM,
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INDIC_SYLLABIC_CATEGORY_VOWEL = OT_V,
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INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT = OT_M,
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INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V
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};
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/* Categories used in IndicSMatraCategory.txt from UCD */
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enum indic_matra_category_t {
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INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_END,
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INDIC_MATRA_CATEGORY_LEFT = POS_PRE_C,
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INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_C,
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INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_C,
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INDIC_MATRA_CATEGORY_RIGHT = POS_POST_C,
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/* These should resolve to the position of the last part of the split sequence. */
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INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_BOTTOM,
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INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP,
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_OVERSTRUCK = POS_AFTER_MAIN,
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INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = POS_PRE_M
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};
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#define INDIC_COMBINE_CATEGORIES(S,M) \
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( \
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ASSERT_STATIC_EXPR_ZERO (S < 255 && M < 255) + \
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( S | \
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( \
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( \
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S == INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL || \
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S == INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK || \
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S == INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER || \
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S == INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA || \
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S == INDIC_SYLLABIC_CATEGORY_VIRAMA || \
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S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT || \
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false \
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? M : INDIC_MATRA_CATEGORY_NOT_APPLICABLE \
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) << 8 \
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) \
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) \
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)
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HB_INTERNAL INDIC_TABLE_ELEMENT_TYPE
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hb_indic_get_categories (hb_codepoint_t u);
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#endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */
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