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-/*
- * Copyright © 2012 Google, Inc.
- *
- * This is part of HarfBuzz, a text shaping library.
- *
- * Permission is hereby granted, without written agreement and without
- * license or royalty fees, to use, copy, modify, and distribute this
- * software and its documentation for any purpose, provided that the
- * above copyright notice and the following two paragraphs appear in
- * all copies of this software.
- *
- * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
- * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
- * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
- * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
- * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
- * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
- * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
- *
- * Google Author(s): Behdad Esfahbod
- */
-
-#ifndef HB_OT_SHAPE_COMPLEX_INDIC_HH
-#define HB_OT_SHAPE_COMPLEX_INDIC_HH
-
-#include "hb.hh"
-
-#include "hb-ot-shape-complex.hh"
-
-
-/* buffer var allocations */
-#define indic_category() complex_var_u8_0() /* indic_category_t */
-#define indic_position() complex_var_u8_1() /* indic_position_t */
-
-
-#define INDIC_TABLE_ELEMENT_TYPE uint16_t
-
-/* Cateories used in the OpenType spec:
- * https://docs.microsoft.com/en-us/typography/script-development/devanagari
- */
-/* Note: This enum is duplicated in the -machine.rl source file.
- * Not sure how to avoid duplication. */
-enum indic_category_t {
- OT_X = 0,
- OT_C = 1,
- OT_V = 2,
- OT_N = 3,
- OT_H = 4,
- OT_ZWNJ = 5,
- OT_ZWJ = 6,
- OT_M = 7,
- OT_SM = 8,
- /* OT_VD = 9, UNUSED; we use OT_A instead. */
- OT_A = 10,
- OT_PLACEHOLDER = 11,
- OT_DOTTEDCIRCLE = 12,
- OT_RS = 13, /* Register Shifter, used in Khmer OT spec. */
- OT_Coeng = 14, /* Khmer-style Virama. */
- OT_Repha = 15, /* Atomically-encoded logical or visual repha. */
- OT_Ra = 16,
- OT_CM = 17, /* Consonant-Medial. */
- OT_Symbol = 18, /* Avagraha, etc that take marks (SM,A,VD). */
- OT_CS = 19,
-
- /* The following are used by Khmer & Myanmar shapers. Defined
- * here for them to share. */
- OT_VAbv = 26,
- OT_VBlw = 27,
- OT_VPre = 28,
- OT_VPst = 29,
-};
-
-#define MEDIAL_FLAGS (FLAG (OT_CM))
-
-/* Note:
- *
- * We treat Vowels and placeholders as if they were consonants. This is safe because Vowels
- * cannot happen in a consonant syllable. The plus side however is, we can call the
- * consonant syllable logic from the vowel syllable function and get it all right! */
-#define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_CS) | FLAG (OT_Ra) | MEDIAL_FLAGS | FLAG (OT_V) | FLAG (OT_PLACEHOLDER) | FLAG (OT_DOTTEDCIRCLE))
-#define JOINER_FLAGS (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ))
-
-
-/* Visual positions in a syllable from left to right. */
-enum indic_position_t {
- POS_START = 0,
-
- POS_RA_TO_BECOME_REPH = 1,
- POS_PRE_M = 2,
- POS_PRE_C = 3,
-
- POS_BASE_C = 4,
- POS_AFTER_MAIN = 5,
-
- POS_ABOVE_C = 6,
-
- POS_BEFORE_SUB = 7,
- POS_BELOW_C = 8,
- POS_AFTER_SUB = 9,
-
- POS_BEFORE_POST = 10,
- POS_POST_C = 11,
- POS_AFTER_POST = 12,
-
- POS_FINAL_C = 13,
- POS_SMVD = 14,
-
- POS_END = 15
-};
-
-/* Categories used in IndicSyllabicCategory.txt from UCD. */
-enum indic_syllabic_category_t {
- INDIC_SYLLABIC_CATEGORY_OTHER = OT_X,
-
- INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_Symbol,
- INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM,
- INDIC_SYLLABIC_CATEGORY_BRAHMI_JOINING_NUMBER = OT_PLACEHOLDER, /* Don't care. */
- INDIC_SYLLABIC_CATEGORY_CANTILLATION_MARK = OT_A,
- INDIC_SYLLABIC_CATEGORY_CONSONANT = OT_C,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD = OT_C,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL = OT_CM,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_KILLER = OT_M, /* U+17CD only. */
- INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_CM,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_PLACEHOLDER,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_PRECEDING_REPHA = OT_Repha,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_PREFIXED = OT_X, /* Don't care. */
- INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_CM,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA = OT_CM,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_WITH_STACKER = OT_CS,
- INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK = OT_SM, /* https://github.com/harfbuzz/harfbuzz/issues/552 */
- INDIC_SYLLABIC_CATEGORY_INVISIBLE_STACKER = OT_Coeng,
- INDIC_SYLLABIC_CATEGORY_JOINER = OT_ZWJ,
- INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X,
- INDIC_SYLLABIC_CATEGORY_NON_JOINER = OT_ZWNJ,
- INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N,
- INDIC_SYLLABIC_CATEGORY_NUMBER = OT_PLACEHOLDER,
- INDIC_SYLLABIC_CATEGORY_NUMBER_JOINER = OT_PLACEHOLDER, /* Don't care. */
- INDIC_SYLLABIC_CATEGORY_PURE_KILLER = OT_M, /* Is like a vowel matra. */
- INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_RS,
- INDIC_SYLLABIC_CATEGORY_SYLLABLE_MODIFIER = OT_SM,
- INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X,
- INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_N,
- INDIC_SYLLABIC_CATEGORY_VIRAMA = OT_H,
- INDIC_SYLLABIC_CATEGORY_VISARGA = OT_SM,
- INDIC_SYLLABIC_CATEGORY_VOWEL = OT_V,
- INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT = OT_M,
- INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V
-};
-
-/* Categories used in IndicSMatraCategory.txt from UCD */
-enum indic_matra_category_t {
- INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_END,
-
- INDIC_MATRA_CATEGORY_LEFT = POS_PRE_C,
- INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_C,
- INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_C,
- INDIC_MATRA_CATEGORY_RIGHT = POS_POST_C,
-
- /* These should resolve to the position of the last part of the split sequence. */
- INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
- INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
- INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_BOTTOM,
- INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
- INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP,
- INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
- INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
-
- INDIC_MATRA_CATEGORY_OVERSTRUCK = POS_AFTER_MAIN,
- INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = POS_PRE_M
-};
-
-#define INDIC_COMBINE_CATEGORIES(S,M) \
- ( \
- ASSERT_STATIC_EXPR_ZERO (S < 255 && M < 255) + \
- ( S | \
- ( \
- ( \
- S == INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL || \
- S == INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK || \
- S == INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER || \
- S == INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA || \
- S == INDIC_SYLLABIC_CATEGORY_VIRAMA || \
- S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT || \
- false \
- ? M : INDIC_MATRA_CATEGORY_NOT_APPLICABLE \
- ) << 8 \
- ) \
- ) \
- )
-
-HB_INTERNAL INDIC_TABLE_ELEMENT_TYPE
-hb_indic_get_categories (hb_codepoint_t u);
-
-
-static inline bool
-is_one_of (const hb_glyph_info_t &info, unsigned int flags)
-{
- /* If it ligated, all bets are off. */
- if (_hb_glyph_info_ligated (&info)) return false;
- return !!(FLAG_UNSAFE (info.indic_category()) & flags);
-}
-
-static inline bool
-is_joiner (const hb_glyph_info_t &info)
-{
- return is_one_of (info, JOINER_FLAGS);
-}
-
-static inline bool
-is_consonant (const hb_glyph_info_t &info)
-{
- return is_one_of (info, CONSONANT_FLAGS);
-}
-
-static inline bool
-is_halant (const hb_glyph_info_t &info)
-{
- return is_one_of (info, FLAG (OT_H));
-}
-
-#define IN_HALF_BLOCK(u, Base) (((u) & ~0x7Fu) == (Base))
-
-#define IS_DEVA(u) (IN_HALF_BLOCK (u, 0x0900u))
-#define IS_BENG(u) (IN_HALF_BLOCK (u, 0x0980u))
-#define IS_GURU(u) (IN_HALF_BLOCK (u, 0x0A00u))
-#define IS_GUJR(u) (IN_HALF_BLOCK (u, 0x0A80u))
-#define IS_ORYA(u) (IN_HALF_BLOCK (u, 0x0B00u))
-#define IS_TAML(u) (IN_HALF_BLOCK (u, 0x0B80u))
-#define IS_TELU(u) (IN_HALF_BLOCK (u, 0x0C00u))
-#define IS_KNDA(u) (IN_HALF_BLOCK (u, 0x0C80u))
-#define IS_MLYM(u) (IN_HALF_BLOCK (u, 0x0D00u))
-#define IS_SINH(u) (IN_HALF_BLOCK (u, 0x0D80u))
-
-
-#define MATRA_POS_LEFT(u) POS_PRE_M
-#define MATRA_POS_RIGHT(u) ( \
- IS_DEVA(u) ? POS_AFTER_SUB : \
- IS_BENG(u) ? POS_AFTER_POST : \
- IS_GURU(u) ? POS_AFTER_POST : \
- IS_GUJR(u) ? POS_AFTER_POST : \
- IS_ORYA(u) ? POS_AFTER_POST : \
- IS_TAML(u) ? POS_AFTER_POST : \
- IS_TELU(u) ? (u <= 0x0C42u ? POS_BEFORE_SUB : POS_AFTER_SUB) : \
- IS_KNDA(u) ? (u < 0x0CC3u || u > 0xCD6u ? POS_BEFORE_SUB : POS_AFTER_SUB) : \
- IS_MLYM(u) ? POS_AFTER_POST : \
- IS_SINH(u) ? POS_AFTER_SUB : \
- /*default*/ POS_AFTER_SUB \
- )
-#define MATRA_POS_TOP(u) ( /* BENG and MLYM don't have top matras. */ \
- IS_DEVA(u) ? POS_AFTER_SUB : \
- IS_GURU(u) ? POS_AFTER_POST : /* Deviate from spec */ \
- IS_GUJR(u) ? POS_AFTER_SUB : \
- IS_ORYA(u) ? POS_AFTER_MAIN : \
- IS_TAML(u) ? POS_AFTER_SUB : \
- IS_TELU(u) ? POS_BEFORE_SUB : \
- IS_KNDA(u) ? POS_BEFORE_SUB : \
- IS_SINH(u) ? POS_AFTER_SUB : \
- /*default*/ POS_AFTER_SUB \
- )
-#define MATRA_POS_BOTTOM(u) ( \
- IS_DEVA(u) ? POS_AFTER_SUB : \
- IS_BENG(u) ? POS_AFTER_SUB : \
- IS_GURU(u) ? POS_AFTER_POST : \
- IS_GUJR(u) ? POS_AFTER_POST : \
- IS_ORYA(u) ? POS_AFTER_SUB : \
- IS_TAML(u) ? POS_AFTER_POST : \
- IS_TELU(u) ? POS_BEFORE_SUB : \
- IS_KNDA(u) ? POS_BEFORE_SUB : \
- IS_MLYM(u) ? POS_AFTER_POST : \
- IS_SINH(u) ? POS_AFTER_SUB : \
- /*default*/ POS_AFTER_SUB \
- )
-
-static inline indic_position_t
-matra_position_indic (hb_codepoint_t u, indic_position_t side)
-{
- switch ((int) side)
- {
- case POS_PRE_C: return MATRA_POS_LEFT (u);
- case POS_POST_C: return MATRA_POS_RIGHT (u);
- case POS_ABOVE_C: return MATRA_POS_TOP (u);
- case POS_BELOW_C: return MATRA_POS_BOTTOM (u);
- }
- return side;
-}
-
-/* XXX
- * This is a hack for now. We should move this data into the main Indic table.
- * Or completely remove it and just check in the tables.
- */
-static const hb_codepoint_t ra_chars[] = {
- 0x0930u, /* Devanagari */
- 0x09B0u, /* Bengali */
- 0x09F0u, /* Bengali */
- 0x0A30u, /* Gurmukhi */ /* No Reph */
- 0x0AB0u, /* Gujarati */
- 0x0B30u, /* Oriya */
- 0x0BB0u, /* Tamil */ /* No Reph */
- 0x0C30u, /* Telugu */ /* Reph formed only with ZWJ */
- 0x0CB0u, /* Kannada */
- 0x0D30u, /* Malayalam */ /* No Reph, Logical Repha */
-
- 0x0DBBu, /* Sinhala */ /* Reph formed only with ZWJ */
-
- 0x179Au, /* Khmer */
-};
-
-static inline bool
-is_ra (hb_codepoint_t u)
-{
- for (unsigned int i = 0; i < ARRAY_LENGTH (ra_chars); i++)
- if (u == ra_chars[i])
- return true;
- return false;
-}
-
-static inline void
-set_indic_properties (hb_glyph_info_t &info)
-{
- hb_codepoint_t u = info.codepoint;
- unsigned int type = hb_indic_get_categories (u);
- indic_category_t cat = (indic_category_t) (type & 0x7Fu);
- indic_position_t pos = (indic_position_t) (type >> 8);
-
-
- /*
- * Re-assign category
- */
-
- /* The following act more like the Bindus. */
- if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x0953u, 0x0954u)))
- cat = OT_SM;
- /* The following act like consonants. */
- else if (unlikely (hb_in_ranges<hb_codepoint_t> (u, 0x0A72u, 0x0A73u,
- 0x1CF5u, 0x1CF6u)))
- cat = OT_C;
- /* TODO: The following should only be allowed after a Visarga.
- * For now, just treat them like regular tone marks. */
- else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x1CE2u, 0x1CE8u)))
- cat = OT_A;
- /* TODO: The following should only be allowed after some of
- * the nasalization marks, maybe only for U+1CE9..U+1CF1.
- * For now, just treat them like tone marks. */
- else if (unlikely (u == 0x1CEDu))
- cat = OT_A;
- /* The following take marks in standalone clusters, similar to Avagraha. */
- else if (unlikely (hb_in_ranges<hb_codepoint_t> (u, 0xA8F2u, 0xA8F7u,
- 0x1CE9u, 0x1CECu,
- 0x1CEEu, 0x1CF1u)))
- {
- cat = OT_Symbol;
- static_assert (((int) INDIC_SYLLABIC_CATEGORY_AVAGRAHA == OT_Symbol), "");
- }
- else if (unlikely (u == 0x0A51u))
- {
- /* https://github.com/harfbuzz/harfbuzz/issues/524 */
- cat = OT_M;
- pos = POS_BELOW_C;
- }
-
- /* According to ScriptExtensions.txt, these Grantha marks may also be used in Tamil,
- * so the Indic shaper needs to know their categories. */
- else if (unlikely (u == 0x11301u || u == 0x11303u)) cat = OT_SM;
- else if (unlikely (u == 0x1133Bu || u == 0x1133Cu)) cat = OT_N;
-
- else if (unlikely (u == 0x0AFBu)) cat = OT_N; /* https://github.com/harfbuzz/harfbuzz/issues/552 */
-
- else if (unlikely (u == 0x0980u)) cat = OT_PLACEHOLDER; /* https://github.com/harfbuzz/harfbuzz/issues/538 */
- else if (unlikely (u == 0x09FCu)) cat = OT_PLACEHOLDER; /* https://github.com/harfbuzz/harfbuzz/pull/1613 */
- else if (unlikely (u == 0x0C80u)) cat = OT_PLACEHOLDER; /* https://github.com/harfbuzz/harfbuzz/pull/623 */
- else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x2010u, 0x2011u)))
- cat = OT_PLACEHOLDER;
- else if (unlikely (u == 0x25CCu)) cat = OT_DOTTEDCIRCLE;
-
-
- /*
- * Re-assign position.
- */
-
- if ((FLAG_UNSAFE (cat) & CONSONANT_FLAGS))
- {
- pos = POS_BASE_C;
- if (is_ra (u))
- cat = OT_Ra;
- }
- else if (cat == OT_M)
- {
- pos = matra_position_indic (u, pos);
- }
- else if ((FLAG_UNSAFE (cat) & (FLAG (OT_SM) /* | FLAG (OT_VD) */ | FLAG (OT_A) | FLAG (OT_Symbol))))
- {
- pos = POS_SMVD;
- }
-
- if (unlikely (u == 0x0B01u)) pos = POS_BEFORE_SUB; /* Oriya Bindu is BeforeSub in the spec. */
-
-
-
- info.indic_category() = cat;
- info.indic_position() = pos;
-}
-
-struct hb_indic_would_substitute_feature_t
-{
- void init (const hb_ot_map_t *map, hb_tag_t feature_tag, bool zero_context_)
- {
- zero_context = zero_context_;
- map->get_stage_lookups (0/*GSUB*/,
- map->get_feature_stage (0/*GSUB*/, feature_tag),
- &lookups, &count);
- }
-
- bool would_substitute (const hb_codepoint_t *glyphs,
- unsigned int glyphs_count,
- hb_face_t *face) const
- {
- for (unsigned int i = 0; i < count; i++)
- if (hb_ot_layout_lookup_would_substitute (face, lookups[i].index, glyphs, glyphs_count, zero_context))
- return true;
- return false;
- }
-
- private:
- const hb_ot_map_t::lookup_map_t *lookups;
- unsigned int count;
- bool zero_context;
-};
-
-
-#endif /* HB_OT_SHAPE_COMPLEX_INDIC_HH */