#include "hb-ot-shape-private.hh" /* XXX Remove */
+/* 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:
OT_ZWJ = 6,
OT_M = 7,
OT_SM = 8,
- OT_VD = 9,
+ /* OT_VD = 9, UNUSED; we use OT_A instead. */
OT_A = 10,
OT_PLACEHOLDER = 11,
OT_DOTTEDCIRCLE = 12,
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_Symbol = 18, /* Avagraha, etc that take marks (SM,A,VD). */
+ OT_CS = 19
};
#define MEDIAL_FLAGS (FLAG (OT_CM))
* 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_Ra) | MEDIAL_FLAGS | FLAG (OT_V) | FLAG (OT_PLACEHOLDER) | FLAG (OT_DOTTEDCIRCLE))
+#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))
-#define HALANT_OR_COENG_FLAGS (FLAG (OT_H) | FLAG (OT_Coeng))
/* Visual positions in a syllable from left to right. */
enum indic_position_t {
- POS_START,
+ POS_START = 0,
- POS_RA_TO_BECOME_REPH,
- POS_PRE_M,
- POS_PRE_C,
+ POS_RA_TO_BECOME_REPH = 1,
+ POS_PRE_M = 2,
+ POS_PRE_C = 3,
- POS_BASE_C,
- POS_AFTER_MAIN,
+ POS_BASE_C = 4,
+ POS_AFTER_MAIN = 5,
- POS_ABOVE_C,
+ POS_ABOVE_C = 6,
- POS_BEFORE_SUB,
- POS_BELOW_C,
- POS_AFTER_SUB,
+ POS_BEFORE_SUB = 7,
+ POS_BELOW_C = 8,
+ POS_AFTER_SUB = 9,
- POS_BEFORE_POST,
- POS_POST_C,
- POS_AFTER_POST,
+ POS_BEFORE_POST = 10,
+ POS_POST_C = 11,
+ POS_AFTER_POST = 12,
- POS_FINAL_C,
- POS_SMVD,
+ POS_FINAL_C = 13,
+ POS_SMVD = 14,
- POS_END
+ POS_END = 15
};
/* Categories used in IndicSyllabicCategory.txt from UCD. */
INDIC_SYLLABIC_CATEGORY_CONSONANT_PREFIXED = OT_X, /* Don't care. */
INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_CM,
INDIC_SYLLABIC_CATEGORY_CONSONANT_SUCCEEDING_REPHA = OT_N,
- INDIC_SYLLABIC_CATEGORY_CONSONANT_WITH_STACKER = OT_Repha, /* TODO */
- INDIC_SYLLABIC_CATEGORY_GEMINATION_MARK = OT_SM,
+ 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_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_M, /* Misc Khmer signs. */
+ 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,
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 */
+};
+
+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 == 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 == 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;
+}
+
+
#endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */
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