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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_PRIVATE_HH
#define HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH
#include "hb-private.hh"
#include "hb-ot-shape-complex-private.hh"
/* buffer var allocations */
#define indic_category() complex_var_persistent_u8_0() /* indic_category_t */
#define indic_position() complex_var_persistent_u8_1() /* indic_matra_category_t */
#define IN_HALF_BLOCK(u, Base) (((u) & ~0x7F) == (Base))
#define IS_DEVA(u) (IN_HALF_BLOCK (u, 0x900))
#define IS_BENG(u) (IN_HALF_BLOCK (u, 0x980))
#define IS_GURM(u) (IN_HALF_BLOCK (u, 0xA00))
#define IS_GUJA(u) (IN_HALF_BLOCK (u, 0xA80))
#define IS_ORYA(u) (IN_HALF_BLOCK (u, 0xB00))
#define IS_TAML(u) (IN_HALF_BLOCK (u, 0xB80))
#define IS_TELU(u) (IN_HALF_BLOCK (u, 0xC00))
#define IS_KNDA(u) (IN_HALF_BLOCK (u, 0xC80))
#define IS_MLYM(u) (IN_HALF_BLOCK (u, 0xD00))
#define IS_SINH(u) (IN_HALF_BLOCK (u, 0xD80))
#define INDIC_TABLE_ELEMENT_TYPE uint8_t
/* Cateories used in the OpenType spec:
* https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx
*/
/* 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,
OT_V,
OT_N,
OT_H,
OT_ZWNJ,
OT_ZWJ,
OT_M,
OT_SM,
OT_VD,
OT_A,
OT_NBSP,
OT_DOTTEDCIRCLE, /* Not in the spec, but special in Uniscribe. /Very very/ special! */
OT_RS, /* Register Shifter, used in Khmer OT spec */
OT_Coeng,
OT_Repha,
OT_Ra /* Not explicitly listed in the OT spec, but used in the grammar. */
};
/* Visual positions in a syllable from left to right. */
enum indic_position_t {
POS_RA_TO_BECOME_REPH,
POS_PRE_M,
POS_PRE_C,
POS_BASE_C,
POS_AFTER_MAIN,
POS_ABOVE_C,
POS_BEFORE_SUB,
POS_BELOW_C,
POS_AFTER_SUB,
POS_BEFORE_POST,
POS_POST_C,
POS_AFTER_POST,
POS_FINAL_C,
POS_SMVD,
POS_END
};
/* Categories used in IndicSyllabicCategory.txt from UCD. */
enum indic_syllabic_category_t {
INDIC_SYLLABIC_CATEGORY_OTHER = OT_X,
INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_X,
INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM,
INDIC_SYLLABIC_CATEGORY_CONSONANT = OT_C,
INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD = OT_C,
INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL = OT_C,
INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C,
INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_C,
INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_NBSP,
INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_C,
INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA = OT_Repha,
INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X,
INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N,
INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_RS,
INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X,
INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_X,
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_BASE_C,
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_INVISIBLE = INDIC_MATRA_CATEGORY_NOT_APPLICABLE,
INDIC_MATRA_CATEGORY_OVERSTRUCK = INDIC_MATRA_CATEGORY_NOT_APPLICABLE,
INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = INDIC_MATRA_CATEGORY_NOT_APPLICABLE
};
/* Note: We use ASSERT_STATIC_EXPR_ZERO() instead of ASSERT_STATIC_EXPR() and the comma operation
* because gcc fails to optimize the latter and fills the table in at runtime. */
#define INDIC_COMBINE_CATEGORIES(S,M) \
(ASSERT_STATIC_EXPR_ZERO (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)) + \
ASSERT_STATIC_EXPR_ZERO (S < 16 && M < 16) + \
((M << 4) | S))
#include "hb-ot-shape-complex-indic-table.hh"
/* XXX
* This is a hack for now. We should:
* 1. Move this data into the main Indic table,
* and/or
* 2. Probe font lookups to determine consonant positions.
*/
static const struct consonant_position_t {
hb_codepoint_t u;
indic_position_t position;
} consonant_positions[] = {
{0x0930, POS_BELOW_C},
{0x09AC, POS_BELOW_C},
{0x09AF, POS_POST_C},
{0x09B0, POS_BELOW_C},
{0x09F0, POS_BELOW_C},
{0x0A2F, POS_POST_C},
{0x0A30, POS_BELOW_C},
{0x0A35, POS_BELOW_C},
{0x0A39, POS_BELOW_C},
{0x0AB0, POS_BELOW_C},
{0x0B24, POS_BELOW_C},
{0x0B28, POS_BELOW_C},
{0x0B2C, POS_BELOW_C},
{0x0B2D, POS_BELOW_C},
{0x0B2E, POS_BELOW_C},
{0x0B2F, POS_POST_C},
{0x0B30, POS_BELOW_C},
{0x0B32, POS_BELOW_C},
{0x0B33, POS_BELOW_C},
{0x0B5F, POS_POST_C},
{0x0B71, POS_BELOW_C},
{0x0C15, POS_BELOW_C},
{0x0C16, POS_BELOW_C},
{0x0C17, POS_BELOW_C},
{0x0C18, POS_BELOW_C},
{0x0C19, POS_BELOW_C},
{0x0C1A, POS_BELOW_C},
{0x0C1B, POS_BELOW_C},
{0x0C1C, POS_BELOW_C},
{0x0C1D, POS_BELOW_C},
{0x0C1E, POS_BELOW_C},
{0x0C1F, POS_BELOW_C},
{0x0C20, POS_BELOW_C},
{0x0C21, POS_BELOW_C},
{0x0C22, POS_BELOW_C},
{0x0C23, POS_BELOW_C},
{0x0C24, POS_BELOW_C},
{0x0C25, POS_BELOW_C},
{0x0C26, POS_BELOW_C},
{0x0C27, POS_BELOW_C},
{0x0C28, POS_BELOW_C},
{0x0C2A, POS_BELOW_C},
{0x0C2B, POS_BELOW_C},
{0x0C2C, POS_BELOW_C},
{0x0C2D, POS_BELOW_C},
{0x0C2E, POS_BELOW_C},
{0x0C2F, POS_BELOW_C},
{0x0C30, POS_BELOW_C},
{0x0C32, POS_BELOW_C},
{0x0C33, POS_BELOW_C},
{0x0C35, POS_BELOW_C},
{0x0C36, POS_BELOW_C},
{0x0C37, POS_BELOW_C},
{0x0C38, POS_BELOW_C},
{0x0C39, POS_BELOW_C},
{0x0C95, POS_BELOW_C},
{0x0C96, POS_BELOW_C},
{0x0C97, POS_BELOW_C},
{0x0C98, POS_BELOW_C},
{0x0C99, POS_BELOW_C},
{0x0C9A, POS_BELOW_C},
{0x0C9B, POS_BELOW_C},
{0x0C9C, POS_BELOW_C},
{0x0C9D, POS_BELOW_C},
{0x0C9E, POS_BELOW_C},
{0x0C9F, POS_BELOW_C},
{0x0CA0, POS_BELOW_C},
{0x0CA1, POS_BELOW_C},
{0x0CA2, POS_BELOW_C},
{0x0CA3, POS_BELOW_C},
{0x0CA4, POS_BELOW_C},
{0x0CA5, POS_BELOW_C},
{0x0CA6, POS_BELOW_C},
{0x0CA7, POS_BELOW_C},
{0x0CA8, POS_BELOW_C},
{0x0CAA, POS_BELOW_C},
{0x0CAB, POS_BELOW_C},
{0x0CAC, POS_BELOW_C},
{0x0CAD, POS_BELOW_C},
{0x0CAE, POS_BELOW_C},
{0x0CAF, POS_BELOW_C},
{0x0CB0, POS_BELOW_C},
{0x0CB2, POS_BELOW_C},
{0x0CB3, POS_BELOW_C},
{0x0CB5, POS_BELOW_C},
{0x0CB6, POS_BELOW_C},
{0x0CB7, POS_BELOW_C},
{0x0CB8, POS_BELOW_C},
{0x0CB9, POS_BELOW_C},
{0x0CDE, POS_BELOW_C},
{0x0D2F, POS_POST_C},
{0x0D30, POS_POST_C},
{0x0D32, POS_BELOW_C},
{0x0D35, POS_POST_C},
};
/* 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[] = {
0x0930, /* Devanagari */
0x09B0, /* Bengali */
0x09F0, /* Bengali */
0x0A30, /* Gurmukhi */ /* No Reph */
0x0AB0, /* Gujarati */
0x0B30, /* Oriya */
0x0BB0, /* Tamil */ /* No Reph */
0x0C30, /* Telugu */ /* No Reph */
0x0CB0, /* Kannada */
0x0D30, /* Malayalam */ /* No Reph, Logical Repha */
0x0DBB, /* Sinhala */ /* Reph formed only with ZWJ */
0x179A, /* Khmer */ /* No Reph, Visual Repha */
};
#endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */
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