273 lines
8.3 KiB
C++
273 lines
8.3 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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/* buffer var allocations */
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#define indic_category() complex_var_persistent_u8_0() /* indic_category_t */
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#define indic_position() complex_var_persistent_u8_1() /* indic_matra_category_t */
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#define INDIC_TABLE_ELEMENT_TYPE uint8_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,
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OT_Ra, /* Not explicitly listed in the OT spec, but used in the grammar. */
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OT_V,
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OT_N,
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OT_H,
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OT_ZWNJ,
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OT_ZWJ,
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OT_M,
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OT_SM,
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OT_VD,
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OT_A,
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OT_NBSP,
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OT_DOTTEDCIRCLE /* Not in the spec, but special in Uniscribe. /Very very/ special! */
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};
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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_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_ABOVE_C,
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POS_BELOW_C,
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POS_ABOVE_M,
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POS_BELOW_M,
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POS_POST_C,
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POS_POST_M,
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POS_SMVD
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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_X,
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INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM,
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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_C,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_C,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_NBSP,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_C,
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INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA = OT_C,
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INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X,
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INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N,
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INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_X,
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INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X,
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INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_X,
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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_BASE_C,
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INDIC_MATRA_CATEGORY_LEFT = POS_PRE_M,
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INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_M,
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INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_M,
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INDIC_MATRA_CATEGORY_RIGHT = POS_POST_M,
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/* We don't really care much about these since we decompose them
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* in the generic pre-shaping layer. They will only be used if
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* the font does not cover the decomposition. In which case, we
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* define these as aliases to the place we want the split-matra
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* glyph to show up. Quite arbitrary.
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*
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* TODO: There are some split matras without Unicode decompositions.
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* We have to figure out what to do with them.
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*/
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INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = POS_POST_M,
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INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = POS_POST_M,
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INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = POS_BELOW_M,
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INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = POS_POST_M,
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT = POS_ABOVE_M,
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = POS_POST_M,
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INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = POS_POST_M,
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INDIC_MATRA_CATEGORY_INVISIBLE = INDIC_MATRA_CATEGORY_NOT_APPLICABLE,
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INDIC_MATRA_CATEGORY_OVERSTRUCK = INDIC_MATRA_CATEGORY_NOT_APPLICABLE,
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INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = INDIC_MATRA_CATEGORY_NOT_APPLICABLE
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};
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/* Note: We use ASSERT_STATIC_EXPR_ZERO() instead of ASSERT_STATIC_EXPR() and the comma operation
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* because gcc fails to optimize the latter and fills the table in at runtime. */
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#define INDIC_COMBINE_CATEGORIES(S,M) \
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(ASSERT_STATIC_EXPR_ZERO (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)) + \
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ASSERT_STATIC_EXPR_ZERO (S < 16 && M < 16) + \
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((M << 4) | S))
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#include "hb-ot-shape-complex-indic-table.hh"
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/* XXX
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* This is a hack for now. We should:
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* 1. Move this data into the main Indic table,
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* and/or
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* 2. Probe font lookups to determine consonant positions.
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*/
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static const struct consonant_position_t {
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hb_codepoint_t u;
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indic_position_t position;
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} consonant_positions[] = {
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{0x0930, POS_BELOW_C},
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{0x09AC, POS_BELOW_C},
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{0x09AF, POS_POST_C},
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{0x09B0, POS_BELOW_C},
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{0x09F0, POS_BELOW_C},
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{0x0A2F, POS_POST_C},
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{0x0A30, POS_BELOW_C},
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{0x0A35, POS_BELOW_C},
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{0x0A39, POS_BELOW_C},
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{0x0AB0, POS_BELOW_C},
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{0x0B24, POS_BELOW_C},
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{0x0B28, POS_BELOW_C},
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{0x0B2C, POS_BELOW_C},
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{0x0B2D, POS_BELOW_C},
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{0x0B2E, POS_BELOW_C},
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{0x0B2F, POS_POST_C},
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{0x0B30, POS_BELOW_C},
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{0x0B32, POS_BELOW_C},
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{0x0B33, POS_BELOW_C},
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{0x0B5F, POS_POST_C},
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{0x0B71, POS_BELOW_C},
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{0x0C15, POS_BELOW_C},
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{0x0C16, POS_BELOW_C},
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{0x0C17, POS_BELOW_C},
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{0x0C18, POS_BELOW_C},
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{0x0C19, POS_BELOW_C},
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{0x0C1A, POS_BELOW_C},
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{0x0C1B, POS_BELOW_C},
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{0x0C1C, POS_BELOW_C},
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{0x0C1D, POS_BELOW_C},
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{0x0C1E, POS_BELOW_C},
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{0x0C1F, POS_BELOW_C},
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{0x0C20, POS_BELOW_C},
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{0x0C21, POS_BELOW_C},
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{0x0C22, POS_BELOW_C},
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{0x0C23, POS_BELOW_C},
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{0x0C24, POS_BELOW_C},
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{0x0C25, POS_BELOW_C},
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{0x0C26, POS_BELOW_C},
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{0x0C27, POS_BELOW_C},
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{0x0C28, POS_BELOW_C},
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{0x0C2A, POS_BELOW_C},
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{0x0C2B, POS_BELOW_C},
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{0x0C2C, POS_BELOW_C},
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{0x0C2D, POS_BELOW_C},
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{0x0C2E, POS_BELOW_C},
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{0x0C2F, POS_BELOW_C},
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{0x0C30, POS_BELOW_C},
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{0x0C32, POS_BELOW_C},
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{0x0C33, POS_BELOW_C},
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{0x0C35, POS_BELOW_C},
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{0x0C36, POS_BELOW_C},
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{0x0C37, POS_BELOW_C},
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{0x0C38, POS_BELOW_C},
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{0x0C39, POS_BELOW_C},
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{0x0C95, POS_BELOW_C},
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{0x0C96, POS_BELOW_C},
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{0x0C97, POS_BELOW_C},
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{0x0C98, POS_BELOW_C},
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{0x0C99, POS_BELOW_C},
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{0x0C9A, POS_BELOW_C},
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{0x0C9B, POS_BELOW_C},
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{0x0C9C, POS_BELOW_C},
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{0x0C9D, POS_BELOW_C},
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{0x0C9E, POS_BELOW_C},
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{0x0C9F, POS_BELOW_C},
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{0x0CA0, POS_BELOW_C},
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{0x0CA1, POS_BELOW_C},
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{0x0CA2, POS_BELOW_C},
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{0x0CA3, POS_BELOW_C},
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{0x0CA4, POS_BELOW_C},
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{0x0CA5, POS_BELOW_C},
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{0x0CA6, POS_BELOW_C},
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{0x0CA7, POS_BELOW_C},
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{0x0CA8, POS_BELOW_C},
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{0x0CAA, POS_BELOW_C},
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{0x0CAB, POS_BELOW_C},
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{0x0CAC, POS_BELOW_C},
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{0x0CAD, POS_BELOW_C},
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{0x0CAE, POS_BELOW_C},
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{0x0CAF, POS_BELOW_C},
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{0x0CB0, POS_BELOW_C},
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{0x0CB2, POS_BELOW_C},
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{0x0CB3, POS_BELOW_C},
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{0x0CB5, POS_BELOW_C},
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{0x0CB6, POS_BELOW_C},
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{0x0CB7, POS_BELOW_C},
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{0x0CB8, POS_BELOW_C},
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{0x0CB9, POS_BELOW_C},
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{0x0CDE, POS_BELOW_C},
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{0x0D2F, POS_POST_C},
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{0x0D30, POS_POST_C},
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{0x0D32, POS_BELOW_C},
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{0x0D35, POS_POST_C},
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};
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/* XXX
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* This is a hack for now. We should move this data into the main Indic table.
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* Or completely remove it and just check in the tables.
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*/
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static const hb_codepoint_t ra_chars[] = {
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0x0930, /* Devanagari */
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0x09B0, /* Bengali */
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0x09F0, /* Bengali */
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0x0A30, /* Gurmukhi */ /* No Reph */
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0x0AB0, /* Gujarati */
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0x0B30, /* Oriya */
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0x0BB0, /* Tamil */ /* No Reph */
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0x0C30, /* Telugu */ /* No Reph */
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0x0CB0, /* Kannada */
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0x0D30, /* Malayalam */ /* No Reph */
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0x179A, /* Khmer */ /* No Reph */
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};
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#endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */
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