2011-06-02 21:43:12 +00:00
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/*
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2011-06-07 21:02:48 +00:00
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* Copyright © 2011 Google, Inc.
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2011-06-02 21:43:12 +00:00
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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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#include "hb-ot-shape-complex-private.hh"
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HB_BEGIN_DECLS
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/* buffer var allocations */
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2011-06-17 22:35:46 +00:00
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#define indic_category() var2.u8[0] /* indic_category_t */
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#define indic_position() var2.u8[1] /* indic_matra_category_t */
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2011-06-02 21:43:12 +00:00
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#define INDIC_TABLE_ELEMENT_TYPE uint8_t
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2011-06-07 21:02:48 +00:00
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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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2011-06-24 23:05:34 +00:00
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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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2011-06-17 22:35:46 +00:00
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enum indic_category_t {
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2011-06-07 21:02:48 +00:00
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OT_X = 0,
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OT_C,
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2011-06-24 23:05:34 +00:00
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OT_Ra, /* Not explicitly listed in the OT spec, but used in the grammar. */
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2011-06-07 21:02:48 +00:00
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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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2011-06-14 18:47:07 +00:00
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OT_NBSP
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2011-06-07 21:02:48 +00:00
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};
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2011-06-25 00:45:55 +00:00
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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_PRE,
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POS_BASE,
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POS_ABOVE,
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POS_BELOW,
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POS_POST,
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POS_INHERIT /* For Halant, Nukta, ZWJ, ZWNJ */
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};
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2011-06-07 21:02:48 +00:00
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/* Categories used in IndicSyllabicCategory.txt from UCD */
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/* The assignments are guesswork */
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2011-06-02 21:43:12 +00:00
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enum indic_syllabic_category_t {
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INDIC_SYLLABIC_CATEGORY_OTHER = OT_X,
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2011-06-15 21:22:48 +00:00
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INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_X,
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2011-06-07 21:02:48 +00:00
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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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2011-06-15 21:22:48 +00:00
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INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X,
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2011-06-07 21:02:48 +00:00
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INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N,
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2011-06-15 21:22:48 +00:00
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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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2011-06-07 21:02:48 +00:00
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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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2011-06-14 18:47:07 +00:00
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INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V
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2011-06-02 21:43:12 +00:00
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};
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2011-06-07 21:02:48 +00:00
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/* Categories used in IndicSMatraCategory.txt from UCD */
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2011-06-02 21:43:12 +00:00
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enum indic_matra_category_t {
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2011-06-25 00:45:55 +00:00
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INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_BASE,
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2011-06-07 21:02:48 +00:00
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2011-06-25 00:45:55 +00:00
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INDIC_MATRA_CATEGORY_LEFT = POS_PRE,
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INDIC_MATRA_CATEGORY_TOP = POS_ABOVE,
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INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW,
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INDIC_MATRA_CATEGORY_RIGHT = POS_POST,
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2011-06-15 21:22:48 +00:00
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/* We don't really care much about these since we decompose them
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2011-06-25 00:45:55 +00:00
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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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INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_BOTTOM,
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INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_LEFT,
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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_BOTTOM,
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_LEFT,
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_LEFT,
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INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT,
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2011-06-15 21:22:48 +00:00
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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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2011-06-02 21:43:12 +00:00
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};
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2011-06-28 18:13:38 +00:00
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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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2011-06-07 21:02:48 +00:00
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#define INDIC_COMBINE_CATEGORIES(S,M) \
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2011-06-28 18:13:38 +00:00
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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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2011-06-02 21:43:12 +00:00
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#include "hb-ot-shape-complex-indic-table.hh"
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2011-06-24 23:05:52 +00:00
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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 {
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hb_codepoint_t u;
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2011-06-25 00:45:55 +00:00
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indic_position_t position;
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2011-06-24 23:05:52 +00:00
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} consonant_positions[] = {
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2011-06-25 00:45:55 +00:00
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{0x0930, POS_BELOW},
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{0x09AC, POS_BELOW},
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{0x09AF, POS_POST},
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{0x09B0, POS_BELOW},
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{0x09F0, POS_BELOW},
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{0x0A2F, POS_POST},
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{0x0A30, POS_BELOW},
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{0x0A35, POS_BELOW},
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{0x0A39, POS_BELOW},
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{0x0AB0, POS_BELOW},
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{0x0B24, POS_BELOW},
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{0x0B28, POS_BELOW},
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{0x0B2C, POS_BELOW},
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{0x0B2D, POS_BELOW},
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{0x0B2E, POS_BELOW},
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{0x0B2F, POS_POST},
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{0x0B30, POS_BELOW},
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{0x0B32, POS_BELOW},
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{0x0B33, POS_BELOW},
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{0x0B5F, POS_POST},
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{0x0B71, POS_BELOW},
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{0x0C15, POS_BELOW},
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{0x0C16, POS_BELOW},
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{0x0C17, POS_BELOW},
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{0x0C18, POS_BELOW},
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{0x0C19, POS_BELOW},
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{0x0C1A, POS_BELOW},
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{0x0C1B, POS_BELOW},
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{0x0C1C, POS_BELOW},
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{0x0C1D, POS_BELOW},
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{0x0C1E, POS_BELOW},
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{0x0C1F, POS_BELOW},
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{0x0C20, POS_BELOW},
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{0x0C21, POS_BELOW},
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{0x0C22, POS_BELOW},
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{0x0C23, POS_BELOW},
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{0x0C24, POS_BELOW},
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{0x0C25, POS_BELOW},
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{0x0C26, POS_BELOW},
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{0x0C27, POS_BELOW},
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{0x0C28, POS_BELOW},
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{0x0C2A, POS_BELOW},
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{0x0C2B, POS_BELOW},
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{0x0C2C, POS_BELOW},
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{0x0C2D, POS_BELOW},
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{0x0C2E, POS_BELOW},
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{0x0C2F, POS_BELOW},
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{0x0C30, POS_BELOW},
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{0x0C32, POS_BELOW},
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{0x0C33, POS_BELOW},
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{0x0C35, POS_BELOW},
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{0x0C36, POS_BELOW},
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{0x0C37, POS_BELOW},
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{0x0C38, POS_BELOW},
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{0x0C39, POS_BELOW},
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{0x0C95, POS_BELOW},
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{0x0C96, POS_BELOW},
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{0x0C97, POS_BELOW},
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{0x0C98, POS_BELOW},
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{0x0C99, POS_BELOW},
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{0x0C9A, POS_BELOW},
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{0x0C9B, POS_BELOW},
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{0x0C9C, POS_BELOW},
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{0x0C9D, POS_BELOW},
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{0x0C9E, POS_BELOW},
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{0x0C9F, POS_BELOW},
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{0x0CA0, POS_BELOW},
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{0x0CA1, POS_BELOW},
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{0x0CA2, POS_BELOW},
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{0x0CA3, POS_BELOW},
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{0x0CA4, POS_BELOW},
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{0x0CA5, POS_BELOW},
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{0x0CA6, POS_BELOW},
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{0x0CA7, POS_BELOW},
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{0x0CA8, POS_BELOW},
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{0x0CAA, POS_BELOW},
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{0x0CAB, POS_BELOW},
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{0x0CAC, POS_BELOW},
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{0x0CAD, POS_BELOW},
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{0x0CAE, POS_BELOW},
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{0x0CAF, POS_BELOW},
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{0x0CB0, POS_BELOW},
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{0x0CB2, POS_BELOW},
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{0x0CB3, POS_BELOW},
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{0x0CB5, POS_BELOW},
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{0x0CB6, POS_BELOW},
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{0x0CB7, POS_BELOW},
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{0x0CB8, POS_BELOW},
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{0x0CB9, POS_BELOW},
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{0x0CDE, POS_BELOW},
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{0x0D2F, POS_POST},
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{0x0D30, POS_POST},
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{0x0D32, POS_BELOW},
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{0x0D35, POS_POST},
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2011-06-24 23:05:52 +00:00
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};
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2011-06-24 23:05:34 +00:00
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static const struct {
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hb_tag_t tag;
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hb_bool_t is_global;
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} indic_basic_features[] =
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2011-06-02 21:43:12 +00:00
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{
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{HB_TAG('n','u','k','t'), true},
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{HB_TAG('a','k','h','n'), false},
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{HB_TAG('r','p','h','f'), false},
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{HB_TAG('r','k','r','f'), false},
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{HB_TAG('p','r','e','f'), false},
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{HB_TAG('b','l','w','f'), false},
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{HB_TAG('h','a','l','f'), false},
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{HB_TAG('v','a','t','u'), true},
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{HB_TAG('p','s','t','f'), false},
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{HB_TAG('c','j','c','t'), true},
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};
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/* Same order as the indic_basic_features array */
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enum {
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_NUKT,
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AKHN,
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RPHF,
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RKRF,
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PREF,
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BLWF,
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HALF,
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_VATU,
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PSTF,
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_CJCT,
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2011-06-02 21:43:12 +00:00
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};
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static const hb_tag_t indic_other_features[] =
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{
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HB_TAG('p','r','e','s'),
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HB_TAG('a','b','v','s'),
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HB_TAG('b','l','w','s'),
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HB_TAG('p','s','t','s'),
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HB_TAG('h','a','l','n'),
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HB_TAG('d','i','s','t'),
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HB_TAG('a','b','v','m'),
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HB_TAG('b','l','w','m'),
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};
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2011-07-08 04:22:40 +00:00
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static void
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final_reordering (const hb_ot_map_t *map,
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hb_face_t *face,
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hb_buffer_t *buffer,
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void *user_data HB_UNUSED)
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|
|
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{
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|
}
|
2011-06-02 21:43:12 +00:00
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void
|
2011-07-08 02:25:25 +00:00
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_hb_ot_shape_complex_collect_features_indic (hb_ot_map_builder_t *map, const hb_segment_properties_t *props)
|
2011-06-02 21:43:12 +00:00
|
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|
{
|
2011-07-08 04:22:40 +00:00
|
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|
map->add_bool_feature (HB_TAG('l','o','c','l'));
|
2011-07-20 20:42:10 +00:00
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|
/* The Indic specs do not require ccmp, but we apply it here since if
|
|
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|
* there is a use of it, it's typically at the beginning. */
|
2011-07-08 04:22:40 +00:00
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map->add_bool_feature (HB_TAG('c','c','m','p'));
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|
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map->add_gsub_pause (NULL, NULL);
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2011-06-02 21:43:12 +00:00
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for (unsigned int i = 0; i < ARRAY_LENGTH (indic_basic_features); i++)
|
2011-07-08 02:25:25 +00:00
|
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|
map->add_bool_feature (indic_basic_features[i].tag, indic_basic_features[i].is_global);
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2011-06-02 21:43:12 +00:00
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|
2011-07-08 04:22:40 +00:00
|
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|
map->add_gsub_pause (final_reordering, NULL);
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|
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|
2011-06-02 21:43:12 +00:00
|
|
|
for (unsigned int i = 0; i < ARRAY_LENGTH (indic_other_features); i++)
|
2011-07-08 02:25:25 +00:00
|
|
|
map->add_bool_feature (indic_other_features[i], true);
|
2011-06-02 21:43:12 +00:00
|
|
|
}
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|
2011-06-17 22:35:46 +00:00
|
|
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|
2011-07-21 16:23:12 +00:00
|
|
|
bool
|
|
|
|
_hb_ot_shape_complex_prefer_decomposed_indic (void)
|
|
|
|
{
|
|
|
|
/* We want split matras decomposed by the common shaping logic. */
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
2011-07-04 16:56:38 +00:00
|
|
|
static void
|
2011-07-08 02:25:25 +00:00
|
|
|
found_syllable (hb_ot_map_t *map, hb_buffer_t *buffer,
|
|
|
|
unsigned int start, unsigned int end)
|
2011-07-04 16:56:38 +00:00
|
|
|
{
|
|
|
|
//fprintf (stderr, "%d %d\n", start, end);
|
|
|
|
}
|
2011-06-17 22:35:46 +00:00
|
|
|
|
|
|
|
#include "hb-ot-shape-complex-indic-machine.hh"
|
|
|
|
|
|
|
|
|
2011-06-02 21:43:12 +00:00
|
|
|
void
|
2011-07-08 02:25:25 +00:00
|
|
|
_hb_ot_shape_complex_setup_masks_indic (hb_ot_map_t *map, hb_buffer_t *buffer)
|
2011-06-02 21:43:12 +00:00
|
|
|
{
|
2011-07-08 02:25:25 +00:00
|
|
|
unsigned int count = buffer->len;
|
2011-06-02 21:43:12 +00:00
|
|
|
|
|
|
|
for (unsigned int i = 0; i < count; i++)
|
|
|
|
{
|
2011-07-08 02:25:25 +00:00
|
|
|
unsigned int type = get_indic_categories (buffer->info[i].codepoint);
|
2011-06-02 21:43:12 +00:00
|
|
|
|
2011-07-08 02:25:25 +00:00
|
|
|
buffer->info[i].indic_category() = type & 0x0F;
|
|
|
|
buffer->info[i].indic_position() = type >> 4;
|
2011-06-02 21:43:12 +00:00
|
|
|
}
|
|
|
|
|
2011-07-08 02:25:25 +00:00
|
|
|
find_syllables (map, buffer);
|
2011-06-17 22:35:46 +00:00
|
|
|
|
2011-06-02 21:43:12 +00:00
|
|
|
hb_mask_t mask_array[ARRAY_LENGTH (indic_basic_features)] = {0};
|
|
|
|
unsigned int num_masks = ARRAY_LENGTH (indic_basic_features);
|
|
|
|
for (unsigned int i = 0; i < num_masks; i++)
|
2011-07-08 02:25:25 +00:00
|
|
|
mask_array[i] = map->get_1_mask (indic_basic_features[i].tag);
|
2011-06-02 21:43:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
HB_END_DECLS
|