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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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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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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/* Categories used in IndicSyllabicCategory.txt from UCD */
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/* The assignments are guesswork */
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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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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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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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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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enum indic_matra_category_t {
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INDIC_MATRA_CATEGORY_NOT_APPLICABLE = 0,
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2011-06-15 21:22:48 +00:00
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INDIC_MATRA_CATEGORY_LEFT = 0x01,
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INDIC_MATRA_CATEGORY_TOP = 0x02,
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INDIC_MATRA_CATEGORY_BOTTOM = 0x04,
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INDIC_MATRA_CATEGORY_RIGHT = 0x08,
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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. */
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INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_BOTTOM +
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INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_LEFT +
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INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_TOP +
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INDIC_MATRA_CATEGORY_BOTTOM,
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INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_TOP +
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INDIC_MATRA_CATEGORY_BOTTOM +
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INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP +
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INDIC_MATRA_CATEGORY_LEFT,
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_TOP +
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INDIC_MATRA_CATEGORY_LEFT +
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INDIC_MATRA_CATEGORY_RIGHT,
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INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_TOP +
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INDIC_MATRA_CATEGORY_RIGHT,
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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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2011-06-07 21:02:48 +00:00
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#define INDIC_COMBINE_CATEGORIES(S,M) \
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(ASSERT_STATIC_EXPR (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)), \
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ASSERT_STATIC_EXPR (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 23:05:34 +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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{
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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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void
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2011-06-17 22:35:46 +00:00
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_hb_ot_shape_complex_collect_features_indic (hb_ot_shape_planner_t *planner, const hb_segment_properties_t *props HB_UNUSED)
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2011-06-02 21:43:12 +00:00
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{
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for (unsigned int i = 0; i < ARRAY_LENGTH (indic_basic_features); i++)
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2011-06-24 23:05:34 +00:00
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planner->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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for (unsigned int i = 0; i < ARRAY_LENGTH (indic_other_features); i++)
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planner->map.add_bool_feature (indic_other_features[i], true);
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}
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2011-06-17 22:35:46 +00:00
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#include "hb-ot-shape-complex-indic-machine.hh"
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2011-06-02 21:43:12 +00:00
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void
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_hb_ot_shape_complex_setup_masks_indic (hb_ot_shape_context_t *c)
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{
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unsigned int count = c->buffer->len;
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for (unsigned int i = 0; i < count; i++)
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{
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2011-06-17 22:35:46 +00:00
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unsigned int type = get_indic_categories (c->buffer->info[i].codepoint);
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2011-06-02 21:43:12 +00:00
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2011-06-17 22:35:46 +00:00
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c->buffer->info[i].indic_category() = type & 0x0F;
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c->buffer->info[i].indic_position() = type >> 4;
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2011-06-02 21:43:12 +00:00
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}
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2011-06-17 22:35:46 +00:00
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find_syllables (c);
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2011-06-02 21:43:12 +00:00
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hb_mask_t mask_array[ARRAY_LENGTH (indic_basic_features)] = {0};
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unsigned int num_masks = ARRAY_LENGTH (indic_basic_features);
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for (unsigned int i = 0; i < num_masks; i++)
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mask_array[i] = c->plan->map.get_1_mask (indic_basic_features[i].tag);
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2011-06-02 21:43:12 +00:00
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}
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HB_END_DECLS
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