harfbuzz/src/hb-ot-shape-complex-indic.cc

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/*
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* Copyright © 2011 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
*/
#include "hb-ot-shape-complex-private.hh"
HB_BEGIN_DECLS
/* buffer var allocations */
#define indic_category() var2.u8[0] /* indic_category_t */
#define indic_position() var2.u8[1] /* indic_matra_category_t */
#define INDIC_TABLE_ELEMENT_TYPE uint8_t
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/* 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 {
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OT_X = 0,
OT_C,
OT_Ra, /* Not explicitly listed in the OT spec, but used in the grammar. */
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OT_V,
OT_N,
OT_H,
OT_ZWNJ,
OT_ZWJ,
OT_M,
OT_SM,
OT_VD,
OT_A,
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OT_NBSP
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};
/* Categories used in IndicSyllabicCategory.txt from UCD */
/* The assignments are guesswork */
enum indic_syllabic_category_t {
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INDIC_SYLLABIC_CATEGORY_OTHER = OT_X,
INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_X,
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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_C,
INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X,
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INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N,
INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_X,
INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X,
INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_X,
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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,
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INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V
};
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/* Categories used in IndicSMatraCategory.txt from UCD */
enum indic_matra_category_t {
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INDIC_MATRA_CATEGORY_NOT_APPLICABLE = 0,
INDIC_MATRA_CATEGORY_LEFT = 0x01,
INDIC_MATRA_CATEGORY_TOP = 0x02,
INDIC_MATRA_CATEGORY_BOTTOM = 0x04,
INDIC_MATRA_CATEGORY_RIGHT = 0x08,
/* We don't really care much about these since we decompose them
* in the generic pre-shaping layer. */
INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_BOTTOM +
INDIC_MATRA_CATEGORY_RIGHT,
INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_LEFT +
INDIC_MATRA_CATEGORY_RIGHT,
INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_TOP +
INDIC_MATRA_CATEGORY_BOTTOM,
INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_TOP +
INDIC_MATRA_CATEGORY_BOTTOM +
INDIC_MATRA_CATEGORY_RIGHT,
INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP +
INDIC_MATRA_CATEGORY_LEFT,
INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_TOP +
INDIC_MATRA_CATEGORY_LEFT +
INDIC_MATRA_CATEGORY_RIGHT,
INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_TOP +
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
};
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#define INDIC_COMBINE_CATEGORIES(S,M) \
(ASSERT_STATIC_EXPR (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)), \
ASSERT_STATIC_EXPR (S < 16 && M < 16), \
(M << 4) | S)
#include "hb-ot-shape-complex-indic-table.hh"
static const struct {
hb_tag_t tag;
hb_bool_t is_global;
} indic_basic_features[] =
{
{HB_TAG('n','u','k','t'), true},
{HB_TAG('a','k','h','n'), false},
{HB_TAG('r','p','h','f'), false},
{HB_TAG('r','k','r','f'), false},
{HB_TAG('p','r','e','f'), false},
{HB_TAG('b','l','w','f'), false},
{HB_TAG('h','a','l','f'), false},
{HB_TAG('v','a','t','u'), true},
{HB_TAG('p','s','t','f'), false},
{HB_TAG('c','j','c','t'), true},
};
/* Same order as the indic_basic_features array */
enum {
_NUKT,
AKHN,
RPHF,
RKRF,
PREF,
BLWF,
HALF,
_VATU,
PSTF,
_CJCT,
};
static const hb_tag_t indic_other_features[] =
{
HB_TAG('p','r','e','s'),
HB_TAG('a','b','v','s'),
HB_TAG('b','l','w','s'),
HB_TAG('p','s','t','s'),
HB_TAG('h','a','l','n'),
HB_TAG('d','i','s','t'),
HB_TAG('a','b','v','m'),
HB_TAG('b','l','w','m'),
};
void
_hb_ot_shape_complex_collect_features_indic (hb_ot_shape_planner_t *planner, const hb_segment_properties_t *props HB_UNUSED)
{
for (unsigned int i = 0; i < ARRAY_LENGTH (indic_basic_features); i++)
planner->map.add_bool_feature (indic_basic_features[i].tag, indic_basic_features[i].is_global);
for (unsigned int i = 0; i < ARRAY_LENGTH (indic_other_features); i++)
planner->map.add_bool_feature (indic_other_features[i], true);
}
#include "hb-ot-shape-complex-indic-machine.hh"
void
_hb_ot_shape_complex_setup_masks_indic (hb_ot_shape_context_t *c)
{
unsigned int count = c->buffer->len;
for (unsigned int i = 0; i < count; i++)
{
unsigned int type = get_indic_categories (c->buffer->info[i].codepoint);
c->buffer->info[i].indic_category() = type & 0x0F;
c->buffer->info[i].indic_position() = type >> 4;
}
find_syllables (c);
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++)
mask_array[i] = c->plan->map.get_1_mask (indic_basic_features[i].tag);
}
HB_END_DECLS