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harfbuzz/src/hb-ot-shape.cc

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/*
* Copyright © 2009,2010 Red Hat, Inc.
* Copyright © 2010,2011,2012 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.
*
* Red Hat Author(s): Behdad Esfahbod
* Google Author(s): Behdad Esfahbod
*/
#include "hb.hh"
#ifndef HB_NO_OT_SHAPE
#ifdef HB_NO_OT_LAYOUT
#error "Cannot compile 'ot' shaper with HB_NO_OT_LAYOUT."
#endif
#include "hb-shaper-impl.hh"
#include "hb-ot-shape.hh"
#include "hb-ot-shaper.hh"
#include "hb-ot-shape-fallback.hh"
#include "hb-ot-shape-normalize.hh"
#include "hb-ot-face.hh"
#include "hb-set.hh"
#include "hb-aat-layout.hh"
static inline bool
_hb_codepoint_is_regional_indicator (hb_codepoint_t u)
{ return hb_in_range<hb_codepoint_t> (u, 0x1F1E6u, 0x1F1FFu); }
#ifndef HB_NO_AAT_SHAPE
static inline bool
_hb_apply_morx (hb_face_t *face, const hb_segment_properties_t &props)
{
/* https://github.com/harfbuzz/harfbuzz/issues/2124 */
return hb_aat_layout_has_substitution (face) &&
(HB_DIRECTION_IS_HORIZONTAL (props.direction) || !hb_ot_layout_has_substitution (face));
}
#endif
/**
* SECTION:hb-ot-shape
* @title: hb-ot-shape
* @short_description: OpenType shaping support
* @include: hb-ot.h
*
* Support functions for OpenType shaping related queries.
**/
static void
hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner,
const hb_feature_t *user_features,
unsigned int num_user_features);
hb_ot_shape_planner_t::hb_ot_shape_planner_t (hb_face_t *face,
const hb_segment_properties_t &props) :
face (face),
props (props),
map (face, props),
aat_map (face, props)
#ifndef HB_NO_AAT_SHAPE
, apply_morx (_hb_apply_morx (face, props))
#endif
{
shaper = hb_ot_shaper_categorize (this);
script_zero_marks = shaper->zero_width_marks != HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE;
script_fallback_mark_positioning = shaper->fallback_position;
/* https://github.com/harfbuzz/harfbuzz/issues/1528 */
if (apply_morx && shaper != &_hb_ot_shaper_default)
shaper = &_hb_ot_shaper_dumber;
}
void
hb_ot_shape_planner_t::compile (hb_ot_shape_plan_t &plan,
const hb_ot_shape_plan_key_t &key)
{
plan.props = props;
plan.shaper = shaper;
map.compile (plan.map, key);
#ifndef HB_NO_AAT_SHAPE
if (apply_morx)
aat_map.compile (plan.aat_map);
#endif
#ifndef HB_NO_OT_SHAPE_FRACTIONS
plan.frac_mask = plan.map.get_1_mask (HB_TAG ('f','r','a','c'));
plan.numr_mask = plan.map.get_1_mask (HB_TAG ('n','u','m','r'));
plan.dnom_mask = plan.map.get_1_mask (HB_TAG ('d','n','o','m'));
plan.has_frac = plan.frac_mask || (plan.numr_mask && plan.dnom_mask);
#endif
plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m'));
plan.has_vert = !!plan.map.get_1_mask (HB_TAG ('v','e','r','t'));
hb_tag_t kern_tag = HB_DIRECTION_IS_HORIZONTAL (props.direction) ?
HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n');
#ifndef HB_NO_OT_KERN
plan.kern_mask = plan.map.get_mask (kern_tag);
plan.requested_kerning = !!plan.kern_mask;
#endif
#ifndef HB_NO_AAT_SHAPE
plan.trak_mask = plan.map.get_mask (HB_TAG ('t','r','a','k'));
plan.requested_tracking = !!plan.trak_mask;
#endif
bool has_gpos_kern = plan.map.get_feature_index (1, kern_tag) != HB_OT_LAYOUT_NO_FEATURE_INDEX;
bool disable_gpos = plan.shaper->gpos_tag &&
plan.shaper->gpos_tag != plan.map.chosen_script[1];
/*
* Decide who provides glyph classes. GDEF or Unicode.
*/
if (!hb_ot_layout_has_glyph_classes (face))
plan.fallback_glyph_classes = true;
/*
* Decide who does substitutions. GSUB, morx, or fallback.
*/
#ifndef HB_NO_AAT_SHAPE
plan.apply_morx = apply_morx;
#endif
/*
* Decide who does positioning. GPOS, kerx, kern, or fallback.
*/
#ifndef HB_NO_AAT_SHAPE
bool has_kerx = hb_aat_layout_has_positioning (face);
bool has_gsub = !apply_morx && hb_ot_layout_has_substitution (face);
#endif
bool has_gpos = !disable_gpos && hb_ot_layout_has_positioning (face);
if (false)
;
#ifndef HB_NO_AAT_SHAPE
/* Prefer GPOS over kerx if GSUB is present;
* https://github.com/harfbuzz/harfbuzz/issues/3008 */
else if (has_kerx && !(has_gsub && has_gpos))
plan.apply_kerx = true;
#endif
else if (has_gpos)
plan.apply_gpos = true;
if (!plan.apply_kerx && (!has_gpos_kern || !plan.apply_gpos))
{
#ifndef HB_NO_AAT_SHAPE
if (has_kerx)
plan.apply_kerx = true;
else
#endif
#ifndef HB_NO_OT_KERN
if (hb_ot_layout_has_kerning (face))
plan.apply_kern = true;
#endif
}
plan.apply_fallback_kern = !(plan.apply_gpos || plan.apply_kerx || plan.apply_kern);
plan.zero_marks = script_zero_marks &&
!plan.apply_kerx &&
(!plan.apply_kern
#ifndef HB_NO_OT_KERN
|| !hb_ot_layout_has_machine_kerning (face)
#endif
);
plan.has_gpos_mark = !!plan.map.get_1_mask (HB_TAG ('m','a','r','k'));
plan.adjust_mark_positioning_when_zeroing = !plan.apply_gpos &&
!plan.apply_kerx &&
(!plan.apply_kern
#ifndef HB_NO_OT_KERN
|| !hb_ot_layout_has_cross_kerning (face)
#endif
);
plan.fallback_mark_positioning = plan.adjust_mark_positioning_when_zeroing &&
script_fallback_mark_positioning;
#ifndef HB_NO_AAT_SHAPE
/* If we're using morx shaping, we cancel mark position adjustment because
Apple Color Emoji assumes this will NOT be done when forming emoji sequences;
https://github.com/harfbuzz/harfbuzz/issues/2967. */
if (plan.apply_morx)
plan.adjust_mark_positioning_when_zeroing = false;
/* Currently we always apply trak. */
plan.apply_trak = plan.requested_tracking && hb_aat_layout_has_tracking (face);
#endif
}
bool
hb_ot_shape_plan_t::init0 (hb_face_t *face,
const hb_shape_plan_key_t *key)
{
map.init ();
#ifndef HB_NO_AAT_SHAPE
aat_map.init ();
#endif
hb_ot_shape_planner_t planner (face,
key->props);
hb_ot_shape_collect_features (&planner,
key->user_features,
key->num_user_features);
planner.compile (*this, key->ot);
if (shaper->data_create)
{
data = shaper->data_create (this);
if (unlikely (!data))
{
map.fini ();
#ifndef HB_NO_AAT_SHAPE
aat_map.fini ();
#endif
return false;
}
}
return true;
}
void
hb_ot_shape_plan_t::fini ()
{
if (shaper->data_destroy)
shaper->data_destroy (const_cast<void *> (data));
map.fini ();
#ifndef HB_NO_AAT_SHAPE
aat_map.fini ();
#endif
}
void
hb_ot_shape_plan_t::substitute (hb_font_t *font,
hb_buffer_t *buffer) const
{
#ifndef HB_NO_AAT_SHAPE
if (unlikely (apply_morx))
hb_aat_layout_substitute (this, font, buffer);
else
#endif
map.substitute (this, font, buffer);
}
void
hb_ot_shape_plan_t::position (hb_font_t *font,
hb_buffer_t *buffer) const
{
if (this->apply_gpos)
map.position (this, font, buffer);
#ifndef HB_NO_AAT_SHAPE
else if (this->apply_kerx)
hb_aat_layout_position (this, font, buffer);
#endif
#ifndef HB_NO_OT_KERN
if (this->apply_kern)
hb_ot_layout_kern (this, font, buffer);
#endif
else if (this->apply_fallback_kern)
_hb_ot_shape_fallback_kern (this, font, buffer);
#ifndef HB_NO_AAT_SHAPE
if (this->apply_trak)
hb_aat_layout_track (this, font, buffer);
#endif
}
static const hb_ot_map_feature_t
common_features[] =
{
{HB_TAG('a','b','v','m'), F_GLOBAL},
{HB_TAG('b','l','w','m'), F_GLOBAL},
{HB_TAG('c','c','m','p'), F_GLOBAL},
{HB_TAG('l','o','c','l'), F_GLOBAL},
{HB_TAG('m','a','r','k'), F_GLOBAL_MANUAL_JOINERS},
{HB_TAG('m','k','m','k'), F_GLOBAL_MANUAL_JOINERS},
{HB_TAG('r','l','i','g'), F_GLOBAL},
};
static const hb_ot_map_feature_t
horizontal_features[] =
{
{HB_TAG('c','a','l','t'), F_GLOBAL},
{HB_TAG('c','l','i','g'), F_GLOBAL},
{HB_TAG('c','u','r','s'), F_GLOBAL},
{HB_TAG('d','i','s','t'), F_GLOBAL},
{HB_TAG('k','e','r','n'), F_GLOBAL_HAS_FALLBACK},
{HB_TAG('l','i','g','a'), F_GLOBAL},
{HB_TAG('r','c','l','t'), F_GLOBAL},
};
static void
hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner,
const hb_feature_t *user_features,
unsigned int num_user_features)
{
hb_ot_map_builder_t *map = &planner->map;
map->enable_feature (HB_TAG('r','v','r','n'));
map->add_gsub_pause (nullptr);
switch (planner->props.direction)
{
case HB_DIRECTION_LTR:
map->enable_feature (HB_TAG ('l','t','r','a'));
map->enable_feature (HB_TAG ('l','t','r','m'));
break;
case HB_DIRECTION_RTL:
map->enable_feature (HB_TAG ('r','t','l','a'));
map->add_feature (HB_TAG ('r','t','l','m'));
break;
case HB_DIRECTION_TTB:
case HB_DIRECTION_BTT:
case HB_DIRECTION_INVALID:
default:
break;
}
#ifndef HB_NO_OT_SHAPE_FRACTIONS
/* Automatic fractions. */
map->add_feature (HB_TAG ('f','r','a','c'));
map->add_feature (HB_TAG ('n','u','m','r'));
map->add_feature (HB_TAG ('d','n','o','m'));
#endif
/* Random! */
map->enable_feature (HB_TAG ('r','a','n','d'), F_RANDOM, HB_OT_MAP_MAX_VALUE);
#ifndef HB_NO_AAT_SHAPE
/* Tracking. We enable dummy feature here just to allow disabling
* AAT 'trak' table using features.
* https://github.com/harfbuzz/harfbuzz/issues/1303 */
map->enable_feature (HB_TAG ('t','r','a','k'), F_HAS_FALLBACK);
#endif
map->enable_feature (HB_TAG ('H','a','r','f')); /* Considered required. */
map->enable_feature (HB_TAG ('H','A','R','F')); /* Considered discretionary. */
if (planner->shaper->collect_features)
planner->shaper->collect_features (planner);
map->enable_feature (HB_TAG ('B','u','z','z')); /* Considered required. */
map->enable_feature (HB_TAG ('B','U','Z','Z')); /* Considered discretionary. */
for (unsigned int i = 0; i < ARRAY_LENGTH (common_features); i++)
map->add_feature (common_features[i]);
if (HB_DIRECTION_IS_HORIZONTAL (planner->props.direction))
for (unsigned int i = 0; i < ARRAY_LENGTH (horizontal_features); i++)
map->add_feature (horizontal_features[i]);
else
{
/* We only apply `vert` feature. See:
* https://github.com/harfbuzz/harfbuzz/commit/d71c0df2d17f4590d5611239577a6cb532c26528
* https://lists.freedesktop.org/archives/harfbuzz/2013-August/003490.html */
/* We really want to find a 'vert' feature if there's any in the font, no
* matter which script/langsys it is listed (or not) under.
* See various bugs referenced from:
* https://github.com/harfbuzz/harfbuzz/issues/63 */
map->enable_feature (HB_TAG ('v','e','r','t'), F_GLOBAL_SEARCH);
}
for (unsigned int i = 0; i < num_user_features; i++)
{
const hb_feature_t *feature = &user_features[i];
map->add_feature (feature->tag,
(feature->start == HB_FEATURE_GLOBAL_START &&
feature->end == HB_FEATURE_GLOBAL_END) ? F_GLOBAL : F_NONE,
feature->value);
}
#ifndef HB_NO_AAT_SHAPE
if (planner->apply_morx)
{
hb_aat_map_builder_t *aat_map = &planner->aat_map;
for (unsigned int i = 0; i < num_user_features; i++)
{
const hb_feature_t *feature = &user_features[i];
aat_map->add_feature (feature->tag, feature->value);
}
}
#endif
if (planner->shaper->override_features)
planner->shaper->override_features (planner);
}
/*
* shaper face data
*/
struct hb_ot_face_data_t {};
hb_ot_face_data_t *
_hb_ot_shaper_face_data_create (hb_face_t *face)
{
return (hb_ot_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_ot_shaper_face_data_destroy (hb_ot_face_data_t *data)
{
}
/*
* shaper font data
*/
struct hb_ot_font_data_t {};
hb_ot_font_data_t *
_hb_ot_shaper_font_data_create (hb_font_t *font HB_UNUSED)
{
return (hb_ot_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_ot_shaper_font_data_destroy (hb_ot_font_data_t *data HB_UNUSED)
{
}
/*
* shaper
*/
struct hb_ot_shape_context_t
{
hb_ot_shape_plan_t *plan;
hb_font_t *font;
hb_face_t *face;
hb_buffer_t *buffer;
const hb_feature_t *user_features;
unsigned int num_user_features;
/* Transient stuff */
hb_direction_t target_direction;
};
/* Main shaper */
/* Prepare */
static void
hb_set_unicode_props (hb_buffer_t *buffer)
{
/* Implement enough of Unicode Graphemes here that shaping
* in reverse-direction wouldn't break graphemes. Namely,
* we mark all marks and ZWJ and ZWJ,Extended_Pictographic
* sequences as continuations. The foreach_grapheme()
* macro uses this bit.
*
* https://www.unicode.org/reports/tr29/#Regex_Definitions
*/
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < count; i++)
{
_hb_glyph_info_set_unicode_props (&info[i], buffer);
/* Marks are already set as continuation by the above line.
* Handle Emoji_Modifier and ZWJ-continuation. */
if (unlikely (_hb_glyph_info_get_general_category (&info[i]) == HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL &&
hb_in_range<hb_codepoint_t> (info[i].codepoint, 0x1F3FBu, 0x1F3FFu)))
{
_hb_glyph_info_set_continuation (&info[i]);
}
/* Regional_Indicators are hairy as hell...
* https://github.com/harfbuzz/harfbuzz/issues/2265 */
else if (unlikely (i && _hb_codepoint_is_regional_indicator (info[i].codepoint)))
{
if (_hb_codepoint_is_regional_indicator (info[i - 1].codepoint) &&
!_hb_glyph_info_is_continuation (&info[i - 1]))
_hb_glyph_info_set_continuation (&info[i]);
}
#ifndef HB_NO_EMOJI_SEQUENCES
else if (unlikely (_hb_glyph_info_is_zwj (&info[i])))
{
_hb_glyph_info_set_continuation (&info[i]);
if (i + 1 < count &&
_hb_unicode_is_emoji_Extended_Pictographic (info[i + 1].codepoint))
{
i++;
_hb_glyph_info_set_unicode_props (&info[i], buffer);
_hb_glyph_info_set_continuation (&info[i]);
}
}
#endif
/* Or part of the Other_Grapheme_Extend that is not marks.
* As of Unicode 15 that is just:
*
* 200C ; Other_Grapheme_Extend # Cf ZERO WIDTH NON-JOINER
* FF9E..FF9F ; Other_Grapheme_Extend # Lm [2] HALFWIDTH KATAKANA VOICED SOUND MARK..HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK
* E0020..E007F ; Other_Grapheme_Extend # Cf [96] TAG SPACE..CANCEL TAG
*
* ZWNJ is special, we don't want to merge it as there's no need, and keeping
* it separate results in more granular clusters.
* Tags are used for Emoji sub-region flag sequences:
* https://github.com/harfbuzz/harfbuzz/issues/1556
* Katakana ones were requested:
* https://github.com/harfbuzz/harfbuzz/issues/3844
*/
else if (unlikely (hb_in_ranges<hb_codepoint_t> (info[i].codepoint, 0xFF9Eu, 0xFF9Fu, 0xE0020u, 0xE007Fu)))
_hb_glyph_info_set_continuation (&info[i]);
}
}
static void
hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
{
if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE))
return;
if (!(buffer->flags & HB_BUFFER_FLAG_BOT) ||
buffer->context_len[0] ||
!_hb_glyph_info_is_unicode_mark (&buffer->info[0]))
return;
if (!font->has_glyph (0x25CCu))
return;
hb_glyph_info_t dottedcircle = {0};
dottedcircle.codepoint = 0x25CCu;
_hb_glyph_info_set_unicode_props (&dottedcircle, buffer);
buffer->clear_output ();
buffer->idx = 0;
hb_glyph_info_t info = dottedcircle;
info.cluster = buffer->cur().cluster;
info.mask = buffer->cur().mask;
(void) buffer->output_info (info);
buffer->sync ();
}
static void
hb_form_clusters (hb_buffer_t *buffer)
{
if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII))
return;
if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES)
foreach_grapheme (buffer, start, end)
buffer->merge_clusters (start, end);
else
foreach_grapheme (buffer, start, end)
buffer->unsafe_to_break (start, end);
}
static void
hb_ensure_native_direction (hb_buffer_t *buffer)
{
hb_direction_t direction = buffer->props.direction;
hb_direction_t horiz_dir = hb_script_get_horizontal_direction (buffer->props.script);
/* Numeric runs in natively-RTL scripts are actually native-LTR, so we reset
* the horiz_dir if the run contains at least one decimal-number char, and no
* letter chars (ideally we should be checking for chars with strong
* directionality but hb-unicode currently lacks bidi categories).
*
* This allows digit sequences in Arabic etc to be shaped in "native"
* direction, so that features like ligatures will work as intended.
*
* https://github.com/harfbuzz/harfbuzz/issues/501
*
* Similar thing about Regional_Indicators; They are bidi=L, but Script=Common.
* If they are present in a run of natively-RTL text, they get assigned a script
* with natively RTL direction, which would result in wrong shaping if we
* assign such native RTL direction to them then. Detect that as well.
*
* https://github.com/harfbuzz/harfbuzz/issues/3314
*/
if (unlikely (horiz_dir == HB_DIRECTION_RTL && direction == HB_DIRECTION_LTR))
{
bool found_number = false, found_letter = false, found_ri = false;
const auto* info = buffer->info;
const auto count = buffer->len;
for (unsigned i = 0; i < count; i++)
{
auto gc = _hb_glyph_info_get_general_category (&info[i]);
if (gc == HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
found_number = true;
else if (HB_UNICODE_GENERAL_CATEGORY_IS_LETTER (gc))
{
found_letter = true;
break;
}
else if (_hb_codepoint_is_regional_indicator (info[i].codepoint))
found_ri = true;
}
if ((found_number || found_ri) && !found_letter)
horiz_dir = HB_DIRECTION_LTR;
}
/* TODO vertical:
* The only BTT vertical script is Ogham, but it's not clear to me whether OpenType
* Ogham fonts are supposed to be implemented BTT or not. Need to research that
* first. */
if ((HB_DIRECTION_IS_HORIZONTAL (direction) &&
direction != horiz_dir && horiz_dir != HB_DIRECTION_INVALID) ||
(HB_DIRECTION_IS_VERTICAL (direction) &&
direction != HB_DIRECTION_TTB))
{
_hb_ot_layout_reverse_graphemes (buffer);
buffer->props.direction = HB_DIRECTION_REVERSE (buffer->props.direction);
}
}
/*
* Substitute
*/
#ifndef HB_NO_VERTICAL
static hb_codepoint_t
hb_vert_char_for (hb_codepoint_t u)
{
switch (u >> 8)
{
case 0x20: switch (u) {
case 0x2013u: return 0xfe32u; // EN DASH
case 0x2014u: return 0xfe31u; // EM DASH
case 0x2025u: return 0xfe30u; // TWO DOT LEADER
case 0x2026u: return 0xfe19u; // HORIZONTAL ELLIPSIS
} break;
case 0x30: switch (u) {
case 0x3001u: return 0xfe11u; // IDEOGRAPHIC COMMA
case 0x3002u: return 0xfe12u; // IDEOGRAPHIC FULL STOP
case 0x3008u: return 0xfe3fu; // LEFT ANGLE BRACKET
case 0x3009u: return 0xfe40u; // RIGHT ANGLE BRACKET
case 0x300au: return 0xfe3du; // LEFT DOUBLE ANGLE BRACKET
case 0x300bu: return 0xfe3eu; // RIGHT DOUBLE ANGLE BRACKET
case 0x300cu: return 0xfe41u; // LEFT CORNER BRACKET
case 0x300du: return 0xfe42u; // RIGHT CORNER BRACKET
case 0x300eu: return 0xfe43u; // LEFT WHITE CORNER BRACKET
case 0x300fu: return 0xfe44u; // RIGHT WHITE CORNER BRACKET
case 0x3010u: return 0xfe3bu; // LEFT BLACK LENTICULAR BRACKET
case 0x3011u: return 0xfe3cu; // RIGHT BLACK LENTICULAR BRACKET
case 0x3014u: return 0xfe39u; // LEFT TORTOISE SHELL BRACKET
case 0x3015u: return 0xfe3au; // RIGHT TORTOISE SHELL BRACKET
case 0x3016u: return 0xfe17u; // LEFT WHITE LENTICULAR BRACKET
case 0x3017u: return 0xfe18u; // RIGHT WHITE LENTICULAR BRACKET
} break;
case 0xfe: switch (u) {
case 0xfe4fu: return 0xfe34u; // WAVY LOW LINE
} break;
case 0xff: switch (u) {
case 0xff01u: return 0xfe15u; // FULLWIDTH EXCLAMATION MARK
case 0xff08u: return 0xfe35u; // FULLWIDTH LEFT PARENTHESIS
case 0xff09u: return 0xfe36u; // FULLWIDTH RIGHT PARENTHESIS
case 0xff0cu: return 0xfe10u; // FULLWIDTH COMMA
case 0xff1au: return 0xfe13u; // FULLWIDTH COLON
case 0xff1bu: return 0xfe14u; // FULLWIDTH SEMICOLON
case 0xff1fu: return 0xfe16u; // FULLWIDTH QUESTION MARK
case 0xff3bu: return 0xfe47u; // FULLWIDTH LEFT SQUARE BRACKET
case 0xff3du: return 0xfe48u; // FULLWIDTH RIGHT SQUARE BRACKET
case 0xff3fu: return 0xfe33u; // FULLWIDTH LOW LINE
case 0xff5bu: return 0xfe37u; // FULLWIDTH LEFT CURLY BRACKET
case 0xff5du: return 0xfe38u; // FULLWIDTH RIGHT CURLY BRACKET
} break;
}
return u;
}
#endif
static inline void
hb_ot_rotate_chars (const hb_ot_shape_context_t *c)
{
hb_buffer_t *buffer = c->buffer;
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
if (HB_DIRECTION_IS_BACKWARD (c->target_direction))
{
hb_unicode_funcs_t *unicode = buffer->unicode;
hb_mask_t rtlm_mask = c->plan->rtlm_mask;
for (unsigned int i = 0; i < count; i++) {
hb_codepoint_t codepoint = unicode->mirroring (info[i].codepoint);
if (unlikely (codepoint != info[i].codepoint && c->font->has_glyph (codepoint)))
info[i].codepoint = codepoint;
else
info[i].mask |= rtlm_mask;
}
}
#ifndef HB_NO_VERTICAL
if (HB_DIRECTION_IS_VERTICAL (c->target_direction) && !c->plan->has_vert)
{
for (unsigned int i = 0; i < count; i++) {
hb_codepoint_t codepoint = hb_vert_char_for (info[i].codepoint);
if (unlikely (codepoint != info[i].codepoint && c->font->has_glyph (codepoint)))
info[i].codepoint = codepoint;
}
}
#endif
}
static inline void
hb_ot_shape_setup_masks_fraction (const hb_ot_shape_context_t *c)
{
#ifdef HB_NO_OT_SHAPE_FRACTIONS
return;
#endif
if (!(c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII) ||
!c->plan->has_frac)
return;
hb_buffer_t *buffer = c->buffer;
hb_mask_t pre_mask, post_mask;
if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))
{
pre_mask = c->plan->numr_mask | c->plan->frac_mask;
post_mask = c->plan->frac_mask | c->plan->dnom_mask;
}
else
{
pre_mask = c->plan->frac_mask | c->plan->dnom_mask;
post_mask = c->plan->numr_mask | c->plan->frac_mask;
}
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < count; i++)
{
if (info[i].codepoint == 0x2044u) /* FRACTION SLASH */
{
unsigned int start = i, end = i + 1;
while (start &&
_hb_glyph_info_get_general_category (&info[start - 1]) ==
HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
start--;
while (end < count &&
_hb_glyph_info_get_general_category (&info[end]) ==
HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
end++;
buffer->unsafe_to_break (start, end);
for (unsigned int j = start; j < i; j++)
info[j].mask |= pre_mask;
info[i].mask |= c->plan->frac_mask;
for (unsigned int j = i + 1; j < end; j++)
info[j].mask |= post_mask;
i = end - 1;
}
}
}
static inline void
hb_ot_shape_initialize_masks (const hb_ot_shape_context_t *c)
{
hb_ot_map_t *map = &c->plan->map;
hb_buffer_t *buffer = c->buffer;
hb_mask_t global_mask = map->get_global_mask ();
buffer->reset_masks (global_mask);
}
static inline void
hb_ot_shape_setup_masks (const hb_ot_shape_context_t *c)
{
hb_ot_map_t *map = &c->plan->map;
hb_buffer_t *buffer = c->buffer;
hb_ot_shape_setup_masks_fraction (c);
if (c->plan->shaper->setup_masks)
c->plan->shaper->setup_masks (c->plan, buffer, c->font);
for (unsigned int i = 0; i < c->num_user_features; i++)
{
const hb_feature_t *feature = &c->user_features[i];
if (!(feature->start == HB_FEATURE_GLOBAL_START && feature->end == HB_FEATURE_GLOBAL_END)) {
unsigned int shift;
hb_mask_t mask = map->get_mask (feature->tag, &shift);
buffer->set_masks (feature->value << shift, mask, feature->start, feature->end);
}
}
}
static void
hb_ot_zero_width_default_ignorables (const hb_buffer_t *buffer)
{
if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) ||
(buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES) ||
(buffer->flags & HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES))
return;
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
hb_glyph_position_t *pos = buffer->pos;
unsigned int i = 0;
for (i = 0; i < count; i++)
if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i])))
pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0;
}
static void
hb_ot_hide_default_ignorables (hb_buffer_t *buffer,
hb_font_t *font)
{
if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) ||
(buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES))
return;
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
hb_codepoint_t invisible = buffer->invisible;
if (!(buffer->flags & HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES) &&
(invisible || font->get_nominal_glyph (' ', &invisible)))
{
/* Replace default-ignorables with a zero-advance invisible glyph. */
for (unsigned int i = 0; i < count; i++)
{
if (_hb_glyph_info_is_default_ignorable (&info[i]))
info[i].codepoint = invisible;
}
}
else
hb_ot_layout_delete_glyphs_inplace (buffer, _hb_glyph_info_is_default_ignorable);
}
static inline void
hb_ot_map_glyphs_fast (hb_buffer_t *buffer)
{
/* Normalization process sets up glyph_index(), we just copy it. */
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < count; i++)
info[i].codepoint = info[i].glyph_index();
buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS;
}
static inline void
hb_synthesize_glyph_classes (hb_buffer_t *buffer)
{
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < count; i++)
{
hb_ot_layout_glyph_props_flags_t klass;
/* Never mark default-ignorables as marks.
* They won't get in the way of lookups anyway,
* but having them as mark will cause them to be skipped
* over if the lookup-flag says so, but at least for the
* Mongolian variation selectors, looks like Uniscribe
* marks them as non-mark. Some Mongolian fonts without
* GDEF rely on this. Another notable character that
* this applies to is COMBINING GRAPHEME JOINER. */
klass = (_hb_glyph_info_get_general_category (&info[i]) !=
HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK ||
_hb_glyph_info_is_default_ignorable (&info[i])) ?
HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH :
HB_OT_LAYOUT_GLYPH_PROPS_MARK;
_hb_glyph_info_set_glyph_props (&info[i], klass);
}
}
static inline void
hb_ot_substitute_default (const hb_ot_shape_context_t *c)
{
hb_buffer_t *buffer = c->buffer;
hb_ot_rotate_chars (c);
HB_BUFFER_ALLOCATE_VAR (buffer, glyph_index);
_hb_ot_shape_normalize (c->plan, buffer, c->font);
hb_ot_shape_setup_masks (c);
/* This is unfortunate to go here, but necessary... */
if (c->plan->fallback_mark_positioning)
_hb_ot_shape_fallback_mark_position_recategorize_marks (c->plan, c->font, buffer);
hb_ot_map_glyphs_fast (buffer);
HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_index);
}
static inline void
hb_ot_substitute_plan (const hb_ot_shape_context_t *c)
{
hb_buffer_t *buffer = c->buffer;
hb_ot_layout_substitute_start (c->font, buffer);
if (c->plan->fallback_glyph_classes)
hb_synthesize_glyph_classes (c->buffer);
c->plan->substitute (c->font, buffer);
}
static inline void
hb_ot_substitute_pre (const hb_ot_shape_context_t *c)
{
hb_ot_substitute_default (c);
_hb_buffer_allocate_gsubgpos_vars (c->buffer);
hb_ot_substitute_plan (c);
#ifndef HB_NO_AAT_SHAPE
if (c->plan->apply_morx && c->plan->apply_gpos)
hb_aat_layout_remove_deleted_glyphs (c->buffer);
#endif
}
static inline void
hb_ot_substitute_post (const hb_ot_shape_context_t *c)
{
#ifndef HB_NO_AAT_SHAPE
if (c->plan->apply_morx && !c->plan->apply_gpos)
hb_aat_layout_remove_deleted_glyphs (c->buffer);
#endif
hb_ot_hide_default_ignorables (c->buffer, c->font);
if (c->plan->shaper->postprocess_glyphs &&
c->buffer->message(c->font, "start postprocess-glyphs")) {
c->plan->shaper->postprocess_glyphs (c->plan, c->buffer, c->font);
(void) c->buffer->message(c->font, "end postprocess-glyphs");
}
}
/*
* Position
*/
static inline void
adjust_mark_offsets (hb_glyph_position_t *pos)
{
pos->x_offset -= pos->x_advance;
pos->y_offset -= pos->y_advance;
}
static inline void
zero_mark_width (hb_glyph_position_t *pos)
{
pos->x_advance = 0;
pos->y_advance = 0;
}
static inline void
zero_mark_widths_by_gdef (hb_buffer_t *buffer, bool adjust_offsets)
{
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < count; i++)
if (_hb_glyph_info_is_mark (&info[i]))
{
if (adjust_offsets)
adjust_mark_offsets (&buffer->pos[i]);
zero_mark_width (&buffer->pos[i]);
}
}
static inline void
hb_ot_position_default (const hb_ot_shape_context_t *c)
{
hb_direction_t direction = c->buffer->props.direction;
unsigned int count = c->buffer->len;
hb_glyph_info_t *info = c->buffer->info;
hb_glyph_position_t *pos = c->buffer->pos;
if (HB_DIRECTION_IS_HORIZONTAL (direction))
{
c->font->get_glyph_h_advances (count, &info[0].codepoint, sizeof(info[0]),
&pos[0].x_advance, sizeof(pos[0]));
/* The nil glyph_h_origin() func returns 0, so no need to apply it. */
if (c->font->has_glyph_h_origin_func ())
for (unsigned int i = 0; i < count; i++)
c->font->subtract_glyph_h_origin (info[i].codepoint,
&pos[i].x_offset,
&pos[i].y_offset);
}
else
{
c->font->get_glyph_v_advances (count, &info[0].codepoint, sizeof(info[0]),
&pos[0].y_advance, sizeof(pos[0]));
for (unsigned int i = 0; i < count; i++)
{
c->font->subtract_glyph_v_origin (info[i].codepoint,
&pos[i].x_offset,
&pos[i].y_offset);
}
}
if (c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK)
_hb_ot_shape_fallback_spaces (c->plan, c->font, c->buffer);
}
static inline void
hb_ot_position_plan (const hb_ot_shape_context_t *c)
{
unsigned int count = c->buffer->len;
hb_glyph_info_t *info = c->buffer->info;
hb_glyph_position_t *pos = c->buffer->pos;
/* If the font has no GPOS and direction is forward, then when
* zeroing mark widths, we shift the mark with it, such that the
* mark is positioned hanging over the previous glyph. When
* direction is backward we don't shift and it will end up
* hanging over the next glyph after the final reordering.
*
* Note: If fallback positinoing happens, we don't care about
* this as it will be overridden.
*/
bool adjust_offsets_when_zeroing = c->plan->adjust_mark_positioning_when_zeroing &&
HB_DIRECTION_IS_FORWARD (c->buffer->props.direction);
/* We change glyph origin to what GPOS expects (horizontal), apply GPOS, change it back. */
/* The nil glyph_h_origin() func returns 0, so no need to apply it. */
if (c->font->has_glyph_h_origin_func ())
for (unsigned int i = 0; i < count; i++)
c->font->add_glyph_h_origin (info[i].codepoint,
&pos[i].x_offset,
&pos[i].y_offset);
hb_ot_layout_position_start (c->font, c->buffer);
if (c->plan->zero_marks)
switch (c->plan->shaper->zero_width_marks)
{
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing);
break;
default:
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
break;
}
c->plan->position (c->font, c->buffer);
if (c->plan->zero_marks)
switch (c->plan->shaper->zero_width_marks)
{
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing);
break;
default:
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
break;
}
/* Finish off. Has to follow a certain order. */
hb_ot_layout_position_finish_advances (c->font, c->buffer);
hb_ot_zero_width_default_ignorables (c->buffer);
#ifndef HB_NO_AAT_SHAPE
if (c->plan->apply_morx)
hb_aat_layout_zero_width_deleted_glyphs (c->buffer);
#endif
hb_ot_layout_position_finish_offsets (c->font, c->buffer);
/* The nil glyph_h_origin() func returns 0, so no need to apply it. */
if (c->font->has_glyph_h_origin_func ())
for (unsigned int i = 0; i < count; i++)
c->font->subtract_glyph_h_origin (info[i].codepoint,
&pos[i].x_offset,
&pos[i].y_offset);
if (c->plan->fallback_mark_positioning)
_hb_ot_shape_fallback_mark_position (c->plan, c->font, c->buffer,
adjust_offsets_when_zeroing);
}
static inline void
hb_ot_position (const hb_ot_shape_context_t *c)
{
c->buffer->clear_positions ();
hb_ot_position_default (c);
hb_ot_position_plan (c);
if (HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction))
hb_buffer_reverse (c->buffer);
_hb_buffer_deallocate_gsubgpos_vars (c->buffer);
}
static inline void
hb_propagate_flags (hb_buffer_t *buffer)
{
/* Propagate cluster-level glyph flags to be the same on all cluster glyphs.
* Simplifies using them. */
if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GLYPH_FLAGS))
return;
/* If we are producing SAFE_TO_INSERT_TATWEEL, then do two things:
*
* - If the places that the Arabic shaper marked as SAFE_TO_INSERT_TATWEEL,
* are UNSAFE_TO_BREAK, then clear the SAFE_TO_INSERT_TATWEEL,
* - Any place that is SAFE_TO_INSERT_TATWEEL, is also now UNSAFE_TO_BREAK.
*
* We couldn't make this interaction earlier. It has to be done here.
*/
bool flip_tatweel = buffer->flags & HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL;
bool clear_concat = (buffer->flags & HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT) == 0;
hb_glyph_info_t *info = buffer->info;
foreach_cluster (buffer, start, end)
{
unsigned int mask = 0;
for (unsigned int i = start; i < end; i++)
mask |= info[i].mask & HB_GLYPH_FLAG_DEFINED;
if (flip_tatweel)
{
if (mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK)
mask &= ~HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL;
if (mask & HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL)
mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK | HB_GLYPH_FLAG_UNSAFE_TO_CONCAT;
}
if (clear_concat)
mask &= ~HB_GLYPH_FLAG_UNSAFE_TO_CONCAT;
for (unsigned int i = start; i < end; i++)
info[i].mask = mask;
}
}
/* Pull it all together! */
static void
hb_ot_shape_internal (hb_ot_shape_context_t *c)
{
/* Save the original direction, we use it later. */
c->target_direction = c->buffer->props.direction;
_hb_buffer_allocate_unicode_vars (c->buffer);
hb_ot_shape_initialize_masks (c);
hb_set_unicode_props (c->buffer);
hb_insert_dotted_circle (c->buffer, c->font);
hb_form_clusters (c->buffer);
hb_ensure_native_direction (c->buffer);
if (c->plan->shaper->preprocess_text &&
c->buffer->message(c->font, "start preprocess-text"))
{
c->plan->shaper->preprocess_text (c->plan, c->buffer, c->font);
(void) c->buffer->message(c->font, "end preprocess-text");
}
hb_ot_substitute_pre (c);
hb_ot_position (c);
hb_ot_substitute_post (c);
hb_propagate_flags (c->buffer);
_hb_buffer_deallocate_unicode_vars (c->buffer);
c->buffer->props.direction = c->target_direction;
c->buffer->leave ();
}
hb_bool_t
_hb_ot_shape (hb_shape_plan_t *shape_plan,
hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features)
{
hb_ot_shape_context_t c = {&shape_plan->ot, font, font->face, buffer, features, num_features};
hb_ot_shape_internal (&c);
return true;
}
/**
* hb_ot_shape_plan_collect_lookups:
* @shape_plan: #hb_shape_plan_t to query
* @table_tag: GSUB or GPOS
* @lookup_indexes: (out): The #hb_set_t set of lookups returned
*
* Computes the complete set of GSUB or GPOS lookups that are applicable
* under a given @shape_plan.
*
* Since: 0.9.7
**/
void
hb_ot_shape_plan_collect_lookups (hb_shape_plan_t *shape_plan,
hb_tag_t table_tag,
hb_set_t *lookup_indexes /* OUT */)
{
shape_plan->ot.collect_lookups (table_tag, lookup_indexes);
}
/* TODO Move this to hb-ot-shape-normalize, make it do decompose, and make it public. */
static void
add_char (hb_font_t *font,
hb_unicode_funcs_t *unicode,
hb_bool_t mirror,
hb_codepoint_t u,
hb_set_t *glyphs)
{
hb_codepoint_t glyph;
if (font->get_nominal_glyph (u, &glyph))
glyphs->add (glyph);
if (mirror)
{
hb_codepoint_t m = unicode->mirroring (u);
if (m != u && font->get_nominal_glyph (m, &glyph))
glyphs->add (glyph);
}
}
/**
* hb_ot_shape_glyphs_closure:
* @font: #hb_font_t to work upon
* @buffer: The input buffer to compute from
* @features: (array length=num_features): The features enabled on the buffer
* @num_features: The number of features enabled on the buffer
* @glyphs: (out): The #hb_set_t set of glyphs comprising the transitive closure of the query
*
* Computes the transitive closure of glyphs needed for a specified
* input buffer under the given font and feature list. The closure is
* computed as a set, not as a list.
*
* Since: 0.9.2
**/
void
hb_ot_shape_glyphs_closure (hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features,
hb_set_t *glyphs)
{
const char *shapers[] = {"ot", nullptr};
hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props,
features, num_features, shapers);
bool mirror = hb_script_get_horizontal_direction (buffer->props.script) == HB_DIRECTION_RTL;
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < count; i++)
add_char (font, buffer->unicode, mirror, info[i].codepoint, glyphs);
hb_set_t *lookups = hb_set_create ();
hb_ot_shape_plan_collect_lookups (shape_plan, HB_OT_TAG_GSUB, lookups);
hb_ot_layout_lookups_substitute_closure (font->face, lookups, glyphs);
hb_set_destroy (lookups);
hb_shape_plan_destroy (shape_plan);
}
#endif
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