harfbuzz/src/hb-ot-map.cc

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/*
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* Copyright © 2009,2010 Red Hat, Inc.
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* Copyright © 2010,2011 Google, Inc.
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*
* 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-ot-map-private.hh"
#include "hb-ot-shape-private.hh"
void
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hb_ot_map_t::add_lookups (hb_face_t *face,
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unsigned int table_index,
unsigned int feature_index,
hb_mask_t mask)
{
unsigned int lookup_indices[32];
unsigned int offset, len;
offset = 0;
do {
len = ARRAY_LENGTH (lookup_indices);
hb_ot_layout_feature_get_lookup_indexes (face,
table_tags[table_index],
feature_index,
offset, &len,
lookup_indices);
for (unsigned int i = 0; i < len; i++) {
hb_ot_map_t::lookup_map_t *lookup = lookups[table_index].push ();
if (unlikely (!lookup))
return;
lookup->mask = mask;
lookup->index = lookup_indices[i];
}
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offset += len;
} while (len == ARRAY_LENGTH (lookup_indices));
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}
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void hb_ot_map_builder_t::add_feature (hb_tag_t tag, unsigned int value, bool global)
{
feature_info_t *info = feature_infos.push();
if (unlikely (!info)) return;
info->tag = tag;
info->seq = feature_infos.len;
info->max_value = value;
info->global = global;
info->default_value = global ? value : 0;
info->stage[0] = current_stage[0];
info->stage[1] = current_stage[1];
}
void hb_ot_map_t::apply (unsigned int table_index,
hb_ot_map_t::apply_lookup_func_t apply_lookup_func,
void *face_or_font,
hb_buffer_t *buffer) const
{
unsigned int i = 0;
for (unsigned int pause_index = 0; pause_index < pauses[table_index].len; pause_index++) {
const pause_map_t *pause = &pauses[table_index][pause_index];
for (; i < pause->num_lookups; i++)
apply_lookup_func (face_or_font, buffer, lookups[table_index][i].index, lookups[table_index][i].mask);
if (table_index == 0)
buffer->clear_output ();
pause->callback.func (this, face_or_font, buffer, pause->callback.user_data);
}
for (; i < lookups[table_index].len; i++)
apply_lookup_func (face_or_font, buffer, lookups[table_index][i].index, lookups[table_index][i].mask);
}
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void hb_ot_map_t::substitute_closure (hb_face_t *face,
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hb_set_t *glyphs) const
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{
unsigned int table_index = 0;
unsigned int i = 0;
for (unsigned int pause_index = 0; pause_index < pauses[table_index].len; pause_index++) {
const pause_map_t *pause = &pauses[table_index][pause_index];
for (; i < pause->num_lookups; i++)
hb_ot_layout_substitute_closure_lookup (face, glyphs, lookups[table_index][i].index);
}
for (; i < lookups[table_index].len; i++)
hb_ot_layout_substitute_closure_lookup (face, glyphs, lookups[table_index][i].index);
}
void hb_ot_map_builder_t::add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func, void *user_data)
{
if (pause_func) {
pause_info_t *p = pauses[table_index].push ();
if (likely (p)) {
p->stage = current_stage[table_index];
p->callback.func = pause_func;
p->callback.user_data = user_data;
}
}
current_stage[table_index]++;
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}
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void
hb_ot_map_builder_t::compile (hb_face_t *face,
const hb_segment_properties_t *props,
hb_ot_map_t &m)
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{
m.global_mask = 1;
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if (!feature_infos.len)
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return;
/* Fetch script/language indices for GSUB/GPOS. We need these later to skip
* features not available in either table and not waste precious bits for them. */
hb_tag_t script_tags[3] = {HB_TAG_NONE};
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hb_tag_t language_tag;
hb_ot_tags_from_script (props->script, &script_tags[0], &script_tags[1]);
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language_tag = hb_ot_tag_from_language (props->language);
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unsigned int script_index[2], language_index[2];
for (unsigned int table_index = 0; table_index < 2; table_index++) {
hb_tag_t table_tag = table_tags[table_index];
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hb_ot_layout_table_choose_script (face, table_tag, script_tags, &script_index[table_index], &m.chosen_script[table_index]);
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hb_ot_layout_script_find_language (face, table_tag, script_index[table_index], language_tag, &language_index[table_index]);
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}
/* Sort features and merge duplicates */
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{
feature_infos.sort ();
unsigned int j = 0;
for (unsigned int i = 1; i < feature_infos.len; i++)
if (feature_infos[i].tag != feature_infos[j].tag)
feature_infos[++j] = feature_infos[i];
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else {
if (feature_infos[i].global) {
feature_infos[j].global = true;
feature_infos[j].max_value = feature_infos[i].max_value;
feature_infos[j].default_value = feature_infos[i].default_value;
} else {
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feature_infos[j].global = false;
feature_infos[j].max_value = MAX (feature_infos[j].max_value, feature_infos[i].max_value);
}
feature_infos[j].stage[0] = MIN (feature_infos[j].stage[0], feature_infos[i].stage[0]);
feature_infos[j].stage[1] = MIN (feature_infos[j].stage[1], feature_infos[i].stage[1]);
/* Inherit default_value from j */
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}
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feature_infos.shrink (j + 1);
}
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/* Allocate bits now */
unsigned int next_bit = 1;
for (unsigned int i = 0; i < feature_infos.len; i++) {
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const feature_info_t *info = &feature_infos[i];
unsigned int bits_needed;
if (info->global && info->max_value == 1)
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/* Uses the global bit */
bits_needed = 0;
else
bits_needed = _hb_bit_storage (info->max_value);
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if (!info->max_value || next_bit + bits_needed > 8 * sizeof (hb_mask_t))
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continue; /* Feature disabled, or not enough bits. */
bool found = false;
unsigned int feature_index[2];
for (unsigned int table_index = 0; table_index < 2; table_index++)
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found |= hb_ot_layout_language_find_feature (face,
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table_tags[table_index],
script_index[table_index],
language_index[table_index],
info->tag,
&feature_index[table_index]);
if (!found)
continue;
hb_ot_map_t::feature_map_t *map = m.features.push ();
if (unlikely (!map))
break;
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map->tag = info->tag;
map->index[0] = feature_index[0];
map->index[1] = feature_index[1];
map->stage[0] = info->stage[0];
map->stage[1] = info->stage[1];
if (info->global && info->max_value == 1) {
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/* Uses the global bit */
map->shift = 0;
map->mask = 1;
} else {
map->shift = next_bit;
map->mask = (1 << (next_bit + bits_needed)) - (1 << next_bit);
next_bit += bits_needed;
if (info->global)
m.global_mask |= (info->default_value << map->shift) & map->mask;
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}
map->_1_mask = (1 << map->shift) & map->mask;
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}
feature_infos.shrink (0); /* Done with these */
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add_gsub_pause (NULL, NULL);
add_gpos_pause (NULL, NULL);
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for (unsigned int table_index = 0; table_index < 2; table_index++) {
hb_tag_t table_tag = table_tags[table_index];
/* Collect lookup indices for features */
unsigned int required_feature_index;
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if (hb_ot_layout_language_get_required_feature_index (face,
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table_tag,
script_index[table_index],
language_index[table_index],
&required_feature_index))
m.add_lookups (face, table_index, required_feature_index, 1);
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unsigned int pause_index = 0;
unsigned int last_num_lookups = 0;
for (unsigned stage = 0; stage < current_stage[table_index]; stage++)
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{
for (unsigned i = 0; i < m.features.len; i++)
if (m.features[i].stage[table_index] == stage)
m.add_lookups (face, table_index, m.features[i].index[table_index], m.features[i].mask);
/* Sort lookups and merge duplicates */
if (last_num_lookups < m.lookups[table_index].len)
{
m.lookups[table_index].sort (last_num_lookups, m.lookups[table_index].len);
unsigned int j = last_num_lookups;
for (unsigned int i = j + 1; i < m.lookups[table_index].len; i++)
if (m.lookups[table_index][i].index != m.lookups[table_index][j].index)
m.lookups[table_index][++j] = m.lookups[table_index][i];
else
m.lookups[table_index][j].mask |= m.lookups[table_index][i].mask;
m.lookups[table_index].shrink (j + 1);
}
last_num_lookups = m.lookups[table_index].len;
if (pause_index < pauses[table_index].len && pauses[table_index][pause_index].stage == stage) {
hb_ot_map_t::pause_map_t *pause_map = m.pauses[table_index].push ();
if (likely (pause_map)) {
pause_map->num_lookups = last_num_lookups;
pause_map->callback = pauses[table_index][pause_index].callback;
}
pause_index++;
}
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}
}
}