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harfbuzz/src/hb-subset-plan.cc

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/*
* Copyright © 2018 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): Garret Rieger, Roderick Sheeter
*/
#include "hb-subset-plan.hh"
#include "hb-subset-accelerator.hh"
#include "hb-map.hh"
#include "hb-multimap.hh"
#include "hb-set.hh"
#include "hb-ot-cmap-table.hh"
#include "hb-ot-glyf-table.hh"
#include "hb-ot-layout-gdef-table.hh"
#include "hb-ot-layout-gpos-table.hh"
#include "hb-ot-layout-gsub-table.hh"
#include "hb-ot-cff1-table.hh"
#include "hb-ot-cff2-table.hh"
#include "OT/Color/COLR/COLR.hh"
#include "OT/Color/COLR/colrv1-closure.hh"
#include "OT/Color/CPAL/CPAL.hh"
#include "hb-ot-var-fvar-table.hh"
#include "hb-ot-var-avar-table.hh"
#include "hb-ot-stat-table.hh"
#include "hb-ot-math-table.hh"
using OT::Layout::GSUB;
using OT::Layout::GPOS;
typedef hb_hashmap_t<unsigned, hb::unique_ptr<hb_set_t>> script_langsys_map;
#ifndef HB_NO_SUBSET_CFF
static inline bool
_add_cff_seac_components (const OT::cff1::accelerator_t &cff,
hb_codepoint_t gid,
hb_set_t *gids_to_retain)
{
hb_codepoint_t base_gid, accent_gid;
if (cff.get_seac_components (gid, &base_gid, &accent_gid))
{
gids_to_retain->add (base_gid);
gids_to_retain->add (accent_gid);
return true;
}
return false;
}
#endif
static void
_remap_palette_indexes (const hb_set_t *palette_indexes,
hb_map_t *mapping /* OUT */)
{
unsigned new_idx = 0;
for (unsigned palette_index : palette_indexes->iter ())
{
if (palette_index == 0xFFFF)
{
mapping->set (palette_index, palette_index);
continue;
}
mapping->set (palette_index, new_idx);
new_idx++;
}
}
static void
_remap_indexes (const hb_set_t *indexes,
hb_map_t *mapping /* OUT */)
{
for (auto _ : + hb_enumerate (indexes->iter ()))
mapping->set (_.second, _.first);
}
#ifndef HB_NO_SUBSET_LAYOUT
/*
* Removes all tags from 'tags' that are not in filter. Additionally eliminates any duplicates.
* Returns true if anything was removed (not including duplicates).
*/
static bool _filter_tag_list(hb_vector_t<hb_tag_t>* tags, /* IN/OUT */
const hb_set_t* filter)
{
hb_vector_t<hb_tag_t> out;
out.alloc (tags->get_size() + 1); // +1 is to allocate room for the null terminator.
bool removed = false;
hb_set_t visited;
for (hb_tag_t tag : *tags)
{
if (!tag) continue;
if (visited.has (tag)) continue;
if (!filter->has (tag))
{
removed = true;
continue;
}
visited.add (tag);
out.push (tag);
}
// The collect function needs a null element to signal end of the array.
out.push (HB_TAG_NONE);
hb_swap (out, *tags);
return removed;
}
template <typename T>
static void _collect_layout_indices (hb_subset_plan_t *plan,
const T& table,
hb_set_t *lookup_indices, /* OUT */
hb_set_t *feature_indices, /* OUT */
hb_hashmap_t<unsigned, hb::shared_ptr<hb_set_t>> *feature_record_cond_idx_map, /* OUT */
hb_hashmap_t<unsigned, const OT::Feature*> *feature_substitutes_map /* OUT */)
{
unsigned num_features = table.get_feature_count ();
hb_vector_t<hb_tag_t> features;
if (!plan->check_success (features.resize (num_features))) return;
table.get_feature_tags (0, &num_features, features.arrayZ);
bool retain_all_features = !_filter_tag_list (&features, &plan->layout_features);
unsigned num_scripts = table.get_script_count ();
hb_vector_t<hb_tag_t> scripts;
if (!plan->check_success (scripts.resize (num_scripts))) return;
table.get_script_tags (0, &num_scripts, scripts.arrayZ);
bool retain_all_scripts = !_filter_tag_list (&scripts, &plan->layout_scripts);
if (!plan->check_success (!features.in_error ()) || !features
|| !plan->check_success (!scripts.in_error ()) || !scripts)
return;
hb_ot_layout_collect_features (plan->source,
T::tableTag,
retain_all_scripts ? nullptr : scripts.arrayZ,
nullptr,
retain_all_features ? nullptr : features.arrayZ,
feature_indices);
#ifndef HB_NO_VAR
// collect feature substitutes with variations
if (!plan->user_axes_location.is_empty ())
{
hb_hashmap_t<hb::shared_ptr<hb_map_t>, unsigned> conditionset_map;
OT::hb_collect_feature_substitutes_with_var_context_t c =
{
&plan->axes_old_index_tag_map,
&plan->axes_location,
feature_record_cond_idx_map,
feature_substitutes_map,
feature_indices,
true,
0,
&conditionset_map
};
table.collect_feature_substitutes_with_variations (&c);
}
#endif
for (unsigned feature_index : *feature_indices)
{
const OT::Feature* f = &(table.get_feature (feature_index));
const OT::Feature **p = nullptr;
if (feature_substitutes_map->has (feature_index, &p))
f = *p;
f->add_lookup_indexes_to (lookup_indices);
}
// If all axes are pinned then all feature variations will be dropped so there's no need
// to collect lookups from them.
if (!plan->all_axes_pinned)
{
// TODO(qxliu76): this collection doesn't work correctly for feature variations that are dropped
// but not applied. The collection will collect and retain the lookup indices
// associated with those dropped but not activated rules. Since partial instancing
// isn't yet supported this isn't an issue yet but will need to be fixed for
// partial instancing.
table.feature_variation_collect_lookups (feature_indices, feature_substitutes_map, lookup_indices);
}
}
static inline void
_GSUBGPOS_find_duplicate_features (const OT::GSUBGPOS &g,
const hb_map_t *lookup_indices,
const hb_set_t *feature_indices,
const hb_hashmap_t<unsigned, const OT::Feature*> *feature_substitutes_map,
hb_map_t *duplicate_feature_map /* OUT */)
{
if (feature_indices->is_empty ()) return;
hb_hashmap_t<hb_tag_t, hb::unique_ptr<hb_set_t>> unique_features;
//find out duplicate features after subset
for (unsigned i : feature_indices->iter ())
{
hb_tag_t t = g.get_feature_tag (i);
if (t == HB_MAP_VALUE_INVALID) continue;
if (!unique_features.has (t))
{
if (unlikely (!unique_features.set (t, hb::unique_ptr<hb_set_t> {hb_set_create ()})))
return;
if (unique_features.has (t))
unique_features.get (t)->add (i);
duplicate_feature_map->set (i, i);
continue;
}
bool found = false;
hb_set_t* same_tag_features = unique_features.get (t);
for (unsigned other_f_index : same_tag_features->iter ())
{
const OT::Feature* f = &(g.get_feature (i));
const OT::Feature **p = nullptr;
if (feature_substitutes_map->has (i, &p))
f = *p;
const OT::Feature* other_f = &(g.get_feature (other_f_index));
if (feature_substitutes_map->has (other_f_index, &p))
other_f = *p;
auto f_iter =
+ hb_iter (f->lookupIndex)
| hb_filter (lookup_indices)
;
auto other_f_iter =
+ hb_iter (other_f->lookupIndex)
| hb_filter (lookup_indices)
;
bool is_equal = true;
for (; f_iter && other_f_iter; f_iter++, other_f_iter++)
{
unsigned a = *f_iter;
unsigned b = *other_f_iter;
if (a != b) { is_equal = false; break; }
}
if (is_equal == false || f_iter || other_f_iter) continue;
found = true;
duplicate_feature_map->set (i, other_f_index);
break;
}
if (found == false)
{
same_tag_features->add (i);
duplicate_feature_map->set (i, i);
}
}
}
template <typename T>
static inline void
_closure_glyphs_lookups_features (hb_subset_plan_t *plan,
hb_set_t *gids_to_retain,
hb_map_t *lookups,
hb_map_t *features,
script_langsys_map *langsys_map,
hb_hashmap_t<unsigned, hb::shared_ptr<hb_set_t>> *feature_record_cond_idx_map,
hb_hashmap_t<unsigned, const OT::Feature*> *feature_substitutes_map)
{
hb_blob_ptr_t<T> table = plan->source_table<T> ();
hb_tag_t table_tag = table->tableTag;
hb_set_t lookup_indices, feature_indices;
_collect_layout_indices<T> (plan,
*table,
&lookup_indices,
&feature_indices,
feature_record_cond_idx_map,
feature_substitutes_map);
if (table_tag == HB_OT_TAG_GSUB && !(plan->flags & HB_SUBSET_FLAGS_NO_LAYOUT_CLOSURE))
hb_ot_layout_lookups_substitute_closure (plan->source,
&lookup_indices,
gids_to_retain);
table->closure_lookups (plan->source,
gids_to_retain,
&lookup_indices);
_remap_indexes (&lookup_indices, lookups);
// prune features
table->prune_features (lookups,
plan->user_axes_location.is_empty () ? nullptr : feature_record_cond_idx_map,
feature_substitutes_map,
&feature_indices);
hb_map_t duplicate_feature_map;
_GSUBGPOS_find_duplicate_features (*table, lookups, &feature_indices, feature_substitutes_map, &duplicate_feature_map);
feature_indices.clear ();
table->prune_langsys (&duplicate_feature_map, &plan->layout_scripts, langsys_map, &feature_indices);
_remap_indexes (&feature_indices, features);
table.destroy ();
}
#endif
#ifndef HB_NO_VAR
static inline void
_generate_varstore_inner_maps (const hb_set_t& varidx_set,
unsigned subtable_count,
hb_vector_t<hb_inc_bimap_t> &inner_maps /* OUT */)
{
if (varidx_set.is_empty () || subtable_count == 0) return;
inner_maps.resize (subtable_count);
for (unsigned idx : varidx_set)
{
uint16_t major = idx >> 16;
uint16_t minor = idx & 0xFFFF;
if (major >= subtable_count)
continue;
inner_maps[major].add (minor);
}
}
static inline hb_font_t*
_get_hb_font_with_variations (const hb_subset_plan_t *plan)
{
hb_font_t *font = hb_font_create (plan->source);
hb_vector_t<hb_variation_t> vars;
if (!vars.alloc (plan->user_axes_location.get_population ())) {
hb_font_destroy (font);
return nullptr;
}
for (auto _ : plan->user_axes_location)
{
hb_variation_t var;
var.tag = _.first;
var.value = _.second;
vars.push (var);
}
#ifndef HB_NO_VAR
hb_font_set_variations (font, vars.arrayZ, plan->user_axes_location.get_population ());
#endif
return font;
}
static inline void
_collect_layout_variation_indices (hb_subset_plan_t* plan)
{
hb_blob_ptr_t<OT::GDEF> gdef = plan->source_table<OT::GDEF> ();
hb_blob_ptr_t<GPOS> gpos = plan->source_table<GPOS> ();
if (!gdef->has_data ())
{
gdef.destroy ();
gpos.destroy ();
return;
}
const OT::VariationStore *var_store = nullptr;
hb_set_t varidx_set;
hb_font_t *font = nullptr;
float *store_cache = nullptr;
bool collect_delta = plan->pinned_at_default ? false : true;
if (collect_delta)
{
if (unlikely (!plan->check_success (font = _get_hb_font_with_variations (plan)))) {
hb_font_destroy (font);
gdef.destroy ();
gpos.destroy ();
return;
}
if (gdef->has_var_store ())
{
var_store = &(gdef->get_var_store ());
store_cache = var_store->create_cache ();
}
}
OT::hb_collect_variation_indices_context_t c (&varidx_set,
&plan->layout_variation_idx_delta_map,
font, var_store,
&plan->_glyphset_gsub,
&plan->gpos_lookups,
store_cache);
gdef->collect_variation_indices (&c);
if (hb_ot_layout_has_positioning (plan->source))
gpos->collect_variation_indices (&c);
hb_font_destroy (font);
var_store->destroy_cache (store_cache);
gdef->remap_layout_variation_indices (&varidx_set, &plan->layout_variation_idx_delta_map);
unsigned subtable_count = gdef->has_var_store () ? gdef->get_var_store ().get_sub_table_count () : 0;
_generate_varstore_inner_maps (varidx_set, subtable_count, plan->gdef_varstore_inner_maps);
gdef.destroy ();
gpos.destroy ();
}
#endif
static inline void
_cmap_closure (hb_face_t *face,
const hb_set_t *unicodes,
hb_set_t *glyphset)
{
OT::cmap::accelerator_t cmap (face);
cmap.table->closure_glyphs (unicodes, glyphset);
}
static void _colr_closure (hb_face_t *face,
hb_map_t *layers_map,
hb_map_t *palettes_map,
hb_set_t *glyphs_colred)
{
OT::COLR::accelerator_t colr (face);
if (!colr.is_valid ()) return;
hb_set_t palette_indices, layer_indices;
// Collect all glyphs referenced by COLRv0
hb_set_t glyphset_colrv0;
for (hb_codepoint_t gid : *glyphs_colred)
colr.closure_glyphs (gid, &glyphset_colrv0);
glyphs_colred->union_ (glyphset_colrv0);
//closure for COLRv1
colr.closure_forV1 (glyphs_colred, &layer_indices, &palette_indices);
colr.closure_V0palette_indices (glyphs_colred, &palette_indices);
_remap_indexes (&layer_indices, layers_map);
_remap_palette_indexes (&palette_indices, palettes_map);
}
static inline void
_math_closure (hb_subset_plan_t *plan,
hb_set_t *glyphset)
{
hb_blob_ptr_t<OT::MATH> math = plan->source_table<OT::MATH> ();
if (math->has_data ())
math->closure_glyphs (glyphset);
math.destroy ();
}
static inline void
_remove_invalid_gids (hb_set_t *glyphs,
unsigned int num_glyphs)
{
glyphs->del_range (num_glyphs, HB_SET_VALUE_INVALID);
}
static void
_populate_unicodes_to_retain (const hb_set_t *unicodes,
const hb_set_t *glyphs,
hb_subset_plan_t *plan)
{
OT::cmap::accelerator_t cmap (plan->source);
unsigned size_threshold = plan->source->get_num_glyphs ();
if (glyphs->is_empty () && unicodes->get_population () < size_threshold)
{
const hb_map_t* unicode_to_gid = nullptr;
if (plan->accelerator)
unicode_to_gid = &plan->accelerator->unicode_to_gid;
// This is approach to collection is faster, but can only be used if glyphs
// are not being explicitly added to the subset and the input unicodes set is
// not excessively large (eg. an inverted set).
plan->unicode_to_new_gid_list.alloc (unicodes->get_population ());
if (!unicode_to_gid) {
for (hb_codepoint_t cp : *unicodes)
{
hb_codepoint_t gid;
if (!cmap.get_nominal_glyph (cp, &gid))
{
DEBUG_MSG(SUBSET, nullptr, "Drop U+%04X; no gid", cp);
continue;
}
plan->codepoint_to_glyph->set (cp, gid);
plan->unicode_to_new_gid_list.push (hb_pair (cp, gid));
}
} else {
// Use in memory unicode to gid map it's faster then looking up from
// the map. This code is mostly duplicated from above to avoid doing
// conditionals on the presence of the unicode_to_gid map each
// iteration.
for (hb_codepoint_t cp : *unicodes)
{
hb_codepoint_t gid = unicode_to_gid->get (cp);
if (gid == HB_MAP_VALUE_INVALID)
{
DEBUG_MSG(SUBSET, nullptr, "Drop U+%04X; no gid", cp);
continue;
}
plan->codepoint_to_glyph->set (cp, gid);
plan->unicode_to_new_gid_list.push (hb_pair (cp, gid));
}
}
}
else
{
// This approach is slower, but can handle adding in glyphs to the subset and will match
// them with cmap entries.
hb_map_t unicode_glyphid_map_storage;
hb_set_t cmap_unicodes_storage;
const hb_map_t* unicode_glyphid_map = &unicode_glyphid_map_storage;
const hb_set_t* cmap_unicodes = &cmap_unicodes_storage;
if (!plan->accelerator) {
cmap.collect_mapping (&cmap_unicodes_storage, &unicode_glyphid_map_storage);
plan->unicode_to_new_gid_list.alloc (hb_min(unicodes->get_population ()
+ glyphs->get_population (),
cmap_unicodes->get_population ()));
} else {
unicode_glyphid_map = &plan->accelerator->unicode_to_gid;
cmap_unicodes = &plan->accelerator->unicodes;
}
if (plan->accelerator &&
unicodes->get_population () < cmap_unicodes->get_population () &&
glyphs->get_population () < cmap_unicodes->get_population ())
{
auto &gid_to_unicodes = plan->accelerator->gid_to_unicodes;
for (hb_codepoint_t gid : *glyphs)
{
auto unicodes = gid_to_unicodes.get (gid);
for (hb_codepoint_t cp : unicodes)
{
plan->codepoint_to_glyph->set (cp, gid);
plan->unicode_to_new_gid_list.push (hb_pair (cp, gid));
}
}
for (hb_codepoint_t cp : *unicodes)
{
/* Don't double-add entry. */
if (plan->codepoint_to_glyph->has (cp))
continue;
hb_codepoint_t *gid;
if (!unicode_glyphid_map->has(cp, &gid))
continue;
plan->codepoint_to_glyph->set (cp, *gid);
plan->unicode_to_new_gid_list.push (hb_pair (cp, *gid));
}
plan->unicode_to_new_gid_list.qsort ();
}
else
{
for (hb_codepoint_t cp : *cmap_unicodes)
{
hb_codepoint_t gid = (*unicode_glyphid_map)[cp];
if (!unicodes->has (cp) && !glyphs->has (gid))
continue;
plan->codepoint_to_glyph->set (cp, gid);
plan->unicode_to_new_gid_list.push (hb_pair (cp, gid));
}
}
/* Add gids which where requested, but not mapped in cmap */
for (hb_codepoint_t gid : *glyphs)
{
if (gid >= plan->source->get_num_glyphs ())
break;
plan->_glyphset_gsub.add (gid);
}
}
auto &arr = plan->unicode_to_new_gid_list;
if (arr.length)
{
plan->unicodes.add_sorted_array (&arr.arrayZ->first, arr.length, sizeof (*arr.arrayZ));
plan->_glyphset_gsub.add_array (&arr.arrayZ->second, arr.length, sizeof (*arr.arrayZ));
}
}
#ifndef HB_COMPOSITE_OPERATIONS_PER_GLYPH
#define HB_COMPOSITE_OPERATIONS_PER_GLYPH 64
#endif
static unsigned
_glyf_add_gid_and_children (const OT::glyf_accelerator_t &glyf,
hb_codepoint_t gid,
hb_set_t *gids_to_retain,
int operation_count,
unsigned depth = 0)
{
if (unlikely (depth++ > HB_MAX_NESTING_LEVEL)) return operation_count;
if (unlikely (--operation_count < 0)) return operation_count;
/* Check if is already visited */
if (gids_to_retain->has (gid)) return operation_count;
gids_to_retain->add (gid);
for (auto item : glyf.glyph_for_gid (gid).get_composite_iterator ())
operation_count =
_glyf_add_gid_and_children (glyf,
item.get_gid (),
gids_to_retain,
operation_count,
depth);
return operation_count;
}
static void
_nameid_closure (hb_subset_plan_t* plan,
hb_set_t* drop_tables)
{
#ifndef HB_NO_STYLE
plan->source->table.STAT->collect_name_ids (&plan->user_axes_location, &plan->name_ids);
#endif
#ifndef HB_NO_VAR
if (!plan->all_axes_pinned)
plan->source->table.fvar->collect_name_ids (&plan->user_axes_location, &plan->name_ids);
#endif
if (!drop_tables->has (HB_OT_TAG_CPAL))
plan->source->table.CPAL->collect_name_ids (&plan->colr_palettes, &plan->name_ids);
#ifndef HB_NO_SUBSET_LAYOUT
if (!drop_tables->has (HB_OT_TAG_GPOS))
{
hb_blob_ptr_t<GPOS> gpos = plan->source_table<GPOS> ();
gpos->collect_name_ids (&plan->gpos_features, &plan->name_ids);
gpos.destroy ();
}
if (!drop_tables->has (HB_OT_TAG_GSUB))
{
hb_blob_ptr_t<GSUB> gsub = plan->source_table<GSUB> ();
gsub->collect_name_ids (&plan->gsub_features, &plan->name_ids);
gsub.destroy ();
}
#endif
}
static void
_populate_gids_to_retain (hb_subset_plan_t* plan,
hb_set_t* drop_tables)
{
OT::glyf_accelerator_t glyf (plan->source);
#ifndef HB_NO_SUBSET_CFF
OT::cff1::accelerator_t cff (plan->source);
#endif
plan->_glyphset_gsub.add (0); // Not-def
_cmap_closure (plan->source, &plan->unicodes, &plan->_glyphset_gsub);
#ifndef HB_NO_SUBSET_LAYOUT
if (!drop_tables->has (HB_OT_TAG_GSUB))
// closure all glyphs/lookups/features needed for GSUB substitutions.
_closure_glyphs_lookups_features<GSUB> (
plan,
&plan->_glyphset_gsub,
&plan->gsub_lookups,
&plan->gsub_features,
&plan->gsub_langsys,
&plan->gsub_feature_record_cond_idx_map,
&plan->gsub_feature_substitutes_map);
if (!drop_tables->has (HB_OT_TAG_GPOS))
_closure_glyphs_lookups_features<GPOS> (
plan,
&plan->_glyphset_gsub,
&plan->gpos_lookups,
&plan->gpos_features,
&plan->gpos_langsys,
&plan->gpos_feature_record_cond_idx_map,
&plan->gpos_feature_substitutes_map);
#endif
_remove_invalid_gids (&plan->_glyphset_gsub, plan->source->get_num_glyphs ());
plan->_glyphset_mathed = plan->_glyphset_gsub;
if (!drop_tables->has (HB_OT_TAG_MATH))
{
_math_closure (plan, &plan->_glyphset_mathed);
_remove_invalid_gids (&plan->_glyphset_mathed, plan->source->get_num_glyphs ());
}
hb_set_t cur_glyphset = plan->_glyphset_mathed;
if (!drop_tables->has (HB_OT_TAG_COLR))
{
_colr_closure (plan->source, &plan->colrv1_layers, &plan->colr_palettes, &cur_glyphset);
_remove_invalid_gids (&cur_glyphset, plan->source->get_num_glyphs ());
}
plan->_glyphset_colred = cur_glyphset;
_nameid_closure (plan, drop_tables);
/* Populate a full set of glyphs to retain by adding all referenced
* composite glyphs. */
if (glyf.has_data ())
for (hb_codepoint_t gid : cur_glyphset)
_glyf_add_gid_and_children (glyf, gid, &plan->_glyphset,
cur_glyphset.get_population () * HB_COMPOSITE_OPERATIONS_PER_GLYPH);
else
plan->_glyphset.union_ (cur_glyphset);
#ifndef HB_NO_SUBSET_CFF
if (!plan->accelerator || plan->accelerator->has_seac)
{
bool has_seac = false;
if (cff.is_valid ())
for (hb_codepoint_t gid : cur_glyphset)
if (_add_cff_seac_components (cff, gid, &plan->_glyphset))
has_seac = true;
plan->has_seac = has_seac;
}
#endif
_remove_invalid_gids (&plan->_glyphset, plan->source->get_num_glyphs ());
#ifndef HB_NO_VAR
if (!drop_tables->has (HB_OT_TAG_GDEF))
_collect_layout_variation_indices (plan);
#endif
}
static void
_create_glyph_map_gsub (const hb_set_t* glyph_set_gsub,
const hb_map_t* glyph_map,
hb_map_t* out)
{
+ hb_iter (glyph_set_gsub)
| hb_map ([&] (hb_codepoint_t gid) {
return hb_pair_t<hb_codepoint_t, hb_codepoint_t> (gid,
glyph_map->get (gid));
})
| hb_sink (out)
;
}
static void
_create_old_gid_to_new_gid_map (const hb_face_t *face,
bool retain_gids,
const hb_set_t *all_gids_to_retain,
hb_map_t *glyph_map, /* OUT */
hb_map_t *reverse_glyph_map, /* OUT */
unsigned int *num_glyphs /* OUT */)
{
unsigned pop = all_gids_to_retain->get_population ();
reverse_glyph_map->resize (pop);
glyph_map->resize (pop);
if (!retain_gids)
{
+ hb_enumerate (hb_iter (all_gids_to_retain), (hb_codepoint_t) 0)
| hb_sink (reverse_glyph_map)
;
*num_glyphs = reverse_glyph_map->get_population ();
}
else
{
+ hb_iter (all_gids_to_retain)
| hb_map ([] (hb_codepoint_t _) {
return hb_pair_t<hb_codepoint_t, hb_codepoint_t> (_, _);
})
| hb_sink (reverse_glyph_map)
;
hb_codepoint_t max_glyph = HB_SET_VALUE_INVALID;
hb_set_previous (all_gids_to_retain, &max_glyph);
*num_glyphs = max_glyph + 1;
}
+ reverse_glyph_map->iter ()
| hb_map (&hb_pair_t<hb_codepoint_t, hb_codepoint_t>::reverse)
| hb_sink (glyph_map)
;
}
#ifndef HB_NO_VAR
static void
_normalize_axes_location (hb_face_t *face, hb_subset_plan_t *plan)
{
if (plan->user_axes_location.is_empty ())
return;
hb_array_t<const OT::AxisRecord> axes = face->table.fvar->get_axes ();
plan->normalized_coords.resize (axes.length);
bool has_avar = face->table.avar->has_data ();
const OT::SegmentMaps *seg_maps = nullptr;
unsigned avar_axis_count = 0;
if (has_avar)
{
seg_maps = face->table.avar->get_segment_maps ();
avar_axis_count = face->table.avar->get_axis_count();
}
bool axis_not_pinned = false;
unsigned old_axis_idx = 0, new_axis_idx = 0;
for (const auto& axis : axes)
{
hb_tag_t axis_tag = axis.get_axis_tag ();
plan->axes_old_index_tag_map.set (old_axis_idx, axis_tag);
if (!plan->user_axes_location.has (axis_tag))
{
axis_not_pinned = true;
plan->axes_index_map.set (old_axis_idx, new_axis_idx);
new_axis_idx++;
}
else
{
int normalized_v = axis.normalize_axis_value (plan->user_axes_location.get (axis_tag));
if (has_avar && old_axis_idx < avar_axis_count)
{
normalized_v = seg_maps->map (normalized_v);
}
plan->axes_location.set (axis_tag, normalized_v);
if (normalized_v != 0)
plan->pinned_at_default = false;
plan->normalized_coords[old_axis_idx] = normalized_v;
}
old_axis_idx++;
if (has_avar && old_axis_idx < avar_axis_count)
seg_maps = &StructAfter<OT::SegmentMaps> (*seg_maps);
}
plan->all_axes_pinned = !axis_not_pinned;
}
static void
_update_instance_metrics_map_from_cff2 (hb_subset_plan_t *plan)
{
if (!plan->normalized_coords) return;
OT::cff2::accelerator_t cff2 (plan->source);
if (!cff2.is_valid ()) return;
hb_font_t *font = nullptr;
if (unlikely (!plan->check_success (font = _get_hb_font_with_variations (plan))))
{
hb_font_destroy (font);
return;
}
hb_glyph_extents_t extents = {0x7FFF, -0x7FFF};
OT::hmtx_accelerator_t _hmtx (plan->source);
float *hvar_store_cache = nullptr;
if (_hmtx.has_data () && _hmtx.var_table.get_length ())
hvar_store_cache = _hmtx.var_table->get_var_store ().create_cache ();
OT::vmtx_accelerator_t _vmtx (plan->source);
float *vvar_store_cache = nullptr;
if (_vmtx.has_data () && _vmtx.var_table.get_length ())
vvar_store_cache = _vmtx.var_table->get_var_store ().create_cache ();
for (auto p : *plan->glyph_map)
{
hb_codepoint_t old_gid = p.first;
hb_codepoint_t new_gid = p.second;
if (!cff2.get_extents (font, old_gid, &extents)) continue;
bool has_bounds_info = true;
if (extents.x_bearing == 0 && extents.width == 0 &&
extents.height == 0 && extents.y_bearing == 0)
has_bounds_info = false;
if (has_bounds_info)
{
plan->head_maxp_info.xMin = hb_min (plan->head_maxp_info.xMin, extents.x_bearing);
plan->head_maxp_info.xMax = hb_max (plan->head_maxp_info.xMax, extents.x_bearing + extents.width);
plan->head_maxp_info.yMax = hb_max (plan->head_maxp_info.yMax, extents.y_bearing);
plan->head_maxp_info.yMin = hb_min (plan->head_maxp_info.yMin, extents.y_bearing + extents.height);
}
if (_hmtx.has_data ())
{
int hori_aw = _hmtx.get_advance_without_var_unscaled (old_gid);
if (_hmtx.var_table.get_length ())
hori_aw += (int) roundf (_hmtx.var_table->get_advance_delta_unscaled (old_gid, font->coords, font->num_coords,
hvar_store_cache));
int lsb = extents.x_bearing;
if (!has_bounds_info)
{
if (!_hmtx.get_leading_bearing_without_var_unscaled (old_gid, &lsb))
continue;
}
plan->hmtx_map.set (new_gid, hb_pair ((unsigned) hori_aw, lsb));
plan->bounds_width_map.set (new_gid, extents.width);
}
if (_vmtx.has_data ())
{
int vert_aw = _vmtx.get_advance_without_var_unscaled (old_gid);
if (_vmtx.var_table.get_length ())
vert_aw += (int) roundf (_vmtx.var_table->get_advance_delta_unscaled (old_gid, font->coords, font->num_coords,
vvar_store_cache));
int tsb = extents.y_bearing;
if (!has_bounds_info)
{
if (!_vmtx.get_leading_bearing_without_var_unscaled (old_gid, &tsb))
continue;
}
plan->vmtx_map.set (new_gid, hb_pair ((unsigned) vert_aw, tsb));
plan->bounds_height_map.set (new_gid, extents.height);
}
}
hb_font_destroy (font);
if (hvar_store_cache)
_hmtx.var_table->get_var_store ().destroy_cache (hvar_store_cache);
if (vvar_store_cache)
_vmtx.var_table->get_var_store ().destroy_cache (vvar_store_cache);
}
#endif
hb_subset_plan_t::hb_subset_plan_t (hb_face_t *face,
const hb_subset_input_t *input)
{
successful = true;
flags = input->flags;
unicode_to_new_gid_list.init ();
name_ids = *input->sets.name_ids;
name_languages = *input->sets.name_languages;
layout_features = *input->sets.layout_features;
layout_scripts = *input->sets.layout_scripts;
glyphs_requested = *input->sets.glyphs;
drop_tables = *input->sets.drop_tables;
no_subset_tables = *input->sets.no_subset_tables;
source = hb_face_reference (face);
dest = hb_face_builder_create ();
codepoint_to_glyph = hb_map_create ();
glyph_map = hb_map_create ();
reverse_glyph_map = hb_map_create ();
gdef_varstore_inner_maps.init ();
user_axes_location = input->axes_location;
all_axes_pinned = false;
pinned_at_default = true;
#ifdef HB_EXPERIMENTAL_API
for (auto _ : input->name_table_overrides)
{
hb_bytes_t name_bytes = _.second;
unsigned len = name_bytes.length;
char *name_str = (char *) hb_malloc (len);
if (unlikely (!check_success (name_str)))
break;
hb_memcpy (name_str, name_bytes.arrayZ, len);
name_table_overrides.set (_.first, hb_bytes_t (name_str, len));
}
#endif
void* accel = hb_face_get_user_data(face, hb_subset_accelerator_t::user_data_key());
attach_accelerator_data = input->attach_accelerator_data;
force_long_loca = input->force_long_loca;
if (accel)
accelerator = (hb_subset_accelerator_t*) accel;
if (unlikely (in_error ()))
return;
#ifndef HB_NO_VAR
_normalize_axes_location (face, this);
#endif
_populate_unicodes_to_retain (input->sets.unicodes, input->sets.glyphs, this);
_populate_gids_to_retain (this, input->sets.drop_tables);
if (unlikely (in_error ()))
return;
_create_old_gid_to_new_gid_map (face,
input->flags & HB_SUBSET_FLAGS_RETAIN_GIDS,
&_glyphset,
glyph_map,
reverse_glyph_map,
&_num_output_glyphs);
_create_glyph_map_gsub (
&_glyphset_gsub,
glyph_map,
&glyph_map_gsub);
// Now that we have old to new gid map update the unicode to new gid list.
for (unsigned i = 0; i < unicode_to_new_gid_list.length; i++)
{
// Use raw array access for performance.
unicode_to_new_gid_list.arrayZ[i].second =
glyph_map->get(unicode_to_new_gid_list.arrayZ[i].second);
}
if (unlikely (in_error ()))
return;
#ifndef HB_NO_VAR
_update_instance_metrics_map_from_cff2 (this);
#endif
if (attach_accelerator_data)
{
hb_multimap_t gid_to_unicodes;
hb_map_t &unicode_to_gid = *codepoint_to_glyph;
for (auto unicode : unicodes)
{
auto gid = unicode_to_gid[unicode];
gid_to_unicodes.add (gid, unicode);
}
inprogress_accelerator =
hb_subset_accelerator_t::create (*codepoint_to_glyph,
gid_to_unicodes,
unicodes,
has_seac);
}
}
/**
* hb_subset_plan_create_or_fail:
* @face: font face to create the plan for.
* @input: a #hb_subset_input_t input.
*
* Computes a plan for subsetting the supplied face according
* to a provided input. The plan describes
* which tables and glyphs should be retained.
*
* Return value: (transfer full): New subset plan. Destroy with
* hb_subset_plan_destroy(). If there is a failure creating the plan
* nullptr will be returned.
*
* Since: 4.0.0
**/
hb_subset_plan_t *
hb_subset_plan_create_or_fail (hb_face_t *face,
const hb_subset_input_t *input)
{
hb_subset_plan_t *plan;
if (unlikely (!(plan = hb_object_create<hb_subset_plan_t> (face, input))))
return nullptr;
if (unlikely (plan->in_error ()))
{
hb_subset_plan_destroy (plan);
return nullptr;
}
return plan;
}
/**
* hb_subset_plan_destroy:
* @plan: a #hb_subset_plan_t
*
* Decreases the reference count on @plan, and if it reaches zero, destroys
* @plan, freeing all memory.
*
* Since: 4.0.0
**/
void
hb_subset_plan_destroy (hb_subset_plan_t *plan)
{
if (!hb_object_destroy (plan)) return;
hb_free (plan);
}
/**
* hb_subset_plan_old_to_new_glyph_mapping:
* @plan: a subsetting plan.
*
* Returns the mapping between glyphs in the original font to glyphs in the
* subset that will be produced by @plan
*
* Return value: (transfer none):
* A pointer to the #hb_map_t of the mapping.
*
* Since: 4.0.0
**/
hb_map_t *
hb_subset_plan_old_to_new_glyph_mapping (const hb_subset_plan_t *plan)
{
return plan->glyph_map;
}
/**
* hb_subset_plan_new_to_old_glyph_mapping:
* @plan: a subsetting plan.
*
* Returns the mapping between glyphs in the subset that will be produced by
* @plan and the glyph in the original font.
*
* Return value: (transfer none):
* A pointer to the #hb_map_t of the mapping.
*
* Since: 4.0.0
**/
hb_map_t *
hb_subset_plan_new_to_old_glyph_mapping (const hb_subset_plan_t *plan)
{
return plan->reverse_glyph_map;
}
/**
* hb_subset_plan_unicode_to_old_glyph_mapping:
* @plan: a subsetting plan.
*
* Returns the mapping between codepoints in the original font and the
* associated glyph id in the original font.
*
* Return value: (transfer none):
* A pointer to the #hb_map_t of the mapping.
*
* Since: 4.0.0
**/
hb_map_t *
hb_subset_plan_unicode_to_old_glyph_mapping (const hb_subset_plan_t *plan)
{
return plan->codepoint_to_glyph;
}
/**
* hb_subset_plan_reference: (skip)
* @plan: a #hb_subset_plan_t object.
*
* Increases the reference count on @plan.
*
* Return value: @plan.
*
* Since: 4.0.0
**/
hb_subset_plan_t *
hb_subset_plan_reference (hb_subset_plan_t *plan)
{
return hb_object_reference (plan);
}
/**
* hb_subset_plan_set_user_data: (skip)
* @plan: a #hb_subset_plan_t object.
* @key: The user-data key to set
* @data: A pointer to the user data
* @destroy: (nullable): A callback to call when @data is not needed anymore
* @replace: Whether to replace an existing data with the same key
*
* Attaches a user-data key/data pair to the given subset plan object.
*
* Return value: `true` if success, `false` otherwise
*
* Since: 4.0.0
**/
hb_bool_t
hb_subset_plan_set_user_data (hb_subset_plan_t *plan,
hb_user_data_key_t *key,
void *data,
hb_destroy_func_t destroy,
hb_bool_t replace)
{
return hb_object_set_user_data (plan, key, data, destroy, replace);
}
/**
* hb_subset_plan_get_user_data: (skip)
* @plan: a #hb_subset_plan_t object.
* @key: The user-data key to query
*
* Fetches the user data associated with the specified key,
* attached to the specified subset plan object.
*
* Return value: (transfer none): A pointer to the user data
*
* Since: 4.0.0
**/
void *
hb_subset_plan_get_user_data (const hb_subset_plan_t *plan,
hb_user_data_key_t *key)
{
return hb_object_get_user_data (plan, key);
}
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