harfbuzz/src/hb-subset-plan.cc

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2018-02-06 00:22:30 +01:00
/*
* 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
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*/
#include "hb-subset-plan.hh"
#include "hb-map.hh"
#include "hb-set.hh"
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#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"
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#include "hb-ot-color-colr-table.hh"
#include "hb-ot-color-colrv1-closure.hh"
#include "hb-ot-var-fvar-table.hh"
#include "hb-ot-stat-table.hh"
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#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;
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#ifndef HB_NO_SUBSET_CFF
static inline void
_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);
}
}
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#endif
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static void
_remap_palette_indexes (const hb_set_t *palette_indexes,
hb_map_t *mapping /* OUT */)
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{
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++;
}
}
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static void
_remap_indexes (const hb_set_t *indexes,
hb_map_t *mapping /* OUT */)
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{
unsigned count = indexes->get_population ();
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for (auto _ : + hb_zip (indexes->iter (), hb_range (count)))
mapping->set (_.first, _.second);
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}
#ifndef HB_NO_SUBSET_LAYOUT
typedef void (*layout_collect_func_t) (hb_face_t *face, hb_tag_t table_tag, const hb_tag_t *scripts, const hb_tag_t *languages, const hb_tag_t *features, hb_set_t *lookup_indexes /* OUT */);
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/*
* 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,
layout_collect_func_t layout_collect_func,
hb_set_t *indices /* 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;
layout_collect_func (plan->source,
T::tableTag,
retain_all_scripts ? nullptr : scripts.arrayZ,
nullptr,
retain_all_features ? nullptr : features.arrayZ,
indices);
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}
static inline void
_GSUBGPOS_find_duplicate_features (const OT::GSUBGPOS &g,
const hb_map_t *lookup_indices,
const hb_set_t *feature_indices,
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& other_f = g.get_feature (other_f_index);
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>
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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)
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{
hb_blob_ptr_t<T> table = plan->source_table<T> ();
hb_tag_t table_tag = table->tableTag;
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hb_set_t lookup_indices;
_collect_layout_indices<T> (plan,
*table,
hb_ot_layout_collect_lookups,
&lookup_indices);
if (table_tag == HB_OT_TAG_GSUB)
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);
// Collect and prune features
hb_set_t feature_indices;
_collect_layout_indices<T> (plan,
*table,
hb_ot_layout_collect_features,
&feature_indices);
table->prune_features (lookups, &feature_indices);
hb_map_t duplicate_feature_map;
_GSUBGPOS_find_duplicate_features (*table, lookups, &feature_indices, &duplicate_feature_map);
feature_indices.clear ();
table->prune_langsys (&duplicate_feature_map, langsys_map, &feature_indices);
_remap_indexes (&feature_indices, features);
table.destroy ();
}
#endif
#ifndef HB_NO_VAR
static inline void
_collect_layout_variation_indices (hb_subset_plan_t* plan,
const hb_set_t *glyphset,
const hb_map_t *gpos_lookups,
hb_set_t *layout_variation_indices,
hb_map_t *layout_variation_idx_map)
{
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;
}
OT::hb_collect_variation_indices_context_t c (layout_variation_indices, glyphset, gpos_lookups);
gdef->collect_variation_indices (&c);
if (hb_ot_layout_has_positioning (plan->source))
gpos->collect_variation_indices (&c);
gdef->remap_layout_variation_indices (layout_variation_indices, layout_variation_idx_map);
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gdef.destroy ();
gpos.destroy ();
}
#endif
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static inline void
_cmap_closure (hb_face_t *face,
const hb_set_t *unicodes,
hb_set_t *glyphset)
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{
OT::cmap::accelerator_t cmap (face);
cmap.table->closure_glyphs (unicodes, glyphset);
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}
static void _colr_closure (hb_face_t *face,
hb_map_t *layers_map,
hb_map_t *palettes_map,
hb_set_t *glyphs_colred)
{
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OT::COLR::accelerator_t colr (face);
if (!colr.is_valid ()) return;
unsigned iteration_count = 0;
hb_set_t palette_indices, layer_indices;
unsigned glyphs_num;
{
glyphs_num = glyphs_colred->get_population ();
// Collect all glyphs referenced by COLRv0
hb_set_t glyphset_colrv0;
for (hb_codepoint_t gid : glyphs_colred->iter ())
colr.closure_glyphs (gid, &glyphset_colrv0);
glyphs_colred->union_ (glyphset_colrv0);
//closure for COLRv1
colr.closure_forV1 (glyphs_colred, &layer_indices, &palette_indices);
} while (iteration_count++ <= HB_CLOSURE_MAX_STAGES &&
glyphs_num != glyphs_colred->get_population ());
colr.closure_V0palette_indices (glyphs_colred, &palette_indices);
_remap_indexes (&layer_indices, layers_map);
_remap_palette_indexes (&palette_indices, palettes_map);
}
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static inline void
_math_closure (hb_subset_plan_t *plan,
hb_set_t *glyphset)
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{
hb_blob_ptr_t<OT::MATH> math = plan->source_table<OT::MATH> ();
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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)
{
[subset] Remove switch to alternate unicode collection at large subset sizes. Benchmarks show that the first path is always faster even at large subset sizes: BM_subset_codepoints/subset_roboto/10_median +0.0324 +0.0325 0 0 0 0 BM_subset_codepoints/subset_roboto/64_median +0.0253 +0.0255 0 1 0 1 BM_subset_codepoints/subset_roboto/512_median +0.0126 +0.0128 1 1 1 1 BM_subset_codepoints/subset_roboto/4000_median +0.0500 +0.0491 6 7 6 7 BM_subset_codepoints/subset_amiri/10_median +0.0338 +0.0332 1 1 1 1 BM_subset_codepoints/subset_amiri/64_median +0.0238 +0.0234 1 1 1 1 BM_subset_codepoints/subset_amiri/512_median +0.0066 +0.0063 8 8 8 8 BM_subset_codepoints/subset_amiri/4000_median -0.0011 -0.0012 13 13 13 13 BM_subset_codepoints/subset_noto_nastaliq_urdu/10_median +0.0226 +0.0226 0 0 0 0 BM_subset_codepoints/subset_noto_nastaliq_urdu/64_median +0.0047 +0.0044 20 20 20 20 BM_subset_codepoints/subset_noto_nastaliq_urdu/512_median +0.0022 +0.0021 165 166 165 166 BM_subset_codepoints/subset_noto_nastaliq_urdu/1000_median -0.0021 -0.0023 166 166 166 165 BM_subset_codepoints/subset_noto_devangari/10_median +0.0054 +0.0054 0 0 0 0 BM_subset_codepoints/subset_noto_devangari/64_median +0.0024 +0.0019 0 0 0 0 BM_subset_codepoints/subset_noto_devangari/512_median +0.0089 +0.0090 5 5 5 5 BM_subset_codepoints/subset_noto_devangari/1000_median -0.0028 -0.0019 5 5 5 5 BM_subset_codepoints/subset_mplus1p/10_median +0.0001 +0.0002 0 0 0 0 BM_subset_codepoints/subset_mplus1p/64_median +0.0073 +0.0075 1 1 1 1 BM_subset_codepoints/subset_mplus1p/512_median +0.0034 +0.0034 1 1 1 1 BM_subset_codepoints/subset_mplus1p/4096_median -0.1248 -0.1248 7 6 7 6 BM_subset_codepoints/subset_mplus1p/10000_median -0.0885 -0.0885 13 12 13 12 BM_subset_codepoints/subset_notocjk/10_median +0.0031 +0.0032 2 2 2 2 BM_subset_codepoints/subset_notocjk/64_median -0.0010 -0.0010 2 2 2 2 BM_subset_codepoints/subset_notocjk/512_median -0.0023 -0.0023 9 9 9 9 BM_subset_codepoints/subset_notocjk/4096_median -0.1725 -0.1726 28 23 28 23 BM_subset_codepoints/subset_notocjk/32768_median -0.0277 -0.0287 140 137 140 136 BM_subset_codepoints/subset_notocjk/100000_median -0.0929 -0.0926 162 147 162 147
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// 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 ());
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));
}
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}
else
{
[subset] Remove switch to alternate unicode collection at large subset sizes. Benchmarks show that the first path is always faster even at large subset sizes: BM_subset_codepoints/subset_roboto/10_median +0.0324 +0.0325 0 0 0 0 BM_subset_codepoints/subset_roboto/64_median +0.0253 +0.0255 0 1 0 1 BM_subset_codepoints/subset_roboto/512_median +0.0126 +0.0128 1 1 1 1 BM_subset_codepoints/subset_roboto/4000_median +0.0500 +0.0491 6 7 6 7 BM_subset_codepoints/subset_amiri/10_median +0.0338 +0.0332 1 1 1 1 BM_subset_codepoints/subset_amiri/64_median +0.0238 +0.0234 1 1 1 1 BM_subset_codepoints/subset_amiri/512_median +0.0066 +0.0063 8 8 8 8 BM_subset_codepoints/subset_amiri/4000_median -0.0011 -0.0012 13 13 13 13 BM_subset_codepoints/subset_noto_nastaliq_urdu/10_median +0.0226 +0.0226 0 0 0 0 BM_subset_codepoints/subset_noto_nastaliq_urdu/64_median +0.0047 +0.0044 20 20 20 20 BM_subset_codepoints/subset_noto_nastaliq_urdu/512_median +0.0022 +0.0021 165 166 165 166 BM_subset_codepoints/subset_noto_nastaliq_urdu/1000_median -0.0021 -0.0023 166 166 166 165 BM_subset_codepoints/subset_noto_devangari/10_median +0.0054 +0.0054 0 0 0 0 BM_subset_codepoints/subset_noto_devangari/64_median +0.0024 +0.0019 0 0 0 0 BM_subset_codepoints/subset_noto_devangari/512_median +0.0089 +0.0090 5 5 5 5 BM_subset_codepoints/subset_noto_devangari/1000_median -0.0028 -0.0019 5 5 5 5 BM_subset_codepoints/subset_mplus1p/10_median +0.0001 +0.0002 0 0 0 0 BM_subset_codepoints/subset_mplus1p/64_median +0.0073 +0.0075 1 1 1 1 BM_subset_codepoints/subset_mplus1p/512_median +0.0034 +0.0034 1 1 1 1 BM_subset_codepoints/subset_mplus1p/4096_median -0.1248 -0.1248 7 6 7 6 BM_subset_codepoints/subset_mplus1p/10000_median -0.0885 -0.0885 13 12 13 12 BM_subset_codepoints/subset_notocjk/10_median +0.0031 +0.0032 2 2 2 2 BM_subset_codepoints/subset_notocjk/64_median -0.0010 -0.0010 2 2 2 2 BM_subset_codepoints/subset_notocjk/512_median -0.0023 -0.0023 9 9 9 9 BM_subset_codepoints/subset_notocjk/4096_median -0.1725 -0.1726 28 23 28 23 BM_subset_codepoints/subset_notocjk/32768_median -0.0277 -0.0287 140 137 140 136 BM_subset_codepoints/subset_notocjk/100000_median -0.0929 -0.0926 162 147 162 147
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// 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;
hb_set_t cmap_unicodes;
cmap.collect_mapping (&cmap_unicodes, &unicode_glyphid_map);
plan->unicode_to_new_gid_list.alloc (hb_min(unicodes->get_population ()
+ glyphs->get_population (),
cmap_unicodes.get_population ()));
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));
}
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/* Add gids which where requested, but not mapped in cmap */
for (hb_codepoint_t gid : *glyphs)
{
if (gid >= plan->source->get_num_glyphs ())
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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.glyphIndex,
gids_to_retain,
operation_count,
depth);
return operation_count;
}
static void
_populate_gids_to_retain (hb_subset_plan_t* plan,
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bool close_over_gsub,
bool close_over_gpos,
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bool close_over_gdef)
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{
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OT::glyf_accelerator_t glyf (plan->source);
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#ifndef HB_NO_SUBSET_CFF
OT::cff1::accelerator_t cff (plan->source);
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#endif
plan->_glyphset_gsub->add (0); // Not-def
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_cmap_closure (plan->source, plan->unicodes, plan->_glyphset_gsub);
#ifndef HB_NO_SUBSET_LAYOUT
if (close_over_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);
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if (close_over_gpos)
_closure_glyphs_lookups_features<GPOS> (
plan,
plan->_glyphset_gsub,
plan->gpos_lookups,
plan->gpos_features,
plan->gpos_langsys);
#endif
_remove_invalid_gids (plan->_glyphset_gsub, plan->source->get_num_glyphs ());
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hb_set_set (plan->_glyphset_mathed, plan->_glyphset_gsub);
_math_closure (plan, plan->_glyphset_mathed);
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_remove_invalid_gids (plan->_glyphset_mathed, plan->source->get_num_glyphs ());
hb_set_t cur_glyphset = *plan->_glyphset_mathed;
_colr_closure (plan->source, plan->colrv1_layers, plan->colr_palettes, &cur_glyphset);
_remove_invalid_gids (&cur_glyphset, plan->source->get_num_glyphs ());
hb_set_set (plan->_glyphset_colred, &cur_glyphset);
/* 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 (cff.is_valid ())
for (hb_codepoint_t gid : cur_glyphset)
_add_cff_seac_components (cff, gid, plan->_glyphset);
#endif
_remove_invalid_gids (plan->_glyphset, plan->source->get_num_glyphs ());
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#ifndef HB_NO_VAR
if (close_over_gdef)
_collect_layout_variation_indices (plan,
plan->_glyphset_gsub,
plan->gpos_lookups,
plan->layout_variation_indices,
plan->layout_variation_idx_map);
#endif
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}
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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)
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| hb_map ([] (hb_codepoint_t _) {
return hb_pair_t<hb_codepoint_t, hb_codepoint_t> (_, _);
})
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| 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)
;
}
static void
_nameid_closure (hb_face_t *face,
hb_set_t *nameids)
{
#ifndef HB_NO_STYLE
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face->table.STAT->collect_name_ids (nameids);
#endif
#ifndef HB_NO_VAR
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face->table.fvar->collect_name_ids (nameids);
#endif
}
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/**
* hb_subset_plan_create_or_fail:
* @face: font face to create the plan for.
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* @input: a #hb_subset_input_t input.
*
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* Computes a plan for subsetting the supplied face according
* to a provided input. The plan describes
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* which tables and glyphs should be retained.
*
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* 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.
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*
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* Since: 4.0.0
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**/
hb_subset_plan_t *
hb_subset_plan_create_or_fail (hb_face_t *face,
const hb_subset_input_t *input)
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{
hb_subset_plan_t *plan;
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if (unlikely (!(plan = hb_object_create<hb_subset_plan_t> ())))
return nullptr;
plan->successful = true;
plan->flags = input->flags;
plan->unicodes = hb_set_create ();
plan->unicode_to_new_gid_list.init ();
plan->name_ids = hb_set_copy (input->sets.name_ids);
_nameid_closure (face, plan->name_ids);
plan->name_languages = hb_set_copy (input->sets.name_languages);
plan->layout_features = hb_set_copy (input->sets.layout_features);
plan->layout_scripts = hb_set_copy (input->sets.layout_scripts);
plan->glyphs_requested = hb_set_copy (input->sets.glyphs);
plan->drop_tables = hb_set_copy (input->sets.drop_tables);
plan->no_subset_tables = hb_set_copy (input->sets.no_subset_tables);
plan->source = hb_face_reference (face);
plan->dest = hb_face_builder_create ();
plan->_glyphset = hb_set_create ();
plan->_glyphset_gsub = hb_set_create ();
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plan->_glyphset_mathed = hb_set_create ();
plan->_glyphset_colred = hb_set_create ();
plan->codepoint_to_glyph = hb_map_create ();
plan->glyph_map = hb_map_create ();
plan->reverse_glyph_map = hb_map_create ();
plan->glyph_map_gsub = hb_map_create ();
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plan->gsub_lookups = hb_map_create ();
plan->gpos_lookups = hb_map_create ();
if (plan->check_success (plan->gsub_langsys = hb_object_create<script_langsys_map> ()))
plan->gsub_langsys->init_shallow ();
if (plan->check_success (plan->gpos_langsys = hb_object_create<script_langsys_map> ()))
plan->gpos_langsys->init_shallow ();
plan->gsub_features = hb_map_create ();
plan->gpos_features = hb_map_create ();
plan->colrv1_layers = hb_map_create ();
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plan->colr_palettes = hb_map_create ();
plan->layout_variation_indices = hb_set_create ();
plan->layout_variation_idx_map = hb_map_create ();
if ((plan->sanitized_table_cache = hb_object_create<hb_hashmap_t<hb_tag_t, hb::unique_ptr<hb_blob_t>>> ())) {
plan->sanitized_table_cache->init_shallow ();
}
if (unlikely (plan->in_error ())) {
hb_subset_plan_destroy (plan);
return nullptr;
}
_populate_unicodes_to_retain (input->sets.unicodes, input->sets.glyphs, plan);
_populate_gids_to_retain (plan,
!input->sets.drop_tables->has (HB_OT_TAG_GSUB),
!input->sets.drop_tables->has (HB_OT_TAG_GPOS),
!input->sets.drop_tables->has (HB_OT_TAG_GDEF));
_create_old_gid_to_new_gid_map (face,
input->flags & HB_SUBSET_FLAGS_RETAIN_GIDS,
plan->_glyphset,
plan->glyph_map,
plan->reverse_glyph_map,
&plan->_num_output_glyphs);
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_create_glyph_map_gsub (
plan->_glyphset_gsub,
plan->glyph_map,
plan->glyph_map_gsub);
// Now that we have old to new gid map update the unicode to new gid list.
for (unsigned i = 0; i < plan->unicode_to_new_gid_list.length; i++)
{
// Use raw array access for performance.
plan->unicode_to_new_gid_list.arrayZ[i].second =
plan->glyph_map->get(plan->unicode_to_new_gid_list.arrayZ[i].second);
}
if (unlikely (plan->in_error ())) {
hb_subset_plan_destroy (plan);
return nullptr;
}
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return plan;
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}
/**
* hb_subset_plan_destroy:
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* @plan: a #hb_subset_plan_t
*
* Decreases the reference count on @plan, and if it reaches zero, destroys
* @plan, freeing all memory.
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*
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* Since: 4.0.0
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**/
void
hb_subset_plan_destroy (hb_subset_plan_t *plan)
{
if (!hb_object_destroy (plan)) return;
hb_set_destroy (plan->unicodes);
plan->unicode_to_new_gid_list.fini ();
hb_set_destroy (plan->name_ids);
hb_set_destroy (plan->name_languages);
hb_set_destroy (plan->layout_features);
hb_set_destroy (plan->layout_scripts);
hb_set_destroy (plan->glyphs_requested);
hb_set_destroy (plan->drop_tables);
hb_set_destroy (plan->no_subset_tables);
hb_face_destroy (plan->source);
hb_face_destroy (plan->dest);
hb_map_destroy (plan->codepoint_to_glyph);
hb_map_destroy (plan->glyph_map);
hb_map_destroy (plan->reverse_glyph_map);
hb_map_destroy (plan->glyph_map_gsub);
hb_set_destroy (plan->_glyphset);
hb_set_destroy (plan->_glyphset_gsub);
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hb_set_destroy (plan->_glyphset_mathed);
hb_set_destroy (plan->_glyphset_colred);
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hb_map_destroy (plan->gsub_lookups);
hb_map_destroy (plan->gpos_lookups);
hb_map_destroy (plan->gsub_features);
hb_map_destroy (plan->gpos_features);
hb_map_destroy (plan->colrv1_layers);
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hb_map_destroy (plan->colr_palettes);
hb_set_destroy (plan->layout_variation_indices);
hb_map_destroy (plan->layout_variation_idx_map);
if (plan->gsub_langsys)
{
hb_object_destroy (plan->gsub_langsys);
plan->gsub_langsys->fini_shallow ();
hb_free (plan->gsub_langsys);
}
if (plan->gpos_langsys)
{
hb_object_destroy (plan->gpos_langsys);
plan->gpos_langsys->fini_shallow ();
hb_free (plan->gpos_langsys);
}
if (plan->sanitized_table_cache) {
hb_object_destroy (plan->sanitized_table_cache);
plan->sanitized_table_cache->fini ();
hb_free (plan->sanitized_table_cache);
}
hb_free (plan);
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}
/**
* 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.
*
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* Since: 4.0.0
**/
const 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.
*
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* Since: 4.0.0
**/
const hb_map_t*
hb_subset_plan_new_to_old_glyph_mapping (const hb_subset_plan_t *plan)
{
return plan->reverse_glyph_map;
}
/**
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* 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.
*
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* Since: 4.0.0
**/
const 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.
*
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* 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
*
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* 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
*
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* 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);
}