396 lines
11 KiB
C++
396 lines
11 KiB
C++
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/*
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* Copyright © 2018 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Garret Rieger, Roderick Sheeter
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*/
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#include "hb-subset-plan.hh"
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#include "hb-map.hh"
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#include "hb-set.hh"
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#include "hb-ot-cmap-table.hh"
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#include "hb-ot-glyf-table.hh"
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#include "hb-ot-layout-gdef-table.hh"
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#include "hb-ot-layout-gpos-table.hh"
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#include "hb-ot-layout-gsub-table.hh"
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#include "hb-ot-cff1-table.hh"
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#include "hb-ot-color-colr-table.hh"
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#include "hb-ot-var-fvar-table.hh"
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#include "hb-ot-stat-table.hh"
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#ifndef HB_NO_SUBSET_CFF
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static inline void
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_add_cff_seac_components (const OT::cff1::accelerator_t &cff,
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hb_codepoint_t gid,
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hb_set_t *gids_to_retain)
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{
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hb_codepoint_t base_gid, accent_gid;
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if (cff.get_seac_components (gid, &base_gid, &accent_gid))
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{
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gids_to_retain->add (base_gid);
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gids_to_retain->add (accent_gid);
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}
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}
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#endif
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#ifndef HB_NO_SUBSET_LAYOUT
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static void
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_remap_indexes (const hb_set_t *indexes,
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hb_map_t *mapping /* OUT */)
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{
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unsigned count = indexes->get_population ();
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for (auto _ : + hb_zip (indexes->iter (), hb_range (count)))
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mapping->set (_.first, _.second);
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}
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static inline void
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_gsub_closure_glyphs_lookups_features (hb_face_t *face,
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hb_set_t *gids_to_retain,
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hb_map_t *gsub_lookups,
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hb_map_t *gsub_features)
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{
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hb_set_t lookup_indices;
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hb_ot_layout_collect_lookups (face,
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HB_OT_TAG_GSUB,
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nullptr,
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nullptr,
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nullptr,
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&lookup_indices);
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hb_ot_layout_lookups_substitute_closure (face,
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&lookup_indices,
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gids_to_retain);
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hb_blob_ptr_t<OT::GSUB> gsub = hb_sanitize_context_t ().reference_table<OT::GSUB> (face);
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gsub->closure_lookups (face,
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gids_to_retain,
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&lookup_indices);
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_remap_indexes (&lookup_indices, gsub_lookups);
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//closure features
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hb_set_t feature_indices;
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gsub->closure_features (gsub_lookups, &feature_indices);
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_remap_indexes (&feature_indices, gsub_features);
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gsub.destroy ();
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}
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static inline void
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_gpos_closure_lookups_features (hb_face_t *face,
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const hb_set_t *gids_to_retain,
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hb_map_t *gpos_lookups,
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hb_map_t *gpos_features)
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{
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hb_set_t lookup_indices;
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hb_ot_layout_collect_lookups (face,
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HB_OT_TAG_GPOS,
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nullptr,
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nullptr,
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nullptr,
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&lookup_indices);
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hb_blob_ptr_t<OT::GPOS> gpos = hb_sanitize_context_t ().reference_table<OT::GPOS> (face);
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gpos->closure_lookups (face,
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gids_to_retain,
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&lookup_indices);
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_remap_indexes (&lookup_indices, gpos_lookups);
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//closure features
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hb_set_t feature_indices;
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gpos->closure_features (gpos_lookups, &feature_indices);
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_remap_indexes (&feature_indices, gpos_features);
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gpos.destroy ();
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}
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#endif
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#ifndef HB_NO_VAR
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static inline void
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_collect_layout_variation_indices (hb_face_t *face,
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const hb_set_t *glyphset,
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const hb_map_t *gpos_lookups,
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hb_set_t *layout_variation_indices,
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hb_map_t *layout_variation_idx_map)
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{
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hb_blob_ptr_t<OT::GDEF> gdef = hb_sanitize_context_t ().reference_table<OT::GDEF> (face);
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hb_blob_ptr_t<OT::GPOS> gpos = hb_sanitize_context_t ().reference_table<OT::GPOS> (face);
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if (!gdef->has_data ())
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{
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gdef.destroy ();
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gpos.destroy ();
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return;
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}
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OT::hb_collect_variation_indices_context_t c (layout_variation_indices, glyphset, gpos_lookups);
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gdef->collect_variation_indices (&c);
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if (hb_ot_layout_has_positioning (face))
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gpos->collect_variation_indices (&c);
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gdef->remap_layout_variation_indices (layout_variation_indices, layout_variation_idx_map);
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gdef.destroy ();
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gpos.destroy ();
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}
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#endif
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static inline void
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_cmap_closure (hb_face_t *face,
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const hb_set_t *unicodes,
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hb_set_t *glyphset)
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{
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OT::cmap::accelerator_t cmap;
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cmap.init (face);
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cmap.table->closure_glyphs (unicodes, glyphset);
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cmap.fini ();
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}
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static inline void
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_remove_invalid_gids (hb_set_t *glyphs,
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unsigned int num_glyphs)
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{
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hb_codepoint_t gid = HB_SET_VALUE_INVALID;
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while (glyphs->next (&gid))
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{
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if (gid >= num_glyphs)
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glyphs->del (gid);
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}
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}
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static void
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_populate_gids_to_retain (hb_subset_plan_t* plan,
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const hb_set_t *unicodes,
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const hb_set_t *input_glyphs_to_retain,
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bool close_over_gsub,
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bool close_over_gpos,
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bool close_over_gdef)
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{
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OT::cmap::accelerator_t cmap;
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OT::glyf::accelerator_t glyf;
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#ifndef HB_NO_SUBSET_CFF
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OT::cff1::accelerator_t cff;
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#endif
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OT::COLR::accelerator_t colr;
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cmap.init (plan->source);
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glyf.init (plan->source);
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#ifndef HB_NO_SUBSET_CFF
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cff.init (plan->source);
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#endif
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colr.init (plan->source);
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plan->_glyphset_gsub->add (0); // Not-def
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hb_set_union (plan->_glyphset_gsub, input_glyphs_to_retain);
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hb_codepoint_t cp = HB_SET_VALUE_INVALID;
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while (unicodes->next (&cp))
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{
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hb_codepoint_t gid;
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if (!cmap.get_nominal_glyph (cp, &gid))
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{
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DEBUG_MSG(SUBSET, nullptr, "Drop U+%04X; no gid", cp);
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continue;
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}
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plan->unicodes->add (cp);
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plan->codepoint_to_glyph->set (cp, gid);
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plan->_glyphset_gsub->add (gid);
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}
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_cmap_closure (plan->source, plan->unicodes, plan->_glyphset_gsub);
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#ifndef HB_NO_SUBSET_LAYOUT
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if (close_over_gsub)
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// closure all glyphs/lookups/features needed for GSUB substitutions.
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_gsub_closure_glyphs_lookups_features (plan->source, plan->_glyphset_gsub, plan->gsub_lookups, plan->gsub_features);
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if (close_over_gpos)
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_gpos_closure_lookups_features (plan->source, plan->_glyphset_gsub, plan->gpos_lookups, plan->gpos_features);
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#endif
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_remove_invalid_gids (plan->_glyphset_gsub, plan->source->get_num_glyphs ());
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// Populate a full set of glyphs to retain by adding all referenced
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// composite glyphs.
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hb_codepoint_t gid = HB_SET_VALUE_INVALID;
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while (plan->_glyphset_gsub->next (&gid))
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{
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glyf.add_gid_and_children (gid, plan->_glyphset);
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#ifndef HB_NO_SUBSET_CFF
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if (cff.is_valid ())
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_add_cff_seac_components (cff, gid, plan->_glyphset);
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#endif
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if (colr.is_valid ())
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colr.closure_glyphs (gid, plan->_glyphset);
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}
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_remove_invalid_gids (plan->_glyphset, plan->source->get_num_glyphs ());
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#ifndef HB_NO_VAR
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if (close_over_gdef)
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_collect_layout_variation_indices (plan->source, plan->_glyphset, plan->gpos_lookups, plan->layout_variation_indices, plan->layout_variation_idx_map);
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#endif
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#ifndef HB_NO_SUBSET_CFF
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cff.fini ();
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#endif
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glyf.fini ();
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cmap.fini ();
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}
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static void
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_create_old_gid_to_new_gid_map (const hb_face_t *face,
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bool retain_gids,
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const hb_set_t *all_gids_to_retain,
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hb_map_t *glyph_map, /* OUT */
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hb_map_t *reverse_glyph_map, /* OUT */
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unsigned int *num_glyphs /* OUT */)
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{
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if (!retain_gids)
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{
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+ hb_enumerate (hb_iter (all_gids_to_retain), (hb_codepoint_t) 0)
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| hb_sink (reverse_glyph_map)
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;
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*num_glyphs = reverse_glyph_map->get_population ();
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} else {
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+ hb_iter (all_gids_to_retain)
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| hb_map ([] (hb_codepoint_t _) {
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return hb_pair_t<hb_codepoint_t, hb_codepoint_t> (_, _);
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})
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| hb_sink (reverse_glyph_map)
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;
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unsigned max_glyph =
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+ hb_iter (all_gids_to_retain)
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| hb_reduce (hb_max, 0u)
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;
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*num_glyphs = max_glyph + 1;
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}
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+ reverse_glyph_map->iter ()
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| hb_map (&hb_pair_t<hb_codepoint_t, hb_codepoint_t>::reverse)
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| hb_sink (glyph_map)
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;
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}
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static void
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_nameid_closure (hb_face_t *face,
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hb_set_t *nameids)
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{
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#ifndef HB_NO_STYLE
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face->table.STAT->collect_name_ids (nameids);
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#endif
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#ifndef HB_NO_VAR
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face->table.fvar->collect_name_ids (nameids);
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#endif
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}
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/**
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* hb_subset_plan_create:
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* Computes a plan for subsetting the supplied face according
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* to a provided input. The plan describes
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* which tables and glyphs should be retained.
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*
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* Return value: New subset plan.
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*
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* Since: 1.7.5
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**/
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hb_subset_plan_t *
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hb_subset_plan_create (hb_face_t *face,
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hb_subset_input_t *input)
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{
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hb_subset_plan_t *plan;
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if (unlikely (!(plan = hb_object_create<hb_subset_plan_t> ())))
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return const_cast<hb_subset_plan_t *> (&Null (hb_subset_plan_t));
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plan->successful = true;
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plan->drop_hints = input->drop_hints;
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plan->desubroutinize = input->desubroutinize;
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plan->retain_gids = input->retain_gids;
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plan->name_legacy = input->name_legacy;
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plan->unicodes = hb_set_create ();
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plan->name_ids = hb_set_reference (input->name_ids);
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_nameid_closure (face, plan->name_ids);
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plan->name_languages = hb_set_reference (input->name_languages);
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plan->glyphs_requested = hb_set_reference (input->glyphs);
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plan->drop_tables = hb_set_reference (input->drop_tables);
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plan->source = hb_face_reference (face);
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plan->dest = hb_face_builder_create ();
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plan->_glyphset = hb_set_create ();
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plan->_glyphset_gsub = hb_set_create ();
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plan->codepoint_to_glyph = hb_map_create ();
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plan->glyph_map = hb_map_create ();
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plan->reverse_glyph_map = hb_map_create ();
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plan->gsub_lookups = hb_map_create ();
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plan->gpos_lookups = hb_map_create ();
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plan->gsub_features = hb_map_create ();
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plan->gpos_features = hb_map_create ();
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plan->layout_variation_indices = hb_set_create ();
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plan->layout_variation_idx_map = hb_map_create ();
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_populate_gids_to_retain (plan,
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|
input->unicodes,
|
||
|
|
input->glyphs,
|
||
|
|
!input->drop_tables->has (HB_OT_TAG_GSUB),
|
||
|
|
!input->drop_tables->has (HB_OT_TAG_GPOS),
|
||
|
|
!input->drop_tables->has (HB_OT_TAG_GDEF));
|
||
|
|
|
||
|
|
_create_old_gid_to_new_gid_map (face,
|
||
|
|
input->retain_gids,
|
||
|
|
plan->_glyphset,
|
||
|
|
plan->glyph_map,
|
||
|
|
plan->reverse_glyph_map,
|
||
|
|
&plan->_num_output_glyphs);
|
||
|
|
|
||
|
|
return plan;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* hb_subset_plan_destroy:
|
||
|
|
*
|
||
|
|
* Since: 1.7.5
|
||
|
|
**/
|
||
|
|
void
|
||
|
|
hb_subset_plan_destroy (hb_subset_plan_t *plan)
|
||
|
|
{
|
||
|
|
if (!hb_object_destroy (plan)) return;
|
||
|
|
|
||
|
|
hb_set_destroy (plan->unicodes);
|
||
|
|
hb_set_destroy (plan->name_ids);
|
||
|
|
hb_set_destroy (plan->name_languages);
|
||
|
|
hb_set_destroy (plan->glyphs_requested);
|
||
|
|
hb_set_destroy (plan->drop_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_set_destroy (plan->_glyphset);
|
||
|
|
hb_set_destroy (plan->_glyphset_gsub);
|
||
|
|
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_set_destroy (plan->layout_variation_indices);
|
||
|
|
hb_map_destroy (plan->layout_variation_idx_map);
|
||
|
|
|
||
|
|
|
||
|
|
free (plan);
|
||
|
|
}
|