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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-map.hh"
+#include "hb-set.hh"
+
+#include "hb-ot-cmap-table.hh"
+#include "hb-ot-glyf-table.hh"
+#include "hb-ot-cff1-table.hh"
+#include "hb-ot-var-fvar-table.hh"
+#include "hb-ot-stat-table.hh"
+
+#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);
+ }
+}
+#endif
+
+#ifndef HB_NO_SUBSET_LAYOUT
+static inline void
+_gsub_closure (hb_face_t *face, hb_set_t *gids_to_retain)
+{
+ hb_set_t lookup_indices;
+ hb_ot_layout_collect_lookups (face,
+ HB_OT_TAG_GSUB,
+ nullptr,
+ nullptr,
+ nullptr,
+ &lookup_indices);
+ hb_ot_layout_lookups_substitute_closure (face,
+ &lookup_indices,
+ gids_to_retain);
+}
+#endif
+
+static inline void
+_cmap_closure (hb_face_t *face,
+ const hb_set_t *unicodes,
+ hb_set_t *glyphset)
+{
+ OT::cmap::accelerator_t cmap;
+ cmap.init (face);
+ cmap.table->closure_glyphs (unicodes, glyphset);
+ cmap.fini ();
+}
+
+static inline void
+_remove_invalid_gids (hb_set_t *glyphs,
+ unsigned int num_glyphs)
+{
+ hb_codepoint_t gid = HB_SET_VALUE_INVALID;
+ while (glyphs->next (&gid))
+ {
+ if (gid >= num_glyphs)
+ glyphs->del (gid);
+ }
+}
+
+static void
+_populate_gids_to_retain (hb_subset_plan_t* plan,
+ const hb_set_t *unicodes,
+ const hb_set_t *input_glyphs_to_retain,
+ bool close_over_gsub)
+{
+ OT::cmap::accelerator_t cmap;
+ OT::glyf::accelerator_t glyf;
+ OT::cff1::accelerator_t cff;
+ cmap.init (plan->source);
+ glyf.init (plan->source);
+ cff.init (plan->source);
+
+ plan->_glyphset_gsub->add (0); // Not-def
+ hb_set_union (plan->_glyphset_gsub, input_glyphs_to_retain);
+
+ hb_codepoint_t cp = HB_SET_VALUE_INVALID;
+ while (unicodes->next (&cp))
+ {
+ hb_codepoint_t gid;
+ if (!cmap.get_nominal_glyph (cp, &gid))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "Drop U+%04X; no gid", cp);
+ continue;
+ }
+ plan->unicodes->add (cp);
+ plan->codepoint_to_glyph->set (cp, gid);
+ plan->_glyphset_gsub->add (gid);
+ }
+
+ _cmap_closure (plan->source, plan->unicodes, plan->_glyphset_gsub);
+
+#ifndef HB_NO_SUBSET_LAYOUT
+ if (close_over_gsub)
+ // Add all glyphs needed for GSUB substitutions.
+ _gsub_closure (plan->source, plan->_glyphset_gsub);
+#endif
+ _remove_invalid_gids (plan->_glyphset_gsub, plan->source->get_num_glyphs ());
+
+ // Populate a full set of glyphs to retain by adding all referenced
+ // composite glyphs.
+ hb_codepoint_t gid = HB_SET_VALUE_INVALID;
+ while (plan->_glyphset_gsub->next (&gid))
+ {
+ glyf.add_gid_and_children (gid, plan->_glyphset);
+#ifndef HB_NO_SUBSET_CFF
+ if (cff.is_valid ())
+ _add_cff_seac_components (cff, gid, plan->_glyphset);
+#endif
+ }
+
+ _remove_invalid_gids (plan->_glyphset, plan->source->get_num_glyphs ());
+
+ cff.fini ();
+ glyf.fini ();
+ cmap.fini ();
+}
+
+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 */)
+{
+ 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)
+ ;
+
+ unsigned max_glyph =
+ + hb_iter (all_gids_to_retain)
+ | hb_reduce (hb_max, 0u)
+ ;
+ *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_STAT
+ face->table.STAT->collect_name_ids (nameids);
+#endif
+#ifndef HB_NO_VAR
+ face->table.fvar->collect_name_ids (nameids);
+#endif
+}
+
+/**
+ * hb_subset_plan_create:
+ * 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: New subset plan.
+ *
+ * Since: 1.7.5
+ **/
+hb_subset_plan_t *
+hb_subset_plan_create (hb_face_t *face,
+ hb_subset_input_t *input)
+{
+ hb_subset_plan_t *plan = hb_object_create<hb_subset_plan_t> ();
+
+ plan->drop_hints = input->drop_hints;
+ plan->desubroutinize = input->desubroutinize;
+ plan->retain_gids = input->retain_gids;
+ plan->unicodes = hb_set_create ();
+ plan->name_ids = hb_set_reference (input->name_ids);
+ _nameid_closure (face, plan->name_ids);
+ plan->drop_tables = hb_set_reference (input->drop_tables);
+ plan->source = hb_face_reference (face);
+ plan->dest = hb_face_builder_create ();
+
+ plan->_glyphset = hb_set_create ();
+ plan->_glyphset_gsub = hb_set_create ();
+ plan->codepoint_to_glyph = hb_map_create ();
+ plan->glyph_map = hb_map_create ();
+ plan->reverse_glyph_map = hb_map_create ();
+
+ _populate_gids_to_retain (plan,
+ input->unicodes,
+ input->glyphs,
+ !input->drop_tables->has (HB_OT_TAG_GSUB));
+
+ _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->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);
+
+ free (plan);
+}
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