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+/*
+ * Copyright © 2022 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
+ */
+
+#ifndef HB_SUBSET_ACCELERATOR_HH
+#define HB_SUBSET_ACCELERATOR_HH
+
+
+#include "hb.hh"
+
+#include "hb-map.hh"
+#include "hb-multimap.hh"
+#include "hb-set.hh"
+
+extern HB_INTERNAL hb_user_data_key_t _hb_subset_accelerator_user_data_key;
+
+namespace CFF {
+struct cff_subset_accelerator_t;
+}
+
+namespace OT {
+struct SubtableUnicodesCache;
+struct cff1_subset_accelerator_t;
+struct cff2_subset_accelerator_t;
+}
+
+struct hb_subset_accelerator_t
+{
+ static hb_user_data_key_t* user_data_key()
+ {
+ return &_hb_subset_accelerator_user_data_key;
+ }
+
+ static hb_subset_accelerator_t* create(hb_face_t *source,
+ const hb_map_t& unicode_to_gid_,
+ const hb_set_t& unicodes_,
+ bool has_seac_) {
+ hb_subset_accelerator_t* accel =
+ (hb_subset_accelerator_t*) hb_calloc (1, sizeof(hb_subset_accelerator_t));
+
+ if (unlikely (!accel)) return accel;
+
+ new (accel) hb_subset_accelerator_t (source,
+ unicode_to_gid_,
+ unicodes_,
+ has_seac_);
+
+ return accel;
+ }
+
+ static void destroy (void* p)
+ {
+ if (!p) return;
+
+ hb_subset_accelerator_t *accel = (hb_subset_accelerator_t *) p;
+
+ accel->~hb_subset_accelerator_t ();
+
+ hb_free (accel);
+ }
+
+ hb_subset_accelerator_t (hb_face_t *source,
+ const hb_map_t& unicode_to_gid_,
+ const hb_set_t& unicodes_,
+ bool has_seac_) :
+ unicode_to_gid(unicode_to_gid_),
+ unicodes(unicodes_),
+ cmap_cache(nullptr),
+ destroy_cmap_cache(nullptr),
+ has_seac(has_seac_),
+ source(hb_face_reference (source))
+ {
+ gid_to_unicodes.alloc (unicode_to_gid.get_population ());
+ for (const auto &_ : unicode_to_gid)
+ {
+ auto unicode = _.first;
+ auto gid = _.second;
+ gid_to_unicodes.add (gid, unicode);
+ }
+ }
+
+ HB_INTERNAL ~hb_subset_accelerator_t ();
+
+ // Generic
+
+ mutable hb_mutex_t sanitized_table_cache_lock;
+ mutable hb_hashmap_t<hb_tag_t, hb::unique_ptr<hb_blob_t>> sanitized_table_cache;
+
+ hb_map_t unicode_to_gid;
+ hb_multimap_t gid_to_unicodes;
+ hb_set_t unicodes;
+
+ // cmap
+ const OT::SubtableUnicodesCache* cmap_cache;
+ hb_destroy_func_t destroy_cmap_cache;
+
+ // CFF
+ bool has_seac;
+
+ // TODO(garretrieger): cumulative glyf checksum map
+
+ bool in_error () const
+ {
+ return unicode_to_gid.in_error () ||
+ gid_to_unicodes.in_error () ||
+ unicodes.in_error () ||
+ sanitized_table_cache.in_error ();
+ }
+
+ hb_face_t *source;
+#ifndef HB_NO_SUBSET_CFF
+ // These have to be immediately after source:
+ mutable hb_face_lazy_loader_t<OT::cff1_subset_accelerator_t, 1> cff1_accel;
+ mutable hb_face_lazy_loader_t<OT::cff2_subset_accelerator_t, 2> cff2_accel;
+#endif
+};
+
+
+#endif /* HB_SUBSET_ACCELERATOR_HH */