/* * Copyright © 2019 Ebrahim Byagowi * * 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. */ #ifndef HB_OT_META_TABLE_HH #define HB_OT_META_TABLE_HH #include "hb-open-type.hh" /* * meta -- Metadata Table * https://docs.microsoft.com/en-us/typography/opentype/spec/meta * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6meta.html */ #define HB_OT_TAG_meta HB_TAG ('m','e','t','a') namespace OT { struct DataMap { int cmp (hb_tag_t a) const { return tag.cmp (a); } hb_tag_t get_tag () const { return tag; } hb_blob_t *reference_entry (hb_blob_t *meta_blob) const { return hb_blob_create_sub_blob (meta_blob, dataZ, dataLength); } bool sanitize (hb_sanitize_context_t *c, const void *base) const { TRACE_SANITIZE (this); return_trace (likely (c->check_struct (this) && dataZ.sanitize (c, base, dataLength))); } protected: Tag tag; /* A tag indicating the type of metadata. */ NNOffset32To<UnsizedArrayOf<HBUINT8>> dataZ; /* Offset in bytes from the beginning of the * metadata table to the data for this tag. */ HBUINT32 dataLength; /* Length of the data. The data is not required to * be padded to any byte boundary. */ public: DEFINE_SIZE_STATIC (12); }; struct meta { static constexpr hb_tag_t tableTag = HB_OT_TAG_meta; struct accelerator_t { accelerator_t (hb_face_t *face) { table = hb_sanitize_context_t ().reference_table<meta> (face); } ~accelerator_t () { table.destroy (); } hb_blob_t *reference_entry (hb_tag_t tag) const { return table->dataMaps.lsearch (tag).reference_entry (table.get_blob ()); } unsigned int get_entries (unsigned int start_offset, unsigned int *count, hb_ot_meta_tag_t *entries) const { if (count) { + table->dataMaps.sub_array (start_offset, count) | hb_map (&DataMap::get_tag) | hb_map ([](hb_tag_t tag) { return (hb_ot_meta_tag_t) tag; }) | hb_sink (hb_array (entries, *count)) ; } return table->dataMaps.len; } private: hb_blob_ptr_t<meta> table; }; bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (likely (c->check_struct (this) && version == 1 && dataMaps.sanitize (c, this))); } protected: HBUINT32 version; /* Version number of the metadata table — set to 1. */ HBUINT32 flags; /* Flags — currently unused; set to 0. */ HBUINT32 dataOffset; /* Per Apple specification: * Offset from the beginning of the table to the data. * Per OT specification: * Reserved. Not used; should be set to 0. */ Array32Of<DataMap> dataMaps;/* Array of data map records. */ public: DEFINE_SIZE_ARRAY (16, dataMaps); }; struct meta_accelerator_t : meta::accelerator_t { meta_accelerator_t (hb_face_t *face) : meta::accelerator_t (face) {} }; } /* namespace OT */ #endif /* HB_OT_META_TABLE_HH */