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