| /* |
| * 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 */ |