HarfBuzz text shaping engine
http://harfbuzz.github.io/
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127 lines
3.7 KiB
127 lines
3.7 KiB
/* |
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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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void init (hb_face_t *face) |
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{ table = hb_sanitize_context_t ().reference_table<meta> (face); } |
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void fini () { 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.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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} /* namespace OT */ |
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#endif /* HB_OT_META_TABLE_HH */
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