128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
/*
|
|
* 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
|
|
{
|
|
void init (hb_face_t *face)
|
|
{ table = hb_sanitize_context_t ().reference_table<meta> (face); }
|
|
void fini () { 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 {};
|
|
|
|
} /* namespace OT */
|
|
|
|
|
|
#endif /* HB_OT_META_TABLE_HH */
|