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/*
* Copyright © 2018 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_AAT_LAYOUT_ANKR_TABLE_HH
#define HB_AAT_LAYOUT_ANKR_TABLE_HH
#include "hb-aat-layout-common.hh"
/*
* ankr -- Anchor Point
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ankr.html
*/
#define HB_AAT_TAG_ankr HB_TAG('a','n','k','r')
namespace AAT {
struct Anchor
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
public:
FWORD xCoordinate;
FWORD yCoordinate;
public:
DEFINE_SIZE_STATIC (4);
};
typedef LArrayOf<Anchor> GlyphAnchors;
struct ankr
{
static const hb_tag_t tableTag = HB_AAT_TAG_ankr;
inline const Anchor &get_anchor (hb_codepoint_t glyph_id,
unsigned int i,
unsigned int num_glyphs,
const char *end) const
{
unsigned int offset = (this+lookupTable).get_value_or_null (glyph_id, num_glyphs);
const GlyphAnchors &anchors = StructAtOffset<GlyphAnchors> (&(this+anchorData), offset);
/* TODO Use sanitizer; to avoid overflows and more. */
if (unlikely ((const char *) &anchors + anchors.get_size () > end))
return Null(Anchor);
return anchors[i];
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
version == 0 &&
lookupTable.sanitize (c, this)));
}
protected:
HBUINT16 version; /* Version number (set to zero) */
HBUINT16 flags; /* Flags (currently unused; set to zero) */
LOffsetTo<Lookup<Offset<HBUINT16, false> > >
lookupTable; /* Offset to the table's lookup table */
LOffsetTo<HBUINT8>
anchorData; /* Offset to the glyph data table */
public:
DEFINE_SIZE_STATIC (12);
};
} /* namespace AAT */
#endif /* HB_AAT_LAYOUT_ANKR_TABLE_HH */
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