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