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[ankr] Implement table access

This commit is contained in:
Behdad Esfahbod 2018-10-10 23:07:03 -04:00
parent 7281cb3eeb
commit 947962a287
1 changed files with 16 additions and 0 deletions
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16
src/hb-aat-layout-ankr-table.hh
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@ -45,16 +45,32 @@ struct Anchor
return_trace (c->check_struct (this)); return_trace (c->check_struct (this));
} }
public:
FWORD xCoordinate; FWORD xCoordinate;
FWORD yCoordinate; FWORD yCoordinate;
public: public:
DEFINE_SIZE_STATIC (4); DEFINE_SIZE_STATIC (4);
}; };
typedef LArrayOf<Anchor> GlyphAnchors;
struct ankr struct ankr
{ {
static const hb_tag_t tableTag = HB_AAT_TAG_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 inline bool sanitize (hb_sanitize_context_t *c) const
{ {
TRACE_SANITIZE (this); TRACE_SANITIZE (this);