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#ifndef OT_LAYOUT_GPOS_ANCHORMATRIX_HH
#define OT_LAYOUT_GPOS_ANCHORMATRIX_HH
namespace OT {
namespace Layout {
namespace GPOS_impl {
struct AnchorMatrix
{
HBUINT16 rows; /* Number of rows */
UnsizedArrayOf<Offset16To<Anchor, AnchorMatrix>>
matrixZ; /* Matrix of offsets to Anchor tables--
* from beginning of AnchorMatrix table */
public:
DEFINE_SIZE_ARRAY (2, matrixZ);
bool sanitize (hb_sanitize_context_t *c, unsigned int cols) const
{
TRACE_SANITIZE (this);
if (!c->check_struct (this)) return_trace (false);
hb_barrier ();
if (unlikely (hb_unsigned_mul_overflows (rows, cols))) return_trace (false);
unsigned int count = rows * cols;
if (!c->check_array (matrixZ.arrayZ, count)) return_trace (false);
if (c->lazy_some_gpos)
return_trace (true);
hb_barrier ();
for (unsigned int i = 0; i < count; i++)
if (!matrixZ[i].sanitize (c, this)) return_trace (false);
return_trace (true);
}
const Anchor& get_anchor (hb_ot_apply_context_t *c,
unsigned int row, unsigned int col,
unsigned int cols, bool *found) const
{
*found = false;
if (unlikely (row >= rows || col >= cols)) return Null (Anchor);
auto &offset = matrixZ[row * cols + col];
if (unlikely (!offset.sanitize (&c->sanitizer, this))) return Null (Anchor);
hb_barrier ();
*found = !offset.is_null ();
return this+offset;
}
template <typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
void collect_variation_indices (hb_collect_variation_indices_context_t *c,
Iterator index_iter) const
{
for (unsigned i : index_iter)
(this+matrixZ[i]).collect_variation_indices (c);
}
template <typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
bool subset (hb_subset_context_t *c,
unsigned num_rows,
Iterator index_iter) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (this);
if (!index_iter) return_trace (false);
if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
out->rows = num_rows;
for (const unsigned i : index_iter)
{
auto *offset = c->serializer->embed (matrixZ[i]);
if (!offset) return_trace (false);
offset->serialize_subset (c, matrixZ[i], this);
}
return_trace (true);
}
};
}
}
}
#endif /* OT_LAYOUT_GPOS_ANCHORMATRIX_HH */