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