1 | #ifndef OT_LAYOUT_GPOS_ANCHORMATRIX_HH |
2 | #define OT_LAYOUT_GPOS_ANCHORMATRIX_HH |
3 | |
4 | namespace OT { |
5 | namespace Layout { |
6 | namespace GPOS_impl { |
7 | |
8 | struct AnchorMatrix |
9 | { |
10 | HBUINT16 rows; /* Number of rows */ |
11 | UnsizedArrayOf<Offset16To<Anchor>> |
12 | matrixZ; /* Matrix of offsets to Anchor tables-- |
13 | * from beginning of AnchorMatrix table */ |
14 | public: |
15 | DEFINE_SIZE_ARRAY (2, matrixZ); |
16 | |
17 | bool sanitize (hb_sanitize_context_t *c, unsigned int cols) const |
18 | { |
19 | TRACE_SANITIZE (this); |
20 | if (!c->check_struct (this)) return_trace (false); |
21 | if (unlikely (hb_unsigned_mul_overflows (rows, cols))) return_trace (false); |
22 | unsigned int count = rows * cols; |
23 | if (!c->check_array (matrixZ.arrayZ, count)) return_trace (false); |
24 | |
25 | if (c->lazy_some_gpos) |
26 | return_trace (true); |
27 | |
28 | for (unsigned int i = 0; i < count; i++) |
29 | if (!matrixZ[i].sanitize (c, this)) return_trace (false); |
30 | return_trace (true); |
31 | } |
32 | |
33 | const Anchor& get_anchor (hb_ot_apply_context_t *c, |
34 | unsigned int row, unsigned int col, |
35 | unsigned int cols, bool *found) const |
36 | { |
37 | *found = false; |
38 | if (unlikely (row >= rows || col >= cols)) return Null (Anchor); |
39 | auto &offset = matrixZ[row * cols + col]; |
40 | if (unlikely (!offset.sanitize (&c->sanitizer, this))) return Null (Anchor); |
41 | *found = !offset.is_null (); |
42 | return this+offset; |
43 | } |
44 | |
45 | template <typename Iterator, |
46 | hb_requires (hb_is_iterator (Iterator))> |
47 | void collect_variation_indices (hb_collect_variation_indices_context_t *c, |
48 | Iterator index_iter) const |
49 | { |
50 | for (unsigned i : index_iter) |
51 | (this+matrixZ[i]).collect_variation_indices (c); |
52 | } |
53 | |
54 | template <typename Iterator, |
55 | hb_requires (hb_is_iterator (Iterator))> |
56 | bool subset (hb_subset_context_t *c, |
57 | unsigned num_rows, |
58 | Iterator index_iter) const |
59 | { |
60 | TRACE_SUBSET (this); |
61 | |
62 | auto *out = c->serializer->start_embed (this); |
63 | |
64 | if (!index_iter) return_trace (false); |
65 | if (unlikely (!c->serializer->extend_min (out))) return_trace (false); |
66 | |
67 | out->rows = num_rows; |
68 | for (const unsigned i : index_iter) |
69 | { |
70 | auto *offset = c->serializer->embed (matrixZ[i]); |
71 | if (!offset) return_trace (false); |
72 | offset->serialize_subset (c, matrixZ[i], this); |
73 | } |
74 | |
75 | return_trace (true); |
76 | } |
77 | }; |
78 | |
79 | |
80 | } |
81 | } |
82 | } |
83 | |
84 | #endif /* OT_LAYOUT_GPOS_ANCHORMATRIX_HH */ |
85 | |