1#ifndef OT_GLYF_GLYF_HELPERS_HH
2#define OT_GLYF_GLYF_HELPERS_HH
3
4
5#include "../../hb-open-type.hh"
6#include "../../hb-subset-plan.hh"
7
8#include "loca.hh"
9
10
11namespace OT {
12namespace glyf_impl {
13
14
15template<typename IteratorIn, typename TypeOut,
16 hb_requires (hb_is_source_of (IteratorIn, unsigned int))>
17static void
18_write_loca (IteratorIn&& it,
19 const hb_sorted_vector_t<hb_codepoint_pair_t> new_to_old_gid_list,
20 bool short_offsets,
21 TypeOut *dest,
22 unsigned num_offsets)
23{
24 unsigned right_shift = short_offsets ? 1 : 0;
25 unsigned offset = 0;
26 TypeOut value;
27 value = 0;
28 *dest++ = value;
29 hb_codepoint_t last = 0;
30 for (auto _ : new_to_old_gid_list)
31 {
32 hb_codepoint_t gid = _.first;
33 for (; last < gid; last++)
34 {
35 DEBUG_MSG (SUBSET, nullptr, "loca entry empty offset %u", offset);
36 *dest++ = value;
37 }
38
39 unsigned padded_size = *it++;
40 offset += padded_size;
41 DEBUG_MSG (SUBSET, nullptr, "loca entry gid %u offset %u padded-size %u", gid, offset, padded_size);
42 value = offset >> right_shift;
43 *dest++ = value;
44
45 last++; // Skip over gid
46 }
47 unsigned num_glyphs = num_offsets - 1;
48 for (; last < num_glyphs; last++)
49 {
50 DEBUG_MSG (SUBSET, nullptr, "loca entry empty offset %u", offset);
51 *dest++ = value;
52 }
53}
54
55static bool
56_add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca)
57{
58 hb_blob_t *head_blob = hb_sanitize_context_t ().reference_table<head> (plan->source);
59 hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob);
60 hb_blob_destroy (head_blob);
61
62 if (unlikely (!head_prime_blob))
63 return false;
64
65 head *head_prime = (head *) hb_blob_get_data_writable (head_prime_blob, nullptr);
66 head_prime->indexToLocFormat = use_short_loca ? 0 : 1;
67 if (plan->normalized_coords)
68 {
69 head_prime->xMin = plan->head_maxp_info.xMin;
70 head_prime->xMax = plan->head_maxp_info.xMax;
71 head_prime->yMin = plan->head_maxp_info.yMin;
72 head_prime->yMax = plan->head_maxp_info.yMax;
73
74 unsigned orig_flag = head_prime->flags;
75 if (plan->head_maxp_info.allXMinIsLsb)
76 orig_flag |= 1 << 1;
77 else
78 orig_flag &= ~(1 << 1);
79 head_prime->flags = orig_flag;
80 }
81 bool success = plan->add_table (HB_OT_TAG_head, head_prime_blob);
82
83 hb_blob_destroy (head_prime_blob);
84 return success;
85}
86
87template<typename Iterator,
88 hb_requires (hb_is_source_of (Iterator, unsigned int))>
89static bool
90_add_loca_and_head (hb_subset_context_t *c,
91 Iterator padded_offsets,
92 bool use_short_loca)
93{
94 unsigned num_offsets = c->plan->num_output_glyphs () + 1;
95 unsigned entry_size = use_short_loca ? 2 : 4;
96
97 char *loca_prime_data = (char *) hb_malloc (entry_size * num_offsets);
98
99 if (unlikely (!loca_prime_data)) return false;
100
101 DEBUG_MSG (SUBSET, nullptr, "loca entry_size %u num_offsets %u size %u",
102 entry_size, num_offsets, entry_size * num_offsets);
103
104 if (use_short_loca)
105 _write_loca (padded_offsets, c->plan->new_to_old_gid_list, true, (HBUINT16 *) loca_prime_data, num_offsets);
106 else
107 _write_loca (padded_offsets, c->plan->new_to_old_gid_list, false, (HBUINT32 *) loca_prime_data, num_offsets);
108
109 hb_blob_t *loca_blob = hb_blob_create (loca_prime_data,
110 entry_size * num_offsets,
111 HB_MEMORY_MODE_WRITABLE,
112 loca_prime_data,
113 hb_free);
114
115 bool result = c->plan->add_table (HB_OT_TAG_loca, loca_blob)
116 && _add_head_and_set_loca_version (c->plan, use_short_loca);
117
118 hb_blob_destroy (loca_blob);
119 return result;
120}
121
122
123} /* namespace glyf_impl */
124} /* namespace OT */
125
126
127#endif /* OT_GLYF_GLYF_HELPERS_HH */
128