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comparison mupdf-source/thirdparty/harfbuzz/src/OT/glyf/glyf-helpers.hh @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
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
11 namespace OT {
12 namespace glyf_impl {
13
14
15 template<typename IteratorIn, typename IteratorOut,
16 hb_requires (hb_is_source_of (IteratorIn, unsigned int)),
17 hb_requires (hb_is_sink_of (IteratorOut, unsigned))>
18 static void
19 _write_loca (IteratorIn&& it, bool short_offsets, IteratorOut&& dest)
20 {
21 unsigned right_shift = short_offsets ? 1 : 0;
22 unsigned int offset = 0;
23 dest << 0;
24 + it
25 | hb_map ([=, &offset] (unsigned int padded_size)
26 {
27 offset += padded_size;
28 DEBUG_MSG (SUBSET, nullptr, "loca entry offset %d", offset);
29 return offset >> right_shift;
30 })
31 | hb_sink (dest)
32 ;
33 }
34
35 static bool
36 _add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca)
37 {
38 hb_blob_t *head_blob = hb_sanitize_context_t ().reference_table<head> (plan->source);
39 hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob);
40 hb_blob_destroy (head_blob);
41
42 if (unlikely (!head_prime_blob))
43 return false;
44
45 head *head_prime = (head *) hb_blob_get_data_writable (head_prime_blob, nullptr);
46 head_prime->indexToLocFormat = use_short_loca ? 0 : 1;
47 bool success = plan->add_table (HB_OT_TAG_head, head_prime_blob);
48
49 hb_blob_destroy (head_prime_blob);
50 return success;
51 }
52
53 template<typename Iterator,
54 hb_requires (hb_is_source_of (Iterator, unsigned int))>
55 static bool
56 _add_loca_and_head (hb_subset_plan_t * plan, Iterator padded_offsets, bool use_short_loca)
57 {
58 unsigned num_offsets = padded_offsets.len () + 1;
59 unsigned entry_size = use_short_loca ? 2 : 4;
60 char *loca_prime_data = (char *) hb_calloc (entry_size, num_offsets);
61
62 if (unlikely (!loca_prime_data)) return false;
63
64 DEBUG_MSG (SUBSET, nullptr, "loca entry_size %d num_offsets %d size %d",
65 entry_size, num_offsets, entry_size * num_offsets);
66
67 if (use_short_loca)
68 _write_loca (padded_offsets, true, hb_array ((HBUINT16 *) loca_prime_data, num_offsets));
69 else
70 _write_loca (padded_offsets, false, hb_array ((HBUINT32 *) loca_prime_data, num_offsets));
71
72 hb_blob_t *loca_blob = hb_blob_create (loca_prime_data,
73 entry_size * num_offsets,
74 HB_MEMORY_MODE_WRITABLE,
75 loca_prime_data,
76 hb_free);
77
78 bool result = plan->add_table (HB_OT_TAG_loca, loca_blob)
79 && _add_head_and_set_loca_version (plan, use_short_loca);
80
81 hb_blob_destroy (loca_blob);
82 return result;
83 }
84
85
86 } /* namespace glyf_impl */
87 } /* namespace OT */
88
89
90 #endif /* OT_GLYF_GLYF_HELPERS_HH */