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comparison mupdf-source/thirdparty/harfbuzz/src/hb-kern.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 /*
2 * Copyright © 2017 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27 #ifndef HB_KERN_HH
28 #define HB_KERN_HH
29
30 #include "hb-open-type.hh"
31 #include "hb-aat-layout-common.hh"
32 #include "hb-ot-layout-gpos-table.hh"
33
34
35 namespace OT {
36
37
38 template <typename Driver>
39 struct hb_kern_machine_t
40 {
41 hb_kern_machine_t (const Driver &driver_,
42 bool crossStream_ = false) :
43 driver (driver_),
44 crossStream (crossStream_) {}
45
46 HB_NO_SANITIZE_SIGNED_INTEGER_OVERFLOW
47 void kern (hb_font_t *font,
48 hb_buffer_t *buffer,
49 hb_mask_t kern_mask,
50 bool scale = true) const
51 {
52 if (!buffer->message (font, "start kern"))
53 return;
54
55 buffer->unsafe_to_concat ();
56 OT::hb_ot_apply_context_t c (1, font, buffer);
57 c.set_lookup_mask (kern_mask);
58 c.set_lookup_props (OT::LookupFlag::IgnoreMarks);
59 auto &skippy_iter = c.iter_input;
60
61 bool horizontal = HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction);
62 unsigned int count = buffer->len;
63 hb_glyph_info_t *info = buffer->info;
64 hb_glyph_position_t *pos = buffer->pos;
65 for (unsigned int idx = 0; idx < count;)
66 {
67 if (!(info[idx].mask & kern_mask))
68 {
69 idx++;
70 continue;
71 }
72
73 skippy_iter.reset (idx, 1);
74 unsigned unsafe_to;
75 if (!skippy_iter.next (&unsafe_to))
76 {
77 idx++;
78 continue;
79 }
80
81 unsigned int i = idx;
82 unsigned int j = skippy_iter.idx;
83
84 hb_position_t kern = driver.get_kerning (info[i].codepoint,
85 info[j].codepoint);
86
87
88 if (likely (!kern))
89 goto skip;
90
91 if (horizontal)
92 {
93 if (scale)
94 kern = font->em_scale_x (kern);
95 if (crossStream)
96 {
97 pos[j].y_offset = kern;
98 buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
99 }
100 else
101 {
102 hb_position_t kern1 = kern >> 1;
103 hb_position_t kern2 = kern - kern1;
104 pos[i].x_advance += kern1;
105 pos[j].x_advance += kern2;
106 pos[j].x_offset += kern2;
107 }
108 }
109 else
110 {
111 if (scale)
112 kern = font->em_scale_y (kern);
113 if (crossStream)
114 {
115 pos[j].x_offset = kern;
116 buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
117 }
118 else
119 {
120 hb_position_t kern1 = kern >> 1;
121 hb_position_t kern2 = kern - kern1;
122 pos[i].y_advance += kern1;
123 pos[j].y_advance += kern2;
124 pos[j].y_offset += kern2;
125 }
126 }
127
128 buffer->unsafe_to_break (i, j + 1);
129
130 skip:
131 idx = skippy_iter.idx;
132 }
133
134 (void) buffer->message (font, "end kern");
135 }
136
137 const Driver &driver;
138 bool crossStream;
139 };
140
141
142 } /* namespace OT */
143
144
145 #endif /* HB_KERN_HH */