1 /*
2 * Copyright © 2021 Behdad Esfahbod.
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
25 #include "hb.hh"
26
27 #ifndef HB_NO_OT_SHAPE
28
29 #include "hb-ot-shape-complex-syllabic.hh"
30
31
32 void
hb_syllabic_insert_dotted_circles(hb_font_t * font,hb_buffer_t * buffer,unsigned int broken_syllable_type,unsigned int dottedcircle_category,int repha_category)33 hb_syllabic_insert_dotted_circles (hb_font_t *font,
34 hb_buffer_t *buffer,
35 unsigned int broken_syllable_type,
36 unsigned int dottedcircle_category,
37 int repha_category)
38 {
39 if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE))
40 return;
41
42 /* Note: This loop is extra overhead, but should not be measurable.
43 * TODO Use a buffer scratch flag to remove the loop. */
44 bool has_broken_syllables = false;
45 unsigned int count = buffer->len;
46 hb_glyph_info_t *info = buffer->info;
47 for (unsigned int i = 0; i < count; i++)
48 if ((info[i].syllable() & 0x0F) == broken_syllable_type)
49 {
50 has_broken_syllables = true;
51 break;
52 }
53 if (likely (!has_broken_syllables))
54 return;
55
56
57 hb_codepoint_t dottedcircle_glyph;
58 if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph))
59 return;
60
61 hb_glyph_info_t dottedcircle = {0};
62 dottedcircle.codepoint = 0x25CCu;
63 dottedcircle.complex_var_u8_category() = dottedcircle_category;
64 dottedcircle.codepoint = dottedcircle_glyph;
65
66 buffer->clear_output ();
67
68 buffer->idx = 0;
69 unsigned int last_syllable = 0;
70 while (buffer->idx < buffer->len && buffer->successful)
71 {
72 unsigned int syllable = buffer->cur().syllable();
73 if (unlikely (last_syllable != syllable && (syllable & 0x0F) == broken_syllable_type))
74 {
75 last_syllable = syllable;
76
77 hb_glyph_info_t ginfo = dottedcircle;
78 ginfo.cluster = buffer->cur().cluster;
79 ginfo.mask = buffer->cur().mask;
80 ginfo.syllable() = buffer->cur().syllable();
81
82 /* Insert dottedcircle after possible Repha. */
83 if (repha_category != -1)
84 {
85 while (buffer->idx < buffer->len && buffer->successful &&
86 last_syllable == buffer->cur().syllable() &&
87 buffer->cur().complex_var_u8_category() == (unsigned) repha_category)
88 (void) buffer->next_glyph ();
89 }
90
91 (void) buffer->output_info (ginfo);
92 }
93 else
94 (void) buffer->next_glyph ();
95 }
96 buffer->swap_buffers ();
97 }
98
99
100 #endif
101