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,int dottedcircle_position)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 int dottedcircle_position)
39 {
40 if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE))
41 return;
42
43 /* Note: This loop is extra overhead, but should not be measurable.
44 * TODO Use a buffer scratch flag to remove the loop. */
45 bool has_broken_syllables = false;
46 unsigned int count = buffer->len;
47 hb_glyph_info_t *info = buffer->info;
48 for (unsigned int i = 0; i < count; i++)
49 if ((info[i].syllable() & 0x0F) == broken_syllable_type)
50 {
51 has_broken_syllables = true;
52 break;
53 }
54 if (likely (!has_broken_syllables))
55 return;
56
57
58 hb_codepoint_t dottedcircle_glyph;
59 if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph))
60 return;
61
62 hb_glyph_info_t dottedcircle = {0};
63 dottedcircle.codepoint = 0x25CCu;
64 dottedcircle.complex_var_u8_category() = dottedcircle_category;
65 if (dottedcircle_position != -1)
66 dottedcircle.complex_var_u8_auxiliary() = dottedcircle_position;
67 dottedcircle.codepoint = dottedcircle_glyph;
68
69 buffer->clear_output ();
70
71 buffer->idx = 0;
72 unsigned int last_syllable = 0;
73 while (buffer->idx < buffer->len && buffer->successful)
74 {
75 unsigned int syllable = buffer->cur().syllable();
76 if (unlikely (last_syllable != syllable && (syllable & 0x0F) == broken_syllable_type))
77 {
78 last_syllable = syllable;
79
80 hb_glyph_info_t ginfo = dottedcircle;
81 ginfo.cluster = buffer->cur().cluster;
82 ginfo.mask = buffer->cur().mask;
83 ginfo.syllable() = buffer->cur().syllable();
84
85 /* Insert dottedcircle after possible Repha. */
86 if (repha_category != -1)
87 {
88 while (buffer->idx < buffer->len && buffer->successful &&
89 last_syllable == buffer->cur().syllable() &&
90 buffer->cur().complex_var_u8_category() == (unsigned) repha_category)
91 (void) buffer->next_glyph ();
92 }
93
94 (void) buffer->output_info (ginfo);
95 }
96 else
97 (void) buffer->next_glyph ();
98 }
99 buffer->sync ();
100 }
101
102
103 #endif
104