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-shaper-syllabic.hh"
30
31
32 bool
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 false;
42 if (likely (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE)))
43 {
44 if (buffer->messaging ())
45 (void) buffer->message (font, "skipped inserting dotted-circles because there is no broken syllables");
46 return false;
47 }
48
49 if (buffer->messaging () &&
50 !buffer->message (font, "start inserting dotted-circles"))
51 return false;
52
53 hb_codepoint_t dottedcircle_glyph;
54 if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph))
55 return false;
56
57 hb_glyph_info_t dottedcircle = {0};
58 dottedcircle.codepoint = 0x25CCu;
59 dottedcircle.ot_shaper_var_u8_category() = dottedcircle_category;
60 if (dottedcircle_position != -1)
61 dottedcircle.ot_shaper_var_u8_auxiliary() = dottedcircle_position;
62 dottedcircle.codepoint = dottedcircle_glyph;
63
64 buffer->clear_output ();
65
66 buffer->idx = 0;
67 unsigned int last_syllable = 0;
68 while (buffer->idx < buffer->len && buffer->successful)
69 {
70 unsigned int syllable = buffer->cur().syllable();
71 if (unlikely (last_syllable != syllable && (syllable & 0x0F) == broken_syllable_type))
72 {
73 last_syllable = syllable;
74
75 hb_glyph_info_t ginfo = dottedcircle;
76 ginfo.cluster = buffer->cur().cluster;
77 ginfo.mask = buffer->cur().mask;
78 ginfo.syllable() = buffer->cur().syllable();
79
80 /* Insert dottedcircle after possible Repha. */
81 if (repha_category != -1)
82 {
83 while (buffer->idx < buffer->len && buffer->successful &&
84 last_syllable == buffer->cur().syllable() &&
85 buffer->cur().ot_shaper_var_u8_category() == (unsigned) repha_category)
86 (void) buffer->next_glyph ();
87 }
88
89 (void) buffer->output_info (ginfo);
90 }
91 else
92 (void) buffer->next_glyph ();
93 }
94 buffer->sync ();
95
96 if (buffer->messaging ())
97 (void) buffer->message (font, "end inserting dotted-circles");
98
99 return true;
100 }
101
102 HB_INTERNAL bool
hb_syllabic_clear_var(const hb_ot_shape_plan_t * plan,hb_font_t * font,hb_buffer_t * buffer)103 hb_syllabic_clear_var (const hb_ot_shape_plan_t *plan,
104 hb_font_t *font,
105 hb_buffer_t *buffer)
106 {
107 HB_BUFFER_DEALLOCATE_VAR (buffer, syllable);
108 return false;
109 }
110
111
112 #endif
113