1// SPDX-License-Identifier: MIT OR MPL-2.0 OR LGPL-2.1-or-later OR GPL-2.0-or-later
2// Copyright 2010, SIL International, All rights reserved.
3
4#include "graphite2/Segment.h"
5#include "inc/UtfCodec.h"
6#include "inc/Segment.h"
7
8using namespace graphite2;
9
10namespace
11{
12
13 gr_segment* makeAndInitialize(const Font *font, const Face *face, uint32 script, const Features* pFeats/*must not be NULL*/, gr_encform enc, const void* pStart, size_t nChars, int dir)
14 {
15 if (script == 0x20202020) script = 0;
16 else if ((script & 0x00FFFFFF) == 0x00202020) script = script & 0xFF000000;
17 else if ((script & 0x0000FFFF) == 0x00002020) script = script & 0xFFFF0000;
18 else if ((script & 0x000000FF) == 0x00000020) script = script & 0xFFFFFF00;
19 // if (!font) return NULL;
20 Segment* pRes=new Segment(nChars, face, script, dir);
21
22
23 if (!pRes->read_text(face, pFeats, enc, pStart, nChars) || !pRes->runGraphite())
24 {
25 delete pRes;
26 return NULL;
27 }
28 pRes->finalise(font, true);
29
30 return static_cast<gr_segment*>(pRes);
31 }
32
33 template <typename utf_iter>
34 inline size_t count_unicode_chars(utf_iter first, const utf_iter last, const void **error)
35 {
36 size_t n_chars = 0;
37 uint32 usv = 0;
38
39 if (last)
40 {
41 if (!first.validate(last))
42 {
43 if (error) *error = last - 1;
44 return 0;
45 }
46 for (;first != last; ++first, ++n_chars)
47 if ((usv = *first) == 0 || first.error()) break;
48 }
49 else
50 {
51 while ((usv = *first) != 0 && !first.error())
52 {
53 ++first;
54 ++n_chars;
55 }
56 }
57
58 if (error) *error = first.error() ? first : 0;
59 return n_chars;
60 }
61}
62
63
64extern "C" {
65
66size_t gr_count_unicode_characters(gr_encform enc, const void* buffer_begin, const void* buffer_end/*don't go on or past end, If NULL then ignored*/, const void** pError) //Also stops on nul. Any nul is not in the count
67{
68 assert(buffer_begin);
69
70 switch (enc)
71 {
72 case gr_utf8: return count_unicode_chars<utf8::const_iterator>(buffer_begin, buffer_end, pError); break;
73 case gr_utf16: return count_unicode_chars<utf16::const_iterator>(buffer_begin, buffer_end, pError); break;
74 case gr_utf32: return count_unicode_chars<utf32::const_iterator>(buffer_begin, buffer_end, pError); break;
75 default: return 0;
76 }
77}
78
79
80gr_segment* gr_make_seg(const gr_font *font, const gr_face *face, gr_uint32 script, const gr_feature_val* pFeats, gr_encform enc, const void* pStart, size_t nChars, int dir)
81{
82 if (!face) return nullptr;
83
84 const gr_feature_val * tmp_feats = 0;
85 if (pFeats == 0)
86 pFeats = tmp_feats = static_cast<const gr_feature_val*>(face->theSill().cloneFeatures(0));
87 gr_segment * seg = makeAndInitialize(font, face, script, pFeats, enc, pStart, nChars, dir);
88 delete static_cast<const FeatureVal*>(tmp_feats);
89
90 return seg;
91}
92
93
94void gr_seg_destroy(gr_segment* p)
95{
96 delete static_cast<Segment*>(p);
97}
98
99
100float gr_seg_advance_X(const gr_segment* pSeg/*not NULL*/)
101{
102 assert(pSeg);
103 return pSeg->advance().x;
104}
105
106
107float gr_seg_advance_Y(const gr_segment* pSeg/*not NULL*/)
108{
109 assert(pSeg);
110 return pSeg->advance().y;
111}
112
113
114unsigned int gr_seg_n_cinfo(const gr_segment* pSeg/*not NULL*/)
115{
116 assert(pSeg);
117 return static_cast<unsigned int>(pSeg->charInfoCount());
118}
119
120
121const gr_char_info* gr_seg_cinfo(const gr_segment* pSeg/*not NULL*/, unsigned int index/*must be <number_of_CharInfo*/)
122{
123 assert(pSeg);
124 return static_cast<const gr_char_info*>(pSeg->charinfo(index));
125}
126
127unsigned int gr_seg_n_slots(const gr_segment* pSeg/*not NULL*/)
128{
129 assert(pSeg);
130 return static_cast<unsigned int>(pSeg->slotCount());
131}
132
133const gr_slot* gr_seg_first_slot(gr_segment* pSeg/*not NULL*/)
134{
135 assert(pSeg);
136 return static_cast<const gr_slot*>(pSeg->first());
137}
138
139const gr_slot* gr_seg_last_slot(gr_segment* pSeg/*not NULL*/)
140{
141 assert(pSeg);
142 return static_cast<const gr_slot*>(pSeg->last());
143}
144
145float gr_seg_justify(gr_segment* pSeg/*not NULL*/, const gr_slot* pSlot/*not NULL*/, const gr_font *pFont, double width, enum gr_justFlags flags, const gr_slot *pFirst, const gr_slot *pLast)
146{
147 assert(pSeg);
148 assert(pSlot);
149 return pSeg->justify(const_cast<gr_slot *>(pSlot), pFont, float(width), justFlags(flags), const_cast<gr_slot *>(pFirst), const_cast<gr_slot *>(pLast));
150}
151
152} // extern "C"
153