1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "vorg.h"
6
7 #include <vector>
8
9 // VORG - Vertical Origin Table
10 // http://www.microsoft.com/opentype/otspec/vorg.htm
11
12 #define DROP_THIS_TABLE \
13 do { delete file->vorg; file->vorg = 0; } while (0)
14
15 namespace ots {
16
ots_vorg_parse(OpenTypeFile * file,const uint8_t * data,size_t length)17 bool ots_vorg_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
18 Buffer table(data, length);
19 file->vorg = new OpenTypeVORG;
20 OpenTypeVORG * const vorg = file->vorg;
21
22 uint16_t num_recs;
23 if (!table.ReadU16(&vorg->major_version) ||
24 !table.ReadU16(&vorg->minor_version) ||
25 !table.ReadS16(&vorg->default_vert_origin_y) ||
26 !table.ReadU16(&num_recs)) {
27 return OTS_FAILURE();
28 }
29 if (vorg->major_version != 1) {
30 OTS_WARNING("bad major version: %u", vorg->major_version);
31 DROP_THIS_TABLE;
32 return true;
33 }
34 if (vorg->minor_version != 0) {
35 OTS_WARNING("bad minor version: %u", vorg->minor_version);
36 DROP_THIS_TABLE;
37 return true;
38 }
39
40 // num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf).
41 if (!num_recs) {
42 return true;
43 }
44
45 uint16_t last_glyph_index = 0;
46 vorg->metrics.reserve(num_recs);
47 for (unsigned i = 0; i < num_recs; ++i) {
48 OpenTypeVORGMetrics rec;
49
50 if (!table.ReadU16(&rec.glyph_index) ||
51 !table.ReadS16(&rec.vert_origin_y)) {
52 return OTS_FAILURE();
53 }
54 if ((i != 0) && (rec.glyph_index <= last_glyph_index)) {
55 OTS_WARNING("the table is not sorted");
56 DROP_THIS_TABLE;
57 return true;
58 }
59 last_glyph_index = rec.glyph_index;
60
61 vorg->metrics.push_back(rec);
62 }
63
64 return true;
65 }
66
ots_vorg_should_serialise(OpenTypeFile * file)67 bool ots_vorg_should_serialise(OpenTypeFile *file) {
68 if (!file->cff) return false; // this table is not for fonts with TT glyphs.
69 return file->vorg != NULL;
70 }
71
ots_vorg_serialise(OTSStream * out,OpenTypeFile * file)72 bool ots_vorg_serialise(OTSStream *out, OpenTypeFile *file) {
73 OpenTypeVORG * const vorg = file->vorg;
74
75 if (!out->WriteU16(vorg->major_version) ||
76 !out->WriteU16(vorg->minor_version) ||
77 !out->WriteS16(vorg->default_vert_origin_y) ||
78 !out->WriteU16(vorg->metrics.size())) {
79 return OTS_FAILURE();
80 }
81
82 for (unsigned i = 0; i < vorg->metrics.size(); ++i) {
83 const OpenTypeVORGMetrics& rec = vorg->metrics[i];
84 if (!out->WriteU16(rec.glyph_index) ||
85 !out->WriteS16(rec.vert_origin_y)) {
86 return OTS_FAILURE();
87 }
88 }
89
90 return true;
91 }
92
ots_vorg_free(OpenTypeFile * file)93 void ots_vorg_free(OpenTypeFile *file) {
94 delete file->vorg;
95 }
96
97 } // namespace ots
98