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
15namespace ots {
16
17bool 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
67bool 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
72bool 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
93void ots_vorg_free(OpenTypeFile *file) {
94  delete file->vorg;
95}
96
97}  // namespace ots
98