1// Copyright (c) 2011 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 "vhea.h"
6
7#include "gsub.h"
8#include "head.h"
9#include "maxp.h"
10
11// vhea - Vertical Header Table
12// http://www.microsoft.com/opentype/otspec/vhea.htm
13
14namespace ots {
15
16bool ots_vhea_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
17  Buffer table(data, length);
18  OpenTypeVHEA *vhea = new OpenTypeVHEA;
19  file->vhea = vhea;
20
21  if (!table.ReadU32(&vhea->header.version)) {
22    return OTS_FAILURE();
23  }
24  if (vhea->header.version != 0x00010000 &&
25      vhea->header.version != 0x00011000) {
26    return OTS_FAILURE();
27  }
28
29  if (!ParseMetricsHeader(file, &table, &vhea->header)) {
30    return OTS_FAILURE();
31  }
32
33  return true;
34}
35
36bool ots_vhea_should_serialise(OpenTypeFile *file) {
37  // vhea should'nt serialise when vmtx doesn't exist.
38  // Firefox developer pointed out that vhea/vmtx should serialise iff GSUB is
39  // preserved. See http://crbug.com/77386
40  return file->vhea != NULL && file->vmtx != NULL &&
41      ots_gsub_should_serialise(file);
42}
43
44bool ots_vhea_serialise(OTSStream *out, OpenTypeFile *file) {
45  if (!SerialiseMetricsHeader(out, &file->vhea->header)) {
46    return OTS_FAILURE();
47  }
48  return true;
49}
50
51void ots_vhea_free(OpenTypeFile *file) {
52  delete file->vhea;
53}
54
55}  // namespace ots
56
57