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// Copyright (c) 2009-2017 The OTS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "vorg.h"
#include <vector>
// VORG - Vertical Origin Table
// http://www.microsoft.com/typography/otspec/vorg.htm
namespace ots {
bool OpenTypeVORG::Parse(const uint8_t *data, size_t length) {
Buffer table(data, length);
uint16_t num_recs;
if (!table.ReadU16(&this->major_version) ||
!table.ReadU16(&this->minor_version) ||
!table.ReadS16(&this->default_vert_origin_y) ||
!table.ReadU16(&num_recs)) {
return Error("Failed to read header");
}
if (this->major_version != 1) {
return Drop("Unsupported majorVersion: %u", this->major_version);
}
if (this->minor_version != 0) {
return Drop("Unsupported minorVersion: %u", this->minor_version);
}
// num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf).
if (!num_recs) {
return true;
}
uint16_t last_glyph_index = 0;
this->metrics.reserve(num_recs);
for (unsigned i = 0; i < num_recs; ++i) {
OpenTypeVORGMetrics rec;
if (!table.ReadU16(&rec.glyph_index) ||
!table.ReadS16(&rec.vert_origin_y)) {
return Error("Failed to read record %d", i);
}
if ((i != 0) && (rec.glyph_index <= last_glyph_index)) {
return Drop("The table is not sorted");
}
last_glyph_index = rec.glyph_index;
this->metrics.push_back(rec);
}
return true;
}
bool OpenTypeVORG::Serialize(OTSStream *out) {
const uint16_t num_metrics = static_cast<uint16_t>(this->metrics.size());
if (num_metrics != this->metrics.size() ||
!out->WriteU16(this->major_version) ||
!out->WriteU16(this->minor_version) ||
!out->WriteS16(this->default_vert_origin_y) ||
!out->WriteU16(num_metrics)) {
return Error("Failed to write table header");
}
for (uint16_t i = 0; i < num_metrics; ++i) {
const OpenTypeVORGMetrics& rec = this->metrics[i];
if (!out->WriteU16(rec.glyph_index) ||
!out->WriteS16(rec.vert_origin_y)) {
return Error("Failed to write record %d", i);
}
}
return true;
}
bool OpenTypeVORG::ShouldSerialize() {
return Table::ShouldSerialize() &&
// this table is not for fonts with TT glyphs.
GetFont()->GetTable(OTS_TAG_CFF) != NULL;
}
} // namespace ots
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