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