michael@0: // Copyright (c) 2011 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "vhea.h"
michael@0: 
michael@0: #include "gsub.h"
michael@0: #include "head.h"
michael@0: #include "maxp.h"
michael@0: 
michael@0: // vhea - Vertical Header Table
michael@0: // http://www.microsoft.com/typography/otspec/vhea.htm
michael@0: 
michael@0: #define TABLE_NAME "vhea"
michael@0: 
michael@0: namespace ots {
michael@0: 
michael@0: bool ots_vhea_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
michael@0:   Buffer table(data, length);
michael@0:   OpenTypeVHEA *vhea = new OpenTypeVHEA;
michael@0:   file->vhea = vhea;
michael@0: 
michael@0:   if (!table.ReadU32(&vhea->header.version)) {
michael@0:     return OTS_FAILURE_MSG("Failed to read version");
michael@0:   }
michael@0:   if (vhea->header.version != 0x00010000 &&
michael@0:       vhea->header.version != 0x00011000) {
michael@0:     return OTS_FAILURE_MSG("Bad vhea version %x", vhea->header.version);
michael@0:   }
michael@0: 
michael@0:   if (!ParseMetricsHeader(file, &table, &vhea->header)) {
michael@0:     return OTS_FAILURE_MSG("Failed to parse metrics in vhea");
michael@0:   }
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool ots_vhea_should_serialise(OpenTypeFile *file) {
michael@0:   // vhea should'nt serialise when vmtx doesn't exist.
michael@0:   // Firefox developer pointed out that vhea/vmtx should serialise iff GSUB is
michael@0:   // preserved. See http://crbug.com/77386
michael@0:   return file->vhea != NULL && file->vmtx != NULL &&
michael@0:       ots_gsub_should_serialise(file);
michael@0: }
michael@0: 
michael@0: bool ots_vhea_serialise(OTSStream *out, OpenTypeFile *file) {
michael@0:   if (!SerialiseMetricsHeader(file, out, &file->vhea->header)) {
michael@0:     return OTS_FAILURE_MSG("Failed to write vhea metrics");
michael@0:   }
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: void ots_vhea_free(OpenTypeFile *file) {
michael@0:   delete file->vhea;
michael@0: }
michael@0: 
michael@0: }  // namespace ots
michael@0: