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// Copyright (c) 2009 The Chromium 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 "cvt.h"
// cvt - Control Value Table
// http://www.microsoft.com/typography/otspec/cvt.htm
#define TABLE_NAME "cvt"
namespace ots {
bool ots_cvt_parse(Font *font, const uint8_t *data, size_t length) {
Buffer table(data, length);
OpenTypeCVT *cvt = new OpenTypeCVT;
font->cvt = cvt;
if (length >= 128 * 1024u) {
return OTS_FAILURE_MSG("Length (%d) > 120K"); // almost all cvt tables are less than 4k bytes.
}
if (length % 2 != 0) {
return OTS_FAILURE_MSG("Uneven cvt length (%d)", length);
}
if (!table.Skip(length)) {
return OTS_FAILURE_MSG("Length too high");
}
cvt->data = data;
cvt->length = length;
return true;
}
bool ots_cvt_should_serialise(Font *font) {
if (!font->glyf) {
return false; // this table is not for CFF fonts.
}
return font->cvt != NULL;
}
bool ots_cvt_serialise(OTSStream *out, Font *font) {
const OpenTypeCVT *cvt = font->cvt;
if (!out->Write(cvt->data, cvt->length)) {
return OTS_FAILURE_MSG("Failed to write CVT table");
}
return true;
}
void ots_cvt_reuse(Font *font, Font *other) {
font->cvt = other->cvt;
font->cvt_reused = true;
}
void ots_cvt_free(Font *font) {
delete font->cvt;
}
} // namespace ots
#undef TABLE_NAME
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