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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 "ltsh.h"
#include "maxp.h"
// LTSH - Linear Threshold
// http://www.microsoft.com/typography/otspec/ltsh.htm
#define DROP_THIS_TABLE \
do { delete file->ltsh; file->ltsh = 0; } while (0)
namespace ots {
bool ots_ltsh_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
Buffer table(data, length);
if (!file->maxp) {
return OTS_FAILURE();
}
OpenTypeLTSH *ltsh = new OpenTypeLTSH;
file->ltsh = ltsh;
uint16_t num_glyphs = 0;
if (!table.ReadU16(<sh->version) ||
!table.ReadU16(&num_glyphs)) {
return OTS_FAILURE();
}
if (ltsh->version != 0) {
OTS_WARNING("bad version: %u", ltsh->version);
DROP_THIS_TABLE;
return true;
}
if (num_glyphs != file->maxp->num_glyphs) {
OTS_WARNING("bad num_glyphs: %u", num_glyphs);
DROP_THIS_TABLE;
return true;
}
ltsh->ypels.reserve(num_glyphs);
for (unsigned i = 0; i < num_glyphs; ++i) {
uint8_t pel = 0;
if (!table.ReadU8(&pel)) {
return OTS_FAILURE();
}
ltsh->ypels.push_back(pel);
}
return true;
}
bool ots_ltsh_should_serialise(OpenTypeFile *file) {
if (!file->glyf) return false; // this table is not for CFF fonts.
return file->ltsh != NULL;
}
bool ots_ltsh_serialise(OTSStream *out, OpenTypeFile *file) {
const OpenTypeLTSH *ltsh = file->ltsh;
if (!out->WriteU16(ltsh->version) ||
!out->WriteU16(ltsh->ypels.size())) {
return OTS_FAILURE();
}
for (unsigned i = 0; i < ltsh->ypels.size(); ++i) {
if (!out->Write(&(ltsh->ypels[i]), 1)) {
return OTS_FAILURE();
}
}
return true;
}
void ots_ltsh_free(OpenTypeFile *file) {
delete file->ltsh;
}
} // namespace ots
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