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// -*- related-file-name: "../include/efont/ttfkern.hh" -*-
/* ttfkern.{cc,hh} -- TrueType kern table
*
* Copyright (c) 2009 Eddie Kohler
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version. This program is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <efont/ttfkern.hh>
#include <lcdf/error.hh>
#include <lcdf/straccum.hh>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
namespace Efont { namespace OpenType {
inline Data
KernTable::subtable(uint32_t &off_in_out) const throw (Error)
{
uint32_t off = off_in_out, len;
if (_version == 0) {
if (_d.u16(off) != 0)
throw new Format("kern subtable");
len = _d.u16(off + 2);
} else
len = _d.u32(off);
if (len < 6 || off + len > (uint32_t) _d.length())
throw new Bounds();
off_in_out = off + len;
return _d.substring(off, len);
}
KernTable::KernTable(const Data &d, ErrorHandler *) throw (Error)
: _d(d), _error(-1)
{
// USHORT Version
// USHORT nTables
if (d.length() == 0)
throw BlankTable("kern");
uint32_t ntables, off;
if (d.u16(0) == 0) {
ntables = d.u16(2);
_version = 0;
off = 4;
} else if (d.u16(0) == 1) {
ntables = d.u32(4);
_version = 1;
off = 8;
} else
throw Format("kern");
for (uint32_t i = 0; i < ntables; ++i)
(void) subtable(off);
_error = 0;
}
bool
KernTable::unparse_automatics(Vector<Positioning> &v, ErrorHandler *errh) const
{
uint32_t ntables = this->ntables();
uint32_t off = first_offset();
int success = 0;
if (_error < 0)
return false;
for (uint16_t i = 0; i < ntables; ++i) {
Data subt = _d.subtable(off);
uint16_t coverage = subt.u16(4);
if (_version == 0) {
if ((coverage & COV_V0_HORIZONTAL) == 0
|| (coverage & (COV_V0_MINIMUM | COV_V0_CROSS_STREAM
| COV_V0_OVERRIDE)) != 0
|| (coverage & COV_V0_FORMAT) != COV_V0_FORMAT0)
continue;
} else {
if ((coverage & (COV_V1_VERTICAL | COV_V1_CROSS_STREAM
| COV_V1_VARIATION)) != 0
|| (coverage & COV_V1_FORMAT) != COV_V1_FORMAT0)
continue;
}
try {
uint32_t off = (_version ? 16 : 14);
uint16_t npairs = subt.u16(off - 8);
for (uint16_t j = 0; j < npairs; ++j, off += 6) {
v.push_back(Positioning(Position(subt.u16(off), 0, 0, subt.s16(off + 4), 0),
Position(subt.u16(off + 2), 0, 0, 0, 0)));
++success;
}
} catch (Error e) {
if (errh)
errh->warning("%s, continuing", e.description.c_str());
}
}
return success > 0;
}
}}
#include <lcdf/vector.cc>
|