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// -*- related-file-name: "../include/efont/otfgpos.hh" -*-
/* otfgpos.{cc,hh} -- OpenType GPOS table
*
* Copyright (c) 2003-2012 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/otfgpos.hh>
#include <lcdf/error.hh>
#include <lcdf/straccum.hh>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
namespace Efont { namespace OpenType {
/**************************
* Gpos *
* *
**************************/
Gpos::Gpos(const Data &d, ErrorHandler *errh) throw (Error)
{
// Fixed Version
// Offset ScriptList
// Offset FeatureList
// Offset LookupList
if (d.length() == 0)
throw BlankTable("GPOS");
if (d.u16(0) != 1)
throw Format("GPOS");
if (_script_list.assign(d.offset_subtable(4), errh) < 0)
throw Format("GPOS script list");
if (_feature_list.assign(d.offset_subtable(6), errh) < 0)
throw Format("GPOS feature list");
_lookup_list = d.offset_subtable(8);
}
int
Gpos::nlookups() const
{
return _lookup_list.u16(0);
}
GposLookup
Gpos::lookup(unsigned i) const
{
if (i >= _lookup_list.u16(0))
throw Error("GPOS lookup out of range");
else
return GposLookup(_lookup_list.offset_subtable(2 + i*2));
}
/**************************
* GposValue *
* *
**************************/
const int GposValue::nibble_bitcount_x2[] = { 0, 2, 2, 4, 2, 4, 4, 6,
2, 4, 4, 6, 4, 6, 6, 8 };
/**************************
* GposLookup *
* *
**************************/
GposLookup::GposLookup(const Data &d) throw (Error)
: _d(d)
{
if (_d.length() < 6)
throw Format("GPOS Lookup table");
_type = _d.u16(0);
if (_type == L_EXTENSION && _d.u16(4) != 0) {
Data first_subtable = _d.offset_subtable(HEADERSIZE);
if (first_subtable.length() < 8 || first_subtable.u16(0) != 1)
throw Format("GPOS Extension Lookup table");
_type = first_subtable.u16(2);
}
}
Data
GposLookup::subtable(int i) const
{
Data subd = _d.offset_subtable(HEADERSIZE + i*RECSIZE);
if (_d.u16(0) != L_EXTENSION)
return subd;
else if (subd.length() >= 8 && subd.u16(0) == 1 && subd.u16(2) == _type)
return subd.subtable(subd.u32(4));
else
return Data();
}
bool
GposLookup::unparse_automatics(Vector<Positioning> &v, ErrorHandler *errh) const
{
int nlookup = _d.u16(4), success = 0;
switch (_type) {
case L_SINGLE:
for (int i = 0; i < nlookup; i++)
try {
GposSingle s(subtable(i));
s.unparse(v);
success++;
} catch (Error e) {
if (errh)
errh->warning("%s, continuing", e.description.c_str());
}
return success > 0;
case L_PAIR:
for (int i = 0; i < nlookup; i++)
try {
GposPair p(subtable(i));
p.unparse(v);
success++;
} catch (Error e) {
if (errh)
errh->warning("%s, continuing", e.description.c_str());
}
return success > 0;
default:
return false;
}
}
/**************************
* GposSingle *
* *
**************************/
GposSingle::GposSingle(const Data &d) throw (Error)
: _d(d)
{
if (_d[0] != 0
|| (_d[1] != 1 && _d[1] != 2))
throw Format("GPOS Single Positioning");
Coverage coverage(_d.offset_subtable(2));
if (!coverage.ok()
|| (_d[1] == 2 && coverage.size() > _d.u16(6)))
throw Format("GPOS Single Positioning coverage");
}
Coverage
GposSingle::coverage() const throw ()
{
return Coverage(_d.offset_subtable(2), 0, false);
}
void
GposSingle::unparse(Vector<Positioning> &v) const
{
if (_d[1] == 1) {
int format = _d.u16(4);
Data value = _d.subtable(6);
for (Coverage::iterator i = coverage().begin(); i; i++)
v.push_back(Positioning(Position(*i, format, value)));
} else {
int format = _d.u16(4);
int size = GposValue::size(format);
for (Coverage::iterator i = coverage().begin(); i; i++)
v.push_back(Positioning(Position(*i, format, _d.subtable(F2_HEADERSIZE + size*i.coverage_index()))));
}
}
/**************************
* GposPair *
* *
**************************/
GposPair::GposPair(const Data &d) throw (Error)
: _d(d)
{
if (_d[0] != 0
|| (_d[1] != 1 && _d[1] != 2))
throw Format("GPOS Pair Positioning");
Coverage coverage(_d.offset_subtable(2));
if (!coverage.ok()
|| (_d[1] == 1 && coverage.size() > _d.u16(8)))
throw Format("GPOS Pair Positioning coverage");
}
Coverage
GposPair::coverage() const throw ()
{
return Coverage(_d.offset_subtable(2), 0, false);
}
void
GposPair::unparse(Vector<Positioning> &v) const
{
if (_d[1] == 1) {
int format1 = _d.u16(4);
int format2 = _d.u16(6);
int f2_pos = PAIRVALUE_HEADERSIZE + GposValue::size(format1);
int pairvalue_size = f2_pos + GposValue::size(format2);
for (Coverage::iterator i = coverage().begin(); i; i++) {
Data pairset = _d.offset_subtable(F1_HEADERSIZE + i.coverage_index()*F1_RECSIZE);
int npair = pairset.u16(0);
for (int j = 0; j < npair; j++) {
Data pair = pairset.subtable(PAIRSET_HEADERSIZE + j*pairvalue_size);
v.push_back(Positioning(Position(*i, format1, pair.subtable(PAIRVALUE_HEADERSIZE)),
Position(pair.u16(0), format2, pair.subtable(f2_pos))));
}
}
} else { // _d[1] == 2
int format1 = _d.u16(4);
int format2 = _d.u16(6);
int f2_pos = GposValue::size(format1);
int recsize = f2_pos + GposValue::size(format2);
ClassDef class1(_d.offset_subtable(8));
ClassDef class2(_d.offset_subtable(10));
Coverage coverage = this->coverage();
int nclass1 = _d.u16(12);
int nclass2 = _d.u16(14);
int offset = F2_HEADERSIZE;
for (int c1 = 0; c1 < nclass1; c1++)
for (int c2 = 0; c2 < nclass2; c2++, offset += recsize) {
Position p1(format1, _d.subtable(offset));
Position p2(format2, _d.subtable(offset + f2_pos));
if (p1 || p2) {
for (ClassDef::class_iterator c1i = class1.begin(c1, coverage); c1i; c1i++)
for (ClassDef::class_iterator c2i = class2.begin(c2); c2i; c2i++)
v.push_back(Positioning(Position(*c1i, p1), Position(*c2i, p2)));
}
}
}
}
/**************************
* Positioning *
* *
**************************/
static void
unparse_glyphid(StringAccum &sa, Glyph gid, const Vector<PermString> *gns)
{
if (!gns)
gns = &debug_glyph_names;
if (gid && gns && gns->size() > gid && (*gns)[gid])
sa << (*gns)[gid];
else
sa << "g" << gid;
}
void
Position::unparse(StringAccum &sa, const Vector<PermString> *gns) const
{
unparse_glyphid(sa, g, gns);
if (placed())
sa << '@' << pdx << ',' << pdy;
sa << '+' << adx;
if (ady)
sa << '/' << ady;
}
String
Position::unparse(const Vector<PermString> *gns) const
{
StringAccum sa;
unparse(sa, gns);
return sa.take_string();
}
bool
Positioning::context_in(const Coverage &c) const
{
return (c.covers(_left.g) || !_left.g) && (!_right.g || c.covers(_right.g));
}
bool
Positioning::context_in(const GlyphSet &gs) const
{
return (gs.covers(_left.g) || !_left.g) && (!_right.g || gs.covers(_right.g));
}
void
Positioning::unparse(StringAccum &sa, const Vector<PermString> *gns) const
{
if (!*this)
sa << "NULL[]";
else if (is_single()) {
sa << "SINGLE[";
_left.unparse(sa, gns);
sa << ']';
} else if (is_pairkern()) {
sa << "KERN[";
unparse_glyphid(sa, _left.g, gns);
sa << ' ';
unparse_glyphid(sa, _right.g, gns);
sa << "+" << _left.adx << ']';
} else if (is_pair()) {
sa << "PAIR[";
_left.unparse(sa, gns);
sa << ' ';
_right.unparse(sa, gns);
sa << ']';
} else
sa << "UNKNOWN[]";
}
String
Positioning::unparse(const Vector<PermString> *gns) const
{
StringAccum sa;
unparse(sa, gns);
return sa.take_string();
}
}}
#include <lcdf/vector.cc>
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