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|
/* secondary.{cc,hh} -- code for generating fake glyphs
*
* Copyright (c) 2003-2006 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.
*/
#include <config.h>
#include "secondary.hh"
#include "metrics.hh"
#include "automatic.hh"
#include "otftotfm.hh"
#include "util.hh"
#include <efont/t1bounds.hh>
#include <efont/t1font.hh>
#include <efont/t1rw.hh>
#include <efont/otfname.hh>
#include <efont/otfos2.hh>
#include <efont/otfpost.hh>
#include <efont/t1csgen.hh>
#include <efont/t1unparser.hh>
#include <efont/ttfcs.hh>
#include <lcdf/straccum.hh>
#include <stdarg.h>
#include <errno.h>
#include <limits.h>
#include <algorithm>
enum { U_EXCLAMDOWN = 0x00A1, // U+00A1 INVERTED EXCLAMATION MARK
U_DEGREE = 0x00B0, // U+00B0 DEGREE SIGN
U_QUESTIONDOWN = 0x00BF, // U+00BF INVERTED QUESTION MARK
U_IJ = 0x0132, // U+0132 LATIN CAPITAL LIGATURE IJ
U_ij = 0x0133, // U+0133 LATIN SMALL LIGATURE IJ
U_DOTLESSJ = 0x0237, // U+0237 LATIN SMALL LETTER DOTLESS J
U_RINGABOVE = 0x02DA, // U+02DA RING ABOVE
U_COMBININGRINGABOVE = 0x030A, // U+030A COMBINING RING ABOVE
U_CWM = 0x200C, // U+200C ZERO WIDTH NON-JOINER
U_ENDASH = 0x2013, // U+2013 EN DASH
U_PERTENTHOUSAND = 0x2031, // U+2031 PER TEN THOUSAND SIGN
U_INTERROBANG = 0x203D, // U+203D INTERROBANG
U_FRACTION = 0x2044, // U+2044 FRACTION SLASH
U_CENTIGRADE = 0x2103, // U+2103 DEGREE CELSIUS
U_ASTERISKMATH = 0x2217, // U+2217 ASTERISK OPERATOR
U_BARDBL = 0x2225, // U+2225 PARALLEL TO
U_VISIBLESPACE = 0x2423, // U+2423 OPEN BOX
U_DBLBRACKETLEFT = 0x27E6,
U_DBLBRACKETRIGHT = 0x27E7,
U_SS = 0xD800, // invalid Unicode
U_EMPTYSLOT = 0xD801, // invalid Unicode (not handled by Secondary)
U_ALTSELECTOR = 0xD802, // invalid Unicode
U_SSSMALL = 0xD803, // invalid Unicode
U_FFSMALL = 0xD804, // invalid Unicode
U_FISMALL = 0xD805, // invalid Unicode
U_FLSMALL = 0xD806, // invalid Unicode
U_FFISMALL = 0xD807, // invalid Unicode
U_FFLSMALL = 0xD808, // invalid Unicode
U_CAPITALCWM = 0xD809, // invalid Unicode
U_ASCENDERCWM = 0xD80A, // invalid Unicode
U_INTERROBANGDOWN = 0xD80B, // invalid Unicode
U_TWELVEUDASH = 0xD80C, // invalid Unicode
U_RINGFITTED = 0xD80D, // invalid Unicode
U_VS1 = 0xFE00,
U_VS16 = 0xFE0F,
U_VS17 = 0xE0100,
U_VS256 = 0xE01FF,
U_DOTLESSJ_2 = 0xF6BE,
U_THREEQUARTERSEMDASH = 0xF6DE,
U_FSMALL = 0xF766,
U_ISMALL = 0xF769,
U_LSMALL = 0xF76C,
U_SSMALL = 0xF773,
U_MATHDOTLESSJ = 0x1D6A5
};
FontInfo::FontInfo(const Efont::OpenType::Font *otf_, ErrorHandler *errh)
: otf(otf_), cmap(0), cff_file(0), cff(0), post(0), name(0), _nglyphs(-1),
_got_glyph_names(false), _ttb_program(0)
{
cmap = new Efont::OpenType::Cmap(otf->table("cmap"), errh);
assert(cmap->ok());
if (String cff_string = otf->table("CFF")) {
cff_file = new Efont::Cff(cff_string, errh);
if (!cff_file->ok())
return;
Efont::Cff::FontParent *fp = cff_file->font(PermString(), errh);
if (!fp || !fp->ok())
return;
if (!(cff = dynamic_cast<Efont::Cff::Font *>(fp))) {
errh->error("CID-keyed fonts not supported");
return;
}
_nglyphs = cff->nglyphs();
}
if (!cff) {
post = new Efont::OpenType::Post(otf->table("post"), errh);
// read number of glyphs from 'maxp' -- should probably be elsewhere
if (Efont::OpenType::Data maxp = otf->table("maxp"))
if (maxp.length() >= 6)
_nglyphs = maxp.u16(4);
if (_nglyphs < 0 && post->ok())
_nglyphs = post->nglyphs();
}
name = new Efont::OpenType::Name(otf->table("name"), errh);
}
FontInfo::~FontInfo()
{
delete cmap;
delete cff_file;
delete cff;
delete post;
delete name;
delete _ttb_program;
}
bool
FontInfo::ok() const
{
if (cff)
return cmap->ok() && cff->ok();
else
return post && post->ok() && name && name->ok();
}
bool
FontInfo::glyph_names(Vector<PermString> &glyph_names) const
{
program()->glyph_names(glyph_names);
return true;
}
int
FontInfo::glyphid(PermString name) const
{
if (cff)
return cff->glyphid(name);
else {
if (!_got_glyph_names) {
glyph_names(_glyph_names);
_got_glyph_names = true;
}
PermString *found = std::find(_glyph_names.begin(), _glyph_names.end(), name);
if (found == _glyph_names.end())
return 0;
return found - _glyph_names.begin();
}
}
String
FontInfo::family_name() const
{
if (cff)
return cff->dict_string(Efont::Cff::oFamilyName);
else
return name->english_name(Efont::OpenType::Name::N_FAMILY);
}
String
FontInfo::postscript_name() const
{
if (cff)
return cff->font_name();
else
return name->english_name(Efont::OpenType::Name::N_POSTSCRIPT);
}
const Efont::CharstringProgram *
FontInfo::program() const
{
if (cff)
return cff;
else {
if (!_ttb_program)
_ttb_program = new Efont::TrueTypeBoundsCharstringProgram(otf);
return _ttb_program;
}
}
bool
FontInfo::is_fixed_pitch() const
{
if (cff) {
double d;
return (cff->dict_value(Efont::Cff::oIsFixedPitch, &d) && d);
} else
return post->is_fixed_pitch();
}
double
FontInfo::italic_angle() const
{
if (cff) {
double d;
(void) cff->dict_value(Efont::Cff::oItalicAngle, &d);
return d;
} else
return post->italic_angle();
}
/* */
Secondary::~Secondary()
{
}
bool
Secondary::encode_uni(int code, PermString name, uint32_t uni, Metrics &metrics, ErrorHandler *errh)
{
Vector<Setting> v;
if (setting(uni, v, metrics, errh)) {
metrics.encode_virtual(code, name, uni, v);
return true;
} else if (_next)
return _next->encode_uni(code, name, uni, metrics, errh);
else
return false;
}
T1Secondary::T1Secondary(const FontInfo &finfo, const String &font_name,
const String &otf_file_name)
: _finfo(finfo), _font_name(font_name), _otf_file_name(otf_file_name),
_xheight(font_x_height(finfo, Transform())), _spacewidth(1000)
{
int bounds[4], width;
if (char_bounds(bounds, width, finfo, Transform(), ' '))
_spacewidth = width;
}
bool
Secondary::setting(uint32_t uni, Vector<Setting> &v, Metrics &metrics, ErrorHandler *errh)
{
if (_next)
return _next->setting(uni, v, metrics, errh);
else
return false;
}
bool
T1Secondary::char_setting(Vector<Setting> &v, Metrics &metrics, int uni, ...)
{
Vector<int> codes;
// collect codes
va_list val;
va_start(val, uni);
for (; uni; uni = va_arg(val, int)) {
int code = metrics.unicode_encoding(uni);
if (code < 0) {
Glyph glyph = _finfo.cmap->map_uni(uni);
if (glyph == 0 || (code = metrics.force_encoding(glyph)) < 0)
return false;
}
codes.push_back(code);
}
va_end(val);
// generate setting
for (int i = 0; i < codes.size(); i++) {
if (i)
v.push_back(Setting(Setting::KERN));
v.push_back(Setting(Setting::SHOW, codes[i], metrics.base_glyph(codes[i])));
}
return true;
}
bool
T1Secondary::encode_uni(int code, PermString name, uint32_t uni, Metrics &metrics, ErrorHandler *errh)
{
if (uni == U_ALTSELECTOR || (uni >= U_VS1 && uni <= U_VS16) || (uni >= U_VS17 && uni <= U_VS256)) {
Vector<Setting> v;
setting(uni, v, metrics, errh);
int which = (uni == U_ALTSELECTOR ? 0 : (uni <= U_VS16 ? uni - U_VS1 + 1 : uni - U_VS17 + 17));
metrics.encode_virtual(code, (which ? permprintf("<vs%d>", which) : PermString("<altselector>")), uni, v);
metrics.add_altselector_code(code, which);
return true;
} else
return Secondary::encode_uni(code, name, uni, metrics, errh);
}
static String dotlessj_file_name;
static String
dotlessj_dvips_include(const String &, const FontInfo &, ErrorHandler *)
{
return "<" + pathname_filename(dotlessj_file_name);
}
int
T1Secondary::dotlessj_font(Metrics &metrics, ErrorHandler *errh, Glyph &dj_glyph)
{
if (!_font_name || !_finfo.otf || !_finfo.cff)
return -1;
String dj_name = suffix_font_name(_font_name, "--lcdfj");
for (int i = 0; i < metrics.n_mapped_fonts(); i++)
if (metrics.mapped_font_name(i) == dj_name)
return i;
if (String filename = installed_type1_dotlessj(_otf_file_name, _finfo.cff->font_name(), (output_flags & G_DOTLESSJ), errh)) {
// check for special case: "\0" means the font's "j" is already
// dotless
if (filename == String("\0", 1))
return J_NODOT;
// open dotless-j font file
FILE *f = fopen(filename.c_str(), "rb");
if (!f) {
errh->error("%s: %s", filename.c_str(), strerror(errno));
return -1;
}
// read font
Efont::Type1Reader *reader;
int c = getc(f);
ungetc(c, f);
if (c == 128)
reader = new Efont::Type1PFBReader(f);
else
reader = new Efont::Type1PFAReader(f);
Efont::Type1Font *font = new Efont::Type1Font(*reader);
delete reader;
if (!font->ok()) {
errh->error("%s: no glyphs in dotless-J font", filename.c_str());
delete font;
return -1;
}
// create metrics for dotless-J
Metrics dj_metrics(font, 256);
Vector<PermString> glyph_names;
font->glyph_names(glyph_names);
Vector<PermString>::iterator g = std::find(glyph_names.begin(), glyph_names.end(), "uni0237");
if (g != glyph_names.end()) {
dj_glyph = g - glyph_names.begin();
dj_metrics.encode('j', U_DOTLESSJ, dj_glyph);
} else {
errh->error("%s: dotless-J font has no 'uni0237' glyph", filename.c_str());
delete font;
return -1;
}
::dotlessj_file_name = filename;
output_metrics(dj_metrics, font->font_name(), -1, _finfo, String(), String(), dj_name, dotlessj_dvips_include, errh);
// add font to metrics
return metrics.add_mapped_font(font, dj_name);
} else
return -1;
}
bool
T1Secondary::setting(uint32_t uni, Vector<Setting> &v, Metrics &metrics, ErrorHandler *errh)
{
Transform xform;
int vsize = v.size();
switch (uni) {
case U_CWM:
case U_ALTSELECTOR:
v.push_back(Setting(Setting::RULE, 0, _xheight));
return true;
case U_CAPITALCWM:
v.push_back(Setting(Setting::RULE, 0, font_cap_height(_finfo, xform)));
return true;
case U_ASCENDERCWM:
v.push_back(Setting(Setting::RULE, 0, font_ascender(_finfo, xform)));
return true;
case U_VISIBLESPACE:
v.push_back(Setting(Setting::MOVE, 50, -150));
v.push_back(Setting(Setting::RULE, 40, 150));
v.push_back(Setting(Setting::RULE, _spacewidth, 40));
v.push_back(Setting(Setting::RULE, 40, 150));
v.push_back(Setting(Setting::MOVE, 50, 150));
return true;
case U_SS:
if (char_setting(v, metrics, 'S', 'S', 0))
return true;
break;
case U_SSSMALL:
if (char_setting(v, metrics, U_SSMALL, U_SSMALL, 0))
return true;
else if (char_setting(v, metrics, 's', 's', 0))
return true;
break;
case U_FFSMALL:
if (char_setting(v, metrics, U_FSMALL, U_FSMALL, 0))
return true;
else if (char_setting(v, metrics, 'f', 'f', 0))
return true;
break;
case U_FISMALL:
if (char_setting(v, metrics, U_FSMALL, U_ISMALL, 0))
return true;
else if (char_setting(v, metrics, 'f', 'i', 0))
return true;
break;
case U_FLSMALL:
if (char_setting(v, metrics, U_FSMALL, U_LSMALL, 0))
return true;
else if (char_setting(v, metrics, 'f', 'l', 0))
return true;
break;
case U_FFISMALL:
if (char_setting(v, metrics, U_FSMALL, U_FSMALL, U_ISMALL, 0))
return true;
else if (char_setting(v, metrics, 'f', 'f', 'i', 0))
return true;
break;
case U_FFLSMALL:
if (char_setting(v, metrics, U_FSMALL, U_FSMALL, U_LSMALL, 0))
return true;
else if (char_setting(v, metrics, 'f', 'f', 'l', 0))
return true;
break;
case U_IJ:
if (char_setting(v, metrics, 'I', 'J', 0))
return true;
break;
case U_ij:
if (char_setting(v, metrics, 'i', 'j', 0))
return true;
break;
case U_DOTLESSJ:
case U_DOTLESSJ_2:
case U_MATHDOTLESSJ: {
Glyph dj_glyph;
int which = dotlessj_font(metrics, errh, dj_glyph);
if (which >= 0) {
v.push_back(Setting(Setting::FONT, which));
v.push_back(Setting(Setting::SHOW, 'j', dj_glyph));
return true;
} else if (which == J_NODOT && char_setting(v, metrics, 'j', 0))
return true;
break;
}
case U_DBLBRACKETLEFT:
if (char_setting(v, metrics, '[', 0)) {
if (!_finfo.is_fixed_pitch()) {
double d = char_one_bound(_finfo, xform, 4, true, 0, '[', 0);
v.push_back(Setting(Setting::MOVE, (int) (-0.666 * d), 0));
}
char_setting(v, metrics, '[', 0);
return true;
}
break;
case U_DBLBRACKETRIGHT:
if (char_setting(v, metrics, ']', 0)) {
if (!_finfo.is_fixed_pitch()) {
double d = char_one_bound(_finfo, xform, 4, true, 0, ']', 0);
v.push_back(Setting(Setting::MOVE, (int) (-0.666 * d), 0));
}
char_setting(v, metrics, ']', 0);
return true;
}
break;
case U_BARDBL:
if (char_setting(v, metrics, '|', 0)) {
if (!_finfo.is_fixed_pitch()) {
double d = char_one_bound(_finfo, Transform(), 4, true, 0, '|', 0);
v.push_back(Setting(Setting::MOVE, (int) (-0.333 * d), 0));
}
char_setting(v, metrics, '|', 0);
return true;
}
break;
case U_ASTERISKMATH: {
int bounds[5];
double dropdown = 0;
if (char_bounds(bounds, bounds[4], _finfo, xform, '*'))
dropdown += std::max(bounds[3], 0) + std::min(bounds[1], 0);
if (char_bounds(bounds, bounds[4], _finfo, xform, '('))
dropdown -= std::max(bounds[3], 0) + std::min(bounds[1], 0);
v.push_back(Setting(Setting::MOVE, 0, (int) (-dropdown / 2)));
if (char_setting(v, metrics, '*', 0))
return true;
break;
}
case U_TWELVEUDASH:
if (char_setting(v, metrics, U_ENDASH, 0)) {
if (!_finfo.is_fixed_pitch()) {
double d = char_one_bound(_finfo, xform, 4, true, 0, U_ENDASH, 0);
v.push_back(Setting(Setting::MOVE, (int) (667 - 2 * d), 0));
}
char_setting(v, metrics, U_ENDASH, 0);
return true;
}
break;
case U_THREEQUARTERSEMDASH:
if (char_setting(v, metrics, U_ENDASH, 0)) {
if (!_finfo.is_fixed_pitch()) {
double d = char_one_bound(_finfo, xform, 4, true, 0, U_ENDASH, 0);
v.push_back(Setting(Setting::MOVE, (int) (750 - 2 * d), 0));
}
char_setting(v, metrics, U_ENDASH, 0);
return true;
}
break;
case U_CENTIGRADE:
// TODO: set italic correction to that of a 'C'
if (char_setting(v, metrics, U_DEGREE, 'C', 0))
return true;
break;
case U_INTERROBANG: {
double exclam_offset =
(char_one_bound(_finfo, xform, 4, true, 0, '?', 0)
- char_one_bound(_finfo, xform, 4, true, 0, '!', 0)) * 0.5 + 50;
v.push_back(Setting(Setting::PUSH));
v.push_back(Setting(Setting::MOVE, (int) exclam_offset, 0));
if (char_setting(v, metrics, '!', 0)) {
v.push_back(Setting(Setting::POP));
if (char_setting(v, metrics, '?', 0))
return true;
}
break;
}
case U_INTERROBANGDOWN: {
double exclam_offset =
(char_one_bound(_finfo, xform, 4, true, 0, U_QUESTIONDOWN, 0)
- char_one_bound(_finfo, xform, 4, true, 0, U_EXCLAMDOWN, 0)) * 0.5 + 50;
v.push_back(Setting(Setting::PUSH));
v.push_back(Setting(Setting::MOVE, (int) exclam_offset, 0));
if (char_setting(v, metrics, U_EXCLAMDOWN, 0)) {
v.push_back(Setting(Setting::POP));
if (char_setting(v, metrics, U_QUESTIONDOWN, 0))
return true;
}
break;
}
case U_PERTENTHOUSAND:
if (char_setting(v, metrics, 0xF661, U_FRACTION, 0xF655, 0xF655, 0xF655, 0))
return true;
break;
case U_RINGFITTED: {
int A_width = char_one_bound(_finfo, xform, 4, true, -1000, 'A', 0);
uint32_t ring_char = U_RINGABOVE;
int ring_width = char_one_bound(_finfo, xform, 4, true, -1000, ring_char, 0);
if (ring_width <= -1000) {
ring_char = U_COMBININGRINGABOVE;
ring_width = char_one_bound(_finfo, xform, 4, true, -1000, ring_char, 0);
}
if (A_width > -1000 && ring_width > -1000) {
int offset = (A_width - ring_width) / 2;
v.push_back(Setting(Setting::MOVE, offset, 0));
if (char_setting(v, metrics, ring_char, 0)) {
v.push_back(Setting(Setting::MOVE, A_width - ring_width - offset, 0));
return true;
}
}
break;
}
}
// didn't find a good setting, restore v to pristine state
while (v.size() > vsize)
v.pop_back();
// variant selectors get the same setting as ALTSELECTOR
if ((uni >= U_VS1 && uni <= U_VS16) || (uni >= U_VS17 && uni <= U_VS256))
return setting(U_ALTSELECTOR, v, metrics, errh);
// otherwise, try other secondaries
return Secondary::setting(uni, v, metrics, errh);
}
bool
char_bounds(int bounds[4], int &width, const FontInfo &finfo,
const Transform &transform, uint32_t uni)
{
if (Efont::OpenType::Glyph g = finfo.cmap->map_uni(uni))
return Efont::CharstringBounds::bounds(transform, finfo.program()->glyph_context(g), bounds, width);
else
return false;
}
int
char_one_bound(const FontInfo &finfo, const Transform &transform,
int dimen, bool max, int best, uint32_t uni, ...)
{
int bounds[5];
va_list val;
va_start(val, uni);
while (uni != 0) {
if (char_bounds(bounds, bounds[4], finfo, transform, uni))
if (max ? bounds[dimen] > best : bounds[dimen] < best)
best = bounds[dimen];
uni = va_arg(val, uint32_t);
}
va_end(val);
return best;
}
int
font_x_height(const FontInfo &finfo, const Transform &font_xform)
{
try {
Efont::OpenType::Os2 os2(finfo.otf->table("OS/2"));
return os2.x_height();
} catch (Efont::OpenType::Bounds) {
// XXX what if 'x', 'm', 'z' were subject to substitution?
return char_one_bound(finfo, font_xform, 3, false, 1000,
'x', 'm', 'z', 0);
}
}
int
font_cap_height(const FontInfo &finfo, const Transform &font_xform)
{
try {
Efont::OpenType::Os2 os2(finfo.otf->table("OS/2"));
return os2.cap_height();
} catch (Efont::OpenType::Bounds) {
// XXX what if 'H', 'O', 'B' were subject to substitution?
return char_one_bound(finfo, font_xform, 3, false, 1000,
'H', 'O', 'B', 0);
}
}
int
font_ascender(const FontInfo &finfo, const Transform &font_xform)
{
try {
Efont::OpenType::Os2 os2(finfo.otf->table("OS/2"));
return os2.typo_ascender();
} catch (Efont::OpenType::Bounds) {
// XXX what if 'd', 'l' were subject to substitution?
return char_one_bound(finfo, font_xform, 3, true,
font_x_height(finfo, font_xform),
'd', 'l', 0);
}
}
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