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/*************************************************************************
** Font.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2015 Martin Gieseking <martin.gieseking@uos.de> **
** **
** 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 3 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. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <config.h>
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <sstream>
#include "CMap.h"
#include "FileFinder.h"
#include "FileSystem.h"
#include "Font.h"
#include "FontEncoding.h"
#include "FontEngine.h"
#include "GFGlyphTracer.h"
#include "Glyph.h"
#include "Message.h"
#include "MetafontWrapper.h"
#include "TFM.h"
#include "VFReader.h"
#include "SignalHandler.h"
#include "Subfont.h"
#include "SVGTree.h"
#include "Unicode.h"
#include "macros.h"
using namespace std;
UInt32 Font::unicode (UInt32 c) const {
return Unicode::charToCodepoint(c);
}
/** Returns the encoding object of this font which is asigned in a map file.
* If there's no encoding assigned, the function returns 0. */
const FontEncoding* Font::encoding () const {
if (const FontMap::Entry *entry = fontMapEntry())
return FontEncoding::encoding(entry->encname);
return 0;
}
const FontMap::Entry* Font::fontMapEntry () const {
string fontname = name();
size_t pos = fontname.rfind('.');
if (pos != string::npos)
fontname = fontname.substr(0, pos); // strip extension
return FontMap::instance().lookup(fontname);
}
/** Compute the extents of a given glyph.
* @param[in] c character code of glyph
* @param[in] vertical true if is glyph is part of vertical aligned text
* @param[out] metrics the resulting extents */
void Font::getGlyphMetrics (int c, bool vertical, GlyphMetrics &metrics) const {
double s = scaleFactor();
if (vertical) { // get metrics for vertical text flow?
if (verticalLayout()) { // is the font designed for vertical texts?
metrics.wl = s*charDepth(c);
metrics.wr = s*charHeight(c);
metrics.h = 0;
metrics.d = s*charWidth(c);
}
else { // rotate box by 90 degrees for alphabetic text
metrics.wl = s*charDepth(c);
metrics.wr = s*charHeight(c);
metrics.h = 0;
metrics.d = s*(charWidth(c)+italicCorr(c));
}
}
else {
metrics.wl = 0;
metrics.wr = s*(charWidth(c)+italicCorr(c));
metrics.h = s*charHeight(c);
metrics.d = s*charDepth(c);
}
}
const char* Font::filename () const {
const char *fname = strrchr(path(), '/');
if (fname)
return fname+1;
return path();
}
///////////////////////////////////////////////////////////////////////////////////////
TFMFont::TFMFont (string name, UInt32 cs, double ds, double ss)
: _metrics(0), _fontname(name), _checksum(cs), _dsize(ds), _ssize(ss)
{
}
TFMFont::~TFMFont () {
delete _metrics;
}
/** Returns a font metrics object for the current font.
* @throw FontException if TFM file can't be found */
const FontMetrics* TFMFont::getMetrics () const {
if (!_metrics) {
try {
_metrics = FontMetrics::read(_fontname.c_str());
if (!_metrics) {
_metrics = new NullFontMetric;
Message::wstream(true) << "can't find "+_fontname+".tfm\n";
}
}
catch (FontMetricException &e) {
_metrics = new NullFontMetric;
Message::wstream(true) << e.what() << " in " << _fontname << ".tfm\n";
}
}
return _metrics;
}
double TFMFont::charWidth (int c) const {
double w = getMetrics() ? getMetrics()->getCharWidth(c) : 0;
if (style()) {
w *= style()->extend;
w += fabs(style()->slant*charHeight(c)); // slant := tan(phi) = dx/height
}
return w;
}
double TFMFont::italicCorr (int c) const {
double w = getMetrics() ? getMetrics()->getItalicCorr(c) : 0;
if (style())
w *= style()->extend;
return w;
}
double TFMFont::charDepth (int c) const {return getMetrics() ? getMetrics()->getCharDepth(c) : 0;}
double TFMFont::charHeight (int c) const {return getMetrics() ? getMetrics()->getCharHeight(c) : 0;}
/** Tests if the checksum of the font matches that of the corresponding TFM file. */
bool TFMFont::verifyChecksums () const {
if (_checksum != 0 && getMetrics() && getMetrics()->getChecksum() != 0)
return _checksum == getMetrics()->getChecksum();
return true;
}
//////////////////////////////////////////////////////////////////////////////
// static class variables
bool PhysicalFont::EXACT_BBOX = false;
bool PhysicalFont::KEEP_TEMP_FILES = false;
const char *PhysicalFont::CACHE_PATH = 0;
double PhysicalFont::METAFONT_MAG = 4;
FontCache PhysicalFont::_cache;
Font* PhysicalFont::create (string name, UInt32 checksum, double dsize, double ssize, PhysicalFont::Type type) {
return new PhysicalFontImpl(name, 0, checksum, dsize, ssize, type);
}
Font* PhysicalFont::create (string name, int fontindex, UInt32 checksum, double dsize, double ssize) {
return new PhysicalFontImpl(name, fontindex, checksum, dsize, ssize, PhysicalFont::TTC);
}
const char* PhysicalFont::path () const {
const char *ext=0;
switch (type()) {
case OTF: ext = "otf"; break;
case PFB: ext = "pfb"; break;
case TTC: ext = "ttc"; break;
case TTF: ext = "ttf"; break;
case MF : ext = "mf"; break;
default : ext = 0;
}
if (ext)
return FileFinder::lookup(name()+"."+ext);
return FileFinder::lookup(name());
}
/** Returns true if this font is CID-based. */
bool PhysicalFont::isCIDFont () const {
if (type() == MF)
return false;
FontEngine::instance().setFont(*this);
return FontEngine::instance().isCIDFont();
}
/** Retrieve the IDs of all charachter maps available in the font file.
* @param[out] charMapIDs IDs of the found character maps
* @return number of found character maps */
int PhysicalFont::collectCharMapIDs (std::vector<CharMapID> &charMapIDs) const {
if (type() == MF)
return 0;
FontEngine::instance().setFont(*this);
return FontEngine::instance().getCharMapIDs(charMapIDs);
}
/** Decodes a character code used in the DVI file to the code required to
* address the correct character in the font.
* @param[in] c DVI character to decode
* @return target character code or name */
Character PhysicalFont::decodeChar (UInt32 c) const {
if (const FontEncoding *enc = encoding())
return enc->decode(c);
return Character(Character::CHRCODE, c);
}
/** Returns the number of units per EM. The EM square is the virtual area a glyph is designed on.
* All coordinates used to specify portions of the glyph are relative to the origin (0,0) at the
* lower left corner of this square, while the upper right corner is located at (m,m), where m
* is an integer value defined with the font, and returned by this function. */
int PhysicalFont::unitsPerEm() const {
if (type() == MF)
return 1000;
FontEngine::instance().setFont(*this);
return FontEngine::instance().getUnitsPerEM();
}
int PhysicalFont::hAdvance () const {
if (type() == MF)
return 0;
FontEngine::instance().setFont(*this);
return FontEngine::instance().getHAdvance();
}
double PhysicalFont::hAdvance (int c) const {
if (type() == MF)
return unitsPerEm()*charWidth(c)/designSize();
FontEngine::instance().setFont(*this);
if (const FontMap::Entry *entry = fontMapEntry())
if (Subfont *sf = entry->subfont)
c = sf->decode(c);
return FontEngine::instance().getHAdvance(decodeChar(c));
}
double PhysicalFont::vAdvance (int c) const {
if (type() == MF)
return unitsPerEm()*charWidth(c)/designSize();
FontEngine::instance().setFont(*this);
if (const FontMap::Entry *entry = fontMapEntry())
if (Subfont *sf = entry->subfont)
c = sf->decode(c);
return FontEngine::instance().getVAdvance(decodeChar(c));
}
string PhysicalFont::glyphName (int c) const {
if (type() == MF)
return "";
FontEngine::instance().setFont(*this);
if (const FontMap::Entry *entry = fontMapEntry())
if (Subfont *sf = entry->subfont)
c = sf->decode(c);
return FontEngine::instance().getGlyphName(decodeChar(c));
}
double PhysicalFont::scaledAscent() const {
return ascent()*scaledSize()/unitsPerEm();
}
int PhysicalFont::ascent () const {
if (type() == MF)
return 0;
FontEngine::instance().setFont(*this);
return FontEngine::instance().getAscender();
}
int PhysicalFont::descent () const {
if (type() == MF)
return 0;
FontEngine::instance().setFont(*this);
return FontEngine::instance().getDescender();
}
/** Extracts the glyph outlines of a given character.
* @param[in] c character code of requested glyph
* @param[out] glyph path segments of the glyph outline
* @param[in] cb optional callback object for tracer class
* @return true if outline could be computed */
bool PhysicalFont::getGlyph (int c, GraphicsPath<Int32> &glyph, GFGlyphTracer::Callback *cb) const {
if (type() == MF) {
const Glyph *cached_glyph=0;
if (CACHE_PATH) {
_cache.write(CACHE_PATH);
_cache.read(name().c_str(), CACHE_PATH);
cached_glyph = _cache.getGlyph(c);
}
if (cached_glyph) {
glyph = *cached_glyph;
return true;
}
else {
string gfname;
if (createGF(gfname)) {
try {
double ds = getMetrics() ? getMetrics()->getDesignSize() : 1;
GFGlyphTracer tracer(gfname, unitsPerEm()/ds, cb);
tracer.setGlyph(glyph);
tracer.executeChar(c);
glyph.closeOpenSubPaths();
if (CACHE_PATH)
_cache.setGlyph(c, glyph);
return true;
}
catch (GFException &e) {
// @@ print error message
}
}
else {
Message::wstream(true) << "failed creating " << name() << ".gf\n";
}
}
}
else { // vector fonts (OTF, PFB, TTF, TTC)
bool ok=true;
FontEngine::instance().setFont(*this);
if (const FontMap::Entry *entry = fontMapEntry())
if (Subfont *sf = entry->subfont)
c = sf->decode(c);
ok = FontEngine::instance().traceOutline(decodeChar(c), glyph, false);
glyph.closeOpenSubPaths();
return ok;
}
return false;
}
/** Creates a GF file for this font object.
* @param[out] gfname name of GF font file
* @return true on success */
bool PhysicalFont::createGF (string &gfname) const {
SignalHandler::instance().check();
gfname = name()+".gf";
MetafontWrapper mf(name());
bool ok = mf.make("ljfour", METAFONT_MAG); // call Metafont if necessary
return ok && mf.success() && getMetrics();
}
/** Traces all glyphs of the current font and stores them in the cache. If caching is disabled, nothing happens.
* @param[in] includeCached if true, glyphs already cached are traced again
* @param[in] cb optional callback methods called by the tracer
* @return number of glyphs traced */
int PhysicalFont::traceAllGlyphs (bool includeCached, GFGlyphTracer::Callback *cb) const {
int count = 0;
if (type() == MF && CACHE_PATH) {
if (const FontMetrics *metrics = getMetrics()) {
int fchar = metrics->firstChar();
int lchar = metrics->lastChar();
string gfname;
Glyph glyph;
if (createGF(gfname)) {
_cache.read(name().c_str(), CACHE_PATH);
double ds = getMetrics() ? getMetrics()->getDesignSize() : 1;
GFGlyphTracer tracer(gfname, unitsPerEm()/ds, cb);
tracer.setGlyph(glyph);
for (int i=fchar; i <= lchar; i++) {
if (includeCached || !_cache.getGlyph(i)) {
glyph.clear();
tracer.executeChar(i);
glyph.closeOpenSubPaths();
_cache.setGlyph(i, glyph);
++count;
}
}
_cache.write(CACHE_PATH);
}
}
}
return count;
}
/** Computes the exact bounding box of a glyph.
* @param[in] c character code of the glyph
* @param[out] bbox the computed bounding box
* @param[in] cb optional calback object forwarded to the tracer
* @return true if the box could be computed successfully */
bool PhysicalFont::getExactGlyphBox(int c, BoundingBox& bbox, GFGlyphTracer::Callback* cb) const {
Glyph glyph;
if (getGlyph(c, glyph, cb)) {
glyph.computeBBox(bbox);
double s = scaledSize()/unitsPerEm();
bbox.scale(s, s);
return true;
}
return false;
}
bool PhysicalFont::getExactGlyphBox (int c, GlyphMetrics &metrics, bool vertical, GFGlyphTracer::Callback *cb) const {
BoundingBox charbox;
if (!getExactGlyphBox(c, charbox, cb))
return false;
if ((metrics.wl = -charbox.minX()) < 0) metrics.wl=0;
if ((metrics.wr = charbox.maxX()) < 0) metrics.wr=0;
if ((metrics.h = charbox.maxY()) < 0) metrics.h=0;
if ((metrics.d = -charbox.minY()) < 0) metrics.d=0;
if (vertical) { // vertical text orientation
if (verticalLayout()) { // font designed for vertical layout?
metrics.wl = metrics.wr = (metrics.wl+metrics.wr)/2;
metrics.d += metrics.h;
metrics.h = 0;
}
else {
double depth = metrics.d;
metrics.d = metrics.wr;
metrics.wr = metrics.h;
metrics.h = metrics.wl;
metrics.wl = depth;
}
}
return true;
}
Font* VirtualFont::create (string name, UInt32 checksum, double dsize, double ssize) {
return new VirtualFontImpl(name, checksum, dsize, ssize);
}
//////////////////////////////////////////////////////////////////////////////
PhysicalFontImpl::PhysicalFontImpl (string name, int fontindex, UInt32 cs, double ds, double ss, PhysicalFont::Type type)
: TFMFont(name, cs, ds, ss),
_filetype(type), _fontIndex(fontindex), _fontMapEntry(Font::fontMapEntry()), _encodingPair(Font::encoding()), _localCharMap(0)
{
}
PhysicalFontImpl::~PhysicalFontImpl () {
if (CACHE_PATH)
_cache.write(CACHE_PATH);
if (!KEEP_TEMP_FILES)
tidy();
delete _localCharMap;
}
const FontEncoding* PhysicalFontImpl::encoding () const {
if (!_encodingPair.enc1())
return 0;
return &_encodingPair;
}
bool PhysicalFontImpl::findAndAssignBaseFontMap () {
const FontEncoding *enc = encoding();
if (enc && enc->mapsToCharIndex()) {
// try to find a base font map that maps from character indexes to a suitable
// target encoding supported by the font file
if (const FontEncoding *bfmap = enc->findCompatibleBaseFontMap(this, _charmapID))
_encodingPair.assign(bfmap);
else
return false;
}
else if (type() != MF) {
FontEngine::instance().setFont(*this);
if ((_localCharMap = FontEngine::instance().createCustomToUnicodeMap()) != 0)
_charmapID = FontEngine::instance().setCustomCharMap();
else
_charmapID = FontEngine::instance().setUnicodeCharMap();
}
return true;
}
/** Returns the Unicode point for a given DVI character. */
UInt32 PhysicalFontImpl::unicode (UInt32 c) const {
if (type() == MF)
return Font::unicode(c);
Character chr = decodeChar(c);
if (type() == PFB) {
// try to get the Unicode point from the character name
string glyphname = glyphName(c);
UInt32 codepoint;
if (!glyphname.empty() && (codepoint = Unicode::psNameToCodepoint(glyphname)) != 0)
return codepoint;
if (c <= 0x1900) // does character code c fit into Private Use Zone U+E000?
return 0xe000+c;
// Message::wstream() << "can't properly map PS character '" << glyphname << "' (0x" << hex << c << ") to Unicode\n";
// If we get here, there is no easy mapping. As for now, we use the character code as Unicode point.
// Although quite unlikely, it might collide with properly mapped characters.
return Unicode::charToCodepoint(c);
}
if (chr.type() == Character::NAME || chr.number() == 0)
return Unicode::charToCodepoint(chr.number());
if (_localCharMap) {
if (UInt32 mapped_char = _localCharMap->valueAt(chr.number()))
return mapped_char;
}
// No Unicode equivalent found in the font file.
// Now we should look for a smart alternative but at the moment
// it's sufficient to simply choose a valid unused codepoint.
return Unicode::charToCodepoint(chr.number());
}
/** Delete all temporary font files created by Metafont. */
void PhysicalFontImpl::tidy () const {
if (type() == MF) {
const char *ext[] = {"gf", "tfm", "log", 0};
for (const char **p=ext; *p; ++p) {
if (FileSystem::exists((name()+"."+(*p)).c_str()))
FileSystem::remove(name()+"."+(*p));
}
}
}
//////////////////////////////////////////////////////////////////////////////
string NativeFont::uniqueName (const string &path, const FontStyle &style) {
static map<string, int> ids;
ostringstream oss;
oss << path << "b" << style.bold << "e" << style.extend << "s" << style.slant;
map<string, int>::iterator it = ids.find(oss.str());
int id = ids.size();
if (it == ids.end())
ids[oss.str()] = id;
else
id = it->second;
oss.str("");
oss << "nf" << id;
return oss.str();
}
string NativeFont::name () const {
return uniqueName(path(), _style);
}
PhysicalFont::Type NativeFont::type () const {
if (const char *filepath = path()) {
if (const char *p =strrchr(filepath, '.')) {
string ext = p+1;
if (ext == "otf")
return PhysicalFont::OTF;
if (ext == "ttf")
return PhysicalFont::TTF;
if (ext == "pfb")
return PhysicalFont::PFB;
}
}
return PhysicalFont::UNKNOWN;
}
double NativeFont::charWidth (int c) const {
FontEngine::instance().setFont(*this);
int upem = FontEngine::instance().getUnitsPerEM();
double w = upem ? (scaledSize()*FontEngine::instance().getAdvance(c)/upem*_style.extend) : 0;
w += fabs(_style.slant*charHeight(c));
return w;
}
double NativeFont::charHeight (int c) const {
FontEngine::instance().setFont(*this);
int upem = FontEngine::instance().getUnitsPerEM();
return upem ? (scaledSize()*FontEngine::instance().getAscender()/upem) : 0;
}
double NativeFont::charDepth (int c) const {
FontEngine::instance().setFont(*this);
int upem = FontEngine::instance().getUnitsPerEM();
return upem ? (-scaledSize()*FontEngine::instance().getDescender()/upem) : 0;
}
bool NativeFontImpl::findAndAssignBaseFontMap () {
FontEngine &fe = FontEngine::instance();
fe.setFont(*this);
fe.setUnicodeCharMap();
fe.buildCharMap(_toUnicodeMap);
if (!_toUnicodeMap.addMissingMappings(fe.getNumGlyphs()))
Message::wstream(true) << "incomplete Unicode mapping for native font " << name() << " (" << filename() << ")\n";
return true;
}
Character NativeFontImpl::decodeChar (UInt32 c) const {
return Character(Character::INDEX, c);
}
UInt32 NativeFontImpl::unicode (UInt32 c) const {
UInt32 ucode = _toUnicodeMap.valueAt(c);
return Unicode::charToCodepoint(ucode);
}
//////////////////////////////////////////////////////////////////////////////
VirtualFontImpl::VirtualFontImpl (string name, UInt32 cs, double ds, double ss)
: TFMFont(name, cs, ds, ss)
{
}
VirtualFontImpl::~VirtualFontImpl () {
// delete dvi vectors received by VFReaderAction
for (map<UInt32, DVIVector*>::iterator i=_charDefs.begin(); i != _charDefs.end(); ++i)
delete i->second;
}
const char* VirtualFontImpl::path () const {
return FileFinder::lookup(name()+".vf");
}
void VirtualFontImpl::assignChar (UInt32 c, DVIVector *dvi) {
if (dvi) {
if (_charDefs.find(c) == _charDefs.end())
_charDefs[c] = dvi;
else
delete dvi;
}
}
const vector<UInt8>* VirtualFontImpl::getDVI (int c) const {
map<UInt32,DVIVector*>::const_iterator it = _charDefs.find(c);
return (it == _charDefs.end() ? 0 : it->second);
}
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