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/*************************************************************************
** ImageToSVG.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2024 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 <fstream>
#include <sstream>
#include "Calculator.hpp"
#include "DvisvgmSpecialHandler.hpp"
#include "ImageToSVG.hpp"
#include "Message.hpp"
#include "MessageException.hpp"
#include "PageRanges.hpp"
#include "PsSpecialHandler.hpp"
#include "optimizer/SVGOptimizer.hpp"
#include "SVGOutput.hpp"
#include "System.hpp"
#include "utility.hpp"
#include "version.hpp"
using namespace std;
ImageToSVG::ImageToSVG (std::string fname, SVGOutputBase &out)
: _fname(std::move(fname)), _out(out), _gsVersion(Ghostscript().revision())
{
}
void ImageToSVG::checkGSAndFileFormat () {
if (!_gsVersion)
throw MessageException("Ghostscript is required to process "+imageFormat()+" files");
if (!imageIsValid())
throw MessageException("invalid "+imageFormat()+" file");
}
void ImageToSVG::convert (int pageno) {
checkGSAndFileFormat();
BoundingBox bbox = imageBBox();
if (bbox.valid() && (bbox.width() == 0 || bbox.height() == 0))
Message::wstream(true) << "bounding box of " << imageFormat() << " file is empty\n";
Message::mstream().indent(0);
Message::mstream(false, Message::MC_PAGE_NUMBER) << "processing " << imageFormat() << " file\n";
Message::mstream().indent(1);
_svg.newPage(pageno);
// create a psfile special and forward it to the PsSpecialHandler
stringstream ss;
ss << "\"" << _fname << "\" "
"llx=" << bbox.minX() << " "
"lly=" << bbox.minY() << " "
"urx=" << bbox.maxX() << " "
"ury=" << bbox.maxY();
_currentPageNumber = pageno;
if (!isSinglePageFormat())
ss << " page=" << pageno << " proc=gs";
try {
_psHandler.process(psSpecialCmd(), ss, *this);
}
catch (...) {
progress(nullptr); // remove progress message
throw;
}
writeSVG(pageno);
}
void ImageToSVG::writeSVG (int pageno) {
progress(nullptr);
Matrix matrix = getUserMatrix(_bbox);
// output SVG file
SVGOptimizer(_svg).execute();
_svg.transformPage(matrix);
_bbox.transform(matrix);
_svg.setBBox(_bbox);
_svg.appendToDoc(util::make_unique<XMLComment>(" This file was generated by dvisvgm " + string(PROGRAM_VERSION) + " "));
bool success = _svg.write(_out.getPageStream(pageno, totalPageCount()));
string svgfname = _out.filepath(pageno, totalPageCount()).shorterAbsoluteOrRelative();
_out.finish();
if (svgfname.empty())
svgfname = "<stdout>";
if (!success)
Message::wstream() << "failed to write output to " << svgfname << '\n';
else {
const double bp2pt = 72.27/72;
const double bp2mm = 25.4/72;
Message::mstream(false,Message::MC_PAGE_SIZE)
<< "graphic size: " << XMLString(_bbox.width()*bp2pt) << "pt"
<< " x " << XMLString(_bbox.height()*bp2pt) << "pt"
<< " (" << XMLString(_bbox.width()*bp2mm) << "mm"
<< " x " << XMLString(_bbox.height()*bp2mm) << "mm)\n";
Message::mstream(false, Message::MC_PAGE_WRITTEN) << "output written to " << svgfname << '\n';
if (!_userMessage.empty()) {
string msg = expandText(_userMessage);
Message::ustream(true) << msg << "\n";
}
}
_bbox.invalidate();
_svg.reset();
}
void ImageToSVG::convert (int firstPage, int lastPage, pair<int,int> *pageinfo) {
checkGSAndFileFormat();
int pageCount = 1; // number of pages converted
if (isSinglePageFormat())
convert(1);
else {
if (firstPage > lastPage)
swap(firstPage, lastPage);
firstPage = max(1, firstPage);
if (firstPage > totalPageCount())
pageCount = 0;
else {
lastPage = min(totalPageCount(), lastPage);
pageCount = lastPage-firstPage+1;
for (int i=firstPage; i <= lastPage; i++)
convert(i);
}
}
if (pageinfo) {
pageinfo->first = pageCount;
pageinfo->second = totalPageCount();
}
}
void ImageToSVG::convert (const std::string &rangestr, pair<int,int> *pageinfo) {
checkGSAndFileFormat();
PageRanges ranges;
if (!ranges.parse(rangestr, totalPageCount()))
throw MessageException("invalid page range format");
int pageCount=0; // number of pages converted
for (const auto &range : ranges) {
convert(range.first, range.second, pageinfo);
if (pageinfo)
pageCount += pageinfo->first;
}
if (pageinfo)
pageinfo->first = pageCount;
}
FilePath ImageToSVG::getSVGFilePath (unsigned pageno) const {
FilePath path;
unsigned numPages = totalPageCount();
if (pageno >= 1 && pageno <= numPages)
path = _out.filepath(pageno, numPages);
return path;
}
void ImageToSVG::progress (const char *id) {
static double time=System::time();
static bool draw=false; // show progress indicator?
static size_t count=0;
count++;
// don't show the progress indicator before the given time has elapsed
if (!draw && System::time()-time > PROGRESSBAR_DELAY) {
draw = true;
Terminal::cursor(false);
Message::mstream(false) << "\n";
}
if (draw && ((System::time() - time > 0.05) || id == nullptr)) {
const size_t DIGITS=6;
Message::mstream(false, Message::MC_PROGRESS)
<< string(DIGITS-min(DIGITS, static_cast<size_t>(log10(count))), ' ')
<< count << " PostScript instructions processed\r";
// overprint indicator when finished
if (id == nullptr) {
Message::estream().clearline();
Terminal::cursor(true);
}
time = System::time();
}
}
/** Returns the matrix describing the graphics transformations
* given by the user in terms of transformation commands.
* @param[in] bbox bounding box of the graphics to transform */
Matrix ImageToSVG::getUserMatrix (const BoundingBox &bbox) const {
Matrix matrix(1);
if (!_transCmds.empty()) {
const double bp2pt = (1_bp).pt();
Calculator calc;
calc.setVariable("ux", bbox.minX()*bp2pt);
calc.setVariable("uy", bbox.minY()*bp2pt);
calc.setVariable("w", bbox.width()*bp2pt);
calc.setVariable("h", bbox.height()*bp2pt);
// add constants for length units to calculator
for (const auto &unit : Length::getUnits())
calc.setVariable(unit.first, Length(1, unit.second).pt());
matrix.set(_transCmds, calc);
}
return matrix;
}
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