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/*************************************************************************
** PapersizeSpecialHandler.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2023 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 "Message.hpp"
#include "PapersizeSpecialHandler.hpp"
#include "SpecialActions.hpp"
using namespace std;
void PapersizeSpecialHandler::preprocess (const string&, std::istream &is, SpecialActions &actions) {
string params;
is >> params;
Length w, h;
const auto splitpos = params.find(',');
try {
if (splitpos == string::npos) {
w.set(params);
h.set(params);
}
else {
w.set(params.substr(0, splitpos));
h.set(params.substr(splitpos+1));
}
storePaperSize(actions.getCurrentPageNumber(), w, h);
}
catch (UnitException &e) { // ignore invalid length units for now
}
}
bool PapersizeSpecialHandler::process (const string&, std::istream&, SpecialActions&) {
return true;
}
/** Records a paper size for a given page number for later processing. This function doesn't
* assign them to the page. */
void PapersizeSpecialHandler::storePaperSize (unsigned pageno, Length width, Length height) {
DoublePair whpair(width.bp(), height.bp());
if (_pageSizes.empty() || _pageSizes.back().second != whpair) {
if (!_pageSizes.empty() && _pageSizes.back().first == pageno)
_pageSizes.back().second = whpair;
else
_pageSizes.emplace_back(pageno, whpair);
}
}
/** Applies the previously recorded size to a given page. */
void PapersizeSpecialHandler::applyPaperSize (unsigned pageno, SpecialActions &actions) {
// find page n >= pageno that contains a papersize special
auto lb_it = lower_bound(_pageSizes.begin(), _pageSizes.end(), PageSize(pageno, DoublePair()),
[](const PageSize &ps1, const PageSize &ps2) {
// order PageSize objects by page number
return ps1.first < ps2.first;
});
auto it = _pageSizes.end();
if (lb_it != _pageSizes.end() && lb_it->first == pageno)
it = lb_it; // if current page contains a papersize special, use it
else if (lb_it != _pageSizes.begin()) // no papersize special on current page?
it = lb_it-1; // => use the one on the nearest preceding page
if (it == _pageSizes.end())
Message::wstream(true) << "no valid papersize special found\n";
else {
DoublePair size = it->second;
const double border = -72; // DVI standard: coordinates of upper left paper corner are (-72bp, -72bp)
actions.bbox() = BoundingBox(border, border, size.first+border, size.second+border);
}
}
void PapersizeSpecialHandler::dviEndPage (unsigned pageno, SpecialActions &actions) {
if (actions.getBBoxFormatString() == "papersize")
applyPaperSize(pageno, actions);
}
vector<const char*> PapersizeSpecialHandler::prefixes () const {
vector<const char*> pfx {"papersize="};
return pfx;
}
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