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/*************************************************************************
** BgColorSpecialHandler.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 <algorithm>
#include "BgColorSpecialHandler.hpp"
#include "ColorSpecialHandler.hpp"
#include "SpecialActions.hpp"
using namespace std;
/** Collect all background color changes while preprocessing the DVI file.
* We need them in order to apply the correct background colors even if
* not all but only selected DVI pages are converted. */
void BgColorSpecialHandler::preprocess (const string&, std::istream &is, SpecialActions &actions) {
Color color = ColorSpecialHandler::readColor(is);
unsigned pageno = actions.getCurrentPageNumber();
if (_pageColors.empty() || _pageColors.back().second != color) {
if (!_pageColors.empty() && _pageColors.back().first == pageno)
_pageColors.back().second = color;
else
_pageColors.emplace_back(pageno, color);
}
}
bool BgColorSpecialHandler::process (const string&, istream&, SpecialActions&) {
return true;
}
void BgColorSpecialHandler::dviBeginPage (unsigned pageno, SpecialActions &actions) {
// Ensure that the background color of the preceeding page is set as the
// default background color of the current page because this special affects
// the current and all subsequent pages until the next change.
// See the documentation of the color package, section 3.5.
if (_pageColors.empty())
return;
// find number of page with bg color change not lower than the current one
auto it = lower_bound(_pageColors.begin(), _pageColors.end(), PageColor(pageno, Color::BLACK));
if (it != _pageColors.end() && it->first == pageno)
actions.setBgColor(it->second);
else if (it != _pageColors.begin())
actions.setBgColor((--it)->second);
}
vector<const char*> BgColorSpecialHandler::prefixes () const {
vector<const char*> pfx {"background"};
return pfx;
}
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