diff options
author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
---|---|---|
committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/BgColorSpecialHandler.cpp |
Initial commit
Diffstat (limited to 'dviware/dvisvgm/src/BgColorSpecialHandler.cpp')
-rw-r--r-- | dviware/dvisvgm/src/BgColorSpecialHandler.cpp | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/BgColorSpecialHandler.cpp b/dviware/dvisvgm/src/BgColorSpecialHandler.cpp new file mode 100644 index 0000000000..10c05fca05 --- /dev/null +++ b/dviware/dvisvgm/src/BgColorSpecialHandler.cpp @@ -0,0 +1,68 @@ +/************************************************************************* +** BgColorSpecialHandler.cpp ** +** ** +** This file is part of dvisvgm -- a fast DVI to SVG converter ** +** Copyright (C) 2005-2019 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(PageColor(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; +} |