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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/BgColorSpecialHandler.cpp
Initial commit
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diff --git a/dviware/dvisvgm/src/BgColorSpecialHandler.cpp b/dviware/dvisvgm/src/BgColorSpecialHandler.cpp
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+/*************************************************************************
+** 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;
+}