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+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
+ * *
+ * This file is part of The Dimension Library. *
+ * *
+ * The Dimension Library is free software; you can redistribute it and/ *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version. *
+ * *
+ * The Dimension Library 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 *
+ * Lesser General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU Lesser General Public *
+ * License along with this program. If not, see *
+ * <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+#ifndef DIMENSIONXX_PNG_HPP
+#define DIMENSIONXX_PNG_HPP
+
+#include <istream>
+#include <ostream>
+
+namespace Dimension
+{
+ class PNG_Canvas : public Canvas
+ {
+ public:
+ explicit PNG_Canvas(std::istream& istr)
+ : Canvas(), m_istr(&istr), m_ostr(0), m_written(false) { read(); }
+ PNG_Canvas(unsigned int x, unsigned int y, std::ostream& ostr)
+ : Canvas(x, y), m_istr(0), m_ostr(&ostr), m_written(false) { }
+ PNG_Canvas(std::istream& istr, std::ostream& ostr)
+ : Canvas(), m_istr(&istr), m_ostr(&ostr), m_written(false) { read(); }
+ virtual ~PNG_Canvas();
+
+ void write();
+
+ protected:
+ PNG_Canvas(std::ostream* ostr)
+ : Canvas(), m_istr(0), m_ostr(ostr), m_written(false) { }
+
+ private:
+ std::istream* m_istr;
+ std::ostream* m_ostr;
+ bool m_written;
+
+ void read();
+
+ // Copying prohibited
+ PNG_Canvas(const PNG_Canvas&);
+ PNG_Canvas& operator=(const PNG_Canvas&);
+ };
+}
+
+#endif /* DIMENSIONXX_PNG_HPP */