1 files changed, 59 insertions, 0 deletions
diff --git a/libdimensionxx/dimensionxx/png.hpp b/libdimensionxx/dimensionxx/png.hpp
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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 */