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Libs/png++/png++/streaming_base.hpp

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+/*
+ * Copyright (C) 2007,2008   Alex Shulgin
+ *
+ * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
+ * software; the exact copying conditions are as follows:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef PNGPP_STREAMING_BASE_HPP_INCLUDED
+#define PNGPP_STREAMING_BASE_HPP_INCLUDED
+
+#include <cassert>
+#include "image_info.hpp"
+#include "pixel_traits.hpp"
+
+namespace png
+{
+
+    /**
+     * \brief The default image_info holder class.  Stores image_info
+     * member object.
+     */
+    class def_image_info_holder
+    {
+    public:
+        def_image_info_holder(image_info const& info)
+            : m_info(info)
+        {
+        }
+
+        image_info& get_info()
+        {
+            return m_info;
+        }
+
+    private:
+        image_info m_info;
+    };
+
+    /**
+     * \brief An image_info holder class.  Stores a reference to the
+     * image_info object.  The image_info object itself should be
+     * stored elsewhere.
+     */
+    class image_info_ref_holder
+    {
+    public:
+        image_info_ref_holder(image_info& info)
+            : m_info(info)
+        {
+        }
+
+        image_info& get_info()
+        {
+            return m_info;
+        }
+
+    private:
+        image_info& m_info;
+    };
+
+    /**
+     * \brief A base class template for consumer and generator
+     * classes.  Provides default \c reset() method implementation as
+     * well as \c info_holder policy.
+     */
+    template< typename pixel, class info_holder >
+    class streaming_base
+    {
+    public:
+        typedef pixel_traits< pixel > traits;
+
+        explicit streaming_base(image_info& info)
+            : m_info_holder(info)
+        {
+        }
+
+        streaming_base(uint_32 width, uint_32 height)
+            : m_info_holder(make_image_info< pixel >())
+        {
+            get_info().set_width(width);
+            get_info().set_height(height);
+        }
+
+        image_info const& get_info() const
+        {
+            return m_info_holder.get_info();
+        }
+
+    protected:
+        void reset(size_t /*pass*/)
+        {
+            // nothing to do in the most general case
+        }
+
+        image_info& get_info()
+        {
+            return m_info_holder.get_info();
+        }
+
+        info_holder m_info_holder;
+    };
+
+} // namespace png
+
+#endif // PNGPP_STREAMING_BASE_HPP_INCLUDED