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Libs/png++/png++/ga_pixel.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_GA_PIXEL_HPP_INCLUDED
+#define PNGPP_GA_PIXEL_HPP_INCLUDED
+
+#include <limits>
+
+#include "types.hpp"
+#include "pixel_traits.hpp"
+
+namespace png
+{
+
+    /**
+     * \brief Basic Gray+Alpha pixel type.
+     */
+    template< typename T >
+    struct basic_ga_pixel
+    {
+        typedef pixel_traits< basic_ga_pixel< T > > traits;
+
+        /**
+         * \brief Constructs basic_ga_pixel object from \a value and
+         * \a alpha components passed as parameters.  Alpha defaults
+         * to full opacity.
+         */
+        basic_ga_pixel(T value = 0, T alpha = traits::get_alpha_filler())
+            : value(value), alpha(alpha)
+        {
+        }
+
+        T value;
+        T alpha;
+    };
+
+    /**
+     * \brief The 8-bit Gray+Alpha pixel type.
+     */
+    typedef basic_ga_pixel< byte > ga_pixel;
+
+    /**
+     * \brief The 16-bit Gray+Alpha pixel type.
+     */
+    typedef basic_ga_pixel< uint_16 > ga_pixel_16;
+
+    /**
+     * \brief Pixel traits specialization for basic_ga_pixel.
+     */
+    template< typename T >
+    struct pixel_traits< basic_ga_pixel< T > >
+        : basic_pixel_traits< basic_ga_pixel< T >, T, color_type_ga >,
+          basic_alpha_pixel_traits< T >
+    {
+    };
+
+} // namespace png
+
+#endif // PNGPP_GA_PIXEL_HPP_INCLUDED