1 /* 2 * Copyright (C) 2007,2008 Alex Shulgin 3 * 4 * This file is part of png++ the C++ wrapper for libpng. PNG++ is free 5 * software; the exact copying conditions are as follows: 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 23 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 25 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #ifndef PNGPP_GA_PIXEL_HPP_INCLUDED 32 #define PNGPP_GA_PIXEL_HPP_INCLUDED 33 34 #include <limits> 35 36 #include "types.hpp" 37 #include "pixel_traits.hpp" 38 39 namespace png 40 { 41 42 /** 43 * \brief Basic Gray+Alpha pixel type. 44 */ 45 template< typename T > 46 struct basic_ga_pixel 47 { 48 typedef pixel_traits< basic_ga_pixel< T > > traits; 49 50 /** 51 * \brief Constructs basic_ga_pixel object from \a value and 52 * \a alpha components passed as parameters. Alpha defaults 53 * to full opacity. 54 */ basic_ga_pixelpng::basic_ga_pixel55 basic_ga_pixel(T value = 0, T alpha = traits::get_alpha_filler()) 56 : value(value), alpha(alpha) 57 { 58 } 59 60 T value; 61 T alpha; 62 }; 63 64 /** 65 * \brief The 8-bit Gray+Alpha pixel type. 66 */ 67 typedef basic_ga_pixel< byte > ga_pixel; 68 69 /** 70 * \brief The 16-bit Gray+Alpha pixel type. 71 */ 72 typedef basic_ga_pixel< uint_16 > ga_pixel_16; 73 74 /** 75 * \brief Pixel traits specialization for basic_ga_pixel. 76 */ 77 template< typename T > 78 struct pixel_traits< basic_ga_pixel< T > > 79 : basic_pixel_traits< basic_ga_pixel< T >, T, color_type_ga >, 80 basic_alpha_pixel_traits< T > 81 { 82 }; 83 84 } // namespace png 85 86 #endif // PNGPP_GA_PIXEL_HPP_INCLUDED 87