00001 /* 00002 * Copyright (C) 2007,2008 Alex Shulgin 00003 * 00004 * This file is part of png++ the C++ wrapper for libpng. PNG++ is free 00005 * software; the exact copying conditions are as follows: 00006 * 00007 * Redistribution and use in source and binary forms, with or without 00008 * modification, are permitted provided that the following conditions are met: 00009 * 00010 * 1. Redistributions of source code must retain the above copyright notice, 00011 * this list of conditions and the following disclaimer. 00012 * 00013 * 2. Redistributions in binary form must reproduce the above copyright 00014 * notice, this list of conditions and the following disclaimer in the 00015 * documentation and/or other materials provided with the distribution. 00016 * 00017 * 3. The name of the author may not be used to endorse or promote products 00018 * derived from this software without specific prior written permission. 00019 * 00020 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 00021 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00022 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 00023 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00024 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00025 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00026 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00027 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00028 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00029 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00030 */ 00031 #ifndef PNGPP_PIXEL_TRAITS_HPP_INCLUDED 00032 #define PNGPP_PIXEL_TRAITS_HPP_INCLUDED 00033 00034 #include <limits> 00035 #include "types.hpp" 00036 00037 namespace png 00038 { 00039 00048 template< typename pixel > struct pixel_traits; 00049 00056 template< typename pixel, 00057 typename component, 00058 color_type pixel_color_type, 00059 size_t channels = sizeof(pixel) / sizeof(component), 00060 size_t bit_depth = std::numeric_limits< component >::digits > 00061 struct basic_pixel_traits 00062 { 00063 typedef pixel pixel_type; 00064 typedef component component_type; 00065 00066 static color_type get_color_type() 00067 { 00068 return pixel_color_type; 00069 } 00070 static size_t get_channels() 00071 { 00072 return channels; 00073 } 00074 static size_t get_bit_depth() 00075 { 00076 return bit_depth; 00077 } 00078 }; 00079 00084 template< typename component > 00085 struct basic_alpha_pixel_traits 00086 { 00091 static component get_alpha_filler() 00092 { 00093 return std::numeric_limits< component >::max(); 00094 } 00095 }; 00096 00097 } // namespace png 00098 00099 #endif // PNGPP_PIXEL_TRAITS_HPP_INCLUDED
1.7.1