00001 /* 00002 Copyright (c) 2010, The Barbarian Group 00003 All rights reserved. 00004 00005 Redistribution and use in source and binary forms, with or without modification, are permitted provided that 00006 the following conditions are met: 00007 00008 * Redistributions of source code must retain the above copyright notice, this list of conditions and 00009 the following disclaimer. 00010 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and 00011 the following disclaimer in the documentation and/or other materials provided with the distribution. 00012 00013 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED 00014 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 00015 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 00016 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00017 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00018 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00019 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00020 POSSIBILITY OF SUCH DAMAGE. 00021 */ 00022 00023 #pragma once 00024 00025 #include "cinder/Cinder.h" 00026 00027 #include <boost/preprocessor/seq.hpp> 00028 00029 namespace cinder { 00030 00031 template<typename T> 00032 struct CHANTRAIT 00033 { 00034 }; 00035 00036 template<> 00037 struct CHANTRAIT<uint8_t> 00038 { 00039 typedef uint32_t Sum; 00040 typedef uint32_t Accum; 00041 typedef int32_t SignedSum; 00042 static uint8_t max() { return 255; } 00043 static uint8_t convert( uint8_t v ) { return v; } 00044 static uint8_t convert( uint16_t v ) { return v / 257; } 00045 static uint8_t convert( float v ) { return static_cast<uint8_t>( v * 255 ); } 00046 static uint8_t grayscale( uint8_t r, uint8_t g, uint8_t b ) { return ( r * 74 + g * 147 + b * 35 ) >> 8; } 00048 static uint8_t premultiply( uint8_t c, uint8_t a ) { return c * 255 / a; } // TODO: need Jim Blinn's optimized trick here 00049 }; 00050 00051 template<> 00052 struct CHANTRAIT<uint16_t> 00053 { 00054 typedef uint32_t Sum; 00055 typedef uint32_t Accum; 00056 typedef int32_t SignedSum; 00057 static uint16_t max() { return 65535; } 00058 static uint16_t convert( uint8_t v ) { return ( v << 8 ) | v; } 00059 static uint16_t convert( uint16_t v ) { return v; } 00060 static uint16_t convert( float v ) { return static_cast<uint16_t>( v * 65535 ); } 00061 static uint16_t grayscale( uint16_t r, uint16_t g, uint16_t b ) { return ( r * 9511 + g * 18674 + b * 4582 ) >> 15; } 00062 }; 00063 00064 template<> 00065 struct CHANTRAIT<float> 00066 { 00067 typedef float Sum; 00068 typedef float Accum; 00069 typedef float SignedSum; 00070 static float max() { return 1.0f; } 00071 static float convert( uint8_t v ) { return v / 255.0f; } 00072 static float convert( uint16_t v ) { return v / 65535.0f; } 00073 static float convert( float v ) { return v; } 00074 static float grayscale( float r, float g, float b ) { return r * 0.212f + g * 0.701f + b * 0.087f; } 00076 static float premultiply( float c, float a ) { return c * a; } 00077 }; 00078 00079 #define CHANNEL_TYPES (uint8_t)(float) 00080 00081 } // namespace cinder