1 /////////////////////////////////////////////////////////////////////////// 2 // 3 // Copyright (c) 2002, Industrial Light & Magic, a division of Lucas 4 // Digital Ltd. LLC 5 // 6 // All rights reserved. 7 // 8 // Redistribution and use in source and binary forms, with or without 9 // modification, are permitted provided that the following conditions are 10 // met: 11 // * Redistributions of source code must retain the above copyright 12 // notice, this list of conditions and the following disclaimer. 13 // * Redistributions in binary form must reproduce the above 14 // copyright notice, this list of conditions and the following disclaimer 15 // in the documentation and/or other materials provided with the 16 // distribution. 17 // * Neither the name of Industrial Light & Magic nor the names of 18 // its contributors may be used to endorse or promote products derived 19 // from this software without specific prior written permission. 20 // 21 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 // 33 /////////////////////////////////////////////////////////////////////////// 34 35 36 //---------------------------------------------------------------------------- 37 // 38 // Implementation of non-template items declared in ImathColorAlgo.h 39 // 40 //---------------------------------------------------------------------------- 41 42 #include "ImathColorAlgo.h" 43 44 namespace Imath { 45 46 47 Vec3<double> 48 hsv2rgb_d(const Vec3<double> &hsv) 49 { 50 double hue = hsv.x; 51 double sat = hsv.y; 52 double val = hsv.z; 53 54 double x = 0.0, y = 0.0, z = 0.0; 55 56 if (hue == 1) hue = 0; 57 else hue *= 6; 58 59 int i = int(Math<double>::floor(hue)); 60 double f = hue-i; 61 double p = val*(1-sat); 62 double q = val*(1-(sat*f)); 63 double t = val*(1-(sat*(1-f))); 64 65 switch (i) 66 { 67 case 0: x = val; y = t; z = p; break; 68 case 1: x = q; y = val; z = p; break; 69 case 2: x = p; y = val; z = t; break; 70 case 3: x = p; y = q; z = val; break; 71 case 4: x = t; y = p; z = val; break; 72 case 5: x = val; y = p; z = q; break; 73 } 74 75 return Vec3<double>(x,y,z); 76 } 77 78 79 Color4<double> 80 hsv2rgb_d(const Color4<double> &hsv) 81 { 82 double hue = hsv.r; 83 double sat = hsv.g; 84 double val = hsv.b; 85 86 double r = 0.0, g = 0.0, b = 0.0; 87 88 if (hue == 1) hue = 0; 89 else hue *= 6; 90 91 int i = int(Math<double>::floor(hue)); 92 double f = hue-i; 93 double p = val*(1-sat); 94 double q = val*(1-(sat*f)); 95 double t = val*(1-(sat*(1-f))); 96 97 switch (i) 98 { 99 case 0: r = val; g = t; b = p; break; 100 case 1: r = q; g = val; b = p; break; 101 case 2: r = p; g = val; b = t; break; 102 case 3: r = p; g = q; b = val; break; 103 case 4: r = t; g = p; b = val; break; 104 case 5: r = val; g = p; b = q; break; 105 } 106 107 return Color4<double>(r,g,b,hsv.a); 108 } 109 110 111 112 Vec3<double> 113 rgb2hsv_d(const Vec3<double> &c) 114 { 115 const double &x = c.x; 116 const double &y = c.y; 117 const double &z = c.z; 118 119 double max = (x > y) ? ((x > z) ? x : z) : ((y > z) ? y : z); 120 double min = (x < y) ? ((x < z) ? x : z) : ((y < z) ? y : z); 121 double range = max - min; 122 double val = max; 123 double sat = 0; 124 double hue = 0; 125 126 if (max != 0) sat = range/max; 127 128 if (sat != 0) 129 { 130 double h; 131 132 if (x == max) h = (y - z) / range; 133 else if (y == max) h = 2 + (z - x) / range; 134 else h = 4 + (x - y) / range; 135 136 hue = h/6.; 137 138 if (hue < 0.) 139 hue += 1.0; 140 } 141 return Vec3<double>(hue,sat,val); 142 } 143 144 145 Color4<double> 146 rgb2hsv_d(const Color4<double> &c) 147 { 148 const double &r = c.r; 149 const double &g = c.g; 150 const double &b = c.b; 151 152 double max = (r > g) ? ((r > b) ? r : b) : ((g > b) ? g : b); 153 double min = (r < g) ? ((r < b) ? r : b) : ((g < b) ? g : b); 154 double range = max - min; 155 double val = max; 156 double sat = 0; 157 double hue = 0; 158 159 if (max != 0) sat = range/max; 160 161 if (sat != 0) 162 { 163 double h; 164 165 if (r == max) h = (g - b) / range; 166 else if (g == max) h = 2 + (b - r) / range; 167 else h = 4 + (r - g) / range; 168 169 hue = h/6.; 170 171 if (hue < 0.) 172 hue += 1.0; 173 } 174 return Color4<double>(hue,sat,val,c.a); 175 } 176 177 178 } // namespace Imath 179
