[855] | 1 | /////////////////////////////////////////////////////////////////////////// |
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| 2 | // |
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| 3 | // Copyright (c) 2002, Industrial Light & Magic, a division of Lucas |
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| 4 | // Digital Ltd. LLC |
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| 5 | // |
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| 6 | // All rights reserved. |
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| 7 | // |
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| 8 | // Redistribution and use in source and binary forms, with or without |
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| 9 | // modification, are permitted provided that the following conditions are |
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| 10 | // met: |
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| 11 | // * Redistributions of source code must retain the above copyright |
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| 12 | // notice, this list of conditions and the following disclaimer. |
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| 13 | // * Redistributions in binary form must reproduce the above |
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| 14 | // copyright notice, this list of conditions and the following disclaimer |
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| 15 | // in the documentation and/or other materials provided with the |
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| 16 | // distribution. |
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| 17 | // * Neither the name of Industrial Light & Magic nor the names of |
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| 18 | // its contributors may be used to endorse or promote products derived |
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| 19 | // from this software without specific prior written permission. |
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| 20 | // |
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| 21 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 22 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 23 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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| 24 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| 25 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 26 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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| 27 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 28 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 29 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 30 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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| 31 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 32 | // |
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| 33 | /////////////////////////////////////////////////////////////////////////// |
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| 34 | |
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| 35 | |
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| 36 | |
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| 37 | #ifndef INCLUDED_IMATHCOLORALGO_H |
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| 38 | #define INCLUDED_IMATHCOLORALGO_H |
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| 39 | |
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| 40 | |
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| 41 | #include <ImathColor.h> |
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| 42 | #include <ImathMath.h> |
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| 43 | #include <ImathLimits.h> |
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| 44 | |
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| 45 | namespace Imath { |
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| 46 | |
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| 47 | |
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| 48 | // |
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| 49 | // Non-templated helper routines for color conversion. |
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| 50 | // These routines eliminate type warnings under g++. |
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| 51 | // |
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| 52 | |
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| 53 | Vec3<double> hsv2rgb_d(const Vec3<double> &hsv); |
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| 54 | |
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| 55 | Color4<double> hsv2rgb_d(const Color4<double> &hsv); |
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| 56 | |
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| 57 | |
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| 58 | Vec3<double> rgb2hsv_d(const Vec3<double> &rgb); |
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| 59 | |
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| 60 | Color4<double> rgb2hsv_d(const Color4<double> &rgb); |
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| 61 | |
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| 62 | |
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| 63 | // |
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| 64 | // Color conversion functions and general color algorithms |
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| 65 | // |
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| 66 | // hsv2rgb(), rgb2hsv(), rgb2packed(), packed2rgb() |
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| 67 | // see each funtion definition for details. |
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| 68 | // |
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| 69 | |
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| 70 | template<class T> |
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| 71 | Vec3<T> |
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| 72 | hsv2rgb(const Vec3<T> &hsv) |
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| 73 | { |
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| 74 | if ( limits<T>::isIntegral() ) |
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| 75 | { |
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| 76 | Vec3<double> v = Vec3<double>(hsv.x / double(limits<T>::max()), |
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| 77 | hsv.y / double(limits<T>::max()), |
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| 78 | hsv.z / double(limits<T>::max())); |
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| 79 | Vec3<double> c = hsv2rgb_d(v); |
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| 80 | return Vec3<T>((T) (c.x * limits<T>::max()), |
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| 81 | (T) (c.y * limits<T>::max()), |
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| 82 | (T) (c.z * limits<T>::max())); |
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| 83 | } |
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| 84 | else |
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| 85 | { |
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| 86 | Vec3<double> v = Vec3<double>(hsv.x, hsv.y, hsv.z); |
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| 87 | Vec3<double> c = hsv2rgb_d(v); |
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| 88 | return Vec3<T>((T) c.x, (T) c.y, (T) c.z); |
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| 89 | } |
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| 90 | } |
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| 91 | |
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| 92 | |
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| 93 | template<class T> |
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| 94 | Color4<T> |
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| 95 | hsv2rgb(const Color4<T> &hsv) |
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| 96 | { |
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| 97 | if ( limits<T>::isIntegral() ) |
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| 98 | { |
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| 99 | Color4<double> v = Color4<double>(hsv.r / float(limits<T>::max()), |
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| 100 | hsv.g / float(limits<T>::max()), |
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| 101 | hsv.b / float(limits<T>::max()), |
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| 102 | hsv.a / float(limits<T>::max())); |
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| 103 | Color4<double> c = hsv2rgb_d(v); |
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| 104 | return Color4<T>((T) (c.r * limits<T>::max()), |
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| 105 | (T) (c.g * limits<T>::max()), |
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| 106 | (T) (c.b * limits<T>::max()), |
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| 107 | (T) (c.a * limits<T>::max())); |
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| 108 | } |
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| 109 | else |
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| 110 | { |
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| 111 | Color4<double> v = Color4<double>(hsv.r, hsv.g, hsv.g, hsv.a); |
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| 112 | Color4<double> c = hsv2rgb_d(v); |
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| 113 | return Color4<T>((T) c.r, (T) c.g, (T) c.b, (T) c.a); |
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| 114 | } |
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| 115 | } |
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| 116 | |
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| 117 | |
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| 118 | template<class T> |
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| 119 | Vec3<T> |
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| 120 | rgb2hsv(const Vec3<T> &rgb) |
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| 121 | { |
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| 122 | if ( limits<T>::isIntegral() ) |
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| 123 | { |
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| 124 | Vec3<double> v = Vec3<double>(rgb.x / double(limits<T>::max()), |
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| 125 | rgb.y / double(limits<T>::max()), |
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| 126 | rgb.z / double(limits<T>::max())); |
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| 127 | Vec3<double> c = rgb2hsv_d(v); |
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| 128 | return Vec3<T>((T) (c.x * limits<T>::max()), |
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| 129 | (T) (c.y * limits<T>::max()), |
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| 130 | (T) (c.z * limits<T>::max())); |
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| 131 | } |
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| 132 | else |
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| 133 | { |
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| 134 | Vec3<double> v = Vec3<double>(rgb.x, rgb.y, rgb.z); |
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| 135 | Vec3<double> c = rgb2hsv_d(v); |
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| 136 | return Vec3<T>((T) c.x, (T) c.y, (T) c.z); |
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| 137 | } |
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| 138 | } |
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| 139 | |
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| 140 | |
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| 141 | template<class T> |
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| 142 | Color4<T> |
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| 143 | rgb2hsv(const Color4<T> &rgb) |
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| 144 | { |
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| 145 | if ( limits<T>::isIntegral() ) |
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| 146 | { |
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| 147 | Color4<double> v = Color4<double>(rgb.r / float(limits<T>::max()), |
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| 148 | rgb.g / float(limits<T>::max()), |
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| 149 | rgb.b / float(limits<T>::max()), |
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| 150 | rgb.a / float(limits<T>::max())); |
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| 151 | Color4<double> c = rgb2hsv_d(v); |
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| 152 | return Color4<T>((T) (c.r * limits<T>::max()), |
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| 153 | (T) (c.g * limits<T>::max()), |
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| 154 | (T) (c.b * limits<T>::max()), |
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| 155 | (T) (c.a * limits<T>::max())); |
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| 156 | } |
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| 157 | else |
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| 158 | { |
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| 159 | Color4<double> v = Color4<double>(rgb.r, rgb.g, rgb.g, rgb.a); |
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| 160 | Color4<double> c = rgb2hsv_d(v); |
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| 161 | return Color4<T>((T) c.r, (T) c.g, (T) c.b, (T) c.a); |
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| 162 | } |
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| 163 | } |
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| 164 | |
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| 165 | template <class T> |
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| 166 | PackedColor |
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| 167 | rgb2packed(const Vec3<T> &c) |
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| 168 | { |
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| 169 | if ( limits<T>::isIntegral() ) |
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| 170 | { |
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| 171 | float x = c.x / float(limits<T>::max()); |
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| 172 | float y = c.y / float(limits<T>::max()); |
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| 173 | float z = c.z / float(limits<T>::max()); |
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| 174 | return rgb2packed( V3f(x,y,z) ); |
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| 175 | } |
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| 176 | else |
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| 177 | { |
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| 178 | return ( (PackedColor) (c.x * 255) | |
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| 179 | (((PackedColor) (c.y * 255)) << 8) | |
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| 180 | (((PackedColor) (c.z * 255)) << 16) | 0xFF000000 ); |
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| 181 | } |
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| 182 | } |
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| 183 | |
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| 184 | template <class T> |
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| 185 | PackedColor |
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| 186 | rgb2packed(const Color4<T> &c) |
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| 187 | { |
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| 188 | if ( limits<T>::isIntegral() ) |
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| 189 | { |
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| 190 | float r = c.r / float(limits<T>::max()); |
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| 191 | float g = c.g / float(limits<T>::max()); |
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| 192 | float b = c.b / float(limits<T>::max()); |
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| 193 | float a = c.a / float(limits<T>::max()); |
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| 194 | return rgb2packed( C4f(r,g,b,a) ); |
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| 195 | } |
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| 196 | else |
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| 197 | { |
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| 198 | return ( (PackedColor) (c.r * 255) | |
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| 199 | (((PackedColor) (c.g * 255)) << 8) | |
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| 200 | (((PackedColor) (c.b * 255)) << 16) | |
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| 201 | (((PackedColor) (c.a * 255)) << 24)); |
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| 202 | } |
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| 203 | } |
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| 204 | |
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| 205 | // |
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| 206 | // This guy can't return the result because the template |
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| 207 | // parameter would not be in the function signiture. So instead, |
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| 208 | // its passed in as an argument. |
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| 209 | // |
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| 210 | |
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| 211 | template <class T> |
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| 212 | void |
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| 213 | packed2rgb(PackedColor packed, Vec3<T> &out) |
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| 214 | { |
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| 215 | if ( limits<T>::isIntegral() ) |
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| 216 | { |
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| 217 | T f = limits<T>::max() / ((PackedColor)0xFF); |
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| 218 | out.x = (packed & 0xFF) * f; |
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| 219 | out.y = ((packed & 0xFF00) >> 8) * f; |
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| 220 | out.z = ((packed & 0xFF0000) >> 16) * f; |
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| 221 | } |
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| 222 | else |
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| 223 | { |
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| 224 | T f = T(1) / T(255); |
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| 225 | out.x = (packed & 0xFF) * f; |
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| 226 | out.y = ((packed & 0xFF00) >> 8) * f; |
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| 227 | out.z = ((packed & 0xFF0000) >> 16) * f; |
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| 228 | } |
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| 229 | } |
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| 230 | |
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| 231 | template <class T> |
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| 232 | void |
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| 233 | packed2rgb(PackedColor packed, Color4<T> &out) |
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| 234 | { |
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| 235 | if ( limits<T>::isIntegral() ) |
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| 236 | { |
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| 237 | T f = limits<T>::max() / ((PackedColor)0xFF); |
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| 238 | out.r = (packed & 0xFF) * f; |
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| 239 | out.g = ((packed & 0xFF00) >> 8) * f; |
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| 240 | out.b = ((packed & 0xFF0000) >> 16) * f; |
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| 241 | out.a = ((packed & 0xFF000000) >> 24) * f; |
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| 242 | } |
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| 243 | else |
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| 244 | { |
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| 245 | T f = T(1) / T(255); |
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| 246 | out.r = (packed & 0xFF) * f; |
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| 247 | out.g = ((packed & 0xFF00) >> 8) * f; |
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| 248 | out.b = ((packed & 0xFF0000) >> 16) * f; |
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| 249 | out.a = ((packed & 0xFF000000) >> 24) * f; |
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| 250 | } |
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| 251 | } |
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| 252 | |
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| 253 | |
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| 254 | } // namespace Imath |
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| 255 | |
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| 256 | #endif |
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