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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