1 | /* |
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2 | ----------------------------------------------------------------------------- |
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3 | This source file is part of OGRE |
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4 | (Object-oriented Graphics Rendering Engine) |
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5 | For the latest info, see http://www.ogre3d.org/ |
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6 | |
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7 | Copyright (c) 2000-2006 Torus Knot Software Ltd |
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8 | Also see acknowledgements in Readme.html |
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9 | |
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10 | This program is free software; you can redistribute it and/or modify it under |
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11 | the terms of the GNU Lesser General Public License as published by the Free Software |
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12 | Foundation; either version 2 of the License, or (at your option) any later |
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13 | version. |
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14 | |
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15 | This program is distributed in the hope that it will be useful, but WITHOUT |
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16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. |
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18 | |
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19 | You should have received a copy of the GNU Lesser General Public License along with |
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20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
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21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to |
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22 | http://www.gnu.org/copyleft/lesser.txt. |
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23 | |
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24 | You may alternatively use this source under the terms of a specific version of |
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25 | the OGRE Unrestricted License provided you have obtained such a license from |
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26 | Torus Knot Software Ltd. |
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27 | ----------------------------------------------------------------------------- |
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28 | */ |
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29 | #ifndef _COLOURVALUE_H__ |
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30 | #define _COLOURVALUE_H__ |
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31 | |
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32 | #include "OgrePrerequisites.h" |
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33 | |
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34 | #include <cassert> |
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35 | #include <ostream> |
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36 | |
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37 | namespace Ogre { |
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38 | |
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39 | typedef uint32 RGBA; |
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40 | typedef uint32 ARGB; |
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41 | typedef uint32 ABGR; |
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42 | typedef uint32 BGRA; |
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43 | |
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44 | /** Class representing colour. |
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45 | @remarks |
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46 | Colour is represented as 4 components, each of which is a |
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47 | floating-point value from 0.0 to 1.0. |
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48 | @par |
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49 | The 3 'normal' colour components are red, green and blue, a higher |
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50 | number indicating greater amounts of that component in the colour. |
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51 | The forth component is the 'alpha' value, which represents |
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52 | transparency. In this case, 0.0 is completely transparent and 1.0 is |
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53 | fully opaque. |
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54 | */ |
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55 | class _OgreExport ColourValue |
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56 | { |
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57 | public: |
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58 | static const ColourValue ZERO; |
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59 | static const ColourValue Black; |
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60 | static const ColourValue White; |
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61 | static const ColourValue Red; |
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62 | static const ColourValue Green; |
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63 | static const ColourValue Blue; |
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64 | |
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65 | explicit ColourValue( float red = 1.0f, |
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66 | float green = 1.0f, |
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67 | float blue = 1.0f, |
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68 | float alpha = 1.0f ) : r(red), g(green), b(blue), a(alpha) |
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69 | { } |
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70 | |
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71 | bool operator==(const ColourValue& rhs) const; |
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72 | bool operator!=(const ColourValue& rhs) const; |
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73 | |
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74 | float r,g,b,a; |
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75 | |
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76 | /** Retrieves colour as RGBA. |
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77 | */ |
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78 | RGBA getAsRGBA(void) const; |
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79 | |
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80 | /** Retrieves colour as ARGB. |
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81 | */ |
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82 | ARGB getAsARGB(void) const; |
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83 | |
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84 | /** Retrieves colour as BGRA. |
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85 | */ |
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86 | BGRA getAsBGRA(void) const; |
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87 | |
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88 | /** Retrieves colours as ABGR */ |
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89 | ABGR getAsABGR(void) const; |
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90 | |
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91 | /** Sets colour as RGBA. |
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92 | */ |
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93 | void setAsRGBA(const RGBA val); |
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94 | |
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95 | /** Sets colour as ARGB. |
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96 | */ |
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97 | void setAsARGB(const ARGB val); |
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98 | |
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99 | /** Sets colour as BGRA. |
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100 | */ |
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101 | void setAsBGRA(const BGRA val); |
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102 | |
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103 | /** Sets colour as ABGR. |
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104 | */ |
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105 | void setAsABGR(const ABGR val); |
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106 | |
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107 | /** Clamps colour value to the range [0, 1]. |
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108 | */ |
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109 | void saturate(void) |
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110 | { |
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111 | if (r < 0) |
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112 | r = 0; |
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113 | else if (r > 1) |
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114 | r = 1; |
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115 | |
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116 | if (g < 0) |
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117 | g = 0; |
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118 | else if (g > 1) |
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119 | g = 1; |
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120 | |
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121 | if (b < 0) |
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122 | b = 0; |
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123 | else if (b > 1) |
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124 | b = 1; |
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125 | |
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126 | if (a < 0) |
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127 | a = 0; |
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128 | else if (a > 1) |
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129 | a = 1; |
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130 | } |
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131 | |
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132 | /** As saturate, except that this colour value is unaffected and |
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133 | the saturated colour value is returned as a copy. */ |
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134 | ColourValue saturateCopy(void) const |
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135 | { |
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136 | ColourValue ret = *this; |
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137 | ret.saturate(); |
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138 | return ret; |
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139 | } |
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140 | |
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141 | /// Array accessor operator |
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142 | inline float operator [] ( const size_t i ) const |
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143 | { |
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144 | assert( i < 4 ); |
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145 | |
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146 | return *(&r+i); |
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147 | } |
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148 | |
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149 | /// Array accessor operator |
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150 | inline float& operator [] ( const size_t i ) |
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151 | { |
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152 | assert( i < 4 ); |
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153 | |
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154 | return *(&r+i); |
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155 | } |
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156 | |
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157 | /// Pointer accessor for direct copying |
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158 | inline float* ptr() |
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159 | { |
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160 | return &r; |
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161 | } |
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162 | /// Pointer accessor for direct copying |
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163 | inline const float* ptr() const |
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164 | { |
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165 | return &r; |
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166 | } |
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167 | |
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168 | |
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169 | // arithmetic operations |
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170 | inline ColourValue operator + ( const ColourValue& rkVector ) const |
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171 | { |
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172 | ColourValue kSum; |
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173 | |
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174 | kSum.r = r + rkVector.r; |
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175 | kSum.g = g + rkVector.g; |
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176 | kSum.b = b + rkVector.b; |
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177 | kSum.a = a + rkVector.a; |
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178 | |
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179 | return kSum; |
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180 | } |
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181 | |
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182 | inline ColourValue operator - ( const ColourValue& rkVector ) const |
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183 | { |
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184 | ColourValue kDiff; |
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185 | |
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186 | kDiff.r = r - rkVector.r; |
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187 | kDiff.g = g - rkVector.g; |
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188 | kDiff.b = b - rkVector.b; |
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189 | kDiff.a = a - rkVector.a; |
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190 | |
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191 | return kDiff; |
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192 | } |
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193 | |
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194 | inline ColourValue operator * (const float fScalar ) const |
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195 | { |
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196 | ColourValue kProd; |
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197 | |
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198 | kProd.r = fScalar*r; |
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199 | kProd.g = fScalar*g; |
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200 | kProd.b = fScalar*b; |
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201 | kProd.a = fScalar*a; |
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202 | |
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203 | return kProd; |
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204 | } |
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205 | |
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206 | inline ColourValue operator * ( const ColourValue& rhs) const |
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207 | { |
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208 | ColourValue kProd; |
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209 | |
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210 | kProd.r = rhs.r * r; |
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211 | kProd.g = rhs.g * g; |
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212 | kProd.b = rhs.b * b; |
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213 | kProd.a = rhs.a * a; |
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214 | |
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215 | return kProd; |
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216 | } |
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217 | |
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218 | inline ColourValue operator / ( const ColourValue& rhs) const |
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219 | { |
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220 | ColourValue kProd; |
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221 | |
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222 | kProd.r = rhs.r / r; |
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223 | kProd.g = rhs.g / g; |
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224 | kProd.b = rhs.b / b; |
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225 | kProd.a = rhs.a / a; |
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226 | |
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227 | return kProd; |
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228 | } |
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229 | |
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230 | inline ColourValue operator / (const float fScalar ) const |
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231 | { |
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232 | assert( fScalar != 0.0 ); |
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233 | |
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234 | ColourValue kDiv; |
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235 | |
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236 | float fInv = 1.0 / fScalar; |
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237 | kDiv.r = r * fInv; |
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238 | kDiv.g = g * fInv; |
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239 | kDiv.b = b * fInv; |
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240 | kDiv.a = a * fInv; |
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241 | |
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242 | return kDiv; |
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243 | } |
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244 | |
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245 | inline friend ColourValue operator * (const float fScalar, const ColourValue& rkVector ) |
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246 | { |
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247 | ColourValue kProd; |
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248 | |
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249 | kProd.r = fScalar * rkVector.r; |
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250 | kProd.g = fScalar * rkVector.g; |
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251 | kProd.b = fScalar * rkVector.b; |
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252 | kProd.a = fScalar * rkVector.a; |
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253 | |
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254 | return kProd; |
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255 | } |
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256 | |
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257 | // arithmetic updates |
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258 | inline ColourValue& operator += ( const ColourValue& rkVector ) |
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259 | { |
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260 | r += rkVector.r; |
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261 | g += rkVector.g; |
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262 | b += rkVector.b; |
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263 | a += rkVector.a; |
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264 | |
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265 | return *this; |
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266 | } |
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267 | |
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268 | inline ColourValue& operator -= ( const ColourValue& rkVector ) |
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269 | { |
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270 | r -= rkVector.r; |
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271 | g -= rkVector.g; |
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272 | b -= rkVector.b; |
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273 | a -= rkVector.a; |
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274 | |
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275 | return *this; |
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276 | } |
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277 | |
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278 | inline ColourValue& operator *= (const float fScalar ) |
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279 | { |
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280 | r *= fScalar; |
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281 | g *= fScalar; |
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282 | b *= fScalar; |
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283 | a *= fScalar; |
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284 | return *this; |
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285 | } |
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286 | |
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287 | inline ColourValue& operator /= (const float fScalar ) |
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288 | { |
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289 | assert( fScalar != 0.0 ); |
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290 | |
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291 | float fInv = 1.0 / fScalar; |
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292 | |
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293 | r *= fInv; |
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294 | g *= fInv; |
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295 | b *= fInv; |
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296 | a *= fInv; |
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297 | |
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298 | return *this; |
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299 | } |
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300 | |
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301 | /** Set a colour value from Hue, Saturation and Brightness. |
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302 | @param hue Hue value, scaled to the [0,1] range as opposed to the 0-360 |
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303 | @param saturation Saturation level, [0,1] |
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304 | @param brightness Brightness level, [0,1] |
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305 | */ |
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306 | void setHSB(Real hue, Real saturation, Real brightness); |
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307 | |
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308 | /** Convert the current colour to Hue, Saturation and Brightness values. |
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309 | @param hue Output hue value, scaled to the [0,1] range as opposed to the 0-360 |
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310 | @param saturation Output saturation level, [0,1] |
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311 | @param brightness Output brightness level, [0,1] |
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312 | */ |
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313 | void getHSB(Real* hue, Real* saturation, Real* brightness) const; |
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314 | |
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315 | |
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316 | |
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317 | /** Function for writing to a stream. |
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318 | */ |
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319 | inline _OgreExport friend std::ostream& operator << |
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320 | ( std::ostream& o, const ColourValue& c ) |
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321 | { |
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322 | o << "ColourValue(" << c.r << ", " << c.g << ", " << c.b << ", " << c.a << ")"; |
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323 | return o; |
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324 | } |
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325 | |
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326 | }; |
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327 | |
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328 | } // namespace |
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329 | |
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330 | #endif |
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