[1809] | 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) 2000-2005 The OGRE Team
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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 | */
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| 25 | #ifndef _COLOURVALUE_H__
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| 26 | #define _COLOURVALUE_H__
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| 27 |
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| 28 | #include "OgrePrerequisites.h"
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| 29 |
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| 30 | namespace Ogre {
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| 31 |
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| 32 | typedef uint32 RGBA;
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| 33 | typedef uint32 ARGB;
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| 34 | typedef uint32 ABGR;
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| 35 | typedef uint32 BGRA;
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| 36 |
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| 37 | /** Class representing colour.
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| 38 | @remarks
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| 39 | Colour is represented as 4 components, each of which is a
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| 40 | floating-point value from 0.0 to 1.0.
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| 41 | @par
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| 42 | The 3 'normal' colour components are red, green and blue, a higher
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| 43 | number indicating greater amounts of that component in the colour.
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| 44 | The forth component is the 'alpha' value, which represents
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| 45 | transparency. In this case, 0.0 is completely transparent and 1.0 is
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| 46 | fully opaque.
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| 47 | */
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| 48 | class _OgreExport ColourValue
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| 49 | {
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| 50 | public:
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| 51 | static const ColourValue ZERO;
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| 52 | static const ColourValue Black;
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| 53 | static const ColourValue White;
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| 54 | static const ColourValue Red;
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| 55 | static const ColourValue Green;
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| 56 | static const ColourValue Blue;
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| 57 |
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| 58 | explicit ColourValue( float red = 1.0f,
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| 59 | float green = 1.0f,
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| 60 | float blue = 1.0f,
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| 61 | float alpha = 1.0f ) : r(red), g(green), b(blue), a(alpha)
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| 62 | { }
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| 63 |
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| 64 | bool operator==(const ColourValue& rhs) const;
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| 65 | bool operator!=(const ColourValue& rhs) const;
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| 66 |
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| 67 | union {
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| 68 | struct {
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| 69 | float r,g,b,a;
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| 70 | };
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| 71 | float val[4];
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| 72 | };
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| 73 |
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| 74 | /** Retrieves colour as RGBA.
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| 75 | */
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| 76 | RGBA getAsRGBA(void) const;
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| 77 |
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| 78 | /** Retrieves colour as ARGB.
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| 79 | */
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| 80 | ARGB getAsARGB(void) const;
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| 81 |
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| 82 | /** Retrieves colour as BGRA.
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| 83 | */
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| 84 | BGRA getAsBGRA(void) const;
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| 85 |
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| 86 | /** Retrieves colours as ABGR */
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| 87 | ABGR getAsABGR(void) const;
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| 88 |
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| 89 | /** Sets colour as RGBA.
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| 90 | */
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| 91 | void setAsRGBA(const RGBA val);
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| 92 |
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| 93 | /** Sets colour as ARGB.
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| 94 | */
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| 95 | void setAsARGB(const ARGB val);
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| 96 |
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| 97 | /** Sets colour as BGRA.
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| 98 | */
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| 99 | void setAsBGRA(const BGRA val);
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| 100 |
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| 101 | /** Sets colour as ABGR.
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| 102 | */
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| 103 | void setAsABGR(const ABGR val);
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| 104 |
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| 105 | /** Clamps colour value to the range [0, 1].
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| 106 | */
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| 107 | void saturate(void)
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| 108 | {
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| 109 | if (r < 0)
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| 110 | r = 0;
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| 111 | else if (r > 1)
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| 112 | r = 1;
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| 113 |
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| 114 | if (g < 0)
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| 115 | g = 0;
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| 116 | else if (g > 1)
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| 117 | g = 1;
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| 118 |
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| 119 | if (b < 0)
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| 120 | b = 0;
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| 121 | else if (b > 1)
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| 122 | b = 1;
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| 123 |
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| 124 | if (a < 0)
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| 125 | a = 0;
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| 126 | else if (a > 1)
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| 127 | a = 1;
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| 128 | }
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| 129 |
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| 130 | /** As saturate, except that this colour value is unaffected and
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| 131 | the saturated colour value is returned as a copy. */
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| 132 | ColourValue saturateCopy(void) const
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| 133 | {
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| 134 | ColourValue ret = *this;
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| 135 | ret.saturate();
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| 136 | return ret;
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| 137 | }
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| 138 |
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| 139 | // arithmetic operations
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| 140 | inline ColourValue operator + ( const ColourValue& rkVector ) const
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| 141 | {
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| 142 | ColourValue kSum;
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| 143 |
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| 144 | kSum.r = r + rkVector.r;
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| 145 | kSum.g = g + rkVector.g;
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| 146 | kSum.b = b + rkVector.b;
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| 147 | kSum.a = a + rkVector.a;
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| 148 |
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| 149 | return kSum;
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| 150 | }
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| 151 |
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| 152 | inline ColourValue operator - ( const ColourValue& rkVector ) const
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| 153 | {
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| 154 | ColourValue kDiff;
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| 155 |
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| 156 | kDiff.r = r - rkVector.r;
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| 157 | kDiff.g = g - rkVector.g;
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| 158 | kDiff.b = b - rkVector.b;
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| 159 | kDiff.a = a - rkVector.a;
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| 160 |
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| 161 | return kDiff;
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| 162 | }
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| 163 |
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| 164 | inline ColourValue operator * (const float fScalar ) const
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| 165 | {
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| 166 | ColourValue kProd;
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| 167 |
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| 168 | kProd.r = fScalar*r;
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| 169 | kProd.g = fScalar*g;
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| 170 | kProd.b = fScalar*b;
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| 171 | kProd.a = fScalar*a;
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| 172 |
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| 173 | return kProd;
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| 174 | }
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| 175 |
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| 176 | inline ColourValue operator * ( const ColourValue& rhs) const
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| 177 | {
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| 178 | ColourValue kProd;
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| 179 |
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| 180 | kProd.r = rhs.r * r;
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| 181 | kProd.g = rhs.g * g;
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| 182 | kProd.b = rhs.b * b;
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| 183 | kProd.a = rhs.a * a;
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| 184 |
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| 185 | return kProd;
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| 186 | }
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| 187 |
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| 188 | inline ColourValue operator / ( const ColourValue& rhs) const
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| 189 | {
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| 190 | ColourValue kProd;
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| 191 |
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| 192 | kProd.r = rhs.r / r;
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| 193 | kProd.g = rhs.g / g;
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| 194 | kProd.b = rhs.b / b;
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| 195 | kProd.a = rhs.a / a;
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| 196 |
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| 197 | return kProd;
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| 198 | }
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| 199 |
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| 200 | inline ColourValue operator / (const float fScalar ) const
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| 201 | {
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| 202 | assert( fScalar != 0.0 );
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| 203 |
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| 204 | ColourValue kDiv;
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| 205 |
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| 206 | float fInv = 1.0 / fScalar;
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| 207 | kDiv.r = r * fInv;
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| 208 | kDiv.g = g * fInv;
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| 209 | kDiv.b = b * fInv;
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| 210 | kDiv.a = a * fInv;
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| 211 |
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| 212 | return kDiv;
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| 213 | }
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| 214 |
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| 215 | inline friend ColourValue operator * (const float fScalar, const ColourValue& rkVector )
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| 216 | {
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| 217 | ColourValue kProd;
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| 218 |
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| 219 | kProd.r = fScalar * rkVector.r;
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| 220 | kProd.g = fScalar * rkVector.g;
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| 221 | kProd.b = fScalar * rkVector.b;
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| 222 | kProd.a = fScalar * rkVector.a;
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| 223 |
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| 224 | return kProd;
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| 225 | }
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| 226 |
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| 227 | // arithmetic updates
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| 228 | inline ColourValue& operator += ( const ColourValue& rkVector )
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| 229 | {
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| 230 | r += rkVector.r;
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| 231 | g += rkVector.g;
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| 232 | b += rkVector.b;
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| 233 | a += rkVector.a;
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| 234 |
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| 235 | return *this;
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| 236 | }
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| 237 |
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| 238 | inline ColourValue& operator -= ( const ColourValue& rkVector )
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| 239 | {
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| 240 | r -= rkVector.r;
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| 241 | g -= rkVector.g;
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| 242 | b -= rkVector.b;
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| 243 | a -= rkVector.a;
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| 244 |
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| 245 | return *this;
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| 246 | }
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| 247 |
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| 248 | inline ColourValue& operator *= (const float fScalar )
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| 249 | {
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| 250 | r *= fScalar;
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| 251 | g *= fScalar;
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| 252 | b *= fScalar;
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| 253 | a *= fScalar;
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| 254 | return *this;
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| 255 | }
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| 256 |
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| 257 | inline ColourValue& operator /= (const float fScalar )
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| 258 | {
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| 259 | assert( fScalar != 0.0 );
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| 260 |
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| 261 | float fInv = 1.0 / fScalar;
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| 262 |
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| 263 | r *= fInv;
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| 264 | g *= fInv;
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| 265 | b *= fInv;
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| 266 | a *= fInv;
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| 267 |
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| 268 | return *this;
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| 269 | }
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| 270 |
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| 271 | /** Set a colour value from Hue, Saturation and Brightness.
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| 272 | @param hue Hue value, scaled to the [0,1] range as opposed to the 0-360
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| 273 | @param saturation Saturation level, [0,1]
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| 274 | @param brightness Brightness level, [0,1]
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| 275 | */
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| 276 | void setHSB(Real hue, Real saturation, Real brightness);
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| 277 |
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| 278 |
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| 279 | /** Function for writing to a stream.
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| 280 | */
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| 281 | inline _OgreExport friend std::ostream& operator <<
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| 282 | ( std::ostream& o, const ColourValue& c )
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| 283 | {
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| 284 | o << "ColourValue(" << c.r << ", " << c.g << ", " << c.b << ", " << c.a << ")";
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| 285 | return o;
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| 286 | }
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| 287 |
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| 288 | };
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| 289 |
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| 290 | } // namespace
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| 291 |
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| 292 | #endif
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