include/basebmp/color.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_BASEBMP_COLOR_HXX
  21 #define INCLUDED_BASEBMP_COLOR_HXX
  22
  23 #include <sal/types.h>
  24 #include <rtl/math.hxx>
  25
  26 namespace basebmp
  27 {
  28
  29 class Color
  30 {
  31 private:
  32     sal_uInt32          mnColor;
  33
  34 public:
  35     typedef sal_uInt32  value_type;
  36     typedef sal_uInt8   component_type;
  37
  38     Color() : mnColor(0) {}
  39     explicit Color( sal_uInt32 nVal ) : mnColor(nVal) {}
  40     Color( sal_uInt8 nRed, sal_uInt8 nGreen, sal_uInt8 nBlue ) :
  41         mnColor( ((sal_uInt32)nRed << 16) | ((sal_uInt32)nGreen << 8) | nBlue )
  42     {}
  43
  44     void setRed( sal_uInt8 nRed ) { mnColor &= ~0x00FF0000UL; mnColor |= (sal_uInt32)nRed << 16; }
  45     void setGreen( sal_uInt8 nGreen ) { mnColor &= ~0x0000FF00UL; mnColor |= (sal_uInt32)nGreen << 8; }
  46     void setBlue( sal_uInt8 nBlue ) { mnColor &= ~0x000000FFUL; mnColor |= nBlue; }
  47
  48     void setGrey( sal_uInt8 nGreyVal ) { mnColor = (sal_uInt32)nGreyVal << 16 | (sal_uInt32)nGreyVal << 8 | nGreyVal; }
  49
  50     sal_uInt8 getRed() const   { return 0xFF & (sal_uInt8)(mnColor >> 16); }
  51     sal_uInt8 getGreen() const { return 0xFF & (sal_uInt8)(mnColor >> 8); }
  52     sal_uInt8 getBlue() const  { return 0xFF & (sal_uInt8)mnColor; }
  53
  54     sal_uInt8 getGreyscale() const { return (sal_uInt8)((getBlue()*28UL +
  55                                                          getGreen()*151 +
  56                                                          getRed()*77) / 256); }
  57
  58     sal_uInt32 toInt32() const { return mnColor; }
  59
  60     bool  operator!() const { return mnColor == 0; }
  61     Color operator&( sal_uInt32 nMask ) const { return Color(mnColor & nMask); }
  62     Color operator^( Color col ) const { return Color(col.getRed()^getRed(),
  63                                                       col.getGreen()^getGreen(),
  64                                                       col.getBlue()^getBlue()); }
  65     Color operator-( Color col ) const { return Color((sal_uInt8)abs((int)getRed()-col.getRed()),
  66                                                       (sal_uInt8)abs((int)getGreen()-col.getGreen()),
  67                                                       (sal_uInt8)abs((int)getBlue()-col.getBlue())); }
  68     Color operator+( Color col ) const { return Color(getRed()+col.getRed(),
  69                                                       getGreen()+col.getGreen(),
  70                                                       getBlue()+col.getBlue()); }
  71     Color operator*( Color col ) const { return Color((sal_uInt8)((sal_uInt32)col.getRed()*getRed()/SAL_MAX_UINT8),
  72                                                       (sal_uInt8)((sal_uInt32)col.getGreen()*getGreen()/SAL_MAX_UINT8),
  73                                                       (sal_uInt8)((sal_uInt32)col.getBlue()*getBlue()/SAL_MAX_UINT8)); }
  74     Color operator*( sal_uInt8 n ) const { return Color((sal_uInt8)((sal_uInt32)n*getRed()/SAL_MAX_UINT8),
  75                                                         (sal_uInt8)((sal_uInt32)n*getGreen()/SAL_MAX_UINT8),
  76                                                         (sal_uInt8)((sal_uInt32)n*getBlue()/SAL_MAX_UINT8)); }
  77     Color operator*( double n ) const { return Color((sal_uInt8)(n*getRed()+.5),
  78                                                      (sal_uInt8)(n*getGreen()+.5),
  79                                                      (sal_uInt8)(n*getBlue()+.5)); }
  80     bool operator==( const Color& rhs ) const { return (getRed()==rhs.getRed() &&
  81                                                         getGreen()==rhs.getGreen() &&
  82                                                         getBlue()==rhs.getBlue()); }
  83     bool operator!=( const Color& rhs ) const { return !(*this==rhs); }
  84     double magnitude() const { return sqrt((double)getRed()*getRed()
  85                                            + getGreen()*getGreen()
  86                                            + getBlue()*getBlue()); }
  87 };
  88
  89 } // namespace vigra
  90
  91 #endif /* INCLUDED_BASEBMP_COLOR_HXX */
  92
  93 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */