src/colorgenerator.h

   1 /***************************************************************************
   2     copyright            : (C) 2004 by amarok squad
   3     email                : amarok@kde.org
   4  ***************************************************************************/
   5
   6 /***************************************************************************
   7  *   This library is free software; you can redistribute it and/or modify  *
   8  *   it  under the terms of the GNU Lesser General Public License version  *
   9  *   2.1 as published by the Free Software Foundation.                     *
  10  *                                                                         *
  11  *   This library is distributed in the hope that it will be useful, but   *
  12  *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
  14  *   Lesser General Public License for more details.                       *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU Lesser General Public      *
  17  *   License along with this library; if not, write to the Free Software   *
  18  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1307  *
  19  *   USA                                                                   *
  20  ***************************************************************************/
  21
  22 #ifndef COLORGENERATOR_H
  23 #define COLORGENERATOR_H
  24
  25 #include "debug.h"
  26
  27 namespace Amarok {
  28
  29
  30 class Color : public QColor
  31 {
  32     static const int CONTRAST = 130;
  33     static const int SATURATION_TARGET = 30;
  34
  35 public:
  36     Color( const QColor &c ) : QColor( c )
  37     {
  38         DEBUG_BLOCK
  39
  40         int h,s1,s,v1,v;
  41         getHsv( &h, &s1, &v1 );
  42
  43         debug() << "Initial Color Properties: s:" << s1 << " v:" << v1 << endl;
  44
  45         //we want the new colour to be low saturation
  46         //TODO what if s is less than SATURATION_TARGET to start with
  47         s = s1 - CONTRAST;
  48         v = v1;
  49
  50         if ( s < SATURATION_TARGET ) {
  51             int remainingContrast = SATURATION_TARGET - s;
  52             s = SATURATION_TARGET;
  53
  54             debug() << "Unapplied Contrast: " << remainingContrast << endl;
  55
  56             //we only add to the value to avoid the dreaded "grey-gradient"
  57             v += remainingContrast;
  58
  59             if ( v > 255 ) {
  60                 int error = v - 255;
  61                 debug() << "Over-compensation: " << error << endl;
  62
  63                 //if the error is significant then this must be a pretty bright colour
  64                 //it would look better if the gradient was dark
  65                 if( error > CONTRAST/2 )
  66                     v = v1 - error;
  67                 else
  68                     v = 255;
  69             }
  70         }
  71
  72         setHsv( h, s, v );
  73
  74         debug() << "Final Colour Properties: s:" << s << " v:" << v << endl;
  75     }
  76 };
  77
  78 }
  79
  80 #endif
  81