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94 lines
2.2 KiB
94 lines
2.2 KiB
/* This file is part of the KDE Project
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Copyright (C) 2002 Klaas Freitag <freitag@suse.de>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <math.h>
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#include <kdebug.h>
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#include "kgammatable.h"
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KGammaTable::KGammaTable( int gamma, int brightness, int contrast )
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: TQObject()
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{
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g = gamma < 1 ? 1 : gamma;
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b = brightness;
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c = contrast;
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gt.resize(256);
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calcTable();
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}
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const KGammaTable& KGammaTable::operator=(const KGammaTable& gt)
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{
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if( this != > )
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{
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g = gt.g;
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b = gt.b;
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c = gt.c;
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calcTable();
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}
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return( *this );
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}
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inline SANE_Word adjust( SANE_Word x, int gl,int bl,int cl)
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{
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//printf("x : %d, x/256 : %lg, g : %d, 100/g : %lg",
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// x,(double)x/256.0,g,100.0/(double)g);
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x = ( SANE_Int )(256*pow((double)x/256.0,100.0/(double)gl));
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x = ((65536/(128-cl)-256)*(x-128)>>8)+128+bl;
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if(x<0) x = 0; else if(x>255) x = 255;
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//printf(" -> %d\n",x);
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return x;
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}
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void KGammaTable::calcTable( )
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{
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int br = (b<<8)/(128-c);
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int gr = g;
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int cr = c;
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if( gr == 0 )
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{
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kdDebug(29000) << "Cant calc table -> would raise div. by zero !" << endl;
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return;
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}
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for( SANE_Word i = 0; i<256; i++)
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gt[i] = adjust(i, gr, br, cr );
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dirty = false;
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}
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void KGammaTable::setAll( int gamma, int brightness, int contrast )
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{
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g = gamma < 1 ? 1 : gamma;
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b = brightness;
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c = contrast;
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dirty = true;
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}
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SANE_Word* KGammaTable::getTable()
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{
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if( dirty ) calcTable();
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return( gt.data());
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}
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#include "kgammatable.moc"
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