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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commit47d455dd55be855e4cc691c32f687f723d9247ee (patch)
tree52e236aaa2576bdb3840ebede26619692fed6d7d /libkscan/kgammatable.cpp
downloadtdegraphics-47d455dd55be855e4cc691c32f687f723d9247ee.tar.gz
tdegraphics-47d455dd55be855e4cc691c32f687f723d9247ee.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
Diffstat (limited to 'libkscan/kgammatable.cpp')
-rw-r--r--libkscan/kgammatable.cpp93
1 files changed, 93 insertions, 0 deletions
diff --git a/libkscan/kgammatable.cpp b/libkscan/kgammatable.cpp
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+/* This file is part of the KDE Project
+ Copyright (C) 2002 Klaas Freitag <freitag@suse.de>
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with this library; see the file COPYING.LIB. If not, write to
+ the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+#include <math.h>
+
+#include <kdebug.h>
+#include "kgammatable.h"
+
+KGammaTable::KGammaTable( int gamma, int brightness, int contrast )
+ : QObject()
+{
+ g = gamma < 1 ? 1 : gamma;
+ b = brightness;
+ c = contrast;
+ gt.resize(256);
+ calcTable();
+}
+
+const KGammaTable& KGammaTable::operator=(const KGammaTable& gt)
+{
+ if( this != &gt )
+ {
+ g = gt.g;
+ b = gt.b;
+ c = gt.c;
+
+ calcTable();
+ }
+
+ return( *this );
+}
+
+inline SANE_Word adjust( SANE_Word x, int gl,int bl,int cl)
+{
+ //printf("x : %d, x/256 : %lg, g : %d, 100/g : %lg",
+ // x,(double)x/256.0,g,100.0/(double)g);
+ x = ( SANE_Int )(256*pow((double)x/256.0,100.0/(double)gl));
+ x = ((65536/(128-cl)-256)*(x-128)>>8)+128+bl;
+ if(x<0) x = 0; else if(x>255) x = 255;
+ //printf(" -> %d\n",x);
+ return x;
+}
+
+void KGammaTable::calcTable( )
+{
+ int br = (b<<8)/(128-c);
+ int gr = g;
+ int cr = c;
+
+ if( gr == 0 )
+ {
+ kdDebug(29000) << "Cant calc table -> would raise div. by zero !" << endl;
+ return;
+ }
+
+ for( SANE_Word i = 0; i<256; i++)
+ gt[i] = adjust(i, gr, br, cr );
+
+ dirty = false;
+}
+
+void KGammaTable::setAll( int gamma, int brightness, int contrast )
+{
+ g = gamma < 1 ? 1 : gamma;
+ b = brightness;
+ c = contrast;
+
+ dirty = true;
+}
+
+
+SANE_Word* KGammaTable::getTable()
+{
+ if( dirty ) calcTable();
+ return( gt.data());
+}
+#include "kgammatable.moc"