summaryrefslogtreecommitdiffstats
path: root/kgamma/kcmkgamma/kgamma.cpp
blob: 99eddbaf0153f3512f6369a251aa063f4fe1dcca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
/***************************************************************************
                          kgamma.cpp  -  description
                             -------------------
    begin                : Sun Dec 16 13:52:24 CET 2001
    copyright            : (C) 2001 by Michael v.Ostheim
    email                : MvOstheim@web.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include <unistd.h>

#include <tqlabel.h>
#include <tqpixmap.h>
#include <tqstring.h>
#include <layout.h>
#include <tqstringlist.h>
#include <tqdir.h>
#include <tqcheckbox.h>
#include <tqcombobox.h>
#include <tqwidgetstack.h>

#include <kstandarddirs.h>
#include <kconfig.h>
#include <klocale.h>
#include <kglobal.h>
#include <kprocess.h>
#include <kdialog.h>
#include <kgenericfactory.h>

#include "config.h"
#include "xf86configpath.h"
#include "gammactrl.h"
#include "xvidextwrap.h"
#include "kgamma.h"
#include "kgamma.moc"

typedef KGenericFactory<KGamma, TQWidget> KGammaFactory;
K_EXPORT_COMPONENT_FACTORY ( kcm_kgamma, KGammaFactory( "kgamma" ) )

extern "C"
{
	bool test_kgamma()
	{
		bool retval;
		(void) new XVidExtWrap(&retval, NULL);
		return retval;
	}
}

KGamma::KGamma(TQWidget *parent, const char *name, const TQStringList&)
    :KCModule(parent,name)
{
  bool ok;
  GammaCorrection = true;
  xv = new XVidExtWrap(&ok, NULL);
  if (ok) { /* KDE 4: Uneccessary test, when all KCM wrappers do conditional loading */
    xv->getGamma(XVidExtWrap::Red, &ok);
    if (ok) {
      ScreenCount = xv->_ScreenCount();
      currentScreen = xv->getScreen();
      xv->setGammaLimits(0.4, 3.5);

      for (int i = 0; i < ScreenCount; i++ ) {
        assign << 0;
        rgamma << "";
        ggamma << "";
        bgamma << "";

        // Store the current gamma values
        xv->setScreen(i);
        rbak << xv->getGamma(XVidExtWrap::Red);
        gbak << xv->getGamma(XVidExtWrap::Green);
        bbak << xv->getGamma(XVidExtWrap::Blue);
      }
      xv->setScreen(currentScreen);

      rootProcess = new KProcess;
      setupUI();
      saved = false;

      if (!loadSettings()) {  //try to load gamma values from config file
        // if failed, take current gamma values
        for (int i = 0; i < ScreenCount; i++ ) {
          rgamma[i].setNum(rbak[i], 'f', 2);
          ggamma[i].setNum(gbak[i], 'f', 2);
          bgamma[i].setNum(bbak[i], 'f', 2);
        }
      }
      load();
    }
    else {  //something is wrong, show only error message
      GammaCorrection = false;
      setupUI();
    }
  }
}

KGamma::~KGamma() {
  // Restore the old gamma settings, if the user has not saved
  // and there is no valid kgammarc.
  // Existing user settings overwrite system settings
  if (GammaCorrection) {
    if ( loadUserSettings() ) load();
    else if ( !saved )
      for (int i = 0; i < ScreenCount; i++ ) {
        xv->setScreen(i);
        xv->setGamma( XVidExtWrap::Red, rbak[i] );
        xv->setGamma( XVidExtWrap::Green, gbak[i] );
        xv->setGamma( XVidExtWrap::Blue, bbak[i] );
      }
    delete rootProcess;
  }
  delete xv;
}

/** User interface */
void KGamma::setupUI() {
  TQBoxLayout *topLayout = new TQVBoxLayout(this, 0, KDialog::spacingHint());

  if (GammaCorrection) {
    TQHBoxLayout *hbox = new TQHBoxLayout( topLayout );
    TQLabel *label = new TQLabel( i18n( "&Select test picture:" ) , this);
    TQComboBox *combo = new TQComboBox( this );
    label->setBuddy( combo );

    TQStringList list;
    list << i18n( "Gray Scale" )
         << i18n( "RGB Scale" )
         << i18n( "CMY Scale" )
         << i18n( "Dark Gray" )
         << i18n( "Mid Gray" )
         << i18n( "Light Gray" );
    combo->insertStringList( list );

    hbox->addWidget( label );
    hbox->addWidget( combo );
    hbox->addStretch();

    TQWidgetStack *stack = new TQWidgetStack( this );
    stack->setFrameStyle( TQFrame::Box | TQFrame::Raised );

    connect( combo, TQT_SIGNAL( activated( int ) ),
             stack, TQT_SLOT( raiseWidget( int ) ) );

    TQPixmap background;
    background.load(locate("data", "kgamma/pics/background.png"));

    TQLabel *pic1 = new TQLabel(stack);
    pic1->setMinimumSize(530, 171);
    pic1->setBackgroundPixmap(background);
    pic1->setPixmap(TQPixmap(locate("data", "kgamma/pics/greyscale.png")));
    pic1->setAlignment(AlignCenter);
    stack->addWidget( pic1, 0 );

    TQLabel *pic2 = new TQLabel(stack);
    pic2->setBackgroundPixmap(background);
    pic2->setPixmap(TQPixmap(locate("data", "kgamma/pics/rgbscale.png")));
    pic2->setAlignment(AlignCenter);
    stack->addWidget( pic2, 1 );

    TQLabel *pic3 = new TQLabel(stack);
    pic3->setBackgroundPixmap(background);
    pic3->setPixmap(TQPixmap(locate("data", "kgamma/pics/cmyscale.png")));
    pic3->setAlignment(AlignCenter);
    stack->addWidget( pic3, 2 );

    TQLabel *pic4 = new TQLabel(stack);
    pic4->setBackgroundPixmap(background);
    pic4->setPixmap(TQPixmap(locate("data", "kgamma/pics/darkgrey.png")));
    pic4->setAlignment(AlignCenter);
    stack->addWidget( pic4, 3 );

    TQLabel *pic5 = new TQLabel(stack);
    pic5->setBackgroundPixmap(background);
    pic5->setPixmap(TQPixmap(locate("data", "kgamma/pics/midgrey.png")));
    pic5->setAlignment(AlignCenter);
    stack->addWidget( pic5, 4 );

    TQLabel *pic6 = new TQLabel(stack);
    pic6->setBackgroundPixmap(background);
    pic6->setPixmap(TQPixmap(locate("data", "kgamma/pics/lightgrey.png")));
    pic6->setAlignment(AlignCenter);
    stack->addWidget( pic6, 5 );

    topLayout->addWidget(stack, 10);

    //Sliders for gamma correction
    TQFrame *frame1 = new TQFrame(this);
    frame1->setFrameStyle( TQFrame::GroupBoxPanel | TQFrame::Plain );

    TQFrame *frame2 = new TQFrame(this);
    frame2->setFrameStyle( TQFrame::GroupBoxPanel | TQFrame::Plain );

    TQLabel *gammalabel = new TQLabel(this);
    gammalabel->setText(i18n("Gamma:"));

    TQLabel *redlabel = new TQLabel(this);
    redlabel->setText(i18n("Red:"));

    TQLabel *greenlabel = new TQLabel(this);
    greenlabel->setText(i18n("Green:"));

    TQLabel *bluelabel = new TQLabel(this);
    bluelabel->setText(i18n("Blue:"));

    gctrl = new GammaCtrl(this, xv);
    connect(gctrl, TQT_SIGNAL(gammaChanged(int)), TQT_SLOT(Changed()));
    connect(gctrl, TQT_SIGNAL(gammaChanged(int)), TQT_SLOT(SyncScreens()));
    gammalabel->setBuddy( gctrl );

    rgctrl = new GammaCtrl(this, xv, XVidExtWrap::Red);
    connect(rgctrl, TQT_SIGNAL(gammaChanged(int)), TQT_SLOT(Changed()));
    connect(rgctrl, TQT_SIGNAL(gammaChanged(int)), TQT_SLOT(SyncScreens()));
    connect(gctrl, TQT_SIGNAL(gammaChanged(int)), rgctrl, TQT_SLOT(setCtrl(int)));
    connect(rgctrl, TQT_SIGNAL(gammaChanged(int)), gctrl, TQT_SLOT(suspend()));
    redlabel->setBuddy( rgctrl );

    ggctrl = new GammaCtrl(this, xv, XVidExtWrap::Green);
    connect(ggctrl, TQT_SIGNAL(gammaChanged(int)), TQT_SLOT(Changed()));
    connect(ggctrl, TQT_SIGNAL(gammaChanged(int)), TQT_SLOT(SyncScreens()));
    connect(gctrl, TQT_SIGNAL(gammaChanged(int)), ggctrl, TQT_SLOT(setCtrl(int)));
    connect(ggctrl, TQT_SIGNAL(gammaChanged(int)), gctrl, TQT_SLOT(suspend()));
    greenlabel->setBuddy( ggctrl );

    bgctrl = new GammaCtrl(this, xv, XVidExtWrap::Blue);
    connect(bgctrl, TQT_SIGNAL(gammaChanged(int)), TQT_SLOT(Changed()));
    connect(bgctrl, TQT_SIGNAL(gammaChanged(int)), TQT_SLOT(SyncScreens()));
    connect(gctrl, TQT_SIGNAL(gammaChanged(int)), bgctrl, TQT_SLOT(setCtrl(int)));
    connect(bgctrl, TQT_SIGNAL(gammaChanged(int)), gctrl, TQT_SLOT(suspend()));
    bluelabel->setBuddy( bgctrl );

    TQGridLayout *grid = new TQGridLayout(4, 9);
    grid->setSpacing(8);
    grid->addMultiCellWidget(frame1, 0, 2, 0, 3);
    grid->addMultiCellWidget(frame2, 4, 8, 0, 3);
    grid->addWidget(gammalabel, 1, 1, TQt::AlignRight);
    grid->addWidget(redlabel, 5, 1, TQt::AlignRight);
    grid->addWidget(greenlabel, 6, 1, TQt::AlignRight);
    grid->addWidget(bluelabel, 7, 1, TQt::AlignRight);
    grid->addWidget(gctrl, 1, 2);
    grid->addWidget(rgctrl, 5, 2);
    grid->addWidget(ggctrl, 6, 2);
    grid->addWidget(bgctrl, 7, 2);

    topLayout->addLayout(grid);

    //Options
    TQHBox *options = new TQHBox(this);

    xf86cfgbox = new TQCheckBox( i18n("Save settings to XF86Config"), options );
    connect(xf86cfgbox, TQT_SIGNAL(clicked()), TQT_SLOT(changeConfig()));

    syncbox = new TQCheckBox( i18n("Sync screens"), options );
    connect(syncbox, TQT_SIGNAL(clicked()), TQT_SLOT(SyncScreens()));
    connect(syncbox, TQT_SIGNAL(clicked()), TQT_SLOT(Changed()));

    screenselect = new TQComboBox( options );
    for ( int i = 0; i < ScreenCount; i++ )
      screenselect->insertItem( i18n("Screen %1").arg(i+1) );
    screenselect->setCurrentItem(currentScreen);
    connect(screenselect, TQT_SIGNAL(activated(int)), TQT_SLOT(changeScreen(int)));

    options->setSpacing( 10 );
    options->setStretchFactor( xf86cfgbox, 10 );
    options->setStretchFactor( syncbox, 1 );
    options->setStretchFactor( screenselect, 1 );

    topLayout->addWidget(options);
  }
  else {
    TQLabel *error = new TQLabel(this);
    error->setText(i18n("Gamma correction is not supported by your"
    " graphics hardware or driver."));
    error->setAlignment(AlignCenter);
    topLayout->addWidget(error);
  }
}

void KGamma::load() {
	load( false );
}

/** Restore latest saved gamma values */
void KGamma::load(bool useDefaults) {
  if (GammaCorrection) {
    KConfig *config = new KConfig("kgammarc");

	 config->setReadDefaults( useDefaults );

    config->setGroup("ConfigFile");

    // save checkbox status
    if ( xf86cfgbox->isChecked() ) config->writeEntry("use", "XF86Config");
    else config->writeEntry("use", "kgammarc");

    // load syncbox status
    config->setGroup("SyncBox");
    if ( config->readEntry("sync") == "yes" ) syncbox->setChecked(true);
    else syncbox->setChecked(false);

    config->sync();
    delete config;

    for (int i = 0; i < ScreenCount; i++) {
      xv->setScreen(i);
      if (rgamma[i] == ggamma[i] && rgamma[i] == bgamma[i])
        if (i == currentScreen) gctrl->setGamma(rgamma[i]);
        else xv->setGamma(XVidExtWrap::Value, rgamma[i].toFloat());
      else {
        if (i == currentScreen) {
          rgctrl->setGamma(rgamma[i]);
          ggctrl->setGamma(ggamma[i]);
          bgctrl->setGamma(bgamma[i]);
          gctrl->suspend();
        }
        else {
          xv->setGamma(XVidExtWrap::Red, rgamma[i].toFloat());
          xv->setGamma(XVidExtWrap::Green, ggamma[i].toFloat());
          xv->setGamma(XVidExtWrap::Blue, bgamma[i].toFloat());
        }
      }
    }
    xv->setScreen(currentScreen);

    emit changed(useDefaults);
  }
}

void KGamma::save() {
  if (GammaCorrection) {
    for (int i = 0; i < ScreenCount; i++) {
      xv->setScreen(i);
      rgamma[i] = rgctrl->gamma(2);
      ggamma[i] = ggctrl->gamma(2);
      bgamma[i] = bgctrl->gamma(2);
    }
    xv->setScreen(currentScreen);

    KConfig *config = new KConfig("kgammarc");
    config->setGroup("SyncBox");
    if ( syncbox->isChecked() ) config->writeEntry("sync", "yes");
    else config->writeEntry("sync", "no");

    if ( !xf86cfgbox->isChecked() ) { //write gamma settings to the users config
      for (int i = 0; i < ScreenCount; i++) {
        config->setGroup( TQString("Screen %1").arg(i) );
        config->writeEntry("rgamma", rgamma[i]);
        config->writeEntry("ggamma", ggamma[i]);
        config->writeEntry("bgamma", bgamma[i]);
      }
      config->setGroup("ConfigFile");
      config->writeEntry("use", "kgammarc");
    }
    else {  // write gamma settings to section "Monitor" of XF86Config
      config->setGroup("ConfigFile");
      config->writeEntry("use", "XF86Config");

      if ( !rootProcess->isRunning() ) {
        TQString Arguments = "xf86gammacfg ";
        for (int i = 0; i < ScreenCount; i++)
          Arguments += rgamma[assign[i]] + " " + ggamma[assign[i]] + " " + \
          bgamma[assign[i]] + " ";
        rootProcess->clearArguments();
        *rootProcess << "tdesu" << Arguments;
        rootProcess->start();
      }
    }
    config->sync();
    delete config;
    saved = true;
    emit changed(false);
  }
}

void KGamma::defaults() {
	load( true );
}

bool KGamma::loadSettings() {
  KConfig *config = new KConfig("kgammarc");
  config->setGroup("ConfigFile");
  TQString ConfigFile( config->readEntry("use") );
  config->setGroup("SyncBox");
  if ( config->readEntry("sync") == "yes" ) syncbox->setChecked(true);
  delete config;

  if ( ConfigFile == "XF86Config" ) {  // parse XF86Config
    xf86cfgbox->setChecked(true);
    return( loadSystemSettings() );
  }
  else { //get gamma settings from user config
    return( loadUserSettings() );
  }
}

bool KGamma::loadUserSettings() {
  KConfig *config = new KConfig("kgammarc");

  for (int i = 0; i < ScreenCount; i++) {
    config->setGroup(TQString( "Screen %1" ).arg(i) );
    rgamma[i] = config->readEntry("rgamma");
    ggamma[i] = config->readEntry("ggamma");
    bgamma[i] = config->readEntry("bgamma");
  }
  delete config;

  return( validateGammaValues() );
}

bool KGamma::loadSystemSettings() {
  TQStringList Monitor, Screen, ScreenLayout, ScreenMonitor, Gamma;
  TQValueList<int> ScreenNr;
  TQString Section;
  XF86ConfigPath Path;

  TQFile f( Path.get() );
  if ( f.open(IO_ReadOnly) ) {
    TQTextStream t( &f );
    TQString s;
    int sn = 0;
    bool gm = false;

    // Analyse Screen<->Monitor assignments of multi-head configurations
    while ( !t.eof() ) {
      s = (t.readLine()).simplifyWhiteSpace();
      TQStringList words = TQStringList::split(' ', s);

      if ( !words.empty() ) {
        if ( words[0] == "Section" && words.size() > 1 ) {
          if ( (Section = words[1]) == "\"Monitor\"" ) gm = false;
        }
        else if ( words[0] == "EndSection" ) {
          if ( Section == "\"Monitor\"" && !gm ) {
            Gamma << "";
            gm = false;
          }
          Section = "";
        }
        else if ( words[0] == "Identifier" && words.size() > 1 ) {
          if ( Section == "\"Monitor\"" ) Monitor << words[1];
          else if ( Section == "\"Screen\"" ) Screen << words[1];
        }
        else if ( words[0] == "Screen" && words.size() > 1 ) {
          if ( Section == "\"ServerLayout\"" ) {
            bool ok;
            int i = words[1].toInt(&ok);
            if ( ok && words.size() > 2 ) {
              ScreenNr << i;
              ScreenLayout << words[2];
            }
            else {
              ScreenNr << sn++;
              ScreenLayout << words[1];
            }
          }
        }
        else if ( words[0] == "Monitor" && words.size() > 1 ) {
          if ( Section == "\"Screen\"" )
            ScreenMonitor << words[1];
        }
        else if ( words[0] == "Gamma" ) {
          if ( Section == "\"Monitor\"" ) {
            Gamma << s;
            gm = true;
          }
        }
      }
    } // End while
    f.close();

    for ( int i = 0; i < ScreenCount; i++ ) {
      for ( int j = 0; j < ScreenCount; j++ ) {
        if ( ScreenLayout[i] == Screen[j] ) {
          for ( int k = 0; k < ScreenCount; k++ ) {
            if ( Monitor[k] == ScreenMonitor[j] )
              assign[ScreenNr[i]] = k;
          }
        }
      }
    }

    // Extract gamma values
    for ( int i = 0; i < ScreenCount; i++) {
      rgamma[i] = ggamma[i] = bgamma[i] = "";

      TQStringList words = TQStringList::split(' ', Gamma[assign[i]]);
      TQStringList::ConstIterator it = words.begin();
      if ( words.size() < 4 )
        rgamma[i] = ggamma[i] = bgamma[i] = *(++it);   // single gamma value
      else  {
        rgamma[i] = *(++it);  // eventually rgb gamma values
        ggamma[i] = *(++it);
        bgamma[i] = *(++it);
      }
    }

  }
  return( validateGammaValues() );
}

bool KGamma::validateGammaValues() {
  bool rOk, gOk, bOk, result;

  result = true;
  for (int i = 0; i < ScreenCount; i++ ) {
    rgamma[i].toFloat( &rOk );
    ggamma[i].toFloat( &gOk );
    bgamma[i].toFloat( &bOk );

    if ( !(rOk && gOk && bOk) ) {
      if ( rOk ) ggamma[i] = bgamma[i] = rgamma[i];
      else result = false;
    }
  }
  return(result);
}

void KGamma::changeConfig() {
  bool Ok = false;

  if ( xf86cfgbox->isChecked() ) Ok = loadSystemSettings();
  else Ok = loadUserSettings();

  if ( !Ok ) {
    for (int i = 0; i < ScreenCount; i++ ) {
      xv->setScreen(i);
      rgamma[i].setNum(xv->getGamma(XVidExtWrap::Red), 'f', 2);
      ggamma[i].setNum(xv->getGamma(XVidExtWrap::Green), 'f', 2);
      bgamma[i].setNum(xv->getGamma(XVidExtWrap::Blue), 'f', 2);
    }
    xv->setScreen(currentScreen);
  }
  load();
}

void KGamma::SyncScreens() {
  if ( syncbox->isChecked() ) {
    float rg = xv->getGamma(XVidExtWrap::Red);
    float gg = xv->getGamma(XVidExtWrap::Green);
    float bg = xv->getGamma(XVidExtWrap::Blue);

    for (int i = 0; i < ScreenCount; i++ ) {
      if ( i != currentScreen ) {
        xv->setScreen(i);
        xv->setGamma(XVidExtWrap::Red, rg);
        xv->setGamma(XVidExtWrap::Green, gg);
        xv->setGamma(XVidExtWrap::Blue, bg);
      }
    }
    xv->setScreen(currentScreen);
  }
}

void KGamma::changeScreen(int sn) {
  TQString red, green, blue;

  xv->setScreen(sn);
  currentScreen = sn;

  red.setNum(xv->getGamma(XVidExtWrap::Red), 'f', 2);
  green.setNum(xv->getGamma(XVidExtWrap::Green), 'f', 2);
  blue.setNum(xv->getGamma(XVidExtWrap::Blue), 'f', 2);

  gctrl->setControl(red);
  rgctrl->setControl(red);
  ggctrl->setControl(green);
  bgctrl->setControl(blue);
  if (red != green || red != blue) gctrl->suspend();
}

int KGamma::buttons () {
  return Default|Apply|Help;
}

TQString KGamma::quickHelp() const
{
  return i18n("<h1>Monitor Gamma</h1> This is a tool for changing monitor gamma"
    " correction. Use the four sliders to define the gamma correction either"
    " as a single value, or separately for the red, green and blue components."
    " You may need to correct the brightness and contrast settings of your"
    " monitor for good results. The test images help you to find proper"
    " settings.<br> You can save them system-wide to XF86Config (root access"
    " is required for that) or to your own KDE settings. On multi head"
    " systems you can correct the gamma values separately for all screens.");
}


// ------------------------------------------------------------------------

extern "C"
{
  // Restore the user gamma settings
  void init_kgamma()
  {
    bool ok;
    XVidExtWrap xv(&ok);

    if (ok) {
      xv.setGammaLimits(0.4, 3.5);
      float rgamma, ggamma, bgamma;
      KConfig *config = new KConfig("kgammarc");

      for (int i = 0; i < xv._ScreenCount(); i++) {
        xv.setScreen(i);
        config->setGroup( TQString("Screen %1").arg(i) );

        if ((rgamma = config->readEntry("rgamma").toFloat()))
          xv.setGamma(XVidExtWrap::Red, rgamma);
        if ((ggamma = config->readEntry("ggamma").toFloat()))
          xv.setGamma(XVidExtWrap::Green, ggamma);
        if ((bgamma = config->readEntry("bgamma").toFloat()))
          xv.setGamma(XVidExtWrap::Blue, bgamma);
      }
      delete config;
    }
  }
}