File: oxygenhelper.cpp

package info (click to toggle)
oxygen 4:5.8.4-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 25,856 kB
  • ctags: 2,619
  • sloc: cpp: 21,895; python: 39; makefile: 20; sh: 13
file content (1008 lines) | stat: -rw-r--r-- 33,721 bytes parent folder | download
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
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
/*
 * Copyright 2009-2010 Hugo Pereira Da Costa <hugo.pereira@free.fr>
 * Copyright 2008 Long Huynh Huu <long.upcase@googlemail.com>
 * Copyright 2007 Matthew Woehlke <mw_triad@users.sourceforge.net>
 * Copyright 2007 Casper Boemann <cbr@boemann.dk>
 * Copyright 2007 Fredrik H?glund <fredrik@kde.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License version 2 as published by the Free Software Foundation.
 *
 * 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 "oxygenhelper.h"
#include "liboxygen.h"

#include <KColorUtils>
#include <KColorScheme>

#if OXYGEN_USE_KDE4
#include <KGlobalSettings>
#endif

#include <QApplication>
#include <QWidget>
#include <QPainter>
#include <QTextStream>
#include <math.h>

#if OXYGEN_HAVE_X11
#include <QX11Info>
#endif

#if OXYGEN_HAVE_X11 && QT_VERSION < 0x050000
#include <X11/Xlib-xcb.h>
#endif

namespace Oxygen
{

    const qreal Helper::_slabThickness = 0.45;
    const qreal Helper::_shadowGain = 1.5;
    const qreal Helper::_glowBias = 0.6;

    //____________________________________________________________________
    Helper::Helper( KSharedConfig::Ptr config ):
        _config( config )
    { init(); }

    //____________________________________________________________________
    #if OXYGEN_USE_KDE4
    Helper::Helper( const QByteArray& name ):
        _componentData( name, 0, KComponentData::SkipMainComponentRegistration ),
        _config( _componentData.config() )
    { init(); }
    #endif

    //____________________________________________________________________
    KSharedConfig::Ptr Helper::config() const
    { return _config; }

    //____________________________________________________________________
    void Helper::loadConfig()
    {

        #if OXYGEN_USE_KDE4
        _contrast = KGlobalSettings::contrastF( _config );
        #else
        _contrast = KColorScheme::contrastF( _config );
        #endif

        _bgcontrast = qMin( 1.0, 0.9*_contrast/0.7 );

        _viewFocusBrush = KStatefulBrush( KColorScheme::View, KColorScheme::FocusColor, _config );
        _viewHoverBrush = KStatefulBrush( KColorScheme::View, KColorScheme::HoverColor, _config );
        _viewNegativeTextBrush = KStatefulBrush( KColorScheme::View, KColorScheme::NegativeText, _config );

    }

        //____________________________________________________________________
    void Helper::invalidateCaches()
    {
        _decoColorCache.clear();
        _lightColorCache.clear();
        _darkColorCache.clear();
        _shadowColorCache.clear();
        _backgroundTopColorCache.clear();
        _backgroundBottomColorCache.clear();
        _backgroundRadialColorCache.clear();
        _backgroundColorCache.clear();
        _backgroundCache.clear();
        _dotCache.clear();
    }

    //____________________________________________________________________
    void Helper::setMaxCacheSize( int value )
    {

        // assign value
        _backgroundCache.setMaxCost( value );
        _dotCache.setMaxCost( value );

        /* note: we do not limit the size of the color caches on purpose, since they should be small anyway */

    }

    //____________________________________________________________________
    void Helper::renderWindowBackground(QPainter* p, const QRect& clipRect, const QRect& windowRect, const QColor& color, int yShift)
    {

        if ( clipRect.isValid() )
        {
            p->save();
            p->setClipRegion( clipRect,Qt::IntersectClip );
        }

        // draw upper linear gradient
        const int splitY( qMin( 300, ( 3*windowRect.height() )/4 ) );

        QRect upperRect = windowRect;
        if( splitY+yShift>0 )
        {
            upperRect.setHeight(splitY+yShift);
            QPixmap tile( verticalGradient( color, splitY+yShift, yShift ) );
            p->drawTiledPixmap( upperRect, tile );
        }

        // draw lower flat part
        const QRect lowerRect = windowRect.adjusted(0, splitY+yShift, 0,  0);
        if( lowerRect.isValid() )
        { p->fillRect( lowerRect, backgroundBottomColor( color ) ); }

        // draw upper radial gradient
        const int radialW( qMin( 600, windowRect.width() ) );
        const QRect radialRect( ( windowRect.width() - radialW ) / 2 + windowRect.x(), windowRect.y(), radialW, 64 + yShift );
        if( clipRect.intersects( radialRect ) )
        {
            QPixmap tile = radialGradient( color, radialW, 64 + yShift );
            p->drawPixmap( radialRect, tile );

        }

        if ( clipRect.isValid() )
        { p->restore(); }
    }


    //____________________________________________________________________
    void Helper::renderWindowBackground( QPainter* p, const QRect& clipRect, const QWidget* widget, const QWidget* window, const QColor& color, int yShift )
    {

        // get coordinates relative to the client area
        // this is stupid. One could use mapTo if this was taking const QWidget* and not
        // QWidget* as argument.
        const QWidget* w( widget );
        int x( 0 );
        int y( 0 );

        while ( w != window && !w->isWindow() && w != w->parentWidget() )
        {
            x += w->geometry().x();
            y += w->geometry().y();
            w = w->parentWidget();
        }

        // translate and call the base method
        const QRect r = window->rect().translated( -x, -y );
        renderWindowBackground( p, clipRect, r, color, yShift );
    }

    //_____________________________________________________________
    void Helper::renderDot( QPainter* p, const QPoint& point, const QColor& baseColor )
    {

        const quint64 key( colorKey(baseColor) );
        QPixmap pixmap;

        if( QPixmap* cachedPixmap = _dotCache.object( key ) )
        {

            pixmap = *cachedPixmap;

        } else {

            pixmap = highDpiPixmap( 4 );
            pixmap.fill( Qt::transparent );
            const qreal diameter( 1.8 );

            QPainter painter( &pixmap );
            painter.setRenderHint( QPainter::Antialiasing );
            painter.setPen( Qt::NoPen );

            const QPoint center( QRect( 0, 0, 4, 4 ).center() );

            // light ellipse
            painter.setBrush( calcLightColor( baseColor ) );
            painter.drawEllipse( QRectF( center.x()-diameter/2+1.0, center.y()-diameter/2+1.0, diameter, diameter ) );

            // dark ellipse
            painter.setBrush( calcDarkColor( baseColor ).darker( 130 ) );
            painter.drawEllipse( QRectF( center.x()-diameter/2+0.5, center.y()-diameter/2+0.5, diameter, diameter ) );
            painter.end();

            // store in cache
            _dotCache.insert( key, new QPixmap( pixmap ) );

        }

        p->save();
        p->translate( point - QPoint( 1,1 ) );
        p->setRenderHint( QPainter::Antialiasing );
        p->drawPixmap( QPoint( 0,0 ), pixmap );
        p->restore();

    }

    //____________________________________________________________________
    bool Helper::lowThreshold( const QColor& color )
    {
        const quint32 key( colorKey(color) );
        ColorMap::iterator iter( _lowThreshold.find( key ) );
        if( iter != _lowThreshold.end() ) return iter.value();
        else {

            const QColor darker( KColorScheme::shade( color, KColorScheme::MidShade, 0.5 ) );
            const bool result( KColorUtils::luma( darker ) > KColorUtils::luma( color ) );
            _lowThreshold.insert( key, result );
            return result;

        }

    }

    //____________________________________________________________________
    bool Helper::highThreshold( const QColor& color )
    {
        const quint32 key( colorKey(color) );
        ColorMap::iterator iter( _highThreshold.find( key ) );
        if( iter != _highThreshold.end() ) return iter.value();
        else {

            const QColor lighter( KColorScheme::shade( color, KColorScheme::LightShade, 0.5 ) );
            const bool result( KColorUtils::luma( lighter ) < KColorUtils::luma( color ) );
            _highThreshold.insert( key, result );
            return result;

        }
    }

    //____________________________________________________________________
    QColor Helper::alphaColor( QColor color, qreal alpha )
    {
        if( alpha >= 0 && alpha < 1.0 )
        { color.setAlphaF( alpha*color.alphaF() ); }
        return color;
    }

    //____________________________________________________________________
    QColor Helper::backgroundRadialColor( const QColor& color )
    {
        const quint64 key( colorKey(color) );
        if( QColor* cachedColor = _backgroundRadialColorCache.object( key ) )
        { return *cachedColor; }

        QColor out;
        if( lowThreshold( color ) ) out = KColorScheme::shade( color, KColorScheme::LightShade, 0.0 );
        else if( highThreshold( color ) ) out = color;
        else out = KColorScheme::shade( color, KColorScheme::LightShade, _bgcontrast );

        _backgroundRadialColorCache.insert( key, new QColor( out ) );

        return out;
    }

    //_________________________________________________________________________
    QColor Helper::backgroundTopColor( const QColor& color )
    {
        const quint64 key( colorKey(color) );
        if( QColor* cachedColor = _backgroundTopColorCache.object( key ) )
        { return *cachedColor; }

        QColor out;
        if( lowThreshold( color ) ) out = KColorScheme::shade( color, KColorScheme::MidlightShade, 0.0 );
        else {
            const qreal my( KColorUtils::luma( KColorScheme::shade( color, KColorScheme::LightShade, 0.0 ) ) );
            const qreal by( KColorUtils::luma( color ) );
            out = KColorUtils::shade( color, ( my - by ) * _bgcontrast );
        }

        _backgroundTopColorCache.insert( key, new QColor( out ) );

        return out;
    }

    //_________________________________________________________________________
    QColor Helper::backgroundBottomColor( const QColor& color )
    {
        const quint64 key( colorKey(color) );
        if( QColor* cachedColor = _backgroundBottomColorCache.object( key ) )
        { return *cachedColor; }

        QColor out;
        const QColor midColor( KColorScheme::shade( color, KColorScheme::MidShade, 0.0 ) );
        if( lowThreshold( color ) ) out = midColor;
        else {

            const qreal by( KColorUtils::luma( color ) );
            const qreal my( KColorUtils::luma( midColor ) );
            out = KColorUtils::shade( color, ( my - by ) * _bgcontrast );

        }

        _backgroundBottomColorCache.insert( key, new QColor( out ) );

        return out;

    }

    //____________________________________________________________________
    QColor Helper::calcLightColor( const QColor& color )
    {
        const quint64 key( colorKey(color) );
        if( QColor* cachedColor = _lightColorCache.object( key ) )
        { return *cachedColor; }

        QColor out = highThreshold( color ) ? color: KColorScheme::shade( color, KColorScheme::LightShade, _contrast );
        _lightColorCache.insert( key, new QColor( out ) );

        return out;

    }

    //____________________________________________________________________
    QColor Helper::calcDarkColor( const QColor& color )
    {
        const quint64 key( colorKey(color) );
        if( QColor* cachedColor = _darkColorCache.object( key ) )
        { return *cachedColor; }

        QColor out = ( lowThreshold( color ) ) ?
            KColorUtils::mix( calcLightColor( color ), color, 0.3 + 0.7 * _contrast ):
            KColorScheme::shade( color, KColorScheme::MidShade, _contrast );
        _darkColorCache.insert( key, new QColor( out ) );

        return out;
    }

    //____________________________________________________________________
    QColor Helper::calcShadowColor( const QColor& color )
    {

        const quint64 key( colorKey(color) );
        if( QColor* cachedColor = _shadowColorCache.object( key ) )
        { return *cachedColor; }

        QColor out = ( lowThreshold( color ) ) ?
            KColorUtils::mix( Qt::black, color, color.alphaF() ) :
            KColorScheme::shade(
            KColorUtils::mix( Qt::black, color, color.alphaF() ),
            KColorScheme::ShadowShade,
            _contrast );

        // make sure shadow color has the same alpha channel as the input
        out.setAlpha( color.alpha() );

        // insert in cache
        _shadowColorCache.insert( key, new QColor( out ) );

        return out;

    }

    //____________________________________________________________________
    QColor Helper::backgroundColor( const QColor& color, qreal ratio )
    {

        const quint64 key( ( colorKey(color) << 32 ) | int( ratio*512 ) );
        if( QColor* cachedColor = _backgroundColorCache.object( key ) )
        { return *cachedColor; }

        QColor out;
        if( ratio < 0.5 )
        {

            const qreal a( 2.0*ratio );
            out = KColorUtils::mix( backgroundTopColor( color ), color, a );

        } else {

            const qreal a( 2.0*ratio-1 );
            out = KColorUtils::mix( color, backgroundBottomColor( color ), a );

        }

        _backgroundColorCache.insert( key, new QColor( out ) );

        return out;

    }


    //____________________________________________________________________
    QPixmap Helper::verticalGradient( const QColor& color, int height, int offset )
    {
        const quint64 key( ( colorKey(color) << 32 ) | height | 0x8000 );

        if( QPixmap* cachedPixmap = _backgroundCache.object( key ) )
        { return *cachedPixmap; }

        QPixmap pixmap( 1, height );
        pixmap.fill( Qt::transparent );

        QLinearGradient gradient( 0, offset, 0, height );
        gradient.setColorAt( 0.0, backgroundTopColor( color ) );
        gradient.setColorAt( 0.5, color );
        gradient.setColorAt( 1.0, backgroundBottomColor( color ) );

        QPainter painter( &pixmap );
        painter.fillRect( pixmap.rect(), gradient );

        painter.end();

        _backgroundCache.insert( key, new QPixmap( pixmap ) );
        return pixmap;
    }

    //____________________________________________________________________
    QPixmap Helper::radialGradient( const QColor& color, int width, int height )
    {
        const quint64 key( ( colorKey(color) << 32 ) | width | 0xb000 );

        if( QPixmap* cachedPixmap = _backgroundCache.object( key ) )
        { return *cachedPixmap; }

        QPixmap pixmap( width, height );
        pixmap.fill( Qt::transparent );

        QRadialGradient gradient( 64, height-64, 64 );
        QColor radialColor = backgroundRadialColor( color );
        radialColor.setAlpha( 255 ); gradient.setColorAt( 0, radialColor );
        radialColor.setAlpha( 101 ); gradient.setColorAt( 0.5, radialColor );
        radialColor.setAlpha( 37 );  gradient.setColorAt( 0.75, radialColor );
        radialColor.setAlpha( 0 );   gradient.setColorAt( 1, radialColor );

        QPainter painter( &pixmap );
        painter.setWindow( 0, 0, 128, height );
        painter.fillRect( QRect( 0,0,128,height ), gradient );

        painter.end();

        _backgroundCache.insert( key, new QPixmap( pixmap ) );

        return pixmap;
    }

    //____________________________________________________________________________________
    QColor Helper::decoColor( const QColor& background, const QColor& color )
    {
        const quint64 key( ( colorKey(background) << 32 ) | colorKey(color) );
        if( QColor* cachedColor = _decoColorCache.object( key ) )
        { return *cachedColor; }

        QColor out = KColorUtils::mix( background, color, 0.8*( 1.0 + _contrast ) );
        _decoColorCache.insert( key, new QColor( out ) );

        return out;
    }

    //_______________________________________________________________________
    QRegion Helper::roundedMask( const QRect& rect, int left, int right, int top, int bottom ) const
    {
        // get rect geometry
        int x, y, w, h;
        rect.getRect( &x, &y, &w, &h );

        QRegion mask( x + 4*left, y + 0*top, w-4*( left+right ), h-0*( top+bottom ) );
        mask += QRegion( x + 0*left, y + 4*top, w-0*( left+right ), h-4*( top+bottom ) );
        mask += QRegion( x + 2*left, y + 1*top, w-2*( left+right ), h-1*( top+bottom ) );
        mask += QRegion( x + 1*left, y + 2*top, w-1*( left+right ), h-2*( top+bottom ) );

        return mask;
    }

    //______________________________________________________________________________
    QBitmap Helper::roundedMask( const QSize& size, Corners corners, qreal radius ) const
    {
        QBitmap bitmap( highDpiPixmap( size ) );
        if( corners == 0 )
        {

            bitmap.fill( Qt::color1 );

        } else {

            // initialize bitmap
            bitmap.fill( Qt::color0 );

            // setup painter
            QPainter painter( &bitmap );
            painter.setPen( Qt::NoPen );
            painter.setBrush( Qt::color1 );

            // get path
            const QPainterPath path( roundedPath( bitmap.rect(), corners, radius ) );
            painter.drawPath( path );

        }

        return bitmap;
    }

    //______________________________________________________________________________
    QPainterPath Helper::roundedPath( const QRect& rect, Corners corners, qreal radius ) const
    {

        QPainterPath path;

        // simple cases
        if( corners == 0 )
        {

            path.addRect( rect );
            return path;

        }

        if( corners == AllCorners ) {

            path.addRoundedRect( rect, radius, radius );
            return path;

        }

        const QSizeF cornerSize( 2*radius, 2*radius );

        // rotate counterclockwise
        // top left corner
        if( corners & CornerTopLeft )
        {

            path.moveTo( rect.topLeft() + QPointF( radius, 0 ) );
            path.arcTo( QRectF( rect.topLeft(), cornerSize ), 90, 90 );

        } else path.moveTo( rect.topLeft() );

        // bottom left corner
        if( corners & CornerBottomLeft )
        {

            path.lineTo( rect.bottomLeft() - QPointF( 0, radius ) );
            path.arcTo( QRectF( rect.bottomLeft() - QPointF( 0, 2*radius ), cornerSize ), 180, 90 );

        } else path.lineTo( rect.bottomLeft() );

        // bottom right corner
        if( corners & CornerBottomRight )
        {

            path.lineTo( rect.bottomRight() - QPointF( radius, 0 ) );
            path.arcTo( QRectF( rect.bottomRight() - QPointF( 2*radius, 2*radius ), cornerSize ), 270, 90 );

        } else path.lineTo( rect.bottomRight() );

        // top right corner
        if( corners & CornerTopRight )
        {

            path.lineTo( rect.topRight() + QPointF( 0, radius ) );
            path.arcTo( QRectF( rect.topRight() - QPointF( 2*radius, 0 ), cornerSize ), 0, 90 );

        } else path.lineTo( rect.topRight() );

        path.closeSubpath();
        return path;

    }

    //______________________________________________________________________
    void Helper::drawFloatFrame(
        QPainter* p, const QRect r,
        const QColor& color,
        bool drawUglyShadow, bool isActive, const QColor& frameColor, TileSet::Tiles tiles )
    {

        p->save();
        p->setRenderHint( QPainter::Antialiasing );
        const QRect frame( r.adjusted( 1,1,-1,-1 ) );
        int x,y,w,h;
        frame.getRect( &x, &y, &w, &h );

        QColor light( calcLightColor( backgroundTopColor( color ) ) );
        QColor dark( calcLightColor( backgroundBottomColor( color ) ) );
        p->setBrush( Qt::NoBrush );

        if ( drawUglyShadow )
        {

            if( isActive )
            {
                //window active - it's a glow - not a shadow
                const QColor glow( KColorUtils::mix( QColor( 128,128,128 ), frameColor, 0.7 ) );
                p->setPen( glow );

                if( tiles & TileSet::Top )
                {
                    p->drawLine( QPointF( x+4, y-0.5 ), QPointF( x+w-4, y-0.5 ) );
                    p->drawArc( QRectF( x-0.5, y-0.5, 11, 11 ),90*16, 90*16 );
                    p->drawArc( QRectF( x+w-11+0.5, y-0.5, 11, 11 ), 0, 90*16 );
                }

                if( tiles & TileSet::Left ) p->drawLine( QPointF( x-0.5, y+4 ), QPointF( x-0.5, y+h-4 ) );
                if( tiles & TileSet::Right ) p->drawLine( QPointF( x+w+0.5, y+4 ), QPointF( x+w+0.5, y+h-4 ) );

                if( tiles & TileSet::Bottom )
                {
                    if( tiles & TileSet::Left ) p->drawArc( QRectF( x-0.5, y+h-11+0.5, 11, 11 ),180*16, 90*16 );
                    if( tiles & TileSet::Right ) p->drawArc( QRectF( x+w-11+0.5, y+h-11+0.5, 11, 11 ),270*16, 90*16 );
                    p->drawLine( QPointF( x+4, y+h+0.5 ), QPointF( x+w-4, y+h+0.5 ) );
                }

                light = KColorUtils::mix( light, frameColor );
                dark = KColorUtils::mix( dark, frameColor );

            } else {

                // window inactive - draw something resembling shadow
                // fully desaturate
                const QColor shadow( KColorUtils::darken( color, 0.0, 0.0 ) );

                if( tiles & TileSet::Top )
                {
                    p->setPen( KColorUtils::darken( shadow, 0.2 ) );
                    p->drawLine( QPointF( x+4, y-0.5 ), QPointF( x+w-4, y-0.5 ) );
                    if( tiles & TileSet::Left ) p->drawArc( QRectF( x-0.5, y-0.5, 11, 11 ),90*16, 90*16 );
                    if( tiles & TileSet::Right ) p->drawArc( QRectF( x+w-11+0.5, y-0.5, 11, 11 ), 0, 90*16 );
                }

                p->setPen( KColorUtils::darken( shadow, 0.35 ) );
                if( tiles & TileSet::Left ) p->drawLine( QPointF( x-0.5, y+4 ), QPointF( x-0.5, y+h-4 ) );
                if( tiles & TileSet::Right ) p->drawLine( QPointF( x+w+0.5, y+4 ), QPointF( x+w+0.5, y+h-4 ) );

                if( tiles & TileSet::Bottom )
                {

                    p->setPen( KColorUtils::darken( shadow, 0.45 ) );
                    if( tiles & TileSet::Left ) p->drawArc( QRectF( x-0.5, y+h-11+0.5, 11, 11 ),180*16, 90*16 );
                    if( tiles & TileSet::Right ) p->drawArc( QRectF( x+w-11+0.5, y+h-11+0.5, 11, 11 ),270*16, 90*16 );
                    p->setPen( KColorUtils::darken( shadow, 0.6 ) );
                    p->drawLine( QPointF( x+4, y+h+0.5 ), QPointF( x+w-4, y+h+0.5 ) );

                }

            }
        }

        // top frame
        if( tiles & TileSet::Top )
        {
            p->setPen( QPen( light, 0.8 ) );
            p->drawLine( QPointF( x+4, y+0.6 ), QPointF( x+w-4, y+0.6 ) );
        }

        // corner and side frames
        // sides are drawn even if Top only is selected, but with a different gradient
        if( h >= 4+1.5 )
        {
            QLinearGradient lg( 0.0, y+1.5, 0.0, y+h-4 );
            lg.setColorAt( 0, light );
            lg.setColorAt( 1, alphaColor( light, 0 ) );

            if( h > 20.5 ) lg.setColorAt( qMax( 0.0, 1.0 - 12.0/( h-5.5 ) ), alphaColor( light, 0.5 ) );
            else if( h > 8.5 ) lg.setColorAt( qMax( 0.0, 3.0/( h-5.5 ) ), alphaColor( light, 0.5 ) );

            p->setPen( QPen( lg, 0.8 ) );
            if( tiles & TileSet::Left ) p->drawLine( QPointF( x+0.6, y+4 ), QPointF( x+0.6, y+h-4 ) );
            if( tiles & TileSet::Right ) p->drawLine( QPointF( x+w-0.6, y+4 ), QPointF( x+w-0.6, y+h-4 ) );
        }

        if( tiles & TileSet::Top )
        {
            const qreal offset = 0.5;
            const qreal arc( 7.0 );
            p->drawArc( QRectF( x+offset, y+offset, arc, arc ),90*16, 90*16 );
            p->drawArc( QRectF( x+w-arc-offset, y+offset, arc, arc ), 0, 90*16 );
        }

        p->restore();

    }

    //______________________________________________________________________________________
    void Helper::drawSeparator( QPainter* p, const QRect& rect, const QColor& color, Qt::Orientation orientation )
    {

        QColor light( calcLightColor( color ) );
        QColor dark( calcDarkColor( color ) );

        p->save();
        p->setRenderHint( QPainter::Antialiasing,false );

        QPoint start,end,offset;
        if ( orientation == Qt::Horizontal )
        {

            start = QPoint( rect.x(),rect.y()+rect.height()/2-1 );
            end = QPoint( rect.right(),rect.y()+rect.height()/2-1 );
            offset = QPoint( 0,1 );

        } else {

            start = QPoint( rect.x()+rect.width()/2-1,rect.y() );
            end = QPoint( rect.x()+rect.width()/2-1,rect.bottom() );
            offset = QPoint( 1,0 );
            light.setAlpha( 150 );

        }

        QLinearGradient lg( start,end );
        lg.setColorAt( 0.3, dark );
        lg.setColorAt( 0.7, dark );
        dark.setAlpha( 0 );
        lg.setColorAt( 0.0, dark );
        lg.setColorAt( 1.0, dark );
        p->setPen( QPen( lg,1 ) );

        if ( orientation == Qt::Horizontal ) p->drawLine( start,end );
        else p->drawLine( start+offset,end+offset );

        lg = QLinearGradient( start,end );
        lg.setColorAt( 0.3, light );
        lg.setColorAt( 0.7, light );
        light.setAlpha( 0 );
        lg.setColorAt( 0.0, light );
        lg.setColorAt( 1.0, light );
        p->setPen( QPen( lg,1 ) );

        if ( orientation == Qt::Horizontal ) p->drawLine( start+offset,end+offset );
        else
        {
            p->drawLine( start,end );
            p->drawLine( start+offset*2,end+offset*2 );
        }

        p->restore();
    }

    //____________________________________________________________________
    const QWidget* Helper::checkAutoFillBackground( const QWidget* w ) const
    {
        if( !w ) return nullptr;
        if( w->autoFillBackground() ) return w;
        if( w->isWindow() ) return 0;

        for( const QWidget* parent = w->parentWidget(); parent!=0; parent = parent->parentWidget() )
        {
            if( parent->autoFillBackground() ) return parent;
            if( parent == w->window() ) break;
        }

        return nullptr;
    }

    //____________________________________________________________________
    void Helper::setHasBackgroundGradient( WId id, bool value ) const
    {

        #if OXYGEN_HAVE_X11
        setHasHint( id, _backgroundGradientAtom, value );
        #else
        Q_UNUSED( id );
        Q_UNUSED( value );
        #endif
        return;
    }

    //____________________________________________________________________
    bool Helper::hasBackgroundGradient( WId id ) const
    {

        #if OXYGEN_HAVE_X11
        return hasHint( id, _backgroundGradientAtom );
        #else
        Q_UNUSED( id );
        return false;
        #endif
    }

    //______________________________________________________________________________________
    QPixmap Helper::highDpiPixmap( int width, int height ) const
    {
        #if QT_VERSION >= 0x050300
        const qreal dpiRatio( qApp->devicePixelRatio() );
        QPixmap pixmap( width*dpiRatio, height*dpiRatio );
        pixmap.setDevicePixelRatio( dpiRatio );
        return pixmap;
        #else
        return QPixmap( width, height );
        #endif
    }

    //______________________________________________________________________________________
    qreal Helper::devicePixelRatio( const QPixmap& pixmap ) const
    {
        #if QT_VERSION >= 0x050300
        return pixmap.devicePixelRatio();
        #else
        Q_UNUSED(pixmap);
        return 1;
        #endif
    }

    //______________________________________________________________________________
    bool Helper::isX11( void )
    {
        #if OXYGEN_HAVE_X11
        #if QT_VERSION >= 0x050000
        static const bool s_isX11 = QX11Info::isPlatformX11();
        return s_isX11;
        #else
        return true;
        #endif
        #endif

        return false;

    }

    bool Helper::isWayland( void )
    {
        #if QT_VERSION >= 0x050000
        static const bool s_isWayland = qApp->platformName().startsWith(QLatin1String("wayland"));
        return s_isWayland;
        #else
        return false;
        #endif
    }

    #if OXYGEN_HAVE_X11

    //____________________________________________________________________
    xcb_connection_t* Helper::connection( void )
    {

        #if QT_VERSION >= 0x050000
        return QX11Info::connection();
        #else
        static xcb_connection_t* connection = nullptr;
        if( !connection )
        {
            Display* display = QX11Info::display();
            if( display ) connection = XGetXCBConnection( display );
        }
        return connection;
        #endif
    }

    //____________________________________________________________________
    xcb_atom_t Helper::createAtom( const QString& name ) const
    {
        if( !isX11() ) return 0;
        xcb_intern_atom_cookie_t cookie( xcb_intern_atom( connection(), false, name.size(), qPrintable( name ) ) );
        ScopedPointer<xcb_intern_atom_reply_t> reply( xcb_intern_atom_reply( connection(), cookie, nullptr) );
        return reply ? reply->atom:0;
    }

    #endif

    //___________________________________________________________________________________________
    void Helper::drawShadow( QPainter& painter, const QColor& color, int size )
    {
        const qreal m( qreal( size-2 )*0.5 );
        const qreal offset( 0.8 );
        const qreal k0( ( m-4.0 ) / m );

        QRadialGradient shadowGradient( m+1.0, m+offset+1.0, m );
        for ( int i = 0; i < 8; i++ )
        {

            // sinusoidal gradient
            const qreal k1( ( k0 * qreal( 8 - i ) + qreal( i ) ) * 0.125 );
            const qreal a( ( cos( M_PI * i * 0.125 ) + 1.0 ) * 0.30 );
            shadowGradient.setColorAt( k1, alphaColor( color, a * _shadowGain ) );

        }

        shadowGradient.setColorAt( 1.0, alphaColor( color, 0.0 ) );
        painter.save();
        painter.setBrush( shadowGradient );
        painter.drawEllipse( QRectF( 0, 0, size, size ) );
        painter.restore();

    }

    //_______________________________________________________________________
    void Helper::drawOuterGlow( QPainter& painter, const QColor& color, int size )
    {

        const QRectF r( 0, 0, size, size );
        const qreal m( qreal( size )*0.5 );
        const qreal width( 3 );

        const qreal bias( _glowBias * qreal( 14 )/size );

        // k0 is located at width - bias from the outer edge
        const qreal gm( m + bias - 0.9 );
        const qreal k0( ( m-width+bias ) / gm );
        QRadialGradient glowGradient( m, m, gm );
        for ( int i = 0; i < 8; i++ )
        {

            // k1 grows linearly from k0 to 1.0
            const qreal k1( k0 + qreal( i )*( 1.0-k0 )/8.0 );

            // a folows sqrt curve
            const qreal a( 1.0 - sqrt( qreal( i )/8 ) );
            glowGradient.setColorAt( k1, alphaColor( color, a ) );
        }

        // glow
        painter.save();
        painter.setBrush( glowGradient );
        painter.drawEllipse( r );

        // inside mask
        painter.setCompositionMode( QPainter::CompositionMode_DestinationOut );
        painter.setBrush( Qt::black );
        painter.drawEllipse( r.adjusted( width+0.5, width+0.5, -width-1, -width-1 ) );
        painter.restore();

    }

    #if OXYGEN_HAVE_X11

    //____________________________________________________________________
    void Helper::setHasHint( xcb_window_t id, xcb_atom_t atom, bool value ) const
    {
        if( !isX11() ) return;

        // check window id
        if( !id ) return;

        quint32 uLongValue( value );
        xcb_change_property( connection(), XCB_PROP_MODE_REPLACE, id, atom, XCB_ATOM_CARDINAL, 32, 1, &uLongValue );
        xcb_flush( connection() );
        return;

    }

    //____________________________________________________________________
    bool Helper::hasHint( xcb_window_t id, xcb_atom_t atom ) const
    {
        if( !isX11() ) return false;

        // check window id
        if( !id ) return false;

        xcb_get_property_cookie_t cookie( xcb_get_property( connection(), 0, id, atom, XCB_ATOM_CARDINAL, 0, 1) );
        ScopedPointer<xcb_get_property_reply_t> reply( xcb_get_property_reply( connection(), cookie, nullptr ) );

        return reply && xcb_get_property_value_length( reply.data() ) && reinterpret_cast<int32_t*>(xcb_get_property_value( reply.data() ) )[0];

    }

    #endif


    //____________________________________________________________________
    void Helper::init( void )
    {

        #if OXYGEN_USE_KDE4
        _contrast = KGlobalSettings::contrastF( _config );
        #else
        _contrast = KColorScheme::contrastF( _config );
        #endif

        // background contrast is calculated so that it is 0.9
        // when KGlobalSettings contrast value of 0.7
        _bgcontrast = qMin( 1.0, 0.9*_contrast/0.7 );

        _backgroundCache.setMaxCost( 64 );

        #if OXYGEN_HAVE_X11
        if( isX11() )
        {

            _backgroundGradientAtom = createAtom( QStringLiteral( "_KDE_OXYGEN_BACKGROUND_GRADIENT" ) );

        } else {

            _backgroundGradientAtom = 0;

        }

        #endif

    }

}