summaryrefslogtreecommitdiffstats
path: root/src/kernel/qpaintdevice_x11.cpp
blob: 594165728e6c7cf0d0d82b6e55156004a97f83f7 (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
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
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
/****************************************************************************
**
** Implementation of QPaintDevice class for X11
**
** Created : 940721
**
** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file.  Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/

#include "qpaintdevice.h"
#include "qpaintdevicemetrics.h"
#include "qpainter.h"
#include "qwidget.h"
#include "qbitmap.h"
#include "qapplication.h"
#include "qt_x11_p.h"


/*!
    \class QPaintDevice qpaintdevice.h
    \brief The QPaintDevice class is the base class of objects that
    can be painted.

    \ingroup graphics
    \ingroup images

    A paint device is an abstraction of a two-dimensional space that
    can be drawn using a QPainter. The drawing capabilities are
    implemented by the subclasses QWidget, QPixmap, QPicture and
    QPrinter.

    The default coordinate system of a paint device has its origin
    located at the top-left position. X increases to the right and Y
    increases downward. The unit is one pixel. There are several ways
    to set up a user-defined coordinate system using the painter, for
    example, using QPainter::setWorldMatrix().

    Example (draw on a paint device):
    \code
    void MyWidget::paintEvent( QPaintEvent * )
    {
	QPainter p;                       // our painter
	p.begin( this );                  // start painting the widget
	p.setPen( red );                  // red outline
	p.setBrush( yellow );             // yellow fill
	p.drawEllipse( 10, 20, 100,100 ); // 100x100 ellipse at position (10, 20)
	p.end();                          // painting done
    }
    \endcode

    The bit block transfer is an extremely useful operation for
    copying pixels from one paint device to another (or to itself). It
    is implemented as the global function bitBlt().

    Example (scroll widget contents 10 pixels to the right):
    \code
    bitBlt( myWidget, 10, 0, myWidget );
    \endcode

    \warning Qt requires that a QApplication object exists before
    any paint devices can be created. Paint devices access window
    system resources, and these resources are not initialized before
    an application object is created.
*/


//
// Some global variables - these are initialized by QColor::initialize()
//

Display *QPaintDevice::x_appdisplay = 0;
int	 QPaintDevice::x_appscreen;

int	  QPaintDevice::x_appdepth;
int	  QPaintDevice::x_appcells;
Qt::HANDLE  QPaintDevice::x_approotwindow;
Qt::HANDLE  QPaintDevice::x_appcolormap;
bool	  QPaintDevice::x_appdefcolormap;
void	 *QPaintDevice::x_appvisual;
bool	  QPaintDevice::x_appdefvisual;

// ### in 4.0, remove the above, and use the below
int	 *QPaintDevice::x_appdepth_arr;
int	 *QPaintDevice::x_appcells_arr;
Qt::HANDLE *QPaintDevice::x_approotwindow_arr;
Qt::HANDLE *QPaintDevice::x_appcolormap_arr;
bool	 *QPaintDevice::x_appdefcolormap_arr;
void	**QPaintDevice::x_appvisual_arr;
bool	 *QPaintDevice::x_appdefvisual_arr;

/*!
    \enum QPaintDevice::PDevCmd
    \internal
*/

/*!
    Constructs a paint device with internal flags \a devflags. This
    constructor can be invoked only from QPaintDevice subclasses.
*/

QPaintDevice::QPaintDevice( uint devflags )
{
    if ( !qApp ) {				// global constructor
#if defined(QT_CHECK_STATE)
	qFatal( "QPaintDevice: Must construct a QApplication before a "
		"QPaintDevice" );
#endif
	return;
    }
    devFlags = devflags;
    painters = 0;
    hd = 0;
    rendhd = 0;
    x11Data = 0;
}

/*!
    Destroys the paint device and frees window system resources.
*/

QPaintDevice::~QPaintDevice()
{
#if defined(QT_CHECK_STATE)
    if ( paintingActive() )
	qWarning( "QPaintDevice: Cannot destroy paint device that is being "
		  "painted" );
#endif
    if ( x11Data && x11Data->deref() ) {
	delete x11Data;
	x11Data = 0;
    }
}


/*
  \internal
  Makes a shallow copy of the X11-specific data of \a fromDevice, if it is not
  null. Otherwise this function sets it to null.
*/

void QPaintDevice::copyX11Data( const QPaintDevice *fromDevice )
{
    setX11Data( fromDevice ? fromDevice->x11Data : 0 );
}

/*
  \internal
  Makes a deep copy of the X11-specific data of \a fromDevice, if it is not
  null. Otherwise this function sets it to null.
*/

void QPaintDevice::cloneX11Data( const QPaintDevice *fromDevice )
{
    if ( fromDevice && fromDevice->x11Data ) {
	QPaintDeviceX11Data *d = new QPaintDeviceX11Data;
	*d = *fromDevice->x11Data;
	d->count = 0;
	setX11Data( d );
    } else {
	setX11Data( 0 );
    }
}

/*
  \internal
  Makes a shallow copy of the X11-specific data \a d and assigns it to this
  class. This function increments the reference code of \a d.
*/

void QPaintDevice::setX11Data( const QPaintDeviceX11Data* d )
{
    if ( x11Data && x11Data->deref() )
	delete x11Data;
    x11Data = (QPaintDeviceX11Data*)d;
    if ( x11Data )
	x11Data->ref();
}


/*
  \internal
  If \a def is FALSE, returns a deep copy of the x11Data, or 0 if x11Data is 0.
  If \a def is TRUE, makes a QPaintDeviceX11Data struct filled with the default
  values.

  In either case the caller is responsible for deleting the returned
  struct. But notice that the struct is a shared class, so other
  classes might also have a reference to it. The reference count of
  the returned QPaintDeviceX11Data* is 0.
*/

QPaintDeviceX11Data* QPaintDevice::getX11Data( bool def ) const
{
    QPaintDeviceX11Data* res = 0;
    if ( def ) {
	res = new QPaintDeviceX11Data;
	res->x_display = x11AppDisplay();
	res->x_screen = x11AppScreen();
	res->x_depth = x11AppDepth();
	res->x_cells = x11AppCells();
	res->x_colormap = x11Colormap();
	res->x_defcolormap = x11AppDefaultColormap();
	res->x_visual = x11AppVisual();
	res->x_defvisual = x11AppDefaultVisual();
	res->deref();
    } else if ( x11Data ) {
	res = new QPaintDeviceX11Data;
	*res = *x11Data;
	res->count = 0;
    }
    return res;
}


/*!
    \fn int QPaintDevice::devType() const

    \internal

    Returns the device type identifier, which is \c QInternal::Widget
    if the device is a QWidget, \c QInternal::Pixmap if it's a
    QPixmap, \c QInternal::Printer if it's a QPrinter, \c
    QInternal::Picture if it's a QPicture or \c
    QInternal::UndefinedDevice in other cases (which should never
    happen).
*/

/*!
    \fn bool QPaintDevice::isExtDev() const

    Returns TRUE if the device is an external paint device; otherwise
    returns FALSE.

    External paint devices cannot be bitBlt()'ed from. QPicture and
    QPrinter are external paint devices.
*/

/*!
    Returns the window system handle of the paint device, for
    low-level access. Using this function is not portable.

    The HANDLE type varies with platform; see \c qpaintdevice.h and
    \c qwindowdefs.h for details.

    \sa x11Display()
*/
Qt::HANDLE QPaintDevice::handle() const
{
    return hd;
}

/*!
    Returns the window system handle of the paint device for XRender
    support. Use of this function is not portable. This function will
    return 0 if XRender support is not compiled into Qt, if the
    XRender extension is not supported on the X11 display, or if the
    handle could not be created.
*/
Qt::HANDLE QPaintDevice::x11RenderHandle() const
{
#ifndef QT_NO_XFTFREETYPE
    return rendhd ? XftDrawPicture( (XftDraw *) rendhd ) : 0;
#else
    return 0;
#endif // QT_NO_XFTFREETYPE
}


/*!
    \fn Display *QPaintDevice::x11AppDisplay()

    Returns a pointer to the X display global to the application (X11
    only). Using this function is not portable.

    \sa handle()
*/

/*!
    \fn int QPaintDevice::x11AppScreen()

    Returns the screen number on the X display global to the
    application (X11 only). Using this function is not portable.
*/

/*!
    \overload
    \fn int QPaintDevice::x11AppDepth()

    Returns the depth for the default screen of the X display global
    to the application (X11 only). Using this function is not
    portable.

    \sa QPixmap::defaultDepth()
*/

/*!
    \fn int QPaintDevice::x11AppCells()

    Returns the number of entries in the colormap for the default
    screen of the X display global to the application (X11
    only). Using this function is not portable.

    \sa x11Colormap()
*/

/*!
    \fn HANDLE QPaintDevice::x11AppRootWindow()

    Returns the root window for the default screen of the X display
    global to the applicatoin (X11 only). Using this function is not
    portable.
*/

/*!
    \fn HANDLE QPaintDevice::x11AppColormap()

    Returns the colormap for the default screen of the X display
    global to the application (X11 only). Using this function is not
    portable.

    \sa x11Cells()
*/

/*!
    \fn bool QPaintDevice::x11AppDefaultColormap ()

    Returns the default colormap for the default screen of the X
    display global to the application (X11 only). Using this function
    is not portable.

    \sa x11Cells()
*/

/*!
    \fn void* QPaintDevice::x11AppVisual ()

    Returns the Visual for the default screen of the X display global
    to the application (X11 only). Using this function is not
    portable.
*/

/*!
    \fn bool QPaintDevice::x11AppDefaultVisual ()

    Returns TRUE if the Visual used is the default for the default
    screen of the X display global to the application (X11 only);
    otherwise returns FALSE. Using this function is not portable.
*/

/*!
    \fn int QPaintDevice::x11AppDepth( int screen )

    Returns the depth for screen \a screen of the X display global to
    the application (X11 only). Using this function is not portable.

    \sa QPixmap::defaultDepth()
*/

/*!
    \overload
    \fn int QPaintDevice::x11AppCells( int screen )

    Returns the number of entries in the colormap for screen \a screen
    of the X display global to the application (X11 only). Using this
    function is not portable.

    \sa x11Colormap()
*/

/*!
    \overload
    \fn HANDLE QPaintDevice::x11AppRootWindow( int screen )

    Returns the root window for screen \a screen of the X display
    global to the applicatoin (X11 only). Using this function is not
    portable.
*/

/*!
    \overload
    \fn HANDLE QPaintDevice::x11AppColormap( int screen )

    Returns the colormap for screen \a screen of the X display global
    to the application (X11 only). Using this function is not
    portable.

    \sa x11Cells()
*/

/*!
    \overload
    \fn bool QPaintDevice::x11AppDefaultColormap( int screen )

    Returns the default colormap for screen \a screen of the X display
    global to the application (X11 only). Using this function is not
    portable.

    \sa x11Cells()
*/

/*!
    \overload
    \fn void* QPaintDevice::x11AppVisual( int screen )

    Returns the Visual for screen \a screen of the X display global to
    the application (X11 only). Using this function is not portable.
*/

/*!
    \overload
    \fn bool QPaintDevice::x11AppDefaultVisual( int screen )

    Returns TRUE if the Visual used is the default for screen
    \a screen of the X display global to the application (X11 only);
    otherwise returns FALSE. Using this function is not portable.
*/


/*!
    \fn Display *QPaintDevice::x11Display() const

    Returns a pointer to the X display for the paint device (X11
    only). Using this function is not portable.

    \sa handle()
*/

/*!
    \fn int QPaintDevice::x11Screen () const

    Returns the screen number on the X display for the paint device
    (X11 only). Using this function is not portable.
*/

/*!
    \fn int QPaintDevice::x11Depth () const

    Returns the depth of the X display for the paint device (X11
    only). Using this function is not portable.

    \sa QPixmap::defaultDepth()
*/

/*!
    \fn int QPaintDevice::x11Cells () const

    Returns the number of entries in the colormap of the X display for
    the paint device (X11 only). Using this function is not portable.

    \sa x11Colormap()
*/

/*!
    \fn HANDLE QPaintDevice::x11Colormap () const

    Returns the colormap of the X display for the paint device (X11
    only). Using this function is not portable.

    \sa x11Cells()
*/

/*!
    \fn bool QPaintDevice::x11DefaultColormap () const

    Returns the default colormap of the X display for the paint device
    (X11 only). Using this function is not portable.

    \sa x11Cells()
*/

/*!
    \fn void* QPaintDevice::x11Visual () const

    Returns the Visual of the X display for the paint device (X11
    only). Using this function is not portable.
*/

/*!
    \fn bool QPaintDevice::x11DefaultVisual () const

    Returns the default Visual of the X display for the paint device
    (X11 only). Using this function is not portable.
*/

static int *dpisX=0, *dpisY=0;
static void create_dpis()
{
    if ( dpisX )
	return;

    Display *dpy = QPaintDevice::x11AppDisplay();
    if ( ! dpy )
	return;

    int i, screens =  ScreenCount( dpy );
    dpisX = new int[ screens ];
    dpisY = new int[ screens ];
    Q_CHECK_PTR( dpisX );
    Q_CHECK_PTR( dpisY );
    for ( i = 0; i < screens; i++ ) {
       if (DisplayWidthMM(dpy,i) < 1)
               dpisX[ i ] = 75; // default the dpi to 75.
       else
               dpisX[ i ] = (DisplayWidth(dpy,i) * 254 + DisplayWidthMM(dpy,i)*5)
                     / (DisplayWidthMM(dpy,i)*10);
       if (DisplayHeightMM(dpy,i) < 1)
               dpisY[ i ] = 75; // default the dpi to 75.
       else
               dpisY[ i ] = (DisplayHeight(dpy,i) * 254 + DisplayHeightMM(dpy,i)*5)
                     / (DisplayHeightMM(dpy,i)*10);
    }
}

/*!
    Sets the value returned by x11AppDpiX() to \a dpi for screen
    \a screen. The default is determined by the display configuration.
    Changing this value will alter the scaling of fonts and many other
    metrics and is not recommended. Using this function is not
    portable.

    \sa x11SetAppDpiY()
*/
void QPaintDevice::x11SetAppDpiX(int dpi, int screen)
{
    create_dpis();
    if ( ! dpisX )
	return;
    if ( screen < 0 )
	screen = QPaintDevice::x11AppScreen();
    if ( screen > ScreenCount( QPaintDevice::x11AppDisplay() ) )
	return;
    dpisX[ screen ] = dpi;
}

/*!
    \overload

    Sets the value returned by x11AppDpiX() to \a dpi for the default
    screen. The default is determined by the display configuration.
    Changing this value will alter the scaling of fonts and many other
    metrics and is not recommended. Using this function is not
    portable.

*/
// ### REMOVE 4.0
void QPaintDevice::x11SetAppDpiX( int dpi )
{
    QPaintDevice::x11SetAppDpiX( dpi, -1 );
}

/*!
    Sets the value returned by x11AppDpiY() to \a dpi for screen
    \a screen. The default is determined by the display configuration.
    Changing this value will alter the scaling of fonts and many other
    metrics and is not recommended. Using this function is not
    portable.

    \sa x11SetAppDpiX()
*/
void QPaintDevice::x11SetAppDpiY(int dpi, int screen)
{
    create_dpis();
    if ( ! dpisY )
	return;
    if ( screen < 0 )
	screen = QPaintDevice::x11AppScreen();
    if ( screen > ScreenCount( QPaintDevice::x11AppDisplay() ) )
	return;
    dpisY[ screen ] = dpi;
}

/*!
    \overload

    Sets the value returned by x11AppDpiY() to \a dpi for the default
    screen.  The default is determined by the display configuration.
    Changing this value will alter the scaling of fonts and many other
    metrics and is not recommended. Using this function is not
    portable.
*/
// ### REMOVE 4.0
void QPaintDevice::x11SetAppDpiY( int dpi )
{
    QPaintDevice::x11SetAppDpiY( dpi, -1 );
}

/*!
    Returns the horizontal DPI of the X display (X11 only) for screen
    \a screen. Using this function is not portable. See
    QPaintDeviceMetrics for portable access to related information.
    Using this function is not portable.

    \sa x11AppDpiY(), x11SetAppDpiX(), QPaintDeviceMetrics::logicalDpiX()
*/
int QPaintDevice::x11AppDpiX(int screen)
{
    create_dpis();
    if ( ! dpisX )
	return 0;
    if ( screen < 0 )
	screen = QPaintDevice::x11AppScreen();
    if ( screen > ScreenCount( QPaintDevice::x11AppDisplay() ) )
	return 0;
    return dpisX[ screen ];
}

/*!
    \overload

    Returns the horizontal DPI of the X display (X11 only) for the
    default screen. Using this function is not portable. See
    QPaintDeviceMetrics for portable access to related information.
    Using this function is not portable.
*/
int QPaintDevice::x11AppDpiX()
{
    return QPaintDevice::x11AppDpiX( -1 );
}

/*!
    Returns the vertical DPI of the X11 display (X11 only) for screen
    \a screen.  Using this function is not portable. See
    QPaintDeviceMetrics for portable access to related information.
    Using this function is not portable.

    \sa x11AppDpiX(), x11SetAppDpiY(), QPaintDeviceMetrics::logicalDpiY()
*/
int QPaintDevice::x11AppDpiY( int screen )
{
    create_dpis();
    if ( ! dpisY )
	return 0;
    if ( screen < 0 )
	screen = QPaintDevice::x11AppScreen();
    if ( screen > ScreenCount( QPaintDevice::x11AppDisplay() ) )
	return 0;
    return dpisY[ screen ];
}

/*!
    \overload

    Returns the vertical DPI of the X11 display (X11 only) for the
    default screen.  Using this function is not portable. See
    QPaintDeviceMetrics for portable access to related information.
    Using this function is not portable.

    \sa x11AppDpiX(), x11SetAppDpiY(), QPaintDeviceMetrics::logicalDpiY()
*/
int QPaintDevice::x11AppDpiY()
{
    return QPaintDevice::x11AppDpiY( -1 );
}

/*!
    \fn bool QPaintDevice::paintingActive() const

    Returns TRUE if the device is being painted, i.e. someone has
    called QPainter::begin() but not yet called QPainter::end() for
    this device; otherwise returns FALSE.

    \sa QPainter::isActive()
*/

/*!
    Internal virtual function that interprets drawing commands from
    the painter.

    Implemented by subclasses that have no direct support for drawing
    graphics (external paint devices, for example, QPicture).
*/

bool QPaintDevice::cmd( int, QPainter *, QPDevCmdParam * )
{
#if defined(QT_CHECK_STATE)
    qWarning( "QPaintDevice::cmd: Device has no command interface" );
#endif
    return FALSE;
}

/*!
    \internal

    Internal virtual function that returns paint device metrics.

    Please use the QPaintDeviceMetrics class instead.
*/

int QPaintDevice::metric( int ) const
{
#if defined(QT_CHECK_STATE)
    qWarning( "QPaintDevice::metrics: Device has no metric information" );
#endif
    return 0;
}

/*!
    \internal

    Internal virtual function. Reserved for future use.

    Please use the QFontMetrics class instead.
*/

int QPaintDevice::fontMet( QFont *, int, const char *, int ) const
{
    return 0;
}

/*!
    \internal

    Internal virtual function. Reserved for future use.

    Please use the QFontInfo class instead.
*/

int QPaintDevice::fontInf( QFont *, int ) const
{
    return 0;
}


//
// Internal functions for simple GC caching for blt'ing masked pixmaps.
// This cache is used when the pixmap optimization is set to Normal
// and the pixmap size doesn't exceed 128x128.
//

static bool      init_mask_gc = FALSE;
static const int max_mask_gcs = 11;		// suitable for hashing

struct mask_gc {
    GC	gc;
    int mask_no;
};

static mask_gc gc_vec[max_mask_gcs];


static void cleanup_mask_gc()
{
    Display *dpy = QPaintDevice::x11AppDisplay();
    init_mask_gc = FALSE;
    for ( int i=0; i<max_mask_gcs; i++ ) {
	if ( gc_vec[i].gc )
	    XFreeGC( dpy, gc_vec[i].gc );
    }
}

static GC cache_mask_gc( Display *dpy, Drawable hd, int mask_no, Pixmap mask )
{
    if ( !init_mask_gc ) {			// first time initialization
	init_mask_gc = TRUE;
	qAddPostRoutine( cleanup_mask_gc );
	for ( int i=0; i<max_mask_gcs; i++ )
	    gc_vec[i].gc = 0;
    }
    mask_gc *p = &gc_vec[mask_no % max_mask_gcs];
    if ( !p->gc || p->mask_no != mask_no ) {	// not a perfect match
	if ( !p->gc ) {				// no GC
	    p->gc = XCreateGC( dpy, hd, 0, 0 );
	    XSetGraphicsExposures( dpy, p->gc, False );
	}
	XSetClipMask( dpy, p->gc, mask );
	p->mask_no = mask_no;
    }
    return p->gc;
}


/*!
    \relates QPaintDevice

    Copies a block of pixels from \a src to \a dst, perhaps merging
    each pixel according to the \link Qt::RasterOp raster operation \endlink
    \a rop. \a sx, \a sy
    is the top-left pixel in \a src (0, 0) by default, \a dx, \a dy is
    the top-left position in \a dst and \a sw, \a sh is the size of
    the copied block (all of \a src by default).

    The most common values for \a rop are CopyROP and XorROP; the \l
    Qt::RasterOp documentation defines all the possible values.

    If \a ignoreMask is FALSE (the default) and \a src is a
    masked QPixmap, the entire blit is masked by \a{src}->mask().

    If \a src, \a dst, \a sw or \a sh is 0, bitBlt() does nothing. If
    \a sw or \a sh is negative bitBlt() copies starting at \a sx (and
    respectively, \a sy) and ending at the right end (respectively,
    bottom) of \a src.

    \a src must be a QWidget or QPixmap. You cannot blit from a
    QPrinter, for example. bitBlt() does nothing if you attempt to
    blit from an unsupported device.

    bitBlt() does nothing if \a src has a greater depth than \e dst.
    If you need to for example, draw a 24-bit pixmap on an 8-bit
    widget, you must use drawPixmap().
*/

void bitBlt( QPaintDevice *dst, int dx, int dy,
	     const QPaintDevice *src, int sx, int sy, int sw, int sh,
	     Qt::RasterOp rop, bool ignoreMask )
{
    if ( !src || !dst ) {
#if defined(QT_CHECK_NULL)
	Q_ASSERT( src != 0 );
	Q_ASSERT( dst != 0 );
#endif
	return;
    }
    if ( !src->handle() || src->isExtDev() )
	return;

    QPaintDevice *pdev = QPainter::redirect( dst );
    if ( pdev )
	dst = pdev;

    int ts = src->devType();			// from device type
    int td = dst->devType();			// to device type
    Display *dpy = src->x11Display();

    if ( sw <= 0 ) {				// special width
	if ( sw < 0 )
	    sw = src->metric( QPaintDeviceMetrics::PdmWidth ) - sx;
	else
	    return;
    }
    if ( sh <= 0 ) {				// special height
	if ( sh < 0 )
	    sh = src->metric( QPaintDeviceMetrics::PdmHeight ) - sy;
	else
	    return;
    }

    if ( dst->paintingActive() && dst->isExtDev() ) {
	QPixmap *pm;				// output to picture/printer
	bool	 tmp_pm = TRUE;
	if ( ts == QInternal::Pixmap ) {
	    pm = (QPixmap*)src;
	    if ( sx != 0 || sy != 0 ||
		 sw != pm->width() || sh != pm->height() || ignoreMask ) {
		QPixmap *tmp = new QPixmap( sw, sh, pm->depth() );
		bitBlt( tmp, 0, 0, pm, sx, sy, sw, sh, Qt::CopyROP, TRUE );
		if ( pm->mask() && !ignoreMask ) {
		    QBitmap mask( sw, sh );
		    bitBlt( &mask, 0, 0, pm->mask(), sx, sy, sw, sh,
			    Qt::CopyROP, TRUE );
		    tmp->setMask( mask );
		}
		pm = tmp;
	    } else {
		tmp_pm = FALSE;
	    }
	} else if ( ts == QInternal::Widget ) {// bitBlt to temp pixmap
	    pm = new QPixmap( sw, sh );
	    Q_CHECK_PTR( pm );
	    bitBlt( pm, 0, 0, src, sx, sy, sw, sh );
	} else {
#if defined(QT_CHECK_RANGE)
	    qWarning( "bitBlt: Cannot bitBlt from device" );
#endif
	    return;
	}
	QPDevCmdParam param[3];
    QRect r(dx, dy, pm->width(), pm->height());
	param[0].rect	= &r;
	param[1].pixmap = pm;
	dst->cmd( QPaintDevice::PdcDrawPixmap, 0, param );
	if ( tmp_pm )
	    delete pm;
	return;
    }

    switch ( ts ) {
    case QInternal::Widget:
    case QInternal::Pixmap:
    case QInternal::System:			// OK, can blt from these
	break;
    default:
#if defined(QT_CHECK_RANGE)
	qWarning( "bitBlt: Cannot bitBlt from device type %x", ts );
#endif
	return;
    }
    switch ( td ) {
    case QInternal::Widget:
    case QInternal::Pixmap:
    case QInternal::System:			// OK, can blt to these
	break;
    default:
#if defined(QT_CHECK_RANGE)
	qWarning( "bitBlt: Cannot bitBlt to device type %x", td );
#endif
	return;
    }

    static const short ropCodes[] = {			// ROP translation table
	GXcopy, GXor, GXxor, GXandInverted,
	GXcopyInverted, GXorInverted, GXequiv, GXand,
	GXinvert, GXclear, GXset, GXnoop,
	GXandReverse, GXorReverse, GXnand, GXnor
    };
    if ( rop > Qt::LastROP ) {
#if defined(QT_CHECK_RANGE)
	qWarning( "bitBlt: Invalid ROP code" );
#endif
	return;
    }

    if ( dst->handle() == 0 ) {
#if defined(QT_CHECK_NULL)
	qWarning( "bitBlt: Cannot bitBlt to device" );
#endif
	return;
    }

    bool mono_src;
    bool mono_dst;
    bool include_inferiors = FALSE;
    bool graphics_exposure = FALSE;
    QPixmap *src_pm;
    QBitmap *mask;

    if ( ts == QInternal::Pixmap ) {
	src_pm = (QPixmap*)src;
    	if ( src_pm->x11Screen() != dst->x11Screen() )
    	    src_pm->x11SetScreen( dst->x11Screen() );
	mono_src = src_pm->depth() == 1;
	mask = ignoreMask ? 0 : src_pm->data->mask;
    } else {
	src_pm = 0;
	mono_src = FALSE;
	mask = 0;
	include_inferiors = ((QWidget*)src)->testWFlags(Qt::WPaintUnclipped);
	graphics_exposure = td == QInternal::Widget;
    }
    if ( td == QInternal::Pixmap ) {
      	if ( dst->x11Screen() != src->x11Screen() )
      	    ((QPixmap*)dst)->x11SetScreen( src->x11Screen() );
	mono_dst = ((QPixmap*)dst)->depth() == 1;
	((QPixmap*)dst)->detach();		// changes shared pixmap
    } else {
	mono_dst = FALSE;
	include_inferiors = include_inferiors ||
			    ((QWidget*)dst)->testWFlags(Qt::WPaintUnclipped);
    }

    if ( mono_dst && !mono_src ) {	// dest is 1-bit pixmap, source is not
#if defined(QT_CHECK_RANGE)
	qWarning( "bitBlt: Incompatible destination pixmap" );
#endif
	return;
    }

#ifndef QT_NO_XRENDER
    if (src_pm && !mono_src && src_pm->data->alphapm && !ignoreMask ) {
	// use RENDER to do the blit
	QPixmap *alpha = src_pm->data->alphapm;
	if (src->x11RenderHandle() &&
	    alpha->x11RenderHandle() &&
	    dst->x11RenderHandle()) {
	    XRenderPictureAttributes pattr;
	    ulong picmask = 0;
	    if (include_inferiors) {
		pattr.subwindow_mode = IncludeInferiors;
		picmask |= CPSubwindowMode;
	    }
	    if (graphics_exposure) {
		pattr.graphics_exposures = TRUE;
		picmask |= CPGraphicsExposure;
	    }
	    if (picmask)
		XRenderChangePicture(dpy, dst->x11RenderHandle(), picmask, &pattr);
	    XRenderComposite(dpy, PictOpOver, src->x11RenderHandle(),
			     alpha->x11RenderHandle(), dst->x11RenderHandle(),
			     sx, sy, sx, sy, dx, dy, sw, sh);
	    // restore attributes
	    pattr.subwindow_mode = ClipByChildren;
	    pattr.graphics_exposures = FALSE;
	    if (picmask)
		XRenderChangePicture(dpy, dst->x11RenderHandle(), picmask, &pattr);
	    return;
	}
    }
#endif

    GC gc;

    if ( mask && !mono_src ) {			// fast masked blt
	bool temp_gc = FALSE;
	if ( mask->data->maskgc ) {
	    gc = (GC)mask->data->maskgc;	// we have a premade mask GC
	} else {
	    if ( FALSE && src_pm->optimization() == QPixmap::NormalOptim ) { // #### cache disabled
		// Compete for the global cache
		gc = cache_mask_gc( dpy, dst->handle(),
				    mask->data->ser_no,
				    mask->handle() );
	    } else {
		// Create a new mask GC. If BestOptim, we store the mask GC
		// with the mask (not at the pixmap). This way, many pixmaps
		// which have a common mask will be optimized at no extra cost.
		gc = XCreateGC( dpy, dst->handle(), 0, 0 );
		XSetGraphicsExposures( dpy, gc, False );
		XSetClipMask( dpy, gc, mask->handle() );
		if ( src_pm->optimization() == QPixmap::BestOptim ) {
		    mask->data->maskgc = gc;
		} else {
		    temp_gc = TRUE;
		}
	    }
	}
	XSetClipOrigin( dpy, gc, dx-sx, dy-sy );
	if ( rop != Qt::CopyROP )		// use non-default ROP code
	    XSetFunction( dpy, gc, ropCodes[rop] );
	if ( include_inferiors ) {
	    XSetSubwindowMode( dpy, gc, IncludeInferiors );
	    XCopyArea( dpy, src->handle(), dst->handle(), gc, sx, sy, sw, sh,
		       dx, dy );
	    XSetSubwindowMode( dpy, gc, ClipByChildren );
	} else {
	    XCopyArea( dpy, src->handle(), dst->handle(), gc, sx, sy, sw, sh,
		       dx, dy );
	}

	if ( temp_gc )				// delete temporary GC
	    XFreeGC( dpy, gc );
	else if ( rop != Qt::CopyROP )		// restore ROP
	    XSetFunction( dpy, gc, GXcopy );
	return;
    }

    gc = qt_xget_temp_gc( dst->x11Screen(), mono_dst );		// get a reusable GC

    if ( rop != Qt::CopyROP )			// use non-default ROP code
	XSetFunction( dpy, gc, ropCodes[rop] );

    if ( mono_src && mono_dst && src == dst ) { // dst and src are the same bitmap
	XCopyArea( dpy, src->handle(), dst->handle(), gc, sx, sy, sw, sh, dx, dy );
    } else if ( mono_src ) {			// src is bitmap
	XGCValues gcvals;
	ulong	  valmask = GCBackground | GCForeground | GCFillStyle |
			    GCStipple | GCTileStipXOrigin | GCTileStipYOrigin;
	if ( td == QInternal::Widget ) {	// set GC colors
	    QWidget *w = (QWidget *)dst;
	    gcvals.background = w->backgroundColor().pixel( dst->x11Screen() );
	    gcvals.foreground = w->foregroundColor().pixel( dst->x11Screen() );
	    if ( include_inferiors ) {
		valmask |= GCSubwindowMode;
		gcvals.subwindow_mode = IncludeInferiors;
	    }
	} else if ( mono_dst ) {
	    gcvals.background = 0;
	    gcvals.foreground = 1;
	} else {
	    gcvals.background = Qt::white.pixel( dst->x11Screen() );
	    gcvals.foreground = Qt::black.pixel( dst->x11Screen() );
	}

	gcvals.fill_style  = FillOpaqueStippled;
	gcvals.stipple	   = src->handle();
	gcvals.ts_x_origin = dx - sx;
	gcvals.ts_y_origin = dy - sy;

	bool clipmask = FALSE;
	if ( mask ) {
	    if ( ((QPixmap*)src)->data->selfmask ) {
		gcvals.fill_style = FillStippled;
	    } else {
		XSetClipMask( dpy, gc, mask->handle() );
		XSetClipOrigin( dpy, gc, dx-sx, dy-sy );
		clipmask = TRUE;
	    }
	}

	XChangeGC( dpy, gc, valmask, &gcvals );
	XFillRectangle( dpy,dst->handle(), gc, dx, dy, sw, sh );

	valmask = GCFillStyle | GCTileStipXOrigin | GCTileStipYOrigin;
	gcvals.fill_style  = FillSolid;
	gcvals.ts_x_origin = 0;
	gcvals.ts_y_origin = 0;
	if ( include_inferiors ) {
	    valmask |= GCSubwindowMode;
	    gcvals.subwindow_mode = ClipByChildren;
	}
	XChangeGC( dpy, gc, valmask, &gcvals );

	if ( clipmask ) {
	    XSetClipOrigin( dpy, gc, 0, 0 );
	    XSetClipMask( dpy, gc, None );
	}

    } else {					// src is pixmap/widget

	if ( graphics_exposure )		// widget to widget
	    XSetGraphicsExposures( dpy, gc, True );
	if ( include_inferiors ) {
	    XSetSubwindowMode( dpy, gc, IncludeInferiors );
	    XCopyArea( dpy, src->handle(), dst->handle(), gc, sx, sy, sw, sh,
		       dx, dy );
	    XSetSubwindowMode( dpy, gc, ClipByChildren );
	} else {
	    XCopyArea( dpy, src->handle(), dst->handle(), gc, sx, sy, sw, sh,
		       dx, dy );
	}
	if ( graphics_exposure )		// reset graphics exposure
	    XSetGraphicsExposures( dpy, gc, False );
    }

    if ( rop != Qt::CopyROP )			// restore ROP
	XSetFunction( dpy, gc, GXcopy );
}


/*!
    \relates QPaintDevice

    \overload void bitBlt( QPaintDevice *dst, const QPoint &dp, const QPaintDevice *src, const QRect &sr, RasterOp rop )

    Overloaded bitBlt() with the destination point \a dp and source
    rectangle \a sr.
*/


/*!
  \internal
*/
// makes it possible to add a setResolution as we have in QPrinter for all
// paintdevices without breaking bin compatibility.
void QPaintDevice::setResolution( int )
{
}

/*!\internal
*/
int QPaintDevice::resolution() const
{
    return metric( QPaintDeviceMetrics::PdmDpiY );
}