summaryrefslogtreecommitdiffstats
path: root/ksnapshot/windowgrabber.cpp
blob: 70fbabdcc235582985973c091487a7036ea0f342 (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
/*
  Copyright (C) 2004 Bernd Brandstetter <bbrand@freenet.de>

  This library 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.

  This program 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 General Public License
  along with this library; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  Boston, MA 02110-1301, USA.
*/

#include "windowgrabber.h"
#include <tqbitmap.h>
#include <tqpainter.h>
#include <tqptrlist.h>
#include <algorithm>

#include <config.h>

#ifdef HAVE_X11_EXTENSIONS_SHAPE_H
#include <X11/extensions/shape.h>
#endif


static
const int minSize = 8;

static
bool operator< ( const TQRect& r1, const TQRect& r2 )
{
    return r1.width() * r1.height() < r2.width() * r2.height();
}

// Recursively iterates over the window w and its children, thereby building
// a tree of window descriptors. Windows in non-viewable state or with height
// or width smaller than minSize will be ignored.
static
void getWindowsRecursive( std::vector<TQRect>& windows, Window w,
			  int rx = 0, int ry = 0, int depth = 0 )
{
    XWindowAttributes atts;
    XGetWindowAttributes( tqt_xdisplay(), w, &atts );
    if ( atts.map_state == IsViewable &&
         atts.width >= minSize && atts.height >= minSize ) {
	int x = 0, y = 0;
	if ( depth ) {
	    x = atts.x + rx;
	    y = atts.y + ry;
	}

	TQRect r( x, y, atts.width, atts.height );
	if ( std::find( windows.begin(), windows.end(), r ) == windows.end() ) {
	    windows.push_back( r );
	}

	Window root, parent;
	Window* children;
	unsigned int nchildren;

	if( XQueryTree( tqt_xdisplay(), w, &root, &parent, &children, &nchildren ) != 0 ) {
            for( unsigned int i = 0; i < nchildren; ++i ) {
                getWindowsRecursive( windows, children[ i ], x, y, depth + 1 );
	    }
            if( children != NULL )
		XFree( children );
	}
    }
    if ( depth == 0 )
	std::sort( windows.begin(), windows.end() );
}

static
Window findRealWindow( Window w, int depth = 0 )
{
    if( depth > 5 )
	return None;
    static Atom wm_state = XInternAtom( tqt_xdisplay(), "WM_STATE", False );
    Atom type;
    int format;
    unsigned long nitems, after;
    unsigned char* prop;
    if( XGetWindowProperty( tqt_xdisplay(), w, wm_state, 0, 0, False, AnyPropertyType,
	&type, &format, &nitems, &after, &prop ) == Success ) {
	if( prop != NULL )
	    XFree( prop );
	if( type != None )
	    return w;
    }
    Window root, parent;
    Window* children;
    unsigned int nchildren;
    Window ret = None;
    if( XQueryTree( tqt_xdisplay(), w, &root, &parent, &children, &nchildren ) != 0 ) {
	for( unsigned int i = 0;
	     i < nchildren && ret == None;
	     ++i )
	    ret = findRealWindow( children[ i ], depth + 1 );
	if( children != NULL )
	    XFree( children );
    }
    return ret;
}

static
Window windowUnderCursor( bool includeDecorations = true )
{
    Window root;
    Window child;
    uint mask;
    int rootX, rootY, winX, winY;
    XGrabServer( tqt_xdisplay() );
    XQueryPointer( tqt_xdisplay(), tqt_xrootwin(), &root, &child,
		   &rootX, &rootY, &winX, &winY, &mask );
    if( child == None )
	child = tqt_xrootwin();
    if( !includeDecorations ) {
	Window real_child = findRealWindow( child );
	if( real_child != None ) // test just in case
	    child = real_child;
    }
    return child;
}

static
TQPixmap grabWindow( Window child, int x, int y, uint w, uint h, uint border )
{
    TQPixmap pm( TQPixmap::grabWindow( tqt_xrootwin(), x, y, w, h ) );

#ifdef HAVE_X11_EXTENSIONS_SHAPE_H
    int tmp1, tmp2;
    //Check whether the extension is available
    if ( XShapeQueryExtension( tqt_xdisplay(), &tmp1, &tmp2 ) ) {
	TQBitmap mask( w, h );
	//As the first step, get the mask from XShape.
	int count, order;
	XRectangle* rects = XShapeGetRectangles( tqt_xdisplay(), child,
						 ShapeBounding, &count, &order );
	//The ShapeBounding region is the outermost shape of the window;
	//ShapeBounding - ShapeClipping is defined to be the border.
	//Since the border area is part of the window, we use bounding
	// to limit our work region
	if (rects) {
	    //Create a TQRegion from the rectangles describing the bounding mask.
	    TQRegion contents;
	    for ( int pos = 0; pos < count; pos++ )
		contents += TQRegion( rects[pos].x, rects[pos].y,
				     rects[pos].width, rects[pos].height );
	    XFree( rects );

	    //Create the bounding box.
	    TQRegion bbox( 0, 0, w, h );

	    if( border > 0 ) {
		contents.translate( border, border );
		contents += TQRegion( 0, 0, border, h );
		contents += TQRegion( 0, 0, w, border );
		contents += TQRegion( 0, h - border, w, border );
		contents += TQRegion( w - border, 0, border, h );
	    }

	    //Get the masked away area.
	    TQRegion maskedAway = bbox - contents;
	    TQMemArray<TQRect> maskedAwayRects = maskedAway.rects();

	    //Construct a bitmap mask from the rectangles
	    TQPainter p(&mask);
	    p.fillRect(0, 0, w, h, TQt::color1);
	    for (uint pos = 0; pos < maskedAwayRects.count(); pos++)
		    p.fillRect(maskedAwayRects[pos], TQt::color0);
	    p.end();

	    pm.setMask(mask);
	}
    }
#endif

    return pm;
}

WindowGrabber::WindowGrabber()
: TQDialog( 0, 0, true, TQt::WStyle_Customize  | TQt::WStyle_NoBorder |
                       TQt::WStyle_StaysOnTop | TQt::WX11BypassWM ),
  current( -1 ), yPos( -1 )
{
    Window root;
    int y, x;
    uint w, h, border, depth;
    XGrabServer( tqt_xdisplay() );
    Window child = windowUnderCursor();
    XGetGeometry( tqt_xdisplay(), child, &root, &x, &y, &w, &h, &border, &depth );
    TQPixmap pm( grabWindow( child, x, y, w, h, border ) );
    getWindowsRecursive( windows, child );
    XUngrabServer( tqt_xdisplay() );

    setPaletteBackgroundPixmap( pm );
    setFixedSize( pm.size() );
    setMouseTracking( true );
    setGeometry( x, y, w, h );
}

WindowGrabber::~WindowGrabber()
{
}

TQPixmap WindowGrabber::grabCurrent( bool includeDecorations )
{
    Window root;
    int y, x;
    uint w, h, border, depth;
    XGrabServer( tqt_xdisplay() );
    Window child = windowUnderCursor( includeDecorations );
    XGetGeometry( tqt_xdisplay(), child, &root, &x, &y, &w, &h, &border, &depth );
    Window parent;
    Window* children;
    unsigned int nchildren;
    if( XQueryTree( tqt_xdisplay(), child, &root, &parent,
                    &children, &nchildren ) != 0 ) {
	if( children != NULL )
	    XFree( children );
	int newx, newy;
	Window dummy;
	if( XTranslateCoordinates( tqt_xdisplay(), parent, tqt_xrootwin(),
	    x, y, &newx, &newy, &dummy )) {
	    x = newx;
	    y = newy;
	}
    }
    TQPixmap pm( grabWindow( child, x, y, w, h, border ) );
    XUngrabServer( tqt_xdisplay() );
    return pm;
}

void WindowGrabber::mousePressEvent( TQMouseEvent *e )
{
    if ( e->button() == TQt::RightButton )
	yPos = e->globalY();
    else {
	TQPixmap pm;
	if ( current ) {
	    TQRect r( windows[ current ] );
	    int w = r.width();
	    int h = r.height();
	    pm.resize( w, h );
	    copyBlt( &pm, 0, 0, paletteBackgroundPixmap(), r.x(), r.y(), w, h );
	}
	emit windowGrabbed( pm );
        accept();
    }
}

void WindowGrabber::mouseReleaseEvent( TQMouseEvent *e )
{
    if ( e->button() == TQt::RightButton )
	yPos = -1;
}

static
const int minDistance = 10;

void WindowGrabber::mouseMoveEvent( TQMouseEvent *e )
{
    if ( yPos == -1 ) {
	int w = windowIndex( e->pos() );
	if ( w != -1 && w != current ) {
	    current = w;
	    drawBorder();
	}
    }
    else {
	int y = e->globalY();
	if ( y > yPos + minDistance ) {
	    decreaseScope( e->pos() );
	    yPos = y;
	}
	else if ( y < yPos - minDistance ) {
	    increaseScope( e->pos() );
	    yPos = y;
	}
    }
}

void WindowGrabber::wheelEvent( TQWheelEvent *e )
{
    if ( e->delta() > 0 )
	increaseScope( e->pos() );
    else if ( e->delta() < 0 )
	decreaseScope( e->pos() );
    else
	e->ignore();
}

// Increases the scope to the next-bigger window containing the mouse pointer.
// This method is activated by either rotating the mouse wheel forwards or by
// dragging the mouse forwards while keeping the right mouse button pressed.
void WindowGrabber::increaseScope( const TQPoint &pos )
{
    for ( uint i = current + 1; i < windows.size(); i++ ) {
	if ( windows[ i ].contains( pos ) ) {
	    current = i;
	    break;
	}
    }
    drawBorder();
}

// Decreases the scope to the next-smaller window containing the mosue pointer.
// This method is activated by either rotating the mouse wheel backwards or by
// dragging the mouse backwards while keeping the right mouse button pressed.
void WindowGrabber::decreaseScope( const TQPoint &pos )
{
    for ( int i = current - 1; i >= 0; i-- ) {
	if ( windows[ i ].contains( pos ) ) {
	    current = i;
	    break;
	}
    }
    drawBorder();
}

// Searches and returns the index of the first (=smallest) window
// containing the mouse pointer.
int WindowGrabber::windowIndex( const TQPoint &pos ) const
{
    for ( uint i = 0; i < windows.size(); i++ ) {
	if ( windows[ i ].contains( pos ) )
	    return i;
    }
    return -1;
}

// Draws a border around the (child) window currently containing the pointer
void WindowGrabber::drawBorder()
{
    repaint();

    if ( current >= 0 ) {
	TQPainter p;
	p.begin( this );
	p.setPen( TQPen( TQt::red, 3 ) );
	p.drawRect( windows[ current ] );
	p.end();
    }
}

#include "windowgrabber.moc"