summaryrefslogtreecommitdiffstats
path: root/src/gui/painting/qwindowsurface.cpp
blob: 0fb9bf78a96e85a74a320a71e982f5662840703a (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
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <private/qwindowsurface_p.h>
#include <qwidget.h>
#include <private/qwidget_p.h>
#include <private/qbackingstore_p.h>
#include <private/qapplication_p.h>

QT_BEGIN_NAMESPACE

class QWindowSurfacePrivate
{
public:
    QWindowSurfacePrivate(QWidget *w)
        : window(w)
    {
    }

    QWidget *window;
#if !defined(Q_WS_QPA)
    QRect geometry;
#else
    QSize size;
#endif //Q_WS_QPA
    QRegion staticContents;
    QList<QImage*> bufferImages;
};

/*!
    \class QWindowSurface
    \since 4.3
    \internal
    \preliminary
    \ingroup qws qpa

    \brief The QWindowSurface class provides the drawing area for top-level
    windows.
*/


/*!
    \fn void QWindowSurface::beginPaint(const QRegion &region)

    This function is called before painting onto the surface begins,
    with the \a region in which the painting will occur.

    \sa endPaint(), paintDevice()
*/

/*!
    \fn void QWindowSurface::endPaint(const QRegion &region)

    This function is called after painting onto the surface has ended,
    with the \a region in which the painting was performed.

    \sa beginPaint(), paintDevice()
*/

/*!
    \fn void QWindowSurface::flush(QWidget *widget, const QRegion &region,
                                  const QPoint &offset)

    Flushes the given \a region from the specified \a widget onto the
    screen.

    Note that the \a offset parameter is currently unused.
*/

/*!
    \fn QPaintDevice* QWindowSurface::paintDevice()

    Implement this function to return the appropriate paint device.
*/

/*!
    Constructs an empty surface for the given top-level \a window.
*/
QWindowSurface::QWindowSurface(QWidget *window, bool setDefaultSurface)
    : d_ptr(new QWindowSurfacePrivate(window))
{
    if (!QApplicationPrivate::runtime_graphics_system) {
        if(setDefaultSurface && window)
            window->setWindowSurface(this);
    }
}

/*!
    Destroys this surface.
*/
QWindowSurface::~QWindowSurface()
{
    if (d_ptr->window)
        d_ptr->window->d_func()->extra->topextra->windowSurface = 0;
    delete d_ptr;
}

/*!
    Returns a pointer to the top-level window associated with this
    surface.
*/
QWidget* QWindowSurface::window() const
{
    return d_ptr->window;
}

void QWindowSurface::beginPaint(const QRegion &)
{
}

void QWindowSurface::endPaint(const QRegion &)
{
//     QApplication::syncX();
    qDeleteAll(d_ptr->bufferImages);
    d_ptr->bufferImages.clear();
}

#if !defined(Q_WS_QPA)
/*!
    Sets the currently allocated area to be the given \a rect.

    This function is called whenever area covered by the top-level
    window changes.

    \sa geometry()
*/
void QWindowSurface::setGeometry(const QRect &rect)
{
    d_ptr->geometry = rect;
}

/*!
    Returns the currently allocated area on the screen.
*/
QRect QWindowSurface::geometry() const
{
    return d_ptr->geometry;
}
#else

/*!
      Sets the size of the windowsurface to be \a size.

      \sa size()
*/
void QWindowSurface::resize(const QSize &size)
{
    d_ptr->size = size;
}

/*!
    Returns the current size of the windowsurface.
*/
QSize QWindowSurface::size() const
{
    return d_ptr->size;
}
#endif //Q_WS_QPA

/*!
    Scrolls the given \a area \a dx pixels to the right and \a dy
    downward; both \a dx and \a dy may be negative.

    Returns true if the area was scrolled successfully; false otherwise.
*/
bool QWindowSurface::scroll(const QRegion &area, int dx, int dy)
{
    Q_UNUSED(area);
    Q_UNUSED(dx);
    Q_UNUSED(dy);

    return false;
}

/*!
    Returns a QImage pointer which represents the actual buffer the \a widget
    is drawn into or 0 if this is unavailable.

    You must call beginPaint() before you call this function and the returned
    pointer is only valid until endPaint() is called.
*/
QImage* QWindowSurface::buffer(const QWidget *widget)
{
    if (widget->window() != window())
        return 0;

    QPaintDevice *pdev = paintDevice();
    if (!pdev || pdev->devType() != QInternal::Image)
        return 0;

    const QPoint off = offset(widget);
    QImage *img = static_cast<QImage*>(pdev);

    QRect rect(off, widget->size());
    rect &= QRect(QPoint(), img->size());

    if (rect.isEmpty())
        return 0;

    img = new QImage(img->scanLine(rect.y()) + rect.x() * img->depth() / 8,
                     rect.width(), rect.height(),
                     img->bytesPerLine(), img->format());
    d_ptr->bufferImages.append(img);

    return img;
}

/*!
  Returns a QPixmap generated from the part of the backing store
  corresponding to \a widget. Returns a null QPixmap if an error
  occurs. The contents of the pixmap are only defined for the regions
  of \a widget that have received paint events since the last resize
  of the backing store.

  If \a rectangle is a null rectangle (the default), the entire widget
  is grabbed. Otherwise, the grabbed area is limited to \a rectangle.

  The default implementation uses QWindowSurface::buffer().

  \sa QPixmap::grabWidget()
*/
QPixmap QWindowSurface::grabWidget(const QWidget *widget, const QRect &rectangle) const
{
    QPixmap result;

    if (widget->window() != window())
        return result;

    const QImage *img = const_cast<QWindowSurface *>(this)->buffer(widget->window());

    if (!img || img->isNull())
        return result;

    QRect rect = rectangle.isEmpty() ? widget->rect() : (widget->rect() & rectangle);

    rect.translate(offset(widget) - offset(widget->window()));
    rect &= QRect(QPoint(), img->size());

    if (rect.isEmpty())
        return result;

    QImage subimg(img->scanLine(rect.y()) + rect.x() * img->depth() / 8,
                  rect.width(), rect.height(),
                  img->bytesPerLine(), img->format());
    subimg.detach(); //### expensive -- maybe we should have a real SubImage that shares reference count

    result = QPixmap::fromImage(subimg);
    return result;
}

/*!
  Returns the offset of \a widget in the coordinates of this
  window surface.
 */
QPoint QWindowSurface::offset(const QWidget *widget) const
{
    QWidget *window = d_ptr->window;
    QPoint offset = widget->mapTo(window, QPoint());
#ifdef Q_WS_QWS
    offset += window->geometry().topLeft() - window->frameGeometry().topLeft();
#endif
    return offset;
}

/*!
  \fn QRect QWindowSurface::rect(const QWidget *widget) const

  Returns the rectangle for \a widget in the coordinates of this
  window surface.
*/

void QWindowSurface::setStaticContents(const QRegion &region)
{
    d_ptr->staticContents = region;
}

QRegion QWindowSurface::staticContents() const
{
    return d_ptr->staticContents;
}

bool QWindowSurface::hasStaticContents() const
{
    return hasFeature(QWindowSurface::StaticContents) && !d_ptr->staticContents.isEmpty();
}

QWindowSurface::WindowSurfaceFeatures QWindowSurface::features() const
{
    return PartialUpdates | PreservedContents;
}

#ifdef Q_WS_QPA
#define Q_EXPORT_SCROLLRECT Q_GUI_EXPORT
#else
#define Q_EXPORT_SCROLLRECT
#endif

void Q_EXPORT_SCROLLRECT qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset)
{
    // make sure we don't detach
    uchar *mem = const_cast<uchar*>(const_cast<const QImage &>(img).bits());

    int lineskip = img.bytesPerLine();
    int depth = img.depth() >> 3;

    const QRect imageRect(0, 0, img.width(), img.height());
    const QRect r = rect & imageRect & imageRect.translated(-offset);
    const QPoint p = rect.topLeft() + offset;

    if (r.isEmpty())
        return;

    const uchar *src;
    uchar *dest;

    if (r.top() < p.y()) {
        src = mem + r.bottom() * lineskip + r.left() * depth;
        dest = mem + (p.y() + r.height() - 1) * lineskip + p.x() * depth;
        lineskip = -lineskip;
    } else {
        src = mem + r.top() * lineskip + r.left() * depth;
        dest = mem + p.y() * lineskip + p.x() * depth;
    }

    const int w = r.width();
    int h = r.height();
    const int bytes = w * depth;

    // overlapping segments?
    if (offset.y() == 0 && qAbs(offset.x()) < w) {
        do {
            ::memmove(dest, src, bytes);
            dest += lineskip;
            src += lineskip;
        } while (--h);
    } else {
        do {
            ::memcpy(dest, src, bytes);
            dest += lineskip;
            src += lineskip;
        } while (--h);
    }
}

QT_END_NAMESPACE