qbackingstore.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2015 The Qt Company Ltd.-
4** Contact: http://www.qt.io/licensing/-
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6** This file is part of the QtGui module of the Qt Toolkit.-
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30** $QT_END_LICENSE$-
31**-
32****************************************************************************/-
33-
34#include <qbackingstore.h>-
35#include <qwindow.h>-
36#include <qpixmap.h>-
37#include <qpa/qplatformbackingstore.h>-
38#include <qpa/qplatformintegration.h>-
39#include <qscreen.h>-
40#include <qdebug.h>-
41#include <qscopedpointer.h>-
42-
43#include <private/qguiapplication_p.h>-
44#include <private/qwindow_p.h>-
45-
46#include <private/qhighdpiscaling_p.h>-
47-
48QT_BEGIN_NAMESPACE-
49-
50class QBackingStorePrivate-
51{-
52public:-
53 QBackingStorePrivate(QWindow *w)-
54 : window(w)-
55 {-
56 }
never executed: end of block
0
57-
58 QWindow *window;-
59 QPlatformBackingStore *platformBackingStore;-
60 QScopedPointer<QImage> highDpiBackingstore;-
61 QRegion staticContents;-
62 QSize size;-
63};-
64-
65/*!-
66 \class QBackingStore-
67 \since 5.0-
68 \inmodule QtGui-
69-
70 \brief The QBackingStore class provides a drawing area for QWindow.-
71-
72 QBackingStore enables the use of QPainter to paint on a QWindow with type-
73 RasterSurface. The other way of rendering to a QWindow is through the use-
74 of OpenGL with QOpenGLContext.-
75-
76 A QBackingStore contains a buffered representation of the window contents,-
77 and thus supports partial updates by using QPainter to only update a sub-
78 region of the window contents.-
79-
80 QBackingStore might be used by an application that wants to use QPainter-
81 without OpenGL acceleration and without the extra overhead of using the-
82 QWidget or QGraphicsView UI stacks. For an example of how to use-
83 QBackingStore see the \l{Raster Window Example}.-
84*/-
85-
86/*!-
87 Flushes the given \a region from the specified window \a win onto the-
88 screen.-
89-
90 Note that the \a offset parameter is currently unused.-
91*/-
92void QBackingStore::flush(const QRegion &region, QWindow *win, const QPoint &offset)-
93{-
94 if (!win)
!winDescription
TRUEnever evaluated
FALSEnever evaluated
0
95 win = window();
never executed: win = window();
0
96 if (!win->handle()) {
!win->handle()Description
TRUEnever evaluated
FALSEnever evaluated
0
97 qWarning() << "QBackingStore::flush() called for "-
98 << win << " which does not have a handle.";-
99 return;
never executed: return;
0
100 }-
101-
102#ifdef QBACKINGSTORE_DEBUG-
103 if (win && win->isTopLevel() && !qt_window_private(win)->receivedExpose) {-
104 qWarning().nospace() << "QBackingStore::flush() called with non-exposed window "-
105 << win << ", behavior is undefined";-
106 }-
107#endif-
108-
109 d_ptr->platformBackingStore->flush(win, QHighDpi::toNativeLocalRegion(region, win),-
110 QHighDpi::toNativeLocalPosition(offset, win));-
111}
never executed: end of block
0
112-
113/*!-
114 \fn QPaintDevice* QBackingStore::paintDevice()-
115-
116 Implement this function to return the appropriate paint device.-
117*/-
118QPaintDevice *QBackingStore::paintDevice()-
119{-
120 QPaintDevice *device = d_ptr->platformBackingStore->paintDevice();-
121-
122 if (QHighDpiScaling::isActive() && device->devType() == QInternal::Image)
QHighDpiScaling::isActive()Description
TRUEnever evaluated
FALSEnever evaluated
device->devTyp...nternal::ImageDescription
TRUEnever evaluated
FALSEnever evaluated
0
123 return d_ptr->highDpiBackingstore.data();
never executed: return d_ptr->highDpiBackingstore.data();
0
124-
125 return device;
never executed: return device;
0
126}-
127-
128/*!-
129 Constructs an empty surface for the given top-level \a window.-
130*/-
131QBackingStore::QBackingStore(QWindow *window)-
132 : d_ptr(new QBackingStorePrivate(window))-
133{-
134 d_ptr->platformBackingStore = QGuiApplicationPrivate::platformIntegration()->createPlatformBackingStore(window);-
135}
never executed: end of block
0
136-
137/*!-
138 Destroys this surface.-
139*/-
140QBackingStore::~QBackingStore()-
141{-
142 delete d_ptr->platformBackingStore;-
143}
never executed: end of block
0
144-
145/*!-
146 Returns a pointer to the top-level window associated with this-
147 surface.-
148*/-
149QWindow* QBackingStore::window() const-
150{-
151 return d_ptr->window;
never executed: return d_ptr->window;
0
152}-
153-
154/*!-
155 This function is called before painting onto the surface begins,-
156 with the \a region in which the painting will occur.-
157-
158 \sa endPaint(), paintDevice()-
159*/-
160-
161void QBackingStore::beginPaint(const QRegion &region)-
162{-
163 if (d_ptr->highDpiBackingstore &&
d_ptr->highDpiBackingstoreDescription
TRUEnever evaluated
FALSEnever evaluated
0
164 d_ptr->highDpiBackingstore->devicePixelRatio() != d_ptr->window->devicePixelRatio())
d_ptr->highDpi...cePixelRatio()Description
TRUEnever evaluated
FALSEnever evaluated
0
165 resize(size());
never executed: resize(size());
0
166-
167 d_ptr->platformBackingStore->beginPaint(QHighDpi::toNativeLocalRegion(region, d_ptr->window));-
168-
169 // When QtGui is applying a high-dpi scale factor the backing store-
170 // creates a "large" backing store image. This image needs to be-
171 // painted on as a high-dpi image, which is done by setting-
172 // devicePixelRatio. Do this on a separate image instance that shares-
173 // the image data to avoid having the new devicePixelRatio be propagated-
174 // back to the platform plugin.-
175 QPaintDevice *device = d_ptr->platformBackingStore->paintDevice();-
176 if (QHighDpiScaling::isActive() && device->devType() == QInternal::Image) {
QHighDpiScaling::isActive()Description
TRUEnever evaluated
FALSEnever evaluated
device->devTyp...nternal::ImageDescription
TRUEnever evaluated
FALSEnever evaluated
0
177 QImage *source = static_cast<QImage *>(device);-
178 const bool needsNewImage = d_ptr->highDpiBackingstore.isNull()
d_ptr->highDpi...store.isNull()Description
TRUEnever evaluated
FALSEnever evaluated
0
179 || source->data_ptr() != d_ptr->highDpiBackingstore->data_ptr()
source->data_p...re->data_ptr()Description
TRUEnever evaluated
FALSEnever evaluated
0
180 || source->size() != d_ptr->highDpiBackingstore->size()
source->size()...gstore->size()Description
TRUEnever evaluated
FALSEnever evaluated
0
181 || source->devicePixelRatio() != d_ptr->highDpiBackingstore->devicePixelRatio();
source->device...cePixelRatio()Description
TRUEnever evaluated
FALSEnever evaluated
0
182 if (needsNewImage) {
needsNewImageDescription
TRUEnever evaluated
FALSEnever evaluated
0
183 qCDebug(lcScaling) << "QBackingStore::beginPaint new backingstore for" << d_ptr->window;
never executed: QMessageLogger(__FILE__, 183, __PRETTY_FUNCTION__, lcScaling().categoryName()).debug() << "QBackingStore::beginPaint new backingstore for" << d_ptr->window;
qt_category_enabledDescription
TRUEnever evaluated
FALSEnever evaluated
0
184 qCDebug(lcScaling) << " source size" << source->size() << "dpr" << source->devicePixelRatio();
never executed: QMessageLogger(__FILE__, 184, __PRETTY_FUNCTION__, lcScaling().categoryName()).debug() << " source size" << source->size() << "dpr" << source->devicePixelRatio();
qt_category_enabledDescription
TRUEnever evaluated
FALSEnever evaluated
0
185 d_ptr->highDpiBackingstore.reset(-
186 new QImage(source->bits(), source->width(), source->height(), source->bytesPerLine(), source->format()));-
187-
188 qreal targetDevicePixelRatio = d_ptr->window->devicePixelRatio();-
189 d_ptr->highDpiBackingstore->setDevicePixelRatio(targetDevicePixelRatio);-
190 qCDebug(lcScaling) <<" destination size" << d_ptr->highDpiBackingstore->size()
never executed: QMessageLogger(__FILE__, 190, __PRETTY_FUNCTION__, lcScaling().categoryName()).debug() <<" destination size" << d_ptr->highDpiBackingstore->size() << "dpr" << targetDevicePixelRatio;
qt_category_enabledDescription
TRUEnever evaluated
FALSEnever evaluated
0
191 << "dpr" << targetDevicePixelRatio;
never executed: QMessageLogger(__FILE__, 190, __PRETTY_FUNCTION__, lcScaling().categoryName()).debug() <<" destination size" << d_ptr->highDpiBackingstore->size() << "dpr" << targetDevicePixelRatio;
0
192 }
never executed: end of block
0
193 }
never executed: end of block
0
194}
never executed: end of block
0
195-
196/*!-
197 This function is called after painting onto the surface has ended.-
198-
199 \sa beginPaint(), paintDevice()-
200*/-
201void QBackingStore::endPaint()-
202{-
203 d_ptr->platformBackingStore->endPaint();-
204}
never executed: end of block
0
205-
206/*!-
207 Sets the size of the windowsurface to be \a size.-
208-
209 \sa size()-
210*/-
211void QBackingStore::resize(const QSize &size)-
212{-
213 d_ptr->size = size;-
214 d_ptr->platformBackingStore->resize(QHighDpi::toNativePixels(size, d_ptr->window), d_ptr->staticContents);-
215}
never executed: end of block
0
216-
217/*!-
218 Returns the current size of the windowsurface.-
219*/-
220QSize QBackingStore::size() const-
221{-
222 return d_ptr->size;
never executed: return d_ptr->size;
0
223}-
224-
225/*!-
226 Scrolls the given \a area \a dx pixels to the right and \a dy-
227 downward; both \a dx and \a dy may be negative.-
228-
229 Returns \c true if the area was scrolled successfully; false otherwise.-
230*/-
231bool QBackingStore::scroll(const QRegion &area, int dx, int dy)-
232{-
233 // Disable scrolling for non-integer scroll deltas. For this case-
234 // the the existing rendered pixels can't be re-used, and we return-
235 // false to signal that a repaint is needed.-
236 const qreal nativeDx = QHighDpi::toNativePixels(qreal(dx), d_ptr->window);-
237 const qreal nativeDy = QHighDpi::toNativePixels(qreal(dy), d_ptr->window);-
238 if (qFloor(nativeDx) != nativeDx || qFloor(nativeDy) != nativeDy)
qFloor(nativeDx) != nativeDxDescription
TRUEnever evaluated
FALSEnever evaluated
qFloor(nativeDy) != nativeDyDescription
TRUEnever evaluated
FALSEnever evaluated
0
239 return false;
never executed: return false;
0
240-
241 return d_ptr->platformBackingStore->scroll(QHighDpi::toNativeLocalRegion(area, d_ptr->window),
never executed: return d_ptr->platformBackingStore->scroll(QHighDpi::toNativeLocalRegion(area, d_ptr->window), nativeDx, nativeDy);
0
242 nativeDx, nativeDy);
never executed: return d_ptr->platformBackingStore->scroll(QHighDpi::toNativeLocalRegion(area, d_ptr->window), nativeDx, nativeDy);
0
243}-
244-
245/*!-
246 Set \a region as the static contents of this window.-
247*/-
248void QBackingStore::setStaticContents(const QRegion &region)-
249{-
250 d_ptr->staticContents = region;-
251}
never executed: end of block
0
252-
253/*!-
254 Returns a pointer to the QRegion that has the static contents-
255 of this window.-
256*/-
257QRegion QBackingStore::staticContents() const-
258{-
259 return d_ptr->staticContents;
never executed: return d_ptr->staticContents;
0
260}-
261-
262/*!-
263 Returns a boolean indicating if this window-
264 has static contents or not.-
265*/-
266bool QBackingStore::hasStaticContents() const-
267{-
268 return !d_ptr->staticContents.isEmpty();
never executed: return !d_ptr->staticContents.isEmpty();
0
269}-
270-
271void Q_GUI_EXPORT qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset)-
272{-
273 // make sure we don't detach-
274 uchar *mem = const_cast<uchar*>(const_cast<const QImage &>(img).bits());-
275-
276 int lineskip = img.bytesPerLine();-
277 int depth = img.depth() >> 3;-
278-
279 const QRect imageRect(0, 0, img.width(), img.height());-
280 const QRect r = rect & imageRect & imageRect.translated(-offset);-
281 const QPoint p = rect.topLeft() + offset;-
282-
283 if (r.isEmpty())
r.isEmpty()Description
TRUEnever evaluated
FALSEnever evaluated
0
284 return;
never executed: return;
0
285-
286 const uchar *src;-
287 uchar *dest;-
288-
289 if (r.top() < p.y()) {
r.top() < p.y()Description
TRUEnever evaluated
FALSEnever evaluated
0
290 src = mem + r.bottom() * lineskip + r.left() * depth;-
291 dest = mem + (p.y() + r.height() - 1) * lineskip + p.x() * depth;-
292 lineskip = -lineskip;-
293 } else {
never executed: end of block
0
294 src = mem + r.top() * lineskip + r.left() * depth;-
295 dest = mem + p.y() * lineskip + p.x() * depth;-
296 }
never executed: end of block
0
297-
298 const int w = r.width();-
299 int h = r.height();-
300 const int bytes = w * depth;-
301-
302 // overlapping segments?-
303 if (offset.y() == 0 && qAbs(offset.x()) < w) {
offset.y() == 0Description
TRUEnever evaluated
FALSEnever evaluated
qAbs(offset.x()) < wDescription
TRUEnever evaluated
FALSEnever evaluated
0
304 do {-
305 ::memmove(dest, src, bytes);-
306 dest += lineskip;-
307 src += lineskip;-
308 } while (--h);
never executed: end of block
--hDescription
TRUEnever evaluated
FALSEnever evaluated
0
309 } else {
never executed: end of block
0
310 do {-
311 ::memcpy(dest, src, bytes);-
312 dest += lineskip;-
313 src += lineskip;-
314 } while (--h);
never executed: end of block
--hDescription
TRUEnever evaluated
FALSEnever evaluated
0
315 }
never executed: end of block
0
316}-
317-
318/*!-
319 Returns a pointer to the QPlatformBackingStore implementation-
320*/-
321QPlatformBackingStore *QBackingStore::handle() const-
322{-
323 return d_ptr->platformBackingStore;
never executed: return d_ptr->platformBackingStore;
0
324}-
325-
326QT_END_NAMESPACE-
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