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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <qwindow.h>
#include <qbackingstore.h>
#include <qpa/qplatformbackingstore.h>
#include <qpainter.h>
#include <QTest>
#include <QEvent>
// For QSignalSpy slot connections.
Q_DECLARE_METATYPE(Qt::ScreenOrientation)
class tst_QBackingStore : public QObject
{
Q_OBJECT
private slots:
void initTestCase_data();
void init();
void resize();
void paint();
void scrollRectInImage_data();
void scrollRectInImage();
void scroll();
void flush();
};
void tst_QBackingStore::initTestCase_data()
{
QTest::addColumn<QSurfaceFormat::SwapBehavior>("swapBehavior");
QTest::newRow("single-buffer") << QSurfaceFormat::SingleBuffer;
QTest::newRow("double-buffer") << QSurfaceFormat::DoubleBuffer;
}
void tst_QBackingStore::init()
{
QFETCH_GLOBAL(QSurfaceFormat::SwapBehavior, swapBehavior);
QSurfaceFormat defaultFormat = QSurfaceFormat::defaultFormat();
defaultFormat.setSwapBehavior(swapBehavior);
QSurfaceFormat::setDefaultFormat(defaultFormat);
}
void tst_QBackingStore::resize()
{
QWindow window;
window.create();
QBackingStore backingStore(&window);
QRect rect(0, 0, 100, 100);
backingStore.resize(rect.size());
QCOMPARE(backingStore.size(), rect.size());
// The paint device should reflect the requested
// size, taking the window's DPR into account.
backingStore.beginPaint(rect);
auto paintDevice = backingStore.paintDevice();
QCOMPARE(paintDevice->devicePixelRatio(), window.devicePixelRatio());
QCOMPARE(QSize(paintDevice->width(), paintDevice->height()),
rect.size() * window.devicePixelRatio());
backingStore.endPaint();
// So should the platform backingstore when accessed as an QImage
QImage image = backingStore.handle()->toImage();
if (!image.isNull()) // toImage might not be implemented
QCOMPARE(image.size(), rect.size() * window.devicePixelRatio());
}
void tst_QBackingStore::paint()
{
QWindow window;
window.create();
// The resize() test verifies that the backingstore image
// has a size that takes the window's DPR into account.
auto dpr = window.devicePixelRatio();
QBackingStore backingStore(&window);
QRect rect(0, 0, 100, 100);
backingStore.resize(rect.size());
// Two rounds, with flush in between
for (int i = 0; i < 2; ++i) {
backingStore.beginPaint(rect);
QPainter p(backingStore.paintDevice());
QColor bgColor = i ? Qt::red : Qt::blue;
QColor fgColor = i ? Qt::green : Qt::yellow;
p.fillRect(rect, bgColor);
p.fillRect(QRect(50, 50, 10, 10), fgColor);
p.end();
backingStore.endPaint();
QImage image = backingStore.handle()->toImage();
if (image.isNull())
QSKIP("Platform backingstore does not implement toImage");
QCOMPARE(image.pixelColor(50 * dpr, 50 * dpr), fgColor);
QCOMPARE(image.pixelColor(49 * dpr, 50 * dpr), bgColor);
QCOMPARE(image.pixelColor(50 * dpr, 49 * dpr), bgColor);
QCOMPARE(image.pixelColor(59 * dpr, 59 * dpr), fgColor);
QCOMPARE(image.pixelColor(60 * dpr, 59 * dpr), bgColor);
QCOMPARE(image.pixelColor(59 * dpr, 60 * dpr), bgColor);
backingStore.flush(rect);
}
}
void tst_QBackingStore::scrollRectInImage_data()
{
QTest::addColumn<QRect>("rect");
QTest::addColumn<QPoint>("offset");
QTest::newRow("empty rect") << QRect() << QPoint();
QTest::newRow("rect outside image") << QRect(-100, -100, 1000, 1000) << QPoint(10, 10);
QTest::newRow("scroll outside positive") << QRect(10, 10, 10, 10) << QPoint(1000, 1000);
QTest::newRow("scroll outside negative") << QRect(10, 10, 10, 10) << QPoint(-1000, -1000);
QTest::newRow("sub-rect positive scroll") << QRect(100, 100, 50, 50) << QPoint(10, 10);
QTest::newRow("sub-rect negative scroll") << QRect(100, 100, 50, 50) << QPoint(-10, -10);
QTest::newRow("positive vertical only") << QRect(100, 100, 50, 50) << QPoint(0, 10);
QTest::newRow("negative vertical only") << QRect(100, 100, 50, 50) << QPoint(0, -10);
QTest::newRow("positive horizontal only") << QRect(100, 100, 50, 50) << QPoint(10, 0);
QTest::newRow("negative horizontal only") << QRect(100, 100, 50, 50) << QPoint(-10, 0);
QTest::newRow("whole rect positive") << QRect(0, 0, 250, 250) << QPoint(10, 10);
QTest::newRow("whole rect negative") << QRect(0, 0, 250, 250) << QPoint(-10, -10);
}
QT_BEGIN_NAMESPACE
Q_GUI_EXPORT void qt_scrollRectInImage(QImage &, const QRect &, const QPoint &);
QT_END_NAMESPACE
void tst_QBackingStore::scrollRectInImage()
{
QImage test(250, 250, QImage::Format_ARGB32_Premultiplied);
QFETCH(QRect, rect);
QFETCH(QPoint, offset);
qt_scrollRectInImage(test, rect, offset);
}
void tst_QBackingStore::scroll()
{
QWindow window;
window.create();
// The resize() test verifies that the backingstore image
// has a size that takes the window's DPR into account.
auto dpr = window.devicePixelRatio();
QBackingStore backingStore(&window);
QRect rect(0, 0, 100, 100);
// Scrolling a backingstore without a size shouldn't crash
backingStore.scroll(rect, 10, 10);
backingStore.scroll(rect, -10, -10);
backingStore.resize(rect.size());
// Scrolling a backingstore without painting to it shouldn't crash
backingStore.scroll(rect, 10, 10);
backingStore.scroll(rect, -10, -10);
// Two rounds, with flush in between
for (int i = 0; i < 2; ++i) {
backingStore.beginPaint(rect);
QPainter p(backingStore.paintDevice());
QColor bgColor = i ? Qt::red : Qt::blue;
QColor fgColor = i ? Qt::green : Qt::yellow;
p.fillRect(rect, bgColor);
p.fillRect(QRect(50, 50, 10, 10), fgColor);
p.end();
backingStore.endPaint();
QImage image = backingStore.handle()->toImage();
if (image.isNull())
QSKIP("Platform backingstore does not implement toImage");
QCOMPARE(image.pixelColor(50 * dpr, 50 * dpr), fgColor);
QCOMPARE(image.pixelColor(49 * dpr, 50 * dpr), bgColor);
QCOMPARE(image.pixelColor(50 * dpr, 49 * dpr), bgColor);
QCOMPARE(image.pixelColor(59 * dpr, 59 * dpr), fgColor);
QCOMPARE(image.pixelColor(60 * dpr, 59 * dpr), bgColor);
QCOMPARE(image.pixelColor(59 * dpr, 60 * dpr), bgColor);
image = {};
bool supportsScroll = backingStore.scroll(QRect(52, 52, 6, 6), -12, -12);
if (!supportsScroll)
QSKIP("Platform backingstore does not support scrolling");
image = backingStore.handle()->toImage();
QCOMPARE(image.pixelColor(40 * dpr, 40 * dpr), fgColor);
QCOMPARE(image.pixelColor(39 * dpr, 40 * dpr), bgColor);
QCOMPARE(image.pixelColor(40 * dpr, 39 * dpr), bgColor);
QCOMPARE(image.pixelColor(45 * dpr, 45 * dpr), fgColor);
QCOMPARE(image.pixelColor(46 * dpr, 45 * dpr), bgColor);
QCOMPARE(image.pixelColor(45 * dpr, 46 * dpr), bgColor);
image = {};
backingStore.flush(rect);
// Scroll again after flush, but before new round of painting
backingStore.scroll(QRect(52, 52, 6, 6), 12, 12);
image = backingStore.handle()->toImage();
QCOMPARE(image.pixelColor(64 * dpr, 64 * dpr), fgColor);
QCOMPARE(image.pixelColor(63 * dpr, 64 * dpr), bgColor);
QCOMPARE(image.pixelColor(64 * dpr, 63 * dpr), bgColor);
QCOMPARE(image.pixelColor(69 * dpr, 69 * dpr), fgColor);
QCOMPARE(image.pixelColor(70 * dpr, 69 * dpr), bgColor);
QCOMPARE(image.pixelColor(69 * dpr, 70 * dpr), bgColor);
image = {};
}
}
class Window : public QWindow
{
public:
Window()
: backingStore(this)
{
}
void resizeEvent(QResizeEvent *) override
{
backingStore.resize(size());
}
void paintEvent(QPaintEvent *event) override
{
QRect rect(QPoint(), size());
backingStore.beginPaint(rect);
QPainter p(backingStore.paintDevice());
p.fillRect(rect, Qt::white);
p.end();
backingStore.endPaint();
backingStore.flush(event->region().boundingRect());
}
private:
QBackingStore backingStore;
};
void tst_QBackingStore::flush()
{
Window window;
window.setGeometry(20, 20, 200, 200);
window.showMaximized();
QTRY_VERIFY(window.isExposed());
}
#include <tst_qbackingstore.moc>
QTEST_MAIN(tst_QBackingStore);
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