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QGraphicsBlurEffect: Fix for high DPI scaling

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Preserve the device pixel ratio in the various helper functions
and when drawing.

Task-number: QTBUG-60026
Change-Id: Ieac9360b00044b6aedd0d3e1ad6e3b16d436f20f
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
This commit is contained in:
Friedemann Kleint 2017-04-18 14:47:46 +02:00
parent fc2f0fb390
commit 9595622e36
2 changed files with 10 additions and 1 deletions
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6
src/widgets/effects/qpixmapfilter.cpp
View File

@ -719,6 +719,7 @@ void expblur(QImage &img, qreal radius, bool improvedQuality = false, int transp
}
QImage temp(img.height(), img.width(), img.format());
temp.setDevicePixelRatio(img.devicePixelRatioF());
if (transposed >= 0) {
if (img.depth() == 8) {
qt_memrotate270(reinterpret_cast<const quint8*>(img.bits()),
@ -780,6 +781,7 @@ Q_WIDGETS_EXPORT QImage qt_halfScaled(const QImage &source)
if (source.format() == QImage::Format_Indexed8 || source.format() == QImage::Format_Grayscale8) {
// assumes grayscale
QImage dest(source.width() / 2, source.height() / 2, srcImage.format());
dest.setDevicePixelRatio(source.devicePixelRatioF());
const uchar *src = reinterpret_cast<const uchar*>(const_cast<const QImage &>(srcImage).bits());
int sx = srcImage.bytesPerLine();
@ -801,6 +803,7 @@ Q_WIDGETS_EXPORT QImage qt_halfScaled(const QImage &source)
return dest;
} else if (source.format() == QImage::Format_ARGB8565_Premultiplied) {
QImage dest(source.width() / 2, source.height() / 2, srcImage.format());
dest.setDevicePixelRatio(source.devicePixelRatioF());
const uchar *src = reinterpret_cast<const uchar*>(const_cast<const QImage &>(srcImage).bits());
int sx = srcImage.bytesPerLine();
@ -837,6 +840,7 @@ Q_WIDGETS_EXPORT QImage qt_halfScaled(const QImage &source)
}
QImage dest(source.width() / 2, source.height() / 2, srcImage.format());
dest.setDevicePixelRatio(source.devicePixelRatioF());
const quint32 *src = reinterpret_cast<const quint32*>(const_cast<const QImage &>(srcImage).bits());
int sx = srcImage.bytesPerLine() >> 2;
@ -881,7 +885,7 @@ Q_WIDGETS_EXPORT void qt_blurImage(QPainter *p, QImage &blurImage, qreal radius,
if (p) {
p->scale(scale, scale);
p->setRenderHint(QPainter::SmoothPixmapTransform);
p->drawImage(QRect(0, 0, blurImage.width(), blurImage.height()), blurImage);
p->drawImage(QRect(QPoint(0, 0), blurImage.size() / blurImage.devicePixelRatioF()), blurImage);
}
}

5
tests/auto/widgets/effects/qpixmapfilter/tst_qpixmapfilter.cpp
View File

@ -390,6 +390,7 @@ QT_END_NAMESPACE
void tst_QPixmapFilter::blurIndexed8()
{
QImage img(16, 32, QImage::Format_Indexed8);
img.setDevicePixelRatio(2);
img.setColorCount(256);
for (int i = 0; i < 256; ++i)
img.setColor(i, qRgb(i, i, i));
@ -399,9 +400,13 @@ void tst_QPixmapFilter::blurIndexed8()
QImage original = img;
qt_blurImage(img, 10, true, false);
QCOMPARE(original.size(), img.size());
QVERIFY2(qFuzzyCompare(img.devicePixelRatioF(), qreal(2)),
QByteArray::number(img.devicePixelRatioF()).constData());
original = img;
qt_blurImage(img, 10, true, true);
QVERIFY2(qFuzzyCompare(img.devicePixelRatioF(), qreal(2)),
QByteArray::number(img.devicePixelRatioF()).constData());
QCOMPARE(original.size(), QSize(img.height(), img.width()));
}