1berry/qtbase
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Minor performance improvement to QLabel with Image

Browse Source 
QPixmap::fromImage in QLabel paintEvent should use the rvalue
reference overload for efficiency

[ChangeLog][QtWidgets][QLabel] Minor performance improvement
when painting a label with an image

Change-Id: I8ab9bf427c1efc320907c66538e9f8e4011f5586
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
This commit is contained in:
Luca Beldi 2018-09-28 19:51:55 +01:00
parent 155ae07b70
commit 98ec8bed19
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/widgets/widgets/qlabel.cpp
View File

@ -1098,7 +1098,7 @@ void QLabel::paintEvent(QPaintEvent *)
QImage scaledImage = QImage scaledImage =
d->cachedimage->scaled(scaledSize, d->cachedimage->scaled(scaledSize,
Qt::IgnoreAspectRatio, Qt::SmoothTransformation); Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
d->scaledpixmap = new QPixmap(QPixmap::fromImage(scaledImage)); d->scaledpixmap = new QPixmap(QPixmap::fromImage(std::move(scaledImage)));
d->scaledpixmap->setDevicePixelRatio(devicePixelRatioF()); d->scaledpixmap->setDevicePixelRatio(devicePixelRatioF());
} }
pix = *d->scaledpixmap; pix = *d->scaledpixmap;