AuroraMiddleware/qt5base-lts
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Round physical dpi when calculating scale factor

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(For the QT_USE_PHYSICAL_DPI use case)

The physical DPI is nominally computed from the physical
screen size, however when QT_USE_PHYSICAL_DPI is set
that size has typically been overridden with a fake
size by the user, such that the resulting DPI calculation
will yield some specific integer DPI.

Round this DPI value in order to arrive at a nice scale
factor, e.g. 144/96 = 1.5 instead of 144.01/96 = 1.5001

Change-Id: I665394e98a818b3a8f46408f3193cac4411f458d
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
This commit is contained in:
Morten Johan Sørvig 2021-03-04 15:30:48 +01:00
parent 0bd705d91b
commit ad10fd2a6f
1 changed files with 1 additions and 1 deletions
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2
src/gui/kernel/qhighdpiscaling.cpp
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@ -293,7 +293,7 @@ qreal QHighDpiScaling::rawScaleFactor(const QPlatformScreen *screen)
QSize sz = screen->geometry().size();
QSizeF psz = screen->physicalSize();
qreal platformPhysicalDpi = ((sz.height() / psz.height()) + (sz.width() / psz.width())) * qreal(25.4 * 0.5);
factor = qreal(platformPhysicalDpi) / qreal(platformBaseDpi.first);
factor = qRound(platformPhysicalDpi) / qreal(platformBaseDpi.first);
} else {
const QDpi platformLogicalDpi = QPlatformScreen::overrideDpi(screen->logicalDpi());
factor = qreal(platformLogicalDpi.first) / qreal(platformBaseDpi.first);