AuroraMiddleware/qt5base-lts
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

QPainter: support painting at DPR < 1

Browse Source 
QPainter was clamping the DPR at 1, which makes Qt paint
a blank window when the DPR is less than 1. Fix by
not clamping and treating only DPR == 1 as a special
case.

This is particularly relevant on Qt for WebAssembly
where the user can set the page scale to a value less
than 100%.

Fixes: QTBUG-111787
Change-Id: Iaa1f7a9b7837dd933c28380b5049422dc1ce9657
Reviewed-by: Jøger Hansegård <joger.hansegard@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
This commit is contained in:
Morten Sørvig 2023-11-09 14:57:02 +01:00
parent 67fa2585ac
commit 9e740c7266
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/gui/painting/qpainter.cpp
View File

@ -221,7 +221,7 @@ qreal QPainterPrivate::effectiveDevicePixelRatio() const
if (device->devType() == QInternal::Printer)
return qreal(1);
return qMax(qreal(1), device->devicePixelRatio());
return device->devicePixelRatio();
}
QTransform QPainterPrivate::hidpiScaleTransform() const
@ -1824,7 +1824,7 @@ bool QPainter::begin(QPaintDevice *pd)
Q_ASSERT(d->engine->isActive());
if (!d->state->redirectionMatrix.isIdentity() || d->effectiveDevicePixelRatio() > 1)
if (!d->state->redirectionMatrix.isIdentity() || !qFuzzyCompare(d->effectiveDevicePixelRatio(), qreal(1.0)))
d->updateMatrix();
Q_ASSERT(d->engine->isActive());