Quick: Use devicePixelRatioF rather than devicePixelRatio

The integer version of devicePixelRatio cannot handle fractional ratios
and will lead to arithmetic exceptions for ratios between 0 and 1.

Change-Id: I4a06a12742fa85e6d2f0e24193ae796dec7e2f15
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/quick/items/context2d/qquickcontext2d.cpp b/src/quick/items/context2d/qquickcontext2d.cpp
index 5af2a7169c..8f21c3ec05 100644
--- a/src/quick/items/context2d/qquickcontext2d.cpp
+++ b/src/quick/items/context2d/qquickcontext2d.cpp
@@ -962,7 +962,7 @@ static QV4::ReturnedValue qt_create_image_data(qreal w, qreal h, QV4::ExecutionE
         *pixelData->d()->image = QImage(w, h, QImage::Format_ARGB32);
         pixelData->d()->image->fill(0x00000000);
     } else {
-        Q_ASSERT(image.width()== qRound(w * image.devicePixelRatio()) && image.height() == qRound(h * image.devicePixelRatio()));
+        Q_ASSERT(image.width()== qRound(w * image.devicePixelRatioF()) && image.height() == qRound(h * image.devicePixelRatioF()));
         *pixelData->d()->image = image.format() == QImage::Format_ARGB32 ? image : image.convertToFormat(QImage::Format_ARGB32);
     }