Enable non-integer device pixel ratio

Work around QPaintDevice::metric's int return type
by adding a new metric that returns a scaled devicePixelRatio.
Choose a scale factor that gives us more than enough
range.

The QPaintDevice::devicePixelRatio() convenience accessor
is public API and can unfortunately not be changed
to return a qreal. Add devicePixelRatioF() which
returns the (unscaled) devicePixelRatio.

Change all call sites of QPaintDevice::devicePixelRatio()
to use QPainDevice::devicePixelRatioF().

Task-number: QTBUG-46615
Change-Id: I97ec4000fe379b7ff5e1624a871ae2512790aad9
Reviewed-by: Paul Olav Tvete <[email protected]>
Reviewed-by: Lars Knoll <[email protected]>

1 files changed, 0 insertions, 2 deletions

diff --git a/src/gui/kernel/qrasterwindow.cpp b/src/gui/kernel/qrasterwindow.cpp
index c04eb714202..fc1739ca0e0 100644
--- a/src/gui/kernel/qrasterwindow.cpp
+++ b/src/gui/kernel/qrasterwindow.cpp
@@ -108,8 +108,6 @@ int QRasterWindow::metric(PaintDeviceMetric metric) const
     switch (metric) {
     case PdmDepth:
         return d->backingstore->paintDevice()->depth();
-    case PdmDevicePixelRatio:
-        return d->backingstore->paintDevice()->devicePixelRatio();
     default:
         break;
     }