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author | Morten Johan Sørvig <morten.sorvig@theqtcompany.com> | 2015-06-19 16:40:39 +0200 |
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committer | Simon Hausmann <simon.hausmann@theqtcompany.com> | 2015-07-30 04:04:01 +0000 |
commit | dcd2debe625841ee8cba6d13a56cde7613c40358 (patch) | |
tree | d1d1e6c98d9cc5d81f29a389721acca6a9f7d150 /src/gui/painting/qpaintdevice.cpp | |
parent | 0167ace5f0a7e5ad80ce95efc99c86235bcf8c0d (diff) | |
download | qtbase-dcd2debe625841ee8cba6d13a56cde7613c40358.tar.gz |
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 <paul.tvete@theqtcompany.com>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
Diffstat (limited to 'src/gui/painting/qpaintdevice.cpp')
-rw-r--r-- | src/gui/painting/qpaintdevice.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/gui/painting/qpaintdevice.cpp b/src/gui/painting/qpaintdevice.cpp index bbf8e8f170..2332d11a03 100644 --- a/src/gui/painting/qpaintdevice.cpp +++ b/src/gui/painting/qpaintdevice.cpp @@ -79,7 +79,13 @@ Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, QPaintDevice int QPaintDevice::metric(PaintDeviceMetric m) const { + // Fallback: A subclass has not implemented PdmDevicePixelRatioScaled but might + // have implemented PdmDevicePixelRatio. + if (m == PdmDevicePixelRatioScaled) + return this->metric(PdmDevicePixelRatio) * devicePixelRatioFScale(); + qWarning("QPaintDevice::metrics: Device has no metric information"); + if (m == PdmDpiX) { return 72; } else if (m == PdmDpiY) { |