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Details

Type: Bug
Resolution: Done
Priority: P4: Low
Fix Version/s: 5.14
Affects Version/s: 5.4.1
Component/s: GUI: High-DPI, GUI: Painting, Widgets: Widgets and Dialogs
Labels:
None

Description

On windows, Qt is by default, "Per-Monitor DPI Aware", as described there:
https://doc-snapshots.qt.io/qt5-5.4/highdpi.html

But QStyleHelper::dpiScaled(qreal value) which is used in many places of Qt, relies on the primary screen's DPI, not on the effective device DPI (as qt_effective_device_pixel_ratio does, (see qtbase\src\gui\image\qicon.cpp:118).

This means, for example, in a setup with one UltraHD screen and one standard screen, sizes are not proper on the non-primary screen.

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0001-WIP-Widget-style-Use-per-screen-DPI-in-QStyleHelper-.patch
23 kB
29 Nov '16 14:09
qtbug45055.zip
4 kB
31 Aug '15 13:20

Issue Links

relates to

QTBUG-40277 Adapt styles to High DPI

Closed

QTBUG-53022 HighDPi: Update scale factor setting for devicePixelRatio scaling (AA_EnableHighDpiScaling)

Closed

resulted in

QTBUG-82356 Calling QStyle::pixelMetric without style options lead to DPI scaling issues

Closed

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For Gerrit Dashboard: QTBUG-45055
#	Subject	Branch	Project	Status	CR	V
121977,6	Diaglib: Add class DebugProxyStyle.	dev	qt/qtbase	Status: MERGED	+2	0
124275,16	Widget style: Use per-screen DPI in QStyleHelper::dpiScaled()	dev	qt/qtbase	Status: ABANDONED	+2	0
258265,3	QStyle/QWidget: Avoid repetitive invocation of QStyleHelper::dpiScaled()	dev	qt/qtbase	Status: MERGED	+2	0
271429,5	Widget style: Use per-screen DPI in QStyleHelper::dpiScaled()	5.14	qt/qtbase	Status: MERGED	+2	0