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Details

Type: Bug
Resolution: Done
Priority: P3: Somewhat important
Fix Version/s: 5.6.0 Beta
Affects Version/s: 5.6
Component/s: GUI: Font handling
Labels:
None
Environment:
Windows 8.1

Commits:
50bda9e2aca69f67da6722e481ce4e9c1a21471b (qtbase/5.6, 5.11.2015, 5.6b)

Description

On Windows, there is the option to scale the ui under Control Panel\Appearance and Personalization\Display On a high dpi system the scaling would default to 200%, but can be manually set to e.g. 100%. That worked well with Qt 5.5 and QT_DEVICE_PIXEL_RATIO=auto, where Qt didn't apply scaling to Ui or text. On Qt 5.6, however, when using QT_AUTO_SCREEN_SCALE_FACTOR=1 the text scaling optin is igonred, and it does still scale the Ui by 2, and the text rendering is bad (spacing between characters).

Imho a regression and very difficult to work around.

This is a screenshot of Windows 8.1 on a HighDPI scree and system text scaling manually set to 100%

dpiscaling = 100%

Screens: 1, High DPI scaling: inactive
# 0 "\\.\DISPLAY1" Depth: 32 Primary: yes
  Geometry: 2880x1620+0+0 Available: 2880x1580+0+0
  Physical size: 344x193 mm  Refresh: 50 Hz Power state: 0
  Physical DPI: 212.651,213.202 Logical DPI: 96,96
  DevicePixelRatio: 1 Pixel density: 2
  Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0

dpiscaling = 100%, QT_AUTO_SCREEN_SCALE_FACTOR=1

Screens: 1, High DPI scaling: active
# 0 "\\.\DISPLAY1" Depth: 32 Primary: yes
  Geometry: 1440x810+0+0 (native: 2880x1620+0+0) Available: 1440x790+0+0
  Physical size: 344x193 mm  Refresh: 50 Hz Power state: 0
  Physical DPI: 106.326,106.601 Logical DPI: 48,48 (native: 96,96)
  High DPI scaling factor: 2 DevicePixelRatio: 2 Pixel density: 2
  Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0

dpiscaling = 200%

Screens: 1, High DPI scaling: inactive
# 0 "\\.\DISPLAY1" Depth: 32 Primary: yes
  Geometry: 2880x1620+0+0 Available: 2880x1548+0+0
  Physical size: 344x193 mm  Refresh: 50 Hz Power state: 0
  Physical DPI: 212.651,213.202 Logical DPI: 192,192
  DevicePixelRatio: 1 Pixel density: 2
  Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0

dpiscaling = 200%, QT_AUTO_SCREEN_SCALE_FACTOR=1

Screens: 1, High DPI scaling: active
# 0 "\\.\DISPLAY1" Depth: 32 Primary: yes
  Geometry: 1440x810+0+0 (native: 2880x1620+0+0) Available: 1440x774+0+0
  Physical size: 344x193 mm  Refresh: 50 Hz Power state: 0
  Physical DPI: 106.326,106.601 Logical DPI: 96,96 (native: 192,192)
  High DPI scaling factor: 2 DevicePixelRatio: 2 Pixel density: 2
  Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0