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  1. Qt
  2. QTBUG-86344

Investigate UI rendering at fractional scale factors

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    Details

    • Type: Task
    • Status: Open
    • Priority: P2: Important
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: 5.15.3
    • Component/s: GUI: High-DPI
    • Labels:
      None
    • Platform/s:
      All

      Description

      We're looking to make Qt 6 use the native UI scale directly (without rounding), which means that Qt GUIs may be rendered at e.g. 1.25x and 1.75x.

      This change was implemented in https://codereview.qt-project.org/c/qt/qtbase/+/273956 .

      This requires that Qt applications are actually usable at fractional scale factors, and that any visual artifacts are not too jarring. Running at an integer scale factor will give the best visual results, which is something we should consider pointing out in the documentation.

      App developers can enable rounding using  the QGuiApplication::setHighDpiScaleFactorRoundingPolicy() API.

      Test cases:

      • Qt Quick Controls 2 (should be OK)
      • Qt Wigets styles: (examples/widgets/gallery)
        • Fusion style at 1.25x:
      • Some missing frame lines, otherwise OK.
        • Vista style

        Attachments

        1. ce_shapedframe-clip.png
          ce_shapedframe-clip.png
          446 kB
        2. ce_shapedframe-noclip.png
          ce_shapedframe-noclip.png
          453 kB
        3. image-2020-09-16-11-51-35-698.png
          image-2020-09-16-11-51-35-698.png
          1.83 MB
        4. widget-gallery-1.25x.png
          widget-gallery-1.25x.png
          177 kB
        5. widget-gallery-1.25x-downscale.png
          widget-gallery-1.25x-downscale.png
          170 kB
        6. widget-gallery-vista-125x.jpg
          widget-gallery-vista-125x.jpg
          130 kB

          Issue Links

          depends on

          Task - A task that needs to be done. QTBUG-58611 Qt 6: Use qreal in QtWidgets drawing/styles code

          • Not Evaluated - Not yet evaluated/prioritized
          • Reported
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-88720 Control widgets borders missing when high-dpi and scaling enabled

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-88403 examples/widgets/widgets/styles looks broken with fractional scaling

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-64853 HiDPI: The region of when call QWidgetPrivate::setSystemClip does not match the region that was imported when call QPlatformBackingStore::beginPaint

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-101008 Using Text.NativeRendering results in characters drawn too close to each other with fractional scale factors

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-90975 [REG: 5.15-6.0] QLineEdit frame blinks at 150 % screen scaling on Windows when mouse enters its area

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-86977 Qml Text underline changes on resize with fractional display scale factors

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. QTBUG-96223 Painting glitches under fractional DPR scaling: collection task

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-96465 Text's underline thickness is unstable on fractional screen's scale factors

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-80228 HighDPI: Using QT_SCALE_FACTOR_ROUNDING_POLICY=PassThrough with fractional scaling yields cosmetic issues

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-91239 Porting to Qt6: high dpi scale factor default rounding policy not documented

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-91393 Widgets alignments collapse and text getting chopped off when scaling to 125%

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-93417 HighDPI: Setting setHighDpiScaleFactorRoundingPolicy() to PassThrough with fractional scaling yields cosmetic issues with QGraphicsView

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-107083 Windows/125%: Borders of "Layout" sometimes disappear in Qt Designer.

          • P4: Low - Would be nice to fix, but it's not very important.
          • Closed
          For Gerrit Dashboard: QTBUG-86344
          # Subject Branch Project Status CR V
          218039,3 Fix qstylesheetstyle clip border error 5.11 qt/qtbase Status: NEW -1 0

            Activity

              People

              Assignee:
              sorvig Morten Sørvig
              Reporter:
              sorvig Morten Sørvig
              PM Owner:
              Veli-Pekka Heinonen Veli-Pekka Heinonen
              Votes:
              10 Vote for this issue
              Watchers:
              23 Start watching this issue

                Dates

                Created:
                Updated: