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  1. Qt
  2. QTBUG-26795

Make sure QGraphicsView renders correctly on retina(HiDPI) display modes

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Details

    • Task
    • Resolution: Done
    • P2: Important
    • None
    • None
    • GUI: Painting, Widgets: GraphicsView
    • None

    • OS X 10.7.4, Qt 4.8.2,Linux, Windows

    Description

      I was pleasanty surpirsed to see Qt successfuly drawing GraphicsItems (both text and paths) under OS X HiDPI resolution modes. (tested using Quartz Debug)

      However two things break it if used:

      • QGLWidget as viewport
      • Item Cache

      Using any of these results in either all or selected items to be drawn pixelated.

      Attachments

        1. DevicePixelsRatioImageItemCache.diff
          5 kB
        2. qtbug26795_dpr1.jpg
          qtbug26795_dpr1.jpg
          156 kB
        3. qtbug26795_dpr2.jpg
          qtbug26795_dpr2.jpg
          149 kB
        4. qtbug26795.zip
          2 kB

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-52725 QGraphicsView: Caching modes of QGraphicsItem do not support High DPI (device pixel ratio scaling)

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

          Sub-task - The sub-task of the issue QTBUG-23870 Mac OSX: HighDPI Display support

          • 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-52667 Print preview appears rasterized in HighDPI mode

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-26795
          # Subject Branch Project Status CR V
          99813,1 Fix QGraphicsItem caching to work at full resolution on HiDPI/Retina displays. 5.4 qt/qtbase Status: ABANDONED -1 0
          108878,2 QGraphicsView: correct high-dpi caching. 5.5 qt/qtbase Status: ABANDONED +1 0
          142920,6 QGraphicsView: Improve high-DPI item caching dev qt/qtbase Status: ABANDONED 0 0
          190109,3 QGraphicsView: Improve high-DPI item caching dev qt/qtbase Status: MERGED +2 0

          Activity

            People

              sorvig Morten Sørvig
              mnaydenov Mihail Naydenov
              Votes:
              27 Vote for this issue
              Watchers:
              32 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Gerrit Reviews

                  There are no open Gerrit changes