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  1. Qt
  2. QTBUG-37095

Canvas element renders fuzzy on retina displays

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Details

    • 9182797dec1897cda4e2e0368a16ddbd5c18b031 62271c22e5472b9a6c4688fa906bf5d7cfda1953

    Description

      The canvas element renders very fuzzy on a retina display. It looks like it is pixmap-backed, and the devicePixelRatio of that pixmap is left at the default (like 1).

      For an example, take a look at the QML profiler time-line in Qt Creator.

       

      Attachments

        1. px_scaled.png
          px_scaled.png
          23 kB
        2. px_unscaled.png
          px_unscaled.png
          6 kB
        3. scaled.png
          scaled.png
          10 kB
        4. unscaled.png
          unscaled.png
          7 kB
        5. QMLCanvasBug.zip
          3 kB
        6. iphone6plus.jpg
          iphone6plus.jpg
          93 kB
        7. macbook_retina.jpg
          macbook_retina.jpg
          115 kB

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-52942 Canvas is blurred in HighDPI

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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-54984 QQuickPaintedItem with High DPI display

          • 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-59170 [REG 5.7->5.8] Canvas getImageData doesn't handle High DPI

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-37095
          # Subject Branch Project Status CR V
          172894,5 Canvas: Implement high-DPI render mode 5.6 qt/qtdeclarative Status: MERGED +2 0
          172908,5 Canvas: Repaint on devicePixelRatio Change 5.9 qt/qtdeclarative Status: MERGED +2 0
          204784,2 add qt.quick.canvas logging category, show size change due to DPR 5.9 qt/qtdeclarative Status: MERGED +2 0
          204787,2 Canvas: Repaint on devicePixelRatio Change 5.6.3 qt/qtdeclarative Status: DEFERRED 0 0

          Activity

            People

              sorvig Morten Sørvig
              erikv Erik Verbruggen
              Votes:
              23 Vote for this issue
              Watchers:
              39 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Gerrit Reviews

                  There are no open Gerrit changes