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  1. Qt
  2. QTBUG-44863

Scaled SVG degraded quality in QML

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Details

    • 4bd5d6ced07d2d0e643a13e7cebb228c521d2046

    Description

      Rendering of scaled SVG resources in QML shows a degraded quality.
      I created some SVG images on my own with Inkscape.
      As long as they stay 1:1 they look OK in QML. When they are scaled, they seem to loose every vectorial property they have. Seems like the 1:1 image is scaled as if it was a bitmap.

      This results in a bad looking aliasing effect.
      See attached files.

      dimmer-back.svg: the test SVG file
      SVGTest.qml: can be tested with qmlscene
      qml_aliasing.png: the screenshot of the rendering in QML
      scaling_ok.png: the screenshot of the KDE preview. Any other software scales the SVG file OK (Gwenview, Gimp, etc..)

      Attachments

        1. svg-aliasing.tar.gz
          14 kB
          Massimo Callegari

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-66833 SVG images are blurry

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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-89734 The "sourceSize" property value of the "Image" item is wrong

          • 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-58416 QtQuick Image: SVG Images are not properly scaled with High DPI Scaling

          • P4: Low - Would be nice to fix, but it's not very important.
          • Closed
          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-94855 SVG rendering assumes 90 dpi

          • 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-58082 tst_qquickimage::imageSource() failed

          • P0: Blocker - MUST be fixed ASAP. This includes issues that prevent/block further Qt development; Legal issues & Serious data loss issues.
          • Closed

          Suggestion - Public suggestions QTBUG-97450 Default sourceSize to implicit size * DPR for scalable images

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Activity

            People

              vgt Eirik Aavitsland
              mcallegari79 Massimo Callegari
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              Dates

                Created:
                Updated:
                Resolved: