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  1. Qt
  2. QTBUG-79295

Scaling QTransform::mapRect(QRect) can differ from mapRect(QRectF).toRect()

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Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 5.12.5, 5.13.2, 5.14.0 Alpha
    • GUI: Painting
    • None

    Description

      If only scaling, QTransform::mapRect(QRect) rounds x1 and width, while mapRect(QRectF).toRect() in effect rounds x1 and x2. This can give a one pixel difference in resulting width and/or height.

      Possibly risky to change in Qt 5, but should at least be doable for Qt 6.

       

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          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-78962 setClipRect misbehavior for hi-dpi scaling with QRect overload vs. QRectF overload

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

                Created:
                Updated:

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