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  1. Qt
  2. QTBUG-21329

QTransform::quadToQuad() doesn't work, when passed QRectFs

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Details

    • 48b1af941 (dev), 5ead2a3d6 (6.9), f5000beeb (6.8), 79debe2f2 (tqtc/lts-6.5), f91669320 (tqtc/lts-5.15)

    Description

      The following code:
      QTransform result;
      qDebug() << QTransform::quadToQuad(QRectF(0,0,1,1), QRectF(0,0,1,1), result);
      outputs "false".

      The reason is that QPolygonF::QPolygonF(const QRectF&) creates a polygon with 5 points, repeating the first, and quadToQuad only accepts polygons with four points.

      You can work around it by creating the polygons yourself, but that is significantly more verbose.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-127723 tst_QSvgRenderer::testFeFlood() failed on Ubuntu 24.04 X11 and offscreen

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-130999 does qt support this quadtoquad transform

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
          For Gerrit Dashboard: QTBUG-21329
          # Subject Branch Project Status CR V
          613982,4 Fix QTransform::quadToQuad() to work with QRectF dev qt/qtbase Status: MERGED +2 +1
          614606,2 Fix QTransform::quadToQuad() to work with QRectF 6.9 qt/qtbase Status: MERGED +2 0
          614657,2 Fix QTransform::quadToQuad() to work with QRectF 6.8 qt/qtbase Status: MERGED +2 0
          614785,3 Fix QTransform::quadToQuad() to work with QRectF tqtc/lts-6.5 qt/tqtc-qtbase Status: MERGED +2 0
          614863,3 Fix QTransform::quadToQuad() to work with QRectF tqtc/lts-5.15 qt/tqtc-qtbase Status: MERGED +2 0

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              srutledg Shawn Rutledge
              bgp2000 Björn Piltz
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              Dates

                Created:
                Updated:
                Resolved:

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