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  1. Qt
  2. QTBUG-98388

Vertical QPainter::drawLine() result on QWidget is skewed

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 6.2.3, 6.3.0 Alpha
    • 6.2.1
    • GUI: Painting
    • None
    • macOS Monterey 12.0.1, Apple clang version 13.0.0 (clang-1300.0.29.3)
    • macOS
    • 4f69a1e1d2ae8f475bbd7e1d3c1ca92487c6ea90 (qt/qtbase/dev) 9ed75c72bf08ab04c7e5a67dae3d026f2e178d18 (qt/qtbase/6.2) c07e85b15d298bdccbfef551448eba966f7bf306 (qt/qtbase/6.2.2)

    Description

      When using QPainter::drawLine() on a QWidget, a vertical line appears to be skewed. This issue does not occur on either Windows or Linux.

      I have attached a small test case, along with two images: the skewed result on macOS, and the expected result which occurs on Linux and Windows using this test case.

      Whether or not the QWidget is a part of the QDockWidget in the test case or not seems to have no bearing on this phenomenon.

      UPDATE: I can confirm there is a regression between Qt 6.2.1 and Qt 5.15.2 on macOS. The latter gives the expected result, the former does not.

      Attachments

        1. linux_win_result.png
          linux_win_result.png
          48 kB
        2. macos_result.png
          macos_result.png
          334 kB
        3. main.cpp
          1 kB

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-98911 QPainter incorrect drawing when using Qt Static lib on Intel or Rosetta 2

          • 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-98403 tst_QPainter fails with macOS 12 x86 in developer build tests

          • 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-99280 Splash screen appears on top model dialog with dynamic vs behind with static

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-98388
          # Subject Branch Project Status CR V
          382057,4 Clean up line clipping code in rasterizer dev qt/qtbase Status: MERGED +2 0
          382169,2 Clean up line clipping code in rasterizer 6.2.2 qt/qtbase Status: MERGED +2 0
          382170,2 Clean up line clipping code in rasterizer 6.2 qt/qtbase Status: MERGED +2 0

          Activity

            People

              vgt Eirik Aavitsland
              kaichiuchu Michael Rodriguez
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              Dates

                Created:
                Updated:
                Resolved:

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