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  1. Qt
  2. QTBUG-60562

REG [within 5.9]: Windows font engine rendering broken when using message box with rich text

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Details

    • Bug
    • Resolution: Done
    • P1: Critical
    • 5.9.0 Beta 4
    • 5.9.0 Beta 3
    • GUI: Font handling
    • None
    • Win 10 64bit, MSVC2015 U3

    Description

      Normal rendering, no high DPI scaling involved. Freetype is not affected.

      QMessageBox::information(...."<html><head/><body><p>bla <b> bold bla</b> blub"
                       "<i>italic</i>blob</p></body></html>");

      Notably shows in Qt Creator 'File changed on disk' dialog.

      QLabel(0x270dbf623a0, name="qt_msgboxex_icon_label") "" QFont( "Segoe UI,9,-1,5,50,0,0,0,0,0" )
QLabel(0x270dbf62250, name="qt_msgbox_label") "<html><head/><body><p>bla <b> bold bla</b> blub<i>italic</i>blob</p></body></html>" QFont( "Segoe UI,9,-1,5,50,0,0,0,0,0" )

      Appears to be Vista style only. This is then related to the QWindowsVistaStyle::drawPrimitive() drawing a white theme panel on message boxes at src\widgets\styles\qwindowsvistastyle.cpp:788 and caused by some alpha blending issue.

      Introduced by "Cleanup rgb32 text-blending code path" d160809015e49d6435dc876135b88f17af4f8008 https://codereview.qt-project.org/#/c/184708/

      Attachments

        1. qtbug60562_diag.diff
          5 kB
        2. qtbug60562_log.txt
          6 kB
        3. qtbug60562.jpg
          qtbug60562.jpg
          10 kB
        4. qtbug60562.zip
          1 kB
        5. sample.png
          sample.png
          12 kB

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-60787 Message boxes look weird on Windows

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-60906 Save Form dialog of designer has ugly font

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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-60571 Vistastyle paints invalid pixel data in backing store

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-60469 [5.9 REG] Garbled text rendering with QLabel and alpha channel

          • 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
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          Activity

            People

              allan.jensen Allan Sandfeld Jensen
              kleint Friedemann Kleint
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              Dates

                Created:
                Updated:
                Resolved:

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