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

      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/

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            allan.jensen Allan Sandfeld Jensen
            kleint Friedemann Kleint
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              Created:
              Updated:
              Resolved:

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