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  1. Qt
  2. QTBUG-139733

[Regression 6.8.3 -> 6.8.4] A transparent Window cannot be rendered properly if backend is OpenGL

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    • Windows
    • e413c726c (tqtc/lts-6.8)

      A minimal snippet:

      import QtQuick

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    color: "transparent"
    flags: Qt.FramelessWindowHint

    Text {
        anchors.centerIn: parent
        text: "Hello World!"
        font.pixelSize: 30
    }
}

      With 6.8.4, the default Direct3D result looks like:

      Transparent background with text visible. Perfect.

      With 6.8.4, the result of 

      QQuickView::setGraphicsApi(QSGRendererInterface::OpenGL);

      looks like:

      Well, you can't see anything. It is completely black.

      The problem does not happen back in 6.8.3. Both OpenGL and Direct3D render the window as expected.

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        For Gerrit Dashboard: QTBUG-139733
        # Subject Branch Project Status CR V
        674168,3 qpa: Windows: Window initialization: Bring back applyBlurBehindWindow tqtc/lts-6.8 qt/tqtc-qtbase Status: MERGED +2 0

            owolff Oliver Wolff
            luqiaochen Luqiao Chen
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes