QPrinter: PdfFormat and transparency



  • Hi,

    I'm exporting a QGraphicsView to various file formats: actually pdf and the image formats supported by QImage. My problem is that I loose my items transparency when exporting to pdf although the code is very similar.
    Here is the image export code:

    @QImage image(size, QImage::Format_ARGB32_Premultiplied);
    image.fill( view->backgroundBrush().color().rgba() );
    paintOnDevice (&image, view);
    image.save( fileName );
    @
    and here is the pdf export
    @QPrinter printer (QPrinter::HighResolution);
    printer.setOutputFileName( QString(fileName) );
    printer.setOutputFormat( QPrinter::PdfFormat );
    printer.setPaperSize( size , QPrinter::Point );
    paintOnDevice (&printer, view);
    @
    where paintOnDevice is simply:
    @QPainter painter(device);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing | QPainter::SmoothPixmapTransform);
    view->render( &painter );
    painter.end();
    @
    and where view is a QGraphicsView pointer.

    I'm using Qt 4.7.0 and I get the same results on Mac OS X and Ubuntu Maverick 64bits. On windows, I'm using an older version (4.6.2) but I get the same results.
    Any help would be appreciated

    Dominique


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