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List:       koffice-devel
Subject:    Make KPresenter draw a page using w/h pixel values instead of zoom
From:       Karl-Heinz Zimmer <khz () kde ! org>
Date:       2004-01-13 0:10:04
Message-ID: 200401130110.10929 () postmaster ! bugcops ! org
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Hi,

looking at kpresenter/sidebar.cc I just found something quite
strange in the method 

   QPixmap ThumbBar::getSlideThumb(int slideNr) const


1.  the page is drawn at zoom level 60% into a pQPixmap

    view->getCanvas()->drawPageInPix( pix, slideNr, 60 );

2.  then the pixmap is scaled (or stretched. resp.) to the desired
    size of 120x130 or 130x120 or 130x130 pixels


OK, next in  kozoomhandler.cc  the respective method

    void KoZoomHandler::setZoomAndResolution( int zoom,
                                              int dpiX,
                                              int dpiY )

to me looks like there actually is no way to achieve output
with different zoom levels for x and y.

Now my problem is: We would like to do the same as is done in

   QPixmap ThumbBar::getSlideThumb(int slideNr) const

but we want the resulting pixmap to be very exact: so no way to
use that hack
    const QImage img(pix.convertToImage().smoothScale( w, h,
                                              QImage::ScaleMin ));
    pix.convertFromImage(img);

We just want KPresenter to render directly into several of our
desired target sizes, which will be 640x480, 704x576, 800x600, ...

    The reason for this is: automatically generate output pixmaps
    for a small independent presentation viewer app my son and I
    are developing as an exercise...
    Therefor we need high-quality slide pixmaps in different
    given sizes - stretching the pixmap /after/ rendering is
    suboptimal and would result in KPresenter generated slide
    images look worse than OpenOffice Impress generated ones
    - something I would rather not want to see happen.  ;-)

TIA !

Karl-Heinz
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