[mythtv] mythgallery aspect ratio patch

[Nigel Pearson]

> +    // calculate display pixel aspect ratio
> +    Display  *display = XOpenDisplay(NULL);
> +    int scr = DefaultScreen(display);
> +    double pixelaspect =
> +       ((double)DisplayWidthMM(display,scr) / (double)screenwidth) /
> +       ((double)DisplayHeightMM(display,scr) / (double)screenheight);
> +
> +    // calculate image aspect ratio
> +    double imageaspect =
> +       (double)m_image.width() / (double)m_image.height();
> +
> +    QImage img = m_image.smoothScale(
> +        (int) (screenheight * imageaspect / pixelaspect * m_zoom),
> +        (int) (screenheight * m_zoom),
> +        QImage::ScaleFree);


While this does work for X environemnts,
it will not help on OS X, or Windows.


An #ifdef ENABLE_X11 will suffice for now,
but in the long run, some of the video output
code probably needs to be abstracted into
libmyth?

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