Handling transparency with gdk_pixmap_create_from_xpm()

[Rich Burridge <Rich Burridge Sun COM>]

Hi,

I'm converting one of my applications (faces - faces.sourceforge.net)
from Gtk 1.x to Gtk 2.x. I'm seeing an inconsistency with the
gdk_pixmap_create_from_xpm() call.

I had a routine:

int
get_xpm_icon(char *name, enum icon_type itype)   /* Load XPM icon file. */
{
    GdkBitmap *mask;
    GdkPixmap *pixmap;

    if ((pixmap = gdk_pixmap_create_from_xpm(GDK_ROOT_PARENT(),
                                             &mask, NULL, name)) == NULL) {
        return(-1);
    }

    images[(int) itype] = pixmap;

    return(0);
}

which I've adjusted to:

int
get_xpm_icon(char *name, enum icon_type itype)   /* Load XPM icon file. */
{
    GdkBitmap *mask;
    GdkPixmap *pixmap;

    if ((pixmap = gdk_pixmap_create_from_xpm(gdk_get_default_root_window(),
                                             &mask, NULL, name)) == NULL) {
        return(-1);
    }

    images[(int) itype] = pixmap;

    return(0);
}

I.e. changed GDK_ROOT_PARENT to gdk_get_default_root_window

With Gtk 1.x the transparent pixels were shown in white, whereas now they
are black. Did I just get lucky?

I've tried doing:

...
    GdkColor *color;

    gdk_color_parse("white", &color);
    if ((pixmap = gdk_pixmap_create_from_xpm(gdk_get_default_root_window(),
                                             &mask, &color, name)) == NULL) {
...

and I get a pastel blue color for transparent bits.

What's the magic to get this right?

Thanks.