[Gnome-print] incompatible font changes

[Lauris Kaplinski <lauris helixcode com>]

Hello

I hope, this is last incompatible change in gnome-font subsystem:

1. GnomeDisplayFont is now typedef of GnomeRFont. To access attributes,
use methods:

gnome_display_font_get_face (const GnomeDisplayFont * gdf);
gnome_display_font_get_font (const GnomeDisplayFont * gdf);
gnome_display_font_get_scale (const GnomeDisplayFont * gdf);
gnome_display_font_get_x_font_name (const GnomeDisplayFont * gdf);
gnome_display_font_get_gdk_font (const GnomeDisplayFont * gdf);

Better yet, modify code, to use gnome_rfont_render_xxx_gdk_drawable
The latter at moment does not use X fonts at all, but we can easily modify
it, so if:
- transformation matrix is uniform scaling
- font is available for x
- color is solid
- antialiasing is not needed
it can draws, using standard X fonts, otherwise uses pixmaps.

2. GnomeFontSelection and GnomeFontDialog return GnomeFont, instead of
GnomeDisplayFont.

The logic should be obvious: GnomeDisplayFont is scaled to certain pixel
size, but dialog should determine only font master size.

To get RFont (== DisplayFont) for drawing:

GnomeFont * font;
GnomeRFont * rfont;
gdouble affine[6];

font = gnome_font_selection_get_font (sel);
art_affine_scale (affine, zoomx, -zoomy); /* Or use non-trivial affine */
rfont = gnome_font_get_rfont (font, affine);
gnome_font_unref (font);

Dialog font sample is a bit ugly at moment, and usually crashes for
symbol fonts. I correct that ASAP.

Regards,
Lauris