- guint width = vik_viewport_get_width(vp), height = vik_viewport_get_height(vp);
- gint32 x, y;
- vgl->corner.zone = utm_middle.zone;
- vgl->corner.letter = utm_middle.letter;
- VikCoord corner_coord;
- vik_coord_load_from_utm ( &corner_coord, vik_viewport_get_coord_mode(vp), &(vgl->corner) );
- vik_viewport_coord_to_screen ( vp, &corner_coord, &x, &y );
- if ( (x < 0 || x < width) && (y < 0 || y < height) && x+vgl->width > 0 && y+vgl->height > 0 )
- vik_viewport_draw_pixbuf ( vp, vgl->pixbuf, 0, 0, x, y, vgl->width, vgl->height ); /* todo: draw only what we need to. */
+ layer_width = round(vgl->width * vgl->mpp_easting / xmpp);
+ layer_height = round(vgl->height * vgl->mpp_northing / ympp);
+
+ /* rescale if necessary */
+ if (layer_width == vgl->scaled_width && layer_height == vgl->scaled_height && vgl->scaled != NULL)
+ pixbuf = vgl->scaled;
+ else
+ {
+ pixbuf = gdk_pixbuf_scale_simple(
+ vgl->pixbuf,
+ layer_width,
+ layer_height,
+ GDK_INTERP_BILINEAR
+ );
+
+ if (vgl->scaled != NULL)
+ g_object_unref(vgl->scaled);
+
+ vgl->scaled = pixbuf;
+ vgl->scaled_width = layer_width;
+ vgl->scaled_height = layer_height;
+ }