VikViewport *vp = VIK_VIEWPORT(data);
struct UTM utm_middle;
gdouble xmpp = vik_viewport_get_xmpp(vp), ympp = vik_viewport_get_ympp(vp);
VikViewport *vp = VIK_VIEWPORT(data);
struct UTM utm_middle;
gdouble xmpp = vik_viewport_get_xmpp(vp), ympp = vik_viewport_get_ympp(vp);
GdkPixbuf *pixbuf = vgl->pixbuf;
guint layer_width = vgl->width;
guint layer_height = vgl->height;
GdkPixbuf *pixbuf = vgl->pixbuf;
guint layer_width = vgl->width;
guint layer_height = vgl->height;
/* scale the pixbuf if it doesn't match our dimensions */
if ( xmpp != vgl->mpp_easting || ympp != vgl->mpp_northing )
{
/* scale the pixbuf if it doesn't match our dimensions */
if ( xmpp != vgl->mpp_easting || ympp != vgl->mpp_northing )
{
layer_width = round(vgl->width * vgl->mpp_easting / xmpp);
layer_height = round(vgl->height * vgl->mpp_northing / ympp);
layer_width = round(vgl->width * vgl->mpp_easting / xmpp);
layer_height = round(vgl->height * vgl->mpp_northing / ympp);
- pixbuf = gdk_pixbuf_scale_simple(
- vgl->pixbuf,
- layer_width,
- layer_height,
- GDK_INTERP_BILINEAR
- );
+
+ /* 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;
+ }
vik_viewport_coord_to_screen ( vp, &corner_coord, &x, &y );
if ( (x < 0 || x < width) && (y < 0 || y < height) && x+layer_width > 0 && y+layer_height > 0 )
vik_viewport_draw_pixbuf ( vp, pixbuf, 0, 0, x, y, layer_width, layer_height ); /* todo: draw only what we need to. */
vik_viewport_coord_to_screen ( vp, &corner_coord, &x, &y );
if ( (x < 0 || x < width) && (y < 0 || y < height) && x+layer_width > 0 && y+layer_height > 0 )
vik_viewport_draw_pixbuf ( vp, pixbuf, 0, 0, x, y, layer_width, layer_height ); /* todo: draw only what we need to. */