1 files changed, 3 insertions, 0 deletions
diff --git a/src/render.h b/src/render.h
index c0570d2f..0be9ae97 100644
--- a/src/render.h
+++ b/src/render.h
@@ -30,6 +30,9 @@ enum {
 	SCALE_INVMONO
 };
 
+extern void render_scale(float val, float max, int scale,
+                         float *rp, float *gp, float *bp);
+
 extern GdkPixbuf *render_get_image(DisplayWindow *dw);
 extern GdkPixbuf *render_get_colour_scale(size_t w, size_t h, int scale);