2 files changed, 9 insertions, 0 deletions
diff --git a/atari/plot.c b/atari/plot.c
index 536b4dd5a..16e19149c 100755
--- a/atari/plot.c
+++ b/atari/plot.c
@@ -89,6 +89,14 @@ int atari_plotter_finalise( void )
 	delete_font_plotter( fplotter );
 }
 
+void plot_set_knockout( int set ){
+	if( set == 0 ) {
+		plot.option_knockout = false;		
+	} else {
+		plot.option_knockout = true;
+	}
+}
+
 bool plot_rectangle( int x0, int y0, int x1, int y1,
 							const plot_style_t *style )
 {
diff --git a/atari/plot.h b/atari/plot.h
index 9b7dc5f1f..7be7d6aa3 100755
--- a/atari/plot.h
+++ b/atari/plot.h
@@ -26,6 +26,7 @@ struct rect;
 
 int atari_plotter_init( char*, char * );
 int atari_plotter_finalise( void );
+void plot_set_knockout( int set );
 bool plot_get_clip(struct rect * out);
 bool plot_clip(const struct rect *clip);
 bool plot_rectangle( int x0, int y0, int x1, int y1,const plot_style_t *style );