Initial import.

src/libdraw/debug.c

@@ -0,0 +1,16 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+
+void
+drawsetdebug(int v)
+{
+	uchar *a;
+	a = bufimage(display, 1+1);
+	if(a == 0){
+		fprint(2, "drawsetdebug: %r\n");
+		return;
+	}
+	a[0] = 'D';
+	a[1] = v;
+}