Initial commit

patch/alpha.c

@@ -0,0 +1,19 @@
+float
+clamp(float value, float lower, float upper) {
+	if (value < lower)
+		return lower;
+	if (value > upper)
+		return upper;
+	return value;
+}
+
+void
+changealpha(const Arg *arg)
+{
+	if ((alpha > 0 && arg->f < 0) || (alpha < 1 && arg->f > 0))
+		alpha += arg->f;
+	alpha = clamp(alpha, 0.0, 1.0);
+	xloadcols();
+	redraw();
+}
+