io/router: improve areaOp methods performance

name             old time/op  new time/op  delta
AreaOp_Decode-8  10.5ns ± 2%   6.2ns ± 3%  -41.50%  (p=0.000 n=10+10)
AreaOp_Hit-8     4.44ns ± 4%  3.57ns ± 2%  -19.59%  (p=0.000 n=10+10)

Signed-off-by: pierre <pierre.curto@gmail.com>

io/router/pointer_test.go

@@ -651,3 +651,22 @@ func BenchmarkRouterAdd(b *testing.B) {
 		})
 	}
 }
+
+var benchAreaOp areaOp
+
+func BenchmarkAreaOp_Decode(b *testing.B) {
+	ops := new(op.Ops)
+	pointer.Rect(image.Rectangle{Max: image.Pt(100, 100)}).Add(ops)
+	for i := 0; i < b.N; i++ {
+		benchAreaOp.Decode(ops.Data())
+	}
+}
+
+func BenchmarkAreaOp_Hit(b *testing.B) {
+	ops := new(op.Ops)
+	pointer.Rect(image.Rectangle{Max: image.Pt(100, 100)}).Add(ops)
+	benchAreaOp.Decode(ops.Data())
+	for i := 0; i < b.N; i++ {
+		benchAreaOp.Hit(f32.Pt(50, 50))
+	}
+}