From 1be88eeb17b53333fbb0dad537c34a34ed9d7333 Mon Sep 17 00:00:00 2001
From: faiface <faiface@ksp.sk>
Date: Sun, 19 Mar 2017 20:09:05 +0100
Subject: [PATCH] optimize color.NRGBA -> pixel.NRGBA conversion

---
 color.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/color.go b/color.go
index 0303704..7345e4a 100644
--- a/color.go
+++ b/color.go
@@ -82,6 +82,14 @@ func nrgbaModel(c color.Color) color.Color {
 	if c, ok := c.(NRGBA); ok {
 		return c
 	}
+	if c, ok := c.(color.NRGBA); ok {
+		return NRGBA{
+			R: float64(c.R) / 255,
+			G: float64(c.G) / 255,
+			B: float64(c.B) / 255,
+			A: float64(c.A) / 255,
+		}
+	}
 	r, g, b, a := c.RGBA()
 	if a == 0 {
 		return NRGBA{0, 0, 0, 0}