From 70f330c2b67f456f7e2825f794f617939de8e815 Mon Sep 17 00:00:00 2001
From: disintegration <disintegration.git@gmail.com>
Date: Sat, 1 Apr 2017 16:21:32 +0300
Subject: [PATCH] pixels: clamp functions optimizations

---
 pixels.go | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/pixels.go b/pixels.go
index ab21ace..3944e76 100644
--- a/pixels.go
+++ b/pixels.go
@@ -141,7 +141,7 @@ func convertPalette(p []color.Color) []pixel {
 }
 
 func getPaletteIndex(pal []pixel, px pixel) int {
-	var k int = 0
+	var k int
 	var dmin float32 = 4
 	for i, palpx := range pal {
 		d := px.R - palpx.R
@@ -287,21 +287,25 @@ func (p *pixelGetter) getPixelColumn(x int, buf *[]pixel) {
 }
 
 func f32u8(val float32) uint8 {
-	if val > 255.0 {
-		val = 255.0
-	} else if val < 0.0 {
-		val = 0.0
+	x := int64(val + 0.5)
+	if x > 255 {
+		return 255
 	}
-	return uint8(val + 0.5)
+	if x > 0 {
+		return uint8(x)
+	}
+	return 0
 }
 
 func f32u16(val float32) uint16 {
-	if val > 65535.0 {
-		val = 65535.0
-	} else if val < 0.0 {
-		val = 0.0
+	x := int64(val + 0.5)
+	if x > 65535 {
+		return 65535
+	}
+	if x > 0 {
+		return uint16(x)
 	}
-	return uint16(val + 0.5)
+	return 0
 }
 
 type pixelSetter struct {