From 13ef72dc0350ae98961e2e721c7fb0b8167a04b6 Mon Sep 17 00:00:00 2001
From: Tomas Aparicio <tomas@aparicio.me>
Date: Tue, 3 Nov 2015 07:54:40 +0000
Subject: [PATCH] refactor(resize): clone options by value

---
 resize.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/resize.go b/resize.go
index d6dce26..f0ba8e3 100644
--- a/resize.go
+++ b/resize.go
@@ -23,8 +23,8 @@ func Resize(buf []byte, o Options) ([]byte, error) {
 		return nil, err
 	}
 
-	// Define default options
-	applyDefaults(&o, imageType)
+	// Clone and define default options
+	o = applyDefaults(o, imageType)
 
 	if IsTypeSupported(o.Type) == false {
 		return nil, errors.New("Unsupported image output type")
@@ -121,7 +121,7 @@ func Resize(buf []byte, o Options) ([]byte, error) {
 	return vipsSave(image, saveOptions)
 }
 
-func applyDefaults(o *Options, imageType ImageType) {
+func applyDefaults(o Options, imageType ImageType) Options {
 	if o.Quality == 0 {
 		o.Quality = QUALITY
 	}
@@ -134,6 +134,7 @@ func applyDefaults(o *Options, imageType ImageType) {
 	if o.Interpretation == 0 {
 		o.Interpretation = INTERPRETATION_sRGB
 	}
+	return o
 }
 
 func normalizeOperation(o *Options, inWidth, inHeight int) {