From 5ca57a1e6846e95bb8ab22f928c64f38bcabeccd Mon Sep 17 00:00:00 2001
From: Tomas Aparicio <tomas@aparicio.me>
Date: Wed, 28 Sep 2016 00:14:29 +0100
Subject: [PATCH] fix(background): pass proper background RGB color

---
 resize.go | 1 -
 vips.go   | 3 ++-
 vips.h    | 8 +++-----
 3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/resize.go b/resize.go
index 9d78f7d..4ccc92b 100644
--- a/resize.go
+++ b/resize.go
@@ -330,7 +330,6 @@ func imageFlatten(image *C.VipsImage, imageType ImageType, o Options) (*C.VipsIm
 	if imageType != PNG || o.Background == ColorBlack {
 		return image, nil
 	}
-
 	return vipsFlattenBackground(image, o.Background)
 }
 
diff --git a/vips.go b/vips.go
index 535f5ad..33ab442 100644
--- a/vips.go
+++ b/vips.go
@@ -304,7 +304,8 @@ func vipsFlattenBackground(image *C.VipsImage, background Color) (*C.VipsImage,
 	}
 
 	if vipsHasAlpha(image) {
-		err := C.vips_flatten_background_brigde(image, &outImage, (*C.double)(&backgroundC[0]))
+		err := C.vips_flatten_background_brigde(image, &outImage,
+			backgroundC[0], backgroundC[1], backgroundC[2])
 		if int(err) != 0 {
 			return nil, catchVipsError()
 		}
diff --git a/vips.h b/vips.h
index c4e6ed8..3cbe6cf 100644
--- a/vips.h
+++ b/vips.h
@@ -277,12 +277,10 @@ vips_is_16bit (VipsInterpretation interpretation) {
 }
 
 int
-vips_flatten_background_brigde(VipsImage *in, VipsImage **out, double background[3]) {
-	background[0] *= 256;
-	background[1] *= 256;
-	background[2] *= 256;
-
+vips_flatten_background_brigde(VipsImage *in, VipsImage **out, double r, double g, double b) {
+	double background[3] = {r, g, b};
 	VipsArrayDouble *vipsBackground = vips_array_double_new(background, 3);
+	
 	return vips_flatten(in, out,
 		"background", vipsBackground,
 		"max_alpha", vips_is_16bit(in->Type) ? 65535.0 : 255.0,