From a46d144fedd5c6bf45edf91805e1ac72f4848b12 Mon Sep 17 00:00:00 2001
From: Michael Fogleman <fogleman@gmail.com>
Date: Sat, 20 Feb 2016 15:42:36 -0500
Subject: [PATCH] support alpha in SetHexColor

---
 context.go | 4 ++--
 util.go    | 7 ++++++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/context.go b/context.go
index 247d6b4..6ba4120 100644
--- a/context.go
+++ b/context.go
@@ -141,8 +141,8 @@ func (dc *Context) SetColor(c color.Color) {
 }
 
 func (dc *Context) SetHexColor(x string) {
-	r, g, b := parseHexColor(x)
-	dc.SetRGB255(r, g, b)
+	r, g, b, a := parseHexColor(x)
+	dc.SetRGBA255(r, g, b, a)
 }
 
 func (dc *Context) SetRGBA255(r, g, b, a int) {
diff --git a/util.go b/util.go
index 8d340fa..3cd3258 100644
--- a/util.go
+++ b/util.go
@@ -48,8 +48,9 @@ func imageToRGBA(src image.Image) *image.RGBA {
 	return dst
 }
 
-func parseHexColor(x string) (r, g, b int) {
+func parseHexColor(x string) (r, g, b, a int) {
 	x = strings.TrimPrefix(x, "#")
+	a = 255
 	if len(x) == 3 {
 		format := "%1x%1x%1x"
 		fmt.Sscanf(x, format, &r, &g, &b)
@@ -61,6 +62,10 @@ func parseHexColor(x string) (r, g, b int) {
 		format := "%02x%02x%02x"
 		fmt.Sscanf(x, format, &r, &g, &b)
 	}
+	if len(x) == 8 {
+		format := "%02x%02x%02x%02x"
+		fmt.Sscanf(x, format, &r, &g, &b, &a)
+	}
 	return
 }