From e2b87bddd413d0be56dc5c620a33710803bf1e24 Mon Sep 17 00:00:00 2001
From: Eduard Urbach <e.urbach@gmail.com>
Date: Tue, 13 Jun 2017 17:40:29 +0200
Subject: [PATCH] Improved avatar downloader

---
 jobs/avatars/AvatarOriginalFileOutput.go | 11 +++++++++--
 jobs/avatars/AvatarWebPFileOutput.go     | 10 +++++++++-
 jobs/avatars/main.go                     |  4 ++--
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/jobs/avatars/AvatarOriginalFileOutput.go b/jobs/avatars/AvatarOriginalFileOutput.go
index 00cb50fd..6e1420eb 100644
--- a/jobs/avatars/AvatarOriginalFileOutput.go
+++ b/jobs/avatars/AvatarOriginalFileOutput.go
@@ -8,7 +8,6 @@ import (
 	"image/png"
 	"io/ioutil"
 
-	"github.com/animenotifier/arn"
 	"github.com/nfnt/resize"
 )
 
@@ -39,7 +38,15 @@ func (output *AvatarOriginalFileOutput) SaveAvatar(avatar *Avatar) error {
 	img := avatar.Image
 
 	if img.Bounds().Dx() != output.Size {
-		img = resize.Resize(arn.AvatarSmallSize, 0, img, resize.Lanczos3)
+		// Use Lanczos interpolation for downscales
+		interpolation := resize.Lanczos3
+
+		// Use Mitchell interpolation for upscales
+		if output.Size > img.Bounds().Dx() {
+			interpolation = resize.MitchellNetravali
+		}
+
+		img = resize.Resize(uint(output.Size), 0, img, interpolation)
 		buffer := new(bytes.Buffer)
 
 		var err error
diff --git a/jobs/avatars/AvatarWebPFileOutput.go b/jobs/avatars/AvatarWebPFileOutput.go
index bc48c05f..fb506b03 100644
--- a/jobs/avatars/AvatarWebPFileOutput.go
+++ b/jobs/avatars/AvatarWebPFileOutput.go
@@ -18,7 +18,15 @@ func (output *AvatarWebPFileOutput) SaveAvatar(avatar *Avatar) error {
 
 	// Resize if needed
 	if img.Bounds().Dx() != output.Size {
-		img = resize.Resize(arn.AvatarSmallSize, 0, img, resize.Lanczos3)
+		// Use Lanczos interpolation for downscales
+		interpolation := resize.Lanczos3
+
+		// Use Mitchell interpolation for upscales
+		if output.Size > img.Bounds().Dx() {
+			interpolation = resize.MitchellNetravali
+		}
+
+		img = resize.Resize(arn.AvatarSmallSize, 0, img, interpolation)
 	}
 
 	// Write to file
diff --git a/jobs/avatars/main.go b/jobs/avatars/main.go
index d2aa0c76..b4834df1 100644
--- a/jobs/avatars/main.go
+++ b/jobs/avatars/main.go
@@ -31,10 +31,10 @@ func main() {
 	avatarSources = []AvatarSource{
 		&Gravatar{
 			Rating:         "pg",
-			RequestLimiter: time.NewTicker(250 * time.Millisecond),
+			RequestLimiter: time.NewTicker(150 * time.Millisecond),
 		},
 		&MyAnimeList{
-			RequestLimiter: time.NewTicker(500 * time.Millisecond),
+			RequestLimiter: time.NewTicker(150 * time.Millisecond),
 		},
 	}