FIX: proper support for pixel ratios up to 3

app/controllers/user_avatars_controller.rb

@@ -59,7 +59,7 @@ class UserAvatarsController < ApplicationController
     return render_dot if size < 8 || size > 500
 
     if !Discourse.avatar_sizes.include?(size) && Discourse.store.external?
-      closest = Discourse.avatar_sizes.to_a.min{|a,b| (size-a).abs <=> (size-b).abs}
+      closest = Discourse.avatar_sizes.to_a.min { |a,b| (size-a).abs <=> (size-b).abs }
       return redirect_to cdn_path("/user_avatar/#{params[:hostname]}/#{user.username_lower}/#{closest}/#{version}.png")
     end
 

app/jobs/regular/create_thumbnails.rb

@@ -17,14 +17,9 @@ module Jobs
       self.send("create_thumbnails_for_#{type}", upload)
     end
 
-    PIXEL_RATIOS ||= [1, 2, 3]
-
     def create_thumbnails_for_avatar(upload)
-      PIXEL_RATIOS.each do |pixel_ratio|
       Discourse.avatar_sizes.each do |size|
-          size *= pixel_ratio
-          OptimizedImage.create_for(upload, max, max, allow_animation: SiteSetting.allow_animated_avatars)
-        end
+        OptimizedImage.create_for(upload, size, size, allow_animation: SiteSetting.allow_animated_avatars)
       end
     end
 

lib/discourse.rb

@@ -78,11 +78,18 @@ module Discourse
     @anonymous_top_menu_items ||= Discourse.anonymous_filters + [:category, :categories, :top]
   end
 
+  PIXEL_RATIOS ||= [1, 2, 3]
+
   def self.avatar_sizes
-    # Don't cache until we can get a notification from site settings to expire cache
-    set = Set.new(SiteSetting.avatar_sizes.split("|").map(&:to_i))
-    # add retinas which are 2x dpi
-    set.to_a.each { |size| set << size * 2 }
+    # TODO: should cache these when we get a notification system for site settings
+    set = Set.new
+
+    SiteSetting.avatar_sizes.split("|").map(&:to_i).each do |size|
+      PIXEL_RATIOS.each do |pixel_ratio|
+        set << size * pixel_ratio
+      end
+    end
+
     set
   end