From ff2e267ea9d0b0bd68589da611d5c53b4be29e80 Mon Sep 17 00:00:00 2001
From: Eric Sanchez <esanchez@imgix.com>
Date: Fri, 8 May 2020 11:42:02 -0700
Subject: [PATCH] refactor: normalize behavior of target widths

---
 src/Imgix/UrlBuilder.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Imgix/UrlBuilder.php b/src/Imgix/UrlBuilder.php
index 891b196..eea9547 100644
--- a/src/Imgix/UrlBuilder.php
+++ b/src/Imgix/UrlBuilder.php
@@ -109,12 +109,17 @@ public function createSrcSet($path, $params=array(), $start=100, $stop=8192, $to
      * @return int[] $resolutions An array of even integer values.
      */
     public function targetWidths($start=100, $stop=8192, $tol=8) {
-        $resolutions = array();
 
         $ensureEven = function($n) {
             return intval(2 * round($n / 2.0));
         };
 
+        if ($start == $stop) {
+            return array($ensureEven($start));
+        }
+
+        $resolutions = array();
+
         while ($start < $stop && $start < 8192) {
             array_push($resolutions, $ensureEven($start));
             $start *= 1 + ($tol / 100.0) * 2;