From f459225c6d223317f05d4b4a01a6165b0c206b9a Mon Sep 17 00:00:00 2001
From: Leo Feyer <github@contao.org>
Date: Wed, 16 Nov 2016 16:32:32 +0100
Subject: [PATCH] Only use getimagesize() for GIFs, JPGs and PNGs.

---
 src/Image.php | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/Image.php b/src/Image.php
index 268cf8b..9656c14 100644
--- a/src/Image.php
+++ b/src/Image.php
@@ -111,16 +111,24 @@ public function getUrl($rootDir, $prefix = '')
      */
     public function getDimensions()
     {
+        // Try native getimagesize() for better performance
         if (null === $this->dimensions) {
-            $size = @getimagesize($this->getPath()); // try native getimagesize() for better performance
+            $ext = pathinfo($this->getPath(), PATHINFO_EXTENSION);
 
-            if (!empty($size[0]) && !empty($size[1])) {
-                $this->dimensions = new ImageDimensions(new Box($size[0], $size[1]));
-            } else {
-                $this->dimensions = new ImageDimensions($this->imagine->open($this->getPath())->getSize());
+            if (in_array($ext, ['gif', 'jpg', 'jpeg', 'png'])) {
+                $size = @getimagesize($this->getPath());
+
+                if (!empty($size[0]) && !empty($size[1])) {
+                    $this->dimensions = new ImageDimensions(new Box($size[0], $size[1]));
+                }
             }
         }
 
+        // Fall back to Imagine
+        if (null === $this->dimensions) {
+            $this->dimensions = new ImageDimensions($this->imagine->open($this->getPath())->getSize());
+        }
+
         return $this->dimensions;
     }