Use Imagick to keep GIF animation

If Imagick is available, GIF will be saved using it to keep animation.
Otherwise the previous method will be used and the animation won't be kept.

2 files changed, 13 insertions, 1 deletions

diff --git a/composer.json b/composer.json
index b28404e3..b1c144c7 100644
--- a/composer.json
+++ b/composer.json
@@ -103,6 +103,9 @@
         "phpstan/phpstan-symfony": "^0.11.0",
         "phpstan/phpstan-doctrine": "^0.11.0"
     },
+    "suggest": {
+        "ext-imagick": "To keep GIF animation when downloading image is enabled"
+    },
     "scripts": {
         "post-cmd": [
             "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
diff --git a/src/Wallabag/CoreBundle/Helper/DownloadImages.php b/src/Wallabag/CoreBundle/Helper/DownloadImages.php
index cc3dcfce..bc2afc64 100644
--- a/src/Wallabag/CoreBundle/Helper/DownloadImages.php
+++ b/src/Wallabag/CoreBundle/Helper/DownloadImages.php
@@ -135,7 +135,16 @@ class DownloadImages
 
         switch ($ext) {
             case 'gif':
-                imagegif($im, $localPath);
+                // use Imagick if available to keep GIF animation
+                if (class_exists('\\Imagick')) {
+                    $imagick = new \Imagick();
+                    $imagick->readImageBlob($res->getBody());
+                    $imagick->setImageFormat('gif');
+                    $imagick->writeImages($localPath, true);
+                } else {
+                    imagegif($im, $localPath);
+                }
+
                 $this->logger->debug('DownloadImages: Re-creating gif');
                 break;
             case 'jpeg':