Preserving the Animation of Gif Images

Summary: Preserving animation of GIF profile Pictures

Test Plan: Uploaded Animated images as profile pictures to check if the animation of gif images is preserved and it does :) somewhat !

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4833

conf/default.conf.php

@@ -882,6 +882,10 @@ return array(
     'image/vnd.microsoft.icon'  => true,
   ),
 
+  //  Configuration option for enabling imagemagick
+  //  to resize animated profile pictures (gif)
+  'files.enable-imagemagick' => false,
+
 // -- Storage --------------------------------------------------------------- //
 
   // Phabricator allows users to upload files, and can keep them in various

src/__phutil_library_map__.php

@@ -1261,6 +1261,7 @@ phutil_register_library_map(array(
     'PhabricatorSetupCheckExtraConfig' => 'applications/config/check/PhabricatorSetupCheckExtraConfig.php',
     'PhabricatorSetupCheckFacebook' => 'applications/config/check/PhabricatorSetupCheckFacebook.php',
     'PhabricatorSetupCheckGD' => 'applications/config/check/PhabricatorSetupCheckGD.php',
+    'PhabricatorSetupCheckImagemagick' => 'applications/config/check/PhabricatorSetupCheckImagemagick.php',
     'PhabricatorSetupCheckInvalidConfig' => 'applications/config/check/PhabricatorSetupCheckInvalidConfig.php',
     'PhabricatorSetupCheckMail' => 'applications/config/check/PhabricatorSetupCheckMail.php',
     'PhabricatorSetupCheckMySQL' => 'applications/config/check/PhabricatorSetupCheckMySQL.php',
@@ -2677,6 +2678,7 @@ phutil_register_library_map(array(
     'PhabricatorSetupCheckExtraConfig' => 'PhabricatorSetupCheck',
     'PhabricatorSetupCheckFacebook' => 'PhabricatorSetupCheck',
     'PhabricatorSetupCheckGD' => 'PhabricatorSetupCheck',
+    'PhabricatorSetupCheckImagemagick' => 'PhabricatorSetupCheck',
     'PhabricatorSetupCheckInvalidConfig' => 'PhabricatorSetupCheck',
     'PhabricatorSetupCheckMail' => 'PhabricatorSetupCheck',
     'PhabricatorSetupCheckMySQL' => 'PhabricatorSetupCheck',

src/applications/config/check/PhabricatorSetupCheckImagemagick.php

@@ -0,0 +1,25 @@
+<?php
+
+final class PhabricatorSetupCheckImagemagick extends PhabricatorSetupCheck {
+
+  protected function executeChecks() {
+    $imagemagick = PhabricatorEnv::getEnvConfig('files.enable-imagemagick');
+    if ($imagemagick) {
+      list($err) = exec_manual('which convert');
+      if ($err) {
+        $message = pht(
+          'You have enabled Imagemagick in your config, but the \'convert\''.
+          ' binary is not in the webserver\'s $PATH. Disable imagemagick'.
+          ' or make it available to the webserver.');
+
+        $this->newIssue('files.enable-imagemagick')
+        ->setName(pht(
+          "'convert' binary not found or Imagemagick is not installed."))
+        ->setMessage($message)
+        ->addPhabricatorConfig('files.enable-imagemagick')
+        ->addPhabricatorConfig('environment.append-paths');
+      }
+    }
+  }
+}
+

src/applications/files/PhabricatorImageTransformer.php

@@ -95,8 +95,14 @@ final class PhabricatorImageTransformer {
       $scaled_y = $min_y;
     }
 
+    $cropped = $this->applyScaleWithImagemagick($file, $x, $scaled_y);
+
+    if ($cropped != null) {
+      return $cropped;
+    }
+
     $img = $this->applyScaleTo(
-      $img,
+      $file,
       $x,
       $scaled_y);
 
@@ -131,11 +137,13 @@ final class PhabricatorImageTransformer {
    * Very crudely scale an image up or down to an exact size.
    */
   private function crudelyScaleTo(PhabricatorFile $file, $dx, $dy) {
-    $data = $file->loadFileData();
-    $src = imagecreatefromstring($data);
+    $scaled = $this->applyScaleWithImagemagick($file, $dx, $dy);
 
-    $dst = $this->applyScaleTo($src, $dx, $dy);
+    if ($scaled != null) {
+      return $scaled;
+    }
 
+    $dst = $this->applyScaleTo($file, $dx, $dy);
     return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
   }
 
@@ -147,17 +155,22 @@ final class PhabricatorImageTransformer {
     return $dst;
   }
 
-  private function applyScaleTo($src, $dx, $dy) {
+  private function applyScaleTo(PhabricatorFile $file, $dx, $dy) {
+    $data = $file->loadFileData();
+    $src = imagecreatefromstring($data);
+
     $x = imagesx($src);
     $y = imagesy($src);
 
     $scale = min(($dx / $x), ($dy / $y), 1);
 
-    $dst = $this->getBlankDestinationFile($dx, $dy);
-
     $sdx = $scale * $x;
     $sdy = $scale * $y;
 
+    $dst = $this->getBlankDestinationFile($dx, $dy);
+    imagesavealpha($dst, true);
+    imagefill($dst, 0, 0, imagecolorallocatealpha($dst, 255, 255, 255, 127));
+
     imagecopyresampled(
       $dst,
       $src,
@@ -167,6 +180,7 @@ final class PhabricatorImageTransformer {
       $x, $y);
 
     return $dst;
+
   }
 
   public static function getPreviewDimensions(PhabricatorFile $file, $size) {
@@ -337,7 +351,7 @@ final class PhabricatorImageTransformer {
 
   private function saveImageDataInAnyFormat($data, $preferred_mime = '') {
     switch ($preferred_mime) {
-      case 'image/gif': // GIF doesn't support true color.
+      case 'image/gif': // Gif doesn't support true color
       case 'image/png':
         if (function_exists('imagepng')) {
           ob_start();
@@ -368,4 +382,43 @@ final class PhabricatorImageTransformer {
     return $img;
   }
 
+  private function applyScaleWithImagemagick(PhabricatorFile $file, $dx, $dy) {
+
+    $img_type = $file->getMimeType();
+    $imagemagick = PhabricatorEnv::getEnvConfig('files.enable-imagemagick');
+
+    if ($img_type != 'image/gif' || $imagemagick == false) {
+      return null;
+    }
+
+    $data = $file->loadFileData();
+    $src = imagecreatefromstring($data);
+
+    $x = imagesx($src);
+    $y = imagesy($src);
+
+    $scale = min(($dx / $x), ($dy / $y), 1);
+
+    $sdx = $scale * $x;
+    $sdy = $scale * $y;
+
+    $input = new TempFile();
+    Filesystem::writeFile($input, $data);
+
+    $resized = new TempFile();
+
+    list($err) = exec_manual(
+                 'convert %s -coalesce -resize %sX%s\! %s'
+                  , $input, $sdx, $sdy, $resized
+                  );
+
+    if (!$err) {
+      $new_data = Filesystem::readFile($resized);
+      return $new_data;
+    } else {
+      return null;
+    }
+
+  }
+
 }

src/applications/files/config/PhabricatorFilesConfigOptions.php

@@ -119,6 +119,16 @@ final class PhabricatorFilesConfigOptions
             "value and the UI will then reflect the actual configured ".
             "limit."))
         ->addExample('10M', pht("Valid setting.")),
+     $this->newOption('files.enable-imagemagick', 'bool', false)
+       ->setBoolOptions(
+         array(
+           pht('Enable'),
+           pht('Disable')
+         ))->setDescription(
+             pht("This option will enable animated gif images".
+                  "to be set as profile pictures. The \'convert\' binary ".
+                  "should be available to the webserver for this to work")),
+
     );
   }