Changeset 31040 for trunk/src/wp-includes/class-wp-image-editor-gd.php

Timestamp:

01/03/2015 10:01:54 PM (10 years ago)

Author:

wonderboymusic

Message:

Preserve alpha transparency when rotating a PNG while GD is the active image editor.

Adds unit tests.

Props frankpw, voldemortensen.
Fixes #30596.

File:

• trunk/src/wp-includes/class-wp-image-editor-gd.php (modified) (1 diff)

trunk/src/wp-includes/class-wp-image-editor-gd.php

@@ -307 +307 @@
     public function rotate( $angle ) {
         if ( function_exists('imagerotate') ) {
-            $rotated = imagerotate( $this->image, $angle, 0 );
+            $transparency = imagecolorallocatealpha( $this->image, 255, 255, 255, 127 );
+            $rotated = imagerotate( $this->image, $angle, $transparency );
 
             if ( is_resource( $rotated ) ) {
+                imagealphablending( $rotated, true );
+                imagesavealpha( $rotated, true );
                 imagedestroy( $this->image );
                 $this->image = $rotated;