Fix transparency for transparent PNGs when resizing - refs BT#7293

main/inc/lib/image.lib.php

@@ -220,7 +220,8 @@ class GDWrapper extends ImageWrapper {
         if ($handler) {
             $this->image_validated = true;
             $this->bg = $handler;
-            @imagealphablending($this->bg, true);	
+            @imagealphablending($this->bg, false);
+            @imagesavealpha($this->bg, true);	
         }           
     }
     	
@@ -259,6 +260,8 @@ class GDWrapper extends ImageWrapper {
 			$deltaw = (int)(($thumbw - $width) / 2);
 			$deltah = (int)(($thumbh - $height) / 2);
 			$dst_img = @ImageCreateTrueColor($thumbw, $thumbh);
+            		@imagealphablending($dst_img, false);
+		        @imagesavealpha($dst_img, true);	
 			if (!empty($this->color)) {
 				@imagefill($dst_img, 0, 0, $this->color);
 			}
@@ -276,6 +279,8 @@ class GDWrapper extends ImageWrapper {
 			$deltaw = 0;
 			$deltah = 0;
 			$dst_img = @ImageCreateTrueColor($width, $height);
+            		@imagealphablending($dst_img, false);
+		        @imagesavealpha($dst_img, true);	
 			$this->width = $width;
 			$this->height = $height;
 		}

main/newscorm/learnpath.class.php

@@ -9066,7 +9066,7 @@ EOD;
                         $image_moved = true;
                         $this->set_preview_image($new_file_name);
 
-                        //Resize to 32
+                        //Resize to 64px to use on course homepage
                         $temp->resize(64, 64, 0);
                         $temp->send_image($updir.'/'.$filename.'.64.'.$file_extension);
                         return true;