Tweaked wfThumbIsStandard() to recognize handler-specific default parameters

* Now thumbnails with default lossy/lossless values will still count as "standard",
  for example. This makes use of the file media handler.

Change-Id: Ia69301dfbf85bb26a17f8eee0939d690021343ec

diff --git a/thumb.php b/thumb.php
index a5bdc5b..c5da918 100644 (file)
--- a/thumb.php
+++ b/thumb.php
@@ -429,16 +429,13 @@ function wfGenerateThumbnail( File $file, array $params, $thumbName ) {
  * of possible files with standard parameters is far less than that of all
  * possible combinations; rate-limiting for them can thus be more generious.
  *
- * @param File $img
+ * @param File $file
  * @param array $params
  * @return bool
  */
-function wfThumbIsStandard( File $img, array $params ) {
+function wfThumbIsStandard( File $file, array $params ) {
        global $wgThumbLimits, $wgImageLimits;
-       // @TODO: use polymorphism with media handler here
-       if ( array_diff( array_keys( $params ), array( 'width', 'page' ) ) ) {
-               return false; // extra parameters present
-       }
+
        if ( isset( $params['width'] ) ) {
                $widths = $wgThumbLimits;
                foreach ( $wgImageLimits as $pair ) {
@@ -448,6 +445,24 @@ function wfThumbIsStandard( File $img, array $params ) {
                        return false;
                }
        }
+
+       $handler = $file->getHandler();
+       if ( $handler ) {
+               // Standard thumbnails use a standard width and any page number
+               $normalParams = array( 'width' => $params['width'] );
+               if ( isset( $params['page'] ) ) {
+                       $normalParams['page'] = $params['page'];
+               }
+               // Append any default values to the map (e.g. "lossy", "lossless", "seek"...)
+               $handler->normaliseParams( $file, $normalParams );
+               // Check that the given values for non-page, non-width, params are just defaults
+               foreach ( $params as $key => $value ) {
+                       if ( !isset( $normalParams[$key] ) || $normalParams[$key] !== $value ) {
+                               return false;
+                       }
+               }
+       }
+
        return true;
 }