-/**
- * Returns true if this thumbnail is one that MediaWiki generates
- * links to on file description pages and possibly parser output.
- *
- * $params is considered non-standard if they involve a non-standard
- * width or any non-default parameters aside from width and page number.
- * The number of possible files with standard parameters is far less than
- * that of all combinations; rate-limiting for them can thus be more generious.
- *
- * @param File $file
- * @param array $params
- * @return bool
- */
-function wfThumbIsStandard( File $file, array $params ) {
- global $wgThumbLimits, $wgImageLimits;
-
- $handler = $file->getHandler();
- if ( !$handler || !isset( $params['width'] ) ) {
- return false;
- }
-
- $basicParams = array();
- if ( isset( $params['page'] ) ) {
- $basicParams['page'] = $params['page'];
- }
-
- // Check if the width matches one of $wgThumbLimits
- if ( in_array( $params['width'], $wgThumbLimits ) ) {
- $normalParams = $basicParams + array( 'width' => $params['width'] );
- // Append any default values to the map (e.g. "lossy", "lossless", ...)
- $handler->normaliseParams( $file, $normalParams );
- } else {
- // If not, then check if the width matchs one of $wgImageLimits
- $match = false;
- foreach ( $wgImageLimits as $pair ) {
- $normalParams = $basicParams + array( 'width' => $pair[0], 'height' => $pair[1] );
- // Decide whether the thumbnail should be scaled on width or height.
- // Also append any default values to the map (e.g. "lossy", "lossless", ...)
- $handler->normaliseParams( $file, $normalParams );
- // Check if this standard thumbnail size maps to the given width
- if ( $normalParams['width'] == $params['width'] ) {
- $match = true;
- break;
- }
- }
- if ( !$match ) {
- return false; // not standard for description pages
- }
- }
-
- // 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;
-}
-