+
+ /**
+ * Get the width and height to display image at.
+ *
+ * @note This method assumes that it is only called if one
+ * of the dimensions are bigger than the max, or if the
+ * image is vectorized.
+ *
+ * @param $maxWidth integer Max width to display at
+ * @param $maxHeight integer Max height to display at
+ * @param $width integer Actual width of the image
+ * @param $height integer Actual height of the image
+ * @throws MWException
+ * @return Array (width, height)
+ */
+ protected function getDisplayWidthHeight( $maxWidth, $maxHeight, $width, $height ) {
+ if ( !$maxWidth || !$maxHeight ) {
+ // should never happen
+ throw new MWException( 'Using a choice from $wgImageLimits that is 0x0' );
+ }
+
+ if ( !$width || !$height ) {
+ return array( 0, 0 );
+ }
+
+ # Calculate the thumbnail size.
+ if ( $width <= $maxWidth && $height <= $maxHeight ) {
+ // Vectorized image, do nothing.
+ } elseif ( $width / $height >= $maxWidth / $maxHeight ) {
+ # The limiting factor is the width, not the height.
+ $height = round( $height * $maxWidth / $width );
+ $width = $maxWidth;
+ # Note that $height <= $maxHeight now.
+ } else {
+ $newwidth = floor( $width * $maxHeight / $height );
+ $height = round( $height * $newwidth / $width );
+ $width = $newwidth;
+ # Note that $height <= $maxHeight now, but might not be identical
+ # because of rounding.
+ }
+ return array( $width, $height );
+ }
+
+ /**
+ * Get alternative thumbnail sizes.
+ *
+ * @note This will only list several alternatives if thumbnails are rendered on 404
+ * @param $origWidth Actual width of image
+ * @param $origHeight Actual height of image
+ * @return Array An array of [width, height] pairs.
+ */
+ protected function getThumbSizes( $origWidth, $origHeight ) {
+ global $wgImageLimits;
+ if ( $this->displayImg->getRepo()->canTransformVia404() ) {
+ $thumbSizes = $wgImageLimits;
+ // Also include the full sized resolution in the list, so
+ // that users know they can get it. This will link to the
+ // original file asset if mustRender() === false. In the case
+ // that we mustRender, some users have indicated that they would
+ // find it useful to have the full size image in the rendered
+ // image format.
+ $thumbSizes[] = array( $origWidth, $origHeight );
+ } else {
+ # Creating thumb links triggers thumbnail generation.
+ # Just generate the thumb for the current users prefs.
+ $thumbSizes = array( $this->getImageLimitsFromOption( $this->getContext()->getUser(), 'thumbsize' ) );
+ if ( !$this->displayImg->mustRender() ) {
+ // We can safely include a link to the "full-size" preview,
+ // without actually rendering.
+ $thumbSizes[] = array( $origWidth, $origHeight );
+ }
+ }
+ return $thumbSizes;
+ }
+