DefaultImageFormatReader.php: GdImageFormatReader isn't from gd

inc/Service/Media/DefaultImageFormatReader.php

@@ -0,0 +1,18 @@
+<?php
+namespace Vichan\Service\Media;
+
+
+class DefaultImageFormatReader implements ImageFormatReader {
+	/**
+	 * getimagesize() is agnostic of any image metadata.
+	 * If e.g. the Exif Orientation flag is set to a value which rotates the image by 90 or 270 degress, index 0 and 1
+	 * are swapped, i.e. the contain the height and width, respectively.
+	 */
+	public function getSizes(string $file_path): array {
+		$ret = \getimagesize($file_path);
+		if ($ret === false) {
+			throw new \RuntimeException("Could not read image sizes of '$file_path'");
+		}
+		return $ret;
+	}
+}