+ /* formats supported by custom loaders */
+ filter_add_if_missing("dds", "DirectDraw Surface", ".dds", FORMAT_CLASS_IMAGE, FALSE, FALSE, TRUE);
+#ifdef HAVE_PDF
+ filter_add_if_missing("pdf", "Portable Document Format", ".pdf", FORMAT_CLASS_DOCUMENT, FALSE, FALSE, TRUE);
+#endif
+#ifdef HAVE_HEIF
+ filter_add_if_missing("heif/avif", "HEIF/AVIF Image", ".heif;.heic;.avif", FORMAT_CLASS_IMAGE, FALSE, TRUE, TRUE);
+#endif
+#ifdef HAVE_WEBP
+ filter_add_if_missing("webp", "WebP Format", ".webp", FORMAT_CLASS_IMAGE, TRUE, FALSE, TRUE);
+#endif
+#ifdef HAVE_DJVU
+ filter_add_if_missing("djvu", "DjVu Format", ".djvu;.djv", FORMAT_CLASS_DOCUMENT, FALSE, FALSE, TRUE);
+#endif
+#ifdef HAVE_J2K
+ filter_add_if_missing("jp2", "JPEG 2000", ".jp2", FORMAT_CLASS_IMAGE, FALSE, FALSE, TRUE);
+#endif
+#ifdef HAVE_ARCHIVE
+ filter_add_if_missing("zip", "Archive files", ".zip;.rar;.tar;.tar.gz;.tar.bz2;.tar.xz;.tgz;.tbz;.txz;.cbr;.cbz;.gz;.bz2;.xz;.lzh;.lza;.7z", FORMAT_CLASS_ARCHIVE, FALSE, FALSE, TRUE);
+#endif
+ filter_add_if_missing("scr", "ZX Spectrum screen Format", ".scr", FORMAT_CLASS_IMAGE, FALSE, FALSE, TRUE);
+ filter_add_if_missing("psd", "Adobe Photoshop Document", ".psd", FORMAT_CLASS_IMAGE, FALSE, FALSE, TRUE);
+ filter_add_if_missing("apng", "Animated Portable Network Graphic", ".apng", FORMAT_CLASS_IMAGE, FALSE, FALSE, TRUE);
+
+ /* formats supported by gdk-pixbuf */