add cmdline opt --auto-rotate to rotate according to EXIF info

src/help.raw

@@ -35,6 +35,7 @@ OPTIONS
  -d, --draw-filename       Show the filename in the image window
      --draw-tinted         Show overlay texts on semi-transparent background
      --draw-exif           Show some Exif information (if compiled with exif=1)
+     --auto-rotate         Rotate images according to Exif info (if compiled with exif=1)
  -^, --title TITLE         Set window title (see FORMAT SPECIFIERS)
  -D, --slideshow-delay NUM Set delay between automatically changing slides
      --cycle-once          Exit after one loop through the slideshow

src/imlib.c

@@ -264,7 +264,7 @@ int feh_load_image(Imlib_Image * im, feh_file * file)
 	if (exifData) {
 		ExifByteOrder byteOrder = exif_data_get_byte_order(exifData);
 		ExifEntry *exifEntry = exif_data_get_entry(exifData, EXIF_TAG_ORIENTATION);
-		if (exifEntry)
+		if (exifEntry && opt.auto_rotate)
 			orientation = exif_get_short(exifEntry->data, byteOrder);
 	}
 	file->ed = exifData;

src/options.c

@@ -396,6 +396,7 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
 		{"no-jump-on-resort", 0, 0, 220},
 #ifdef HAVE_LIBEXIF
 		{"draw-exif"     , 0, 0, 223},
+		{"auto-rotate"   , 0, 0, 242},
 #endif
 		{"cycle-once"    , 0, 0, 224},
 		{"no-xinerama"   , 0, 0, 225},
@@ -730,6 +731,9 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
 		case 223:
 			opt.draw_exif = 1;
 			break;
+		case 242:
+			opt.auto_rotate = 1;
+			break;
 #endif
 		case 224:
 			opt.cycle_once = 1;

src/options.h

@@ -51,6 +51,7 @@ struct __fehoptions {
 	unsigned char draw_filename;
 #ifdef HAVE_LIBEXIF
 	unsigned char draw_exif;
+	unsigned char auto_rotate;
 #endif
 	unsigned char list;
 	unsigned char quiet;