1 files changed, 9 insertions, 4 deletions
diff --git a/sub/dec_sub.h b/sub/dec_sub.h
index df6aaf9b91..9c75506c4c 100644
--- a/sub/dec_sub.h
+++ b/sub/dec_sub.h
@@ -4,21 +4,26 @@
 #include <stdbool.h>
 #include <stdint.h>
 
-#define MAX_OSD_PARTS 8
-
 struct sh_sub;
 struct osd_state;
 struct ass_track;
 
 enum sub_bitmap_format {
-    SUBBITMAP_EMPTY,
+    SUBBITMAP_EMPTY = 0,// no bitmaps; always has num_parts==0
     SUBBITMAP_LIBASS,   // A8, with a per-surface blend color (libass.color)
-    SUBBITMAP_RGBA,     // B8G8R8A8
+    SUBBITMAP_RGBA,     // B8G8R8A8, can be scaled
     SUBBITMAP_OLD,      // I8A8 (monochrome), premultiplied alpha
+    SUBBITMAP_OLD_PLANAR, // like previous, but bitmap points to old_osd_planar
 
     SUBBITMAP_COUNT
 };
 
+// For SUBBITMAP_OLD_PANAR
+struct old_osd_planar {
+    unsigned char *bitmap;
+    unsigned char *alpha;
+};
+
 typedef struct mp_eosd_res {
     int w, h; // screen dimensions, including black borders
     int mt, mb, ml, mr; // borders (top, bottom, left, right)