2 files changed, 3 insertions, 0 deletions

diff --git a/src/fb.c b/src/fb.c
index a20fdd3..c37cc04 100644
--- a/src/fb.c
+++ b/src/fb.c
@@ -328,6 +328,7 @@ int fb_fragment_slice_single(const fb_fragment_t *fragment, unsigned n_fragments
 	res_fragment->frame_height = fragment->frame_height;
 	res_fragment->stride = fragment->stride;
 	res_fragment->pitch = fragment->pitch;
+	res_fragment->number = num;
 
 	return 1;
 }
@@ -362,6 +363,7 @@ int fb_fragment_tile_single(const fb_fragment_t *fragment, unsigned tile_size, u
 	res_fragment->frame_height = fragment->frame_height;
 	res_fragment->stride = fragment->stride + ((fragment->width - res_fragment->width) * 4);
 	res_fragment->pitch = fragment->pitch;
+	res_fragment->number = num;
 
 	return 1;
 }
diff --git a/src/fb.h b/src/fb.h
index dfd4550..300c134 100644
--- a/src/fb.h
+++ b/src/fb.h
@@ -18,6 +18,7 @@ typedef struct fb_fragment_t {
 	unsigned	frame_height;	/* height of the frame this fragment is part of */
 	unsigned	stride;		/* number of bytes from the end of one row to the start of the next */
 	unsigned	pitch;		/* number of bytes separating y from y + 1, including any padding */
+	unsigned	number;		/* this fragment's number as produced by fragmenting */
 } fb_fragment_t;
 
 /* This is a page handle object for page flip submission/life-cycle.