sub: pack libass bitmaps directly in sd_ass.c and osd_libass.c

Change all producer of libass images to packing the bitmaps into a
single larger bitmap directly when they're output. This is supposed to
help working towards refcounted sub bitmaps.

This will reduce performance for VOs like vo_xv, but not for vo_opengl.
vo_opengl simply will pick up the pre-packed sub bitmaps, and skip
packing them again. vo_xv will copy and pack the sub bitmaps
unnecessarily - but if we want sub bitmap refcounting, they'd have to be
copied anyway.

The packing code cannot be removed yet from vo_opengl, because there are
certain corner cases that still produce unpackad other sub bitmaps.
Actual refcounting will also require more work.

1 files changed, 3 insertions, 1 deletions

diff --git a/sub/osd_state.h b/sub/osd_state.h
index 0fff668d2d..c2e7911d1b 100644
--- a/sub/osd_state.h
+++ b/sub/osd_state.h
@@ -57,8 +57,10 @@ struct osd_object {
     struct mp_osd_res vo_res;
 
     // Internally used by osd_libass.c
-    struct sub_bitmaps parts_cache;
+    bool changed;
     struct ass_state ass;
+    struct mp_ass_packer *ass_packer;
+    struct ass_image **ass_imgs;
 };
 
 struct osd_external {