options: only apply sub-visibility to primary subs

Previously, the sub-visibility option changed the visibility of all
subtitles including secondary ones. This meant that it was not possible
to only display secondary subtitles while hiding the primary ones. This
modifies the sub-visibility option so that it only affects primary
subtitles which allows only secondary subtitles to be displayed.

DOCS/interface-changes.rst

@@ -39,6 +39,7 @@ Interface changes
     - add `--tone-mapping-mode`, replacing `--tone-mapping-desaturate` and
       `--tone-mapping-desaturate-exponent`.
     - add `dolbyvision` sub-parameter to `format` video filter
+    - `--sub-visibility` no longer has any effect on secondary subtitles
  --- mpv 0.34.0 ---
     - deprecate selecting by card number with `--drm-connector`, add
       `--drm-device` which can be used instead

DOCS/man/options.rst

@@ -2615,11 +2615,6 @@ Subtitles
     Can be used to disable display of secondary subtitles, but still select and
     decode them.
 
-    .. note::
-
-        If ``--sub-visibility=no``, secondary subtitles are hidden regardless of
-        ``--secondary-sub-visibility``.
-
 ``--sub-clear-on-seek``
     (Obscure, rarely useful.) Can be used to play broken mkv files with
     duplicate ReadOrder fields. ReadOrder is the first field in a

sub/dec_sub.c

@@ -334,8 +334,6 @@ struct sub_bitmaps *sub_get_bitmaps(struct dec_sub *sub, struct mp_osd_res dim,
 {
     pthread_mutex_lock(&sub->lock);
 
-    struct mp_subtitle_opts *opts = sub->opts;
-
     pts = pts_to_subtitle(sub, pts);
 
     sub->last_vo_pts = pts;
@@ -344,7 +342,7 @@ struct sub_bitmaps *sub_get_bitmaps(struct dec_sub *sub, struct mp_osd_res dim,
     struct sub_bitmaps *res = NULL;
 
     if (!(sub->end != MP_NOPTS_VALUE && pts >= sub->end) &&
-        opts->sub_visibility && sub->sd->driver->get_bitmaps)
+        sub->sd->driver->get_bitmaps)
         res = sub->sd->driver->get_bitmaps(sub->sd, dim, format, pts);
 
     pthread_mutex_unlock(&sub->lock);
@@ -453,6 +451,11 @@ void sub_set_play_dir(struct dec_sub *sub, int dir)
     pthread_mutex_unlock(&sub->lock);
 }
 
+bool sub_is_primary_visible(struct dec_sub *sub)
+{
+    return !!sub->opts->sub_visibility;
+}
+
 bool sub_is_secondary_visible(struct dec_sub *sub)
 {
     return !!sub->opts->sec_sub_visibility;

sub/dec_sub.h

@@ -51,6 +51,7 @@ void sub_reset(struct dec_sub *sub);
 void sub_select(struct dec_sub *sub, bool selected);
 void sub_set_recorder_sink(struct dec_sub *sub, struct mp_recorder_sink *sink);
 void sub_set_play_dir(struct dec_sub *sub, int dir);
+bool sub_is_primary_visible(struct dec_sub *sub);
 bool sub_is_secondary_visible(struct dec_sub *sub);
 
 int sub_control(struct dec_sub *sub, enum sd_ctrl cmd, void *arg);

sub/osd.c

@@ -291,7 +291,7 @@ static struct sub_bitmaps *render_object(struct osd_state *osd,
     check_obj_resize(osd, osdres, obj);
 
     if (obj->type == OSDTYPE_SUB) {
-        if (obj->sub)
+        if (obj->sub && sub_is_primary_visible(obj->sub))
             res = sub_get_bitmaps(obj->sub, obj->vo_res, format, video_pts);
     } else if (obj->type == OSDTYPE_SUB2) {
         if (obj->sub && sub_is_secondary_visible(obj->sub))