options: move most subtitle and OSD rendering options to sub structs

Remove them from the big MPOpts struct and move them to their sub
structs. In the places where their fields are used, create a private
copy of the structs, instead of accessing the semi-deprecated global
option struct instance (mpv_global.opts) directly.

This actually makes accessing these options finally thread-safe. They
weren't even if they should have for years. (Including some potential
for undefined behavior when e.g. the OSD font was changed at runtime.)

This is mostly transparent. All options get moved around, but most users
of the options just need to access a different struct (changing sd.opts
to a different type changes a lot of uses, for example).

One thing which has to be considered and could cause potential
regressions is that the new option copies must be explicitly updated.
sub_update_opts() takes care of this for example.

Another thing is that writing to the option structs manually won't work,
because the changes won't be propagated to other copies. Apparently the
only affected case is the implementation of the sub-step command, which
tries to change sub_delay. Handle this one explicitly (osd_changed()
doesn't need to be called anymore, because changing the option triggers
UPDATE_OSD, and updates the OSD as a consequence). The way the option
value is propagated is rather hacky, but for now this will do.

1 files changed, 3 insertions, 3 deletions

diff --git a/sub/sd_lavc.c b/sub/sd_lavc.c
index 81d8ccfa7d..71df4da36c 100644
--- a/sub/sd_lavc.c
+++ b/sub/sd_lavc.c
@@ -164,7 +164,7 @@ static void convert_pal(uint32_t *colors, size_t count, bool gray)
 // Initialize sub from sub->avsub.
 static void read_sub_bitmaps(struct sd *sd, struct sub *sub)
 {
-    struct MPOpts *opts = sd->opts;
+    struct mp_subtitle_opts *opts = sd->opts;
     struct sd_lavc_priv *priv = sd->priv;
     AVSubtitle *avsub = &sub->avsub;
 
@@ -288,7 +288,7 @@ static void read_sub_bitmaps(struct sd *sd, struct sub *sub)
 
 static void decode(struct sd *sd, struct demux_packet *packet)
 {
-    struct MPOpts *opts = sd->opts;
+    struct mp_subtitle_opts *opts = sd->opts;
     struct sd_lavc_priv *priv = sd->priv;
     AVCodecContext *ctx = priv->avctx;
     double pts = packet->pts;
@@ -387,7 +387,7 @@ static void get_bitmaps(struct sd *sd, struct mp_osd_res d, int format,
                         double pts, struct sub_bitmaps *res)
 {
     struct sd_lavc_priv *priv = sd->priv;
-    struct MPOpts *opts = sd->opts;
+    struct mp_subtitle_opts *opts = sd->opts;
 
     priv->current_pts = pts;