osd: cleanup: make OSDTYPE_ constants private to OSD code

No need to have them everywhere. The only exception/annoyance is
MAX_OSD_PARTS, which is now basically duplicated (and at runtime
initialization is checked with an assert()).

3 files changed, 28 insertions, 21 deletions

diff --git a/sub/osd.c b/sub/osd.c
index c05fc5a0e3..e37b6cf106 100644
--- a/sub/osd.c
+++ b/sub/osd.c
@@ -109,6 +109,8 @@ static bool osd_res_equals(struct mp_osd_res a, struct mp_osd_res b)
 
 struct osd_state *osd_create(struct mpv_global *global)
 {
+    assert(MAX_OSD_PARTS >= OSDTYPE_COUNT);
+
     struct osd_state *osd = talloc_zero(NULL, struct osd_state);
     *osd = (struct osd_state) {
         .opts = global->opts,
@@ -151,24 +153,25 @@ void osd_changed_unlocked(struct osd_state *osd, int obj)
     osd->want_redraw = true;
 }
 
-void osd_set_text(struct osd_state *osd, int obj, const char *text)
+void osd_set_text(struct osd_state *osd, const char *text)
 {
     pthread_mutex_lock(&osd->lock);
-    struct osd_object *osd_obj = osd->objs[obj];
+    struct osd_object *osd_obj = osd->objs[OSDTYPE_OSD];
     if (!text)
         text = "";
     if (strcmp(osd_obj->text, text) != 0) {
         talloc_free(osd_obj->text);
         osd_obj->text = talloc_strdup(osd_obj, text);
-        osd_changed_unlocked(osd, obj);
+        osd_changed_unlocked(osd, osd_obj->type);
     }
     pthread_mutex_unlock(&osd->lock);
 }
 
-void osd_set_sub(struct osd_state *osd, int obj, struct dec_sub *dec_sub)
+void osd_set_sub(struct osd_state *osd, int index, struct dec_sub *dec_sub)
 {
     pthread_mutex_lock(&osd->lock);
-    osd->objs[obj]->sub = dec_sub;
+    if (index >= 0 && index < 2)
+        osd->objs[OSDTYPE_SUB + index]->sub = dec_sub;
     pthread_mutex_unlock(&osd->lock);
 }
 
@@ -405,10 +408,11 @@ bool osd_query_and_reset_want_redraw(struct osd_state *osd)
     return r;
 }
 
-struct mp_osd_res osd_get_vo_res(struct osd_state *osd, int obj)
+struct mp_osd_res osd_get_vo_res(struct osd_state *osd)
 {
     pthread_mutex_lock(&osd->lock);
-    struct mp_osd_res res = osd->objs[obj]->vo_res;
+    // Any OSDTYPE is fine; but it mustn't be a subtitle one (can have lower res.)
+    struct mp_osd_res res = osd->objs[OSDTYPE_OSD]->vo_res;
     pthread_mutex_unlock(&osd->lock);
     return res;
 }
diff --git a/sub/osd.h b/sub/osd.h
index 654330f152..494b534d5e 100644
--- a/sub/osd.h
+++ b/sub/osd.h
@@ -78,17 +78,8 @@ struct mp_osd_res {
     double display_par;
 };
 
-enum mp_osdtype {
-    OSDTYPE_SUB,
-    OSDTYPE_SUB2, // IDs must be numerically successive
-
-    OSDTYPE_OSD,
-
-    OSDTYPE_EXTERNAL,
-    OSDTYPE_EXTERNAL2,
-
-    MAX_OSD_PARTS
-};
+// 0 <= sub_bitmaps.render_index < MAX_OSD_PARTS
+#define MAX_OSD_PARTS 5
 
 // Start of OSD symbols in osd_font.pfb
 #define OSD_CODEPOINTS 0xE000
@@ -149,8 +140,8 @@ void osd_free(struct osd_state *osd);
 
 bool osd_query_and_reset_want_redraw(struct osd_state *osd);
 
-void osd_set_text(struct osd_state *osd, int obj, const char *text);
-void osd_set_sub(struct osd_state *osd, int obj, struct dec_sub *dec_sub);
+void osd_set_text(struct osd_state *osd, const char *text);
+void osd_set_sub(struct osd_state *osd, int index, struct dec_sub *dec_sub);
 
 bool osd_get_render_subs_in_filter(struct osd_state *osd);
 void osd_set_render_subs_in_filter(struct osd_state *osd, bool s);
@@ -188,7 +179,7 @@ void osd_draw_on_image_p(struct osd_state *osd, struct mp_osd_res res,
 struct mp_image_params;
 struct mp_osd_res osd_res_from_image_params(const struct mp_image_params *p);
 
-struct mp_osd_res osd_get_vo_res(struct osd_state *osd, int obj);
+struct mp_osd_res osd_get_vo_res(struct osd_state *osd);
 
 void osd_rescale_bitmaps(struct sub_bitmaps *imgs, int frame_w, int frame_h,
                          struct mp_osd_res res, double compensate_par);
diff --git a/sub/osd_state.h b/sub/osd_state.h
index c52c3354cd..0fff668d2d 100644
--- a/sub/osd_state.h
+++ b/sub/osd_state.h
@@ -7,6 +7,18 @@
 
 #define OSD_CONV_CACHE_MAX 4
 
+enum mp_osdtype {
+    OSDTYPE_SUB,
+    OSDTYPE_SUB2, // IDs must be numerically successive
+
+    OSDTYPE_OSD,
+
+    OSDTYPE_EXTERNAL,
+    OSDTYPE_EXTERNAL2,
+
+    OSDTYPE_COUNT
+};
+
 struct ass_state {
     struct mp_log *log;
     struct ass_track *track;