osd: delay libass initialization as far as possible

Until now, most OSD objects created the associated ASS_Renderer instance
as soon as possible, even if nothing was going to be rendered. Maybe
this was even intentional.

Change this for the sake of lowering resource usage, and strictly
initialize ASS_Renderer only when it's really needed.

For the OSC, initialization has to be forced, because of the insane
mechanism for translating mouse coordinates to OSD coordinates.

1 files changed, 2 insertions, 0 deletions

diff --git a/player/lua.c b/player/lua.c
index cf0c5caa41..3bf5298578 100644
--- a/player/lua.c
+++ b/player/lua.c
@@ -967,6 +967,8 @@ static int script_set_osd_ass(lua_State *L)
     int res_x = luaL_checkinteger(L, 1);
     int res_y = luaL_checkinteger(L, 2);
     const char *text = luaL_checkstring(L, 3);
+    if (!text[0])
+        text = " "; // force external OSD initialization
     osd_set_external(mpctx->osd, res_x, res_y, (char *)text);
     mp_input_wakeup(mpctx->input);
     return 0;