command: shorten long playlists on OSD

A hacky, convoluted, half-working mess that attempts to cut off overlong
playlists.

It does so by relying on the ASS formatting rule that the font size is
specified in the virtual PlayResY resolution. This means we can
(normally) easily tell how many lines fit on the screen. On the other
hand, this does not work if the text is wrapped.

This as a kludge until a Better™ solution is available.

3 files changed, 30 insertions, 5 deletions

diff --git a/sub/osd.h b/sub/osd.h
index f0ebc3b827..aef1c60b33 100644
--- a/sub/osd.h
+++ b/sub/osd.h
@@ -201,6 +201,7 @@ void osd_rescale_bitmaps(struct sub_bitmaps *imgs, int frame_w, int frame_h,
 // defined in osd_libass.c and osd_dummy.c
 void osd_set_external(struct osd_state *osd, void *id, int res_x, int res_y,
                       char *text);
+void osd_get_text_size(struct osd_state *osd, int *out_screen_h, int *out_font_h);
 void osd_get_function_sym(char *buffer, size_t buffer_size, int osd_function);
 
 #endif /* MPLAYER_SUB_H */
diff --git a/sub/osd_dummy.c b/sub/osd_dummy.c
index f7710ae2df..0e6b802cef 100644
--- a/sub/osd_dummy.c
+++ b/sub/osd_dummy.c
@@ -28,3 +28,9 @@ void osd_set_external(struct osd_state *osd, void *id, int res_x, int res_y,
                       char *text)
 {
 }
+
+void osd_get_text_size(struct osd_state *osd, int *out_screen_h, int *out_font_h)
+{
+    *out_screen_h = 0;
+    *out_font_h = 0;
+}
diff --git a/sub/osd_libass.c b/sub/osd_libass.c
index 454d0387a4..44fcf6d269 100644
--- a/sub/osd_libass.c
+++ b/sub/osd_libass.c
@@ -219,13 +219,10 @@ static ASS_Event *add_osd_ass_event_escaped(ASS_Track *track, const char *style,
     return e;
 }
 
-static void update_osd_text(struct osd_state *osd, struct osd_object *obj)
+static ASS_Style *prepare_osd_ass(struct osd_state *osd, struct osd_object *obj)
 {
     struct MPOpts *opts = osd->opts;
 
-    if (!obj->text[0])
-        return;
-
     create_ass_track(osd, obj, &obj->ass, 0, 0);
 
     struct osd_style_opts font = *opts->osd_style;
@@ -236,10 +233,31 @@ static void update_osd_text(struct osd_state *osd, struct osd_object *obj)
     if (!opts->osd_scale_by_window)
         playresy *= 720.0 / obj->vo_res.h;
 
-    mp_ass_set_style(get_style(&obj->ass, "OSD"), playresy, &font);
+    ASS_Style *style = get_style(&obj->ass, "OSD");
+    mp_ass_set_style(style, playresy, &font);
+    return style;
+}
+
+static void update_osd_text(struct osd_state *osd, struct osd_object *obj)
+{
+
+    if (!obj->text[0])
+        return;
+
+    prepare_osd_ass(osd, obj);
     add_osd_ass_event_escaped(obj->ass.track, "OSD", obj->text);
 }
 
+void osd_get_text_size(struct osd_state *osd, int *out_screen_h, int *out_font_h)
+{
+    pthread_mutex_lock(&osd->lock);
+    struct osd_object *obj = osd->objs[OSDTYPE_OSD];
+    ASS_Style *style = prepare_osd_ass(osd, obj);
+    *out_screen_h = obj->ass.track->PlayResY - style->MarginV;
+    *out_font_h = style->FontSize;
+    pthread_mutex_unlock(&osd->lock);
+}
+
 // align: -1 .. +1
 // frame: size of the containing area
 // obj: size of the object that should be positioned inside the area