command: extend osd-overlay command with bounds reporting

This is more or less a minimal hack to make _some_ text measurement
functionality available to scripts. Since libass does not support such a
thing, this simply uses the bounding box of the rendered text.

This is far from ideal. Problems include:
- using a bitmap bounding box
- additional memory waste and/or flushing caches
- dependency on window size
- odd small deviations with different window sizes (run osd-test.lua and
  resize the window after each timer update; the bounding boxes aren't
  adjusted in an overly useful way)
- inability to query the size _after_ actual rendering

But I guess it's a start. Since I'm aware that it's crap, add a threat
to the manpage that this may be changed/removed again. For now, I'm
interested whether anyone will have use for it in its current form, as
it's an often requested feature.

1 files changed, 1 insertions, 1 deletions

diff --git a/player/lua/defaults.lua b/player/lua/defaults.lua
index 7681ca173e..395ca87e03 100644
--- a/player/lua/defaults.lua
+++ b/player/lua/defaults.lua
@@ -614,7 +614,7 @@ function overlay_mt.update(ov)
     cmd.name = "osd-overlay"
     cmd.res_x = math.floor(cmd.res_x)
     cmd.res_y = math.floor(cmd.res_y)
-    mp.command_native(cmd)
+    return mp.command_native(cmd)
 end
 
 function overlay_mt.remove(ov)