vo_opengl: draw subtitles directly onto the video

This has a number of user-visible changes:

1. A new flag blend-subtitles (default on for opengl-hq) to control this
   behavior.

2. The OSD itself will not be color managed or affected by
   gamma controls. To get subtitle CMS/gamma, blend-subtitles must be
   used.

3. When enabled, this will make subtitles be cleanly interpolated by
   :interpolation, and also dithered etc. (just like the normal output).

Signed-off-by: wm4 <wm4@nowhere>

1 files changed, 1 insertions, 0 deletions

diff --git a/sub/osd.h b/sub/osd.h
index 704a424c4c..f67b6a5f14 100644
--- a/sub/osd.h
+++ b/sub/osd.h
@@ -180,6 +180,7 @@ void osd_set_nav_highlight(struct osd_state *osd, void *priv);
 enum mp_osd_draw_flags {
     OSD_DRAW_SUB_FILTER = (1 << 0),
     OSD_DRAW_SUB_ONLY   = (1 << 1),
+    OSD_DRAW_OSD_ONLY   = (1 << 2),
 };
 
 void osd_draw(struct osd_state *osd, struct mp_osd_res res,