vo: simplify VOs by adding generic screenshot support

At the time screenshot support was added, images weren't refcounted yet,
so screenshots required specialized implementations in the VOs. But now
we can handle these things much simpler. Also see commit 5bb24980.

If there are VOs in the future which can't do this (e.g. they need to
write to the image passed to vo_driver->draw_image), this still could be
disabled on a per-VO basis etc., so we lose no potential performance
advantages.

1 files changed, 2 insertions, 3 deletions

diff --git a/video/out/vo.h b/video/out/vo.h
index 9ae489e2cd..e5eccd3f86 100644
--- a/video/out/vo.h
+++ b/video/out/vo.h
@@ -97,9 +97,7 @@ enum mp_voctrl {
     // imgfmt/w/h/d_w/d_h can be omitted for convenience.
     VOCTRL_GET_COLORSPACE,              // struct mp_image_params*
 
-    // Retrieve original image.
-    VOCTRL_SCREENSHOT,                  // struct mp_image**
-    // Retrieve window contents.
+    // Retrieve window contents. (Normal screenshots use vo_get_current_frame().)
     VOCTRL_SCREENSHOT_WIN,              // struct mp_image**
 
     VOCTRL_SET_COMMAND_LINE,            // char**
@@ -319,6 +317,7 @@ void vo_increment_drop_count(struct vo *vo, int64_t n);
 void vo_query_formats(struct vo *vo, uint8_t *list);
 void vo_event(struct vo *vo, int event);
 int vo_query_and_reset_events(struct vo *vo, int events);
+struct mp_image *vo_get_current_frame(struct vo *vo);
 
 void vo_set_flip_queue_params(struct vo *vo, int64_t offset_us, bool vsync_timed);
 int64_t vo_get_vsync_interval(struct vo *vo);