player: add --force-render option

mpv has an internal optimization on a couple of platforms where it will
not render any frames if the window is minimized or hidden. There's at
least once possible use case for wanting to force a render anyway
(screensharing with pipeware) so let's just add a simple switch for
this that always forces mpv to render. Closes #10846.

2 files changed, 3 insertions, 2 deletions

diff --git a/video/out/wayland_common.c b/video/out/wayland_common.c
index 18d9bba450..53854c2465 100644
--- a/video/out/wayland_common.c
+++ b/video/out/wayland_common.c
@@ -1754,7 +1754,7 @@ int vo_wayland_allocate_memfd(struct vo *vo, size_t size)
 bool vo_wayland_check_visible(struct vo *vo)
 {
     struct vo_wayland_state *wl = vo->wl;
-    bool render = !wl->hidden || wl->opts->disable_vsync;
+    bool render = !wl->hidden || wl->vo_opts->force_render;
     wl->frame_wait = true;
     return render;
 }
diff --git a/video/out/x11_common.c b/video/out/x11_common.c
index 2ca2ea6574..5dc844da4d 100644
--- a/video/out/x11_common.c
+++ b/video/out/x11_common.c
@@ -1972,7 +1972,8 @@ bool vo_x11_check_visible(struct vo *vo) {
     struct vo_x11_state *x11 = vo->x11;
     struct mp_vo_opts *opts = x11->opts;
 
-    bool render = !x11->hidden || VS_IS_DISP(opts->video_sync);
+    bool render = !x11->hidden || opts->force_render ||
+                  VS_IS_DISP(opts->video_sync);
     return render;
 }