vo: hack to avoid threading issues with mouse input

VO backends which are or will run in their own thread have a problem
with vo_mouse_movement() calling vo_control(). Restrict this to VOs
which actually need this.

video/out/vo.c

@@ -416,7 +416,8 @@ void vo_mouse_movement(struct vo *vo, int posx, int posy)
     if (!vo->opts->enable_mouse_movements)
         return;
     float p[2] = {posx, posy};
-    vo_control(vo, VOCTRL_WINDOW_TO_OSD_COORDS, p);
+    if (vo->driver->caps & VO_CAP_EVIL_OSD)
+        vo_control(vo, VOCTRL_WINDOW_TO_OSD_COORDS, p);
     mp_input_set_mouse_pos(vo->input_ctx, p[0], p[1]);
 }
 

video/out/vo.h

@@ -134,6 +134,8 @@ struct voctrl_screenshot_args {
 
 // VO does handle mp_image_params.rotate in 90 degree steps
 #define VO_CAP_ROTATE90 1
+// Requires VOCTRL_WINDOW_TO_OSD_COORDS to map mouse coords. to OSD coords.
+#define VO_CAP_EVIL_OSD 2
 
 #define VO_MAX_QUEUE 5
 

video/out/vo_wayland.c

@@ -928,6 +928,7 @@ static int control(struct vo *vo, uint32_t request, void *data)
 const struct vo_driver video_out_wayland = {
     .description = "Wayland SHM video output",
     .name = "wayland",
+    .caps = VO_CAP_EVIL_OSD,
     .priv_size = sizeof(struct priv),
     .preinit = preinit,
     .query_format = query_format,

video/out/vo_x11.c

@@ -647,6 +647,7 @@ static int control(struct vo *vo, uint32_t request, void *data)
 const struct vo_driver video_out_x11 = {
     .description = "X11 ( XImage/Shm )",
     .name = "x11",
+    .caps = VO_CAP_EVIL_OSD,
     .priv_size = sizeof(struct priv),
     .options = (const struct m_option []){{0}},
     .preinit = preinit,

video/out/vo_xv.c

@@ -866,6 +866,7 @@ static int control(struct vo *vo, uint32_t request, void *data)
 const struct vo_driver video_out_xv = {
     .description = "X11/Xv",
     .name = "xv",
+    .caps = VO_CAP_EVIL_OSD,
     .preinit = preinit,
     .query_format = query_format,
     .reconfig = reconfig,