[vlc-devel] [PATCH v2 1/3] display: add a macro to set the callbacks and check type of the Open callback

[Steve Lhomme]

---
 include/vlc_vout_display.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/vlc_vout_display.h b/include/vlc_vout_display.h
index aa00003c8e0..0afe8e27dd4 100644
--- a/include/vlc_vout_display.h
+++ b/include/vlc_vout_display.h
@@ -208,6 +208,15 @@ typedef int (*vout_display_open_cb)(vout_display_t *vd,
                                     video_format_t *fmtp,
                                     vlc_video_context *context);
 
+#define func_is_display_open(f) _Generic( f, vout_display_open_cb: 1, default: 0 )
+
+#define set_callbacks_display(Activate, Deactivate) \
+    static_assert(func_is_display_open(Activate) == 1, "Not a display activate callback"); \
+    { \
+      vout_display_open_cb open__ = Activate; \
+      set_callbacks( open__, Deactivate ) \
+    }
+
 /**
  * "vout display" close callback
  *
-- 
2.17.1