display: make it possible to lookup the display cache by type.

Make it possible to add extra an extra filter to most of display cache
lookup functions so that the GstVaapiDisplay instance can really match
a compatible and existing display by type, instead of relying on extra
string tags (e.g. "X11:" prefix, etc.).

1 files changed, 22 insertions, 0 deletions

diff --git a/gst-libs/gst/vaapi/gstvaapidisplay_priv.h b/gst-libs/gst/vaapi/gstvaapidisplay_priv.h
index 24bf7517..0608f428 100644
--- a/gst-libs/gst/vaapi/gstvaapidisplay_priv.h
+++ b/gst-libs/gst/vaapi/gstvaapidisplay_priv.h
@@ -96,6 +96,16 @@ typedef void     (*GstVaapiDisplayGetSizeMFunc)(GstVaapiDisplay *display,
 #define GST_VAAPI_DISPLAY_UNLOCK(display) \
     gst_vaapi_display_unlock(GST_VAAPI_DISPLAY_CAST(display))
 
+/**
+ * GST_VAAPI_DISPLAY_TYPES:
+ * @display: a #GstVaapiDisplay
+ *
+ * Returns compatible @display types as a set of flags
+ */
+#undef  GST_VAAPI_DISPLAY_TYPES
+#define GST_VAAPI_DISPLAY_TYPES(display) \
+    gst_vaapi_display_get_display_types(GST_VAAPI_DISPLAY_CAST(display))
+
 struct _GstVaapiDisplayPrivate {
     GstVaapiDisplay    *parent;
     GRecMutex           mutex;
@@ -145,6 +155,9 @@ struct _GstVaapiDisplayClass {
     /*< private >*/
     GstVaapiMiniObjectClass parent_class;
 
+    /*< protected >*/
+    guint                       display_types;
+
     /*< public >*/
     GstVaapiDisplayInitFunc     init;
     GstVaapiDisplayBindFunc     bind_display;
@@ -176,6 +189,15 @@ gst_vaapi_display_new(const GstVaapiDisplayClass *klass,
 GstVaapiDisplayCache *
 gst_vaapi_display_get_cache(void);
 
+static inline guint
+gst_vaapi_display_get_display_types(GstVaapiDisplay *display)
+{
+    const GstVaapiDisplayClass * const dpy_class =
+        GST_VAAPI_DISPLAY_GET_CLASS(display);
+
+    return dpy_class->display_types;
+}
+
 /* Inline reference counting for core libgstvaapi library */
 #ifdef GST_VAAPI_CORE
 #define gst_vaapi_display_ref_internal(display) \