ecore_drm2: Add ecore_drm2_fb_status_handler_set

The old per output release handler is no longer complicated enough.  In
the near future we'll need to be able to tell an engine that its fb has
been placed on scanout via hardware plane, or removed from a hardware
plane.

It's simpler to provide that information as well as release information
through a single callback.

src/lib/ecore_drm2/Ecore_Drm2.h

@@ -37,6 +37,13 @@ typedef enum _Ecore_Drm2_Rotation
    ECORE_DRM2_ROTATION_REFLECT_Y = 32
 } Ecore_Drm2_Rotation;
 
+typedef enum _Ecore_Drm2_Fb_Status
+{
+   ECORE_DRM2_FB_STATUS_SCANOUT_ON = 1,
+   ECORE_DRM2_FB_STATUS_SCANOUT_OFF = 2,
+   ECORE_DRM2_FB_STATUS_RELEASE = 4,
+} Ecore_Drm2_Fb_Status;
+
 /* opaque structure to represent a drm device */
 typedef struct _Ecore_Drm2_Device Ecore_Drm2_Device;
 
@@ -85,6 +92,7 @@ EAPI extern int ECORE_DRM2_EVENT_OUTPUT_CHANGED;
 EAPI extern int ECORE_DRM2_EVENT_ACTIVATE;
 
 typedef void (*Ecore_Drm2_Release_Handler)(void *data, Ecore_Drm2_Fb *b);
+typedef void (*Ecore_Drm2_Fb_Status_Handler)(Ecore_Drm2_Fb *b, Ecore_Drm2_Fb_Status status, void *data);
 
 /**
  * @file
@@ -1061,6 +1069,23 @@ EAPI void ecore_drm2_plane_destination_set(Ecore_Drm2_Plane *plane, int x, int y
  */
 EAPI Eina_Bool ecore_drm2_plane_fb_set(Ecore_Drm2_Plane *plane, Ecore_Drm2_Fb *fb);
 
+/**
+ * Register a callback for buffer status updates
+ *
+ * When a flip completes ecore_drm2 may release a buffer.  Use this callback
+ * if you need to do bookkeeping or locking on buffer release.
+ *
+ * Additionally, an fb may be placed on scanout or removed from scanout by
+ * evas.  When this happens a compositor needs to ensure the buffers aren't
+ * released back to a client while they're on scanout.
+ *
+ * @param fb The fb to register the callback on
+ * @param handler The function to handle the callback
+ * @param data The user data to pass to the callback
+ * @ingroup Ecore_Drm2_Output_Group
+ * @since 1.20
+ */
+EAPI void ecore_drm2_fb_status_handler_set(Ecore_Drm2_Fb *fb, Ecore_Drm2_Fb_Status_Handler handler, void *data);
 # endif
 
 #endif

src/lib/ecore_drm2/ecore_drm2_fb.c

@@ -670,3 +670,10 @@ fail:
    free(fb);
    return NULL;
 }
+
+EAPI void
+ecore_drm2_fb_status_handler_set(Ecore_Drm2_Fb *fb, Ecore_Drm2_Fb_Status_Handler handler, void *data)
+{
+   fb->status_handler = handler;
+   fb->status_data = data;
+}

src/lib/ecore_drm2/ecore_drm2_private.h

@@ -162,6 +162,9 @@ struct _Ecore_Drm2_Fb
    void *gbm_bo;
    void *mmap;
 
+   Ecore_Drm2_Fb_Status_Handler status_handler;
+   void *status_data;
+
    Eina_Bool gbm : 1;
    Eina_Bool dmabuf : 1;
    Eina_Bool dead : 1;