Add e_buffer files.

Signed-off-by: Chris Michael <devilhorns@comcast.net>

src/bin/e_wayland/e_buffer.c

@@ -0,0 +1,55 @@
+#include "e.h"
+
+/* local function prototypes */
+static void _e_buffer_cb_destroy(struct wl_listener *listener, void *data);
+
+EAPI void 
+e_buffer_reference(E_Buffer_Reference *br, struct wl_buffer *buffer)
+{
+   /* check for valid buffer reference */
+   if (!br) return;
+
+   /* check if the new buffer is difference than the one we already have 
+    * referenced */
+   if ((br->buffer) && (br->buffer != buffer))
+     {
+        br->buffer->busy_count--;
+        if (br->buffer->busy_count == 0)
+          {
+             /* queue a release event */
+             wl_resource_queue_event(&br->buffer->resource, 
+                                     WL_BUFFER_RELEASE);
+          }
+
+        /* remove any existing destroy listener */
+        wl_list_remove(&br->buffer_destroy.link);
+     }
+
+   /* if we have a valid buffer, reference it */
+   if ((buffer) && (br->buffer != buffer))
+     {
+        buffer->busy_count++;
+
+        /* setup destroy listener */
+        wl_signal_add(&buffer->resource.destroy_signal, &br->buffer_destroy);
+     }
+
+   br->buffer = buffer;
+   br->buffer_destroy.notify = _e_buffer_cb_destroy;
+}
+
+/* local functions */
+static void 
+_e_buffer_cb_destroy(struct wl_listener *listener, void *data)
+{
+   E_Buffer_Reference *br;
+
+   /* try to get the buffer_reference structure from the listener */
+   if (!(br = container_of(listener, E_Buffer_Reference, buffer_destroy)))
+     return;
+
+   /* if this buffer is not equal to the one referenced, then get out */
+   if ((struct wl_buffer *)data != br->buffer) return;
+
+   br->buffer = NULL;
+}

src/bin/e_wayland/e_buffer.h

@@ -0,0 +1,18 @@
+#ifdef E_TYPEDEFS
+
+typedef struct _E_Buffer_Reference E_Buffer_Reference;
+
+#else
+# ifndef E_BUFFER_H
+#  define E_BUFFER_H
+
+struct _E_Buffer_Reference
+{
+   struct wl_buffer *buffer;
+   struct wl_listener buffer_destroy;
+};
+
+EAPI void e_buffer_reference(E_Buffer_Reference *br, struct wl_buffer *buffer);
+
+# endif
+#endif