Reorder fields of cairo_private_t to match initialization order.

Call error_notify callback if set. (cairo_create): Initialize error_notify callback to NULL. (cairo_set_error_notify): New function to allow the user to set an error notify callback.
New cairo_set_error_notify prototye.
New test for cairo_set_error_notify.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/cairo.h b/src/cairo.h
index 0fcd85602..fe9b2e7e3 100644
--- a/src/cairo.h
+++ b/src/cairo.h
@@ -884,6 +884,20 @@ cairo_status (cairo_t *cr);
 const char *
 cairo_status_to_string (cairo_status_t status);
 
+/**
+ * cairo_error_notify_func_t
+ *
+ * #cairo_error_notify_func_t the type of function which is called
+ * when an error is detected by cairo. It is passed a closure and the
+ * #cairo_status_t value of the error.
+ */
+typedef void (*cairo_error_notify_func_t) (void *closure, cairo_status_t status);
+
+void
+cairo_set_error_notify (cairo_t			 *cr,
+			cairo_error_notify_func_t error_notify,
+			void			 *closure);
+
 /* Surface manipulation */
 
 /**