Add the Edge operation and associated enums.

gegl/source/operations/enums.rs

@@ -2,6 +2,27 @@
 
 use crate::gegl_enum;
 
+gegl_enum!(
+  /// The abyss policy for various GEGL operations.
+  AbyssPolicy,
+  Black => "black",
+  Clamp => "clamp",
+  Loop => "loop",
+  None => "none",
+  White => "white",
+);
+
+gegl_enum!(
+  /// The detection algorithm for [`Edge`][super::Edge].
+  EdgeAlgorithm,
+  Differential => "differential",
+  Gradient => "gradient",
+  Laplace => "laplace",
+  PrewittCompass => "prewitt",
+  Roberts => "roberts",
+  Sobel => "sobel",
+);
+
 gegl_enum!(
   /// The shape for [`FocusBlur`][super::FocusBlur].
   FocusBlurShape,

gegl/source/operations/mod.rs

@@ -111,6 +111,20 @@ gegl_operation!(
   ),
 );
 
+gegl_operation!(
+  struct_name: Edge,
+  gegl_name: "edge",
+  append_crop: false,
+  values: (
+    /// The edge detection algorithm to use.
+    algorithm: EdgeAlgorithm, EdgeAlgorithm::Sobel,
+    /// The amount of edge detection to perform.
+    amount: f64, 2.0,
+    /// The edge detection border behavior.
+    border_behavior: AbyssPolicy, AbyssPolicy::Clamp,
+  ),
+);
+
 gegl_operation!(
   struct_name: EdgeNeon,
   gegl_name: "edge-neon",