1 files changed, 59 insertions, 0 deletions
diff --git a/servo/components/style/gecko/conversions.rs b/servo/components/style/gecko/conversions.rs
new file mode 100644
index 0000000000..ea3700a323
--- /dev/null
+++ b/servo/components/style/gecko/conversions.rs
@@ -0,0 +1,59 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! This module contains conversion helpers between Servo and Gecko types
+//! Ideally, it would be in geckolib itself, but coherence
+//! forces us to keep the traits and implementations here
+//!
+//! FIXME(emilio): This file should generally just die.
+
+#![allow(unsafe_code)]
+
+use crate::gecko_bindings::structs::{nsresult, Matrix4x4Components};
+use crate::stylesheets::RulesMutateError;
+use crate::values::computed::transform::Matrix3D;
+
+impl From<RulesMutateError> for nsresult {
+    fn from(other: RulesMutateError) -> Self {
+        match other {
+            RulesMutateError::Syntax => nsresult::NS_ERROR_DOM_SYNTAX_ERR,
+            RulesMutateError::IndexSize => nsresult::NS_ERROR_DOM_INDEX_SIZE_ERR,
+            RulesMutateError::HierarchyRequest => nsresult::NS_ERROR_DOM_HIERARCHY_REQUEST_ERR,
+            RulesMutateError::InvalidState => nsresult::NS_ERROR_DOM_INVALID_STATE_ERR,
+        }
+    }
+}
+
+impl<'a> From<&'a Matrix4x4Components> for Matrix3D {
+    fn from(m: &'a Matrix4x4Components) -> Matrix3D {
+        Matrix3D {
+            m11: m[0],
+            m12: m[1],
+            m13: m[2],
+            m14: m[3],
+            m21: m[4],
+            m22: m[5],
+            m23: m[6],
+            m24: m[7],
+            m31: m[8],
+            m32: m[9],
+            m33: m[10],
+            m34: m[11],
+            m41: m[12],
+            m42: m[13],
+            m43: m[14],
+            m44: m[15],
+        }
+    }
+}
+
+impl From<Matrix3D> for Matrix4x4Components {
+    fn from(matrix: Matrix3D) -> Self {
+        [
+            matrix.m11, matrix.m12, matrix.m13, matrix.m14, matrix.m21, matrix.m22, matrix.m23,
+            matrix.m24, matrix.m31, matrix.m32, matrix.m33, matrix.m34, matrix.m41, matrix.m42,
+            matrix.m43, matrix.m44,
+        ]
+    }
+}