Move geckolib/properties.mako.rs to style/properties/gecko.mako.rs

components/style/gecko_glue.rs

@@ -0,0 +1,57 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+#![allow(unsafe_code)]
+
+use std::marker::PhantomData;
+use std::mem::{forget, transmute};
+use std::sync::Arc;
+
+pub struct ArcHelpers<GeckoType, ServoType> {
+    phantom1: PhantomData<GeckoType>,
+    phantom2: PhantomData<ServoType>,
+}
+
+
+impl<GeckoType, ServoType> ArcHelpers<GeckoType, ServoType> {
+    pub fn with<F, Output>(raw: *mut GeckoType, cb: F) -> Output
+                           where F: FnOnce(&Arc<ServoType>) -> Output {
+        debug_assert!(!raw.is_null());
+
+        let owned = unsafe { Self::into(raw) };
+        let result = cb(&owned);
+        forget(owned);
+        result
+    }
+
+    pub fn maybe_with<F, Output>(maybe_raw: *mut GeckoType, cb: F) -> Output
+                                 where F: FnOnce(Option<&Arc<ServoType>>) -> Output {
+        let owned = if maybe_raw.is_null() {
+            None
+        } else {
+            Some(unsafe { Self::into(maybe_raw) })
+        };
+
+        let result = cb(owned.as_ref());
+        forget(owned);
+
+        result
+    }
+
+    pub unsafe fn into(ptr: *mut GeckoType) -> Arc<ServoType> {
+        transmute(ptr)
+    }
+
+    pub fn from(owned: Arc<ServoType>) -> *mut GeckoType {
+        unsafe { transmute(owned) }
+    }
+
+    pub unsafe fn addref(ptr: *mut GeckoType) {
+        Self::with(ptr, |arc| forget(arc.clone()));
+    }
+
+    pub unsafe fn release(ptr: *mut GeckoType) {
+        let _ = Self::into(ptr);
+    }
+}