1 files changed, 58 insertions, 0 deletions
diff --git a/dom/bindings/StructuredClone.cpp b/dom/bindings/StructuredClone.cpp
new file mode 100644
index 000000000..71b4f5c74
--- /dev/null
+++ b/dom/bindings/StructuredClone.cpp
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "mozilla/dom/StructuredClone.h"
+
+#include "js/StructuredClone.h"
+#include "mozilla/dom/ImageData.h"
+#include "mozilla/dom/StructuredCloneTags.h"
+
+namespace mozilla {
+namespace dom {
+
+JSObject*
+ReadStructuredCloneImageData(JSContext* aCx, JSStructuredCloneReader* aReader)
+{
+  // Read the information out of the stream.
+  uint32_t width, height;
+  JS::Rooted<JS::Value> dataArray(aCx);
+  if (!JS_ReadUint32Pair(aReader, &width, &height) ||
+      !JS_ReadTypedArray(aReader, &dataArray)) {
+    return nullptr;
+  }
+  MOZ_ASSERT(dataArray.isObject());
+
+  // Protect the result from a moving GC in ~nsRefPtr.
+  JS::Rooted<JSObject*> result(aCx);
+  {
+    // Construct the ImageData.
+    RefPtr<ImageData> imageData = new ImageData(width, height,
+                                                  dataArray.toObject());
+    // Wrap it in a JS::Value.
+    if (!imageData->WrapObject(aCx, nullptr, &result)) {
+      return nullptr;
+    }
+  }
+  return result;
+}
+
+bool
+WriteStructuredCloneImageData(JSContext* aCx, JSStructuredCloneWriter* aWriter,
+                              ImageData* aImageData)
+{
+  uint32_t width = aImageData->Width();
+  uint32_t height = aImageData->Height();
+  JS::Rooted<JSObject*> dataArray(aCx, aImageData->GetDataObject());
+
+  JSAutoCompartment ac(aCx, dataArray);
+  JS::Rooted<JS::Value> arrayValue(aCx, JS::ObjectValue(*dataArray));
+  return JS_WriteUint32Pair(aWriter, SCTAG_DOM_IMAGEDATA, 0) &&
+         JS_WriteUint32Pair(aWriter, width, height) &&
+         JS_WriteTypedArray(aWriter, arrayValue);
+}
+
+} // namespace dom
+} // namespace mozilla