Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #include "mozilla/dom/StructuredClone.h"
       8             : 
       9             : #include "js/StructuredClone.h"
      10             : #include "mozilla/dom/ImageData.h"
      11             : #include "mozilla/dom/StructuredCloneTags.h"
      12             : 
      13             : namespace mozilla {
      14             : namespace dom {
      15             : 
      16             : JSObject*
      17           0 : ReadStructuredCloneImageData(JSContext* aCx, JSStructuredCloneReader* aReader)
      18             : {
      19             :   // Read the information out of the stream.
      20             :   uint32_t width, height;
      21           0 :   JS::Rooted<JS::Value> dataArray(aCx);
      22           0 :   if (!JS_ReadUint32Pair(aReader, &width, &height) ||
      23           0 :       !JS_ReadTypedArray(aReader, &dataArray)) {
      24           0 :     return nullptr;
      25             :   }
      26           0 :   MOZ_ASSERT(dataArray.isObject());
      27             : 
      28             :   // Protect the result from a moving GC in ~nsRefPtr.
      29           0 :   JS::Rooted<JSObject*> result(aCx);
      30             :   {
      31             :     // Construct the ImageData.
      32             :     RefPtr<ImageData> imageData = new ImageData(width, height,
      33           0 :                                                   dataArray.toObject());
      34             :     // Wrap it in a JS::Value.
      35           0 :     if (!imageData->WrapObject(aCx, nullptr, &result)) {
      36           0 :       return nullptr;
      37             :     }
      38             :   }
      39           0 :   return result;
      40             : }
      41             : 
      42             : bool
      43           0 : WriteStructuredCloneImageData(JSContext* aCx, JSStructuredCloneWriter* aWriter,
      44             :                               ImageData* aImageData)
      45             : {
      46           0 :   uint32_t width = aImageData->Width();
      47           0 :   uint32_t height = aImageData->Height();
      48           0 :   JS::Rooted<JSObject*> dataArray(aCx, aImageData->GetDataObject());
      49             : 
      50           0 :   JSAutoCompartment ac(aCx, dataArray);
      51           0 :   JS::Rooted<JS::Value> arrayValue(aCx, JS::ObjectValue(*dataArray));
      52           0 :   return JS_WriteUint32Pair(aWriter, SCTAG_DOM_IMAGEDATA, 0) &&
      53           0 :          JS_WriteUint32Pair(aWriter, width, height) &&
      54           0 :          JS_WriteTypedArray(aWriter, arrayValue);
      55             : }
      56             : 
      57             : } // namespace dom
      58             : } // namespace mozilla