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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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58
dom/bindings/StructuredClone.cpp Normal file
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/* -*- 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