58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/StructuredClone.h"
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#include "js/StructuredClone.h"
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#include "mozilla/dom/ImageData.h"
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#include "mozilla/dom/StructuredCloneTags.h"
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namespace mozilla {
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namespace dom {
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JSObject*
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ReadStructuredCloneImageData(JSContext* aCx, JSStructuredCloneReader* aReader)
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{
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// Read the information out of the stream.
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uint32_t width, height;
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JS::Rooted<JS::Value> dataArray(aCx);
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if (!JS_ReadUint32Pair(aReader, &width, &height) ||
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!JS_ReadTypedArray(aReader, &dataArray)) {
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return nullptr;
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}
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MOZ_ASSERT(dataArray.isObject());
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// Protect the result from a moving GC in ~nsRefPtr.
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JS::Rooted<JSObject*> result(aCx);
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{
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// Construct the ImageData.
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RefPtr<ImageData> imageData = new ImageData(width, height,
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dataArray.toObject());
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// Wrap it in a JS::Value.
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if (!imageData->WrapObject(aCx, nullptr, &result)) {
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return nullptr;
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}
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}
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return result;
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}
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bool
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WriteStructuredCloneImageData(JSContext* aCx, JSStructuredCloneWriter* aWriter,
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ImageData* aImageData)
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{
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uint32_t width = aImageData->Width();
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uint32_t height = aImageData->Height();
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JS::Rooted<JSObject*> dataArray(aCx, aImageData->GetDataObject());
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JSAutoCompartment ac(aCx, dataArray);
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JS::Rooted<JS::Value> arrayValue(aCx, JS::ObjectValue(*dataArray));
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return JS_WriteUint32Pair(aWriter, SCTAG_DOM_IMAGEDATA, 0) &&
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JS_WriteUint32Pair(aWriter, width, height) &&
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JS_WriteTypedArray(aWriter, arrayValue);
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}
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} // namespace dom
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} // namespace mozilla
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