зеркало из https://github.com/mozilla/gecko-dev.git
140 строки
4.3 KiB
C++
140 строки
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 et tw=78: */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/ImageData.h"
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#include "mozilla/CheckedInt.h"
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#include "mozilla/HoldDropJSObjects.h"
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#include "mozilla/dom/ImageDataBinding.h"
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#include "jsapi.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_CYCLE_COLLECTING_ADDREF(ImageData)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(ImageData)
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NS_IMPL_CYCLE_COLLECTION_CLASS(ImageData)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ImageData)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ImageData)
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mData)
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ImageData)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ImageData)
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tmp->DropData();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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// static
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already_AddRefed<ImageData> ImageData::Constructor(const GlobalObject& aGlobal,
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const uint32_t aWidth,
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const uint32_t aHeight,
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ErrorResult& aRv) {
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if (aWidth == 0 || aHeight == 0) {
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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CheckedInt<uint32_t> length = CheckedInt<uint32_t>(aWidth) * aHeight * 4;
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if (!length.isValid()) {
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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js::AssertSameCompartment(aGlobal.Context(), aGlobal.Get());
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JSObject* data = Uint8ClampedArray::Create(aGlobal.Context(), length.value());
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if (!data) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return nullptr;
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}
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RefPtr<ImageData> imageData = new ImageData(aWidth, aHeight, *data);
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return imageData.forget();
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}
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// static
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already_AddRefed<ImageData> ImageData::Constructor(
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const GlobalObject& aGlobal, const Uint8ClampedArray& aData,
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const uint32_t aWidth, const Optional<uint32_t>& aHeight,
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ErrorResult& aRv) {
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aData.ComputeLengthAndData();
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uint32_t length = aData.Length();
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if (length == 0 || length % 4) {
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aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
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return nullptr;
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}
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length /= 4;
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if (aWidth == 0) {
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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uint32_t height = length / aWidth;
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if (length != aWidth * height ||
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(aHeight.WasPassed() && aHeight.Value() != height)) {
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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if (JS_GetTypedArraySharedness(aData.Obj())) {
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// Throw if the object is mapping shared memory (must opt in).
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aRv.ThrowTypeError<MSG_TYPEDARRAY_IS_SHARED>(
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NS_LITERAL_STRING("Argument of ImageData constructor"));
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return nullptr;
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}
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RefPtr<ImageData> imageData = new ImageData(aWidth, height, *aData.Obj());
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return imageData.forget();
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}
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void ImageData::HoldData() { mozilla::HoldJSObjects(this); }
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void ImageData::DropData() {
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if (mData) {
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mData = nullptr;
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mozilla::DropJSObjects(this);
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}
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}
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bool ImageData::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
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JS::MutableHandle<JSObject*> aReflector) {
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return ImageData_Binding::Wrap(aCx, this, aGivenProto, aReflector);
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}
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// static
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already_AddRefed<ImageData> ImageData::ReadStructuredClone(
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JSContext* aCx, nsIGlobalObject* aGlobal,
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JSStructuredCloneReader* aReader) {
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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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RefPtr<ImageData> imageData =
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new ImageData(width, height, dataArray.toObject());
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return imageData.forget();
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}
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bool ImageData::WriteStructuredClone(JSContext* aCx,
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JSStructuredCloneWriter* aWriter) const {
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JS::Rooted<JS::Value> arrayValue(aCx, JS::ObjectValue(*GetDataObject()));
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if (!JS_WrapValue(aCx, &arrayValue)) {
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return false;
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}
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return 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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