michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 et tw=78: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "mozilla/dom/ImageData.h"
michael@0: 
michael@0: #include "mozilla/CheckedInt.h"
michael@0: #include "mozilla/HoldDropJSObjects.h"
michael@0: #include "mozilla/dom/ImageDataBinding.h"
michael@0: 
michael@0: #include "jsapi.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTING_ADDREF(ImageData)
michael@0: NS_IMPL_CYCLE_COLLECTING_RELEASE(ImageData)
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_CLASS(ImageData)
michael@0: 
michael@0: NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ImageData)
michael@0:   NS_INTERFACE_MAP_ENTRY(nsISupports)
michael@0: NS_INTERFACE_MAP_END
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ImageData)
michael@0:   NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mData)
michael@0: NS_IMPL_CYCLE_COLLECTION_TRACE_END
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ImageData)
michael@0:   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
michael@0: NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ImageData)
michael@0:   tmp->DropData();
michael@0: NS_IMPL_CYCLE_COLLECTION_UNLINK_END
michael@0: 
michael@0: //static
michael@0: ImageData*
michael@0: ImageData::Constructor(const GlobalObject& aGlobal,
michael@0:                        const uint32_t aWidth,
michael@0:                        const uint32_t aHeight,
michael@0:                        ErrorResult& aRv)
michael@0: {
michael@0:   if (aWidth == 0 || aHeight == 0) {
michael@0:     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
michael@0:     return nullptr;
michael@0:   }
michael@0:   CheckedInt<uint32_t> length = CheckedInt<uint32_t>(aWidth) * aHeight * 4;
michael@0:   if (!length.isValid()) {
michael@0:     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
michael@0:     return nullptr;
michael@0:   }
michael@0:   js::AssertSameCompartment(aGlobal.GetContext(), aGlobal.Get());
michael@0:   JSObject* data = Uint8ClampedArray::Create(aGlobal.GetContext(),
michael@0:                                              length.value());
michael@0:   if (!data) {
michael@0:     aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
michael@0:     return nullptr;
michael@0:   }
michael@0:   return new ImageData(aWidth, aHeight, *data);
michael@0: }
michael@0: 
michael@0: //static
michael@0: ImageData*
michael@0: ImageData::Constructor(const GlobalObject& aGlobal,
michael@0:                        const Uint8ClampedArray& aData,
michael@0:                        const uint32_t aWidth,
michael@0:                        const Optional<uint32_t>& aHeight,
michael@0:                        ErrorResult& aRv)
michael@0: {
michael@0:   aData.ComputeLengthAndData();
michael@0: 
michael@0:   uint32_t length = aData.Length();
michael@0:   if (length == 0 || length % 4) {
michael@0:     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
michael@0:     return nullptr;
michael@0:   }
michael@0:   length /= 4;
michael@0:   if (aWidth == 0) {
michael@0:     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
michael@0:     return nullptr;
michael@0:   }
michael@0:   uint32_t height = length / aWidth;
michael@0:   if (length != aWidth * height ||
michael@0:       (aHeight.WasPassed() && aHeight.Value() != height)) {
michael@0:     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
michael@0:     return nullptr;
michael@0:   }
michael@0:   return new ImageData(aWidth, height, *aData.Obj());
michael@0: }
michael@0: 
michael@0: void
michael@0: ImageData::HoldData()
michael@0: {
michael@0:   mozilla::HoldJSObjects(this);
michael@0: }
michael@0: 
michael@0: void
michael@0: ImageData::DropData()
michael@0: {
michael@0:   if (mData) {
michael@0:     mData = nullptr;
michael@0:     mozilla::DropJSObjects(this);
michael@0:   }
michael@0: }
michael@0: 
michael@0: JSObject*
michael@0: ImageData::WrapObject(JSContext* cx)
michael@0: {
michael@0:   return ImageDataBinding::Wrap(cx, this);
michael@0: }
michael@0: 
michael@0: } // namespace dom
michael@0: } // namespace mozilla