Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim:set ts=2 sw=2 et tw=78: */
       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 file,
       5             :  * You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #include "mozilla/dom/ImageData.h"
       8             : 
       9             : #include "mozilla/CheckedInt.h"
      10             : #include "mozilla/HoldDropJSObjects.h"
      11             : #include "mozilla/dom/ImageDataBinding.h"
      12             : 
      13             : #include "jsapi.h"
      14             : 
      15             : namespace mozilla {
      16             : namespace dom {
      17             : 
      18           0 : NS_IMPL_CYCLE_COLLECTING_ADDREF(ImageData)
      19           0 : NS_IMPL_CYCLE_COLLECTING_RELEASE(ImageData)
      20             : 
      21             : NS_IMPL_CYCLE_COLLECTION_CLASS(ImageData)
      22             : 
      23           0 : NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ImageData)
      24           0 :   NS_INTERFACE_MAP_ENTRY(nsISupports)
      25           0 : NS_INTERFACE_MAP_END
      26             : 
      27           0 : NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ImageData)
      28           0 :   NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mData)
      29           0 : NS_IMPL_CYCLE_COLLECTION_TRACE_END
      30             : 
      31           0 : NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ImageData)
      32           0 : NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
      33             : 
      34           0 : NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ImageData)
      35           0 :   tmp->DropData();
      36           0 : NS_IMPL_CYCLE_COLLECTION_UNLINK_END
      37             : 
      38             : //static
      39             : already_AddRefed<ImageData>
      40           0 : ImageData::Constructor(const GlobalObject& aGlobal,
      41             :                        const uint32_t aWidth,
      42             :                        const uint32_t aHeight,
      43             :                        ErrorResult& aRv)
      44             : {
      45           0 :   if (aWidth == 0 || aHeight == 0) {
      46           0 :     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
      47           0 :     return nullptr;
      48             :   }
      49           0 :   CheckedInt<uint32_t> length = CheckedInt<uint32_t>(aWidth) * aHeight * 4;
      50           0 :   if (!length.isValid()) {
      51           0 :     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
      52           0 :     return nullptr;
      53             :   }
      54           0 :   js::AssertSameCompartment(aGlobal.Context(), aGlobal.Get());
      55           0 :   JSObject* data = Uint8ClampedArray::Create(aGlobal.Context(),
      56           0 :                                              length.value());
      57           0 :   if (!data) {
      58           0 :     aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
      59           0 :     return nullptr;
      60             :   }
      61           0 :   RefPtr<ImageData> imageData = new ImageData(aWidth, aHeight, *data);
      62           0 :   return imageData.forget();
      63             : }
      64             : 
      65             : //static
      66             : already_AddRefed<ImageData>
      67           0 : ImageData::Constructor(const GlobalObject& aGlobal,
      68             :                        const Uint8ClampedArray& aData,
      69             :                        const uint32_t aWidth,
      70             :                        const Optional<uint32_t>& aHeight,
      71             :                        ErrorResult& aRv)
      72             : {
      73           0 :   aData.ComputeLengthAndData();
      74             : 
      75           0 :   uint32_t length = aData.Length();
      76           0 :   if (length == 0 || length % 4) {
      77           0 :     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
      78           0 :     return nullptr;
      79             :   }
      80           0 :   length /= 4;
      81           0 :   if (aWidth == 0) {
      82           0 :     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
      83           0 :     return nullptr;
      84             :   }
      85           0 :   uint32_t height = length / aWidth;
      86           0 :   if (length != aWidth * height ||
      87           0 :       (aHeight.WasPassed() && aHeight.Value() != height)) {
      88           0 :     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
      89           0 :     return nullptr;
      90             :   }
      91           0 :   if (JS_GetTypedArraySharedness(aData.Obj())) {
      92             :     // Throw if the object is mapping shared memory (must opt in).
      93           0 :     aRv.ThrowTypeError<MSG_TYPEDARRAY_IS_SHARED>(NS_LITERAL_STRING("Argument of ImageData constructor"));
      94           0 :     return nullptr;
      95             :   }
      96           0 :   RefPtr<ImageData> imageData = new ImageData(aWidth, height, *aData.Obj());
      97           0 :   return imageData.forget();
      98             : }
      99             : 
     100             : void
     101           0 : ImageData::HoldData()
     102             : {
     103           0 :   mozilla::HoldJSObjects(this);
     104           0 : }
     105             : 
     106             : void
     107           0 : ImageData::DropData()
     108             : {
     109           0 :   if (mData) {
     110           0 :     mData = nullptr;
     111           0 :     mozilla::DropJSObjects(this);
     112             :   }
     113           0 : }
     114             : 
     115             : bool
     116           0 : ImageData::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto, JS::MutableHandle<JSObject*> aReflector)
     117             : {
     118           0 :   return ImageDataBinding::Wrap(aCx, this, aGivenProto, aReflector);
     119             : }
     120             : 
     121             : } // namespace dom
     122             : } // namespace mozilla