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ImageData.h (2794B)

      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 #ifndef mozilla_dom_ImageData_h
      8 #define mozilla_dom_ImageData_h
      9 
     10 #include <cstdint>
     11 
     12 #include "js/RootingAPI.h"
     13 #include "mozilla/AlreadyAddRefed.h"
     14 #include "mozilla/dom/TypedArray.h"
     15 #include "nsCycleCollectionParticipant.h"
     16 #include "nsISupports.h"
     17 #include "nsWrapperCache.h"
     18 
     19 class JSObject;
     20 class nsIGlobalObject;
     21 struct JSContext;
     22 struct JSStructuredCloneReader;
     23 struct JSStructuredCloneWriter;
     24 
     25 namespace mozilla {
     26 class ErrorResult;
     27 
     28 namespace dom {
     29 
     30 class GlobalObject;
     31 template <typename T>
     32 class Optional;
     33 
     34 // ImageData extends nsWrapperCache only to support nursery allocated wrapper.
     35 class ImageData final : public nsISupports, public nsWrapperCache {
     36 public:
     37  ImageData(nsISupports* aOwner, uint32_t aWidth, uint32_t aHeight,
     38            JS::Handle<JSObject*> aData)
     39      : mOwner(aOwner), mWidth(aWidth), mHeight(aHeight), mData(aData) {
     40    HoldData();
     41  }
     42 
     43  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
     44  NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(ImageData)
     45 
     46  nsISupports* GetParentObject() const { return mOwner; }
     47 
     48  static already_AddRefed<ImageData> Constructor(const GlobalObject& aGlobal,
     49                                                 const uint32_t aWidth,
     50                                                 const uint32_t aHeight,
     51                                                 ErrorResult& aRv);
     52 
     53  static already_AddRefed<ImageData> Constructor(
     54      const GlobalObject& aGlobal, const Uint8ClampedArray& aData,
     55      const uint32_t aWidth, const Optional<uint32_t>& aHeight,
     56      ErrorResult& aRv);
     57 
     58  uint32_t Width() const { return mWidth; }
     59  uint32_t Height() const { return mHeight; }
     60  void GetData(JSContext* cx, JS::MutableHandle<JSObject*> aData) const {
     61    aData.set(GetDataObject());
     62  }
     63  JSObject* GetDataObject() const { return mData; }
     64 
     65  JSObject* WrapObject(JSContext*, JS::Handle<JSObject*> aGivenProto) override;
     66 
     67  //[Serializable] implementation
     68  static already_AddRefed<ImageData> ReadStructuredClone(
     69      JSContext* aCx, nsIGlobalObject* aGlobal,
     70      JSStructuredCloneReader* aReader);
     71  bool WriteStructuredClone(JSContext* aCx,
     72                            JSStructuredCloneWriter* aWriter) const;
     73 
     74 private:
     75  void HoldData();
     76  void DropData();
     77 
     78  ImageData() = delete;
     79  ~ImageData() { DropData(); }
     80 
     81  nsCOMPtr<nsISupports> mOwner;
     82 
     83  const uint32_t mWidth;
     84  const uint32_t mHeight;
     85 
     86  JS::Heap<JSObject*> mData;
     87 };
     88 
     89 }  // namespace dom
     90 }  // namespace mozilla
     91 
     92 #endif  // mozilla_dom_ImageData_h