ImageData.h - mozsearch

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim:set ts=2 sw=2 et tw=78: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_ImageData_h

#define mozilla_dom_ImageData_h

#include <cstdint>

#include <utility>

#include "js/RootingAPI.h"

#include "mozilla/AlreadyAddRefed.h"

#include "mozilla/Assertions.h"

#include "mozilla/dom/TypedArray.h"

#include "nsCycleCollectionParticipant.h"

#include "nsISupports.h"

class JSObject;

class nsIGlobalObject;

struct JSContext;

struct JSStructuredCloneReader;

struct JSStructuredCloneWriter;

namespace mozilla {

class ErrorResult;

namespace dom {

class GlobalObject;

template <typename T>

class Optional;

class ImageData final : public nsISupports {

 public:

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(ImageData)

  const uint32_t mWidth;

  const uint32_t mHeight;

 private:

  JS::Heap<JSObject*> mData;

 public:

  ImageData(uint32_t aWidth, uint32_t aHeight, JSObject& aData)

      : mWidth(aWidth), mHeight(aHeight), mData(&aData) {

    HoldData();

  static already_AddRefed<ImageData> Constructor(const GlobalObject& aGlobal,

                                                 const uint32_t aWidth,

                                                 const uint32_t aHeight,

                                                 ErrorResult& aRv);

  static already_AddRefed<ImageData> Constructor(

      const GlobalObject& aGlobal, const Uint8ClampedArray& aData,

      const uint32_t aWidth, const Optional<uint32_t>& aHeight,

      ErrorResult& aRv);

  uint32_t Width() const { return mWidth; }

  uint32_t Height() const { return mHeight; }

  void GetData(JSContext* cx, JS::MutableHandle<JSObject*> aData) const {

    aData.set(GetDataObject());

  JSObject* GetDataObject() const { return mData; }

  bool WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,

                  JS::MutableHandle<JSObject*> aReflector);

  //[Serializable] implementation

  static already_AddRefed<ImageData> ReadStructuredClone(

      JSContext* aCx, nsIGlobalObject* aGlobal,

      JSStructuredCloneReader* aReader);

  bool WriteStructuredClone(JSContext* aCx,

                            JSStructuredCloneWriter* aWriter) const;

 private:

  void HoldData();

  void DropData();

  ImageData() = delete;

  ~ImageData() { DropData(); }

};

}  // namespace dom

}  // namespace mozilla

#endif  // mozilla_dom_ImageData_h