dom/canvas/ImageData.h
author Alex Gaynor <agaynor@mozilla.com>
Mon, 27 Nov 2017 14:37:34 -0600
changeset 403385 bcc0a91dd43feae18d4bf04d7db3d146035aa416
parent 392734 4137a8047398bfafe18d49b772c56e506cc8a5b4
child 404768 b2e9d1ed15f439f5eb84b0ea1591321fc7913481
permissions -rw-r--r--
Bug 1407693 - Part 2 - when a child process crashes, write extra annotation data to a pre-opened file descriptor instead of creating a new file; r=gsvelto,rbarker This removes the need for the content process to have permissions to create new files on macOS, allowing more aggressive sandboxing. MozReview-Commit-ID: 8agL5jwxDSL

/* -*- 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 "nsIDOMCanvasRenderingContext2D.h"

#include "mozilla/Attributes.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/TypedArray.h"
#include <stdint.h>

#include "nsCycleCollectionParticipant.h"
#include "nsISupportsImpl.h"
#include "js/RootingAPI.h"

namespace mozilla {
namespace dom {

class ImageData final : public nsISupports
{
  ~ImageData()
  {
    DropData();
  }

public:
  ImageData(uint32_t aWidth, uint32_t aHeight, JSObject& aData)
    : mWidth(aWidth)
    , mHeight(aHeight)
    , mData(&aData)
  {
    HoldData();
  }

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(ImageData)

  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);

private:
  void HoldData();
  void DropData();

  ImageData() = delete;

  uint32_t mWidth, mHeight;
  JS::Heap<JSObject*> mData;
};

} // namespace dom
} // namespace mozilla

#endif // mozilla_dom_ImageData_h