image/MultipartImage.h
author Chris Peterson <cpeterson@mozilla.com>
Sat, 28 Apr 2018 12:50:58 -0700
changeset 417178 a31c1b8a41f81fb564bd86e1c22617595d61a42d
parent 403504 91d647c847e56cb0db2be19647507cec207b1d08
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1457813 - Part 2: Replace non-asserting NS_PRECONDITIONs with MOZ_ASSERTs. r=froydnj s/NS_PRECONDITION/MOZ_ASSERT/ and reindent MozReview-Commit-ID: KuUsnVe2h8L

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

#include "ImageWrapper.h"
#include "IProgressObserver.h"
#include "ProgressTracker.h"

namespace mozilla {
namespace image {

class NextPartObserver;

/**
 * An Image wrapper that implements support for multipart/x-mixed-replace
 * images.
 */
class MultipartImage
  : public ImageWrapper
  , public IProgressObserver
{
public:
  MOZ_DECLARE_REFCOUNTED_TYPENAME(MultipartImage)
  // We need to always declare refcounting here, because
  // IProgressObserver has pure-virtual refcounting.
  NS_DECL_ISUPPORTS_INHERITED

  void BeginTransitionToPart(Image* aNextPart);

  // Overridden ImageWrapper methods:
  virtual already_AddRefed<imgIContainer> Unwrap() override;
  virtual already_AddRefed<ProgressTracker> GetProgressTracker() override;
  virtual void SetProgressTracker(ProgressTracker* aTracker) override;
  virtual nsresult OnImageDataAvailable(nsIRequest* aRequest,
                                        nsISupports* aContext,
                                        nsIInputStream* aInStr,
                                        uint64_t aSourceOffset,
                                        uint32_t aCount) override;
  virtual nsresult OnImageDataComplete(nsIRequest* aRequest,
                                       nsISupports* aContext,
                                       nsresult aStatus,
                                       bool aLastPart) override;

  // We don't support locking or track animation consumers for individual parts,
  // so we override these methods to do nothing.
  NS_IMETHOD LockImage() override { return NS_OK; }
  NS_IMETHOD UnlockImage() override { return NS_OK; }
  virtual void IncrementAnimationConsumers() override { }
  virtual void DecrementAnimationConsumers() override { }
#ifdef DEBUG
  virtual uint32_t GetAnimationConsumers() override { return 1; }
#endif

  // Overridden IProgressObserver methods:
  virtual void Notify(int32_t aType,
                      const nsIntRect* aRect = nullptr) override;
  virtual void OnLoadComplete(bool aLastPart) override;
  virtual void SetHasImage() override;
  virtual bool NotificationsDeferred() const override;
  virtual void MarkPendingNotify() override;
  virtual void ClearPendingNotify() override;

protected:
  virtual ~MultipartImage();

private:
  friend class ImageFactory;
  friend class NextPartObserver;

  explicit MultipartImage(Image* aFirstPart);
  void Init();

  void FinishTransition();

  RefPtr<ProgressTracker> mTracker;
  RefPtr<NextPartObserver> mNextPartObserver;
  RefPtr<Image> mNextPart;
  bool mPendingNotify : 1;
};

} // namespace image
} // namespace mozilla

#endif // mozilla_image_MultipartImage_h