MultipartImage.h - mozsearch

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/* -*- 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,

                                        nsIInputStream* aInStr,

                                        uint64_t aSourceOffset,

                                        uint32_t aCount) override;

  virtual nsresult OnImageDataComplete(nsIRequest* aRequest, 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