/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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/. */

/* code for loading in @font-face defined font data */

#ifndef nsFontFaceLoader_h_

#define nsFontFaceLoader_h_

#include "mozilla/Attributes.h"

#include "mozilla/TimeStamp.h"

#include "mozilla/dom/FontFaceSet.h"

#include "nsCOMPtr.h"

#include "nsIStreamLoader.h"

#include "nsIChannel.h"

#include "nsIRequestObserver.h"

#include "gfxUserFontSet.h"

#include "nsHashKeys.h"

#include "nsTHashtable.h"

class nsIPrincipal;

class nsFontFaceLoader final : public nsIStreamLoaderObserver

                             , public nsIRequestObserver

{

public:

  nsFontFaceLoader(gfxUserFontEntry* aFontToLoad, nsIURI* aFontURI,

                   mozilla::dom::FontFaceSet* aFontFaceSet,

                   nsIChannel* aChannel);

  NS_DECL_ISUPPORTS

  NS_DECL_NSISTREAMLOADEROBSERVER

  NS_DECL_NSIREQUESTOBSERVER

  // initiate the load

  nsresult Init();

  // cancel the load and remove its reference to mFontFaceSet

  void Cancel();

  void DropChannel() { mChannel = nullptr; }

  void StartedLoading(nsIStreamLoader* aStreamLoader);

  static void LoadTimerCallback(nsITimer* aTimer, void* aClosure);

  gfxUserFontEntry* GetUserFontEntry() const { return mUserFontEntry; }

protected:

  virtual ~nsFontFaceLoader();

  // helper method for determining the font-display value

  uint8_t GetFontDisplay();

private:

  RefPtr<gfxUserFontEntry>  mUserFontEntry;

  nsCOMPtr<nsIURI>        mFontURI;

  RefPtr<mozilla::dom::FontFaceSet> mFontFaceSet;

  nsCOMPtr<nsIChannel>    mChannel;

  nsCOMPtr<nsITimer>      mLoadTimer;

  mozilla::TimeStamp      mStartTime;

  nsIStreamLoader*        mStreamLoader;

};

#endif /* !defined(nsFontFaceLoader_h_) */