nsFontFaceLoader.h

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/* -*- 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/FontFaceSetImpl.h"

#include "nsCOMPtr.h"

#include "nsIFontLoadCompleteCallback.h"

#include "nsIStreamLoader.h"

#include "nsIChannel.h"

#include "nsIRequestObserver.h"

#include "gfxUserFontSet.h"

#include "nsHashKeys.h"

#include "nsTHashtable.h"

class nsIPrincipal;

class nsITimer;

class nsFontFaceLoader final : public nsIStreamLoaderObserver,

                               public nsIRequestObserver,

                               public nsIFontLoadCompleteCallback {

 public:

  nsFontFaceLoader(gfxUserFontEntry* aUserFontEntry, uint32_t aSrcIndex,

                   mozilla::dom::FontFaceSetImpl* aFontFaceSet,

                   nsIChannel* aChannel);

  NS_DECL_ISUPPORTS

  NS_DECL_NSISTREAMLOADEROBSERVER

  NS_DECL_NSIREQUESTOBSERVER

  // 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; }

  // Called by the gfxUserFontEntry once it has finished the platform font

  // loading.

  NS_IMETHODIMP FontLoadComplete() final;

 protected:

  virtual ~nsFontFaceLoader();

  // helper method for determining the font-display value

  mozilla::StyleFontDisplay GetFontDisplay();

 private:

  RefPtr<gfxUserFontEntry> mUserFontEntry;

  nsCOMPtr<nsIURI> mFontURI;

  // Cleared in FontFaceSet::~FontFaceSet, and on cancelation and such too.

  mozilla::dom::FontFaceSetImpl* MOZ_NON_OWNING_REF mFontFaceSet;

  nsCOMPtr<nsIChannel> mChannel;

  nsCOMPtr<nsITimer> mLoadTimer;

  mozilla::TimeStamp mStartTime;

  nsIStreamLoader* mStreamLoader;

  uint32_t mSrcIndex;

  bool mInStreamComplete = false;

  bool mInLoadTimerCallback = false;

};

#endif /* !defined(nsFontFaceLoader_h_) */