layout/style/nsFontFaceLoader.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* code for loading in @font-face defined font data */
   8
   9 #ifndef nsFontFaceLoader_h_
  10 #define nsFontFaceLoader_h_
  11
  12 #include "mozilla/Attributes.h"
  13 #include "mozilla/TimeStamp.h"
  14 #include "mozilla/dom/FontFaceSetImpl.h"
  15 #include "nsCOMPtr.h"
  16 #include "nsIFontLoadCompleteCallback.h"
  17 #include "nsIStreamLoader.h"
  18 #include "nsIChannel.h"
  19 #include "nsIRequestObserver.h"
  20 #include "gfxUserFontSet.h"
  21 #include "nsHashKeys.h"
  22 #include "nsTHashtable.h"
  23
  24 class nsIPrincipal;
  25 class nsITimer;
  26
  27 class nsFontFaceLoader final : public nsIStreamLoaderObserver,
  28                                public nsIRequestObserver,
  29                                public nsIFontLoadCompleteCallback {
  30  public:
  31   nsFontFaceLoader(gfxUserFontEntry* aUserFontEntry, uint32_t aSrcIndex,
  32                    mozilla::dom::FontFaceSetImpl* aFontFaceSet,
  33                    nsIChannel* aChannel);
  34
  35   NS_DECL_ISUPPORTS
  36   NS_DECL_NSISTREAMLOADEROBSERVER
  37   NS_DECL_NSIREQUESTOBSERVER
  38
  39   // cancel the load and remove its reference to mFontFaceSet
  40   void Cancel();
  41
  42   void DropChannel() { mChannel = nullptr; }
  43
  44   void StartedLoading(nsIStreamLoader* aStreamLoader);
  45
  46   static void LoadTimerCallback(nsITimer* aTimer, void* aClosure);
  47
  48   gfxUserFontEntry* GetUserFontEntry() const { return mUserFontEntry; }
  49
  50   // Called by the gfxUserFontEntry once it has finished the platform font
  51   // loading.
  52   NS_IMETHODIMP FontLoadComplete() final;
  53
  54  protected:
  55   virtual ~nsFontFaceLoader();
  56
  57   // helper method for determining the font-display value
  58   mozilla::StyleFontDisplay GetFontDisplay();
  59
  60  private:
  61   RefPtr<gfxUserFontEntry> mUserFontEntry;
  62   nsCOMPtr<nsIURI> mFontURI;
  63   // Cleared in FontFaceSet::~FontFaceSet, and on cancelation and such too.
  64   mozilla::dom::FontFaceSetImpl* MOZ_NON_OWNING_REF mFontFaceSet;
  65   nsCOMPtr<nsIChannel> mChannel;
  66   nsCOMPtr<nsITimer> mLoadTimer;
  67   mozilla::TimeStamp mStartTime;
  68   nsIStreamLoader* mStreamLoader;
  69   uint32_t mSrcIndex;
  70   bool mInStreamComplete = false;
  71   bool mInLoadTimerCallback = false;
  72 };
  73
  74 #endif /* !defined(nsFontFaceLoader_h_) */