import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/style/nsFontFaceLoader.h

@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+// vim:cindent:ts=2:et:sw=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/. */
+
+/* code for loading in @font-face defined font data */
+
+#ifndef nsFontFaceLoader_h_
+#define nsFontFaceLoader_h_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/TimeStamp.h"
+#include "nsCOMPtr.h"
+#include "nsIStreamLoader.h"
+#include "nsIChannel.h"
+#include "gfxUserFontSet.h"
+#include "nsHashKeys.h"
+#include "nsTHashtable.h"
+#include "nsCSSRules.h"
+
+class nsIPrincipal;
+
+class nsFontFaceLoader : public nsIStreamLoaderObserver
+{
+public:
+  nsFontFaceLoader(gfxUserFontEntry* aFontToLoad, nsIURI* aFontURI,
+                   mozilla::dom::FontFaceSet* aFontFaceSet,
+                   nsIChannel* aChannel);
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISTREAMLOADEROBSERVER 
+
+  // 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_) */