pjs/layout/style/nsFontFaceLoader.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
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* for the specific language governing rights and limitations under the
* License.
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* The Original Code is Mozilla Foundation code.
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* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
* John Daggett <jdaggett@mozilla.com>
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* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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/* code for loading in @font-face defined font data */
#ifndef nsFontFaceLoader_h_
#define nsFontFaceLoader_h_
#include "nsCOMPtr.h"
#include "nsIPresShell.h"
#include "nsIStreamLoader.h"
#include "nsIURI.h"
#include "nsIChannel.h"
#include "gfxUserFontSet.h"
#include "nsHashKeys.h"
#include "nsTHashtable.h"
class nsIRequest;
class nsISupports;
class nsIPresShell;
class nsPresContext;
class nsIPrincipal;
class nsFontFaceLoader;
// nsUserFontSet - defines the loading mechanism for downloadable fonts
class nsUserFontSet : public gfxUserFontSet
{
public:
nsUserFontSet(nsPresContext *aContext);
~nsUserFontSet();
// Called when this font set is no longer associated with a presentation.
void Destroy();
// starts loading process, creating and initializing a nsFontFaceLoader obj
// returns whether load process successfully started or not
nsresult StartLoad(gfxFontEntry *aFontToLoad,
const gfxFontFaceSrc *aFontFaceSrc);
// Called by nsFontFaceLoader when the loader has completed normally.
// It's removed from the mLoaders set.
void RemoveLoader(nsFontFaceLoader *aLoader);
nsPresContext *GetPresContext() { return mPresContext; }
protected:
nsPresContext *mPresContext; // weak reference
// Set of all loaders pointing to us. These are not strong pointers,
// but that's OK because nsFontFaceLoader always calls RemoveLoader on
// us before it dies (unless we die first).
nsTHashtable< nsPtrHashKey<nsFontFaceLoader> > mLoaders;
};
class nsFontFaceLoader : public nsIStreamLoaderObserver
{
public:
nsFontFaceLoader(gfxFontEntry *aFontToLoad, nsIURI *aFontURI,
nsUserFontSet *aFontSet, nsIChannel *aChannel);
virtual ~nsFontFaceLoader();
NS_DECL_ISUPPORTS
NS_DECL_NSISTREAMLOADEROBSERVER
// initiate the load
nsresult Init();
// cancel the load and remove its reference to mFontSet
void Cancel();
void DropChannel() { mChannel = nsnull; }
static nsresult CheckLoadAllowed(nsIPrincipal* aSourcePrincipal,
nsIURI* aTargetURI,
nsISupports* aContext);
private:
nsRefPtr<gfxFontEntry> mFontEntry;
nsCOMPtr<nsIURI> mFontURI;
nsRefPtr<nsUserFontSet> mFontSet;
nsCOMPtr<nsIChannel> mChannel;
};
#endif /* !defined(nsFontFaceLoader_h_) */