gecko/gfx/thebes/gfxAlphaRecovery.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * ***** 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/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Thebes gfx.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir@pobox.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#ifndef _GFXALPHARECOVERY_H_
#define _GFXALPHARECOVERY_H_

#include "gfxContext.h"
#include "gfxImageSurface.h"

class THEBES_API gfxAlphaRecovery {
public:
    /* Given two RGB24 surfaces with the same rendering, one on a black
     * background and the other on white, return a new surface
     * that contains the contents with recovered alpha.
     */
    static already_AddRefed<gfxImageSurface> RecoverAlpha (gfxImageSurface *blackSurface,
                                                           gfxImageSurface *whiteSurface,
                                                           gfxIntSize dimensions);
};

#endif /* _GFXALPHARECOVERY_H_ */