gecko-dev/gfx/thebes/gfxAlphaRecovery.h

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/* -*- 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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef _GFXALPHARECOVERY_H_
#define _GFXALPHARECOVERY_H_
#include "gfxContext.h"
#include "gfxImageSurface.h"
class THEBES_API gfxAlphaRecovery {
public:
struct Analysis {
PRBool uniformColor;
PRBool uniformAlpha;
gfxFloat alpha;
gfxFloat r, g, b;
};
/* Given two surfaces of equal size with the same rendering, one onto a
* black background and the other onto white, recovers alpha values from
* the difference and sets the alpha values on the black surface.
* The surfaces must have format RGB24 or ARGB32.
* Returns PR_TRUE on success.
*/
static PRBool RecoverAlpha (gfxImageSurface *blackSurface,
const gfxImageSurface *whiteSurface,
Analysis *analysis = nsnull);
/* This does the save as the previous function, only using SSE2
* optimizations, usually this should not be called directly.
*/
static PRBool RecoverAlphaSSE2 (gfxImageSurface *blackSurface,
const gfxImageSurface *whiteSurface);
};
#endif /* _GFXALPHARECOVERY_H_ */