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68 lines
2.7 KiB
C++
68 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Robert O'Callahan <robert@ocallahan.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_UTILS_H
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#define GFX_UTILS_H
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#include "gfxTypes.h"
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class gfxImageSurface;
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class THEBES_API gfxUtils {
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public:
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static PRBool FuzzyEqual(gfxFloat aV1, gfxFloat aV2) {
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return fabs(aV2 - aV1) < 1e-6;
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}
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/*
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* Premultiply or Unpremultiply aSourceSurface, writing the result
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* to aDestSurface or back into aSourceSurface if aDestSurface is null.
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*
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* If aDestSurface is given, it must have identical format, dimensions, and
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* stride as the source.
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*
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* If the source is not ImageFormatARGB32, no operation is performed. If
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* aDestSurface is given, the data is copied over.
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*/
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static void PremultiplyImageSurface(gfxImageSurface *aSourceSurface,
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gfxImageSurface *aDestSurface = nsnull);
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static void UnpremultiplyImageSurface(gfxImageSurface *aSurface,
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gfxImageSurface *aDestSurface = nsnull);
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};
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#endif
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