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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <qimage.h>
#include <qcolor.h>
static inline int blendComponent( int v, int av, int s, int as )
{
return as*s + av*v -(av*as*s)/255;
}
static inline QRgb blendShade( QRgb v, QRgb s )
{
//shadow image is already reduced and blurred
int as = qAlpha(s);
int av = qAlpha(v);
if ( as == 0 || av == 255 )
return v;
int a = as + av -(as*av)/255;
int r = blendComponent( qRed(v),av, qRed(s), as)/a;
int g = blendComponent( qGreen(v),av, qGreen(s), as)/a;
int b = blendComponent( qBlue(v),av, qBlue(s), as)/a;
return qRgba(r,g,b,a);
}
int main( int*, char**)
{
QImage image( "out.png" );
image.convertDepth( 32 );
QImage shade( "outshade.png" );
shade.convertDepth( 32 );
int dx = 10;
int dy = 5;
int w = image.width();
int h = image.height();
QImage img( w+dx, h+dy, 32 );
img.setAlphaBuffer( TRUE );
for ( int y = 0; y < h+dy; y++ ) {
for ( int x = 0; x < w+dx; x++ ) {
QRgb sh = (x<dx||y<dy) ? 0 : shade.pixel( x-dx, y-dy );
QRgb pixel = (x<w&y<h) ? image.pixel( x, y ) : 0;
img.setPixel( x, y, blendShade( pixel, sh ) );
}
}
img.save("blend.png", "PNG" );
}
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