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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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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