1 files changed, 93 insertions, 0 deletions
diff --git a/examples/graphicsview/portedcanvas/blendshadow.cpp b/examples/graphicsview/portedcanvas/blendshadow.cpp
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+++ b/examples/graphicsview/portedcanvas/blendshadow.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** 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 Nokia Corporation 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" );
+}
+
+