[2] | 1 | /****************************************************************************
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| 2 | **
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[651] | 3 | ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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[561] | 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation ([email protected])
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[2] | 6 | **
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| 7 | ** This file is part of the examples of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in
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| 14 | ** a written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Lesser General Public License Usage
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 18 | ** General Public License version 2.1 as published by the Free Software
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| 19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 20 | ** packaging of this file. Please review the following information to
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| 21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 23 | **
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[561] | 24 | ** In addition, as a special exception, Nokia gives you certain additional
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| 25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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| 26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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[2] | 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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[561] | 36 | ** If you have questions regarding the use of this file, please contact
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| 37 | ** Nokia at [email protected].
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[2] | 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | #include <qimage.h>
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| 43 | #include <qcolor.h>
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| 44 |
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| 45 | static inline int blendComponent( int v, int av, int s, int as )
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| 46 | {
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| 47 | return as*s + av*v -(av*as*s)/255;
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| 48 | }
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| 49 |
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| 50 | static inline QRgb blendShade( QRgb v, QRgb s )
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| 51 | {
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| 52 | //shadow image is already reduced and blurred
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| 53 | int as = qAlpha(s);
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| 54 | int av = qAlpha(v);
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| 55 | if ( as == 0 || av == 255 )
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| 56 | return v;
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| 57 |
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| 58 | int a = as + av -(as*av)/255;
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| 59 |
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| 60 | int r = blendComponent( qRed(v),av, qRed(s), as)/a;
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| 61 | int g = blendComponent( qGreen(v),av, qGreen(s), as)/a;
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| 62 | int b = blendComponent( qBlue(v),av, qBlue(s), as)/a;
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| 63 |
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| 64 | return qRgba(r,g,b,a);
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| 65 | }
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| 66 |
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| 67 |
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| 68 |
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| 69 | int main( int*, char**)
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| 70 | {
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| 71 | QImage image( "out.png" );
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| 72 | image.convertDepth( 32 );
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| 73 | QImage shade( "outshade.png" );
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| 74 | shade.convertDepth( 32 );
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| 75 | int dx = 10;
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| 76 | int dy = 5;
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| 77 |
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| 78 | int w = image.width();
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| 79 | int h = image.height();
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| 80 |
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| 81 | QImage img( w+dx, h+dy, 32 );
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| 82 | img.setAlphaBuffer( TRUE );
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| 83 |
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| 84 | for ( int y = 0; y < h+dy; y++ ) {
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| 85 | for ( int x = 0; x < w+dx; x++ ) {
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| 86 | QRgb sh = (x<dx||y<dy) ? 0 : shade.pixel( x-dx, y-dy );
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| 87 | QRgb pixel = (x<w&y<h) ? image.pixel( x, y ) : 0;
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| 88 | img.setPixel( x, y, blendShade( pixel, sh ) );
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| 89 | }
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| 90 | }
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| 91 | img.save("blend.png", "PNG" );
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| 92 | }
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| 93 |
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| 94 |
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