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/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Qt Software Information ([email protected]) ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** 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 [email protected]. ** $QT_END_LICENSE$ ** ****************************************************************************/ #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" ); }
Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies) | Trademarks | Qt 4.5.1 |