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Diffstat (limited to 'examples/graphicsview/portedcanvas/makeimg.cpp')
| -rw-r--r-- | examples/graphicsview/portedcanvas/makeimg.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/examples/graphicsview/portedcanvas/makeimg.cpp b/examples/graphicsview/portedcanvas/makeimg.cpp new file mode 100644 index 0000000..93a8efe --- /dev/null +++ b/examples/graphicsview/portedcanvas/makeimg.cpp @@ -0,0 +1,133 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <qimage.h> +#include <qcolor.h> + +static inline int blendComponent( int v, int av, int s, int as ) +{ + //shadow gets a color inversely proportional to the + //alpha value + s = (s*(255-as))/255; + //then do standard blending + return as*s + av*v -(av*as*s)/255; +} + +static inline QRgb blendShade( QRgb v, QRgb s ) +{ + //pick a number: shadow is 1/3 of object + int as = qAlpha(s)/3; + 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 *img; + + img = new QImage( "in.png" ); + int w,h; + int y; + img->setAlphaBuffer( TRUE ); + *img = img->convertDepth( 32 ); + w = img->width(); + h = img->height(); +#if 0 + for ( y = 0; y < h; y ++ ) { + uint *line = (uint*)img->scanLine( y ); + for ( int x = 0; x < w; x++ ) { + uint pixel = line[x]; + int r = qRed(pixel); + int g = qGreen(pixel); + int b = qBlue(pixel); + int min = QMIN( r, QMIN( g, b ) ); + int max = QMAX( r, QMAX( g, b ) ); + r -= min; + g -= min; + b -= min; + if ( max !=min ) { + r = (r*255)/(max-min); + g = (g*255)/(max-min); + b = (b*255)/(max-min); + } + int a = 255-min; + a -= (max-min)/3; //hack more transparency for colors. + line[x] = qRgba( r, g, b, a ); + } + } +#endif + *img = img->smoothScale( w/2, h/2 ); + + qDebug( "saving out.png"); + img->save( "out.png", "PNG" ); + + w = img->width(); + h = img->height(); + + QImage *img2 = new QImage( w, h, 32 ); + img2->setAlphaBuffer( TRUE ); + for ( y = 0; y < h; y++ ) { + for ( int x = 0; x < w; x++ ) { + QRgb shader = img->pixel( x, y ); + + int as = qAlpha(shader)/3; + + int r = (qRed(shader)*(255-as))/255; + int g = (qGreen(shader)*(255-as))/255; + int b = (qBlue(shader)*(255-as))/255; + + img2->setPixel( x, y, qRgba(r,g,b,as) ); + } + } + + img2->save( "outshade.png", "PNG" ); + +} |