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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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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 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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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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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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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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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 |