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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 //shadow gets a color inversely proportional to the |
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48 //alpha value |
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49 s = (s*(255-as))/255; |
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50 //then do standard blending |
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51 return as*s + av*v -(av*as*s)/255; |
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52 } |
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53 |
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54 static inline QRgb blendShade( QRgb v, QRgb s ) |
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55 { |
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56 //pick a number: shadow is 1/3 of object |
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57 int as = qAlpha(s)/3; |
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58 int av = qAlpha(v); |
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59 if ( as == 0 || av == 255 ) |
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60 return v; |
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61 |
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62 int a = as + av -(as*av)/255; |
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63 |
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64 |
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65 int r = blendComponent( qRed(v),av, qRed(s), as)/a; |
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66 int g = blendComponent( qGreen(v),av, qGreen(s), as)/a; |
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67 int b = blendComponent( qBlue(v),av, qBlue(s), as)/a; |
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68 |
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69 return qRgba(r,g,b,a); |
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70 } |
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71 |
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72 int main( int*, char**) |
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73 { |
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74 QImage *img; |
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75 |
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76 img = new QImage( "in.png" ); |
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77 int w,h; |
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78 int y; |
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79 img->setAlphaBuffer( TRUE ); |
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80 *img = img->convertDepth( 32 ); |
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81 w = img->width(); |
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82 h = img->height(); |
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83 #if 0 |
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84 for ( y = 0; y < h; y ++ ) { |
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85 uint *line = (uint*)img->scanLine( y ); |
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86 for ( int x = 0; x < w; x++ ) { |
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87 uint pixel = line[x]; |
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88 int r = qRed(pixel); |
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89 int g = qGreen(pixel); |
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90 int b = qBlue(pixel); |
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91 int min = QMIN( r, QMIN( g, b ) ); |
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92 int max = QMAX( r, QMAX( g, b ) ); |
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93 r -= min; |
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94 g -= min; |
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95 b -= min; |
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96 if ( max !=min ) { |
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97 r = (r*255)/(max-min); |
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98 g = (g*255)/(max-min); |
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99 b = (b*255)/(max-min); |
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100 } |
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101 int a = 255-min; |
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102 a -= (max-min)/3; //hack more transparency for colors. |
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103 line[x] = qRgba( r, g, b, a ); |
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104 } |
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105 } |
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106 #endif |
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107 *img = img->smoothScale( w/2, h/2 ); |
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108 |
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109 qDebug( "saving out.png"); |
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110 img->save( "out.png", "PNG" ); |
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111 |
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112 w = img->width(); |
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113 h = img->height(); |
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114 |
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115 QImage *img2 = new QImage( w, h, 32 ); |
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116 img2->setAlphaBuffer( TRUE ); |
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117 for ( y = 0; y < h; y++ ) { |
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118 for ( int x = 0; x < w; x++ ) { |
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119 QRgb shader = img->pixel( x, y ); |
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120 |
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121 int as = qAlpha(shader)/3; |
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122 |
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123 int r = (qRed(shader)*(255-as))/255; |
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124 int g = (qGreen(shader)*(255-as))/255; |
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125 int b = (qBlue(shader)*(255-as))/255; |
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126 |
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127 img2->setPixel( x, y, qRgba(r,g,b,as) ); |
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128 } |
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129 } |
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130 |
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131 img2->save( "outshade.png", "PNG" ); |
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132 |
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133 } |