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00012 #include <qimage.h>
00013 #include <qstring.h>
00014 #include <qapplication.h>
00015 #include <math.h>
00016
00017
00018 #include "painting.h"
00019 #include "../../gui/statusWidget.h"
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00058 struct Triplet
00059 { int r,g,b; };
00060
00061 struct Histogram
00062 {
00063
00064 Triplet values[256];
00065
00066
00067 Triplet highestCountIndex;
00068 };
00069
00070 Histogram histogram;
00071
00072 void resetHistogram()
00073 {
00074 static int i;
00075 for(i=0;i<256;i++)
00076 {
00077 histogram.values[i].r = 0;
00078 histogram.values[i].g = 0;
00079 histogram.values[i].b = 0;
00080 }
00081 histogram.highestCountIndex.r = 0;
00082 histogram.highestCountIndex.g = 0;
00083 histogram.highestCountIndex.b = 0;
00084 }
00085
00086 void findHighestCounts()
00087 {
00088 static int i;
00089 for(i = 1; i<256; i++)
00090 {
00091 if( histogram.values[i].r > histogram.values[ histogram.highestCountIndex.r ].r )
00092 { histogram.highestCountIndex.r = i; }
00093
00094 if( histogram.values[i].g > histogram.values[ histogram.highestCountIndex.g ].g )
00095 { histogram.highestCountIndex.g = i; }
00096
00097 if( histogram.values[i].b > histogram.values[ histogram.highestCountIndex.b ].b )
00098 { histogram.highestCountIndex.b = i; }
00099 }
00100 }
00101
00102 QImage* oilPaintingEffect( QString filename, StatusWidget* status )
00103 {
00104
00105 QImage originalImage( filename );
00106
00107
00108 bool useBusyIndicators = (status != NULL);
00109
00110
00111 if(useBusyIndicators)
00112 {
00113 QString statusMessage = qApp->translate( "oilPaintingEffect", "Applying Oil Painting Effect:" );
00114 status->showProgressBar( statusMessage, 100 );
00115 qApp->processEvents();
00116 }
00117
00118
00119 const int updateIncrement = (int) ( 0.01 * originalImage.width() * originalImage.height() );
00120 int newProgress = 0;
00121
00122
00123 QImage* editedImage = new QImage( filename );
00124
00125
00126 double minDimen = (double) QMIN( editedImage->width(), editedImage->height() );
00127 const int RADIUS = (int) QMAX( 2, (sqrt(minDimen)/4) );
00128
00129
00130 int originalImageX, originalImageY;
00131 int editedImageX, editedImageY;
00132 int clampedX, clampedY;
00133 int trailingEdgeY, leadingEdgeY;
00134
00135 QRgb* rgb;
00136 uchar* scanLine;
00137 uchar* trailingScanLine;
00138 uchar* leadingScanLine;
00139
00140
00141 for( editedImageX=0; editedImageX < editedImage->width(); editedImageX++)
00142 {
00143
00144
00145 resetHistogram();
00146
00147
00148 for(originalImageY = 0 - 1 - RADIUS;
00149 originalImageY <= 0 - 1 + RADIUS;
00150 originalImageY++)
00151 {
00152 clampedY = QMAX( QMIN( originalImageY, originalImage.height() - 1 ), 0 );
00153 scanLine = originalImage.scanLine( clampedY );
00154
00155 for(originalImageX = editedImageX - RADIUS;
00156 originalImageX <= editedImageX + RADIUS;
00157 originalImageX++)
00158 {
00159 clampedX = QMAX( QMIN( originalImageX, originalImage.width() - 1 ), 0 );
00160
00161
00162 rgb = ((QRgb*)scanLine+clampedX);
00163
00164
00165 histogram.values[ qRed(*rgb) ].r++;
00166 histogram.values[ qGreen(*rgb) ].g++;
00167 histogram.values[ qBlue(*rgb) ].b++;
00168 }
00169 }
00170
00171
00172
00173 for( editedImageY=0; editedImageY < editedImage->height(); editedImageY++)
00174 {
00175 trailingEdgeY = QMAX( QMIN( editedImageY-1-RADIUS, originalImage.height() - 1 ), 0 );
00176 leadingEdgeY = QMAX( QMIN( editedImageY+RADIUS, originalImage.height() - 1 ), 0 );
00177
00178 trailingScanLine = originalImage.scanLine( trailingEdgeY );
00179 leadingScanLine = originalImage.scanLine( leadingEdgeY );
00180
00181 for(originalImageX = editedImageX - RADIUS;
00182 originalImageX <= editedImageX + RADIUS;
00183 originalImageX++)
00184 {
00185 clampedX = QMAX( QMIN( originalImageX, originalImage.width() - 1 ), 0 );
00186
00187
00188 rgb = ((QRgb*)trailingScanLine+clampedX);
00189 histogram.values[ qRed(*rgb) ].r--;
00190 histogram.values[ qGreen(*rgb) ].g--;
00191 histogram.values[ qBlue(*rgb) ].b--;
00192
00193
00194 rgb = ((QRgb*)leadingScanLine+clampedX);
00195 histogram.values[ qRed(*rgb) ].r++;
00196 histogram.values[ qGreen(*rgb) ].g++;
00197 histogram.values[ qBlue(*rgb) ].b++;
00198 }
00199
00200
00201 findHighestCounts();
00202
00203
00204
00205 scanLine = editedImage->scanLine( editedImageY );
00206 rgb = ((QRgb*)scanLine+editedImageX);
00207 *rgb = qRgb( (qRed(*rgb) + histogram.highestCountIndex.r) / 2,
00208 (qGreen(*rgb) + histogram.highestCountIndex.g) / 2,
00209 (qBlue(*rgb) + histogram.highestCountIndex.b) / 2 );
00210
00211
00212
00213 if(useBusyIndicators)
00214 {
00215 newProgress++;
00216 if(newProgress >= updateIncrement)
00217 {
00218 newProgress = 0;
00219 status->incrementProgress();
00220 qApp->processEvents();
00221 }
00222 }
00223
00224 }
00225 }
00226
00227
00228 return editedImage;
00229 }
00230