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painting.h File Reference

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Functions

QImage * oilPaintingEffect (QString filename, StatusWidget *status)


Function Documentation

QImage* oilPaintingEffect QString  filename,
StatusWidget status
 

Definition at line 102 of file painting.cpp.

References Triplet::b, editedImage, findHighestCounts(), Triplet::g, Histogram::highestCountIndex, histogram, StatusWidget::incrementProgress(), newProgress, Triplet::r, resetHistogram(), StatusWidget::showProgressBar(), status, updateIncrement, and Histogram::values.

Referenced by EditingInterface::applyEffect().

00103 {
00104   //load original image  
00105   QImage originalImage( filename );
00106 
00107   //determine if busy indicators will be used
00108   bool useBusyIndicators = (status != NULL);
00109 
00110   //setup progress bar
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   //update progress bar for every 1% of completion
00119   const int updateIncrement = (int) ( 0.01 * originalImage.width() * originalImage.height() );
00120   int newProgress = 0; 
00121   
00122   //construct edited image
00123   QImage* editedImage = new QImage( filename );
00124   
00125   //compute the radius using image resolution
00126   double minDimen = (double) QMIN( editedImage->width(), editedImage->height() );  
00127   const int RADIUS = (int) QMAX( 2, (sqrt(minDimen)/4) );
00128   
00129   //iterate over image
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   //iterate over columns    
00141   for( editedImageX=0; editedImageX < editedImage->width(); editedImageX++)
00142   {
00143     //------------------
00144     //reset histogram object
00145     resetHistogram();
00146     //------------------
00147     //fill histogram with data that would have results from Y=-1
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         //get rgb value
00162         rgb = ((QRgb*)scanLine+clampedX);
00163         
00164         //update counts for this r/g/b value
00165         histogram.values[ qRed(*rgb)   ].r++;
00166         histogram.values[ qGreen(*rgb) ].g++;
00167         histogram.values[ qBlue(*rgb)   ].b++;        
00168       } //originalX
00169     } //originalY
00170     //------------------
00171 
00172     //now iterate over rows by simply removing trailing edge data and adding leading edge data
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         //remove trail edge data
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         //add leading edge data
00194         rgb = ((QRgb*)leadingScanLine+clampedX);
00195         histogram.values[ qRed(*rgb)   ].r++;
00196         histogram.values[ qGreen(*rgb) ].g++;
00197         histogram.values[ qBlue(*rgb)   ].b++;        
00198       } //originalX
00199 
00200       //find highest color counts
00201       findHighestCounts();
00202       
00203       //replace each color channel value with average of 
00204       //current value and most occuring value within neighborhood
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       //update status bar if significant progress has been made since last update
00213       if(useBusyIndicators)
00214       {
00215         newProgress++;
00216         if(newProgress >= updateIncrement)
00217         {
00218           newProgress = 0;
00219           status->incrementProgress();
00220           qApp->processEvents();  
00221         }
00222       }
00223       
00224     } //editedImageX
00225   } //editedImageY
00226   
00227   //return pointer to edited image
00228   return editedImage;  
00229 }


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