blackWhite.h File Reference

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Functions

QImage * blackWhiteEffect (QString filename, ManipulationOptions *options)


Function Documentation

QImage* blackWhiteEffect ( QString  filename,
ManipulationOptions options 
)

Definition at line 60 of file blackWhite.cpp.

References editedImage, ManipulationOptions::getStatus(), StatusWidget::incrementProgress(), newProgress, StatusWidget::showProgressBar(), status, and updateIncrement.

Referenced by EditingInterface::applyEffect(), and pointillismEffect().

00061 {
00062   //load image
00063   QImage* editedImage = new QImage( filename );
00064   
00065   //convert to 32-bit depth if necessary
00066   if( editedImage->depth() < 32 )
00067   {
00068     QImage* tmp = editedImage;
00069     editedImage = new QImage( tmp->convertDepth( 32, Qt::AutoColor ) );
00070     delete tmp; tmp=NULL;
00071   }
00072   
00073   //determine if busy indicators will be used
00074   bool useBusyIndicators = false;
00075   StatusWidget* status = NULL;
00076   if( options != NULL && options->getStatus() != NULL )
00077   {
00078     useBusyIndicators = true;
00079     status = options->getStatus(); 
00080   }
00081   
00082   //setup progress bar
00083   if(useBusyIndicators)
00084   {
00085     QString statusMessage = qApp->translate( "blackWhiteEffect", "Applying Black + White Effect:" );
00086     status->showProgressBar( statusMessage, 100 );
00087     qApp->processEvents();  
00088   }
00089   
00090   //update progress bar for every 1% of completion
00091   const int updateIncrement = (int) ( 0.01 * editedImage->width() * editedImage->height() );
00092   int newProgress = 0; 
00093 
00094   //iterate over each selected scanline 
00095   int x, y, grayValue;
00096   QRgb* rgb;
00097   uchar* scanLine;
00098   for( y=0; y<editedImage->height(); y++)
00099   {   
00100     //iterate over each selected pixel in scanline
00101     scanLine = editedImage->scanLine(y);
00102     for( x=0; x<editedImage->width(); x++)
00103     {
00104       //compute gray value based on the display luminance of color coordinates
00105       rgb = ((QRgb*)scanLine+x);
00106       grayValue = (int) (0.2125*qRed(*rgb) + 0.7154*qGreen(*rgb) + 0.0721*qBlue(*rgb));
00107       
00108       //clamp to ensure it falls in the 0-255 range
00109       grayValue = QMIN( QMAX( grayValue, 0 ), 255 );      
00110       
00111       //set pixel channel values using computed gray value
00112       *rgb = qRgb( grayValue, grayValue, grayValue );      
00113 
00114       //update status bar if significant progress has been made since last update
00115       if(useBusyIndicators)
00116       {
00117         newProgress++;
00118         if(newProgress >= updateIncrement)
00119         {
00120           newProgress = 0;
00121           status->incrementProgress();
00122           qApp->processEvents();  
00123         }
00124       }
00125 
00126     }
00127   }
00128    
00129   //return pointer to edited image
00130   return editedImage;  
00131 }


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