sepia.h File Reference

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Functions

QImage * sepiaEffect (QString filename, ManipulationOptions *options)


Function Documentation

QImage* sepiaEffect ( QString  filename,
ManipulationOptions options 
)

Definition at line 54 of file sepia.cpp.

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

Referenced by EditingInterface::applyEffect().

00055 {
00056   //load image
00057   QImage* editedImage = new QImage( filename );
00058   
00059   //convert to 32-bit depth if necessary
00060   if( editedImage->depth() < 32 )
00061   {
00062     QImage* tmp = editedImage;
00063     editedImage = new QImage( tmp->convertDepth( 32, Qt::AutoColor ) );
00064     delete tmp; tmp=NULL;
00065   }
00066 
00067   //determine if busy indicators will be used
00068   bool useBusyIndicators = false;
00069   StatusWidget* status = NULL;
00070   if( options != NULL && options->getStatus() != NULL )
00071   {
00072     useBusyIndicators = true;
00073     status = options->getStatus(); 
00074   }
00075   
00076   //setup progress bar
00077   if(useBusyIndicators)
00078   {
00079     QString statusMessage = qApp->translate( "sepiaEffect", "Applying Sepia Effect:" );
00080     status->showProgressBar( statusMessage, 100 );
00081     qApp->processEvents();  
00082   }
00083   
00084   //update progress bar for every 1% of completion
00085   const int updateIncrement = (int) ( 0.01 * editedImage->width() * editedImage->height() );
00086   int newProgress = 0; 
00087 
00088   //compute the hsl/hsv coordinates of sepia color
00089   int sepiaH, sepiaS, sepiaL;
00090   QColor(162,128,101).getHsv( &sepiaH, &sepiaS, &sepiaL );
00091   
00092   //iterate over each selected scanline 
00093   int x, y, pixelLuminance;
00094   QRgb* rgb;
00095   QColor sepiaColor;
00096   uchar* scanLine;
00097   
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       pixelLuminance = (int) (0.2125*qRed(*rgb) + 0.7154*qGreen(*rgb) + 0.0721*qBlue(*rgb));
00107       
00108       //compute and set sepia color
00109       sepiaColor.setHsv( sepiaH, sepiaS, pixelLuminance );      
00110       *rgb = sepiaColor.rgb();
00111       
00112       //update status bar if significant progress has been made since last update
00113       if(useBusyIndicators)
00114       {
00115         newProgress++;
00116         if(newProgress >= updateIncrement)
00117         {
00118           newProgress = 0;
00119           status->incrementProgress();
00120           qApp->processEvents();  
00121         }
00122       }
00123       
00124     }
00125   }
00126   
00127   //return pointer to edited image
00128   return editedImage;  
00129 }


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