emboss.h File Reference

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Functions
QImage *	embossEffect (QString filename, ManipulationOptions *options)

Function Documentation

embossEffect()

QImage * embossEffect	(	QString	filename,
		ManipulationOptions *	options )

Definition at line 85 of file emboss.cpp.

{
  //load original image  
  QImage originalImage( filename );
 
  //convert to 32-bit depth if necessary
  if( originalImage.depth() < 32 ) { originalImage = originalImage.convertDepth( 32, Qt::AutoColor ); }
  
  //create edited image
  QImage* editedImage = new QImage( filename );
 
  //convert to 32-bit depth if necessary
  if( editedImage->depth() < 32 )
  {
    QImage* tmp = editedImage;
    editedImage = new QImage( tmp->convertDepth( 32, Qt::AutoColor ) );
    delete tmp; tmp=NULL;
  }
  
  //determine if busy indicators will be used
  bool useBusyIndicators = false;
  StatusWidget* status = NULL;
  if( options != NULL && options->getStatus() != NULL )
  {
    useBusyIndicators = true;
    status = options->getStatus(); 
  }
  
  //setup progress bar
  if(useBusyIndicators)
  {
    QString statusMessage = qApp->translate( "embossEffect", "Applying Emboss Effect:" );
    status->showProgressBar( statusMessage, 100 );
    qApp->processEvents();  
  }
  
  //update progress bar for every 1% of completion
  const int updateIncrement = (int) ( 0.01 * originalImage.width() * originalImage.height() );
  int newProgress = 0; 
 
  //iterate over each selected scanline 
  int x, y;
  QRgb* rgb;
  uchar* scanLine;
 
  int yPrev, yNext, xPrev, xNext;
  
  //compute the radius using image resolution
  double minDimen = (double) MIN( editedImage->width(), editedImage->height() );  
  const int embossRadius = (int) MAX( 1, (sqrt(minDimen)/8) );
  
  for( y=0; y<editedImage->height(); y++)
  {   
    scanLine = originalImage.scanLine(y);
 
    //compute previous and next y pixel coordinates
    yPrev = MAX( y-embossRadius, 0 );
    yNext = MIN( y+embossRadius, editedImage->height() - 1 );
    
    //iterate over each selected pixel in scanline
    for( x=0; x<editedImage->width(); x++)
    {
      //compute previous and next x  pixel coordinates
      xPrev = MAX( x-embossRadius, 0 );
      xNext = MIN( x+embossRadius, editedImage->width() - 1 );
 
      //start with a default luminance of 128 (50% luminance)
      int sum = 128;
      
      //sum weighted gray values of neighbors
      scanLine = originalImage.scanLine( yPrev );
      sum-= qGray( *((QRgb*)scanLine + xPrev ) );
      sum-= qGray( *((QRgb*)scanLine + x ) );
 
      scanLine = originalImage.scanLine( y );
      sum-= qGray( *((QRgb*)scanLine + xPrev ) );
      sum+= qGray( *((QRgb*)scanLine + xNext ) );
 
      scanLine = originalImage.scanLine( yNext );
      sum+= qGray( *((QRgb*)scanLine + x ) );
      sum+= qGray( *((QRgb*)scanLine + xNext ) );
      
      //clamp sum to within 0-255 range
      sum = MAX( MIN( sum, 255), 0 );
 
      //get original pixel color in HSV space
      scanLine = editedImage->scanLine(y);            
      rgb = ((QRgb*)scanLine+x);
      double r = ((double)qRed(*rgb)   )/255.0;
      double g = ((double)qGreen(*rgb) )/255.0;
      double b = ((double)qBlue(*rgb)  )/255.0;
      
      //convert to hsv
      double h,s,v;
      RGBtoHSV(r,g,b,&h,&s,&v);
      
      //reset v
      v = ((double)sum)/255;
      
      //convert adjusted color back to rgb colorspace and clamp
      HSVtoRGB( &r,&g,&b, h,s,v);         
      int rp = (int) MIN( MAX((r*255), 0), 255 );
      int gp = (int) MIN( MAX((g*255), 0), 255 );
      int bp = (int) MIN( MAX((b*255), 0), 255 );
      
      //set adjusted color value
      *rgb = qRgb(rp,gp,bp);
      
      //update status bar if significant progress has been made since last update
      if(useBusyIndicators)
      {
        newProgress++;
        if(newProgress >= updateIncrement)
        {
          newProgress = 0;
          status->incrementProgress();
          qApp->processEvents();  
        }
      }
      
    }
  }
  
  //return pointer to edited image
  return editedImage;  
}

References b, editedImage, ManipulationOptions::getStatus(), HSVtoRGB(), StatusWidget::incrementProgress(), MAX, MIN, newProgress, RGBtoHSV(), StatusWidget::showProgressBar(), status, and updateIncrement.

Referenced by EditingInterface::applyEffect().