Main Page | Namespace List | Class Hierarchy | Class List | Directories | File List | Class Members | File Members

emboss.h File Reference

This graph shows which files directly or indirectly include this file:

Included by dependency graph

Go to the source code of this file.

Functions

QImage * embossEffect (QString filename, StatusWidget *status)


Function Documentation

QImage* embossEffect QString  filename,
StatusWidget status
 

Definition at line 81 of file emboss.cpp.

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

Referenced by EditingInterface::applyEffect().

00082 {
00083   //load original image  
00084   QImage originalImage( filename );
00085 
00086   //create edited image
00087   QImage* editedImage = new QImage( filename );
00088   
00089   //determine if busy indicators will be used
00090   bool useBusyIndicators = (status != NULL);
00091   
00092   //setup progress bar
00093   if(useBusyIndicators)
00094   {
00095     QString statusMessage = qApp->translate( "embossEffect", "Applying Emboss Effect:" );
00096     status->showProgressBar( statusMessage, 100 );
00097     qApp->processEvents();  
00098   }
00099   
00100   //update progress bar for every 1% of completion
00101   const int updateIncrement = (int) ( 0.01 * originalImage.width() * originalImage.height() );
00102   int newProgress = 0; 
00103 
00104   //iterate over each selected scanline 
00105   int x, y;
00106   QRgb* rgb;
00107   uchar* scanLine;
00108 
00109   int yPrev, yNext, xPrev, xNext;
00110   
00111   //compute the radius using image resolution
00112   double minDimen = (double) QMIN( editedImage->width(), editedImage->height() );  
00113   const int embossRadius = (int) QMAX( 1, (sqrt(minDimen)/8) );
00114   
00115   for( y=0; y<editedImage->height(); y++)
00116   {   
00117     scanLine = originalImage.scanLine(y);
00118 
00119     //compute previous and next y pixel coordinates
00120     yPrev = QMAX( y-embossRadius, 0 );
00121     yNext = QMIN( y+embossRadius, editedImage->height() - 1 );
00122     
00123     //iterate over each selected pixel in scanline
00124     for( x=0; x<editedImage->width(); x++)
00125     {
00126       //compute previous and next x  pixel coordinates
00127       xPrev = QMAX( x-embossRadius, 0 );
00128       xNext = QMIN( x+embossRadius, editedImage->width() - 1 );
00129 
00130       //start with a default luminance of 128 (50% luminance)
00131       int sum = 128;
00132       
00133       //sum weighted gray values of neighbors
00134       scanLine = originalImage.scanLine( yPrev );
00135       sum-= qGray( *((QRgb*)scanLine + xPrev ) );
00136       sum-= qGray( *((QRgb*)scanLine + x ) );
00137 
00138       scanLine = originalImage.scanLine( y );
00139       sum-= qGray( *((QRgb*)scanLine + xPrev ) );
00140       sum+= qGray( *((QRgb*)scanLine + xNext ) );
00141 
00142       scanLine = originalImage.scanLine( yNext );
00143       sum+= qGray( *((QRgb*)scanLine + x ) );
00144       sum+= qGray( *((QRgb*)scanLine + xNext ) );
00145       
00146       //clamp sum to within 0-255 range
00147       sum = QMAX( QMIN( sum, 255), 0 );
00148 
00149       //get original pixel color in HSV space
00150       scanLine = editedImage->scanLine(y);            
00151       rgb = ((QRgb*)scanLine+x);
00152       double r = ((double)qRed(*rgb)   )/255.0;
00153       double g = ((double)qGreen(*rgb) )/255.0;
00154       double b = ((double)qBlue(*rgb)  )/255.0;
00155       
00156       //convert to hsv
00157       double h,s,v;
00158       RGBtoHSV(r,g,b,&h,&s,&v);
00159       
00160       //reset v
00161       v = ((double)sum)/255;
00162       
00163       //convert adjusted color back to rgb colorspace and clamp
00164       HSVtoRGB( &r,&g,&b, h,s,v);         
00165       int rp = (int) QMIN( QMAX((r*255), 0), 255 );
00166       int gp = (int) QMIN( QMAX((g*255), 0), 255 );
00167       int bp = (int) QMIN( QMAX((b*255), 0), 255 );
00168       
00169       //set adjusted color value
00170       *rgb = qRgb(rp,gp,bp);
00171       
00172       //update status bar if significant progress has been made since last update
00173       if(useBusyIndicators)
00174       {
00175         newProgress++;
00176         if(newProgress >= updateIncrement)
00177         {
00178           newProgress = 0;
00179           status->incrementProgress();
00180           qApp->processEvents();  
00181         }
00182       }
00183       
00184     }
00185   }
00186   
00187   //return pointer to edited image
00188   return editedImage;  
00189 }


Generated on Sat Apr 2 05:44:16 2005 for AlbumShaper by  doxygen 1.3.9.1