#include <qimage.h>
#include <qstring.h>
#include <qapplication.h>
#include "blackWhite.h"
#include "../../gui/statusWidget.h"
Include dependency graph for blackWhite.cpp:
Go to the source code of this file.
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QImage * | blackWhiteEffect (QString filename, StatusWidget *status) |
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Definition at line 51 of file blackWhite.cpp. References editedImage, StatusWidget::incrementProgress(), newProgress, StatusWidget::showProgressBar(), status, and updateIncrement. Referenced by EditingInterface::applyEffect(), and pointillismEffect(). 00052 { 00053 //load image 00054 QImage* editedImage = new QImage( filename ); 00055 00056 //determine if busy indicators will be used 00057 bool useBusyIndicators = (status != NULL); 00058 00059 //setup progress bar 00060 if(useBusyIndicators) 00061 { 00062 QString statusMessage = qApp->translate( "blackWhiteEffect", "Applying Black + White Effect:" ); 00063 status->showProgressBar( statusMessage, 100 ); 00064 qApp->processEvents(); 00065 } 00066 00067 //update progress bar for every 1% of completion 00068 const int updateIncrement = (int) ( 0.01 * editedImage->width() * editedImage->height() ); 00069 int newProgress = 0; 00070 00071 //iterate over each selected scanline 00072 int x, y, grayValue; 00073 QRgb* rgb; 00074 uchar* scanLine; 00075 for( y=0; y<editedImage->height(); y++) 00076 { 00077 //iterate over each selected pixel in scanline 00078 scanLine = editedImage->scanLine(y); 00079 for( x=0; x<editedImage->width(); x++) 00080 { 00081 //compute gray value based on the display luminance of color coordinates 00082 rgb = ((QRgb*)scanLine+x); 00083 grayValue = (int) (0.3*qRed(*rgb) + 0.59*qGreen(*rgb) + 0.11*qBlue(*rgb)); 00084 00085 //clamp to ensure it falls in the 0-255 range 00086 grayValue = QMIN( QMAX( grayValue, 0 ), 255 ); 00087 00088 //set pixel channel values using computed gray value 00089 *rgb = qRgb( grayValue, grayValue, grayValue ); 00090 00091 //update status bar if significant progress has been made since last update 00092 if(useBusyIndicators) 00093 { 00094 newProgress++; 00095 if(newProgress >= updateIncrement) 00096 { 00097 newProgress = 0; 00098 status->incrementProgress(); 00099 qApp->processEvents(); 00100 } 00101 } 00102 00103 } 00104 } 00105 00106 //return pointer to edited image 00107 return editedImage; 00108 }
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