AlbumShaper  1.0a3
Functions
blackWhite.cpp File Reference
#include <qimage.h>
#include <qstring.h>
#include <qapplication.h>
#include "blackWhite.h"
#include "manipulationOptions.h"
#include "../../gui/statusWidget.h"
Include dependency graph for blackWhite.cpp:

Go to the source code of this file.

Functions

QImage * blackWhiteEffect (QString filename, ManipulationOptions *options)
 

Function Documentation

§ blackWhiteEffect()

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().

61 {
62  //load image
63  QImage* editedImage = new QImage( filename );
64 
65  //convert to 32-bit depth if necessary
66  if( editedImage->depth() < 32 )
67  {
68  QImage* tmp = editedImage;
69  editedImage = new QImage( tmp->convertDepth( 32, Qt::AutoColor ) );
70  delete tmp; tmp=NULL;
71  }
72 
73  //determine if busy indicators will be used
74  bool useBusyIndicators = false;
75  StatusWidget* status = NULL;
76  if( options != NULL && options->getStatus() != NULL )
77  {
78  useBusyIndicators = true;
79  status = options->getStatus();
80  }
81 
82  //setup progress bar
83  if(useBusyIndicators)
84  {
85  QString statusMessage = qApp->translate( "blackWhiteEffect", "Applying Black + White Effect:" );
86  status->showProgressBar( statusMessage, 100 );
87  qApp->processEvents();
88  }
89 
90  //update progress bar for every 1% of completion
91  const int updateIncrement = (int) ( 0.01 * editedImage->width() * editedImage->height() );
92  int newProgress = 0;
93 
94  //iterate over each selected scanline
95  int x, y, grayValue;
96  QRgb* rgb;
97  uchar* scanLine;
98  for( y=0; y<editedImage->height(); y++)
99  {
100  //iterate over each selected pixel in scanline
101  scanLine = editedImage->scanLine(y);
102  for( x=0; x<editedImage->width(); x++)
103  {
104  //compute gray value based on the display luminance of color coordinates
105  rgb = ((QRgb*)scanLine+x);
106  grayValue = (int) (0.2125*qRed(*rgb) + 0.7154*qGreen(*rgb) + 0.0721*qBlue(*rgb));
107 
108  //clamp to ensure it falls in the 0-255 range
109  grayValue = QMIN( QMAX( grayValue, 0 ), 255 );
110 
111  //set pixel channel values using computed gray value
112  *rgb = qRgb( grayValue, grayValue, grayValue );
113 
114  //update status bar if significant progress has been made since last update
115  if(useBusyIndicators)
116  {
117  newProgress++;
118  if(newProgress >= updateIncrement)
119  {
120  newProgress = 0;
121  status->incrementProgress();
122  qApp->processEvents();
123  }
124  }
125 
126  }
127  }
128 
129  //return pointer to edited image
130  return editedImage;
131 }
int updateIncrement
StatusWidget * getStatus()
void incrementProgress()
Updates the progress bar by one step.
void showProgressBar(QString message, int numSteps)
Initializes the progress bar.
StatusWidget * status
QImage * editedImage
int newProgress