#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) |
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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(). 00061 {
00062 //load image
00063 QImage* editedImage = new QImage( filename );
00064
00065 //convert to 32-bit depth if necessary
00066 if( editedImage->depth() < 32 )
00067 {
00068 QImage* tmp = editedImage;
00069 editedImage = new QImage( tmp->convertDepth( 32, Qt::AutoColor ) );
00070 delete tmp; tmp=NULL;
00071 }
00072
00073 //determine if busy indicators will be used
00074 bool useBusyIndicators = false;
00075 StatusWidget* status = NULL;
00076 if( options != NULL && options->getStatus() != NULL )
00077 {
00078 useBusyIndicators = true;
00079 status = options->getStatus();
00080 }
00081
00082 //setup progress bar
00083 if(useBusyIndicators)
00084 {
00085 QString statusMessage = qApp->translate( "blackWhiteEffect", "Applying Black + White Effect:" );
00086 status->showProgressBar( statusMessage, 100 );
00087 qApp->processEvents();
00088 }
00089
00090 //update progress bar for every 1% of completion
00091 const int updateIncrement = (int) ( 0.01 * editedImage->width() * editedImage->height() );
00092 int newProgress = 0;
00093
00094 //iterate over each selected scanline
00095 int x, y, grayValue;
00096 QRgb* rgb;
00097 uchar* scanLine;
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 grayValue = (int) (0.2125*qRed(*rgb) + 0.7154*qGreen(*rgb) + 0.0721*qBlue(*rgb));
00107
00108 //clamp to ensure it falls in the 0-255 range
00109 grayValue = QMIN( QMAX( grayValue, 0 ), 255 );
00110
00111 //set pixel channel values using computed gray value
00112 *rgb = qRgb( grayValue, grayValue, grayValue );
00113
00114 //update status bar if significant progress has been made since last update
00115 if(useBusyIndicators)
00116 {
00117 newProgress++;
00118 if(newProgress >= updateIncrement)
00119 {
00120 newProgress = 0;
00121 status->incrementProgress();
00122 qApp->processEvents();
00123 }
00124 }
00125
00126 }
00127 }
00128
00129 //return pointer to edited image
00130 return editedImage;
00131 }
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1.3.9.1