---

RandomSource.cpp

Go to the documentation of this file.

/**************************************************************************
 *
 * Source code for Real Time Image Library (libRTImage)
 *
 * Leeds Vision Group give permission for this code to be copied, modified 
 * and distributed within the University of Leeds subject to the following 
 * conditions:-
 *
 * - The code is not to be used for commercial gain.
 * - The code and use thereof will be attributed to the author where
 *   appropriate (inluding demonstrations which rely on it's use).
 * - All modified, distributions of the source files will retain this header.
 *
 ****************************************************************************/
 
#include <time.h>       // time()
#include <unistd.h>     // usleep()
#include <stdlib.h>     // rand()

#include "RandomSource.h"


RandomSource::RandomSource(unsigned int w, unsigned int h, unsigned int fps)
{
        // initialise random sunber generator
        srand(time(NULL));
        sleeptime = 1000000 / fps;

        // default palette for this ImageSource is colour
        type      = Image::COLOUR;
}


ImageSource& RandomSource::operator >> (ImageRGB& img) 
{
        update(img);
        usleep(sleeptime);
        
        return *this;
}


ImageSource& RandomSource::operator >> (ImageGrey& img) 
{
        update(img);
        usleep(sleeptime);
        
        return *this;
}


ImageSource& RandomSource::operator >> (Image& img) 
{
        (type == Image::COLOUR) ? update((ImageRGB&)  img) 
                                : update((ImageGrey&) img);
        usleep(sleeptime);
        
        return *this;
}


void RandomSource::update(ImageRGB& img)
{
        int *d = img.data[0];
        unsigned int size = img.get_width() * img.get_height();
        
        // generate random values
        int r = rand() % 255;
        int g = rand() % 255;
        int b = rand() % 255;

        // set all the pixels in the Image
        for (unsigned int i = 0; i < size; i++, d+=3) {
                        *d     = r;
                        *(d+1) = g;
                        *(d+2) = b;
        }
}


void RandomSource::update(ImageGrey& img)
{
        int *d = img.brightness;
        unsigned int size = img.get_width() * img.get_height();
        
        // generate the random value
        int b = rand() % 255;

        // set all the pixels in the image
        for (unsigned int i = 0; i < size; i++, d++) *d = b;
}

---