File content as of revision 2:28ca549860f6:

#include "PixelArray.h"

PixelArray::PixelArray(int size)
{
    pbufsize = size;
    pbuf = new int[pbufsize];
    SetAll(0x0); // initialise memory to zeros
    
}

PixelArray::~PixelArray()
{
    delete[] pbuf;
}

void PixelArray::SetAll(unsigned int value)
{
    // for each pixel
    for (int i=0 ; i < pbufsize; i++) {
        __set_pixel(i,value);
    }
}


void PixelArray::SetAllI(unsigned char value)
{
    // for each pixel
    for (int i=0 ; i < pbufsize; i++) {
        __set_pixel_component(i,3,value);
    }
}



void PixelArray::SetAllR(unsigned char value)
{
    // for each pixel
    for (int i=0 ; i < pbufsize; i++) {
        __set_pixel_component(i,2,value);
    }
}

void PixelArray::SetAllG(unsigned char value)
{
    // for each pixel
    for (int i=0 ; i < pbufsize; i++) {
        __set_pixel_component(i,1,value);
    }
}

void PixelArray::SetAllB(unsigned char value)
{
    // for each pixel
    for (int i=0 ; i < pbufsize; i++) {
        __set_pixel_component(i,0,value);
    }
}





void PixelArray::Set(int i, unsigned int value)
{
    if ((i >= 0) && (i < pbufsize)) {
        __set_pixel(i,value);
    }
}



void PixelArray::SetI(int i, unsigned char value)
{
    if ((i >= 0) && (i < pbufsize)) {
        __set_pixel_component(i,3,value);
    }
}


void PixelArray::SetR(int i, unsigned char value)
{
    if ((i >= 0) && (i < pbufsize)) {
        __set_pixel_component(i,2,value);
    }
}

void PixelArray::SetG(int i, unsigned char value)
{
    if ((i >= 0) && (i < pbufsize)) {
        __set_pixel_component(i,1,value);
    }
}

void PixelArray::SetB(int i, unsigned char value)
{
    if ((i >= 0) && (i < pbufsize)) {
        __set_pixel_component(i,0,value);
    }
}


unsigned int  PixelArray::Get(int i)
{
         return __get_pixel(i);
}

unsigned int  PixelArray::GetI(int i)
{
         return __get_pixel_component(i,3);
}

unsigned int  PixelArray::GetR(int i)
{
         return __get_pixel_component(i,2);
}

unsigned int  PixelArray::GetG(int i)
{
         return __get_pixel_component(i,1);
}

unsigned int  PixelArray::GetB(int i)
{
         return __get_pixel_component(i,0);
}



int* PixelArray::getBuf()
{
    return (pbuf);
}


// set either the I,R,G,B value of specific pixel channel
void PixelArray::__set_pixel_component(int index, int channel, int value)
{

    // AND with 0x00 shifted to the right location to clear the bits
    pbuf[index] &= ~(0xFF << (8 * channel));

    // Set the bits with an OR
    pbuf[index] |= (value << (8 * channel));
}


// set either the I,R,G,B value of specific pixel channel
void PixelArray::__set_pixel(int index, int value)
{
    // AND with 0x00 shifted to the right location to clear the bits
    pbuf[index] = value;
}


// get specific pixel
int  PixelArray::__get_pixel(int index)
{
    if ((index >= 0) && (index < pbufsize)) {
        return pbuf[index];
    } else {
        return 0;
    }
}


// get specific pixel
int  PixelArray::__get_pixel_component(int index, int channel)
{
    // AND with 0xFF shifted to the right location to get the bits
    return ( (__get_pixel(index) & (0xFF << (8 * channel))) >> (8*channel) );
}