dynamic pixmap

#include <cstdio>
#include <cstdlib>
#include <conio.h>
#include <iostream>


class pixmap
{
private:
    char _cols;
    int _width, _height;
    char **pix_m;
public:
    pixmap(int , int);
    uint8_t getpixel(int, int);
    void printl(int);

};

pixmap::pixmap(int width, int height)
{
    _width = width;
    _height = height;
    _cols = width/8+1;

    pix_m = (char**) (calloc(height,_cols));
    for (int x =0 ; x < _cols; x++)
    {
           pix_m[x] = (char*)calloc(_cols,sizeof(char*));
    }

    printf("%d\r\n",_cols);
}

void pixmap::printl(int y)
{
    int pix;
    for (int i = 0; i < _cols-1; i++)
    {
        for (int x= 0; x<8; x++)
        {
            pix = pix_m[y][i]&(0x01<<(7-x));
            printf("%d",pix!=0);
        }
    }
    int q = _width - (_cols-1)*8;
    for (int x= 0; x<q; x++)
    {
        pix = pix_m[y][_cols-1]&(0x01<<(7-x));
        printf("%d",pix!=0);
    }
}
/*
uint8_t imaq::getpixel(int x , int y)
{
    uint8_t q = (x)/8;
    uint8_t mask = 0x80 >> x%8;
    return((pix_x[q]& mask)!=0);
}*/



int main()
{
    pixmap img(50,100);
    img.printl(1);

    printf("\r\n");
    /*for (int i=0 ; i <50; i++)
    {
        printf("%d",img.getpixel(i,0));
    }*/

    getch();
}