#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>extern void fb_display(unsigned char *, int, int, int, int, int, int);extern int openFB(const char *name);extern void closeFB(int fh);extern char *dev;#define X_BUFFER	(300)#define Y_BUFFER	(200)int main(void){    float i,j;    unsigned char *buffer;    buffer = (unsigned char *) malloc(X_BUFFER * Y_BUFFER * 3 * sizeof(unsigned char));    for(j=0.0; j<Y_BUFFER; j++) for(i=0.0; i<X_BUFFER; i++){	buffer[(int)((i+j*X_BUFFER)*3)] = (unsigned char)((float)i * (float)256.0 / (float)X_BUFFER);	buffer[(int)((i+j*X_BUFFER)*3+1)] = (unsigned char)((float)(X_BUFFER-i) * (float)256.0 / (float)X_BUFFER);	buffer[(int)((i+j*X_BUFFER)*3+2)] = (unsigned char)((float)j * (float)256.0 / (float)Y_BUFFER);    }    fb_display(buffer, X_BUFFER, Y_BUFFER, 0, 0, 10, 10);    free(buffer);    return 0;}