#include <graphics.h>
void setfillpattern(char *upattern, int color);
 

setfillpattern is like setfillstyle, except that you use it to set a
user-defined 8x8 pattern rather than a predefined pattern.
upattern is a pointer to a sequence of 8 bytes, with each byte
corresponding to 8 pixels in the pattern. Whenever a bit in a pattern
byte is set to 1, the corresponding pixel is plotted.

/* setfillpattern example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
int main(void)
{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
   int maxx, maxy;
 
   /* a user-defined fill pattern */
   char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00};
 
   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");
 
   /* read result of initialization */
   errorcode = graphresult();
   if (errorcode != grOk)    /* an error occurred */
 
   {
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1);   /* terminate with an error code */
   }
 
   maxx = getmaxx();
   maxy = getmaxy();
   setcolor(getmaxcolor());
 
   /* select a user-defined fill pattern */
   setfillpattern(pattern, getmaxcolor());
 
   /* fill the screen with the pattern */
   bar(0, 0, maxx, maxy);
 
   /* clean up */
   getch();
   closegraph();
 
   return 0;
}

getfillpattern getfillsettings graphresult sector setfillstyle

  no output of example at the moment
  do not hesitate and add it...