Window flicker test case

nctest.c

#include <stdlib.h>
#include <curses.h>

int
main(void)
{
	WINDOW			*lwin;	/* large window */
	WINDOW			*bwin;	/* bar window */
	WINDOW			*owin;	/* other window - overlaps largewin */
	int			 i = 0;

	initscr();

	/* make wins */
	if ((lwin = newwin(LINES - 1, COLS, 0, 0)) == NULL)
		fprintf(stderr, "lwin newwin fail\n");

	if ((bwin = newwin(1, COLS, LINES - 1, 0)) == NULL)
		fprintf(stderr, "lwin newwin fail\n");

	if ((owin = newwin(10, 10, 10, 10)) == NULL)
		fprintf(stderr, "owin newwin fail\n");

	/* colours */
	if (start_color() == ERR)
		fprintf(stderr, "Could not initialise colour terminal");

	init_pair(1, COLOR_YELLOW, COLOR_BLUE);
	init_pair(2, COLOR_YELLOW, COLOR_RED);
	init_pair(3, COLOR_YELLOW, COLOR_GREEN);

	wbkgd(lwin, COLOR_PAIR(1));
	wbkgd(bwin, COLOR_PAIR(2));
	wbkgd(owin, COLOR_PAIR(3));

	/* put some text in */
	wprintw(lwin, "Large window");
	wprintw(bwin, "Bar window");
	wprintw(owin, "Other window");

	wrefresh(lwin);
	wrefresh(bwin);
	wrefresh(owin);

	/* pause until a keypress */
	wgetch(lwin);

	wclear(bwin);
	for (i = 0; i < COLS; i ++) {
		wclear(bwin); /* offending function call - makes whole screen update */
		wprintw(bwin, "*");
		wrefresh(bwin);
		redrawwin(bwin);
		usleep(100);
	}

	/* pause until a keypress */
	wgetch(lwin);

	delwin(lwin);
	delwin(bwin);
	delwin(owin);

	if (endwin() != OK)
		fprintf(stderr, "fail");

	return (EXIT_SUCCESS);
}