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Get rid of the PANE_HIDDEN flag in favour of a function, and moving the
decision for whether or not a pane should be drawn out of the layout code and
into the redraw code.

This is needed for the new layout design, getting it in now to make that easier
to work on.

/* $OpenBSD: screen-redraw.c,v 1.3 2009/07/14 07:23:36 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <string.h>

#include "tmux.h"

int	screen_redraw_check_cell(struct client *, u_int, u_int);

/* Check if cell inside a pane. */
int
screen_redraw_check_cell(struct client *c, u_int px, u_int py)
{
	struct window		*w = c->session->curw->window;
	struct window_pane	*wp;

	if (px > w->sx || py > w->sy)
		return (0);

	TAILQ_FOREACH(wp, &w->panes, entry) {
		if (!window_pane_visible(wp))
			continue;

		/* Inside pane. */
		if (px >= wp->xoff && px < wp->xoff + wp->sx &&
		    py >= wp->yoff && py < wp->yoff + wp->sy)
			return (1);

		/* Left/right borders. */
		if (py >= wp->yoff && py < wp->yoff + wp->sy) {
			if (wp->xoff != 0 && px == wp->xoff - 1)
				return (1);
			if (px == wp->xoff + wp->sx)
				return (1);
		}

		/* Top/bottom borders. */
		if (px >= wp->xoff && px < wp->xoff + wp->sx) {
			if (wp->yoff != 0 && py == wp->yoff - 1)
				return (1);
			if (py == wp->yoff + wp->sy)
				return (1);
		}
	}

	return (0);
}

/* Redraw entire screen.. */
void
screen_redraw_screen(struct client *c)
{
	struct window		*w = c->session->curw->window;
	struct tty		*tty = &c->tty;
	struct window_pane	*wp;
	u_int		 	 i, j, sx, sy;
	int		 	 status, has_acs;
	u_char			 choriz, cvert, cbackg;

	/* Get status line, er, status. */
	status = options_get_number(&c->session->options, "status");

	/* Work out ACS characters. */
	if (tty_term_has(tty->term, TTYC_ACSC)) {
		has_acs = 1;
		choriz = tty_get_acs(tty, 'q');
		cvert = tty_get_acs(tty, 'x');
		cbackg = tty_get_acs(tty, '~');
	} else {
		has_acs = 0;
		choriz = '-';
		cvert = '|';
		cbackg = '.';
	}

	/* Clear the screen. */
	tty_reset(tty);
	if (has_acs)
		tty_putcode(tty, TTYC_SMACS);
	for (j = 0; j < tty->sy - status; j++) {
		for (i = 0; i < tty->sx; i++) {
			if (!screen_redraw_check_cell(c, i, j)) {
				tty_cursor(tty, i, j, 0, 0);
				tty_putc(tty, cbackg);
			}
		}
	}
	if (has_acs)
		tty_putcode(tty, TTYC_RMACS);

	/* Draw the panes. */
	TAILQ_FOREACH(wp, &w->panes, entry) {
		if (!window_pane_visible(wp))
			continue;

		tty_reset(tty);

		sx = wp->sx;
		sy = wp->sy;

		/* Draw left and right borders. */
		if (has_acs)
			tty_putcode(tty, TTYC_SMACS);
		if (wp->xoff > 0) {
			for (i = wp->yoff; i < wp->yoff + sy; i++) {
				tty_cursor(tty, wp->xoff - 1, i, 0, 0);
				tty_putc(tty, cvert);
			}
		}
		if (wp->xoff + sx < tty->sx) {
			for (i = wp->yoff; i < wp->yoff + sy; i++) {
				tty_cursor(tty, wp->xoff + sx, i, 0, 0);
				tty_putc(&c->tty, cvert);
			}
		}

		/* Draw top and bottom borders. */
		if (wp->yoff > 0) {
			tty_cursor(tty, wp->xoff, wp->yoff - 1, 0, 0);
			for (i = 0; i < sx; i++)
				tty_putc(tty, choriz);
		}
		if (wp->yoff + sy < tty->sy - status) {
			tty_cursor(tty, wp->xoff, wp->yoff + sy, 0, 0);
			for (i = 0; i < sx; i++)
				tty_putc(tty, choriz);
		}
		if (has_acs)
			tty_putcode(tty, TTYC_RMACS);

		/* Draw the pane. */
		screen_redraw_pane(c, wp);
	}

	/* Draw the status line. */
	screen_redraw_status(c);
}

/* Draw a single pane. */
void
screen_redraw_pane(struct client *c, struct window_pane *wp)
{
	u_int	i;

	for (i = 0; i < wp->sy; i++)
		tty_draw_line(&c->tty, wp->screen, i, wp->xoff, wp->yoff);
}


/* Draw the status line. */
void
screen_redraw_status(struct client *c)
{
	tty_draw_line(&c->tty, &c->status, 0, 0, c->tty.sy - 1);
}