/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1998 Dag-Erling Smørgrav
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/syslog.h>
#include <sys/consio.h>
#include <sys/fbio.h>

#include <dev/fb/fbreg.h>
#include <dev/fb/splashreg.h>
#include <dev/syscons/syscons.h>

#define SAVER_NAME	 "logo_saver"

#define SET_ORIGIN(adp, o) do {				\
	int oo = o;					\
	if (oo != last_origin)				\
	    vidd_set_win_org(adp, last_origin = oo);	\
	} while (0)

extern unsigned int	 logo_w;
extern unsigned int	 logo_h;
extern unsigned char	 logo_pal[];
extern unsigned char	 logo_img[];
extern unsigned int	 logo_img_size;

static u_char		*vid;
static int		 banksize, scrmode, bpsl, scrw, scrh;
static int		 blanked;

static void
logo_blit(video_adapter_t *adp, int x, int y)
{
	int d, l, o, p;
	int last_origin = -1;

	for (o = 0, p = y * bpsl + x; p > banksize; p -= banksize)
		o += banksize;
	SET_ORIGIN(adp, o);

	for (d = 0; d < logo_img_size; d += logo_w) {
		if (p + logo_w < banksize) {
			bcopy(logo_img + d, vid + p, logo_w);
			p += bpsl;
		} else if (p < banksize) {
			l = banksize - p;
			bcopy(logo_img + d, vid + p, l);
			SET_ORIGIN(adp, (o += banksize));
			bcopy(logo_img + d + l, vid, logo_w - l);
			p += bpsl - banksize;
		} else {
			p -= banksize;
			SET_ORIGIN(adp, (o += banksize));
			bcopy(logo_img + d, vid + p, logo_w);
			p += bpsl;
		}
	}
}

static void
logo_update(video_adapter_t *adp)
{
	static int xpos = 0, ypos = 0;
	static int xinc = 1, yinc = 1;

	/* Turn when you hit the edge */
	if ((xpos + logo_w + xinc > scrw) || (xpos + xinc < 0))
		xinc = -xinc;
	if ((ypos + logo_h + yinc > scrh) || (ypos + yinc < 0))
		yinc = -yinc;
	xpos += xinc;
	ypos += yinc;

	/* XXX Relies on margin around logo to erase trail */
	logo_blit(adp, xpos, ypos);
}

static int
logo_saver(video_adapter_t *adp, int blank)
{
	int pl;

	if (blank) {
		/* switch to graphics mode */
		if (blanked <= 0) {
			pl = splhigh();
			vidd_set_mode(adp, scrmode);
			vidd_load_palette(adp, logo_pal);
			vidd_set_border(adp, 0);
			blanked++;
			vid = (u_char *)adp->va_window;
			banksize = adp->va_window_size;
			bpsl = adp->va_line_width;
			splx(pl);
			vidd_clear(adp);
		}
		logo_update(adp);
	} else {
		blanked = 0;
	}
	return (0);
}

static int
logo_init(video_adapter_t *adp)
{
	video_info_t info;

	if (!vidd_get_info(adp, M_VESA_CG800x600, &info)) {
		scrmode = M_VESA_CG800x600;
	} else if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
		scrmode = M_VGA_CG320;
	} else {
		log(LOG_NOTICE,
		    "%s: the console does not support M_VGA_CG320\n",
		    SAVER_NAME);
		return (ENODEV);
	}

	scrw = info.vi_width;
	scrh = info.vi_height;

	return (0);
}

static int
logo_term(video_adapter_t *adp)
{
	return (0);
}

static scrn_saver_t logo_module = {
	SAVER_NAME,
	logo_init,
	logo_term,
	logo_saver,
	NULL
};

#ifdef BEASTIE_LOGO
SAVER_MODULE(beastie_saver, logo_module);
#else
SAVER_MODULE(logo_saver, logo_module);
#endif