/*-
 * Copyright (c) 2015 Conrad Meyer <cem@FreeBSD.org>
 * 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.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/callout.h>
#include <sys/cons.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/mutex.h>
#include <sys/smp.h>
#include <sys/systm.h>
#include <sys/terminal.h>

#include <dev/vt/vt.h>

extern const unsigned char vt_beastie_vga16[];
extern const unsigned char vt_beastie2_vga16[];
extern const unsigned char vt_orb_vga16[];

static struct timeout_task vt_splash_cpu_fini_task;

static inline unsigned char
vt_vga2bsd(unsigned char vga)
{
        static const unsigned char lut[8] = {
                0,
                4,      /* 1 and 4 swap */
                2,
                6,      /* 3 and 6 swap */
                1,      /* 4 and 1 swap */
                5,
                3,      /* 6 and 3 swap */
                7,
        };
        unsigned int bright;

        bright = (vga & 0x8);
        return (lut[vga & 0x7] | bright);
}

static void
vt_draw_2_vga16_px(struct vt_device *vd, vt_axis_t x, vt_axis_t y,
    unsigned char color)
{

        vd->vd_driver->vd_setpixel(vd, x, y, vt_vga2bsd(color >> 4));
        vd->vd_driver->vd_setpixel(vd, x + 1, y, vt_vga2bsd(color & 0xf));
}

static void
vt_draw_1_logo(struct vt_device *vd, vt_axis_t top, vt_axis_t left)
{
        const unsigned char rle_sent = 0x16, *data;
        unsigned int xy, run, runcolor, i;

        switch (vt_splash_cpu_style) {
        case VT_LOGOS_DRAW_ALT_BEASTIE:
                data = vt_beastie2_vga16;
                break;
        case VT_LOGOS_DRAW_ORB:
                data = vt_orb_vga16;
                break;
        case VT_LOGOS_DRAW_BEASTIE:
                /* FALLTHROUGH */
        default:
                data = vt_beastie_vga16;
                break;
        }

        /* Decode basic RLE (gets us to 30-40% of uncompressed data size): */
        for (i = 0, xy = 0; xy < vt_logo_sprite_height * vt_logo_sprite_width;) {
                if (data[i] == rle_sent) {
                        runcolor = data[i + 1];
                        run = data[i + 2];

                        for (; run; run--, xy += 2)
                                vt_draw_2_vga16_px(vd,
                                    left + (xy % vt_logo_sprite_width),
                                    top + (xy / vt_logo_sprite_width),
                                    runcolor);

                        i += 3;
                } else {
                        vt_draw_2_vga16_px(vd, left + (xy % vt_logo_sprite_width),
                            top + (xy / vt_logo_sprite_width), data[i]);

                        i++;
                        xy += 2;
                }
        }
}

void
vtterm_draw_cpu_logos(struct vt_device *vd)
{
        unsigned int ncpu, i;
        vt_axis_t left;
        struct terminal *tm = vd->vd_curwindow->vw_terminal;
        const teken_attr_t *a;

        if (vt_splash_ncpu)
                ncpu = vt_splash_ncpu;
        else {
                ncpu = mp_ncpus;
                if (ncpu < 1)
                        ncpu = 1;
        }

        a = teken_get_curattr(&tm->tm_emulator);
        if (vd->vd_driver->vd_drawrect)
                vd->vd_driver->vd_drawrect(vd, 0, 0, vd->vd_width - 1,
                    vt_logo_sprite_height - 1, 1, a->ta_bgcolor);
        /*
         * Blank is okay because we only ever draw beasties on full screen
         * refreshes.
         */
        else if (vd->vd_driver->vd_blank)
                vd->vd_driver->vd_blank(vd, a->ta_bgcolor);

        ncpu = MIN(ncpu, vd->vd_width / vt_logo_sprite_width);
        for (i = 0, left = 0; i < ncpu; left += vt_logo_sprite_width, i++)
                vt_draw_1_logo(vd, 0, left);
}

static void
vt_fini_logos(void *dummy __unused, int pending __unused)
{
        struct vt_device *vd;
        struct vt_window *vw;
        struct terminal *tm;
        struct vt_font *vf;
        struct winsize wsz;
        term_pos_t size;
        unsigned int i;

        if (!vt_draw_logo_cpus)
                return;
        if (!vty_enabled(VTY_VT))
                return;
        if (!vt_splash_cpu)
                return;

        vd = &vt_consdev;
        VT_LOCK(vd);
        if ((vd->vd_flags & (VDF_DEAD | VDF_TEXTMODE)) != 0) {
                VT_UNLOCK(vd);
                return;
        }
        vt_draw_logo_cpus = 0;
        VT_UNLOCK(vd);

        for (i = 0; i < VT_MAXWINDOWS; i++) {
                vw = vd->vd_windows[i];
                if (vw == NULL)
                        continue;
                tm = vw->vw_terminal;
                vf = vw->vw_font;
                if (vf == NULL)
                        continue;

                vt_termsize(vd, vf, &size);
                vt_winsize(vd, vf, &wsz);

                /* Resize screen buffer and terminal. */
                terminal_mute(tm, 1);
                vtbuf_grow(&vw->vw_buf, &size, vw->vw_buf.vb_history_size);
                terminal_set_winsize_blank(tm, &wsz, 0, NULL);
                terminal_set_cursor(tm, &vw->vw_buf.vb_cursor);
                terminal_mute(tm, 0);

                VT_LOCK(vd);
                vt_compute_drawable_area(vw);

                if (vd->vd_curwindow == vw) {
                        vd->vd_flags |= VDF_INVALID;
                        vt_resume_flush_timer(vw, 0);
                }
                VT_UNLOCK(vd);
        }
}

static void
vt_init_logos(void *dummy)
{
        struct vt_device *vd;
        struct vt_window *vw;
        struct terminal *tm;
        struct vt_font *vf;
        struct winsize wsz;
        term_pos_t size;

        if (!vty_enabled(VTY_VT))
                return;
        if (!vt_splash_cpu)
                return;

        vd = &vt_consdev;
        if (vd == NULL)
                return;
        vw = vd->vd_curwindow;
        if (vw == NULL)
                return;
        tm = vw->vw_terminal;
        if (tm == NULL)
                return;
        vf = vw->vw_font;
        if (vf == NULL)
                return;

        VT_LOCK(vd);
        if ((vd->vd_flags & VDF_INITIALIZED) == 0)
                goto out;
        if ((vd->vd_flags & (VDF_DEAD | VDF_TEXTMODE)) != 0)
                goto out;
        if (vd->vd_height <= vt_logo_sprite_height)
                goto out;

        vt_draw_logo_cpus = 1;
        VT_UNLOCK(vd);

        vt_termsize(vd, vf, &size);
        vt_winsize(vd, vf, &wsz);

        /* Resize screen buffer and terminal. */
        terminal_mute(tm, 1);
        vtbuf_grow(&vw->vw_buf, &size, vw->vw_buf.vb_history_size);
        terminal_set_winsize_blank(tm, &wsz, 0, NULL);
        terminal_set_cursor(tm, &vw->vw_buf.vb_cursor);
        terminal_mute(tm, 0);

        VT_LOCK(vd);
        vt_compute_drawable_area(vw);

        if (vd->vd_curwindow == vw) {
                vd->vd_flags |= VDF_INVALID;
                vt_resume_flush_timer(vw, 0);
        }

        TIMEOUT_TASK_INIT(taskqueue_thread, &vt_splash_cpu_fini_task, 0,
            vt_fini_logos, NULL);
        taskqueue_enqueue_timeout(taskqueue_thread, &vt_splash_cpu_fini_task,
            vt_splash_cpu_duration * hz);

out:
        VT_UNLOCK(vd);
}
SYSINIT(vt_logos, SI_SUB_TASKQ, SI_ORDER_ANY, vt_init_logos, NULL);