/*      $NetBSD: fb.c,v 1.5 2017/08/27 02:19:08 jmcneill Exp $  */

/*-
* Copyright (c) 2002 TAKEMRUA Shin
* 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.
* 3. Neither the name of The NetBSD Foundation nor the names of its
*    contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <string.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/mman.h>

#include "tpctl.h"

#ifndef lint
#include <sys/cdefs.h>
__RCSID("$NetBSD: fb.c,v 1.5 2017/08/27 02:19:08 jmcneill Exp $");
#endif /* not lint */

#define INVALID_CACHE -1
#define ALIGN(a, n)     ((typeof(a))(((int)(a) + (n) - 1) / (n) * (n)))
#define ABS(a)          ((a) < 0 ? -(a) : (a))
#define SWAP(a, b)      do {                            \
               typeof(a) tmp;                          \
               tmp = (a); (a) = (b); (b) = tmp;        \
       } while(0)
#define bitsizeof(t)    (sizeof(t) * 8)

int
fb_dispmode(struct fb *fb, int dispmode)
{

       if (fb->dispmode != dispmode) {
           if (ioctl(fb->fd, WSDISPLAYIO_SMODE, &dispmode) < 0)
               return (-1);
           fb->dispmode = dispmode;
       }

       return (0);
}

int
fb_init(struct fb *fb, int fd)
{
       struct wsdisplay_fbinfo fbinfo;
       u_int linebytes;
       int y;
       size_t size;

       fb->fd = fd;
       fb->linecache_y = INVALID_CACHE;
       fb->conf.hf_conf_index = HPCFB_CURRENT_CONFIG;
       if (ioctl(fb->fd, WSDISPLAYIO_GMODE, &fb->dispmode) < 0)
               return (-1);
       if (ioctl(fb->fd, HPCFBIO_GCONF, &fb->conf) < 0) {
               if (ioctl(fb->fd, WSDISPLAYIO_GINFO, &fbinfo) < 0 ||
                   ioctl(fb->fd, WSDISPLAYIO_LINEBYTES, &linebytes) < 0)
                       return (-1);
               memset(&fb->conf, 0, sizeof(fb->conf));
               fb->conf.hf_width = fbinfo.width;
               fb->conf.hf_height = fbinfo.height;
               fb->conf.hf_bytes_per_line = linebytes;
               fb->conf.hf_nplanes = 1;
               fb->conf.hf_bytes_per_plane = fbinfo.height * linebytes;
               fb->conf.hf_pack_width = fbinfo.depth;
               fb->conf.hf_pixels_per_pack = 1;
               fb->conf.hf_pixel_width = 1;
               fb->conf.hf_access_flags = HPCFB_ACCESS_STATIC |
                   HPCFB_ACCESS_BYTE | HPCFB_ACCESS_WORD | HPCFB_ACCESS_DWORD;
       }

       if (fb_dispmode(fb, WSDISPLAYIO_MODE_MAPPED) < 0)
               return (-1);

       size = (size_t)fb->conf.hf_bytes_per_line * fb->conf.hf_height;
       size += fb->conf.hf_offset;
       size = ALIGN(size, getpagesize());
       fb->baseaddr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,0);
       if (fb->baseaddr == MAP_FAILED)
               return (-1);
       fb->baseaddr += fb->conf.hf_offset;

       size = ALIGN(fb->conf.hf_bytes_per_line, 16);
       fb->linecache = (fb_pixel_t*)malloc(size);
       if (fb->linecache == NULL)
               return (-1);
       fb->workbuf = (fb_pixel_t*)malloc(size);
       if (fb->workbuf == NULL)
               return (-1);

       if (fb->conf.hf_access_flags & HPCFB_ACCESS_REVERSE) {
               fb->white = 0;
               fb->black = ~0;
       } else {
               fb->white = ~0;
               fb->black = 0;
       }

       /*
        * clear screen
        */
       for (y = 0; y < fb->conf.hf_height; y++) {
               fb_getline(fb, y);
               memset(fb->linecache, fb->black,
                   ALIGN(fb->conf.hf_bytes_per_line, 16));
               fb_putline(fb, y);
       }

       return (0);
}

static void
__fb_swap_workbuf(struct fb *fb)
{
       int i, n;

       n = ALIGN(fb->conf.hf_bytes_per_line, 16) / sizeof(fb_pixel_t);
       if (fb->conf.hf_order_flags & HPCFB_REVORDER_BYTE) {
               for (i = 0; i < n; i++)
                       fb->workbuf[i] =
                           ((fb->workbuf[i] << 8) & 0xff00ff00) |
                           ((fb->workbuf[i] >> 8) & 0x00ff00ff);
       }
       if (fb->conf.hf_order_flags & HPCFB_REVORDER_WORD) {
               for (i = 0; i < n; i++)
                       fb->workbuf[i] =
                           ((fb->workbuf[i] << 16) & 0xffff0000) |
                           ((fb->workbuf[i] >> 16) & 0x0000ffff);
       }
       if (fb->conf.hf_order_flags & HPCFB_REVORDER_DWORD) {
               for (i = 0; i < n; i += 2) {
                       fb_pixel_t tmp;
                       tmp = fb->workbuf[i];
                       fb->workbuf[i] = fb->workbuf[i + 1];
                       fb->workbuf[i + 1] = tmp;
               }
       }
       if (fb->conf.hf_order_flags & HPCFB_REVORDER_QWORD) {
               for (i = 0; i < n; i += 4) {
                       fb_pixel_t tmp;
                       tmp = fb->workbuf[i + 0];
                       fb->workbuf[i + 0] = fb->workbuf[i + 2];
                       fb->workbuf[i + 2] = tmp;
                       tmp = fb->workbuf[i + 1];
                       fb->workbuf[i + 1] = fb->workbuf[i + 3];
                       fb->workbuf[i + 3] = tmp;
               }
       }
}

static void
__fb_put_pixel(struct fb *fb, fb_pixel_t pixel, int width, int x)
{
       fb_pixel_t mask = (1 << width) - 1;

       x -= (bitsizeof(fb_pixel_t) - width);
       if (x < 0) {
               pixel <<= -x;
               mask <<= -x;
               fb->linecache[0] = (fb->linecache[0]&~mask) | (pixel&~mask);
       } else {
               fb_pixel_t *dst = &fb->linecache[x / bitsizeof(fb_pixel_t)];
               x %= bitsizeof(fb_pixel_t);
               *dst = (*dst & ~(mask>>x)) | ((pixel>>x) & (mask>>x));
               dst++;
               if (x == 0)
                       return;
               x = bitsizeof(fb_pixel_t) - x;
               *dst = (*dst & ~(mask<<x)) | ((pixel<<x) & (mask<<x));
       }
}

void
fb_getline(struct fb *fb, int y)
{
       int i, n;
       unsigned char *src;
       fb_pixel_t *dst;

       src = fb->baseaddr + fb->conf.hf_bytes_per_line * y;
       dst = fb->workbuf;
       n = ALIGN(fb->conf.hf_bytes_per_line, 16) / sizeof(fb_pixel_t);
       for (i = 0; i < n; i++) {
               *dst++ = ((fb_pixel_t)src[0] << 24) |
                   ((fb_pixel_t)src[1] << 16) |
                   ((fb_pixel_t)src[2] << 8) |
                   ((fb_pixel_t)src[3] << 0);
               src += 4;
       }

       __fb_swap_workbuf(fb);
       memcpy(fb->linecache, fb->workbuf, n * sizeof(fb_pixel_t));
}

void
fb_putline(struct fb *fb, int y)
{
       int i, n;
       unsigned char *dst;
       fb_pixel_t *src;

       src = fb->workbuf;
       dst = fb->baseaddr + fb->conf.hf_bytes_per_line * y;
       n = ALIGN(fb->conf.hf_bytes_per_line, 16) / sizeof(fb_pixel_t);
       memcpy(fb->workbuf, fb->linecache, n * sizeof(fb_pixel_t));
       __fb_swap_workbuf(fb);
       for (i = 0; i < n; i++) {
               *dst++ = (*src >> 24) & 0xff;
               *dst++ = (*src >> 16) & 0xff;
               *dst++ = (*src >>  8) & 0xff;
               *dst++ = (*src >>  0) & 0xff;
               src++;
       }
}

void
fb_fetchline(struct fb *fb, int y)
{
       if (fb->linecache_y == y)
               return;
       fb_getline(fb, y);
       fb->linecache_y = y;
}

void
fb_flush(struct fb *fb)
{
       if (fb->linecache_y != INVALID_CACHE)
               fb_putline(fb, fb->linecache_y);
}

void
fb_drawpixel(struct fb *fb, int x, int y, fb_pixel_t pixel)
{
       int pack;

       if (fb->conf.hf_access_flags & HPCFB_ACCESS_Y_TO_X)
               SWAP(x, y);
       if (fb->conf.hf_access_flags & HPCFB_ACCESS_R_TO_L)
               x = fb->conf.hf_width - x - 1;
       if (fb->conf.hf_access_flags & HPCFB_ACCESS_B_TO_T)
               y = fb->conf.hf_height - y - 1;

       if (x < 0 || y < 0 || fb->conf.hf_width <= x || fb->conf.hf_height < y)
               return;

       pack = x / fb->conf.hf_pixels_per_pack;
       x %= fb->conf.hf_pixels_per_pack;
       if (fb->conf.hf_access_flags & HPCFB_ACCESS_LSB_TO_MSB)
               x = fb->conf.hf_pixels_per_pack - x - 1;
       x *= fb->conf.hf_pixel_width;
       if (fb->conf.hf_access_flags & HPCFB_ACCESS_PACK_BLANK)
               x += (fb->conf.hf_pack_width -
                   fb->conf.hf_pixel_width * fb->conf.hf_pixels_per_pack);
       x += pack * fb->conf.hf_pack_width;

       if (fb->linecache_y != y) {
               fb_flush(fb);
               fb_fetchline(fb, y);
       }

       __fb_put_pixel(fb, pixel, fb->conf.hf_pixel_width, x);
}

void
fb_drawline(struct fb *fb, int x0, int y0, int x1, int y1, fb_pixel_t pixel)
{
       int i, dx, dy, d, incdec;

       dx = ABS(x1 - x0);
       dy = ABS(y1 - y0);
       if (dx < dy) {
               if (y1 < y0) {
                       SWAP(x0, x1);
                       SWAP(y0, y1);
               }
               if (x0 < x1)
                       incdec = 1;
               else
                       incdec = -1;
               d = -dy;
               dx *= 2;
               dy *= 2;
               for (i = y0; i <= y1; i++) {
                       fb_drawpixel(fb, x0, i, pixel);
                       d += dx;
                       if (0 <= d) {
                               d -= dy;
                               x0 += incdec;
                       }
               }
       } else {
               if (x1 < x0) {
                       SWAP(x0, x1);
                       SWAP(y0, y1);
               }
               if (y0 < y1)
                       incdec = 1;
               else
                       incdec = -1;
               d = -dx;
               dx *= 2;
               dy *= 2;
               for (i = x0; i <= x1; i++) {
                       fb_drawpixel(fb, i, y0, pixel);
                       d += dy;
                       if (0 <= d) {
                               d -= dx;
                               y0 += incdec;
                       }
               }
       }
}

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