/*      $NetBSD: rasops4.c,v 1.28 2019/08/14 00:51:10 rin Exp $ */

/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Doran.
*
* 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 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rasops4.c,v 1.28 2019/08/14 00:51:10 rin Exp $");

#ifdef _KERNEL_OPT
#include "opt_rasops.h"
#endif

#include <sys/param.h>

#include <machine/endian.h>

#include <dev/wscons/wsdisplayvar.h>
#include <dev/wscons/wsconsio.h>

#define _RASOPS_PRIVATE
#define RASOPS_DEPTH    4
#include <dev/rasops/rasops.h>
#include <dev/rasops/rasops_masks.h>

static void     rasops4_copycols(void *, int, int, int, int);
static void     rasops4_erasecols(void *, int, int, int, long);
static void     rasops4_do_cursor(struct rasops_info *);
static void     rasops4_putchar(void *, int, int col, u_int, long);
#ifndef RASOPS_SMALL
static void     rasops4_putchar8(void *, int, int col, u_int, long);
static void     rasops4_putchar12(void *, int, int col, u_int, long);
static void     rasops4_putchar16(void *, int, int col, u_int, long);
static void     rasops4_makestamp(struct rasops_info *, long);
#endif

#ifndef RASOPS_SMALL
/* stamp for optimized character blitting */
static uint16_t                 stamp[16];
static long                     stamp_attr;
static struct rasops_info       *stamp_ri;

/*
* offset = STAMP_SHIFT(fontbits, nibble #) & STAMP_MASK
* destination = STAMP_READ(offset)
*/
#define STAMP_SHIFT(fb, n)      ((n) ? (fb) >> 4 : (fb))
#define STAMP_MASK              0xf
#define STAMP_READ(o)           stamp[o]
#endif

/*
* Initialize rasops_info struct for this colordepth.
*/
void
rasops4_init(struct rasops_info *ri)
{

       if ((ri->ri_font->fontwidth & 1) != 0) {
               ri->ri_ops.erasecols = rasops4_erasecols;
               ri->ri_ops.copycols = rasops4_copycols;
               ri->ri_do_cursor = rasops4_do_cursor;
       }

       switch (ri->ri_font->fontwidth) {
#ifndef RASOPS_SMALL
       case 8:
               ri->ri_ops.putchar = rasops4_putchar8;
               break;
       case 12:
               ri->ri_ops.putchar = rasops4_putchar12;
               break;
       case 16:
               ri->ri_ops.putchar = rasops4_putchar16;
               break;
#endif  /* !RASOPS_SMALL */
       default:
               ri->ri_ops.putchar = rasops4_putchar;
               return;
       }

#ifndef RASOPS_SMALL
       stamp_attr = -1;
       stamp_ri = NULL;
#endif
}

#ifndef RASOPS_SMALL
/*
* Recompute the blitting stamp.
*/
static void
rasops4_makestamp(struct rasops_info *ri, long attr)
{
       int i;
       uint32_t bg, fg;

       stamp_attr = attr;
       stamp_ri = ri;

       bg = ATTR_BG(ri, attr) & 0xf;
       fg = ATTR_FG(ri, attr) & 0xf;

       for (i = 0; i < 16; i++) {
#if BYTE_ORDER == LITTLE_ENDIAN
               if ((ri->ri_flg & RI_BSWAP) == 0)
#else
               if ((ri->ri_flg & RI_BSWAP) != 0)
#endif
               {
                       /* little endian */
                       stamp[i]  = (i & 1 ? fg : bg) << 12;
                       stamp[i] |= (i & 2 ? fg : bg) << 8;
                       stamp[i] |= (i & 4 ? fg : bg) << 4;
                       stamp[i] |= (i & 8 ? fg : bg) << 0;
               } else {
                       /* big endian */
                       stamp[i]  = (i & 1 ? fg : bg) << 0;
                       stamp[i] |= (i & 2 ? fg : bg) << 4;
                       stamp[i] |= (i & 4 ? fg : bg) << 8;
                       stamp[i] |= (i & 8 ? fg : bg) << 12;
               }
       }
}

/*
* Width-optimized putchar functions
*/
#define RASOPS_WIDTH    8
#include <dev/rasops/rasops_putchar_width.h>
#undef  RASOPS_WIDTH

#define RASOPS_WIDTH    12
#include <dev/rasops/rasops_putchar_width.h>
#undef  RASOPS_WIDTH

#define RASOPS_WIDTH    16
#include <dev/rasops/rasops_putchar_width.h>
#undef  RASOPS_WIDTH

#endif  /* !RASOPS_SMALL */

/* rasops4_putchar */
#undef  RASOPS_AA
#include <dev/rasops/rasops1-4_putchar.h>

/*
* Grab routines common to depths where (bpp < 8)
*/
#include <dev/rasops/rasops_bitops.h>

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