/*      $NetBSD: rasops15.c,v 1.39 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: rasops15.c,v 1.39 2019/08/14 00:51:10 rin Exp $");

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

#include <sys/param.h>

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

#define _RASOPS_PRIVATE
#define RASOPS_DEPTH    15
#include <dev/rasops/rasops.h>

static void     rasops15_putchar(void *, int, int, u_int, long);
static void     rasops15_putchar_aa(void *, int, int, u_int, long);
#ifndef RASOPS_SMALL
static void     rasops15_putchar8(void *, int, int, u_int, long);
static void     rasops15_putchar12(void *, int, int, u_int, long);
static void     rasops15_putchar16(void *, int, int, u_int, long);
static void     rasops15_makestamp(struct rasops_info *, long);
#endif

#ifndef RASOPS_SMALL
/* stamp for optimized character blitting */
static uint32_t                 stamp[32];
static long                     stamp_attr;
static struct rasops_info       *stamp_ri;

/*
* offset = STAMP_SHIFT(fontbits, nibble #) & STAMP_MASK
* destination uint32_t[0] = STAMP_READ(offset)
* destination uint32_t[1] = STAMP_READ(offset + 4)
*/
#define STAMP_SHIFT(fb, n)      ((n) ? (fb) >> 1: (fb) << 3)
#define STAMP_MASK              (0xf << 3)
#define STAMP_READ(o)           (*(uint32_t *)((uint8_t *)stamp + (o)))
#endif

/*
* Initialize rasops_info struct for this colordepth.
*/
void
rasops15_init(struct rasops_info *ri)
{

       if (ri->ri_rnum == 0) {
               ri->ri_rnum = ri->ri_gnum = ri->ri_bnum = 5;
               ri->ri_gnum += (ri->ri_depth == 16);

               ri->ri_rpos = 10 + (ri->ri_depth == 16);
               ri->ri_gpos = 5;
               ri->ri_bpos = 0;
       }

       if (FONT_IS_ALPHA(ri->ri_font)) {
               ri->ri_ops.putchar = rasops15_putchar_aa;
               return;
       }

       switch (ri->ri_font->fontwidth) {
#ifndef RASOPS_SMALL
       case 8:
               ri->ri_ops.putchar = rasops15_putchar8;
               break;
       case 12:
               ri->ri_ops.putchar = rasops15_putchar12;
               break;
       case 16:
               ri->ri_ops.putchar = rasops15_putchar16;
               break;
#endif  /* !RASOPS_SMALL */
       default:
               ri->ri_ops.putchar = rasops15_putchar;
               return;
       }

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

/* rasops15_putchar */
#undef  RASOPS_AA
#include <dev/rasops/rasops_putchar.h>

/* rasops15_putchar_aa */
#define RASOPS_AA
#include <dev/rasops/rasops_putchar.h>
#undef  RASOPS_AA

#ifndef RASOPS_SMALL
/*
* Recompute the 4x1 blitting stamp.
*/
static void
rasops15_makestamp(struct rasops_info *ri, long attr)
{
       int i;
       uint32_t bg, fg;

       stamp_attr = attr;
       stamp_ri = ri;

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

       for (i = 0; i < 32; i += 2) {
#if BYTE_ORDER == LITTLE_ENDIAN
               stamp[i]      = (i & 16 ? fg : bg);
               stamp[i]     |= (i &  8 ? fg : bg) << 16;
               stamp[i + 1]  = (i &  4 ? fg : bg);
               stamp[i + 1] |= (i &  2 ? fg : bg) << 16;
#else
               stamp[i]      = (i &  8 ? fg : bg);
               stamp[i]     |= (i & 16 ? fg : bg) << 16;
               stamp[i + 1]  = (i &  2 ? fg : bg);
               stamp[i + 1] |= (i &  4 ? fg : bg) << 16;
#endif
       }
}

/*
* 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 */

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