xref: /src/sys/dev/rasops/rasops15.c

/*	$NetBSD: rasops15.c,v 1.2 1999/04/13 00:40:09 ad Exp $ */

/*
 * Copyright (c) 1999 Andy Doran <ad (at) NetBSD.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 "opt_rasops.h"
#ifdef RASOPS15

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rasops15.c,v 1.2 1999/04/13 00:40:09 ad Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>

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

static void 	rasops15_putchar __P((void *, int, int, u_int, long attr));
static void 	rasops15_putchar8 __P((void *, int, int, u_int, long attr));
static void 	rasops15_putchar12 __P((void *, int, int, u_int, long attr));
static void 	rasops15_putchar16 __P((void *, int, int, u_int, long attr));
static void 	rasops15_erasecols __P((void *, int, int, int, long));
static void 	rasops15_eraserows __P((void *, int, int, long));
static void	rasops15_makestamp __P((struct rasops_info *, long));
static int32_t	rasops15_bg_color __P((struct rasops_info *, long));
static void	rasops15_do_cursor __P((struct rasops_info *));

void	rasops15_init __P((struct rasops_info *ri));

/*
 * (2x2)x1 stamp for optimized character blitting
 */
static int32_t	stamp[32];
static long	stamp_attr;
static int	stamp_mutex;	/* XXX see note in readme */

/*
 * XXX this confuses the hell out of gcc2 (not egcs) which always insists
 * that the shift count is negative.
 *
 * offset = STAMP_SHIFT(fontbits, nibble #) & STAMP_MASK
 * destination int32_t[0] = STAMP_READ(offset)
 * destination int32_t[1] = STAMP_READ(offset + 4)
 */
#define STAMP_SHIFT(fb,n)	((n*4-3) >= 0 ? (fb)>>(n*4-3):(fb)<<-(n*4-3))
#define STAMP_MASK		(15 << 3)
#define STAMP_READ(o)		(*(int32_t *)((caddr_t)stamp + (o)))


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

	switch (ri->ri_font->fontwidth) {
	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;

	default:
		ri->ri_ops.putchar = rasops15_putchar;
		break;
	}

	/* Select defaults for color masks if none selected */
	if (ri->ri_rnum == 0) {
		ri->ri_rnum = 5;
		ri->ri_rpos = 0;
		ri->ri_gnum = 5 + (ri->ri_depth == 16);
		ri->ri_gpos = 5;
		ri->ri_bnum = 5;
		ri->ri_bpos = 10 + (ri->ri_depth == 16);
	}

	ri->ri_ops.erasecols = rasops15_erasecols;
	ri->ri_ops.eraserows = rasops15_eraserows;
	ri->ri_do_cursor = rasops15_do_cursor;
	rasops_init_devcmap(ri);
}


/*
 * Get background color from attribute and copy across all 4 bytes
 * in a int32_t.
 */
static __inline__ int32_t
rasops15_bg_color(ri, attr)
	struct rasops_info *ri;
	long attr;
{
	int32_t bg;

	bg = ri->ri_devcmap[((u_int)attr >> 16) & 15];
	return bg | (bg << 16);
}


/*
 * Actually turn the cursor on or off. This does the dirty work for
 * rasops_cursor().
 */
static void
rasops15_do_cursor(ri)
	struct rasops_info *ri;
{
	u_char *rp, *dp;
	int full1, height, cnt, slop1, slop2, row, col;
	int32_t planemask;

	row = ri->ri_crow;
	col = ri->ri_ccol;

	rp = ri->ri_bits + row * ri->ri_yscale + col * ri->ri_xscale;
	height = ri->ri_font->fontheight;

	slop1 = (int)rp & 2;
	slop2 = (ri->ri_xscale - slop1) & 2;
	full1 = (ri->ri_xscale - slop1 - slop2) >> 2;
	planemask = ri->ri_devcmap[15] | (ri->ri_devcmap[15] << 16);

	while (height--) {
		dp = rp;
		rp += ri->ri_stride;

		if (slop1) {
			*(int16_t *)dp ^= (int16_t)planemask;
			dp += 2;
		}

		for (cnt = full1; cnt; cnt--) {
			*(int32_t *)dp ^= planemask;
			dp += 4;
		}

		if (slop2)
			*(int16_t *)dp ^= (int16_t)planemask;
	}
}


/*
 * Erase columns.
 */
static void
rasops15_erasecols(cookie, row, col, num, attr)
	void *cookie;
	int row, num;
	long attr;
{
	int n8, clr, height, cnt, slop1, slop2;
	struct rasops_info *ri;
	int32_t *dp;
	u_char *rp;

	ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
	/* Catches 'row < 0' case too */
	if ((unsigned)row >= (unsigned)ri->ri_rows)
		return;

	if (col < 0) {
		num += col;
		col = 0;
	}

	if ((col + num) > ri->ri_cols)
		num = ri->ri_cols - col;

	if (num <= 0)
		return;
#endif

	rp = ri->ri_bits + row * ri->ri_yscale + col * ri->ri_xscale;
	num *= ri->ri_xscale;
	clr = rasops15_bg_color(ri, attr);
	height = ri->ri_font->fontheight;

	slop1 = (int)rp & 2;
	slop2 = (num - slop1) & 2;
	num = num - slop1 - slop2;
	n8 = num >> 5;
	num = (num >> 2) & 7;

	while (height--) {
		dp = (u_int32_t *)rp;
		rp += ri->ri_stride;

		/* Align span to 4 bytes */
		if (slop1) {
			*(int16_t *)dp = (int16_t)clr;
			DELTA(dp, 2, int32_t *);
		}

		/* Write 32 bytes per loop */
		for (cnt = n8; cnt; cnt--) {
			dp[0] = clr;
			dp[1] = clr;
			dp[2] = clr;
			dp[3] = clr;
			dp[4] = clr;
			dp[5] = clr;
			dp[6] = clr;
			dp[7] = clr;
			dp += 8;
		}

		/* Write 4 bytes per loop */
		for (cnt = num; cnt; cnt--)
			*dp++ = clr;

		/* Write unaligned trailing slop */
		if (slop2)
			*(int16_t *)dp = (int16_t)clr;
	}
}


/*
 * Paint a single character.
 */
static void
rasops15_putchar(cookie, row, col, uc, attr)
	void *cookie;
	int row, col;
	u_int uc;
	long attr;
{
	struct rasops_info *ri;
	int fb, width, height, cnt, clr[2];
	u_char *dp, *rp, *fr;

	if (uc == (u_int)-1) {
		rasops15_erasecols(cookie, row, col, 1, attr);
		return;
	}

	ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
	/* Catches 'row < 0' case too */
	if ((unsigned)row >= (unsigned)ri->ri_rows)
		return;

	if ((unsigned)col >= (unsigned)ri->ri_cols)
		return;
#endif

	uc -= ri->ri_font->firstchar;
	rp = ri->ri_bits + row * ri->ri_yscale + col * ri->ri_xscale;
	fr = (u_char *)ri->ri_font->data + uc * ri->ri_fontscale;

	height = ri->ri_font->fontheight;
	width = ri->ri_font->fontwidth;

	clr[1] = ri->ri_devcmap[((u_int)attr >> 24) & 15];
	clr[0] = ri->ri_devcmap[((u_int)attr >> 16) & 15];

	while (height--) {
		dp = rp;
		fb = fr[3] | (fr[2] << 8) | (fr[1] << 16) | (fr[0] << 24);
		fr += ri->ri_font->stride;
		rp += ri->ri_stride;

		for (cnt = width; cnt; cnt--) {
			*(int16_t *)dp = (int16_t)clr[(fb >> 31) & 1];
			fb <<= 1;
			dp += 2;
		}
	}
}


/*
 * Recompute the (2x2)x1 blitting stamp.
 */
static void
rasops15_makestamp(ri, attr)
	struct rasops_info *ri;
	long attr;
{
	int32_t fg, bg;
	int i;

	fg = ri->ri_devcmap[((u_int)attr >> 24) & 15];
	bg = ri->ri_devcmap[((u_int)attr >> 16) & 15];
	stamp_attr = attr;

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


/*
 * Paint a single character. This is for 8-pixel wide fonts.
 */
static void
rasops15_putchar8(cookie, row, col, uc, attr)
	void *cookie;
	int row, col;
	u_int uc;
	long attr;
{
	struct rasops_info *ri;
	int height, so, fs;
	int32_t *rp;
	u_char *fr;

	/* Can't risk remaking the stamp if it's already in use */
	if (stamp_mutex++) {
		stamp_mutex--;
		rasops15_putchar(cookie, row, col, uc, attr);
		return;
	}

	ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
	if ((unsigned)row >= (unsigned)ri->ri_rows) {
		stamp_mutex--;
		return;
	}

	if ((unsigned)col >= (unsigned)ri->ri_cols) {
		stamp_mutex--;
		return;
	}
#endif

	/* Recompute stamp? */
	if (attr != stamp_attr)
		rasops15_makestamp(ri, attr);

	rp = (int32_t *)(ri->ri_bits + row*ri->ri_yscale + col*ri->ri_xscale);
	height = ri->ri_font->fontheight;

	if (uc == (u_int)-1) {
		while (height--) {
			rp[0] = stamp[0];
			rp[1] = stamp[0];
			rp[2] = stamp[0];
			rp[3] = stamp[0];
			DELTA(rp, ri->ri_stride, int32_t *);
		}
	} else {
		uc -= ri->ri_font->firstchar;
		fr = (u_char *)ri->ri_font->data + uc*ri->ri_fontscale;
		fs = ri->ri_font->stride;

		while (height--) {
			so = STAMP_SHIFT(fr[0], 1) & STAMP_MASK;
			rp[0] = STAMP_READ(so);
			rp[1] = STAMP_READ(so + 4);

			so = STAMP_SHIFT(fr[0], 0) & STAMP_MASK;
			rp[2] = STAMP_READ(so);
			rp[3] = STAMP_READ(so + 4);

			fr += fs;
			DELTA(rp, ri->ri_stride, int32_t *);
		}
	}

	stamp_mutex--;
}


/*
 * Paint a single character. This is for 12-pixel wide fonts.
 */
static void
rasops15_putchar12(cookie, row, col, uc, attr)
	void *cookie;
	int row, col;
	u_int uc;
	long attr;
{
	struct rasops_info *ri;
	int height, so, fs;
	int32_t *rp;
	u_char *fr;

	/* Can't risk remaking the stamp if it's already in use */
	if (stamp_mutex++) {
		stamp_mutex--;
		rasops15_putchar(cookie, row, col, uc, attr);
		return;
	}

	ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
	if ((unsigned)row >= (unsigned)ri->ri_rows) {
		stamp_mutex--;
		return;
	}

	if ((unsigned)col >= (unsigned)ri->ri_cols) {
		stamp_mutex--;
		return;
	}
#endif

	/* Recompute stamp? */
	if (attr != stamp_attr)
		rasops15_makestamp(ri, attr);

	rp = (int32_t *)(ri->ri_bits + row*ri->ri_yscale + col*ri->ri_xscale);
	height = ri->ri_font->fontheight;

	if (uc == (u_int)-1) {
		while (height--) {
			rp[0] = stamp[0];
			rp[1] = stamp[0];
			rp[2] = stamp[0];
			rp[3] = stamp[0];
			rp[4] = stamp[0];
			rp[5] = stamp[0];
			DELTA(rp, ri->ri_stride, int32_t *);
		}
	} else {
		uc -= ri->ri_font->firstchar;
		fr = (u_char *)ri->ri_font->data + uc*ri->ri_fontscale;
		fs = ri->ri_font->stride;

		while (height--) {
			so = STAMP_SHIFT(fr[0], 1) & STAMP_MASK;
			rp[0] = STAMP_READ(so);
			rp[1] = STAMP_READ(so + 4);

			so = STAMP_SHIFT(fr[0], 0) & STAMP_MASK;
			rp[2] = STAMP_READ(so);
			rp[3] = STAMP_READ(so + 4);

			so = STAMP_SHIFT(fr[1], 1) & STAMP_MASK;
			rp[4] = STAMP_READ(so);
			rp[5] = STAMP_READ(so + 4);

			fr += fs;
			DELTA(rp, ri->ri_stride, int32_t *);
		}
	}

	stamp_mutex--;
}


/*
 * Paint a single character. This is for 16-pixel wide fonts.
 */
static void
rasops15_putchar16(cookie, row, col, uc, attr)
	void *cookie;
	int row, col;
	u_int uc;
	long attr;
{
	struct rasops_info *ri;
	int height, so, fs;
	int32_t *rp;
	u_char *fr;

	/* Can't risk remaking the stamp if it's already in use */
	if (stamp_mutex++) {
		stamp_mutex--;
		rasops15_putchar(cookie, row, col, uc, attr);
		return;
	}

	ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
	if ((unsigned)row >= (unsigned)ri->ri_rows) {
		stamp_mutex--;
		return;
	}

	if ((unsigned)col >= (unsigned)ri->ri_cols) {
		stamp_mutex--;
		return;
	}
#endif

	/* Recompute stamp? */
	if (attr != stamp_attr)
		rasops15_makestamp(ri, attr);

	rp = (int32_t *)(ri->ri_bits + row*ri->ri_yscale + col*ri->ri_xscale);
	height = ri->ri_font->fontheight;

	if (uc == (u_int)-1) {
		while (height--) {
			rp[0] = stamp[0];
			rp[1] = stamp[0];
			rp[2] = stamp[0];
			rp[3] = stamp[0];
			rp[4] = stamp[0];
			rp[5] = stamp[0];
			rp[6] = stamp[0];
			rp[7] = stamp[0];
			DELTA(rp, ri->ri_stride, int32_t *);
		}
	} else {
		uc -= ri->ri_font->firstchar;
		fr = (u_char *)ri->ri_font->data + uc*ri->ri_fontscale;
		fs = ri->ri_font->stride;

		while (height--) {
			so = STAMP_SHIFT(fr[0], 1) & STAMP_MASK;
			rp[0] = STAMP_READ(so);
			rp[1] = STAMP_READ(so + 4);

			so = STAMP_SHIFT(fr[0], 0) & STAMP_MASK;
			rp[2] = STAMP_READ(so);
			rp[3] = STAMP_READ(so + 4);

			so = STAMP_SHIFT(fr[1], 1) & STAMP_MASK;
			rp[4] = STAMP_READ(so);
			rp[5] = STAMP_READ(so + 4);

			so = STAMP_SHIFT(fr[1], 0) & STAMP_MASK;
			rp[6] = STAMP_READ(so);
			rp[7] = STAMP_READ(so + 4);

			DELTA(rp, ri->ri_stride, int32_t *);
			fr += fs;
		}
	}

	stamp_mutex--;
}


/*
 * Erase rows.
 */
static void
rasops15_eraserows(cookie, row, num, attr)
	void *cookie;
	int row, num;
	long attr;
{
	struct rasops_info *ri;
	int32_t *dp, clr;
	int n8, n1, cnt;

	ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
	if (row < 0) {
		num += row;
		row = 0;
	}

	if ((row + num) > ri->ri_rows)
		num = ri->ri_rows - row;

	if (num <= 0)
		return;
#endif

	num *= ri->ri_font->fontheight;
	dp = (int32_t *)(ri->ri_bits + row * ri->ri_yscale);
	clr = rasops15_bg_color(ri, attr);

	n8 = ri->ri_emustride >> 5;
	n1 = (ri->ri_emustride >> 2) & 7;

	while (num--) {
		for (cnt = n8; cnt; cnt--) {
			dp[0] = clr;
			dp[1] = clr;
			dp[2] = clr;
			dp[3] = clr;
			dp[4] = clr;
			dp[5] = clr;
			dp[6] = clr;
			dp[7] = clr;
			dp += 8;
		}

		for (cnt = n1; cnt; cnt--)
			*dp++ = clr;

		DELTA(dp, ri->ri_delta, int32_t *);
	}
}

#endif /* RASOPS15 */