/*      $OpenBSD: rasops15.c,v 1.10 2023/01/18 11:08:49 nicm Exp $      */
/*      $NetBSD: rasops15.c,v 1.7 2000/04/12 14:22:29 pk 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/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>

int     rasops15_putchar(void *, int, int, u_int, uint32_t attr);
#ifndef RASOPS_SMALL
int     rasops15_putchar8(void *, int, int, u_int, uint32_t attr);
int     rasops15_putchar12(void *, int, int, u_int, uint32_t attr);
int     rasops15_putchar16(void *, int, int, u_int, uint32_t attr);
void    rasops15_makestamp(struct rasops_info *, uint32_t);

/*
 * (2x2)x1 stamp for optimized character blitting
 */
static int32_t  stamp[32];
static uint32_t stamp_attr;
static int      stamp_mutex;    /* XXX see note in readme */
#endif

/*
 * 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)))

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

        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;
                break;
        }

        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);
        }
}

/*
 * Paint a single character.
 */
int
rasops15_putchar(void *cookie, int row, int col, u_int uc, uint32_t attr)
{
        int fb, width, height, cnt, clr[2];
        struct rasops_info *ri;
        u_char *dp, *rp, *fr;

        ri = (struct rasops_info *)cookie;

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

        if ((unsigned)col >= (unsigned)ri->ri_cols)
                return 0;
#endif

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

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

        if (uc == ' ') {
                int16_t c = (int16_t)clr[0];
                while (height--) {
                        dp = rp;
                        rp += ri->ri_stride;

                        for (cnt = width; cnt; cnt--) {
                                *(int16_t *)dp = c;
                                dp += 2;
                        }
                }
        } else {
                uc -= ri->ri_font->firstchar;
                fr = (u_char *)ri->ri_font->data + uc * ri->ri_fontscale;

                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;
                        }
                }
        }

        /* Do underline */
        if ((attr & WSATTR_UNDERLINE) != 0) {
                int16_t c = (int16_t)clr[1];
                rp -= ri->ri_stride << 1;

                while (width--) {
                        *(int16_t *)rp = c;
                        rp += 2;
                }
        }

        return 0;
}

#ifndef RASOPS_SMALL
/*
 * Recompute the (2x2)x1 blitting stamp.
 */
void
rasops15_makestamp(struct rasops_info *ri, uint32_t attr)
{
        int32_t fg, bg;
        int i;

        fg = ri->ri_devcmap[((u_int)attr >> 24) & 0xf] & 0xffff;
        bg = ri->ri_devcmap[((u_int)attr >> 16) & 0xf] & 0xffff;
        stamp_attr = attr;

        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 + 1] = (i & 2 ? fg : bg);
                stamp[i + 1] |= ((i & 4 ? fg : bg) << 16);
                stamp[i] = (i & 8 ? fg : bg);
                stamp[i] |= ((i & 16 ? fg : bg) << 16);
#endif
        }
}

/*
 * Paint a single character. This is for 8-pixel wide fonts.
 */
int
rasops15_putchar8(void *cookie, int row, int col, u_int uc, uint32_t 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--;
                return rasops15_putchar(cookie, row, col, uc, attr);
        }

        ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
        if ((unsigned)row >= (unsigned)ri->ri_rows) {
                stamp_mutex--;
                return 0;
        }

        if ((unsigned)col >= (unsigned)ri->ri_cols) {
                stamp_mutex--;
                return 0;
        }
#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) {
                int32_t c = stamp[0];
                while (height--) {
                        rp[0] = rp[1] = rp[2] = rp[3] = c;
                        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 *);
                }
        }

        /* Do underline */
        if ((attr & WSATTR_UNDERLINE) != 0) {
                int32_t c = STAMP_READ(28);

                DELTA(rp, -(ri->ri_stride << 1), int32_t *);
                rp[0] = rp[1] = rp[2] = rp[3] = c;
        }

        stamp_mutex--;

        return 0;
}

/*
 * Paint a single character. This is for 12-pixel wide fonts.
 */
int
rasops15_putchar12(void *cookie, int row, int col, u_int uc, uint32_t 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--;
                return rasops15_putchar(cookie, row, col, uc, attr);
        }

        ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
        if ((unsigned)row >= (unsigned)ri->ri_rows) {
                stamp_mutex--;
                return 0;
        }

        if ((unsigned)col >= (unsigned)ri->ri_cols) {
                stamp_mutex--;
                return 0;
        }
#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) {
                int32_t c = stamp[0];
                while (height--) {
                        rp[0] = rp[1] = rp[2] = rp[3] = rp[4] = rp[5] = c;
                        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 *);
                }
        }

        /* Do underline */
        if (attr & WSATTR_UNDERLINE) {
                int32_t c = STAMP_READ(28);

                DELTA(rp, -(ri->ri_stride << 1), int32_t *);
                rp[0] = rp[1] = rp[2] = rp[3] = rp[4] = rp[5] = c;
        }

        stamp_mutex--;

        return 0;
}

/*
 * Paint a single character. This is for 16-pixel wide fonts.
 */
int
rasops15_putchar16(void *cookie, int row, int col, u_int uc, uint32_t 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--;
                return rasops15_putchar(cookie, row, col, uc, attr);
        }

        ri = (struct rasops_info *)cookie;

#ifdef RASOPS_CLIPPING
        if ((unsigned)row >= (unsigned)ri->ri_rows) {
                stamp_mutex--;
                return 0;
        }

        if ((unsigned)col >= (unsigned)ri->ri_cols) {
                stamp_mutex--;
                return 0;
        }
#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) {
                int32_t c = stamp[0];
                while (height--) {
                        rp[0] = rp[1] = rp[2] = rp[3] =
                        rp[4] = rp[5] = rp[6] = rp[7] = c;
                        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;
                }
        }

        /* Do underline */
        if (attr & WSATTR_UNDERLINE) {
                int32_t c = STAMP_READ(28);

                DELTA(rp, -(ri->ri_stride << 1), int32_t *);
                rp[0] = rp[1] = rp[2] = rp[3] =
                rp[4] = rp[5] = rp[6] = rp[7] = c;
        }

        stamp_mutex--;

        return 0;
}
#endif  /* !RASOPS_SMALL */