/* $NetBSD: rasops1-4_putchar.h,v 1.3 2019/08/10 01:24:17 rin Exp $ */

/* NetBSD: rasops_bitops.h,v 1.23 2019/08/02 04:39:09 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.
 */

#define PIXEL_BITS      RASOPS_DEPTH

#if   RASOPS_DEPTH == 1
#define PIXEL_SHIFT     0
#elif RASOPS_DEPTH == 2
#define PIXEL_SHIFT     1
#elif RASOPS_DEPTH == 4
#define PIXEL_SHIFT     2
#else
#error "Depth not supported"
#endif

#ifndef RASOPS_AA
#define COLOR_MASK      __BITS(32 - PIXEL_BITS, 31)
#else
#  if RASOPS_DEPTH == 2
#define COLOR_MASK      0x3
#  else
#error "Anti-aliasing not supported"
#  endif
#endif

#ifndef RASOPS_AA
#define PIXEL_OR(tmp)                                                   \
        do {                                                            \
                (tmp) |= clr[(fb >> 31) & 1] >> bit;                    \
                fb <<= 1;                                               \
        } while (0 /* CONSTCOND */)
#else
#define PIXEL_OR(tmp)                                                   \
        do {                                                            \
                uint8_t c, w = *fr++;                                   \
                if (w == 0xff)                                          \
                        c = clr[1];                                     \
                else if (w == 0)                                        \
                        c = clr[0];                                     \
                else                                                    \
                        c = (w * clr[1] + (0xff - w) * clr[0]) >> 8;    \
                (tmp) |= c << (32 - PIXEL_BITS - bit);                  \
        } while (0 /* CONSTCOND */)
#endif

#define NAME(depth)     NAME1(depth)
#ifndef RASOPS_AA
#define NAME1(depth)    rasops ## depth ## _ ## putchar
#else
#define NAME1(depth)    rasops ## depth ## _ ## putchar_aa
#endif

/*
 * Paint a single character. This function is also applicable to
 * monochrome, but that in rasops1.c is much simpler and faster.
 */
static void
NAME(RASOPS_DEPTH)(void *cookie, int row, int col, u_int uc, long attr)
{
        struct rasops_info *ri = (struct rasops_info *)cookie;
        struct wsdisplay_font *font = PICK_FONT(ri, uc);
        int height, width, full, cnt, bit;
        uint32_t bg, fg, lbg, rbg, clr[2], lmask, rmask, tmp;
        uint32_t *rp, *bp, *hp;
        uint8_t *fr;
        bool space;

        hp = NULL;      /* XXX GCC */

        if (__predict_false(!CHAR_IN_FONT(uc, font)))
                return;

#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

        height = font->fontheight;
        width = font->fontwidth << PIXEL_SHIFT;
        col *= width;

        rp = (uint32_t *)(ri->ri_bits + row * ri->ri_yscale +
            ((col >> 3) & ~3));
        if (ri->ri_hwbits)
                hp = (uint32_t *)(ri->ri_hwbits + row * ri->ri_yscale +
                    ((col >> 3) & ~3));

        col &= 31;

        bg = ATTR_BG(ri, attr);
        fg = ATTR_FG(ri, attr);

        /* If fg and bg match this becomes a space character */
        if (uc == ' ' || __predict_false(fg == bg)) {
                space = true;
                fr = NULL;      /* XXX GCC */
        } else {
                space = false;
                fr = FONT_GLYPH(uc, font, ri);
        }

        if (col + width <= 32) {
                /* Single word, only one mask */
                rmask = rasops_pmask[col][width & 31];
                lmask = ~rmask;

                if (space) {
                        bg &= rmask;
                        while (height--) {
                                tmp = (*rp & lmask) | bg;
                                *rp = tmp;
                                if (ri->ri_hwbits) {
                                        *hp = tmp;
                                        DELTA(hp, ri->ri_stride, uint32_t *);
                                }
                                DELTA(rp, ri->ri_stride, uint32_t *);
                        }
                } else {
                        clr[0] = bg & COLOR_MASK;
                        clr[1] = fg & COLOR_MASK;

                        while (height--) {
#ifndef RASOPS_AA
                                uint32_t fb = rasops_be32uatoh(fr);
                                fr += ri->ri_font->stride;
#endif

                                tmp = 0;
                                for (bit = col; bit < col + width;
                                    bit += PIXEL_BITS)
                                        PIXEL_OR(tmp);
                                tmp = (*rp & lmask) | MBE(tmp);
                                *rp = tmp;

                                if (ri->ri_hwbits) {
                                        *hp = tmp;
                                        DELTA(hp, ri->ri_stride, uint32_t *);
                                }

                                DELTA(rp, ri->ri_stride, uint32_t *);
                        }
                }

                /* Do underline */
                if ((attr & WSATTR_UNDERLINE) != 0) {
                        DELTA(rp, - ri->ri_stride * ri->ri_ul.off, uint32_t *);
                        if (ri->ri_hwbits)
                                DELTA(hp, - ri->ri_stride * ri->ri_ul.off,
                                    uint32_t *);

                        for (height = ri->ri_ul.height; height; height--) {
                                DELTA(rp, - ri->ri_stride, uint32_t *);
                                tmp = (*rp & lmask) | (fg & rmask);
                                *rp = tmp;
                                if (ri->ri_hwbits) {
                                        DELTA(hp, - ri->ri_stride, uint32_t *);
                                        *hp = tmp;
                                }
                        }
                }

                return;
        }

        /* Word boundary, two masks needed */
        lmask = ~rasops_lmask[col];
        rmask = ~rasops_rmask[(col + width) & 31];

        if (lmask != -1)
                width -= 32 - col;

        full = width / 32;
        width -= full * 32;

        if (space) {
                lbg = bg & ~lmask;
                rbg = bg & ~rmask;

                while (height--) {
                        bp = rp;

                        if (lmask != -1) {
                                *bp = (*bp & lmask) | lbg;
                                bp++;
                        }

                        for (cnt = full; cnt; cnt--)
                                *bp++ = bg;

                        if (rmask != -1)
                                *bp = (*bp & rmask) | rbg;

                        if (ri->ri_hwbits) {
                                memcpy(hp, rp, ((lmask != -1) + full +
                                    (rmask != -1)) << 2);
                                DELTA(hp, ri->ri_stride, uint32_t *);
                        }

                        DELTA(rp, ri->ri_stride, uint32_t *);
                }
        } else {
                clr[0] = bg & COLOR_MASK;
                clr[1] = fg & COLOR_MASK;

                while (height--) {
                        bp = rp;

#ifndef RASOPS_AA
                        uint32_t fb = rasops_be32uatoh(fr);
                        fr += ri->ri_font->stride;
#endif

                        if (lmask != -1) {
                                tmp = 0;
                                for (bit = col; bit < 32; bit += PIXEL_BITS)
                                        PIXEL_OR(tmp);
                                *bp = (*bp & lmask) | MBE(tmp);
                                bp++;
                        }

                        for (cnt = full; cnt; cnt--) {
                                tmp = 0;
                                for (bit = 0; bit < 32; bit += PIXEL_BITS)
                                        PIXEL_OR(tmp);
                                *bp++ = MBE(tmp);
                        }

                        if (rmask != -1) {
                                tmp = 0;
                                for (bit = 0; bit < width; bit += PIXEL_BITS)
                                        PIXEL_OR(tmp);
                                *bp = (*bp & rmask) | MBE(tmp);
                        }

                        if (ri->ri_hwbits) {
                                memcpy(hp, rp, ((lmask != -1) + full +
                                    (rmask != -1)) << 2);
                                DELTA(hp, ri->ri_stride, uint32_t *);
                        }

                        DELTA(rp, ri->ri_stride, uint32_t *);
                }
        }

        /* Do underline */
        if ((attr & WSATTR_UNDERLINE) != 0) {
                DELTA(rp, - ri->ri_stride * ri->ri_ul.off, uint32_t *);
                if (ri->ri_hwbits)
                        DELTA(hp, - ri->ri_stride * ri->ri_ul.off, uint32_t *);

                for (height = ri->ri_ul.height; height; height--) {
                        DELTA(rp, - ri->ri_stride, uint32_t *);
                        bp = rp;
                        if (lmask != -1) {
                                *bp = (*bp & lmask) | (fg & ~lmask);
                                bp++;
                        }
                        for (cnt = full; cnt; cnt--)
                                *bp++ = fg;
                        if (rmask != -1)
                                *bp = (*bp & rmask) | (fg & ~rmask);
                        if (ri->ri_hwbits) {
                                DELTA(hp, - ri->ri_stride, uint32_t *);
                                memcpy(hp, rp, ((lmask != -1) + full +
                                    (rmask != -1)) << 2);
                        }
                }
        }
}

#undef  PIXEL_BITS
#undef  PIXEL_SHIFT
#undef  COLOR_MASK

#undef  PIXEL_OR

#undef  NAME
#undef  NAME1