atafb_iplan2p2.c

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/*
 *  linux/drivers/video/iplan2p2.c -- Low level frame buffer operations for
 *                    interleaved bitplanes à la Atari (2
 *                    planes, 2 bytes interleave)
 *
 *  Created 5 Apr 1997 by Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>

#include <asm/setup.h>

#include "atafb.h"

#define BPL 2
#include "atafb_utils.h"

void atafb_iplan2p2_copyarea(struct fb_info *info, u_long next_line,
                 int sy, int sx, int dy, int dx,
                 int height, int width)
{
    /*  bmove() has to distinguish two major cases: If both, source and
     *  destination, start at even addresses or both are at odd
     *  addresses, just the first odd and last even column (if present)
     *  require special treatment (memmove_col()). The rest between
     *  then can be copied by normal operations, because all adjacent
     *  bytes are affected and are to be stored in the same order.
     *    The pathological case is when the move should go from an odd
     *  address to an even or vice versa. Since the bytes in the plane
     *  words must be assembled in new order, it seems wisest to make
     *  all movements by memmove_col().
     */

    u8 *src, *dst;
    u32 *s, *d;
    int w, l , i, j;
    u_int colsize;
    u_int upwards = (dy < sy) || (dy == sy && dx < sx);

    colsize = height;
    if (!((sx ^ dx) & 15)) {
        /* odd->odd or even->even */

        if (upwards) {
            src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
            dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
            if (sx & 15) {
                memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
                src += BPL * 2;
                dst += BPL * 2;
                width -= 8;
            }
            w = width >> 4;
            if (w) {
                s = (u32 *)src;
                d = (u32 *)dst;
                w *= BPL / 2;
                l = next_line - w * 4;
                for (j = height; j > 0; j--) {
                    for (i = w; i > 0; i--)
                        *d++ = *s++;
                    s = (u32 *)((u8 *)s + l);
                    d = (u32 *)((u8 *)d + l);
                }
            }
            if (width & 15)
                memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
                          0xff00ff00, height, next_line - BPL * 2);
        } else {
            src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
            dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);

            if ((sx + width) & 15) {
                src -= BPL * 2;
                dst -= BPL * 2;
                memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
                width -= 8;
            }
            w = width >> 4;
            if (w) {
                s = (u32 *)src;
                d = (u32 *)dst;
                w *= BPL / 2;
                l = next_line - w * 4;
                for (j = height; j > 0; j--) {
                    for (i = w; i > 0; i--)
                        *--d = *--s;
                    s = (u32 *)((u8 *)s - l);
                    d = (u32 *)((u8 *)d - l);
                }
            }
            if (sx & 15)
                memmove32_col(dst - (width - 16) / (8 / BPL),
                          src - (width - 16) / (8 / BPL),
                          0xff00ff, colsize, -next_line - BPL * 2);
        }
    } else {
        /* odd->even or even->odd */
        if (upwards) {
            u32 *src32, *dst32;
            u32 pval[4], v, v1, mask;
            int i, j, w, f;

            src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
            dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);

            mask = 0xff00ff00;
            f = 0;
            w = width;
            if (sx & 15) {
                f = 1;
                w += 8;
            }
            if ((sx + width) & 15)
                f |= 2;
            w >>= 4;
            for (i = height; i; i--) {
                src32 = (u32 *)src;
                dst32 = (u32 *)dst;

                if (f & 1) {
                    pval[0] = (*src32++ << 8) & mask;
                } else {
                    pval[0] = dst32[0] & mask;
                }

                for (j = w; j > 0; j--) {
                    v = *src32++;
                    v1 = v & mask;
                    *dst32++ = pval[0] | (v1 >> 8);
                    pval[0] = (v ^ v1) << 8;
                }

                if (f & 2) {
                    dst32[0] = (dst32[0] & mask) | pval[0];
                }

                src += next_line;
                dst += next_line;
            }
        } else {
            u32 *src32, *dst32;
            u32 pval[4], v, v1, mask;
            int i, j, w, f;

            src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
            dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);

            mask = 0xff00ff;
            f = 0;
            w = width;
            if ((dx + width) & 15)
                f = 1;
            if (sx & 15) {
                f |= 2;
                w += 8;
            }
            w >>= 4;
            for (i = height; i; i--) {
                src32 = (u32 *)src;
                dst32 = (u32 *)dst;

                if (f & 1) {
                    pval[0] = dst32[-1] & mask;
                } else {
                    pval[0] = (*--src32 >> 8) & mask;
                }

                for (j = w; j > 0; j--) {
                    v = *--src32;
                    v1 = v & mask;
                    *--dst32 = pval[0] | (v1 << 8);
                    pval[0] = (v ^ v1) >> 8;
                }

                if (!(f & 2)) {
                    dst32[-1] = (dst32[-1] & mask) | pval[0];
                }

                src -= next_line;
                dst -= next_line;
            }
        }
    }
}

void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color,
                             int sy, int sx, int height, int width)
{
    u32 *dest;
    int rows, i;
    u32 cval[4];

    dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
    if (sx & 15) {
        u8 *dest8 = (u8 *)dest + 1;

        expand8_col2mask(color, cval);

        for (i = height; i; i--) {
            fill8_col(dest8, cval);
            dest8 += next_line;
        }
        dest += BPL / 2;
        width -= 8;
    }

    expand16_col2mask(color, cval);
    rows = width >> 4;
    if (rows) {
        u32 *d = dest;
        u32 off = next_line - rows * BPL * 2;
        for (i = height; i; i--) {
            d = fill16_col(d, rows, cval);
            d = (u32 *)((long)d + off);
        }
        dest += rows * BPL / 2;
        width &= 15;
    }

    if (width) {
        u8 *dest8 = (u8 *)dest;

        expand8_col2mask(color, cval);

        for (i = height; i; i--) {
            fill8_col(dest8, cval);
            dest8 += next_line;
        }
    }
}

void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line,
                             int dy, int dx, u32 width,
                             const u8 *data, u32 bgcolor, u32 fgcolor)
{
    u32 *dest;
    const u16 *data16;
    int rows;
    u32 fgm[4], bgm[4], m;

    dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
    if (dx & 15) {
        fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
        dest += BPL / 2;
        width -= 8;
    }

    if (width >= 16) {
        data16 = (const u16 *)data;
        expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);

        for (rows = width / 16; rows; rows--) {
            u16 d = *data16++;
            m = d | ((u32)d << 16);
            *dest++ = (m & fgm[0]) ^ bgm[0];
        }

        data = (const u8 *)data16;
        width &= 15;
    }

    if (width)
        fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
}

#ifdef MODULE
MODULE_LICENSE("GPL");

int init_module(void)
{
    return 0;
}

void cleanup_module(void)
{
}
#endif /* MODULE */


    /*
     *  Visible symbols for modules
     */

EXPORT_SYMBOL(atafb_iplan2p2_copyarea);
EXPORT_SYMBOL(atafb_iplan2p2_fillrect);
EXPORT_SYMBOL(atafb_iplan2p2_linefill);