/*
 *  linux/drivers/video/mfb.c -- Low level frame buffer operations for
 *                               monochrome
 *
 *      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/string.h>
#include <linux/fb.h>

#include "atafb.h"
#include "atafb_utils.h"


    /*
     *  Monochrome
     */

void atafb_mfb_copyarea(struct fb_info *info, u_long next_line,
                        int sy, int sx, int dy, int dx,
                        int height, int width)
{
        u8 *src, *dest;
        u_int rows;

        if (sx == 0 && dx == 0 && width == next_line) {
                src = (u8 *)info->screen_base + sy * (width >> 3);
                dest = (u8 *)info->screen_base + dy * (width >> 3);
                fb_memmove(dest, src, height * (width >> 3));
        } else if (dy <= sy) {
                src = (u8 *)info->screen_base + sy * next_line + (sx >> 3);
                dest = (u8 *)info->screen_base + dy * next_line + (dx >> 3);
                for (rows = height; rows--;) {
                        fb_memmove(dest, src, width >> 3);
                        src += next_line;
                        dest += next_line;
                }
        } else {
                src = (u8 *)info->screen_base + (sy + height - 1) * next_line + (sx >> 3);
                dest = (u8 *)info->screen_base + (dy + height - 1) * next_line + (dx >> 3);
                for (rows = height; rows--;) {
                        fb_memmove(dest, src, width >> 3);
                        src -= next_line;
                        dest -= next_line;
                }
        }
}

void atafb_mfb_fillrect(struct fb_info *info, u_long next_line, u32 color,
                        int sy, int sx, int height, int width)
{
        u8 *dest;
        u_int rows;

        dest = (u8 *)info->screen_base + sy * next_line + (sx >> 3);

        if (sx == 0 && width == next_line) {
                if (color)
                        fb_memset255(dest, height * (width >> 3));
                else
                        fb_memclear(dest, height * (width >> 3));
        } else {
                for (rows = height; rows--; dest += next_line) {
                        if (color)
                                fb_memset255(dest, width >> 3);
                        else
                                fb_memclear_small(dest, width >> 3);
                }
        }
}

void atafb_mfb_linefill(struct fb_info *info, u_long next_line,
                        int dy, int dx, u32 width,
                        const u8 *data, u32 bgcolor, u32 fgcolor)
{
        u8 *dest;
        u_int rows;

        dest = (u8 *)info->screen_base + dy * next_line + (dx >> 3);

        for (rows = width / 8; rows--; /* check margins */ ) {
                // use fast_memmove or fb_memmove
                *dest++ = *data++;
        }
}