/*
 * linux/drivers/video/console/softcursor.c
 *
 * Generic software cursor for frame buffer devices
 *
 *  Created 14 Nov 2002 by James Simmons
 *
 * 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 <linux/slab.h>

#include <asm/io.h>

#include "fbcon.h"

int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
        struct fbcon_par *par = info->fbcon_par;
        unsigned int scan_align = info->pixmap.scan_align - 1;
        unsigned int buf_align = info->pixmap.buf_align - 1;
        unsigned int i, size, dsize, s_pitch, d_pitch;
        struct fb_image *image;
        u8 *src, *dst;

        if (info->state != FBINFO_STATE_RUNNING)
                return 0;

        s_pitch = (cursor->image.width + 7) >> 3;
        dsize = s_pitch * cursor->image.height;

        if (dsize + sizeof(struct fb_image) != par->cursor_size) {
                kfree(par->cursor_src);
                par->cursor_size = dsize + sizeof(struct fb_image);

                par->cursor_src = kmalloc(par->cursor_size, GFP_ATOMIC);
                if (!par->cursor_src) {
                        par->cursor_size = 0;
                        return -ENOMEM;
                }
        }

        src = par->cursor_src + sizeof(struct fb_image);
        image = (struct fb_image *)par->cursor_src;
        *image = cursor->image;
        d_pitch = (s_pitch + scan_align) & ~scan_align;

        size = d_pitch * image->height + buf_align;
        size &= ~buf_align;
        dst = fb_get_buffer_offset(info, &info->pixmap, size);

        if (cursor->enable) {
                switch (cursor->rop) {
                case ROP_XOR:
                        for (i = 0; i < dsize; i++)
                                src[i] = image->data[i] ^ cursor->mask[i];
                        break;
                case ROP_COPY:
                default:
                        for (i = 0; i < dsize; i++)
                                src[i] = image->data[i] & cursor->mask[i];
                        break;
                }
        } else
                memcpy(src, image->data, dsize);

        fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, image->height);
        image->data = dst;
        info->fbops->fb_imageblit(info, image);
        return 0;
}