/*
 *  linux/drivers/video/console/fbcon_rotate.c -- Software Rotation
 *
 *      Copyright (C) 2005 Antonino Daplas <adaplas @pol.net>
 *
 *  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/slab.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <asm/types.h>
#include "fbcon.h"
#include "fbcon_rotate.h"

int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc)
{
        struct fbcon_par *par = info->fbcon_par;
        int len, err = 0;
        int s_cellsize, d_cellsize, i;
        const u8 *src;
        u8 *dst;

        if (vc->vc_font.data == par->fontdata &&
            par->p->con_rotate == par->cur_rotate)
                goto finished;

        src = par->fontdata = vc->vc_font.data;
        par->cur_rotate = par->p->con_rotate;
        len = vc->vc_font.charcount;
        s_cellsize = ((vc->vc_font.width + 7)/8) *
                vc->vc_font.height;
        d_cellsize = s_cellsize;

        if (par->rotate == FB_ROTATE_CW ||
            par->rotate == FB_ROTATE_CCW)
                d_cellsize = ((vc->vc_font.height + 7)/8) *
                        vc->vc_font.width;

        if (info->fbops->fb_sync)
                info->fbops->fb_sync(info);

        if (par->fd_size < d_cellsize * len) {
                dst = kmalloc_array(len, d_cellsize, GFP_KERNEL);

                if (dst == NULL) {
                        err = -ENOMEM;
                        goto finished;
                }

                par->fd_size = d_cellsize * len;
                kfree(par->fontbuffer);
                par->fontbuffer = dst;
        }

        dst = par->fontbuffer;
        memset(dst, 0, par->fd_size);

        switch (par->rotate) {
        case FB_ROTATE_UD:
                for (i = len; i--; ) {
                        rotate_ud(src, dst, vc->vc_font.width,
                                  vc->vc_font.height);

                        src += s_cellsize;
                        dst += d_cellsize;
                }
                break;
        case FB_ROTATE_CW:
                for (i = len; i--; ) {
                        rotate_cw(src, dst, vc->vc_font.width,
                                  vc->vc_font.height);
                        src += s_cellsize;
                        dst += d_cellsize;
                }
                break;
        case FB_ROTATE_CCW:
                for (i = len; i--; ) {
                        rotate_ccw(src, dst, vc->vc_font.width,
                                   vc->vc_font.height);
                        src += s_cellsize;
                        dst += d_cellsize;
                }
                break;
        }

finished:
        return err;
}