/*
 *  linux/drivers/video/console/fbcon_rotate.h -- Software Display 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.
 */

#ifndef _FBCON_ROTATE_H
#define _FBCON_ROTATE_H

#define GETVYRES(s,i) ({                           \
        (fb_scrollmode(s) == SCROLL_REDRAW || fb_scrollmode(s) == SCROLL_MOVE) ? \
        (i)->var.yres : (i)->var.yres_virtual; })

#define GETVXRES(s,i) ({                           \
        (fb_scrollmode(s) == SCROLL_REDRAW || fb_scrollmode(s) == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
        (i)->var.xres : (i)->var.xres_virtual; })


static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
{
        u32 tmp = (y * pitch) + x, index = tmp / 8,  bit = tmp % 8;

        pat +=index;
        return (*pat) & (0x80 >> bit);
}

static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
{
        u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;

        pat += index;

        (*pat) |= 0x80 >> bit;
}

static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
{
        int i, j;
        int shift = (8 - (width % 8)) & 7;

        width = (width + 7) & ~7;

        for (i = 0; i < height; i++) {
                for (j = 0; j < width - shift; j++) {
                        if (pattern_test_bit(j, i, width, in))
                                pattern_set_bit(width - (1 + j + shift),
                                                height - (1 + i),
                                                width, out);
                }

        }
}

static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
{
        int i, j, h = height, w = width;
        int shift = (8 - (height % 8)) & 7;

        width = (width + 7) & ~7;
        height = (height + 7) & ~7;

        for (i = 0; i < h; i++) {
                for (j = 0; j < w; j++) {
                        if (pattern_test_bit(j, i, width, in))
                                pattern_set_bit(height - 1 - i - shift, j,
                                                height, out);

                }
        }
}

static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
{
        int i, j, h = height, w = width;
        int shift = (8 - (width % 8)) & 7;

        width = (width + 7) & ~7;
        height = (height + 7) & ~7;

        for (i = 0; i < h; i++) {
                for (j = 0; j < w; j++) {
                        if (pattern_test_bit(j, i, width, in))
                                pattern_set_bit(i, width - 1 - j - shift,
                                                height, out);
                }
        }
}

int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc);

#if defined(CONFIG_FRAMEBUFFER_CONSOLE_ROTATION)
void fbcon_set_bitops_cw(struct fbcon_par *par);
void fbcon_set_bitops_ud(struct fbcon_par *par);
void fbcon_set_bitops_ccw(struct fbcon_par *par);
#else
static inline void fbcon_set_bitops_cw(struct fbcon_par *par)
{ }
static inline void fbcon_set_bitops_ud(struct fbcon_par *par)
{ }
static inline void fbcon_set_bitops_ccw(struct fbcon_par *par)
{ }
#endif

#endif