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/*

 *  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) ({                           \

        (s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \

        (i)->var.yres : (i)->var.yres_virtual; })

#define GETVXRES(s,i) ({                           \

        (s == SCROLL_REDRAW || 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; 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);

                }

        }

}

extern void fbcon_rotate_cw(struct fbcon_ops *ops);

extern void fbcon_rotate_ud(struct fbcon_ops *ops);

extern void fbcon_rotate_ccw(struct fbcon_ops *ops);

#endif