1/*
2 *  linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation
3 *
4 *	Copyright (C) 2005 Antonino Daplas <adaplas@pol.net>
5 *
6 *  This file is subject to the terms and conditions of the GNU General Public
7 *  License.  See the file COPYING in the main directory of this archive
8 *  for more details.
9 */
10
11#ifndef _FBCON_ROTATE_H
12#define _FBCON_ROTATE_H
13
14#define GETVYRES(s,i) ({                           \
15        (s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \
16        (i)->var.yres : (i)->var.yres_virtual; })
17
18#define GETVXRES(s,i) ({                           \
19        (s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
20        (i)->var.xres : (i)->var.xres_virtual; })
21
22
23static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
24{
25	u32 tmp = (y * pitch) + x, index = tmp / 8,  bit = tmp % 8;
26
27	pat +=index;
28	return (*pat) & (0x80 >> bit);
29}
30
31static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
32{
33	u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
34
35	pat += index;
36
37	(*pat) |= 0x80 >> bit;
38}
39
40static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
41{
42	int i, j;
43	int shift = (8 - (width % 8)) & 7;
44
45	width = (width + 7) & ~7;
46
47	for (i = 0; i < height; i++) {
48		for (j = 0; j < width; j++) {
49			if (pattern_test_bit(j, i, width, in))
50				pattern_set_bit(width - (1 + j + shift),
51						height - (1 + i),
52						width, out);
53		}
54
55	}
56}
57
58static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
59{
60	int i, j, h = height, w = width;
61	int shift = (8 - (height % 8)) & 7;
62
63	width = (width + 7) & ~7;
64	height = (height + 7) & ~7;
65
66	for (i = 0; i < h; i++) {
67		for (j = 0; j < w; j++) {
68			if (pattern_test_bit(j, i, width, in))
69				pattern_set_bit(height - 1 - i - shift, j,
70						height, out);
71
72		}
73	}
74}
75
76static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
77{
78	int i, j, h = height, w = width;
79	int shift = (8 - (width % 8)) & 7;
80
81	width = (width + 7) & ~7;
82	height = (height + 7) & ~7;
83
84	for (i = 0; i < h; i++) {
85		for (j = 0; j < w; j++) {
86			if (pattern_test_bit(j, i, width, in))
87				pattern_set_bit(i, width - 1 - j - shift,
88						height, out);
89		}
90	}
91}
92
93extern void fbcon_rotate_cw(struct fbcon_ops *ops);
94extern void fbcon_rotate_ud(struct fbcon_ops *ops);
95extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
96#endif
97