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Antonino A. Daplas6cc50e12005-11-08 21:39:11 -08001/*
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 FNTCHARCNT(fd) (((int *)(fd))[-3])
15
16#define GETVYRES(s,i) ({ \
17 (s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \
18 (i)->var.yres : (i)->var.yres_virtual; })
19
20#define GETVXRES(s,i) ({ \
21 (s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
22 (i)->var.xres : (i)->var.xres_virtual; })
23
24/*
25 * The bitmap is always big endian
26 */
27#if defined(__LITTLE_ENDIAN)
28#define FBCON_BIT(b) (7 - (b))
29#else
30#define FBCON_BIT(b) (b)
31#endif
32
33static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
34{
35 u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
36
37 pat +=index;
38 return (test_bit(FBCON_BIT(bit), (void *)pat));
39}
40
41static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
42{
43 u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
44
45 pat += index;
46 set_bit(FBCON_BIT(bit), (void *)pat);
47}
48
49static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
50{
51 int i, j;
Antonino A. Daplasb4627de2005-11-21 21:32:25 -080052 int shift = (8 - (width % 8)) & 7;
Antonino A. Daplas6cc50e12005-11-08 21:39:11 -080053
54 width = (width + 7) & ~7;
55
56 for (i = 0; i < height; i++) {
57 for (j = 0; j < width; j++) {
58 if (pattern_test_bit(j, i, width, in))
59 pattern_set_bit(width - (1 + j + shift),
60 height - (1 + i),
61 width, out);
62 }
63
64 }
65}
66
67static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
68{
69 int i, j, h = height, w = width;
70 int shift = (8 - (height % 8)) & 7;
71
72 width = (width + 7) & ~7;
73 height = (height + 7) & ~7;
74
75 for (i = 0; i < h; i++) {
76 for (j = 0; j < w; j++) {
77 if (pattern_test_bit(j, i, width, in))
78 pattern_set_bit(height - 1 - i - shift, j,
79 height, out);
80
81 }
82 }
83}
84
85static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
86{
87 int i, j, h = height, w = width;
Antonino A. Daplasb4627de2005-11-21 21:32:25 -080088 int shift = (8 - (width % 8)) & 7;
Antonino A. Daplas6cc50e12005-11-08 21:39:11 -080089
90 width = (width + 7) & ~7;
91 height = (height + 7) & ~7;
92
93 for (i = 0; i < h; i++) {
94 for (j = 0; j < w; j++) {
95 if (pattern_test_bit(j, i, width, in))
96 pattern_set_bit(i, width - 1 - j - shift,
97 height, out);
98 }
99 }
100}
101
Antonino A. Daplasdbcbfe12005-11-08 21:39:12 -0800102extern void fbcon_rotate_cw(struct fbcon_ops *ops);
Antonino A. Daplas33ee8292005-11-08 21:39:13 -0800103extern void fbcon_rotate_ud(struct fbcon_ops *ops);
Antonino A. Daplased8c0e92005-11-08 21:39:14 -0800104extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
Antonino A. Daplas6cc50e12005-11-08 21:39:11 -0800105#endif