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
pattern_test_bit(u32 x,u32 y,u32 pitch,const char * pat)14 static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
15 {
16 u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
17
18 pat +=index;
19 return (*pat) & (0x80 >> bit);
20 }
21
pattern_set_bit(u32 x,u32 y,u32 pitch,char * pat)22 static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
23 {
24 u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
25
26 pat += index;
27
28 (*pat) |= 0x80 >> bit;
29 }
30
rotate_ud(const char * in,char * out,u32 width,u32 height)31 static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
32 {
33 int i, j;
34 int shift = (8 - (width % 8)) & 7;
35
36 width = (width + 7) & ~7;
37
38 for (i = 0; i < height; i++) {
39 for (j = 0; j < width - shift; j++) {
40 if (pattern_test_bit(j, i, width, in))
41 pattern_set_bit(width - (1 + j + shift),
42 height - (1 + i),
43 width, out);
44 }
45
46 }
47 }
48
rotate_cw(const char * in,char * out,u32 width,u32 height)49 static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
50 {
51 int i, j, h = height, w = width;
52 int shift = (8 - (height % 8)) & 7;
53
54 width = (width + 7) & ~7;
55 height = (height + 7) & ~7;
56
57 for (i = 0; i < h; i++) {
58 for (j = 0; j < w; j++) {
59 if (pattern_test_bit(j, i, width, in))
60 pattern_set_bit(height - 1 - i - shift, j,
61 height, out);
62
63 }
64 }
65 }
66
rotate_ccw(const char * in,char * out,u32 width,u32 height)67 static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
68 {
69 int i, j, h = height, w = width;
70 int shift = (8 - (width % 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(i, width - 1 - j - shift,
79 height, out);
80 }
81 }
82 }
83
84 extern void fbcon_rotate_cw(struct fbcon_ops *ops);
85 extern void fbcon_rotate_ud(struct fbcon_ops *ops);
86 extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
87 #endif
88