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
pattern_test_bit(u32 x,u32 y,u32 pitch,const char * pat)23 static 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
pattern_set_bit(u32 x,u32 y,u32 pitch,char * pat)31 static 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
rotate_ud(const char * in,char * out,u32 width,u32 height)40 static 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
rotate_cw(const char * in,char * out,u32 width,u32 height)58 static 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
rotate_ccw(const char * in,char * out,u32 width,u32 height)76 static 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
93 extern void fbcon_rotate_cw(struct fbcon_ops *ops);
94 extern void fbcon_rotate_ud(struct fbcon_ops *ops);
95 extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
96 #endif
97