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6cc50e1c AD |
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 | ||
6cc50e1c AD |
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 | ||
6cc50e1c AD |
22 | |
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; | |
1a9c3f78 | 28 | return (*pat) & (0x80 >> bit); |
6cc50e1c AD |
29 | } |
30 | ||
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; | |
1a9c3f78 BH |
36 | |
37 | (*pat) |= 0x80 >> bit; | |
6cc50e1c AD |
38 | } |
39 | ||
40 | static inline void rotate_ud(const char *in, char *out, u32 width, u32 height) | |
41 | { | |
42 | int i, j; | |
b4627dea | 43 | int shift = (8 - (width % 8)) & 7; |
6cc50e1c AD |
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 | ||
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 | ||
76 | static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height) | |
77 | { | |
78 | int i, j, h = height, w = width; | |
b4627dea | 79 | int shift = (8 - (width % 8)) & 7; |
6cc50e1c AD |
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 | ||
dbcbfe1e | 93 | extern void fbcon_rotate_cw(struct fbcon_ops *ops); |
33ee8297 | 94 | extern void fbcon_rotate_ud(struct fbcon_ops *ops); |
ed8c0e99 | 95 | extern void fbcon_rotate_ccw(struct fbcon_ops *ops); |
6cc50e1c | 96 | #endif |