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fbcon_rotate.h
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1 /*
2  * linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation
3  *
4  * Copyright (C) 2005 Antonino Daplas <[email protected]>
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 
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 
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 
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 - shift; 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;
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