2 * linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation
4 * Copyright (C) 2005 Antonino Daplas <adaplas@pol.net>
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
11 #ifndef _FBCON_ROTATE_H
12 #define _FBCON_ROTATE_H
14 #define FNTCHARCNT(fd) (((int *)(fd))[-3])
16 #define GETVYRES(s,i) ({ \
17 (s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \
18 (i)->var.yres : (i)->var.yres_virtual; })
20 #define GETVXRES(s,i) ({ \
21 (s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
22 (i)->var.xres : (i)->var.xres_virtual; })
25 * The bitmap is always big endian
27 #if defined(__LITTLE_ENDIAN)
28 #define FBCON_BIT(b) (7 - (b))
30 #define FBCON_BIT(b) (b)
33 static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
35 u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
38 return (test_bit(FBCON_BIT(bit), (void *)pat));
41 static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
43 u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
46 set_bit(FBCON_BIT(bit), (void *)pat);
49 static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
52 int shift = (8 - (width % 8)) & 7;
54 width = (width + 7) & ~7;
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),
67 static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
69 int i, j, h = height, w = width;
70 int shift = (8 - (height % 8)) & 7;
72 width = (width + 7) & ~7;
73 height = (height + 7) & ~7;
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,
85 static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
87 int i, j, h = height, w = width;
88 int shift = (8 - (width % 8)) & 7;
90 width = (width + 7) & ~7;
91 height = (height + 7) & ~7;
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,
102 extern void fbcon_rotate_cw(struct fbcon_ops *ops);
103 extern void fbcon_rotate_ud(struct fbcon_ops *ops);
104 extern void fbcon_rotate_ccw(struct fbcon_ops *ops);