ed8c0e99f2
Add support for 270-degree (counterclockwise) rotation of the console. To activate, boot with: fbcon=rotate:3 Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/*
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* linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation
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*
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* Copyright (C) 2005 Antonino Daplas <adaplas@pol.net>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#ifndef _FBCON_ROTATE_H
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#define _FBCON_ROTATE_H
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#define FNTCHARCNT(fd) (((int *)(fd))[-3])
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#define GETVYRES(s,i) ({ \
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(s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \
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(i)->var.yres : (i)->var.yres_virtual; })
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#define GETVXRES(s,i) ({ \
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(s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
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(i)->var.xres : (i)->var.xres_virtual; })
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/*
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* The bitmap is always big endian
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*/
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#if defined(__LITTLE_ENDIAN)
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#define FBCON_BIT(b) (7 - (b))
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#else
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#define FBCON_BIT(b) (b)
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#endif
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static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
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{
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u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
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pat +=index;
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return (test_bit(FBCON_BIT(bit), (void *)pat));
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}
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static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
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{
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u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
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pat += index;
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set_bit(FBCON_BIT(bit), (void *)pat);
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}
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static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
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{
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int i, j;
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int shift = width % 8;
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width = (width + 7) & ~7;
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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if (pattern_test_bit(j, i, width, in))
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pattern_set_bit(width - (1 + j + shift),
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height - (1 + i),
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width, out);
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}
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}
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}
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static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
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{
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int i, j, h = height, w = width;
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int shift = (8 - (height % 8)) & 7;
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width = (width + 7) & ~7;
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height = (height + 7) & ~7;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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if (pattern_test_bit(j, i, width, in))
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pattern_set_bit(height - 1 - i - shift, j,
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height, out);
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}
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}
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}
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static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
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{
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int i, j, h = height, w = width;
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int shift = width % 8;
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width = (width + 7) & ~7;
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height = (height + 7) & ~7;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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if (pattern_test_bit(j, i, width, in))
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pattern_set_bit(i, width - 1 - j - shift,
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height, out);
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}
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}
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}
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extern void fbcon_rotate_cw(struct fbcon_ops *ops);
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extern void fbcon_rotate_ud(struct fbcon_ops *ops);
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extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
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#endif
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