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[PATCH] fbcon: Console Rotation - Add support to rotate font bitmap

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Add support to rotate the font bitmap.  To save on processing time, the entire
fontdata will be rotated on a console switch, then stored in a buffer private
to fbcon.  To further save on processing, the fontdata will only be rotated if
the font has changed or if the angle of rotation has changed.  Only a single
copy of the rotated fontdata will be kept.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Antonino A. Daplas
2005-11-08 21:39:11 -08:00
committed by Linus Torvalds
parent 9c44e5f6c2
commit 6cc50e1c5b
4 changed files with 214 additions and 0 deletions
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102
drivers/video/console/fbcon_rotate.h Normal file
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/*
* linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation
*
* Copyright (C) 2005 Antonino Daplas <adaplas@pol.net>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#ifndef _FBCON_ROTATE_H
#define _FBCON_ROTATE_H
#define FNTCHARCNT(fd) (((int *)(fd))[-3])
#define GETVYRES(s,i) ({ \
(s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \
(i)->var.yres : (i)->var.yres_virtual; })
#define GETVXRES(s,i) ({ \
(s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
(i)->var.xres : (i)->var.xres_virtual; })
/*
* The bitmap is always big endian
*/
#if defined(__LITTLE_ENDIAN)
#define FBCON_BIT(b) (7 - (b))
#else
#define FBCON_BIT(b) (b)
#endif
static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
{
u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
pat +=index;
return (test_bit(FBCON_BIT(bit), (void *)pat));
}
static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
{
u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
pat += index;
set_bit(FBCON_BIT(bit), (void *)pat);
}
static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
{
int i, j;
int shift = width % 8;
width = (width + 7) & ~7;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
if (pattern_test_bit(j, i, width, in))
pattern_set_bit(width - (1 + j + shift),
height - (1 + i),
width, out);
}
}
}
static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
{
int i, j, h = height, w = width;
int shift = (8 - (height % 8)) & 7;
width = (width + 7) & ~7;
height = (height + 7) & ~7;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
if (pattern_test_bit(j, i, width, in))
pattern_set_bit(height - 1 - i - shift, j,
height, out);
}
}
}
static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
{
int i, j, h = height, w = width;
int shift = width % 8;
width = (width + 7) & ~7;
height = (height + 7) & ~7;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
if (pattern_test_bit(j, i, width, in))
pattern_set_bit(i, width - 1 - j - shift,
height, out);
}
}
}
#endif