mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
93274e4d4e
Fix the rotate_ud() function not to crash in case of a font which has not a width of multiple by 8: The inner loop of the font pixel copy should not access a bit outside the font memory area. Subtract the shift offset from the font width will prevent this. Signed-off-by: Stefani Seibold <stefani@seibold.net> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/*
|
|
* 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 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; })
|
|
|
|
|
|
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 (*pat) & (0x80 >> bit);
|
|
}
|
|
|
|
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;
|
|
|
|
(*pat) |= 0x80 >> bit;
|
|
}
|
|
|
|
static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
|
|
{
|
|
int i, j;
|
|
int shift = (8 - (width % 8)) & 7;
|
|
|
|
width = (width + 7) & ~7;
|
|
|
|
for (i = 0; i < height; i++) {
|
|
for (j = 0; j < width - shift; 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 = (8 - (width % 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(i, width - 1 - j - shift,
|
|
height, out);
|
|
}
|
|
}
|
|
}
|
|
|
|
extern void fbcon_rotate_cw(struct fbcon_ops *ops);
|
|
extern void fbcon_rotate_ud(struct fbcon_ops *ops);
|
|
extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
|
|
#endif
|