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| author | Antonino A. Daplas <adaplas@gmail.com> | 2005-11-21 21:32:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-22 09:13:43 -0800 |
| commit | b4627dea032ab1f6e472fcf030e28f22ea971f9b (patch) | |
| tree | cf4a6509616f137e46098bbbb0573194b4ef0af5 /drivers/video | |
| parent | 74a8a65c526187fe636a6a2abcb7d9ebc5c753ab (diff) | |
| download | linux-b4627dea032ab1f6e472fcf030e28f22ea971f9b.tar.gz linux-b4627dea032ab1f6e472fcf030e28f22ea971f9b.tar.bz2 linux-b4627dea032ab1f6e472fcf030e28f22ea971f9b.zip | |
[PATCH] fbcon: Console Rotation - Fix wrong shift calculation
The shift value (amount to shift the bitmap so first pixel starts at
origin(0,0)) is incorrect. This causes corrupted characters or a kernel crash
if fontwidth is not divisible by 8 at 270 degrees, or fontheight not divisible
by 8 at 180 degrees.
Report and part of the fix contributed by Knut Petersen.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/console/fbcon_rotate.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/video/console/fbcon_rotate.h b/drivers/video/console/fbcon_rotate.h index 90c672096c2e..e504fbf5c604 100644 --- a/drivers/video/console/fbcon_rotate.h +++ b/drivers/video/console/fbcon_rotate.h @@ -49,7 +49,7 @@ static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat) static inline void rotate_ud(const char *in, char *out, u32 width, u32 height) { int i, j; - int shift = width % 8; + int shift = (8 - (width % 8)) & 7; width = (width + 7) & ~7; @@ -85,7 +85,7 @@ static inline void rotate_cw(const char *in, char *out, u32 width, u32 height) 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; + int shift = (8 - (width % 8)) & 7; width = (width + 7) & ~7; height = (height + 7) & ~7; |