diff options
| author | Pavel Pisa <pisa@cmp.felk.cvut.cz> | 2007-10-16 12:29:55 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 20:43:23 +0400 |
| commit | 15afdd433610c4ba0edf1f8a59915b3755af7365 (patch) | |
| tree | 0e59d4eeb2e66af72a4b1a1fead29fa362826792 /drivers/video/fb_draw.h | |
| parent | c3ca34f90b44049dcde62a8f97554409112bf376 (diff) | |
| download | linux-15afdd433610c4ba0edf1f8a59915b3755af7365.tar.xz | |
fbdev: copyarea function taught to fully support swapped pixel order in byte
This correct case, when source and destination X coordinates difference is n
multiple of pixels in byte. This is probably rare case, but this case should
supported for completeness.
Reorganization of FB_READL and FB_WRITEL calls results in code size decrease
for normal build without swapping support and size with support enabled is
reasonable too.
[adaplas]
Add missing fb_rev_pixels_in_long() prototype.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/fb_draw.h')
| -rw-r--r-- | drivers/video/fb_draw.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/video/fb_draw.h b/drivers/video/fb_draw.h index 816843f06bb7..cdafbe14ef1f 100644 --- a/drivers/video/fb_draw.h +++ b/drivers/video/fb_draw.h @@ -72,6 +72,26 @@ pixel_to_pat( u32 bpp, u32 pixel) #endif #ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE +#if BITS_PER_LONG == 64 +#define REV_PIXELS_MASK1 0x5555555555555555ul +#define REV_PIXELS_MASK2 0x3333333333333333ul +#define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful +#else +#define REV_PIXELS_MASK1 0x55555555ul +#define REV_PIXELS_MASK2 0x33333333ul +#define REV_PIXELS_MASK4 0x0f0f0f0ful +#endif + +static inline unsigned long fb_rev_pixels_in_long(unsigned long val, + u32 bswapmask) +{ + if (bswapmask & 1) + val = comp(val >> 1, val << 1, REV_PIXELS_MASK1); + if (bswapmask & 2) + val = comp(val >> 2, val << 2, REV_PIXELS_MASK2); + if (bswapmask & 3) + val = comp(val >> 4, val << 4, REV_PIXELS_MASK4); +} static inline u32 fb_shifted_pixels_mask_u32(u32 index, u32 bswapmask) { @@ -131,6 +151,12 @@ static inline u32 fb_compute_bswapmask(struct fb_info *info) #else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */ +static inline unsigned long fb_rev_pixels_in_long(unsigned long val, + u32 bswapmask) +{ + return val; +} + #define fb_shifted_pixels_mask_u32(i, b) FB_SHIFT_HIGH(~(u32)0, (i)) #define fb_shifted_pixels_mask_long(i, b) FB_SHIFT_HIGH(~0UL, (i)) #define fb_compute_bswapmask(...) 0 |