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[PATCH] fbdev: Shift pixel value before entering loop in cfbimageblit 

In slow imageblit, the pixel value is shifted by a certain amount (dependent
on the bpp and endianness) for each iteration.  This is inefficient.  Better
do the shifting once before going into the loop.

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 2005-12-12 22:17:20 -08:00 committed by Linus Torvalds
parent 39942fd8ff
commit 7275b4b6bc
1 changed files with 2 additions and 1 deletions
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3
drivers/video/cfbimgblt.c
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@ -162,6 +162,8 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info *
u32 i, j, l;
dst2 = (u32 __iomem *) dst1;
fgcolor <<= LEFT_POS(bpp);
bgcolor <<= LEFT_POS(bpp);
for (i = image->height; i--; ) {
shift = val = 0;
@ -180,7 +182,6 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info *
while (j--) {
l--;
color = (*s & 1 << (BIT_NR(l))) ? fgcolor : bgcolor;
color <<= LEFT_POS(bpp);
val |= SHIFT_HIGH(color, shift);
/* Did the bitshift spill bits to the next long? */