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swscale: factor shift out of DITHER_COPY().

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-05-09 22:02:44 +02:00
parent 300e497b5f
commit 9c49ca0f19
1 changed files with 10 additions and 9 deletions
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19
libswscale/swscale.c
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@ -1859,19 +1859,20 @@ static int packedCopyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[
#define DITHER_COPY(dst, dstStride, src, srcStride)\
for (i = 0; i < height; i++) {\
int shift= src_depth-dst_depth;\
uint8_t *dither= dithers[src_depth-9][i&7];\
for (j = 0; j < length-7; j+=8){\
dst[j+0] = (src[j+0] + dither[0])>>(src_depth-dst_depth);\
dst[j+1] = (src[j+1] + dither[1])>>(src_depth-dst_depth);\
dst[j+2] = (src[j+2] + dither[2])>>(src_depth-dst_depth);\
dst[j+3] = (src[j+3] + dither[3])>>(src_depth-dst_depth);\
dst[j+4] = (src[j+4] + dither[4])>>(src_depth-dst_depth);\
dst[j+5] = (src[j+5] + dither[5])>>(src_depth-dst_depth);\
dst[j+6] = (src[j+6] + dither[6])>>(src_depth-dst_depth);\
dst[j+7] = (src[j+7] + dither[7])>>(src_depth-dst_depth);\
dst[j+0] = (src[j+0] + dither[0])>>shift;\
dst[j+1] = (src[j+1] + dither[1])>>shift;\
dst[j+2] = (src[j+2] + dither[2])>>shift;\
dst[j+3] = (src[j+3] + dither[3])>>shift;\
dst[j+4] = (src[j+4] + dither[4])>>shift;\
dst[j+5] = (src[j+5] + dither[5])>>shift;\
dst[j+6] = (src[j+6] + dither[6])>>shift;\
dst[j+7] = (src[j+7] + dither[7])>>shift;\
}\
for (; j < length; j++)\
dst[j] = (src[j] + dither[j&7])>>(src_depth-dst_depth);\
dst[j] = (src[j] + dither[j&7])>>shift;\
dst += dstStride;\
src += srcStride;\
}