@@ -1485,7 +1485,25 @@ static int packedCopyWrapper(SwsContext *c, const uint8_t *src[],
#define DITHER_COPY(dst, dstStride, src, srcStride, bswap, dbswap)\
unsigned shift= src_depth-dst_depth, tmp;\
- if (shiftonly) {\
+ if (c->dither == SWS_DITHER_NONE) {\
+ for (i = 0; i < height; i++) {\
+ for (j = 0; j < length-7; j+=8) {\
+ dst[j+0] = dbswap(bswap(src[j+0])>>shift);\
+ dst[j+1] = dbswap(bswap(src[j+1])>>shift);\
+ dst[j+2] = dbswap(bswap(src[j+2])>>shift);\
+ dst[j+3] = dbswap(bswap(src[j+3])>>shift);\
+ dst[j+4] = dbswap(bswap(src[j+4])>>shift);\
+ dst[j+5] = dbswap(bswap(src[j+5])>>shift);\
+ dst[j+6] = dbswap(bswap(src[j+6])>>shift);\
+ dst[j+7] = dbswap(bswap(src[j+7])>>shift);\
+ }\
+ for (; j < length; j++) {\
+ dst[j] = dbswap(bswap(src[j])>>shift);\
+ }\
+ dst += dstStride;\
+ src += srcStride;\
+ }\
+ } else if (shiftonly) {\
for (i = 0; i < height; i++) {\
const uint8_t *dither= dithers[shift-1][i&7];\
for (j = 0; j < length-7; j+=8) {\
This patch uses dithering in DITHER_COPY macro only if it was not used option '-sws_dither none'. With option '-sws_dither none' it uses downshift. For human eye dithering is OK, for video codecs not necessarily. If user don't want to use dithering, we should respect that. Signed-off-by: Mateusz Brzostek <mateuszb@poczta.onet.pl> --- libswscale/swscale_unscaled.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-)