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lavfi/gradfun: fix dithering in MMX code. 

Current dithering only uses the first 4 instead of the whole 8 random values.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Clément Bœsch 2012-12-07 00:39:31 +01:00 committed by Anton Khirnov
parent 2d66fc543b
commit 38a2f88d39
1 changed files with 29 additions and 2 deletions
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31
libavfilter/x86/vf_gradfun.c
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@ -46,8 +46,33 @@ static void gradfun_filter_line_mmxext(uint8_t *dst, uint8_t *src, uint16_t *dc,
"pxor %%mm7, %%mm7 \n"
"pshufw $0, %%mm5, %%mm5 \n"
"movq %6, %%mm6 \n"
"movq %5, %%mm4 \n"
"movq (%5), %%mm3 \n"
"movq 8(%5), %%mm4 \n"
"1: \n"
"movd (%2,%0), %%mm0 \n"
"movd (%3,%0), %%mm1 \n"
"punpcklbw %%mm7, %%mm0 \n"
"punpcklwd %%mm1, %%mm1 \n"
"psllw $7, %%mm0 \n"
"pxor %%mm2, %%mm2 \n"
"psubw %%mm0, %%mm1 \n" // delta = dc - pix
"psubw %%mm1, %%mm2 \n"
"pmaxsw %%mm1, %%mm2 \n"
"pmulhuw %%mm5, %%mm2 \n" // m = abs(delta) * thresh >> 16
"psubw %%mm6, %%mm2 \n"
"pminsw %%mm7, %%mm2 \n" // m = -max(0, 127-m)
"pmullw %%mm2, %%mm2 \n"
"paddw %%mm3, %%mm0 \n" // pix += dither
"psllw $2, %%mm1 \n" // m = m*m*delta >> 14
"pmulhw %%mm2, %%mm1 \n"
"paddw %%mm1, %%mm0 \n" // pix += m
"psraw $7, %%mm0 \n"
"packuswb %%mm0, %%mm0 \n"
"movd %%mm0, (%1,%0) \n" // dst = clip(pix>>7)
"add $4, %0 \n"
"jnl 2f \n"
"movd (%2,%0), %%mm0 \n"
"movd (%3,%0), %%mm1 \n"
"punpcklbw %%mm7, %%mm0 \n"
@ -70,10 +95,12 @@ static void gradfun_filter_line_mmxext(uint8_t *dst, uint8_t *src, uint16_t *dc,
"movd %%mm0, (%1,%0) \n" // dst = clip(pix>>7)
"add $4, %0 \n"
"jl 1b \n"
"2: \n"
"emms \n"
:"+r"(x)
:"r"(dst+width), "r"(src+width), "r"(dc+width/2),
"rm"(thresh), "m"(*dithers), "m"(*pw_7f)
"rm"(thresh), "r"(dithers), "m"(*pw_7f)
:"memory"
);
}