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swscale: avoid reading prior to the source buffer in planar2x() MMX2

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Originally committed as revision 32221 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
oldabi
Ramiro Polla 14 years ago
parent b3555bf08a
commit 6527e56131
2 changed files with 15 additions and 3 deletions
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  1. 1
      libswscale/rgb2rgb.c
  2. 17
      libswscale/rgb2rgb_template.c

1
libswscale/rgb2rgb.c
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@ -99,6 +99,7 @@ void (*yuyvtoyuv422)(uint8_t *ydst, uint8_t *udst, uint8_t *vdst, const uint8_t
#if ARCH_X86
DECLARE_ASM_CONST(8, uint64_t, mmx_ff) = 0x00000000000000FFULL;
DECLARE_ASM_CONST(8, uint64_t, mmx_null) = 0x0000000000000000ULL;
DECLARE_ASM_CONST(8, uint64_t, mmx_one) = 0xFFFFFFFFFFFFFFFFULL;
DECLARE_ASM_CONST(8, uint64_t, mask32b) = 0x000000FF000000FFULL;

17
libswscale/rgb2rgb_template.c
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@ -1773,13 +1773,22 @@ static inline void RENAME(planar2x)(const uint8_t *src, uint8_t *dst, long srcWi
const x86_reg mmxSize= srcWidth&~15;
__asm__ volatile(
"mov %4, %%"REG_a" \n\t"
"movq "MANGLE(mmx_ff)", %%mm0 \n\t"
"movq (%0, %%"REG_a"), %%mm4 \n\t"
"movq %%mm4, %%mm2 \n\t"
"psllq $8, %%mm4 \n\t"
"pand %%mm0, %%mm2 \n\t"
"por %%mm2, %%mm4 \n\t"
"movq (%1, %%"REG_a"), %%mm5 \n\t"
"movq %%mm5, %%mm3 \n\t"
"psllq $8, %%mm5 \n\t"
"pand %%mm0, %%mm3 \n\t"
"por %%mm3, %%mm5 \n\t"
"1: \n\t"
"movq (%0, %%"REG_a"), %%mm0 \n\t"
"movq (%1, %%"REG_a"), %%mm1 \n\t"
"movq 1(%0, %%"REG_a"), %%mm2 \n\t"
"movq 1(%1, %%"REG_a"), %%mm3 \n\t"
"movq -1(%0, %%"REG_a"), %%mm4 \n\t"
"movq -1(%1, %%"REG_a"), %%mm5 \n\t"
PAVGB" %%mm0, %%mm5 \n\t"
PAVGB" %%mm0, %%mm3 \n\t"
PAVGB" %%mm0, %%mm5 \n\t"
@ -1806,6 +1815,8 @@ static inline void RENAME(planar2x)(const uint8_t *src, uint8_t *dst, long srcWi
"movq %%mm6, 8(%3, %%"REG_a", 2) \n\t"
#endif
"add $8, %%"REG_a" \n\t"
"movq -1(%0, %%"REG_a"), %%mm4 \n\t"
"movq -1(%1, %%"REG_a"), %%mm5 \n\t"
" js 1b \n\t"
:: "r" (src + mmxSize ), "r" (src + srcStride + mmxSize ),
"r" (dst + mmxSize*2), "r" (dst + dstStride + mmxSize*2),
@ -1815,9 +1826,9 @@ static inline void RENAME(planar2x)(const uint8_t *src, uint8_t *dst, long srcWi
);
#else
const x86_reg mmxSize=1;
#endif
dst[0 ]= (3*src[0] + src[srcStride])>>2;
dst[dstStride]= ( src[0] + 3*src[srcStride])>>2;
#endif
for (x=mmxSize-1; x<srcWidth-1; x++) {
dst[2*x +1]= (3*src[x+0] + src[x+srcStride+1])>>2;

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