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libfreerdp-primitives: fix YUV420 color conversion matrix

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This commit is contained in:
Marc-André Moreau 2014-09-09 19:18:07 -04:00
parent bcf1266f51
commit 3d4fea7d8e
1 changed files with 3 additions and 17 deletions
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20
libfreerdp/primitives/prim_YUV_opt.c
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@ -117,15 +117,7 @@ pstatus_t ssse3_YUV420ToRGB_8u_P3AC4R(const BYTE **pSrc, int *srcStep,
r0 = _mm_unpacklo_epi16(r0,r4);
r4 = _mm_unpackhi_epi16(r7,r4);
/* to complete this step, add (?) 128 to each value (rounding ?!)
* yeah, add. in the end this will be subtracted from something,
* because it's part of G: 256*C - (48*D + 120*E - 128), 48*D-128 !
* by the way, our values have become signed dwords during multiplication! */
r6 = _mm_set_epi32(128,128,128,128);
r0 = _mm_sub_epi32(r0,r6);
r4 = _mm_sub_epi32(r4,r6);
/* to get B data, we need to prepare a secound value, D*475+128 */
/* to get B data, we need to prepare a second value, D*475 */
r1 = r2;
r7 = _mm_set_epi16(475,475,475,475,475,475,475,475);
r1 = _mm_mullo_epi16(r1,r7);
@ -134,9 +126,6 @@ pstatus_t ssse3_YUV420ToRGB_8u_P3AC4R(const BYTE **pSrc, int *srcStep,
r1 = _mm_unpacklo_epi16(r1,r2);
r7 = _mm_unpackhi_epi16(r7,r2);
r1 = _mm_add_epi32(r1,r6);
r7 = _mm_add_epi32(r7,r6);
/* so we got something like this: xmm7:xmm1
* this pair contains values for 16 pixel:
* aabbccdd
@ -153,7 +142,7 @@ pstatus_t ssse3_YUV420ToRGB_8u_P3AC4R(const BYTE **pSrc, int *srcStep,
r5 = r2;
/* this is also known as E*403+128, we need it to convert R data */
/* this is also known as E*403, we need it to convert R data */
r3 = r2;
r7 = _mm_set_epi16(403,403,403,403,403,403,403,403);
r2 = _mm_mullo_epi16(r2,r7);
@ -162,9 +151,6 @@ pstatus_t ssse3_YUV420ToRGB_8u_P3AC4R(const BYTE **pSrc, int *srcStep,
r2 = _mm_unpacklo_epi16(r2,r3);
r7 = _mm_unpackhi_epi16(r7,r3);
r2 = _mm_add_epi32(r2,r6);
r7 = _mm_add_epi32(r7,r6);
/* and preserve upper four values for future ... */
_mm_store_si128(buffer+2,r7);
@ -178,7 +164,7 @@ pstatus_t ssse3_YUV420ToRGB_8u_P3AC4R(const BYTE **pSrc, int *srcStep,
r7 = _mm_unpackhi_epi16(r7,r5);
/* now we complete what we've begun above:
* (48*D-128) + (120*E) = (48*D +120*E -128) */
* (48*D) + (120*E) = (48*D +120*E) */
r0 = _mm_add_epi32(r0,r3);
r4 = _mm_add_epi32(r4,r7);