dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2024-11-20 04:18:26 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

40% faster ApplyAlphaMultiply_SSE2

Browse Source 
process four pixels at a time

Change-Id: I1dee7f70772be4915654fc6638ef4729a1a239d4
This commit is contained in:
Pascal Massimino 2017-01-12 02:22:16 -08:00
parent 49d0280df1
commit 0d55f60c91
1 changed files with 20 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/dsp/alpha_processing_sse2.c
View File

@ -154,17 +154,24 @@ static int ExtractAlpha(const uint8_t* argb, int argb_stride,
// We use: v / 255 = (v * 0x8081) >> 23, where v = alpha * {r,g,b} is a 16bit
// value.
#define APPLY_ALPHA(RGBX, SHUFFLE) do { \
const __m128i argb0 = _mm_loadl_epi64((const __m128i*)&(RGBX)); \
const __m128i argb1 = _mm_unpacklo_epi8(argb0, zero); \
const __m128i alpha0 = _mm_or_si128(argb1, kMask); \
const __m128i alpha1 = _mm_shufflelo_epi16(alpha0, SHUFFLE); \
const __m128i alpha2 = _mm_shufflehi_epi16(alpha1, SHUFFLE); \
const __m128i argb0 = _mm_loadu_si128((const __m128i*)&(RGBX)); \
const __m128i argb1_lo = _mm_unpacklo_epi8(argb0, zero); \
const __m128i argb1_hi = _mm_unpackhi_epi8(argb0, zero); \
const __m128i alpha0_lo = _mm_or_si128(argb1_lo, kMask); \
const __m128i alpha0_hi = _mm_or_si128(argb1_hi, kMask); \
const __m128i alpha1_lo = _mm_shufflelo_epi16(alpha0_lo, SHUFFLE); \
const __m128i alpha1_hi = _mm_shufflelo_epi16(alpha0_hi, SHUFFLE); \
const __m128i alpha2_lo = _mm_shufflehi_epi16(alpha1_lo, SHUFFLE); \
const __m128i alpha2_hi = _mm_shufflehi_epi16(alpha1_hi, SHUFFLE); \
/* alpha2 = [ff a0 a0 a0][ff a1 a1 a1] */ \
const __m128i A0 = _mm_mullo_epi16(alpha2, argb1); \
const __m128i A1 = _mm_mulhi_epu16(A0, kMult); \
const __m128i A2 = _mm_srli_epi16(A1, 7); \
const __m128i A3 = _mm_packus_epi16(A2, zero); \
_mm_storel_epi64((__m128i*)&(RGBX), A3); \
const __m128i A0_lo = _mm_mullo_epi16(alpha2_lo, argb1_lo); \
const __m128i A0_hi = _mm_mullo_epi16(alpha2_hi, argb1_hi); \
const __m128i A1_lo = _mm_mulhi_epu16(A0_lo, kMult); \
const __m128i A1_hi = _mm_mulhi_epu16(A0_hi, kMult); \
const __m128i A2_lo = _mm_srli_epi16(A1_lo, 7); \
const __m128i A2_hi = _mm_srli_epi16(A1_hi, 7); \
const __m128i A3 = _mm_packus_epi16(A2_lo, A2_hi); \
_mm_storeu_si128((__m128i*)&(RGBX), A3); \
} while (0)
static void ApplyAlphaMultiply_SSE2(uint8_t* rgba, int alpha_first,
@ -172,7 +179,7 @@ static void ApplyAlphaMultiply_SSE2(uint8_t* rgba, int alpha_first,
const __m128i zero = _mm_setzero_si128();
const __m128i kMult = _mm_set1_epi16(0x8081u);
const __m128i kMask = _mm_set_epi16(0, 0xff, 0xff, 0, 0, 0xff, 0xff, 0);
const int kSpan = 2;
const int kSpan = 4;
while (h-- > 0) {
uint32_t* const rgbx = (uint32_t*)rgba;
int i;