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Unroll C version of YUV blender for improved performance.

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R=dhrosa@google.com, harryjin@google.com
BUG=libyuv:527

Review URL: https://codereview.chromium.org/1502343003 .
This commit is contained in:
Frank Barchard 2015-12-07 12:02:45 -08:00
parent 48a919d86e
commit b0b22f88b9
1 changed files with 12 additions and 5 deletions
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17
source/row_common.cc
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@ -2017,16 +2017,23 @@ void ARGBBlendRow_C(const uint8* src_argb0, const uint8* src_argb1,
}
#undef BLEND
#define UBLEND(f, b, a) (((a) * f) + ((255 - a) * b) + 255) >> 8
void BlendPlaneRow_C(const uint8* src0, const uint8* src1,
const uint8* alpha, uint8* dst, int width) {
int x;
for (x = 0; x < width; ++x) {
uint32 f = *src0++;
uint32 b = *src1++;
uint32 a = *alpha++;
*dst++ = (((a) * f) + ((255 - a) * b) + 255) >> 8;
for (x = 0; x < width - 1; x += 2) {
dst[0] = UBLEND(src0[0], src1[0], alpha[0]);
dst[1] = UBLEND(src0[1], src1[1], alpha[1]);
src0 += 2;
src1 += 2;
alpha += 2;
dst += 2;
}
if (width & 1) {
dst[0] = UBLEND(src0[0], src1[0], alpha[0]);
}
}
#undef UBLEND
#define ATTENUATE(f, a) (a | (a << 8)) * (f | (f << 8)) >> 24