private unsafe static void WriteChroma(
Span <byte> dst,
ReadOnlySpan <byte> srcU,
ReadOnlySpan <byte> srcV,
int srcStride,
int width,
int height)
{
OffsetCalculator calc = new OffsetCalculator(width, height, 0, false, 2, 2);
if (Sse2.IsSupported)
{
int strideTrunc64 = BitUtils.AlignDown(width * 2, 64);
int inStrideGap = srcStride - width;
fixed(byte *outputPtr = dst, srcUPtr = srcU, srcVPtr = srcV)
{
byte *inUPtr = srcUPtr;
byte *inVPtr = srcVPtr;
for (int y = 0; y < height; y++)
{
calc.SetY(y);
for (int x = 0; x < strideTrunc64; x += 64, inUPtr += 32, inVPtr += 32)
{
byte *offset = outputPtr + calc.GetOffsetWithLineOffset64(x);
byte *offset2 = offset + 0x20;
byte *offset3 = offset + 0x100;
byte *offset4 = offset + 0x120;
Vector128 <byte> value = *(Vector128 <byte> *)inUPtr;
Vector128 <byte> value2 = *(Vector128 <byte> *)inVPtr;
Vector128 <byte> value3 = *(Vector128 <byte> *)(inUPtr + 16);
Vector128 <byte> value4 = *(Vector128 <byte> *)(inVPtr + 16);
Vector128 <byte> uv0 = Sse2.UnpackLow(value, value2);
Vector128 <byte> uv1 = Sse2.UnpackHigh(value, value2);
Vector128 <byte> uv2 = Sse2.UnpackLow(value3, value4);
Vector128 <byte> uv3 = Sse2.UnpackHigh(value3, value4);
*(Vector128 <byte> *)offset = uv0;
*(Vector128 <byte> *)offset2 = uv1;
*(Vector128 <byte> *)offset3 = uv2;
*(Vector128 <byte> *)offset4 = uv3;
}
for (int x = strideTrunc64 / 2; x < width; x++, inUPtr++, inVPtr++)
{
byte *offset = outputPtr + calc.GetOffset(x);
*offset = *inUPtr;
*(offset + 1) = *inVPtr;
}
inUPtr += inStrideGap;
inVPtr += inStrideGap;
}
}
}
else
{
for (int y = 0; y < height; y++)
{
int srcBaseOffset = y * srcStride;
calc.SetY(y);
for (int x = 0; x < width; x++)
{
int dstOffset = calc.GetOffset(x);
dst[dstOffset + 0] = srcU[srcBaseOffset + x];
dst[dstOffset + 1] = srcV[srcBaseOffset + x];
}
}
}
}
private unsafe static void ReadChroma(
Span <byte> dstU,
Span <byte> dstV,
ReadOnlySpan <byte> src,
int dstStride,
int width,
int height)
{
OffsetCalculator calc = new OffsetCalculator(width, height, 0, false, 2, 2);
if (Sse2.IsSupported)
{
int strideTrunc64 = BitUtils.AlignDown(width * 2, 64);
int outStrideGap = dstStride - width;
fixed(byte *dstUPtr = dstU, dstVPtr = dstV, dataPtr = src)
{
byte *uPtr = dstUPtr;
byte *vPtr = dstVPtr;
for (int y = 0; y < height; y++)
{
calc.SetY(y);
for (int x = 0; x < strideTrunc64; x += 64, uPtr += 32, vPtr += 32)
{
byte *offset = dataPtr + calc.GetOffsetWithLineOffset64(x);
byte *offset2 = offset + 0x20;
byte *offset3 = offset + 0x100;
byte *offset4 = offset + 0x120;
Vector128 <byte> value = *(Vector128 <byte> *)offset;
Vector128 <byte> value2 = *(Vector128 <byte> *)offset2;
Vector128 <byte> value3 = *(Vector128 <byte> *)offset3;
Vector128 <byte> value4 = *(Vector128 <byte> *)offset4;
Vector128 <byte> u00 = Sse2.UnpackLow(value, value2);
Vector128 <byte> v00 = Sse2.UnpackHigh(value, value2);
Vector128 <byte> u01 = Sse2.UnpackLow(value3, value4);
Vector128 <byte> v01 = Sse2.UnpackHigh(value3, value4);
Vector128 <byte> u10 = Sse2.UnpackLow(u00, v00);
Vector128 <byte> v10 = Sse2.UnpackHigh(u00, v00);
Vector128 <byte> u11 = Sse2.UnpackLow(u01, v01);
Vector128 <byte> v11 = Sse2.UnpackHigh(u01, v01);
Vector128 <byte> u20 = Sse2.UnpackLow(u10, v10);
Vector128 <byte> v20 = Sse2.UnpackHigh(u10, v10);
Vector128 <byte> u21 = Sse2.UnpackLow(u11, v11);
Vector128 <byte> v21 = Sse2.UnpackHigh(u11, v11);
Vector128 <byte> u30 = Sse2.UnpackLow(u20, v20);
Vector128 <byte> v30 = Sse2.UnpackHigh(u20, v20);
Vector128 <byte> u31 = Sse2.UnpackLow(u21, v21);
Vector128 <byte> v31 = Sse2.UnpackHigh(u21, v21);
*(Vector128 <byte> *)uPtr = u30;
*(Vector128 <byte> *)(uPtr + 16) = u31;
*(Vector128 <byte> *)vPtr = v30;
*(Vector128 <byte> *)(vPtr + 16) = v31;
}
for (int x = strideTrunc64 / 2; x < width; x++, uPtr++, vPtr++)
{
byte *offset = dataPtr + calc.GetOffset(x);
*uPtr = *offset;
*vPtr = *(offset + 1);
}
uPtr += outStrideGap;
vPtr += outStrideGap;
}
}
}
else
{
for (int y = 0; y < height; y++)
{
int dstBaseOffset = y * dstStride;
calc.SetY(y);
for (int x = 0; x < width; x++)
{
int srcOffset = calc.GetOffset(x);
dstU[dstBaseOffset + x] = src[srcOffset];
dstV[dstBaseOffset + x] = src[srcOffset + 1];
}
}
}
}