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Avoid pinning

pull/1830/head
Brian Popow 5 years ago
parent
8e5645912c
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b15a021fac
1 changed files with 156 additions and 185 deletions
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  1. 341
      src/ImageSharp/Formats/Webp/Lossless/LosslessUtils.cs

341
src/ImageSharp/Formats/Webp/Lossless/LosslessUtils.cs
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@ -128,66 +128,57 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
if (Avx2.IsSupported) if (Avx2.IsSupported)
{ {
int numPixels = pixelData.Length; int numPixels = pixelData.Length;
fixed (uint* p = pixelData) int i;
for (i = 0; i + 8 <= numPixels; i += 8)
{ {
int i; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), i);
for (i = 0; i + 8 <= numPixels; i += 8) Vector256<byte> input = Unsafe.As<uint, Vector256<uint>>(ref pos).AsByte();
{ Vector256<byte> in0g0g = Avx2.Shuffle(input, AddGreenToBlueAndRedMaskAvx2);
uint* idx = p + i; Vector256<byte> output = Avx2.Add(input, in0g0g);
Vector256<byte> input = Avx.LoadVector256((ushort*)idx).AsByte(); Unsafe.As<uint, Vector256<uint>>(ref pos) = output.AsUInt32();
Vector256<byte> in0g0g = Avx2.Shuffle(input, AddGreenToBlueAndRedMaskAvx2); }
Vector256<byte> output = Avx2.Add(input, in0g0g);
Avx.Store((byte*)idx, output);
}
if (i != numPixels) if (i != numPixels)
{ {
AddGreenToBlueAndRedNoneVectorized(pixelData.Slice(i)); AddGreenToBlueAndRedNoneVectorized(pixelData.Slice(i));
}
} }
} }
else if (Ssse3.IsSupported) else if (Ssse3.IsSupported)
{ {
int numPixels = pixelData.Length; int numPixels = pixelData.Length;
fixed (uint* p = pixelData) int i;
for (i = 0; i + 4 <= numPixels; i += 4)
{ {
int i; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), i);
for (i = 0; i + 4 <= numPixels; i += 4) Vector128<byte> input = Unsafe.As<uint, Vector128<uint>>(ref pos).AsByte();
{ Vector128<byte> in0g0g = Ssse3.Shuffle(input, AddGreenToBlueAndRedMaskSsse3);
uint* idx = p + i; Vector128<byte> output = Sse2.Add(input, in0g0g);
Vector128<byte> input = Sse2.LoadVector128((ushort*)idx).AsByte(); Unsafe.As<uint, Vector128<uint>>(ref pos) = output.AsUInt32();
Vector128<byte> in0g0g = Ssse3.Shuffle(input, AddGreenToBlueAndRedMaskSsse3); }
Vector128<byte> output = Sse2.Add(input, in0g0g);
Sse2.Store((byte*)idx, output.AsByte());
}
if (i != numPixels) if (i != numPixels)
{ {
AddGreenToBlueAndRedNoneVectorized(pixelData.Slice(i)); AddGreenToBlueAndRedNoneVectorized(pixelData.Slice(i));
}
} }
} }
else if (Sse2.IsSupported) else if (Sse2.IsSupported)
{ {
int numPixels = pixelData.Length; int numPixels = pixelData.Length;
fixed (uint* p = pixelData) int i;
for (i = 0; i + 4 <= numPixels; i += 4)
{ {
int i; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), i);
for (i = 0; i + 4 <= numPixels; i += 4) Vector128<byte> input = Unsafe.As<uint, Vector128<uint>>(ref pos).AsByte();
{ Vector128<ushort> a = Sse2.ShiftRightLogical(input.AsUInt16(), 8); // 0 a 0 g
uint* idx = p + i; Vector128<ushort> b = Sse2.ShuffleLow(a, AddGreenToBlueAndRedShuffleMask);
Vector128<ushort> input = Sse2.LoadVector128((ushort*)idx); Vector128<ushort> c = Sse2.ShuffleHigh(b, AddGreenToBlueAndRedShuffleMask); // 0g0g
Vector128<ushort> a = Sse2.ShiftRightLogical(input.AsUInt16(), 8); // 0 a 0 g Vector128<byte> output = Sse2.Add(input.AsByte(), c.AsByte());
Vector128<ushort> b = Sse2.ShuffleLow(a, AddGreenToBlueAndRedShuffleMask); Unsafe.As<uint, Vector128<uint>>(ref pos) = output.AsUInt32();
Vector128<ushort> c = Sse2.ShuffleHigh(b, AddGreenToBlueAndRedShuffleMask); // 0g0g }
Vector128<byte> output = Sse2.Add(input.AsByte(), c.AsByte());
Sse2.Store((byte*)idx, output);
}
if (i != numPixels) if (i != numPixels)
{ {
AddGreenToBlueAndRedNoneVectorized(pixelData.Slice(i)); AddGreenToBlueAndRedNoneVectorized(pixelData.Slice(i));
}
} }
} }
else else
@ -217,66 +208,57 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
if (Avx2.IsSupported) if (Avx2.IsSupported)
{ {
int numPixels = pixelData.Length; int numPixels = pixelData.Length;
fixed (uint* p = pixelData) int i;
for (i = 0; i + 8 <= numPixels; i += 8)
{ {
int i; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), i);
for (i = 0; i + 8 <= numPixels; i += 8) Vector256<byte> input = Unsafe.As<uint, Vector256<uint>>(ref pos).AsByte();
{ Vector256<byte> in0g0g = Avx2.Shuffle(input, SubtractGreenFromBlueAndRedMaskAvx2);
uint* idx = p + i; Vector256<byte> output = Avx2.Subtract(input, in0g0g);
Vector256<byte> input = Avx.LoadVector256((ushort*)idx).AsByte(); Unsafe.As<uint, Vector256<uint>>(ref pos) = output.AsUInt32();
Vector256<byte> in0g0g = Avx2.Shuffle(input, SubtractGreenFromBlueAndRedMaskAvx2); }
Vector256<byte> output = Avx2.Subtract(input, in0g0g);
Avx.Store((byte*)idx, output);
}
if (i != numPixels) if (i != numPixels)
{ {
SubtractGreenFromBlueAndRedNoneVectorized(pixelData.Slice(i)); SubtractGreenFromBlueAndRedNoneVectorized(pixelData.Slice(i));
}
} }
} }
else if (Ssse3.IsSupported) else if (Ssse3.IsSupported)
{ {
int numPixels = pixelData.Length; int numPixels = pixelData.Length;
fixed (uint* p = pixelData) int i;
for (i = 0; i + 4 <= numPixels; i += 4)
{ {
int i; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), i);
for (i = 0; i + 4 <= numPixels; i += 4) Vector128<byte> input = Unsafe.As<uint, Vector128<uint>>(ref pos).AsByte();
{ Vector128<byte> in0g0g = Ssse3.Shuffle(input, SubtractGreenFromBlueAndRedMaskSsse3);
uint* idx = p + i; Vector128<byte> output = Sse2.Subtract(input, in0g0g);
Vector128<byte> input = Sse2.LoadVector128((ushort*)idx).AsByte(); Unsafe.As<uint, Vector128<uint>>(ref pos) = output.AsUInt32();
Vector128<byte> in0g0g = Ssse3.Shuffle(input, SubtractGreenFromBlueAndRedMaskSsse3); }
Vector128<byte> output = Sse2.Subtract(input, in0g0g);
Sse2.Store((byte*)idx, output.AsByte());
}
if (i != numPixels) if (i != numPixels)
{ {
SubtractGreenFromBlueAndRedNoneVectorized(pixelData.Slice(i)); SubtractGreenFromBlueAndRedNoneVectorized(pixelData.Slice(i));
}
} }
} }
else if (Sse2.IsSupported) else if (Sse2.IsSupported)
{ {
int numPixels = pixelData.Length; int numPixels = pixelData.Length;
fixed (uint* p = pixelData) int i;
for (i = 0; i + 4 <= numPixels; i += 4)
{ {
int i; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), i);
for (i = 0; i + 4 <= numPixels; i += 4) Vector128<byte> input = Unsafe.As<uint, Vector128<uint>>(ref pos).AsByte();
{ Vector128<ushort> a = Sse2.ShiftRightLogical(input.AsUInt16(), 8); // 0 a 0 g
uint* idx = p + i; Vector128<ushort> b = Sse2.ShuffleLow(a, SubtractGreenFromBlueAndRedShuffleMask);
Vector128<ushort> input = Sse2.LoadVector128((ushort*)idx); Vector128<ushort> c = Sse2.ShuffleHigh(b, SubtractGreenFromBlueAndRedShuffleMask); // 0g0g
Vector128<ushort> a = Sse2.ShiftRightLogical(input.AsUInt16(), 8); // 0 a 0 g Vector128<byte> output = Sse2.Subtract(input.AsByte(), c.AsByte());
Vector128<ushort> b = Sse2.ShuffleLow(a, SubtractGreenFromBlueAndRedShuffleMask); Unsafe.As<uint, Vector128<uint>>(ref pos) = output.AsUInt32();
Vector128<ushort> c = Sse2.ShuffleHigh(b, SubtractGreenFromBlueAndRedShuffleMask); // 0g0g }
Vector128<byte> output = Sse2.Subtract(input.AsByte(), c.AsByte());
Sse2.Store((byte*)idx, output);
}
if (i != numPixels) if (i != numPixels)
{ {
SubtractGreenFromBlueAndRedNoneVectorized(pixelData.Slice(i)); SubtractGreenFromBlueAndRedNoneVectorized(pixelData.Slice(i));
}
} }
} }
else else
@ -409,75 +391,70 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
/// Color transform keeps the green (G) value as it is, transforms red (R) based on green and transforms blue (B) based on green and then based on red. /// Color transform keeps the green (G) value as it is, transforms red (R) based on green and transforms blue (B) based on green and then based on red.
/// </summary> /// </summary>
/// <param name="m">The Vp8LMultipliers.</param> /// <param name="m">The Vp8LMultipliers.</param>
/// <param name="data">The pixel data to transform.</param> /// <param name="pixelData">The pixel data to transform.</param>
/// <param name="numPixels">The number of pixels to process.</param> /// <param name="numPixels">The number of pixels to process.</param>
public static void TransformColor(Vp8LMultipliers m, Span<uint> data, int numPixels) public static void TransformColor(Vp8LMultipliers m, Span<uint> pixelData, int numPixels)
{ {
#if SUPPORTS_RUNTIME_INTRINSICS #if SUPPORTS_RUNTIME_INTRINSICS
if (Avx2.IsSupported && numPixels >= 8) if (Avx2.IsSupported && numPixels >= 8)
{ {
Vector256<int> multsrb = MkCst32(Cst5b(m.GreenToRed), Cst5b(m.GreenToBlue)); Vector256<int> multsrb = MkCst32(Cst5b(m.GreenToRed), Cst5b(m.GreenToBlue));
Vector256<int> multsb2 = MkCst32(Cst5b(m.RedToBlue), 0); Vector256<int> multsb2 = MkCst32(Cst5b(m.RedToBlue), 0);
fixed (uint* src = data)
int idx;
for (idx = 0; idx + 8 <= numPixels; idx += 8)
{ {
int idx; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), idx);
for (idx = 0; idx + 8 <= numPixels; idx += 8) Vector256<uint> input = Unsafe.As<uint, Vector256<uint>>(ref pos);
{ Vector256<byte> a = Avx2.And(input.AsByte(), TransformColorAlphaGreenMask256);
uint* pos = src + idx; Vector256<short> b = Avx2.ShuffleLow(a.AsInt16(), TransformColorShuffleMask);
Vector256<uint> input = Avx.LoadVector256(pos); Vector256<short> c = Avx2.ShuffleHigh(b.AsInt16(), TransformColorShuffleMask);
Vector256<byte> a = Avx2.And(input.AsByte(), TransformColorAlphaGreenMask256); Vector256<short> d = Avx2.MultiplyHigh(c.AsInt16(), multsrb.AsInt16());
Vector256<short> b = Avx2.ShuffleLow(a.AsInt16(), TransformColorShuffleMask); Vector256<short> e = Avx2.ShiftLeftLogical(input.AsInt16(), 8);
Vector256<short> c = Avx2.ShuffleHigh(b.AsInt16(), TransformColorShuffleMask); Vector256<short> f = Avx2.MultiplyHigh(e.AsInt16(), multsb2.AsInt16());
Vector256<short> d = Avx2.MultiplyHigh(c.AsInt16(), multsrb.AsInt16()); Vector256<int> g = Avx2.ShiftRightLogical(f.AsInt32(), 16);
Vector256<short> e = Avx2.ShiftLeftLogical(input.AsInt16(), 8); Vector256<byte> h = Avx2.Add(g.AsByte(), d.AsByte());
Vector256<short> f = Avx2.MultiplyHigh(e.AsInt16(), multsb2.AsInt16()); Vector256<byte> i = Avx2.And(h, TransformColorRedBlueMask256);
Vector256<int> g = Avx2.ShiftRightLogical(f.AsInt32(), 16); Vector256<byte> output = Avx2.Subtract(input.AsByte(), i);
Vector256<byte> h = Avx2.Add(g.AsByte(), d.AsByte()); Unsafe.As<uint, Vector256<uint>>(ref pos) = output.AsUInt32();
Vector256<byte> i = Avx2.And(h, TransformColorRedBlueMask256); }
Vector256<byte> output = Avx2.Subtract(input.AsByte(), i);
Avx.Store((byte*)pos, output);
}
if (idx != numPixels) if (idx != numPixels)
{ {
TransformColorNoneVectorized(m, data.Slice(idx), numPixels - idx); TransformColorNoneVectorized(m, pixelData.Slice(idx), numPixels - idx);
}
} }
} }
else if (Sse2.IsSupported) else if (Sse2.IsSupported)
{ {
Vector128<int> multsrb = MkCst16(Cst5b(m.GreenToRed), Cst5b(m.GreenToBlue)); Vector128<int> multsrb = MkCst16(Cst5b(m.GreenToRed), Cst5b(m.GreenToBlue));
Vector128<int> multsb2 = MkCst16(Cst5b(m.RedToBlue), 0); Vector128<int> multsb2 = MkCst16(Cst5b(m.RedToBlue), 0);
fixed (uint* src = data) int idx;
for (idx = 0; idx + 4 <= numPixels; idx += 4)
{ {
int idx; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), idx);
for (idx = 0; idx + 4 <= numPixels; idx += 4) Vector128<uint> input = Unsafe.As<uint, Vector128<uint>>(ref pos);
{ Vector128<byte> a = Sse2.And(input.AsByte(), TransformColorAlphaGreenMask);
uint* pos = src + idx; Vector128<short> b = Sse2.ShuffleLow(a.AsInt16(), TransformColorShuffleMask);
Vector128<uint> input = Sse2.LoadVector128(pos); Vector128<short> c = Sse2.ShuffleHigh(b.AsInt16(), TransformColorShuffleMask);
Vector128<byte> a = Sse2.And(input.AsByte(), TransformColorAlphaGreenMask); Vector128<short> d = Sse2.MultiplyHigh(c.AsInt16(), multsrb.AsInt16());
Vector128<short> b = Sse2.ShuffleLow(a.AsInt16(), TransformColorShuffleMask); Vector128<short> e = Sse2.ShiftLeftLogical(input.AsInt16(), 8);
Vector128<short> c = Sse2.ShuffleHigh(b.AsInt16(), TransformColorShuffleMask); Vector128<short> f = Sse2.MultiplyHigh(e.AsInt16(), multsb2.AsInt16());
Vector128<short> d = Sse2.MultiplyHigh(c.AsInt16(), multsrb.AsInt16()); Vector128<int> g = Sse2.ShiftRightLogical(f.AsInt32(), 16);
Vector128<short> e = Sse2.ShiftLeftLogical(input.AsInt16(), 8); Vector128<byte> h = Sse2.Add(g.AsByte(), d.AsByte());
Vector128<short> f = Sse2.MultiplyHigh(e.AsInt16(), multsb2.AsInt16()); Vector128<byte> i = Sse2.And(h, TransformColorRedBlueMask);
Vector128<int> g = Sse2.ShiftRightLogical(f.AsInt32(), 16); Vector128<byte> output = Sse2.Subtract(input.AsByte(), i);
Vector128<byte> h = Sse2.Add(g.AsByte(), d.AsByte()); Unsafe.As<uint, Vector128<uint>>(ref pos) = output.AsUInt32();
Vector128<byte> i = Sse2.And(h, TransformColorRedBlueMask); }
Vector128<byte> output = Sse2.Subtract(input.AsByte(), i);
Sse2.Store((byte*)pos, output);
}
if (idx != numPixels) if (idx != numPixels)
{ {
TransformColorNoneVectorized(m, data.Slice(idx), numPixels - idx); TransformColorNoneVectorized(m, pixelData.Slice(idx), numPixels - idx);
}
} }
} }
else else
#endif #endif
{ {
TransformColorNoneVectorized(m, data, numPixels); TransformColorNoneVectorized(m, pixelData, numPixels);
} }
} }
@ -511,62 +488,57 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
{ {
Vector256<int> multsrb = MkCst32(Cst5b(m.GreenToRed), Cst5b(m.GreenToBlue)); Vector256<int> multsrb = MkCst32(Cst5b(m.GreenToRed), Cst5b(m.GreenToBlue));
Vector256<int> multsb2 = MkCst32(Cst5b(m.RedToBlue), 0); Vector256<int> multsb2 = MkCst32(Cst5b(m.RedToBlue), 0);
fixed (uint* src = pixelData) int idx;
for (idx = 0; idx + 8 <= pixelData.Length; idx += 8)
{ {
int idx; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), idx);
for (idx = 0; idx + 8 <= pixelData.Length; idx += 8) Vector256<uint> input = Unsafe.As<uint, Vector256<uint>>(ref pos);
{ Vector256<byte> a = Avx2.And(input.AsByte(), TransformColorInverseAlphaGreenMask256);
uint* pos = src + idx; Vector256<short> b = Avx2.ShuffleLow(a.AsInt16(), TransformColorInverseShuffleMask);
Vector256<uint> input = Avx.LoadVector256(pos); Vector256<short> c = Avx2.ShuffleHigh(b.AsInt16(), TransformColorInverseShuffleMask);
Vector256<byte> a = Avx2.And(input.AsByte(), TransformColorInverseAlphaGreenMask256); Vector256<short> d = Avx2.MultiplyHigh(c.AsInt16(), multsrb.AsInt16());
Vector256<short> b = Avx2.ShuffleLow(a.AsInt16(), TransformColorInverseShuffleMask); Vector256<byte> e = Avx2.Add(input.AsByte(), d.AsByte());
Vector256<short> c = Avx2.ShuffleHigh(b.AsInt16(), TransformColorInverseShuffleMask); Vector256<short> f = Avx2.ShiftLeftLogical(e.AsInt16(), 8);
Vector256<short> d = Avx2.MultiplyHigh(c.AsInt16(), multsrb.AsInt16()); Vector256<short> g = Avx2.MultiplyHigh(f, multsb2.AsInt16());
Vector256<byte> e = Avx2.Add(input.AsByte(), d.AsByte()); Vector256<int> h = Avx2.ShiftRightLogical(g.AsInt32(), 8);
Vector256<short> f = Avx2.ShiftLeftLogical(e.AsInt16(), 8); Vector256<byte> i = Avx2.Add(h.AsByte(), f.AsByte());
Vector256<short> g = Avx2.MultiplyHigh(f, multsb2.AsInt16()); Vector256<short> j = Avx2.ShiftRightLogical(i.AsInt16(), 8);
Vector256<int> h = Avx2.ShiftRightLogical(g.AsInt32(), 8); Vector256<byte> output = Avx2.Or(j.AsByte(), a);
Vector256<byte> i = Avx2.Add(h.AsByte(), f.AsByte()); Unsafe.As<uint, Vector256<uint>>(ref pos) = output.AsUInt32();
Vector256<short> j = Avx2.ShiftRightLogical(i.AsInt16(), 8); }
Vector256<byte> output = Avx2.Or(j.AsByte(), a);
Avx.Store((byte*)pos, output);
}
if (idx != pixelData.Length) if (idx != pixelData.Length)
{ {
TransformColorInverseNoneVectorized(m, pixelData.Slice(idx)); TransformColorInverseNoneVectorized(m, pixelData.Slice(idx));
}
} }
} }
else if (Sse2.IsSupported) else if (Sse2.IsSupported)
{ {
Vector128<int> multsrb = MkCst16(Cst5b(m.GreenToRed), Cst5b(m.GreenToBlue)); Vector128<int> multsrb = MkCst16(Cst5b(m.GreenToRed), Cst5b(m.GreenToBlue));
Vector128<int> multsb2 = MkCst16(Cst5b(m.RedToBlue), 0); Vector128<int> multsb2 = MkCst16(Cst5b(m.RedToBlue), 0);
fixed (uint* src = pixelData)
int idx;
for (idx = 0; idx + 4 <= pixelData.Length; idx += 4)
{ {
int idx; ref uint pos = ref Unsafe.Add(ref MemoryMarshal.GetReference(pixelData), idx);
for (idx = 0; idx + 4 <= pixelData.Length; idx += 4) Vector128<uint> input = Unsafe.As<uint, Vector128<uint>>(ref pos);
{ Vector128<byte> a = Sse2.And(input.AsByte(), TransformColorInverseAlphaGreenMask);
uint* pos = src + idx; Vector128<short> b = Sse2.ShuffleLow(a.AsInt16(), TransformColorInverseShuffleMask);
Vector128<uint> input = Sse2.LoadVector128(pos); Vector128<short> c = Sse2.ShuffleHigh(b.AsInt16(), TransformColorInverseShuffleMask);
Vector128<byte> a = Sse2.And(input.AsByte(), TransformColorInverseAlphaGreenMask); Vector128<short> d = Sse2.MultiplyHigh(c.AsInt16(), multsrb.AsInt16());
Vector128<short> b = Sse2.ShuffleLow(a.AsInt16(), TransformColorInverseShuffleMask); Vector128<byte> e = Sse2.Add(input.AsByte(), d.AsByte());
Vector128<short> c = Sse2.ShuffleHigh(b.AsInt16(), TransformColorInverseShuffleMask); Vector128<short> f = Sse2.ShiftLeftLogical(e.AsInt16(), 8);
Vector128<short> d = Sse2.MultiplyHigh(c.AsInt16(), multsrb.AsInt16()); Vector128<short> g = Sse2.MultiplyHigh(f, multsb2.AsInt16());
Vector128<byte> e = Sse2.Add(input.AsByte(), d.AsByte()); Vector128<int> h = Sse2.ShiftRightLogical(g.AsInt32(), 8);
Vector128<short> f = Sse2.ShiftLeftLogical(e.AsInt16(), 8); Vector128<byte> i = Sse2.Add(h.AsByte(), f.AsByte());
Vector128<short> g = Sse2.MultiplyHigh(f, multsb2.AsInt16()); Vector128<short> j = Sse2.ShiftRightLogical(i.AsInt16(), 8);
Vector128<int> h = Sse2.ShiftRightLogical(g.AsInt32(), 8); Vector128<byte> output = Sse2.Or(j.AsByte(), a);
Vector128<byte> i = Sse2.Add(h.AsByte(), f.AsByte()); Unsafe.As<uint, Vector128<uint>>(ref pos) = output.AsUInt32();
Vector128<short> j = Sse2.ShiftRightLogical(i.AsInt16(), 8); }
Vector128<byte> output = Sse2.Or(j.AsByte(), a);
Sse2.Store((byte*)pos, output);
}
if (idx != pixelData.Length) if (idx != pixelData.Length)
{ {
TransformColorInverseNoneVectorized(m, pixelData.Slice(idx)); TransformColorInverseNoneVectorized(m, pixelData.Slice(idx));
}
} }
} }
else else
@ -885,15 +857,14 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
int correction = (int)((23 * (origV & (y - 1))) >> 4); int correction = (int)((23 * (origV & (y - 1))) >> 4);
return (vF * (WebpLookupTables.Log2Table[v] + logCnt)) + correction; return (vF * (WebpLookupTables.Log2Table[v] + logCnt)) + correction;
} }
else
{ return (float)(Log2Reciprocal * v * Math.Log(v));
return (float)(Log2Reciprocal * v * Math.Log(v));
}
} }
private static float FastLog2Slow(uint v) private static float FastLog2Slow(uint v)
{ {
Guard.MustBeGreaterThanOrEqualTo(v, LogLookupIdxMax, nameof(v)); Guard.MustBeGreaterThanOrEqualTo(v, LogLookupIdxMax, nameof(v));
if (v < ApproxLogWithCorrectionMax) if (v < ApproxLogWithCorrectionMax)
{ {
int logCnt = 0; int logCnt = 0;

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