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ImageSharp
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js/color-alpha-handling
James Jackson-South 6 years ago
parent
aecf80388c
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1067acbe4c
1 changed files with 16 additions and 10 deletions
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  1. 26
      src/ImageSharp/Common/Helpers/Vector4Utilities.cs

26
src/ImageSharp/Common/Helpers/Vector4Utilities.cs
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@ -61,7 +61,7 @@ namespace SixLabors.ImageSharp
/// Bulk variant of <see cref="Premultiply(ref Vector4)"/>
/// </summary>
/// <param name="vectors">The span of vectors</param>
[MethodImpl(InliningOptions.ShortMethod)]
[MethodImpl(InliningOptions.HotPath | InliningOptions.ShortMethod)]
public static void Premultiply(Span<Vector4> vectors)
{
#if SUPPORTS_RUNTIME_INTRINSICS
@ -73,12 +73,15 @@ namespace SixLabors.ImageSharp
Vector256<int> mask =
Unsafe.As<byte, Vector256<int>>(ref MemoryMarshal.GetReference(PermuteAlphaMask8x32));
int n = (vectors.Length * 4) / Vector256<float>.Count;
for (int i = 0; i < n; i++)
// Divide by 2 as 4 elements per Vector4 and 8 per Vector256<float>
ref Vector256<float> vectorsLast = ref Unsafe.Add(ref vectorsBase, (IntPtr)((uint)vectors.Length / 2u));
while (Unsafe.IsAddressLessThan(ref vectorsBase, ref vectorsLast))
{
ref Vector256<float> source = ref Unsafe.Add(ref vectorsBase, i);
Vector256<float> source = vectorsBase;
Vector256<float> multiply = Avx2.PermuteVar8x32(source, mask);
source = Avx.Blend(Avx.Multiply(source, multiply), source, BlendAlphaControl);
vectorsBase = Avx.Blend(Avx.Multiply(source, multiply), source, BlendAlphaControl);
vectorsBase = ref Unsafe.Add(ref vectorsBase, 1);
}
if (ImageMaths.Modulo2(vectors.Length) != 0)
@ -104,7 +107,7 @@ namespace SixLabors.ImageSharp
/// Bulk variant of <see cref="UnPremultiply(ref Vector4)"/>
/// </summary>
/// <param name="vectors">The span of vectors</param>
[MethodImpl(InliningOptions.ShortMethod)]
[MethodImpl(InliningOptions.HotPath | InliningOptions.ShortMethod)]
public static void UnPremultiply(Span<Vector4> vectors)
{
#if SUPPORTS_RUNTIME_INTRINSICS
@ -116,12 +119,15 @@ namespace SixLabors.ImageSharp
Vector256<int> mask =
Unsafe.As<byte, Vector256<int>>(ref MemoryMarshal.GetReference(PermuteAlphaMask8x32));
int n = (vectors.Length * 4) / Vector256<float>.Count;
for (int i = 0; i < n; i++)
// Divide by 2 as 4 elements per Vector4 and 8 per Vector256<float>
ref Vector256<float> vectorsLast = ref Unsafe.Add(ref vectorsBase, (IntPtr)((uint)vectors.Length / 2u));
while (Unsafe.IsAddressLessThan(ref vectorsBase, ref vectorsLast))
{
ref Vector256<float> source = ref Unsafe.Add(ref vectorsBase, i);
Vector256<float> source = vectorsBase;
Vector256<float> multiply = Avx2.PermuteVar8x32(source, mask);
source = Avx.Blend(Avx.Divide(source, multiply), source, BlendAlphaControl);
vectorsBase = Avx.Blend(Avx.Divide(source, multiply), source, BlendAlphaControl);
vectorsBase = ref Unsafe.Add(ref vectorsBase, 1);
}
if (ImageMaths.Modulo2(vectors.Length) != 0)

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