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@ -2,6 +2,7 @@ |
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// Licensed under the Apache License, Version 2.0.
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using System; |
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using System.Numerics; |
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namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters |
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{ |
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@ -9,7 +10,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters |
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{ |
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/// <summary>
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/// <see cref="JpegColorConverterBase"/> abstract base for implementations
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/// based on <see cref="System.Numerics.Vector"/> API.
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/// based on <see cref="Vector"/> API.
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/// </summary>
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/// <remarks>
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/// Converters of this family can work with data of any size.
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@ -25,27 +26,26 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters |
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{ |
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} |
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public sealed override bool IsAvailable => SimdUtils.HasVector8; |
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public sealed override bool IsAvailable => Vector<float>.Count % 4 == 0; |
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public override void ConvertToRgbInplace(in ComponentValues values) |
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{ |
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DebugGuard.IsTrue(this.IsAvailable, $"{this.GetType().Name} converter is not supported on current hardware"); |
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int length = values.Component0.Length; |
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int remainder = values.Component0.Length % 8; |
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int remainder = values.Component0.Length % Vector<float>.Count; |
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// Jpeg images are guaranteed to have pixel strides at least 8 pixels wide
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// Thus there's no need to check whether simdCount is greater than zero
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int simdCount = length - remainder; |
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if (simdCount > 0) |
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this.ConvertCoreVectorizedInplace(values.Slice(0, simdCount)); |
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// There's actually a lot of image/photo resolutions which won't have
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// a remainder so it's better to check here than spend useless virtual call
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if (remainder > 0) |
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{ |
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// This implementation is actually AVX specific.
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// An AVX register is capable of storing 8 float-s.
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if (!this.IsAvailable) |
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{ |
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throw new InvalidOperationException( |
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"This converter can be used only on architecture having 256 byte floating point SIMD registers!"); |
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} |
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this.ConvertCoreVectorizedInplace(values.Slice(0, simdCount)); |
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this.ConvertCoreInplace(values.Slice(simdCount, remainder)); |
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} |
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this.ConvertCoreInplace(values.Slice(simdCount, remainder)); |
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} |
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protected virtual void ConvertCoreVectorizedInplace(in ComponentValues values) => throw new NotImplementedException(); |
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Dmitry Pentin
5 years ago