From 50bcbdc515976b05e66252cf17af743faecaf9ef Mon Sep 17 00:00:00 2001 From: James Jackson-South Date: Wed, 11 Dec 2019 11:00:50 +1100 Subject: [PATCH] Basic La16 implementation --- .../PixelFormats/PixelImplementations/L16.cs | 2 +- .../PixelFormats/PixelImplementations/L8.cs | 2 +- .../PixelFormats/PixelImplementations/La16.cs | 216 ++++++++++++++++++ 3 files changed, 218 insertions(+), 2 deletions(-) create mode 100644 src/ImageSharp/PixelFormats/PixelImplementations/La16.cs diff --git a/src/ImageSharp/PixelFormats/PixelImplementations/L16.cs b/src/ImageSharp/PixelFormats/PixelImplementations/L16.cs index cda79ab397..ad459abe59 100644 --- a/src/ImageSharp/PixelFormats/PixelImplementations/L16.cs +++ b/src/ImageSharp/PixelFormats/PixelImplementations/L16.cs @@ -7,7 +7,7 @@ using System.Runtime.CompilerServices; namespace SixLabors.ImageSharp.PixelFormats { /// - /// Packed pixel type containing a single 16 bit normalized luminance value. + /// Packed pixel type containing a single 16-bit normalized luminance value. /// /// Ranges from [0, 0, 0, 1] to [1, 1, 1, 1] in vector form. /// diff --git a/src/ImageSharp/PixelFormats/PixelImplementations/L8.cs b/src/ImageSharp/PixelFormats/PixelImplementations/L8.cs index 0ab26d603c..4b0a6b28eb 100644 --- a/src/ImageSharp/PixelFormats/PixelImplementations/L8.cs +++ b/src/ImageSharp/PixelFormats/PixelImplementations/L8.cs @@ -7,7 +7,7 @@ using System.Runtime.CompilerServices; namespace SixLabors.ImageSharp.PixelFormats { /// - /// Packed pixel type containing a single 8 bit normalized luminance value. + /// Packed pixel type containing a single 8-bit normalized luminance value. /// /// Ranges from [0, 0, 0, 1] to [1, 1, 1, 1] in vector form. /// diff --git a/src/ImageSharp/PixelFormats/PixelImplementations/La16.cs b/src/ImageSharp/PixelFormats/PixelImplementations/La16.cs new file mode 100644 index 0000000000..5a4e1dbcb8 --- /dev/null +++ b/src/ImageSharp/PixelFormats/PixelImplementations/La16.cs @@ -0,0 +1,216 @@ +// Copyright (c) Six Labors and contributors. +// Licensed under the Apache License, Version 2.0. + +using System.Numerics; +using System.Runtime.CompilerServices; +using System.Runtime.InteropServices; + +namespace SixLabors.ImageSharp.PixelFormats +{ + /// + /// Packed pixel type containing two 8-bit normalized values representing luminance and alpha. + /// + /// Ranges from [0, 0, 0, 0] to [1, 1, 1, 1] in vector form. + /// + /// + [StructLayout(LayoutKind.Explicit)] + public struct La16 : IPixel, IPackedVector + { + private static readonly Vector4 MaxBytes = new Vector4(255F); + private static readonly Vector4 Half = new Vector4(0.5F); + + /// + /// Gets or sets the luminance component. + /// + [FieldOffset(0)] + public byte L; + + /// + /// Gets or sets the alpha component. + /// + [FieldOffset(1)] + public byte A; + + /// + /// Initializes a new instance of the struct. + /// + /// The luminance component. + /// The alpha componant. + public La16(byte l, byte a) + { + this.L = l; + this.A = a; + } + + /// + public ushort PackedValue + { + get => Unsafe.As(ref this); + + set => Unsafe.As(ref this) = value; + } + + /// + /// Compares two objects for equality. + /// + /// The on the left side of the operand. + /// The on the right side of the operand. + /// + /// True if the parameter is equal to the parameter; otherwise, false. + /// + [MethodImpl(InliningOptions.ShortMethod)] + public static bool operator ==(La16 left, La16 right) => left.Equals(right); + + /// + /// Compares two objects for equality. + /// + /// The on the left side of the operand. + /// The on the right side of the operand. + /// + /// True if the parameter is not equal to the parameter; otherwise, false. + /// + [MethodImpl(InliningOptions.ShortMethod)] + public static bool operator !=(La16 left, La16 right) => !left.Equals(right); + + /// + public PixelOperations CreatePixelOperations() => new PixelOperations(); + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public bool Equals(La16 other) => this.PackedValue.Equals(other.PackedValue); + + /// + public override bool Equals(object obj) => obj is La16 other && this.Equals(other); + + /// + public override string ToString() => $"La16({this.L}, {this.A})"; + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public override int GetHashCode() => this.PackedValue.GetHashCode(); + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromArgb32(Argb32 source) + { + this.L = ImageMaths.Get8BitBT709Luminance(source.R, source.G, source.B); + this.A = source.A; + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromBgr24(Bgr24 source) + { + this.L = ImageMaths.Get8BitBT709Luminance(source.R, source.G, source.B); + this.A = byte.MaxValue; + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromBgra32(Bgra32 source) + { + this.L = ImageMaths.Get8BitBT709Luminance(source.R, source.G, source.B); + this.A = source.A; + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromBgra5551(Bgra5551 source) => this.FromScaledVector4(source.ToScaledVector4()); + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromL16(L16 source) + { + this.L = ImageMaths.DownScaleFrom16BitTo8Bit(source.PackedValue); + this.A = byte.MaxValue; + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromL8(L8 source) + { + this.L = source.PackedValue; + this.A = byte.MaxValue; + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromRgb24(Rgb24 source) + { + this.L = ImageMaths.Get8BitBT709Luminance(source.R, source.G, source.B); + this.A = byte.MaxValue; + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromRgb48(Rgb48 source) + { + this.L = ImageMaths.Get8BitBT709Luminance( + ImageMaths.DownScaleFrom16BitTo8Bit(source.R), + ImageMaths.DownScaleFrom16BitTo8Bit(source.G), + ImageMaths.DownScaleFrom16BitTo8Bit(source.B)); + + this.A = byte.MaxValue; + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromRgba32(Rgba32 source) + { + this.L = ImageMaths.Get8BitBT709Luminance(source.R, source.G, source.B); + this.A = source.A; + } + + /// + public void FromRgba64(Rgba64 source) + { + this.L = ImageMaths.Get8BitBT709Luminance( + ImageMaths.DownScaleFrom16BitTo8Bit(source.R), + ImageMaths.DownScaleFrom16BitTo8Bit(source.G), + ImageMaths.DownScaleFrom16BitTo8Bit(source.B)); + + this.A = ImageMaths.DownScaleFrom16BitTo8Bit(source.A); + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromScaledVector4(Vector4 vector) => this.ConvertFromRgbaScaledVector4(vector); + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void FromVector4(Vector4 vector) => this.ConvertFromRgbaScaledVector4(vector); + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public void ToRgba32(ref Rgba32 dest) + { + dest.R = this.L; + dest.G = this.L; + dest.B = this.L; + dest.A = this.A; + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public Vector4 ToScaledVector4() => this.ToVector4(); + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public Vector4 ToVector4() + { + const float Max = 255F; + float rgb = this.L / Max; + return new Vector4(rgb, rgb, rgb, this.A / Max); + } + + [MethodImpl(InliningOptions.ShortMethod)] + internal void ConvertFromRgbaScaledVector4(Vector4 vector) + { + vector *= MaxBytes; + vector += Half; + vector = Vector4.Clamp(vector, Vector4.Zero, MaxBytes); + this.L = ImageMaths.Get8BitBT709Luminance((byte)vector.X, (byte)vector.Y, (byte)vector.Z); + this.A = (byte)vector.W; + } + } +}