Basic La32 implementation.

7 years ago · 621120369e
1 changed files with 230 additions and 0 deletions
--- a/src/ImageSharp/PixelFormats/PixelImplementations/La32.cs
+++ b/src/ImageSharp/PixelFormats/PixelImplementations/La32.cs
@ -0,0 +1,230 @@
+// 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
+{
+    /// <summary>
+    /// Packed pixel type containing two 16-bit normalized values representing luminance and alpha.
+    /// <para>
+    /// Ranges from [0, 0, 0, 0] to [1, 1, 1, 1] in vector form.
+    /// </para>
+    /// </summary>
+    [StructLayout(LayoutKind.Explicit)]
+    public struct La32 : IPixel<La32>, IPackedVector<uint>
+    {
+        private const float Max = ushort.MaxValue;
+
+        /// <summary>
+        /// Gets or sets the luminance component.
+        /// </summary>
+        [FieldOffset(0)]
+        public ushort L;
+
+        /// <summary>
+        /// Gets or sets the alpha component.
+        /// </summary>
+        [FieldOffset(2)]
+        public ushort A;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="La32"/> struct.
+        /// </summary>
+        /// <param name="l">The luminance component.</param>
+        /// <param name="a">The alpha componant.</param>
+        public La32(ushort l, ushort a)
+        {
+            this.L = l;
+            this.A = a;
+        }
+
+        /// <inheritdoc/>
+        public uint PackedValue
+        {
+            get => Unsafe.As<La32, uint>(ref this);
+
+            set => Unsafe.As<La32, uint>(ref this) = value;
+        }
+
+        /// <summary>
+        /// Compares two <see cref="La32"/> objects for equality.
+        /// </summary>
+        /// <param name="left">The <see cref="La32"/> on the left side of the operand.</param>
+        /// <param name="right">The <see cref="La32"/> on the right side of the operand.</param>
+        /// <returns>
+        /// True if the <paramref name="left"/> parameter is equal to the <paramref name="right"/> parameter; otherwise, false.
+        /// </returns>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public static bool operator ==(La32 left, La32 right) => left.Equals(right);
+
+        /// <summary>
+        /// Compares two <see cref="La32"/> objects for equality.
+        /// </summary>
+        /// <param name="left">The <see cref="La32"/> on the left side of the operand.</param>
+        /// <param name="right">The <see cref="La32"/> on the right side of the operand.</param>
+        /// <returns>
+        /// True if the <paramref name="left"/> parameter is not equal to the <paramref name="right"/> parameter; otherwise, false.
+        /// </returns>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public static bool operator !=(La32 left, La32 right) => !left.Equals(right);
+
+        /// <inheritdoc/>
+        public PixelOperations<La32> CreatePixelOperations() => new PixelOperations<La32>();
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public bool Equals(La32 other) => this.PackedValue.Equals(other.PackedValue);
+
+        /// <inheritdoc />
+        public override bool Equals(object obj) => obj is La32 other && this.Equals(other);
+
+        /// <inheritdoc />
+        public override string ToString() => $"La32({this.L}, {this.A})";
+
+        /// <inheritdoc />
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public override int GetHashCode() => this.PackedValue.GetHashCode();
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromArgb32(Argb32 source)
+        {
+            this.L = ImageMaths.Get16BitBT709Luminance(
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.R),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.G),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.B));
+
+            this.A = ImageMaths.UpscaleFrom8BitTo16Bit(source.A);
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromBgr24(Bgr24 source)
+        {
+            this.L = ImageMaths.Get16BitBT709Luminance(
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.R),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.G),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.B));
+
+            this.A = ushort.MaxValue;
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromBgra32(Bgra32 source)
+        {
+            this.L = ImageMaths.Get16BitBT709Luminance(
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.R),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.G),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.B));
+
+            this.A = ImageMaths.UpscaleFrom8BitTo16Bit(source.A);
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromBgra5551(Bgra5551 source) => this.FromScaledVector4(source.ToScaledVector4());
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromL16(L16 source)
+        {
+            this.L = source.PackedValue;
+            this.A = ushort.MaxValue;
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromL8(L8 source)
+        {
+            this.L = ImageMaths.UpscaleFrom8BitTo16Bit(source.PackedValue);
+            this.A = ushort.MaxValue;
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromRgb24(Rgb24 source)
+        {
+            this.L = ImageMaths.Get16BitBT709Luminance(
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.R),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.G),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.B));
+
+            this.A = ushort.MaxValue;
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromRgb48(Rgb48 source)
+        {
+            this.L = ImageMaths.Get16BitBT709Luminance(source.R, source.G, source.B);
+            this.A = ushort.MaxValue;
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromRgba32(Rgba32 source)
+        {
+            this.L = ImageMaths.Get16BitBT709Luminance(
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.R),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.G),
+                ImageMaths.UpscaleFrom8BitTo16Bit(source.B));
+
+            this.A = ImageMaths.UpscaleFrom8BitTo16Bit(source.A);
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromRgba64(Rgba64 source)
+        {
+            this.L = ImageMaths.Get16BitBT709Luminance(source.R, source.G, source.B);
+            this.A = source.A;
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromScaledVector4(Vector4 vector) => this.ConvertFromRgbaScaledVector4(vector);
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void FromVector4(Vector4 vector) => this.ConvertFromRgbaScaledVector4(vector);
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void ToRgba32(ref Rgba32 dest)
+        {
+            byte rgb = ImageMaths.DownScaleFrom16BitTo8Bit(this.L);
+            dest.R = rgb;
+            dest.G = rgb;
+            dest.B = rgb;
+            dest.A = ImageMaths.DownScaleFrom16BitTo8Bit(this.A);
+        }
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public Vector4 ToScaledVector4() => this.ToVector4();
+
+        /// <inheritdoc/>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public Vector4 ToVector4()
+        {
+            float scaled = this.L / Max;
+            return new Vector4(scaled, scaled, scaled, this.A / Max);
+        }
+
+        [MethodImpl(InliningOptions.ShortMethod)]
+        internal void ConvertFromRgbaScaledVector4(Vector4 vector)
+        {
+            vector = Vector4.Clamp(vector, Vector4.Zero, Vector4.One) * Max;
+            this.L = ImageMaths.Get16BitBT709Luminance(
+                vector.X,
+                vector.Y,
+                vector.Z);
+
+            this.A = (ushort)vector.W;
+        }
+    }
+}