93 lines
2.6 KiB
C#
93 lines
2.6 KiB
C#
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace Uwaa.PNG;
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/// <summary>
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/// A 32-bit RGBA pixel in a <see cref="Png"/> image.
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/// </summary>
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[StructLayout(LayoutKind.Sequential)]
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public readonly struct Pixel : IEquatable<Pixel>
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{
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/// <summary>
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/// The red value for the pixel.
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/// </summary>
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public byte R { get; }
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/// <summary>
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/// The green value for the pixel.
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/// </summary>
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public byte G { get; }
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/// <summary>
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/// The blue value for the pixel.
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/// </summary>
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public byte B { get; }
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/// <summary>
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/// The alpha transparency value for the pixel.
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/// </summary>
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public byte A { get; }
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/// <summary>
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/// Create a new <see cref="Pixel"/>.
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/// </summary>
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/// <param name="r">The red value for the pixel.</param>
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/// <param name="g">The green value for the pixel.</param>
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/// <param name="b">The blue value for the pixel.</param>
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/// <param name="a">The alpha transparency value for the pixel.</param>
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public Pixel(byte r, byte g, byte b, byte a)
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{
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R = r;
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G = g;
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B = b;
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A = a;
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}
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/// <summary>
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/// Create a new <see cref="Pixel"/> which is fully opaque.
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/// </summary>
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/// <param name="r">The red value for the pixel.</param>
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/// <param name="g">The green value for the pixel.</param>
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/// <param name="b">The blue value for the pixel.</param>
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public Pixel(byte r, byte g, byte b)
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{
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R = r;
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G = g;
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B = b;
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A = 255;
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}
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/// <summary>
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/// Create a new grayscale <see cref="Pixel"/>.
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/// </summary>
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/// <param name="grayscale">The grayscale value.</param>
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public Pixel(byte grayscale)
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{
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R = grayscale;
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G = grayscale;
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B = grayscale;
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A = 255;
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}
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public override string ToString() => $"({R}, {G}, {B}, {A})";
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public override bool Equals(object? obj) => obj is Pixel pixel && Equals(pixel);
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/// <summary>
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/// Whether the pixel values are equal.
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/// </summary>
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/// <param name="other">The other pixel.</param>
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/// <returns><see langword="true"/> if all pixel values are equal otherwise <see langword="false"/>.</returns>
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public bool Equals(Pixel other)
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{
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Pixel this_ = this;
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return Unsafe.As<Pixel, uint>(ref this_) == Unsafe.As<Pixel, uint>(ref other);
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}
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public override int GetHashCode() => HashCode.Combine(R, G, B, A);
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public static bool operator ==(Pixel left, Pixel right) => left.Equals(right);
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public static bool operator !=(Pixel left, Pixel right) => !(left == right);
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}
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