82 lines
2.7 KiB
C#
Executable File
82 lines
2.7 KiB
C#
Executable File
using System.Buffers.Binary;
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using System.Numerics;
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namespace HellionChat.Util;
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internal static class ColourUtil {
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private static (byte r, byte g, byte b) RgbaToRgbComponents(uint rgba)
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{
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var r = (byte) ((rgba & 0xFF000000) >> 24);
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var g = (byte) ((rgba & 0xFF0000) >> 16);
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var b = (byte) ((rgba & 0xFF00) >> 8);
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return (r, g, b);
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}
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internal static uint RgbaToAbgr(uint rgba) => BinaryPrimitives.ReverseEndianness(rgba);
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internal static Vector3 RgbaToVector3(uint rgba)
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{
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var (r, g, b) = RgbaToRgbComponents(rgba);
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return new Vector3((float) r / 255, (float) g / 255, (float) b / 255);
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}
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internal static uint Vector3ToRgba(Vector3 col)
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{
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return ComponentsToRgba(
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(byte) Math.Round(col.X * 255),
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(byte) Math.Round(col.Y * 255),
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(byte) Math.Round(col.Z * 255)
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);
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}
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internal static uint Vector4ToAbgr(Vector4 col)
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{
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return RgbaToAbgr(ComponentsToRgba(
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(byte) Math.Round(col.X * 255),
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(byte) Math.Round(col.Y * 255),
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(byte) Math.Round(col.Z * 255),
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(byte) Math.Round(col.W * 255)
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));
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}
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public static unsafe uint ArgbToRgba(uint x)
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{
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var buf = (byte*)&x;
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(buf[1], buf[2], buf[3], buf[0]) = (buf[0], buf[1], buf[2], buf[3]);
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return x;
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}
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internal static uint ComponentsToRgba(byte red, byte green, byte blue, byte alpha = 0xFF)
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=> alpha | (uint) (red << 24) | (uint) (green << 16) | (uint) (blue << 8);
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internal static uint AdjustBrightness(uint abgr, float factor)
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{
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var a = (byte) ((abgr & 0xFF000000) >> 24);
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var b = (byte) ((abgr & 0x00FF0000) >> 16);
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var g = (byte) ((abgr & 0x0000FF00) >> 8);
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var r = (byte) (abgr & 0x000000FF);
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var nr = (byte) Math.Clamp(r * factor, 0f, 255f);
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var ng = (byte) Math.Clamp(g * factor, 0f, 255f);
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var nb = (byte) Math.Clamp(b * factor, 0f, 255f);
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return ((uint) a << 24) | ((uint) nb << 16) | ((uint) ng << 8) | nr;
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}
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public static uint HexToRgba(string hex)
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{
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ArgumentNullException.ThrowIfNull(hex);
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var s = hex.StartsWith('#') ? hex[1..] : hex;
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if (s.Length != 6 && s.Length != 8)
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throw new FormatException($"Hex colour must be 6 or 8 hex digits, got {s.Length}: '{hex}'");
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if (!uint.TryParse(s, System.Globalization.NumberStyles.HexNumber, System.Globalization.CultureInfo.InvariantCulture, out var value))
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throw new FormatException($"Hex colour '{hex}' is not a valid hexadecimal value");
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if (s.Length == 6)
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value = (value << 8) | 0xFFu; // RRGGBB → RRGGBBFF
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return value;
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}
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}
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