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Improve readable colors algorithm and make it optional (#1072)
* Use better algorithm for adjusting color visibility * Make readable usernames configurable * Update translations * Use alternate background color when enabled * Fix readable colors preference not being saved to settings * More adjustments * Reduce javascript overhead when computing contrast ratio in HTML chats
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| using System; | ||
| using System.Numerics; | ||
| using SkiaSharp; | ||
|
|
||
| namespace TwitchDownloaderCore.Extensions | ||
| { | ||
| // ReSharper disable once InconsistentNaming | ||
| public static class SKColorExtensions | ||
| { | ||
| public static SKColor Lerp(this SKColor from, SKColor to, float factor) | ||
| { | ||
| var result = Vector4.Lerp(ToVector4(from), ToVector4(to), factor); | ||
| return FromVector4(result); | ||
|
|
||
| static Vector4 ToVector4(SKColor color) | ||
| { | ||
| var colorF = color.ToSKColorF(); | ||
| return new Vector4(colorF.Red, colorF.Green, colorF.Blue, colorF.Alpha); | ||
| } | ||
|
|
||
| static SKColor FromVector4(Vector4 color) | ||
| { | ||
| var colorF = new SKColorF(color.X, color.Y, color.Z, color.W); | ||
| return colorF.ToSKColor(); | ||
| } | ||
| } | ||
|
|
||
| // ReSharper disable once InconsistentNaming | ||
| public static SKColorF ToSKColorF(this SKColor color) | ||
| { | ||
| return new SKColorF((float)color.Red / byte.MaxValue, (float)color.Green / byte.MaxValue, (float)color.Blue / byte.MaxValue, (float)color.Alpha / byte.MaxValue); | ||
| } | ||
|
|
||
| // ReSharper disable once InconsistentNaming | ||
| public static SKColor ToSKColor(this SKColorF color) | ||
| { | ||
| return new SKColor((byte)(color.Red * byte.MaxValue), (byte)(color.Green * byte.MaxValue), (byte)(color.Blue * byte.MaxValue), (byte)(color.Alpha * byte.MaxValue)); | ||
| } | ||
|
|
||
| // https://www.w3.org/TR/WCAG21/#dfn-relative-luminance | ||
| public static double RelativeLuminance(this SKColor color) | ||
| { | ||
| var colorF = color.ToSKColorF(); | ||
| return 0.2126 * ConvertColor(colorF.Red) + 0.7152 * ConvertColor(colorF.Green) + 0.0722 * ConvertColor(colorF.Blue); | ||
|
|
||
| static double ConvertColor(float v) | ||
| { | ||
| return v <= 0.04045 | ||
| ? v / 12.92 | ||
| : Math.Pow((v + 0.055) / 1.055, 2.4); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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