StyleBoxExtensions.cs

// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.

using System.Numerics;
using Content.AL.UIKit.Colorspace;
using Content.AL.UIKit.Interfaces;
using Content.AL.UIKit.Styleboxes;
using Robust.Client.Graphics;

namespace Content.AL.UIKit;

[PublicAPI]
public static class StyleBoxExtensions
{
    public static float Luminance(this StyleBox? box)
    {
        switch (box)
        {
            case StyleBoxFlat flat:
                return new OklabColor(flat.BackgroundColor).L;
            case StyleBoxTexture tex:
            {
                var texture = tex.Texture!;
                var pix = texture.GetPixel(texture.Width / 2, texture.Height / 2) * tex.Modulate;
                return new OklabColor(pix).L;
            }
            case IBrightnessAware b:
                return b.Luminance();
            case null:
                return 0.0f;
            default:
                throw new NotImplementedException($"Not yet implemented for a stylebox of type {box.GetType()}");
        }
    }

    public static StyleboxExtruded Extrude(this StyleBox box, Vector2 by, StyleBox? extrusion = default, Color? modulation = default)
    {
        var b = new StyleboxExtruded(box, by, extrusion, modulation);
        return b;
    }

    public static StyleBoxHSkew Skew(this StyleBox box, Angle by)
    {
        return new StyleBoxHSkew(box, (float)by.Reduced().Theta);
    }

}