@abextm/cache2/dist/loaders/Underlay.js

Utilities for reading OSRS "caches"

import { PerFileLoadable } from "../Loadable.js";
import { Typed } from "../reflect.js";
export class Underlay extends PerFileLoadable {
    id;
    constructor(id) {
        super();
        this.id = id;
    }
    static index = 2;
    static archive = 1;
    rgb = 0;
    hsl;
    static decode(reader, id) {
        const v = new Underlay(id);
        for (let opcode; (opcode = reader.u8()) != 0;) {
            switch (opcode) {
                case 1:
                    v.rgb = reader.u24();
                    break;
                default:
                    throw new Error(`unknown enum opcode ${opcode}`);
            }
        }
        v.hsl = new UnderlayHSL(v.rgb);
        return v;
    }
}
export class UnderlayHSL {
    hue;
    sat;
    lum;
    hueMultiplier;
    constructor(rgb) {
        let r = ((rgb >> 16) & 255) / 256;
        let g = ((rgb >> 8) & 255) / 256;
        let b = (rgb & 255) / 256;
        let cMin = Math.min(r, g, b);
        let cMax = Math.max(r, g, b);
        let hue = 0;
        let sat = 0;
        let lum = (cMin + cMax) / 2;
        if (cMax != cMin) {
            if (lum < 0.5) {
                sat = (cMax - cMin) / (cMax + cMin);
            }
            if (lum >= 0.5) {
                sat = (cMax - cMin) / (2 - cMax - cMin);
            }
            if (cMax == r) {
                hue = (g - b) / (cMax - cMin);
            }
            else if (cMax == g) {
                hue = (b - r) / (cMax - cMin) + 2;
            }
            else if (cMax == b) {
                hue = (r - g) / (cMax - cMin) + 4;
            }
        }
        hue /= 6;
        this.sat = ~~(256 * sat);
        this.lum = ~~(256 * lum);
        if (this.sat < 0) {
            this.sat = 0;
        }
        else if (this.sat > 255) {
            this.sat = 255;
        }
        if (this.lum < 0) {
            this.lum = 0;
        }
        else if (this.lum > 255) {
            this.lum = 255;
        }
        if (lum > 0.5) {
            this.hueMultiplier = ~~(512 * (1 - lum) * sat);
        }
        else {
            this.hueMultiplier = ~~(sat * lum * 512);
        }
        if (this.hueMultiplier < 1) {
            this.hueMultiplier = 1;
        }
        this.hue = ~~(this.hueMultiplier * hue);
    }
}