osrscachereader/src/cacheReader/loaders/OverlayLoader.js

Read Old-School Runescape Cache files

/**
 * Used for Map tiles
 * @class ObjectDefinition
 * @category Definitions
 * @hideconstructor
 */
export class OverlayDefinition {
    /**
     * The ID of this Overlay
     * @type {number}
     */
    id;

    /**
     * RGB Colour
     * @type {number}
     */
    color = 0;

    /**
     * Overlay texture
     * @type {number}
     */
    texture = -1;

    /**
     * Hide UnderlayDefinition
     * @type {boolean}
     */
    hideUnderlay = true;

    /**
     * RGB Colour
     * @type {number}
     */
    secondaryColor = -1;
}

export default class OverlayLoader {
    load(bytes, id) {
        let def = new OverlayDefinition();
        def.id = id;
        let dataview = new DataView(bytes.buffer);
        do {
            var opcode = dataview.readUint8();
            this.handleOpcode(def, opcode, dataview);
        } while (opcode != 0);

        def.color = this.convertToHsl(def.color);
        return def;
    }

    handleOpcode(def, opcode, dataview) {
        if (opcode == 0) {
            return;
        }

        if (opcode == 1) {
            def.color = dataview.readInt24();
        } else if (opcode == 2) {
            def.texture = dataview.readUint8();
        } else if (opcode == 5) {
            def.hideUnderlay = false;
        } else if (opcode == 7) {
            def.secondaryColor = dataview.readInt24();
        }
    }

    convertToHsl(var1) {
        let var2 = ((var1 >> 16) & 255) / 256;
        let var4 = ((var1 >> 8) & 255) / 256;
        let var6 = (var1 & 255) / 256;

        let var8 = var2;
        if (var4 < var2) {
            var8 = var4;
        }

        if (var6 < var8) {
            var8 = var6;
        }

        let var10 = var2;
        if (var4 > var2) {
            var10 = var4;
        }

        if (var6 > var10) {
            var10 = var6;
        }

        let var12 = 0;
        let var14 = 0;
        let var16 = (var10 + var8) / 2;
        if (var8 != var10) {
            if (var16 < 0.5) {
                var14 = (var10 - var8) / (var8 + var10);
            }

            if (var16 >= 0.5) {
                var14 = (var10 - var8) / (2 - var10 - var8);
            }

            if (var10 == var2) {
                var12 = (var4 - var6) / (var10 - var8);
            } else if (var4 == var10) {
                var12 = 2 + (var6 - var2) / (var10 - var8);
            } else if (var10 == var6) {
                var12 = 4 + (var2 - var4) / (var10 - var8);
            }
        }

        var12 /= 6;
        let hue = Math.floor(var12 * 64);
        let saturation = Math.floor(var14 * 8);
        let lightness = Math.floor(var16 * 128);

        if (saturation < 0) {
            saturation = 0;
        } else if (saturation > 7) {
            saturation = 7;
        }

        if (lightness < 0) {
            lightness = 0;
        } else if (lightness > 127) {
            lightness = 127;
        }

        //console.log(((hue << 10) | (saturation << 7) | lightness), hue, saturation, lightness);
        return (hue << 10) | (saturation << 7) | lightness;
    }
}