@spearwolf/twopoint5d/lib/texture/PowerOf2ImageLoader.js

a library to create 2.5d realtime graphics and pixelart with three.js

import { ImageLoader } from 'three';
import { findNextPowerOf2 } from '../utils/findNextPowerOf2.js';
import { isPowerOf2 } from '../utils/isPowerOf2.js';
import { TextureCoords } from './TextureCoords.js';
export class PowerOf2ImageLoader {
    #imageLoader;
    get imageLoader() {
        if (!this.#imageLoader) {
            this.#imageLoader = new ImageLoader();
        }
        return this.#imageLoader;
    }
    set imageLoader(loader) {
        this.#imageLoader = loader;
    }
    load(url, onLoadCallback, onErrorCallback) {
        this.imageLoader.load(url, (img) => {
            if (!isPowerOf2(img.width) || !isPowerOf2(img.height)) {
                const width = findNextPowerOf2(img.width);
                const height = findNextPowerOf2(img.height);
                const canvas = document.createElement('canvas');
                canvas.width = width;
                canvas.height = height;
                canvas.getContext('2d').drawImage(img, 0, 0);
                const imgTexCoords = new TextureCoords(0, 0, width, height);
                const texCoords = new TextureCoords(imgTexCoords, 0, 0, img.width, img.height);
                onLoadCallback({ imgEl: canvas, texCoords });
            }
            else {
                onLoadCallback({
                    imgEl: img,
                    texCoords: new TextureCoords(0, 0, img.width, img.height),
                });
            }
        }, undefined, onErrorCallback);
    }
    loadAsync(url) {
        return new Promise((resolve, reject) => {
            this.load(url, resolve, reject);
        });
    }
}
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