52 lines
2.3 KiB
JavaScript
52 lines
2.3 KiB
JavaScript
import assert from "node:assert/strict";
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import { readFileSync } from "node:fs";
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import { test } from "node:test";
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import ts from "typescript";
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import { parseHTML } from "linkedom";
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const source = readFileSync(new URL("../src/player/movie.ts", import.meta.url), "utf8");
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const { outputText } = ts.transpileModule(source, { compilerOptions: { target: ts.ScriptTarget.ES2022, module: ts.ModuleKind.ESNext } });
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const { applyMovieMask, movieDisplayable } = await import(`data:text/javascript;base64,${Buffer.from(outputText).toString("base64")}`);
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test("video opacity uses the mask's red channel and retains existing transparency", () => {
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const pixels = new Uint8ClampedArray([200, 10, 20, 255, 30, 40, 50, 128]);
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applyMovieMask(pixels, new Uint8ClampedArray([0, 255, 255, 255, 128, 0, 0, 255]));
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assert.deepEqual([...pixels], [200, 10, 20, 0, 30, 40, 50, 64]);
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});
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test("masked movie composites frames, synchronizes the mask and stops when removed", () => {
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const { document } = parseHTML("<!doctype html><html><body></body></html>");
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globalThis.document = document;
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const create = document.createElement.bind(document);
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const videos = [], frames = [], painted = [];
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let canvases = 0;
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globalThis.requestAnimationFrame = (callback) => frames.push(callback);
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document.createElement = (name) => {
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const element = create(name);
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if (name === "video") {
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Object.assign(element, { readyState: 2, videoWidth: 2, videoHeight: 1, currentTime: 0, ended: false,
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play: () => Promise.resolve(), pause: () => { element.paused = true; } });
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videos.push(element);
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}
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if (name === "canvas") {
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const mask = canvases++ > 0;
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element.getContext = () => ({ clearRect() {}, drawImage() {},
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getImageData: () => ({ data: new Uint8ClampedArray(mask
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? [0, 0, 0, 255, 128, 128, 128, 255] : [200, 10, 20, 255, 30, 40, 50, 255]) }),
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putImageData: (image) => painted.push([...image.data]),
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});
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}
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return element;
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};
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const canvas = movieDisplayable("/movie.webm", "/mask.webm", false);
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document.body.append(canvas);
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videos[1].currentTime = 2;
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frames.shift()();
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assert.deepEqual(painted[0], [200, 10, 20, 0, 30, 40, 50, 128]);
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assert.equal(videos[1].currentTime, 0);
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canvas.remove();
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frames.shift()();
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assert.ok(videos.every((video) => video.paused));
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assert.equal(frames.length, 0);
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});
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