mini_amp_screen_repro.js
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mini_amp_screen_repro.js
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	function e4(char = " ", style = {}, width = 1, hyperlink) {
	return { char, style: { ...style }, width, hyperlink };
	}

	const bw = e4(" ", {});

	function sameColor(a, b) {
	if (a === b) return true;
	if (a === void 0 \|\| b === void 0) return false;
	if (a.type !== b.type) return false;
	if (a.alpha !== b.alpha) return false;
	if (a.type === "index") return a.value === b.value;
	if (a.type === "rgb")
	return a.value.r === b.value.r && a.value.g === b.value.g && a.value.b === b.value.b;
	return true;
	}

	function sameStyle(a, b) {
	return (
	sameColor(a.fg, b.fg) &&
	sameColor(a.bg, b.bg) &&
	a.bold === b.bold &&
	a.italic === b.italic &&
	a.underline === b.underline &&
	a.strikethrough === b.strikethrough &&
	a.reverse === b.reverse &&
	a.dim === b.dim
	);
	}

	function sameCell(a, b) {
	return (
	a.char === b.char &&
	a.width === b.width &&
	sameStyle(a.style, b.style) &&
	a.hyperlink === b.hyperlink
	);
	}

	class BufferGrid {
	constructor(width, height) {
	this.width = width;
	this.height = height;
	this.resize(width, height);
	}
	resize(width, height) {
	this.width = width;
	this.height = height;
	this.cells = Array(height).fill(null).map(() => Array(width).fill(null).map(() => bw));
	}
	setCell(x, y, cell) {
	this.cells[y][x] = { ...cell, style: { ...cell.style } };
	}
	getCell(x, y) {
	return this.cells[y][x];
	}
	clear() {
	for (let y = 0; y < this.height; y++) {
	for (let x = 0; x < this.width; x++) this.cells[y][x] = bw;
	}
	}
	rowString(y) {
	let out = "";
	for (let x = 0; x < this.width; x++) out += this.cells[y][x].char;
	return out;
	}
	}

	class Screen {
	constructor(width, height) {
	this.width = width;
	this.height = height;
	this.frontBuffer = new BufferGrid(width, height);
	this.backBuffer = new BufferGrid(width, height);
	}
	getBuffer() {
	return this.backBuffer;
	}
	clear() {
	this.backBuffer.clear();
	}
	setCell(x, y, cell) {
	this.backBuffer.setCell(x, y, cell);
	}
	getDiff() {
	const diff = [];
	for (let y = 0; y < this.height; y++) {
	for (let x = 0; x < this.width; x++) {
	const a = this.frontBuffer.getCell(x, y);
	const b = this.backBuffer.getCell(x, y);
	if (!sameCell(a, b)) diff.push({ x, y, cell: b });
	}
	}
	return diff;
	}
	present() {
	const old = this.frontBuffer;
	this.frontBuffer = this.backBuffer;
	this.backBuffer = old;
	}
	}

	function drawText(screen, x, y, text) {
	for (let i = 0; i < text.length; i++) {
	screen.setCell(x + i, y, e4(text[i], { fg: { type: "index", value: 7 } }));
	}
	}

	const screen = new Screen(20, 4);

	for (let frame = 0; frame < 5; frame++) {
	screen.clear();
	drawText(screen, 0, 0, "frame:" + frame);
	drawText(screen, 0, 1, "ball:" + " ".repeat(frame) + "o");
	const diff = screen.getDiff();
	console.log(JSON.stringify({
	frame,
	diffCount: diff.length,
	row0: screen.backBuffer.rowString(0),
	row1: screen.backBuffer.rowString(1),
	}));
	screen.present();
	}

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Mime Type: text/x-c++
Expires: Sat, May 2, 6:53 AM (2 d)
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Storage Format: Raw Data
Storage Handle: 544027
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