@fdm-monster/server/dist/utils/bgcode/qoi-decoder.js

FDM Monster is a bulk OctoPrint, Klipper, PrusaLink and BambuLab manager to set up, configure and monitor 3D printers. Our aim is to provide neat overview over your farm.

//#region src/utils/bgcode/qoi-decoder.ts
const QOI_OP_INDEX = 0;
const QOI_OP_DIFF = 64;
const QOI_OP_LUMA = 128;
const QOI_OP_RUN = 192;
const QOI_OP_RGB = 254;
const QOI_OP_RGBA = 255;
const QOI_MAGIC = 1903126886;
function hashColor(r, g, b, a) {
	return (r * 3 + g * 5 + b * 7 + a * 11) % 64;
}
function decodeQOI(buffer) {
	let pos = 0;
	if (buffer.length < 14) throw new Error("Invalid QOI file: too short");
	const magic = buffer.readUInt32BE(pos);
	pos += 4;
	if (magic !== QOI_MAGIC) throw new Error(`Invalid QOI magic: expected ${QOI_MAGIC.toString(16)}, got ${magic.toString(16)}`);
	const width = buffer.readUInt32BE(pos);
	pos += 4;
	const height = buffer.readUInt32BE(pos);
	pos += 4;
	const channels = buffer.readUInt8(pos);
	pos += 1;
	const colorspace = buffer.readUInt8(pos);
	pos += 1;
	if (channels !== 3 && channels !== 4) throw new Error(`Invalid QOI channels: ${channels}`);
	const outputSize = width * height * 4;
	const output = Buffer.alloc(outputSize);
	const colorArray = new Array(64);
	for (let i = 0; i < 64; i++) colorArray[i] = [
		0,
		0,
		0,
		0
	];
	let r = 0;
	let g = 0;
	let b = 0;
	let a = 255;
	let outPos = 0;
	while (outPos < outputSize) {
		if (pos + 8 <= buffer.length) {
			let isEnd = true;
			for (let i = 0; i < 7; i++) if (buffer[pos + i] !== 0) {
				isEnd = false;
				break;
			}
			if (isEnd && buffer[pos + 7] === 1) break;
		}
		if (pos >= buffer.length) throw new Error("Unexpected end of QOI data");
		const byte1 = buffer[pos++];
		if (byte1 === QOI_OP_RGB) {
			r = buffer[pos++];
			g = buffer[pos++];
			b = buffer[pos++];
		} else if (byte1 === QOI_OP_RGBA) {
			r = buffer[pos++];
			g = buffer[pos++];
			b = buffer[pos++];
			a = buffer[pos++];
		} else {
			const tag = byte1 & 192;
			if (tag === QOI_OP_INDEX) {
				const index = byte1 & 63;
				[r, g, b, a] = colorArray[index];
			} else if (tag === QOI_OP_DIFF) {
				const dr = (byte1 >> 4 & 3) - 2;
				const dg = (byte1 >> 2 & 3) - 2;
				const db = (byte1 & 3) - 2;
				r = r + dr & 255;
				g = g + dg & 255;
				b = b + db & 255;
			} else if (tag === QOI_OP_LUMA) {
				const byte2 = buffer[pos++];
				const dg = (byte1 & 63) - 32;
				const dr_dg = (byte2 >> 4 & 15) - 8;
				const db_dg = (byte2 & 15) - 8;
				g = g + dg & 255;
				r = r + dg + dr_dg & 255;
				b = b + dg + db_dg & 255;
			} else if (tag === QOI_OP_RUN) {
				const run = (byte1 & 63) + 1;
				for (let i = 0; i < run; i++) {
					output[outPos++] = r;
					output[outPos++] = g;
					output[outPos++] = b;
					output[outPos++] = a;
				}
				const hash = hashColor(r, g, b, a);
				colorArray[hash] = [
					r,
					g,
					b,
					a
				];
				continue;
			}
		}
		output[outPos++] = r;
		output[outPos++] = g;
		output[outPos++] = b;
		output[outPos++] = a;
		const hash = hashColor(r, g, b, a);
		colorArray[hash] = [
			r,
			g,
			b,
			a
		];
	}
	return {
		width,
		height,
		channels,
		colorspace,
		data: output
	};
}
//#endregion
export { decodeQOI };

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