const spawn = require('child_process').spawn;

function readFromRegion(frame: Buffer, x: int, y: int, width: int, height: int) {
	const convert = spawn('convert', ['-', '-negate', '-crop', `${width}x${height}+${x}+${y}`, '-'])
	const result = new Buffer(512 * 1024)
	let resultSize = 0

	convert.stdout.on('data', (data) => {
		if (data.length + resultSize > result.length) {
			// Buffer not big enough
		} else {
			resultSize += data.length
			data.copy(result)
		}
	});

	convert.on('exit', (code) => {

	});

	convert.stdin.write(frame)
}