voluptasquisquam/src/image/utility/getRow.js

Image processing and manipulation in JavaScript

/**
 * @memberof Image
 * @instance
 * @param {number} row
 * @param {number} [channel=0]
 * @return {number[]}
 */
export default function getRow(row, channel = 0) {
    this.checkProcessable('getRow', {
        bitDepth: [8, 16]
    });

    this.checkRow(row);
    this.checkChannel(channel);


    let array = new Array(this.width);
    let ptr = 0;
    let begin = row * this.width * this.channels + channel;
    let end = begin + this.width * this.channels;
    for (let j = begin; j < end; j += this.channels) {
        array[ptr++] = this.data[j];
    }

    return array;
}