image-js/lib/operations/crop.js

Image processing and manipulation in JavaScript

import { Image } from '../Image.js';
import { checkPointIsInteger } from '../utils/validators/checkPointIsInteger.js';
import checkProcessable from '../utils/validators/checkProcessable.js';
/**
 * Crop the input image to a desired size.
 * @param image - Image to crop.
 * @param [options] - Crop options.
 * @returns The new cropped image.
 * @example
 * var cropped = image.crop({
 *   row:20,
 *   column:100
 * });
 */
export function crop(image, options = {}) {
    const { origin = { row: 0, column: 0 }, width = image.width - origin.column, height = image.height - origin.row, } = options;
    const { column, row } = origin;
    checkProcessable(image, {
        bitDepth: [8, 16],
    });
    checkPointIsInteger(origin, 'Origin');
    if (!Number.isInteger(width) || !Number.isInteger(height)) {
        throw new RangeError(`Width and height (width:${width}; height:${height}) must be integers`);
    }
    if (row > image.height - 1 || column > image.width - 1) {
        throw new RangeError(`Origin (row:${row}, column:${column}) out of range (${image.width - 1}; ${image.height - 1})`);
    }
    if (width <= 0 || height <= 0) {
        throw new RangeError(`Width and height (width:${width}; height:${height}) must be positive numbers`);
    }
    if (row < 0 || column < 0) {
        throw new RangeError(`Row and column (row:${row}, column:${column}) must be positive numbers`);
    }
    if (width > image.width - column || height > image.height - row) {
        throw new RangeError(`Size is out of range (row:${row}, column:${column}, width:${width}, height:${height})`);
    }
    const newImage = Image.createFrom(image, {
        width,
        height,
    });
    for (let currentRow = 0; currentRow < height; currentRow++) {
        for (let currentColumn = 0; currentColumn < width; currentColumn++) {
            newImage.setPixel(currentColumn, currentRow, image.getPixel(column + currentColumn, row + currentRow));
        }
    }
    return newImage;
}
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