image-js/lib/utils/borderIterator.js

Image processing and manipulation in JavaScript

/**
 * Create function that allows to iterate on the pixels of the border of an image.
 * @param image - Image for which to create the border iterator.
 * @yields - Index of the border pixel.
 */
export function* borderIterator(image) {
    for (let col = 0; col < image.width; col++) {
        yield col;
    }
    for (let row = 2; row < image.height; row++) {
        yield row * image.width - 1;
    }
    for (let col = 0; col < image.width; col++) {
        yield image.width * image.height - col - 1;
    }
    for (let row = image.height - 2; row >= 1; row--) {
        yield row * image.width;
    }
}
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