image-js/lib/filters/flipY.js

Image processing and manipulation in JavaScript

import checkProcessable from '../utils/validators/checkProcessable.js';
/**
 * Apply a flipY filter to an image.
 * @param image - Image to process.
 * @returns The processed image.
 */
export default function flipY(image) {
    checkProcessable(image, {
        bitDepth: [8, 16],
    });
    for (let row = 0; row < Math.floor(image.height / 2); row++) {
        for (let column = 0; column < image.width; column++) {
            const currentRow = row;
            const oppositeRow = image.height - row - 1;
            for (let channel = 0; channel < image.channels; channel++) {
                const tmp = image.getValue(column, currentRow, channel);
                image.setValue(column, currentRow, channel, image.getValue(column, oppositeRow, channel));
                image.setValue(column, oppositeRow, channel, tmp);
            }
        }
    }
    return image;
}
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