image-js/lib/stack/utils/checkProcessable.js

Image processing and manipulation in JavaScript

import { format } from '../../utils/validators/checkProcessable.js';
/**
 * This method checks if a process can be applied on the stack.
 * @param stack - Stack to verify.
 * @param options - Check processable options.
 */
export function checkProcessable(stack, options = {}) {
    const { sameDimensions = false, alpha } = options;
    let { bitDepth } = options;
    if (sameDimensions) {
        const width = stack.getImage(0).width;
        const height = stack.getImage(0).height;
        for (let i = 1; i < stack.size; i++) {
            const currentImage = stack.getImage(i);
            if (currentImage.width !== width || currentImage.height !== height) {
                throw new RangeError(`images must all have same dimensions to apply this algorithm`);
            }
        }
    }
    if (alpha !== undefined && alpha !== stack.alpha) {
        throw new RangeError(`stack images ${alpha ? 'should' : 'should not'} have an alpha channel to apply this algorithm`);
    }
    if (bitDepth) {
        if (!Array.isArray(bitDepth)) {
            bitDepth = [bitDepth];
        }
        if (!bitDepth.includes(stack.bitDepth)) {
            throw new RangeError(`image bitDepth must be ${format(bitDepth)} to apply this algorithm`);
        }
    }
}
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