image-js/lib/operations/paintMaskOnImage.js

Image processing and manipulation in JavaScript

import { getDefaultColor } from '../utils/getDefaultColor.js';
import { getOutputImage } from '../utils/getOutputImage.js';
import { setBlendedPixel } from '../utils/setBlendedPixel.js';
import { checkPointIsInteger } from '../utils/validators/checkPointIsInteger.js';
/**
 * Paint a mask onto an image and the given position and with the given color.
 * @param image - Image on which to paint the mask.
 * @param mask - Mask to paint on the image.
 * @param options - Paint mask options.
 * @returns The painted image.
 */
export function paintMaskOnImage(image, mask, options = {}) {
    const { origin = { row: 0, column: 0 }, color = getDefaultColor(image), blend = true, } = options;
    const { column, row } = origin;
    if (color.length !== image.channels) {
        throw new RangeError('the given color is not compatible with the image');
    }
    checkPointIsInteger(origin, 'Origin');
    const result = getOutputImage(image, options, { clone: true });
    if (blend) {
        checkColorIsNumberArray(color);
        for (let currentRow = Math.max(row, 0); currentRow < Math.min(mask.height + row, image.height); currentRow++) {
            for (let currentColumn = Math.max(column, 0); currentColumn < Math.min(mask.width + column, image.width); currentColumn++) {
                if (mask.getBit(currentColumn - column, currentRow - row)) {
                    setBlendedPixel(result, currentColumn, currentRow, color);
                }
            }
        }
    }
    else {
        for (let currentRow = Math.max(row, 0); currentRow < Math.min(mask.height + row, image.height); currentRow++) {
            for (let currentColumn = Math.max(column, 0); currentColumn < Math.min(mask.width + column, image.width); currentColumn++) {
                if (mask.getBit(currentColumn - column, currentRow - row)) {
                    for (let channel = 0; channel < image.channels; channel++) {
                        const currentValue = color[channel];
                        if (typeof currentValue === 'number') {
                            result.setValue(currentColumn, currentRow, channel, currentValue);
                        }
                    }
                }
            }
        }
    }
    return result;
}
function checkColorIsNumberArray(color) {
    for (const channel of color) {
        if (typeof channel !== 'number') {
            throw new TypeError('cannot have null channels in color if blend is true');
        }
    }
}
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