voluptasquisquam/src/image/roi/__tests__/mask.js

Image processing and manipulation in JavaScript

import {Image, load} from 'test/common';
import {asc as sortAsc} from 'num-sort';
import 'should';

describe('we check mask', function () {
    it('should yield the right mask size and value', function () {
        return load('BW5x5.png').then(function (img) {

            img.width.should.equal(5);
            img.height.should.equal(5);

            let roiManager = img.getRoiManager();

            let mask = img.mask({invert: true});
            roiManager.fromMask(mask);

            let roiIDs = roiManager.getRoiIds().sort(sortAsc);
            roiIDs.should.eql([-1, 1, 2]);

            let rois = roiManager.getRois();

            rois.should.be.an.instanceof(Array).and.lengthOf(3);

            rois.sort(function (a, b) {
                return a.mask.sizes[0] - b.mask.sizes[0];
            });

            rois[0].mask.sizes.should.eql([1, 1]);
            rois[1].mask.sizes.should.eql([3, 3]);
            rois[2].mask.sizes.should.eql([5, 5]);


            let roiMask = rois[0].mask;
            Array.from(roiMask.data).should.eql([128]);

            let roiFilledMask = rois[0].filledMask;
            Array.from(roiFilledMask.data).should.eql([128]);


            roiMask = rois[1].mask;
            Array.from(roiMask.data).should.eql([247, 128]);

            roiFilledMask = rois[1].filledMask;
            Array.from(roiFilledMask.data).should.eql([255, 128]);


            roiMask = rois[2].mask;
            Array.from(roiMask.data).should.eql([252, 99, 31, 128]);

            roiFilledMask = rois[2].filledMask;
            Array.from(roiFilledMask.data).should.eql([255, 255, 255, 128]);

            let centerMask = rois[0].centerMask;
            centerMask.position.should.eql([1, 1]);
            Array.from(centerMask.data).should.eql([93, 0]);

            let contourMask = rois[1].contourMask;
            contourMask.position.should.eql([1, 1]);
            Array.from(contourMask.data).should.eql([247, 128]);

            let masks = roiManager.getMasks();

            let painted = new Image(5, 5);
            painted.paintMasks(masks);

            Array.from(painted.data).slice(0, 8).should.eql([255, 0, 0, 255, 255, 0, 0, 255]);
        });
    });
});