sharp/test/unit/bandbool.js

'use strict';

var assert = require('assert');
var fixtures = require('../fixtures');
var sharp = require('../../index');

describe('Bandbool per-channel boolean operations', function() {

  [
    sharp.bool.and,
    sharp.bool.or,
    sharp.bool.eor
  ]
  .forEach(function(op) {
    it(op + ' operation', function(done) {
      sharp(fixtures.inputPngBooleanNoAlpha)
        .bandbool(op)
        .toColourspace('b-w')
        .toBuffer(function(err, data, info) {
          if (err) throw err;
          assert.strictEqual(200, info.width);
          assert.strictEqual(200, info.height);
          assert.strictEqual(1, info.channels);
          fixtures.assertSimilar(fixtures.expected('bandbool_' + op + '_result.png'), data, done);
        });
    });
  });

  it('sRGB image retains 3 channels', function(done) {
    sharp(fixtures.inputJpg)
      .bandbool('and')
      .toBuffer(function(err, data, info) {
        assert.strictEqual(3, info.channels);
        done();
      });
  });          

  it('Invalid operation', function() {
    assert.throws(function() {
      sharp().bandbool('fail');
    });
  });

  it('Missing operation', function() {
    assert.throws(function() {
      sharp().bandbool();
    });
  });
});