sharp/test/unit/alpha.js
Lovell Fuller cdb2894bd9 Use libvips' new lanczos3 kernel as default for image reduce
Deprecate interpolateWith method, now provided as an option
2016-05-18 19:57:22 +01:00

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'use strict';
var assert = require('assert');
var fixtures = require('../fixtures');
var sharp = require('../../index');
describe('Alpha transparency', function() {
it('Flatten to black', function(done) {
sharp(fixtures.inputPngWithTransparency)
.flatten()
.resize(400, 300)
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual(400, info.width);
assert.strictEqual(300, info.height);
fixtures.assertSimilar(fixtures.expected('flatten-black.jpg'), data, done);
});
});
it('Flatten to RGB orange', function(done) {
sharp(fixtures.inputPngWithTransparency)
.flatten()
.background({r: 255, g: 102, b: 0})
.resize(400, 300)
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual(400, info.width);
assert.strictEqual(300, info.height);
fixtures.assertSimilar(fixtures.expected('flatten-orange.jpg'), data, done);
});
});
it('Flatten to CSS/hex orange', function(done) {
sharp(fixtures.inputPngWithTransparency)
.flatten()
.background('#ff6600')
.resize(400, 300)
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual(400, info.width);
assert.strictEqual(300, info.height);
fixtures.assertSimilar(fixtures.expected('flatten-orange.jpg'), data, done);
});
});
it('Flatten 16-bit PNG with transparency to orange', function(done) {
var output = fixtures.path('output.flatten-rgb16-orange.jpg');
sharp(fixtures.inputPngWithTransparency16bit)
.flatten()
.background({r: 255, g: 102, b: 0})
.toFile(output, function(err, info) {
if (err) throw err;
assert.strictEqual(true, info.size > 0);
assert.strictEqual(32, info.width);
assert.strictEqual(32, info.height);
fixtures.assertMaxColourDistance(output, fixtures.expected('flatten-rgb16-orange.jpg'), 25);
done();
});
});
it('Do not flatten', function(done) {
sharp(fixtures.inputPngWithTransparency)
.flatten(false)
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual('png', info.format);
assert.strictEqual(4, info.channels);
done();
});
});
it('Ignored for JPEG', function(done) {
sharp(fixtures.inputJpg)
.background('#ff0000')
.flatten()
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(3, info.channels);
done();
});
});
it('Enlargement with non-nearest neighbor interpolation shouldnt cause dark edges', function(done) {
var BASE_NAME = 'alpha-premultiply-enlargement-2048x1536-paper.png';
var actual = fixtures.path('output.' + BASE_NAME);
var expected = fixtures.expected(BASE_NAME);
sharp(fixtures.inputPngAlphaPremultiplicationSmall)
.resize(2048, 1536)
.toFile(actual, function(err) {
if (err) {
done(err);
} else {
fixtures.assertMaxColourDistance(actual, expected, 102);
done();
}
});
});
it('Reduction with non-nearest neighbor interpolation shouldnt cause dark edges', function(done) {
var BASE_NAME = 'alpha-premultiply-reduction-1024x768-paper.png';
var actual = fixtures.path('output.' + BASE_NAME);
var expected = fixtures.expected(BASE_NAME);
sharp(fixtures.inputPngAlphaPremultiplicationLarge)
.resize(1024, 768)
.toFile(actual, function(err) {
if (err) {
done(err);
} else {
fixtures.assertMaxColourDistance(actual, expected, 102);
done();
}
});
});
});