Add joinChannel and toColourspace/toColorspace operations (#513)

test/unit/joinChannel.js

@@ -0,0 +1,151 @@
+'use strict';
+
+var assert = require('assert');
+var fs = require('fs');
+var sharp = require('../../index');
+var fixtures = require('../fixtures');
+var BluebirdPromise = require('bluebird');
+
+describe('Image channel insertion', function() {
+
+  it('Grayscale to RGB, buffer', function(done) {
+    sharp(fixtures.inputPng) // gray -> red
+      .resize(320, 240)
+      .joinChannel(fixtures.inputPngTestJoinChannel) // new green channel
+      .joinChannel(fixtures.inputPngStripesH)        // new blue channel
+      .toBuffer(function(err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        assert.strictEqual(3, info.channels);
+        fixtures.assertSimilar(fixtures.expected('joinChannel-rgb.jpg'), data, done);
+      });
+  });
+
+  it('Grayscale to RGB, file', function(done) {
+    sharp(fixtures.inputPng) // gray -> red
+      .resize(320, 240)
+      .joinChannel(fs.readFileSync(fixtures.inputPngTestJoinChannel)) // new green channel
+      .joinChannel(fs.readFileSync(fixtures.inputPngStripesH))        // new blue channel
+      .toBuffer(function(err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        assert.strictEqual(3, info.channels);
+        fixtures.assertSimilar(fixtures.expected('joinChannel-rgb.jpg'), data, done);
+      });
+  });
+
+  it('Grayscale to RGBA, buffer', function(done) {
+    sharp(fixtures.inputPng) // gray -> red
+      .resize(320, 240)
+      .joinChannel([fixtures.inputPngTestJoinChannel,
+                    fixtures.inputPngStripesH,
+                    fixtures.inputPngStripesV]) // new green + blue + alpha channel
+      .toColourspace(sharp.colourspace.srgb)
+      .toBuffer(function(err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        assert.strictEqual(4, info.channels);
+        fixtures.assertSimilar(fixtures.expected('joinChannel-rgba.png'), data, done);
+      });
+  });
+
+  it('Grayscale to RGBA, file', function(done) {
+    sharp(fixtures.inputPng) // gray -> red
+      .resize(320, 240)
+      .joinChannel([fs.readFileSync(fixtures.inputPngTestJoinChannel), // new green channel
+                    fs.readFileSync(fixtures.inputPngStripesH),        // new blue channel
+                    fs.readFileSync(fixtures.inputPngStripesV)])       // new alpha channel
+      .toColourspace('srgb')
+      .toBuffer(function(err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        assert.strictEqual(4, info.channels);
+        fixtures.assertSimilar(fixtures.expected('joinChannel-rgba.png'), data, done);
+      });
+  });
+
+  it('Grayscale to CMYK, buffers', function(done) {
+    sharp(fixtures.inputPng) // gray -> magenta
+      .resize(320, 240)
+      .joinChannel([fs.readFileSync(fixtures.inputPngTestJoinChannel), // new cyan channel
+                    fs.readFileSync(fixtures.inputPngStripesH),        // new yellow channel
+                    fs.readFileSync(fixtures.inputPngStripesV)])       // new black channel
+      .toColorspace('cmyk')
+      .toFormat('jpeg')
+      .toBuffer(function(err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        assert.strictEqual(4, info.channels);
+        fixtures.assertSimilar(fixtures.expected('joinChannel-cmyk.jpg'), data, done);
+      });
+  });
+
+  it('Join raw buffers to RGB', function(done) {
+    BluebirdPromise.all([
+      sharp(fixtures.inputPngTestJoinChannel).toColourspace('b-w').raw().toBuffer(),
+      sharp(fixtures.inputPngStripesH).toColourspace('b-w').raw().toBuffer()
+    ])
+      .then(function(buffers) {
+        sharp(fixtures.inputPng)
+          .resize(320, 240)
+          .joinChannel(buffers,
+                       { raw: {
+                         width: 320,
+                         height: 240,
+                         channels: 1
+                       }})
+          .toBuffer(function(err, data, info) {
+            if (err) throw err;
+            assert.strictEqual(320, info.width);
+            assert.strictEqual(240, info.height);
+            assert.strictEqual(3, info.channels);
+            fixtures.assertSimilar(fixtures.expected('joinChannel-rgb.jpg'), data, done);
+          });
+      })
+      .catch(function(err) {
+        throw err;
+      });
+  });
+
+  it('Grayscale to RGBA, files, two arrays', function(done) {
+    sharp(fixtures.inputPng) // gray -> red
+      .resize(320, 240)
+      .joinChannel([fs.readFileSync(fixtures.inputPngTestJoinChannel)]) // new green channel
+      .joinChannel([fs.readFileSync(fixtures.inputPngStripesH),         // new blue channel
+                    fs.readFileSync(fixtures.inputPngStripesV)])        // new alpha channel
+      .toColourspace('srgb')
+      .toBuffer(function(err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        assert.strictEqual(4, info.channels);
+        fixtures.assertSimilar(fixtures.expected('joinChannel-rgba.png'), data, done);
+      });
+  });
+
+  it('Invalid raw buffer description', function() {
+    assert.throws(function() {
+      sharp().joinChannel(fs.readFileSync(fixtures.inputPng),{raw:{}});
+    });
+  });
+
+  it('Invalid input', function() {
+    assert.throws(function() {
+      sharp(fixtures.inputJpg)
+        .joinChannel(1);
+    });
+  });
+
+  it('No arguments', function() {
+    assert.throws(function() {
+      sharp(fixtures.inputJpg)
+        .joinChannel();
+    });
+  });
+
+});