Add 'fast' blur and Gaussian blur feature #108

test/bench/perf.js

@@ -187,6 +187,30 @@ async.series({
           }
         });
       }
+    }).add('sharp-blur-mild', {
+      defer: true,
+      fn: function(deferred) {
+        sharp(inputJpgBuffer).resize(width, height).blur().toBuffer(function(err, buffer) {
+          if (err) {
+            throw err;
+          } else {
+            assert.notStrictEqual(null, buffer);
+            deferred.resolve();
+          }
+        });
+      }
+    }).add('sharp-blur-radius', {
+      defer: true,
+      fn: function(deferred) {
+        sharp(inputJpgBuffer).resize(width, height).blur(3).toBuffer(function(err, buffer) {
+          if (err) {
+            throw err;
+          } else {
+            assert.notStrictEqual(null, buffer);
+            deferred.resolve();
+          }
+        });
+      }
     }).add('sharp-nearest-neighbour', {
       defer: true,
       fn: function(deferred) {

test/unit/blur.js

@@ -0,0 +1,72 @@
+'use strict';
+
+var assert = require('assert');
+
+var sharp = require('../../index');
+var fixtures = require('../fixtures');
+
+describe('Blur', function() {
+
+  it('specific radius', function(done) {
+    sharp(fixtures.inputJpg)
+      .resize(320, 240)
+      .blur(1)
+      .toFile(fixtures.path('output.blur-1.jpg'), function(err, info) {
+        if (err) throw err;
+        assert.strictEqual('jpeg', info.format);
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        done();
+      });
+  });
+
+  it('mild blur', function(done) {
+    sharp(fixtures.inputJpg)
+      .resize(320, 240)
+      .blur()
+      .toFile(fixtures.path('output.blur-mild.jpg'), function(err, info) {
+        if (err) throw err;
+        assert.strictEqual('jpeg', info.format);
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        done();
+      });
+  });
+
+  it('invalid radius', function(done) {
+    var isValid = true;
+    try {
+      sharp(fixtures.inputJpg).blur(1.5);
+    } catch (err) {
+      isValid = false;
+    }
+    assert.strictEqual(false, isValid);
+    done();
+  });
+
+  it('blurred image is smaller than non-blurred', function(done) {
+    sharp(fixtures.inputJpg)
+      .resize(320, 240)
+      .blur(false)
+      .toBuffer(function(err, notBlurred, info) {
+        if (err) throw err;
+        assert.strictEqual(true, notBlurred.length > 0);
+        assert.strictEqual('jpeg', info.format);
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        sharp(fixtures.inputJpg)
+          .resize(320, 240)
+          .blur(true)
+          .toBuffer(function(err, blurred, info) {
+            if (err) throw err;
+            assert.strictEqual(true, blurred.length > 0);
+            assert.strictEqual(true, blurred.length < notBlurred.length);
+            assert.strictEqual('jpeg', info.format);
+            assert.strictEqual(320, info.width);
+            assert.strictEqual(240, info.height);
+            done();
+          });
+      });
+  });
+
+});