Add support for PNG format. Close #2.

tests/perf.js

@@ -2,63 +2,120 @@ var sharp = require("../index");
 var imagemagick = require("imagemagick");
 var gm = require("gm");
 var epeg = require("epeg");
+var async = require("async");
 var assert = require("assert");
 var Benchmark = require("benchmark");
 
-var input = __dirname + "/2569067123_aca715a2ee_o.jpg"; // http://www.flickr.com/photos/grizdave/2569067123/
-var output = __dirname + "/output.jpg";
+var inputJpg = __dirname + "/2569067123_aca715a2ee_o.jpg"; // http://www.flickr.com/photos/grizdave/2569067123/
+var outputJpg = __dirname + "/output.jpg";
+
+var inputPng = __dirname + "/50020484-00001.png"; // http://c.searspartsdirect.com/lis_png/PLDM/50020484-00001.png
+var outputPng = __dirname + "/output.png";
+
 var width = 640;
 var height = 480;
 
-var suite = new Benchmark.Suite;
-suite.add("imagemagick", {
-  "defer": true,
-  "fn": function(deferred) {
-    imagemagick.resize({
-      srcPath: input,
-      dstPath: output,
-      quality: 0.75,
-      width: width,
-      height: height
-    }, function(err) {
-      if (err) {
-        throw err;
-      } else {
+async.series({
+  jpeg: function(callback) {
+    (new Benchmark.Suite("jpeg")).add("imagemagick", {
+      "defer": true,
+      "fn": function(deferred) {
+        imagemagick.resize({
+          srcPath: inputJpg,
+          dstPath: outputJpg,
+          quality: 0.8,
+          width: width,
+          height: height
+        }, function(err) {
+          if (err) {
+            throw err;
+          } else {
+            deferred.resolve();
+          }
+        });
+      }
+    }).add("gm", {
+      "defer": true,
+      "fn": function(deferred) {
+        gm(inputJpg).crop(width, height).quality(80).write(outputJpg, function (err) {
+          if (err) {
+            throw err;
+          } else {
+            deferred.resolve();
+          }
+        });
+      }
+    }).add("epeg", {
+      "defer": true,
+      "fn": function(deferred) {
+        var image = new epeg.Image({path: inputJpg});
+        image.downsize(width, height, 80).saveTo(outputJpg);
         deferred.resolve();
       }
-    });
-  }
-}).add("gm", {
-  "defer": true,
-  "fn": function(deferred) {
-    gm(input).crop(width, height).write(output, function (err) {
-      if (err) {
-        throw err;
-      } else {
-        deferred.resolve();
+    }).add("sharp", {
+      "defer": true,
+      "fn": function(deferred) {
+        sharp.crop(inputJpg, outputJpg, width, height, function(err) {
+          if (err) {
+            throw err;
+          } else {
+            deferred.resolve();
+          }
+        });
       }
-    });
-  }
-}).add("epeg", {
-  "defer": true,
-  "fn": function(deferred) {
-    var image = new epeg.Image({path: input});
-    image.downsize(width, height).saveTo(output);
-    deferred.resolve();
-  }
-}).add("sharp", {
-  "defer": true,
-  "fn": function(deferred) {
-    sharp.crop(input, output, width, height, function(err) {
-      if (err) {
-        throw err;
-      } else {
-        deferred.resolve();
+    }).on("cycle", function(event) {
+      console.log("jpeg " + String(event.target));
+    }).on("complete", function() {
+      callback(null, this.filter("fastest").pluck("name"));
+    }).run();
+  },
+  png: function(callback) {
+    (new Benchmark.Suite("png")).add("imagemagick", {
+      "defer": true,
+      "fn": function(deferred) {
+        imagemagick.resize({
+          srcPath: inputPng,
+          dstPath: outputPng,
+          width: width,
+          height: height
+        }, function(err) {
+          if (err) {
+            throw err;
+          } else {
+            deferred.resolve();
+          }
+        });
       }
-    });
+    }).add("gm", {
+      "defer": true,
+      "fn": function(deferred) {
+        gm(inputPng).crop(width, height).write(outputPng, function (err) {
+          if (err) {
+            throw err;
+          } else {
+            deferred.resolve();
+          }
+        });
+      }
+    }).add("sharp", {
+      "defer": true,
+      "fn": function(deferred) {
+        sharp.crop(inputPng, outputPng, width, height, function(err) {
+          if (err) {
+            throw err;
+          } else {
+            deferred.resolve();
+          }
+        });
+      }
+    }).on("cycle", function(event) {
+      console.log(" png " + String(event.target));
+    }).on("complete", function() {
+      callback(null, this.filter("fastest").pluck("name"));
+    }).run();
   }
-}).on("cycle", function(event) {
-  console.log(String(event.target));
-}).on("complete", function() {
-  assert(this.filter("fastest").pluck("name") == "sharp");
-}).run();
+}, function(err, results) {
+  results.forEach(function(format, fastest) {
+    assert(fastest === "sharp", "sharp was slower than " + fastest + " for " + format);
+  });
+});