[PathKit] Add asm.js build and test jobs

Consolidates the karma files into one for docker/asmjs/wasm and all
combinations.

The asm.js build seems to have some small imprecisions that we didn't
see as much as with WASM, probably due to JS limitations/differences
to c++'s floats.

To address these, I've marked some (5) tests in PathOps* as flaky
because they fail on Release, Debug or Test versions of the asm.js build.

Other then that, asm.js seems basically identical to the WASM.

WASM is much smaller, 416k vs 877k and seems to load faster (not
measured).

Note to reviewers:
example.html was copied from npm-wasm version, so doesn't need
further review.

Bug: skia:8216
Change-Id: Ib92b90fa6c598de85a0be319d46b25693ae5aaa4
Reviewed-on: https://skia-review.googlesource.com/148396
Reviewed-by: Stephan Altmueller <stephana@google.com>

14 files changed, 725 insertions, 109 deletions

diff --git a/experimental/pathkit/Makefile b/experimental/pathkit/Makefile
index d66dbb121e..f0e7f45de1 100644
--- a/experimental/pathkit/Makefile
+++ b/experimental/pathkit/Makefile
@@ -1,39 +1,33 @@
 build:
 	./compile.sh
 
-npm:
+npm: npm-test npm-debug
 	mkdir -p ./npm-wasm/bin
 	mkdir -p ./npm-asmjs/bin
 	./compile.sh
-	cp ../../out/pathkit/pathkit.js ./npm-wasm/bin
+	cp ../../out/pathkit/pathkit.js   ./npm-wasm/bin
 	cp ../../out/pathkit/pathkit.wasm ./npm-wasm/bin
-
-	mkdir -p ./npm-wasm/bin/test
-	mkdir -p ./npm-asmjs/bin/test
-	./compile.sh test
-	cp ../../out/pathkit/pathkit.js ./npm-wasm/bin/test/pathkit.js
-	cp ../../out/pathkit/pathkit.wasm ./npm-wasm/bin/test/pathkit.wasm
-
-	mkdir -p ./npm-wasm/bin/debug
-	mkdir -p ./npm-asmjs/bin/debug
-	./compile.sh debug
-	cp ../../out/pathkit/pathkit.js ./npm-wasm/bin/debug/pathkit.js
-	cp ../../out/pathkit/pathkit.wasm ./npm-wasm/bin/debug/pathkit.wasm
-	#./compile.sh asm.js TODO
+	./compile.sh asm.js
+	cp ../../out/pathkit/pathkit.js     ./npm-asmjs/bin/pathkit.js
+	cp ../../out/pathkit/pathkit.js.mem ./npm-asmjs/bin/pathkit.js.mem
 
 publish:
 	cd npm-wasm; npm publish
+	cd ../npm-asmjs; npm publish
 
 update-major:
 	cd npm-wasm; npm version major
+	cd ../npm-asmjs; npm version major
 	echo "Don't forget to publish."
 
 update-minor:
 	cd npm-wasm; npm version minor
+	cd ../npm-asmjs; npm version minor
 	echo "Don't forget to publish."
 
 update-patch:
 	cd npm-wasm; npm version patch
+	cd ../npm-asmjs; npm version patch
 	echo "Don't forget to publish."
 
 # Build the library and run the tests. If developing locally, test-continuous is better
@@ -42,23 +36,36 @@ update-patch:
 test: npm-test
 	npm install
 	npx karma start ./karma.conf.js --single-run
+	ASM_JS=1 npx karma start ./karma.conf.js --single-run
 
 test-continuous:
 	echo "Assuming npm install has been run by user"
 	echo "Also assuming make npm-test has also been run by a user (if needed)"
 	npx karma start ./karma.conf.js --no-single-run --watch-poll
 
+test-continuous-asmjs:
+	echo "Assuming npm install has been run by user"
+	echo "Also assuming make npm-test has also been run by a user (if needed)"
+	ASM_JS=1 npx karma start ./karma.conf.js --no-single-run --watch-poll
+
 # Build the library and run the tests using the docker image.  If developing locally,
 # test-docker-continuous is better, although if you make changes to the C++/WASM code,
 # you will need to manually call make npm-test to re-build.
 test-docker: npm-test
-	docker run --shm-size=2gb -v $$SKIA_ROOT:/SRC gcr.io/skia-public/karma-chrome-tests:68.0.3440.106_v3 \
-karma start /SRC/experimental/pathkit/karma-docker.conf.js --single-run
+	docker run --shm-size=2gb -v $$SKIA_ROOT:/SRC gcr.io/skia-public/karma-chrome-tests:68.0.3440.106_v4 \
+karma start /SRC/experimental/pathkit/karma.conf.js --single-run
+	docker run --shm-size=2gb -v $$SKIA_ROOT:/SRC -e ASM_JS=1 gcr.io/skia-public/karma-chrome-tests:68.0.3440.106_v4 \
+karma start /SRC/experimental/pathkit/karma.conf.js --single-run
 
 test-docker-continuous:
 	echo "Assuming make npm-test has also been run by a user (if needed)"
-	docker run --shm-size=2gb -v $$SKIA_ROOT:/SRC gcr.io/skia-public/karma-chrome-tests:68.0.3440.106_v3 \
-karma start /SRC/experimental/pathkit/karma-docker.conf.js --no-single-run
+	docker run --shm-size=2gb -v $$SKIA_ROOT:/SRC gcr.io/skia-public/karma-chrome-tests:68.0.3440.106_v4 \
+karma start /SRC/experimental/pathkit/karma.conf.js --no-single-run
+
+test-docker-continuous-asmjs:
+	echo "Assuming make npm-test has also been run by a user (if needed)"
+	docker run --shm-size=2gb -v $$SKIA_ROOT:/SRC -e ASM_JS=1 gcr.io/skia-public/karma-chrome-tests:68.0.3440.106_v4 \
+karma start /SRC/experimental/pathkit/karma.conf.js --no-single-run
 
 npm-test:
 	# This compile time is typically faster than release and good for use with
@@ -66,8 +73,11 @@ npm-test:
 	mkdir -p ./npm-wasm/bin/test
 	mkdir -p ./npm-asmjs/bin/test
 	./compile.sh test
-	cp ../../out/pathkit/pathkit.js ./npm-wasm/bin/test/pathkit.js
+	cp ../../out/pathkit/pathkit.js   ./npm-wasm/bin/test/pathkit.js
 	cp ../../out/pathkit/pathkit.wasm ./npm-wasm/bin/test/pathkit.wasm
+	./compile.sh asm.js test
+	cp ../../out/pathkit/pathkit.js     ./npm-asmjs/bin/test/pathkit.js
+	cp ../../out/pathkit/pathkit.js.mem ./npm-asmjs/bin/test/pathkit.js.mem
 
 npm-debug:
 	# This compile time is typically faster than release and good for use with
@@ -75,8 +85,12 @@ npm-debug:
 	mkdir -p ./npm-wasm/bin/debug
 	mkdir -p ./npm-asmjs/bin/debug
 	./compile.sh debug
-	cp ../../out/pathkit/pathkit.js ./npm-wasm/bin/debug/pathkit.js
-	cp ../../out/pathkit/pathkit.wasm ./npm-wasm/bin/debug/pathkit.wasm
+	cp ../../out/pathkit/pathkit.js     ./npm-wasm/bin/debug/pathkit.js
+	cp ../../out/pathkit/pathkit.wasm   ./npm-wasm/bin/debug/pathkit.wasm
+	cp ../../out/pathkit/pathkit.js.map ./npm-wasm/bin/debug/pathkit.js.map
+	./compile.sh asm.js debug
+	cp ../../out/pathkit/pathkit.js     ./npm-asmjs/bin/debug/pathkit.js
+	cp ../../out/pathkit/pathkit.js.map ./npm-asmjs/bin/debug/pathkit.js.map
 
 example:
 	npm install experimental-pathkit-wasm
@@ -85,21 +99,32 @@ example:
 
 local-example:
 	rm -rf node_modules/experimental-pathkit-wasm
+	rm -rf node_modules/experimental-pathkit-asmjs
 	mkdir -p node_modules
-	ln -s -T ../npm-wasm node_modules/experimental-pathkit-wasm
-	echo "Go check out localhost:8000/npm-wasm/example.html"
+	ln -s -T ../npm-wasm  node_modules/experimental-pathkit-wasm
+	ln -s -T ../npm-asmjs node_modules/experimental-pathkit-asmjs
+	echo "Go check out http://localhost:8000/npm-wasm/example.html"
+	echo "or http://localhost:8000/npm-asmjs/example.html"
 	python serve.py
 
 local-example-test:
 	rm -rf node_modules/experimental-pathkit-wasm
+	rm -rf node_modules/experimental-pathkit-asmjs
 	mkdir -p node_modules/experimental-pathkit-wasm
+	mkdir -p node_modules/experimental-pathkit-asmjs
 	ln -s -T ../../npm-wasm/bin/test node_modules/experimental-pathkit-wasm/bin
+	ln -s -T ../../npm-asmjs/bin/test node_modules/experimental-pathkit-asmjs/bin
 	echo "Go check out localhost:8000/npm-wasm/example.html"
+	echo "or http://localhost:8000/npm-asmjs/example.html"
 	python serve.py
 
 local-example-debug:
 	rm -rf node_modules/experimental-pathkit-wasm
+	rm -rf node_modules/experimental-pathkit-asmjs
 	mkdir -p node_modules/experimental-pathkit-wasm
+	mkdir -p node_modules/experimental-pathkit-asmjs
 	ln -s -T ../../npm-wasm/bin/debug node_modules/experimental-pathkit-wasm/bin
+	ln -s -T ../../npm-asmjs/bin/debug node_modules/experimental-pathkit-asmjs/bin
 	echo "Go check out localhost:8000/npm-wasm/example.html"
+	echo "or http://localhost:8000/npm-asmjs/example.html"
 	python serve.py
\ No newline at end of file
diff --git a/experimental/pathkit/compile.sh b/experimental/pathkit/compile.sh
index 9507f809bf..22b8a49b0a 100755
--- a/experimental/pathkit/compile.sh
+++ b/experimental/pathkit/compile.sh
@@ -44,7 +44,7 @@ fi
 # Use -O0 for larger builds (but generally quicker)
 # Use -Oz for (much slower, but smaller/faster) production builds
 export EMCC_CLOSURE_ARGS="--externs $BASE_DIR/externs.js "
-RELEASE_CONF="-Oz --closure 1 -s EVAL_CTORS=1 --llvm-lto 3"
+RELEASE_CONF="-Oz --closure 1 -s EVAL_CTORS=1 --llvm-lto 3 -s ELIMINATE_DUPLICATE_FUNCTIONS=1"
 if [[ $@ == *test* ]]; then
   echo "Building a Testing/Profiling build"
   RELEASE_CONF="-O2 --profiling -DPATHKIT_TESTING -DSK_RELEASE"
@@ -52,13 +52,13 @@ elif [[ $@ == *debug* ]]; then
   echo "Building a Debug build"
   # -g4 creates source maps that can apparently let you see the C++ code
   # in the browser's debugger.
-  RELEASE_CONF="-O0 -s SAFE_HEAP=1 -s ASSERTIONS=1 -s DEMANGLE_SUPPORT=1 -g4 -DPATHKIT_TESTING -DSK_DEBUG"
+  RELEASE_CONF="-O0 --js-opts 0 -s SAFE_HEAP=1 -s ASSERTIONS=1 -g4 -DPATHKIT_TESTING -DSK_DEBUG"
 fi
 
 WASM_CONF="-s WASM=1"
 if [[ $@ == *asm.js* ]]; then
   echo "Building with asm.js instead of WASM"
-  WASM_CONF="-s WASM=0 -s ALLOW_MEMORY_GROWTH=1 --separate-asm -s ELIMINATE_DUPLICATE_FUNCTIONS=1"
+  WASM_CONF="-s WASM=0 -s ALLOW_MEMORY_GROWTH=1"
 fi
 
 OUTPUT="-o $BUILD_DIR/pathkit.js"
diff --git a/experimental/pathkit/karma-docker.conf.js b/experimental/pathkit/karma-docker.conf.js
deleted file mode 100644
index 3e691541a8..0000000000
--- a/experimental/pathkit/karma-docker.conf.js
+++ /dev/null
@@ -1,65 +0,0 @@
-module.exports = function(config) {
-  config.set({
-
-    // frameworks to use
-    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-    frameworks: ['jasmine'],
-
-
-    // list of files / patterns to load in the browser
-    files: [
-      { pattern: 'npm-wasm/bin/test/pathkit.wasm', included:false, served:true},
-      { pattern: 'tests/*.json', included:false, served:true},
-      'tests/testReporter.js',
-      'npm-wasm/bin/test/pathkit.js',
-      'tests/*.spec.js'
-    ],
-
-    proxies: {
-      "/pathkit/": "/base/npm-wasm/bin/test/"
-    },
-
-    // test results reporter to use
-    // possible values: 'dots', 'progress'
-    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
-    reporters: ['progress'],
-
-    // web server port
-    port: 4444,
-
-    // enable / disable colors in the output (reporters and logs)
-    colors: true,
-
-    // level of logging
-    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
-    logLevel: config.LOG_INFO,
-
-    // enable / disable watching file and executing tests whenever any file changes
-    autoWatch: true,
-
-    browserDisconnectTimeout: 15000,
-    browserNoActivityTimeout: 15000,
-
-    // start these browsers
-    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-    browsers: ['ChromeHeadlessNoSandbox'],
-    customLaunchers: {
-        ChromeHeadlessNoSandbox: {
-            base: 'ChromeHeadless',
-            flags: [
-            // Without this flag, we see an error:
-            // Failed to move to new namespace: PID namespaces supported, Network namespace supported, but failed: errno = Operation not permitted
-                '--no-sandbox'
-            ]
-        }
-    },
-
-    // Continuous Integration mode
-    // if true, Karma captures browsers, runs the tests and exits
-    singleRun: false,
-
-    // Concurrency level
-    // how many browser should be started simultaneous
-    concurrency: Infinity,
-  })
-}
diff --git a/experimental/pathkit/karma.conf.js b/experimental/pathkit/karma.conf.js
index ad4243214e..faa870ef8e 100644
--- a/experimental/pathkit/karma.conf.js
+++ b/experimental/pathkit/karma.conf.js
@@ -1,11 +1,13 @@
-module.exports = function(config) {
-  config.set({
+const isDocker = require('is-docker')();
 
+module.exports = function(config) {
+  // Set the default values to be what are needed when testing the
+  // WebAssembly build locally.
+  let cfg = {
     // frameworks to use
     // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
     frameworks: ['jasmine'],
 
-
     // list of files / patterns to load in the browser
     files: [
       { pattern: 'npm-wasm/bin/test/pathkit.wasm', included:false, served:true},
@@ -50,5 +52,39 @@ module.exports = function(config) {
     // Concurrency level
     // how many browser should be started simultaneous
     concurrency: Infinity,
-  })
+  };
+
+  if (isDocker) {
+    // See https://hackernoon.com/running-karma-tests-with-headless-chrome-inside-docker-ae4aceb06ed3
+    cfg.browsers = ['ChromeHeadlessNoSandbox'],
+    cfg.customLaunchers = {
+        ChromeHeadlessNoSandbox: {
+            base: 'ChromeHeadless',
+            flags: [
+            // Without this flag, we see an error:
+            // Failed to move to new namespace: PID namespaces supported, Network namespace supported, but failed: errno = Operation not permitted
+                '--no-sandbox'
+            ],
+        },
+    };
+  }
+
+  if (process.env.ASM_JS) {
+    console.log('asm.js is under test');
+    cfg.files = [
+      { pattern: 'npm-asmjs/bin/test/pathkit.js.mem', included:false, served:true},
+      { pattern: 'tests/*.json', included:false, served:true},
+      'tests/testReporter.js',
+      'npm-asmjs/bin/test/pathkit.js',
+      'tests/*.spec.js'
+    ];
+
+    cfg.proxies = {
+      "/pathkit/": "/base/npm-asmjs/bin/test/"
+    };
+  } else {
+    console.log('wasm is under test');
+  }
+
+  config.set(cfg);
 }
diff --git a/experimental/pathkit/npm-asmjs/LICENSE b/experimental/pathkit/npm-asmjs/LICENSE
new file mode 100644
index 0000000000..7a4a3ea242
--- /dev/null
+++ b/experimental/pathkit/npm-asmjs/LICENSE
@@ -0,0 +1,202 @@
+
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\ No newline at end of file
diff --git a/experimental/pathkit/npm-asmjs/README.md b/experimental/pathkit/npm-asmjs/README.md
new file mode 100644
index 0000000000..5db209603e
--- /dev/null
+++ b/experimental/pathkit/npm-asmjs/README.md
@@ -0,0 +1,56 @@
+An asm.js version of Skia's PathOps toolkit.
+
+To use the library, run `npm install experimental-pathkit-asmjs` and then simply include it:
+
+    <script src="/node_modules/experimental-pathkit-asmjs/bin/pathkit.js"></script>
+    PathKitInit({
+        locateFile: (file) => '/node_modules/experimental-pathkit-asmjs/bin/'+file,
+    }).then((PathKit) => {
+        // Code goes here using PathKit
+    });
+
+PathKit comes in two parts, a JS loader and the actual WASM code. The JS loader creates
+a global `PathKitInit` that can be called to load the WASM code. The `locateFile` function
+is used to tell the JS loader where to find the .js.mem file. By default, it will
+look for /pathkit.js.mem, so if this is not the case, use `locateFile` to configure
+this properly.
+The `PathKit` object returned through the .then() callback is fully loaded and ready to use.
+
+See the [API page](https://skia.org/user/modules/pathkit) and
+[example.html](https://github.com/google/skia/blob/master/experimental/pathkit/npm-asmjs/example.html)
+for details on how to use the library.
+
+Using PathKit and WebPack
+-------------------------
+
+WebPack's support for asm.js should be straight-forward, since it's just another JS library. PathKit can be
+used with just a few configuration changes.
+
+In the JS code, use require():
+
+    const PathKitInit = require('experimental-pathkit-asmjs/bin/pathkit.js')
+    PathKitInit().then((PathKit) => {
+        // Code goes here using PathKit
+    })
+
+Since WebPack does not expose the entire `/node_modules/` directory, but instead
+packages only the needed pieces, we have to copy pathkit.mem into the build directory.
+One such solution is to use [CopyWebpackPlugin](https://github.com/webpack-contrib/copy-webpack-plugin).
+For example, add the following plugin:
+
+    config.plugins.push(
+        new CopyWebpackPlugin([
+            { from: 'node_modules/experimental-pathkit-asmjs/bin/pathkit.js.mem' }
+        ])
+    );
+
+If webpack gives an error similar to:
+
+    ERROR in ./node_modules/experimental-pathkit-asmjs/bin/pathkit.js
+    Module not found: Error: Can't resolve 'fs' in '...'
+
+Then, add the following configuration change to the node section of the config:
+
+    config.node = {
+        fs: 'empty'
+    };
diff --git a/experimental/pathkit/npm-asmjs/example.html b/experimental/pathkit/npm-asmjs/example.html
new file mode 100644
index 0000000000..3479b83b4f
--- /dev/null
+++ b/experimental/pathkit/npm-asmjs/example.html
@@ -0,0 +1,321 @@
+<!DOCTYPE html>
+<title>PathKit (Skia + asm.js)</title>
+<meta charset="utf-8" />
+<meta http-equiv="X-UA-Compatible" content="IE=edge">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+<style>
+  svg, canvas {
+    border: 1px dashed #AAA;
+  }
+
+  canvas {
+    width: 200px;
+    height: 200px;
+  }
+
+  canvas.big {
+    width: 300px;
+    height: 300px;
+  }
+
+</style>
+
+<h2> Can output to an SVG Path, a Canvas, or a Path2D object </h2>
+<svg id=svg1 xmlns='http://www.w3.org/2000/svg' width=200 height=200></svg>
+<canvas id=canvas1></canvas>
+<canvas id=canvas2></canvas>
+
+<h2> Interact with NewPath() just like a Path2D Object </h2>
+<canvas class=big id=canvas3></canvas>
+<canvas class=big id=canvas4></canvas>
+
+<h2> Has various Path Effects </h2>
+<canvas class=big id=canvas5></canvas>
+<canvas class=big id=canvas6></canvas>
+<canvas class=big id=canvas7></canvas>
+<canvas class=big id=canvas8></canvas>
+<canvas class=big id=canvas9></canvas>
+<canvas class=big id=canvas10></canvas>
+<canvas class=big id=canvasTransform></canvas>
+
+<h2> Supports fill-rules of nonzero and evenodd </h2>
+<svg id=svg2 xmlns='http://www.w3.org/2000/svg' width=200 height=200></svg>
+<svg id=svg3 xmlns='http://www.w3.org/2000/svg' width=200 height=200></svg>
+
+<script type="text/javascript" src="/node_modules/experimental-pathkit-asmjs/bin/pathkit.js"></script>
+
+<script type="text/javascript" charset="utf-8">
+
+  PathKitInit({
+    locateFile: (file) => '/node_modules/experimental-pathkit-asmjs/bin/'+file,
+  }).then((PathKit) => {
+    window.PathKit = PathKit;
+    OutputsExample(PathKit);
+    Path2DExample(PathKit);
+    PathEffectsExample(PathKit);
+    MatrixTransformExample(PathKit);
+    FilledSVGExample(PathKit);
+  });
+
+  function setCanvasSize(ctx, width, height) {
+    ctx.canvas.width = width;
+    ctx.canvas.height = height;
+  }
+
+  function OutputsExample(PathKit) {
+    let firstPath = PathKit.FromSVGString('M11.99 2C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8zm.5-13H11v6l5.25 3.15.75-1.23-4.5-2.67z');
+
+    let secondPath = PathKit.NewPath();
+    // Acts somewhat like the Canvas API, except can be chained
+    secondPath.moveTo(1, 1)
+              .lineTo(20, 1)
+              .lineTo(10, 30)
+              .closePath();
+
+    // Join the two paths together (mutating firstPath in the process)
+    firstPath.op(secondPath, PathKit.PathOp.INTERSECT);
+
+    let simpleStr = firstPath.toSVGString();
+
+    let newSVG = document.createElementNS('http://www.w3.org/2000/svg', 'path');
+    newSVG.setAttribute('stroke', 'rgb(0,0,200)');
+    newSVG.setAttribute('fill', 'white');
+    newSVG.setAttribute('transform', 'scale(8,8)');
+    newSVG.setAttribute('d', simpleStr);
+    document.getElementById('svg1').appendChild(newSVG);
+
+    // Draw directly to Canvas
+    let ctx = document.getElementById('canvas1').getContext('2d');
+    setCanvasSize(ctx, 200, 200);
+    ctx.strokeStyle = 'green';
+    ctx.fillStyle = 'white';
+    ctx.scale(8, 8);
+    ctx.beginPath();
+    firstPath.toCanvas(ctx);
+    ctx.stroke();
+
+    // create Path2D object and use it in a Canvas.
+    let path2D = firstPath.toPath2D();
+    ctx = document.getElementById('canvas2').getContext('2d');
+    setCanvasSize(ctx, 200, 200);
+    ctx.canvas.width = 200
+    ctx.scale(8, 8);
+    ctx.fillStyle = 'purple';
+    ctx.strokeStyle = 'orange';
+    ctx.fill(path2D);
+    ctx.stroke(path2D);
+
+    // clean up memory and call destructors in the c++ code (if any).
+    // See http://kripken.github.io/emscripten-site/docs/porting/connecting_cpp_and_javascript/embind.html?highlight=memory#memory-management
+    firstPath.delete();
+    secondPath.delete();
+  }
+
+  function Path2DExample(PathKit) {
+    let objs = [new Path2D(), PathKit.NewPath(), new Path2D(), PathKit.NewPath()];
+    let canvases = [
+      document.getElementById('canvas3').getContext('2d'),
+      document.getElementById('canvas4').getContext('2d')
+    ];
+
+    for (i = 0; i <= 1; i++) {
+      let path = objs[i];
+
+      path.moveTo(20, 5);
+      path.lineTo(30, 20);
+      path.lineTo(40, 10);
+      path.lineTo(50, 20);
+      path.lineTo(60, 0);
+      path.lineTo(20, 5);
+
+      path.moveTo(20, 80);
+      path.bezierCurveTo(90, 10, 160, 150, 190, 10);
+
+      path.moveTo(36, 148);
+      path.quadraticCurveTo(66, 188, 120, 136);
+      path.lineTo(36, 148);
+
+      path.rect(5, 170, 20, 20);
+
+      path.moveTo(150, 180);
+      path.arcTo(150, 100, 50, 200, 20);
+      path.lineTo(160, 160);
+
+      path.moveTo(20, 120);
+      path.arc(20, 120, 18, 0, 1.75 * Math.PI);
+      path.lineTo(20, 120);
+
+      let secondPath = objs[i+2];
+      secondPath.ellipse(130, 25, 30, 10, -1*Math.PI/8, Math.PI/6, 1.5*Math.PI, false);
+
+      path.addPath(secondPath);
+
+      let m = document.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGMatrix();
+      m.a = 1; m.b = 0;
+      m.c = 0; m.d = 1;
+      m.e = 0; m.f = 20.5;
+
+      path.addPath(secondPath, m);
+      // With PathKit, one can also just provide the 6 params as floats, to avoid
+      // the overhead of making an SVGMatrix
+      // path.addPath(secondPath, 1, 0, 0, 1, 0, 20.5);
+
+      canvasCtx = canvases[i];
+      canvasCtx.fillStyle = 'blue';
+      setCanvasSize(canvasCtx, 300, 300);
+      canvasCtx.scale(1.5, 1.5);
+      if (path.toPath2D) {
+        canvasCtx.stroke(path.toPath2D());
+      } else {
+        canvasCtx.stroke(path);
+      }
+    }
+
+
+    objs[1].delete();
+  }
+
+  // see https://fiddle.skia.org/c/@discrete_path
+  function drawStar(path) {
+    let R = 115.2, C = 128.0;
+    path.moveTo(C + R + 22, C);
+    for (let i = 1; i < 8; i++) {
+      let a = 2.6927937 * i;
+      path.lineTo(C + R * Math.cos(a) + 22, C + R * Math.sin(a));
+    }
+    path.closePath();
+    return path;
+  }
+
+  function PathEffectsExample(PathKit) {
+    let effects = [
+      // no-op
+      (path) => path,
+      // dash
+      (path) => path.dash(10, 3, 0),
+      // trim (takes optional 3rd param for returning the trimmed part
+      // or the complement)
+      (path) => path.trim(0.25, 0.8, false),
+      // simplify
+      (path) => path.simplify(),
+      // stroke
+      (path) => path.stroke({
+        width: 15,
+        join: PathKit.StrokeJoin.BEVEL,
+        cap: PathKit.StrokeCap.BUTT,
+        miter_limit: 1,
+      }),
+      // "offset effect", that is, making a border around the shape.
+      (path) => {
+        let orig = path.copy();
+        path.stroke({
+          width: 10,
+          join: PathKit.StrokeJoin.ROUND,
+          cap: PathKit.StrokeCap.SQUARE,
+        })
+          .op(orig, PathKit.PathOp.DIFFERENCE);
+        orig.delete();
+      }
+    ];
+
+    let names = ["(plain)", "Dash", "Trim", "Simplify", "Stroke", "Offset"];
+
+    for (let i = 0; i < effects.length; i++) {
+      let path = PathKit.NewPath();
+      drawStar(path);
+
+      // The transforms apply directly to the path.
+      effects[i](path);
+
+      let ctx = document.getElementById(`canvas${i+5}`).getContext('2d');
+      setCanvasSize(ctx, 300, 300);
+      ctx.strokeStyle = '#3c597a';
+      ctx.fillStyle = '#3c597a';
+      if (i === 4 || i === 5) {
+        ctx.fill(path.toPath2D(), path.getFillTypeString());
+      } else {
+        ctx.stroke(path.toPath2D());
+      }
+
+      ctx.font = '42px monospace';
+
+      let x = 150-ctx.measureText(names[i]).width/2;
+      ctx.strokeText(names[i], x, 290);
+
+      path.delete();
+    }
+  }
+
+  function MatrixTransformExample(PathKit) {
+    // Creates an animated star that twists and moves.
+    let ctx = document.getElementById('canvasTransform').getContext('2d');
+    setCanvasSize(ctx, 300, 300);
+    ctx.strokeStyle = '#3c597a';
+
+    let path = drawStar(PathKit.NewPath());
+    // TODO(kjlubick): Perhaps expose some matrix helper functions to allow
+    // clients to build their own matrices like this?
+    // These matrices represent a 2 degree rotation and a 1% scale factor.
+    let scaleUp = [1.0094, -0.0352,  3.1041,
+                   0.0352,  1.0094, -6.4885,
+                   0     ,  0      , 1];
+
+    let scaleDown = [ 0.9895, 0.0346, -2.8473,
+                     -0.0346, 0.9895,  6.5276,
+                      0     , 0     ,  1];
+
+    let i = 0;
+    function frame(){
+      i++;
+      if (Math.round(i/100) % 2) {
+        path.transform(scaleDown);
+      } else {
+        path.transform(scaleUp);
+      }
+
+      ctx.clearRect(0, 0, 300, 300);
+      ctx.stroke(path.toPath2D());
+
+      ctx.font = '42px monospace';
+      let x = 150-ctx.measureText('Transform').width/2;
+      ctx.strokeText('Transform', x, 290);
+
+      window.requestAnimationFrame(frame);
+    }
+    window.requestAnimationFrame(frame);
+  }
+
+  function FilledSVGExample(PathKit) {
+    let innerRect = PathKit.NewPath();
+    innerRect.rect(80, 100, 40, 40);
+
+    let outerRect = PathKit.NewPath();
+    outerRect.rect(50, 10, 100, 100)
+             .op(innerRect, PathKit.PathOp.XOR);
+
+    let str = outerRect.toSVGString();
+
+    let diffSVG = document.createElementNS('http://www.w3.org/2000/svg', 'path');
+    diffSVG.setAttribute('stroke', 'red');
+    diffSVG.setAttribute('fill', 'black');
+    // force fill-rule to nonzero to demonstrate difference
+    diffSVG.setAttribute('fill-rule', 'nonzero');
+    diffSVG.setAttribute('d', str);
+    document.getElementById('svg2').appendChild(diffSVG);
+
+    let unionSVG = document.createElementNS('http://www.w3.org/2000/svg', 'path');
+    unionSVG.setAttribute('stroke', 'red');
+    unionSVG.setAttribute('fill', 'black');
+    // ask what the path thinks fill-rule should be ('evenodd')
+    // SVG and Canvas both use the same keys ('nonzero' and 'evenodd') and both
+    // default to 'nonzero', so one call supports both.
+    unionSVG.setAttribute('fill-rule', outerRect.getFillTypeString());
+    unionSVG.setAttribute('d', str);
+    document.getElementById('svg3').appendChild(unionSVG);
+
+    outerRect.delete();
+    innerRect.delete();
+  }
+
+</script>
diff --git a/experimental/pathkit/npm-asmjs/package.json b/experimental/pathkit/npm-asmjs/package.json
new file mode 100644
index 0000000000..b938696994
--- /dev/null
+++ b/experimental/pathkit/npm-asmjs/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "experimental-pathkit-asmjs",
+  "version": "0.2.0",
+  "description": "A asm.js version of Skia's PathOps toolkit",
+  "main": "bin/pathkit.js",
+  "homepage": "https://github.com/google/skia/tree/master/experimental/pathkit",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "license": "Apache-2.0"
+}
diff --git a/experimental/pathkit/npm-wasm/README.md b/experimental/pathkit/npm-wasm/README.md
index 1b6d105d61..8110781971 100644
--- a/experimental/pathkit/npm-wasm/README.md
+++ b/experimental/pathkit/npm-wasm/README.md
@@ -16,7 +16,9 @@ look for /pathkit.wasm, so if this is not the case, use `locateFile` to configur
 this properly.
 The `PathKit` object returned through the .then() callback is fully loaded and ready to use.
 
-See example.html for a fuller example of how to use the library.
+See the [API page](https://skia.org/user/modules/pathkit) and
+[example.html](https://github.com/google/skia/blob/master/experimental/pathkit/npm-wasm/example.html)
+for details on how to use the library.
 
 Using PathKit and WebPack
 -------------------------
diff --git a/experimental/pathkit/package.json b/experimental/pathkit/package.json
index 731afd4ef6..72796323b1 100644
--- a/experimental/pathkit/package.json
+++ b/experimental/pathkit/package.json
@@ -8,6 +8,7 @@
     "experimental-pathkit-wasm": "^0.2.0"
   },
   "devDependencies": {
+    "is-docker": "^1.1.0",
     "jasmine-core": "^3.1.0",
     "karma": "^2.0.5",
     "karma-chrome-launcher": "^2.2.0",
diff --git a/experimental/pathkit/tests/PathOpsOp.json b/experimental/pathkit/tests/PathOpsOp.json
index b46c2f185c..b5b2205026 100644
--- a/experimental/pathkit/tests/PathOpsOp.json
+++ b/experimental/pathkit/tests/PathOpsOp.json
@@ -7063,7 +7063,7 @@
   "fillType2": "kWinding_FillType",
   "op": "kUnion_SkPathOp",
   "expectSuccess": "yes",
-  "expectMatch": "yes",
+  "expectMatch": "flaky",
   "succeeded": true,
   "out": [[0, "0x40031739", "0x40018b9c"],
     [4, "0x401247d2", "0x4052d6b5", "0x401327df", "0x408993f0", "0x00000000", "0x40000000"],
diff --git a/experimental/pathkit/tests/PathOpsSimplify.json b/experimental/pathkit/tests/PathOpsSimplify.json
index 55ce8885e6..f134fb3f40 100644
--- a/experimental/pathkit/tests/PathOpsSimplify.json
+++ b/experimental/pathkit/tests/PathOpsSimplify.json
@@ -8621,7 +8621,7 @@
     [5]],
   "fillType": "kWinding_FillType",
   "expectSuccess": "yes",
-  "expectMatch": "yes",
+  "expectMatch": "flaky",
   "succeeded": true,
   "out": [[0, "0x40400000", "0x40400000"],
     [1, "0x00000000", "0x40400000"],
@@ -10111,7 +10111,7 @@
     [5]],
   "fillType": "kWinding_FillType",
   "expectSuccess": "yes",
-  "expectMatch": "yes",
+  "expectMatch": "flaky",
   "succeeded": true,
   "out": [[0, "0x00000000", "0x3f800000"],
     [1, "0x00000000", "0x00000000"],
@@ -10578,7 +10578,7 @@
     [5]],
   "fillType": "kWinding_FillType",
   "expectSuccess": "yes",
-  "expectMatch": "yes",
+  "expectMatch": "flaky",
   "succeeded": true,
   "out": [[0, "0x3f7f1d3c", "0x3e62c4a7"],
     [2, "0x3f70f0f1", "0x00000000", "0x00000000", "0x00000000"],
@@ -11103,7 +11103,7 @@
     [5]],
   "fillType": "kWinding_FillType",
   "expectSuccess": "yes",
-  "expectMatch": "yes",
+  "expectMatch": "flaky",
   "succeeded": true,
   "out": [[0, "0x3f800000", "0x00000000"],
     [1, "0x00000000", "0x00000000"],
diff --git a/experimental/pathkit/tests/path.spec.js b/experimental/pathkit/tests/path.spec.js
index 3c55dfac83..e77be6305f 100644
--- a/experimental/pathkit/tests/path.spec.js
+++ b/experimental/pathkit/tests/path.spec.js
@@ -90,6 +90,18 @@ describe('PathKit\'s Path Behavior', function() {
         });
     });
 
+    function ExpectRectsToBeEqual(actual, expected) {
+        if (PathKit.usingWasm) {
+            // exact match
+            expect(actual).toEqual(expected);
+        } else {
+            // floats get rounded a little bit
+            expect(actual.fLeft).toBeCloseTo(expected.fLeft, 4);
+            expect(actual.fTop).toBeCloseTo(expected.fTop, 4);
+            expect(actual.fRight).toBeCloseTo(expected.fRight, 4);
+            expect(actual.fBottom).toBeCloseTo(expected.fBottom, 4);
+        }
+    }
 
     function bits2float(str) {
         return PathKit.SkBits2FloatUnsigned(parseInt(str))
@@ -119,9 +131,10 @@ describe('PathKit\'s Path Behavior', function() {
                 path.moveTo(1, 1);
                 path.quadraticCurveTo(4, 3, 2, 2);
                 expect(path.getBounds()).toEqual(PathKit.MakeLTRBRect(1, 1, 4, 3));
-                expect(path.computeTightBounds()).toEqual(PathKit.MakeLTRBRect(1, 1,
-                            bits2float("0x40333334"),  // 2.8
-                            bits2float("0x40155556"))); // 2.3333333
+                ExpectRectsToBeEqual(path.computeTightBounds(),
+                                     PathKit.MakeLTRBRect(1, 1,
+                                        bits2float("0x40333334"),  // 2.8
+                                        bits2float("0x40155556"))); // 2.3333333
                 path.delete();
 
                 done();
@@ -129,6 +142,21 @@ describe('PathKit\'s Path Behavior', function() {
         });
     });
 
+    function ExpectCmdsToBeEqual(actual, expected) {
+        if (PathKit.usingWasm) {
+            // exact match
+            expect(actual).toEqual(expected);
+        } else {
+            // lossy match
+            actual.every((cmd, cmdIdx) => {
+                cmd.every((arg, argIdx) => {
+                    // The asm.js code is close to the wasm/c++ output, but not quite.
+                    expect(arg).toBeCloseTo(expected[cmdIdx][argIdx], 4)
+                });
+            });
+        }
+    }
+
     describe('Command arrays', function(){
         it('does NOT approximates conics when dumping as toCmds', function(done){
             LoadPathKit.then(() => {
@@ -146,8 +174,7 @@ describe('PathKit\'s Path Behavior', function() {
                     [PathKit.CONIC_VERB, bits2float("0x41dba58e"), 102, bits2float("0x4202e962"), bits2float("0x42d68b4d"), bits2float("0x3f6c8361")],  // 27.4558, 102, 32.7279, 107.272, 0.92388
                     [PathKit.LINE_VERB, 20, 120],
                 ];
-                let actual = path.toCmds();
-                expect(actual).toEqual(expectedCmds);
+                ExpectCmdsToBeEqual(path.toCmds(), expectedCmds);
 
                 path.delete();
                 done();
diff --git a/experimental/pathkit/tests/pathops.spec.js b/experimental/pathkit/tests/pathops.spec.js
index bec52524ff..39d879cf15 100644
--- a/experimental/pathkit/tests/pathops.spec.js
+++ b/experimental/pathkit/tests/pathops.spec.js
@@ -34,11 +34,11 @@ function addSVG(testName, expectedPath, actualPath, message) {
     <div>${message}</div>
 
     <svg class='expected' viewBox='${getViewBox(expectedPath)}'>
-        <path stroke=black d="${expectedPath.toSVGString()}"></path>
+        <path stroke=black fill=white stroke-width=0.01 d="${expectedPath.toSVGString()}"></path>
     </svg>
 
     <svg class='actual' viewBox='${getViewBox(actualPath)}'>
-        <path stroke=black d="${actualPath.toSVGString()}"></path>
+        <path stroke=black fill=white stroke-width=0.01 d="${actualPath.toSVGString()}"></path>
     </svg>
 `;
     container.appendChild(thisTest);