moar stuff

* Update package.json

* Update package.json

* Update README.md

* Update README.md

* Use cmake for libwebp

* Minimize libwebp

.babelrc

@@ -1,13 +0,0 @@
-{
-  "plugins": [
-    "transform-class-properties",
-    "transform-react-constant-elements",
-    "transform-react-remove-prop-types",
-    [
-      "transform-react-jsx",
-      {
-        "pragma": "h"
-      }
-    ]
-  ]
-}

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,36 @@
+---
+name: Bug report
+about: Something is not working as expected
+labels: 
+
+---
+
+**Before you start**
+Please take a look at the [FAQ](https://github.com/GoogleChromeLabs/squoosh/wiki/FAQ) as well as the already opened issues! If nothing fits your problem, go ahead and fill out the following template:
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Version:**
+ - OS w/ version: [e.g. iOS 12]
+ - Browser w/ version [e.g. Chrome 70]
+ - Node version: [e.g. 10.11.0]
+ - npm version: [e.g. 6.4.1]
+
+**Is your issue related to the quality of image compression?**
+Please attach original and output images (you can drag & drop to attach). 
+- Original image 
+- Output image from Squoosh
+
+**Additional context, screenshots, screencasts**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,18 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+labels: 
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Does other service/app have this feature?**
+Add any service you know/use that has this feature (We want to know for research)
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.travis.yml

@@ -1,5 +1,7 @@
 language: node_js
 node_js:
 - node
+- 10
+- 8
 cache: npm
-script: npm run build || npm run build # scss ts definitions need to be generated before an actual build
+script: npm run build

README.md

@@ -1,5 +1,31 @@
-# Squoosh!
+# [Squoosh]!
 
-Squoosh will be an image compression web app that allows you to dive into the
-advanced options provided by various image compressors.
+[Squoosh] is an image compression web app that allows you to dive into the advanced options provided
+by various image compressors.
 
+# Privacy
+
+Google Analytics is used to record the following:
+
+* [Basic visit data](https://support.google.com/analytics/answer/6004245?ref_topic=2919631).
+* Before and after image size once an image is downloaded. These values are rounded to the nearest
+  kilobyte.
+
+Image compression is handled locally; no additional data is sent to the server.
+
+# Building locally
+
+Clone the repo, and:
+
+```sh
+npm install
+npm run build
+```
+
+You can run the development server with:
+
+```sh
+npm start
+```
+
+[Squoosh]: https://squoosh.app

_headers.ejs

@@ -0,0 +1,18 @@
+# Long-term cache by default.
+/*
+  Cache-Control: max-age=31536000
+
+# And here are the exceptions:
+/
+  Cache-Control: no-cache
+
+/serviceworker.js
+  Cache-Control: no-cache
+
+/manifest.json
+  Cache-Control: must-revalidate, max-age=3600
+
+# URLs in /assets do not include a hash and are mutable.
+# But it isn't a big deal if the user gets an old version.
+/assets/*
+  Cache-Control: must-revalidate, max-age=3600

_redirects.ejs

@@ -0,0 +1,2 @@
+/index.html / 301
+/* /index.html 301

codecs/README.md

@@ -11,6 +11,6 @@ $ npm install
 $ npm run build
 ```
 
-This will build two files: `<codec name>_<enc or dec>.js` and `<codec name>_<enc or dec>.wasm`. It will most likely be necessary to set [`Module["locateFile"]`](https://kripken.github.io/emscripten-site/docs/api_reference/module.html#affecting-execution) to sucessfully load the `.wasm` file. When the `.js` file is loaded, a global `<codec name>_<enc or dec>` is created with the same API as an [Emscripten `Module`](https://kripken.github.io/emscripten-site/docs/api_reference/module.html).
+This will build two files: `<codec name>_<enc or dec>.js` and `<codec name>_<enc or dec>.wasm`. It will most likely be necessary to set [`Module["locateFile"]`](https://kripken.github.io/emscripten-site/docs/api_reference/module.html#affecting-execution) to successfully load the `.wasm` file. When the `.js` file is loaded, a global `<codec name>_<enc or dec>` is created with the same API as an [Emscripten `Module`](https://kripken.github.io/emscripten-site/docs/api_reference/module.html).
 
 Each codec will document its API in its README.

codecs/imagequant/package.json

@@ -8,6 +8,6 @@
     "libimagequant": "ImageOptim/libimagequant#2.12.1"
   },
   "devDependencies": {
-    "napa": "^3.0.0"
+    "napa": "3.0.0"
   }
 }

codecs/mozjpeg_enc/package.json

@@ -8,6 +8,6 @@
     "mozjpeg": "mozilla/mozjpeg#v3.3.1"
   },
   "devDependencies": {
-    "napa": "^3.0.0"
+    "napa": "3.0.0"
   }
 }

codecs/optipng/README.md

@@ -1,6 +1,6 @@
 # OptiPNG
 
-- Source: <https://sourceforge.net/project/optipng>
+- Source: <http://optipng.sourceforge.net/>
 - Version: v0.7.7
 
 ## Dependencies

codecs/optipng/package.json

@@ -16,7 +16,7 @@
     "zlib": "emscripten-ports/zlib"
   },
   "dependencies": {
-    "napa": "^3.0.0",
+    "napa": "3.0.0",
     "tar-dependency": "0.0.3"
   }
 }

codecs/oxipng/.gitignore

@@ -0,0 +1,5 @@
+/target
+**/*.rs.bk
+Cargo.lock
+bin/
+wasm-pack.log

codecs/oxipng/Cargo.toml

@@ -0,0 +1,36 @@
+[package]
+name = "test"
+version = "0.1.0"
+authors = ["Surma <surma@surma.link>"]
+
+[lib]
+path = "lib.rs"
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+cfg-if = "0.1.2"
+wasm-bindgen = "0.2"
+oxipng = "2.2.0"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+console_error_panic_hook = { version = "0.1.1", optional = true }
+
+# `wee_alloc` is a tiny allocator for wasm that is only ~1K in code size
+# compared to the default allocator's ~10K. It is slower than the default
+# allocator, however.
+#
+# Unfortunately, `wee_alloc` requires nightly Rust when targeting wasm for now.
+wee_alloc = { version = "0.4.2", optional = true }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.2"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"

codecs/oxipng/README.md

@@ -0,0 +1,52 @@
+# 🦀🕸️ `wasm-pack-template`
+
+A template for kick starting a Rust and WebAssembly project using
+[`wasm-pack`](https://github.com/rustwasm/wasm-pack).
+
+This template is designed for compiling Rust libraries into WebAssembly and
+publishing the resulting package to NPM.
+
+* Want to use the published NPM package in a Website? [Check out
+  `create-wasm-app`.](https://github.com/rustwasm/create-wasm-app)
+* Want to make a monorepo-style Website without publishing to NPM? Check out
+  [`rust-webpack-template`](https://github.com/rustwasm/rust-webpack-template)
+  and/or
+  [`rust-parcel-template`](https://github.com/rustwasm/rust-parcel-template).
+
+## 🔋 Batteries Included
+
+* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
+  between WebAssembly and JavaScript.
+* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
+  for logging panic messages to the developer console.
+* [`wee_alloc`](https://github.com/rustwasm/wee_alloc), an allocator optimized
+  for small code size.
+
+## 🚴 Usage
+
+### 🐑 Use `cargo generate` to Clone this Template
+
+[Learn more about `cargo generate` here.](https://github.com/ashleygwilliams/cargo-generate)
+
+```
+cargo generate --git https://github.com/rustwasm/wasm-pack-template.git --name my-project
+cd my-project
+```
+
+### 🛠️ Build with `wasm-pack build`
+
+```
+wasm-pack build
+```
+
+### 🔬 Test in Headless Browsers with `wasm-pack test`
+
+```
+wasm-pack test --headless --firefox
+```
+
+### 🎁 Publish to NPM with `wasm-pack publish`
+
+```
+wasm-pack publish
+```

codecs/oxipng/Xargo.toml

@@ -0,0 +1,5 @@
+[target.wasm32-unknown-unknown.dependencies]
+time = {}
+
+[target.wasm32-unknown-unknown.dependencies.std]
+features = ["wasm_syscall"]

codecs/oxipng/pkg/README.md

@@ -0,0 +1,52 @@
+# 🦀🕸️ `wasm-pack-template`
+
+A template for kick starting a Rust and WebAssembly project using
+[`wasm-pack`](https://github.com/rustwasm/wasm-pack).
+
+This template is designed for compiling Rust libraries into WebAssembly and
+publishing the resulting package to NPM.
+
+* Want to use the published NPM package in a Website? [Check out
+  `create-wasm-app`.](https://github.com/rustwasm/create-wasm-app)
+* Want to make a monorepo-style Website without publishing to NPM? Check out
+  [`rust-webpack-template`](https://github.com/rustwasm/rust-webpack-template)
+  and/or
+  [`rust-parcel-template`](https://github.com/rustwasm/rust-parcel-template).
+
+## 🔋 Batteries Included
+
+* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
+  between WebAssembly and JavaScript.
+* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
+  for logging panic messages to the developer console.
+* [`wee_alloc`](https://github.com/rustwasm/wee_alloc), an allocator optimized
+  for small code size.
+
+## 🚴 Usage
+
+### 🐑 Use `cargo generate` to Clone this Template
+
+[Learn more about `cargo generate` here.](https://github.com/ashleygwilliams/cargo-generate)
+
+```
+cargo generate --git https://github.com/rustwasm/wasm-pack-template.git --name my-project
+cd my-project
+```
+
+### 🛠️ Build with `wasm-pack build`
+
+```
+wasm-pack build
+```
+
+### 🔬 Test in Headless Browsers with `wasm-pack test`
+
+```
+wasm-pack test --headless --firefox
+```
+
+### 🎁 Publish to NPM with `wasm-pack publish`
+
+```
+wasm-pack publish
+```

codecs/oxipng/pkg/lol.js

@@ -0,0 +1,14 @@
+const oxipng = require("./oxipng_wasm");
+const repl = require("repl");
+const fs = require("fs");
+
+async function init() {
+  // const img = fs.readFileSync("img.png")
+  // const output = oxipng.compress(img, 0);
+  // fs.writeFileSync("output.png", output);
+  console.log(">>>", oxipng.doit());
+  const r = repl.start("node> ");
+  r.context.i = oxipng;
+}
+
+init();

codecs/oxipng/pkg/oxipng.d.ts

@@ -0,0 +1,3 @@
+/* tslint:disable */
+export function compress(arg0: Uint8Array, arg1: number): Uint8Array;
+

codecs/oxipng/pkg/oxipng.js

@@ -0,0 +1,73 @@
+/* tslint:disable */
+var wasm;
+
+const TextDecoder = require('util').TextDecoder;
+
+let cachedTextDecoder = new TextDecoder('utf-8');
+
+let cachegetUint8Memory = null;
+function getUint8Memory() {
+    if (cachegetUint8Memory === null || cachegetUint8Memory.buffer !== wasm.memory.buffer) {
+        cachegetUint8Memory = new Uint8Array(wasm.memory.buffer);
+    }
+    return cachegetUint8Memory;
+}
+
+function getStringFromWasm(ptr, len) {
+    return cachedTextDecoder.decode(getUint8Memory().subarray(ptr, ptr + len));
+}
+
+module.exports.__wbg_log_64e6f53d8e6d5db5 = function(arg0, arg1) {
+    let varg0 = getStringFromWasm(arg0, arg1);
+    console.log(varg0);
+};
+
+let WASM_VECTOR_LEN = 0;
+
+function passArray8ToWasm(arg) {
+    const ptr = wasm.__wbindgen_malloc(arg.length * 1);
+    getUint8Memory().set(arg, ptr / 1);
+    WASM_VECTOR_LEN = arg.length;
+    return ptr;
+}
+
+function getArrayU8FromWasm(ptr, len) {
+    return getUint8Memory().subarray(ptr / 1, ptr / 1 + len);
+}
+
+let cachedGlobalArgumentPtr = null;
+function globalArgumentPtr() {
+    if (cachedGlobalArgumentPtr === null) {
+        cachedGlobalArgumentPtr = wasm.__wbindgen_global_argument_ptr();
+    }
+    return cachedGlobalArgumentPtr;
+}
+
+let cachegetUint32Memory = null;
+function getUint32Memory() {
+    if (cachegetUint32Memory === null || cachegetUint32Memory.buffer !== wasm.memory.buffer) {
+        cachegetUint32Memory = new Uint32Array(wasm.memory.buffer);
+    }
+    return cachegetUint32Memory;
+}
+/**
+* @param {Uint8Array} arg0
+* @param {number} arg1
+* @returns {Uint8Array}
+*/
+module.exports.compress = function(arg0, arg1) {
+    const ptr0 = passArray8ToWasm(arg0);
+    const len0 = WASM_VECTOR_LEN;
+    const retptr = globalArgumentPtr();
+    wasm.compress(retptr, ptr0, len0, arg1);
+    const mem = getUint32Memory();
+    const rustptr = mem[retptr / 4];
+    const rustlen = mem[retptr / 4 + 1];
+
+    const realRet = getArrayU8FromWasm(rustptr, rustlen).slice();
+    wasm.__wbindgen_free(rustptr, rustlen * 1);
+    return realRet;
+
+};
+
+wasm = require('./oxipng_bg');

codecs/oxipng/pkg/oxipng_bg.d.ts

@@ -0,0 +1,6 @@
+/* tslint:disable */
+export const memory: WebAssembly.Memory;
+export function __wbindgen_global_argument_ptr(): number;
+export function compress(a: number, b: number, c: number, d: number): void;
+export function __wbindgen_malloc(a: number): number;
+export function __wbindgen_free(a: number, b: number): void;

codecs/oxipng/pkg/oxipng_bg.js

@@ -0,0 +1,9 @@
+
+const path = require('path').join(__dirname, 'oxipng_bg.wasm');
+const bytes = require('fs').readFileSync(path);
+let imports = {};
+imports['./oxipng'] = require('./oxipng');
+
+const wasmModule = new WebAssembly.Module(bytes);
+const wasmInstance = new WebAssembly.Instance(wasmModule, imports);
+module.exports = wasmInstance.exports;

codecs/oxipng/pkg/oxipng_manual.d.ts

@@ -0,0 +1,3 @@
+/* tslint:disable */
+export function compress(arg0: Uint8Array, arg1: number): Promise<Uint8Array>;
+

codecs/oxipng/pkg/oxipng_manual.js

@@ -0,0 +1,77 @@
+/* tslint:disable */
+import wasmUrl from './oxipng_bg.wasm';
+
+let wasm;
+const instancePromise = WebAssembly.instantiateStreaming(fetch(wasmUrl), {
+  "./oxipng": {__wbg_log_64e6f53d8e6d5db5}
+});
+
+let cachedTextDecoder = new TextDecoder('utf-8');
+
+let cachegetUint8Memory = null;
+function getUint8Memory() {
+    if (cachegetUint8Memory === null || cachegetUint8Memory.buffer !== wasm.memory.buffer) {
+        cachegetUint8Memory = new Uint8Array(wasm.memory.buffer);
+    }
+    return cachegetUint8Memory;
+}
+
+function getStringFromWasm(ptr, len) {
+    return cachedTextDecoder.decode(getUint8Memory().subarray(ptr, ptr + len));
+}
+
+export function __wbg_log_64e6f53d8e6d5db5(arg0, arg1) {
+    let varg0 = getStringFromWasm(arg0, arg1);
+    console.log(varg0);
+}
+
+let WASM_VECTOR_LEN = 0;
+
+function passArray8ToWasm(arg) {
+    const ptr = wasm.__wbindgen_malloc(arg.length * 1);
+    getUint8Memory().set(arg, ptr / 1);
+    WASM_VECTOR_LEN = arg.length;
+    return ptr;
+}
+
+function getArrayU8FromWasm(ptr, len) {
+    return getUint8Memory().subarray(ptr / 1, ptr / 1 + len);
+}
+
+let cachedGlobalArgumentPtr = null;
+function globalArgumentPtr() {
+    if (cachedGlobalArgumentPtr === null) {
+        cachedGlobalArgumentPtr = wasm.__wbindgen_global_argument_ptr();
+    }
+    return cachedGlobalArgumentPtr;
+}
+
+let cachegetUint32Memory = null;
+function getUint32Memory() {
+    if (cachegetUint32Memory === null || cachegetUint32Memory.buffer !== wasm.memory.buffer) {
+        cachegetUint32Memory = new Uint32Array(wasm.memory.buffer);
+    }
+    return cachegetUint32Memory;
+}
+/**
+* @param {Uint8Array} arg0
+* @param {number} arg1
+* @returns {Uint8Array}
+*/
+export async function compress(arg0, arg1) {
+    wasm = (await instancePromise).instance.exports;
+    debugger;
+    const ptr0 = passArray8ToWasm(arg0);
+    const len0 = WASM_VECTOR_LEN;
+    const retptr = globalArgumentPtr();
+    wasm.compress(retptr, ptr0, len0, arg1);
+    const mem = getUint32Memory();
+    const rustptr = mem[retptr / 4];
+    const rustlen = mem[retptr / 4 + 1];
+
+    const realRet = getArrayU8FromWasm(rustptr, rustlen).slice();
+    wasm.__wbindgen_free(rustptr, rustlen * 1);
+    return realRet;
+
+}
+

codecs/oxipng/pkg/oxipng_wasm.d.ts

@@ -0,0 +1,3 @@
+/* tslint:disable */
+export function doit(): number;
+

codecs/oxipng/pkg/oxipng_wasm.js

@@ -0,0 +1,11 @@
+/* tslint:disable */
+var wasm;
+
+/**
+* @returns {number}
+*/
+module.exports.doit = function() {
+    return wasm.doit();
+};
+
+wasm = require('./oxipng_wasm_bg');

codecs/oxipng/pkg/oxipng_wasm_bg.d.ts

@@ -0,0 +1,3 @@
+/* tslint:disable */
+export const memory: WebAssembly.Memory;
+export function doit(): number;

codecs/oxipng/pkg/oxipng_wasm_bg.js

@@ -0,0 +1,8 @@
+
+const path = require('path').join(__dirname, 'oxipng_wasm_bg.wasm');
+const bytes = require('fs').readFileSync(path);
+let imports = {};
+
+const wasmModule = new WebAssembly.Module(bytes);
+const wasmInstance = new WebAssembly.Instance(wasmModule, imports);
+module.exports = wasmInstance.exports;

codecs/oxipng/pkg/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "oxipng-wasm",
+  "collaborators": [
+    "Surma <surma@surma.link>"
+  ],
+  "version": "0.1.0",
+  "files": [
+    "oxipng_wasm_bg.wasm",
+    "oxipng_wasm.js",
+    "oxipng_wasm_bg.js",
+    "oxipng_wasm.d.ts"
+  ],
+  "main": "oxipng_wasm.js",
+  "types": "oxipng_wasm.d.ts"
+}

codecs/oxipng/src/lib.rs

@@ -0,0 +1,42 @@
+extern crate cfg_if;
+extern crate wasm_bindgen;
+// extern crate oxipng;
+
+mod utils;
+
+use cfg_if::cfg_if;
+use wasm_bindgen::prelude::*;
+use std::time::{Instant};
+cfg_if! {
+    // When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
+    // allocator.
+    if #[cfg(feature = "wee_alloc")] {
+        extern crate wee_alloc;
+        #[global_allocator]
+        static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+    }
+}
+
+// #[wasm_bindgen]
+// extern {
+//   #[wasm_bindgen(js_namespace = console)]
+//   fn log(s: &str);
+// }
+
+// #[wasm_bindgen]
+// pub fn compress(img: Vec<u8>, level: u8) -> Vec<u8> {
+//   log(&format!("len: {}, level: {}", img.len(), level));
+//   let mut options = oxipng::Options::from_preset(level);
+//   options.threads = 0;
+//   let result = oxipng::optimize_from_memory(img.as_slice(), &options);
+//   match result {
+//     Ok(v) => v,
+//     Err(e) => e.to_string().as_bytes().to_vec()
+//   }
+// }
+
+#[wasm_bindgen]
+pub fn doit() -> u32 {
+  let start = Instant::now();
+  start.elapsed().as_secs() as u32
+}

codecs/oxipng/src/utils.rs

@@ -0,0 +1,17 @@
+use cfg_if::cfg_if;
+
+cfg_if! {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    if #[cfg(feature = "console_error_panic_hook")] {
+        extern crate console_error_panic_hook;
+        pub use self::console_error_panic_hook::set_once as set_panic_hook;
+    } else {
+        #[inline]
+        pub fn set_panic_hook() {}
+    }
+}

codecs/oxipng/tmp/.gitignore

@@ -0,0 +1 @@
+target

codecs/oxipng/tmp/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "loltest"
+version = "0.1.0"
+authors = ["Surma <surma@surma.link>"]
+
+[lib]
+path = "lib.rs"
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+wasm-bindgen = "0.2"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+console_error_panic_hook = { version = "0.1.1", optional = true }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.2"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"

codecs/oxipng/tmp/Xargo.toml

@@ -0,0 +1,2 @@
+[dependencies.std]
+features = ["wasm_syscall"]

codecs/oxipng/tmp/_README.md

@@ -0,0 +1,20 @@
+I’m trying to activate [the `wasm_syscall` feature][1] in Rust’s stdlib for WebAssembly.
+
+Here is my `Cargo.toml` and my `Xargo.toml`. But even with this setup the generated wasm file is still hard-coded to panic.
+
+**HELP?**
+
+My current command to compile is:
+
+```
+xargo build --target wasm32-unknown-unknown --release
+```
+
+If you have [`wasm2wat`][2] installed, you can verify the generate code via
+
+```
+wasm2wat target/wasm32-unknown-unknown/release/loltest.wasm | grep -A5 perform::
+```
+
+[1]: https://github.com/rust-lang/rust/blob/b139669f374eb5024a50eb13f116ff763b1c5935/src/libstd/sys/wasm/mod.rs#L309
+[2]: https://github.com/WebAssembly/wabt

codecs/oxipng/tmp/lib.rs

@@ -0,0 +1,14 @@
+extern crate wasm_bindgen;
+
+use wasm_bindgen::prelude::*;
+use std::thread::spawn;
+
+#[wasm_bindgen]
+pub fn doit() {
+  // let child = spawn(move || -> u32 {
+  //   5
+  // });
+  // let result = child.join().unwrap();
+  let result = spawn();
+  println!("Result: {}", result);
+}

codecs/oxipng/tmp/lol.js

@@ -0,0 +1,47 @@
+// const oxipng = require("./oxipng_wasm");
+const repl = require("repl");
+const fs = require("fs");
+
+const dec = new TextDecoder();
+let buffer = '';
+async function init() {
+  const { instance } = await WebAssembly.instantiate(
+    fs.readFileSync("./target/wasm32-unknown-unknown/release/loltest.wasm"),
+    {
+      __wbindgen_placeholder__: {
+        __wbindgen_describe(v) {
+          console.log(`__wbindgen_desribe(${v})`);
+        }
+      },
+      env: {
+        // See https://github.com/rust-lang/rust/blob/master/src/libstd/sys/wasm/mod.rs
+        rust_wasm_syscall(syscall, ptr) {
+          switch(syscall) {
+            case 1: // Write
+              const [fd, dataPtr, len] = new Uint32Array(instance.exports.memory.buffer, ptr, 3 * 4);
+              const fragment = new Uint8Array(instance.exports.memory.buffer, dataPtr, len);
+              buffer += dec.decode(fragment);
+              const idx = buffer.indexOf('\n');
+              if(idx !== -1) {
+                console.log(buffer.slice(0, idx));
+                buffer = buffer.slice(idx);
+              }
+              return 1;
+            case 6: // Time
+              return 1;
+            default:
+              return 0; // False, unimplemented
+          }
+        }
+      }
+    }
+  );
+
+  try {
+    instance.exports.doit();
+  } catch{}
+  const r = repl.start("node> ");
+  r.context.i = instance;
+}
+
+init();

codecs/webp_dec/README.md

@@ -1,7 +1,7 @@
 # WebP decoder
 
 - Source: <https://github.com/webmproject/libwebp>
-- Version: v0.6.1
+- Version: v1.0.2
 
 ## Example
 

codecs/webp_dec/build.sh

@@ -6,7 +6,33 @@ export OPTIMIZE="-Os"
 export LDFLAGS="${OPTIMIZE}"
 export CFLAGS="${OPTIMIZE}"
 export CPPFLAGS="${OPTIMIZE}"
+apt-get update
+apt-get install -qqy autoconf libtool libpng-dev pkg-config
 
+echo "============================================="
+echo "Compiling libwebp"
+echo "============================================="
+test -n "$SKIP_LIBWEBP" || (
+  cd node_modules/libwebp
+  autoreconf -fiv
+  rm -rf build || true
+  mkdir -p build && cd build
+  emconfigure ../configure \
+    --disable-libwebpdemux \
+    --disable-wic \
+    --disable-gif \
+    --disable-tiff \
+    --disable-jpeg \
+    --disable-png \
+    --disable-sdl \
+    --disable-gl \
+    --disable-threading \
+    --disable-neon-rtcd \
+    --disable-neon \
+    --disable-sse2 \
+    --disable-sse4.1
+  emmake make
+)
 echo "============================================="
 echo "Compiling wasm bindings"
 echo "============================================="
@@ -20,9 +46,9 @@ echo "============================================="
     --std=c++11 \
     -I node_modules/libwebp \
     -o ./webp_dec.js \
-    node_modules/libwebp/src/{dec,dsp,demux,enc,mux,utils}/*.c \
     -x c++ \
-    webp_dec.cpp
+    webp_dec.cpp \
+    node_modules/libwebp/build/src/.libs/libwebp.a
 )
 echo "============================================="
 echo "Compiling wasm bindings done"

codecs/webp_dec/package.json

@@ -5,9 +5,9 @@
     "build": "docker run --rm -v $(pwd):/src trzeci/emscripten ./build.sh"
   },
   "napa": {
-    "libwebp": "webmproject/libwebp#v1.0.0"
+    "libwebp": "webmproject/libwebp#v1.0.2"
   },
   "devDependencies": {
-    "napa": "^3.0.0"
+    "napa": "3.0.0"
   }
 }

codecs/webp_enc/README.md

@@ -1,7 +1,7 @@
 # WebP encoder
 
 - Source: <https://github.com/webmproject/libwebp>
-- Version: v0.6.1
+- Version: v1.0.2
 
 ## Dependencies
 

codecs/webp_enc/build.sh

@@ -7,6 +7,33 @@ export LDFLAGS="${OPTIMIZE}"
 export CFLAGS="${OPTIMIZE}"
 export CPPFLAGS="${OPTIMIZE}"
 
+apt-get update
+apt-get install -qqy autoconf libtool libpng-dev pkg-config
+
+echo "============================================="
+echo "Compiling libwebp"
+echo "============================================="
+test -n "$SKIP_LIBWEBP" || (
+  cd node_modules/libwebp
+  autoreconf -fiv
+  rm -rf build || true
+  mkdir -p build && cd build
+  emconfigure ../configure \
+    --disable-libwebpdemux \
+    --disable-wic \
+    --disable-gif \
+    --disable-tiff \
+    --disable-jpeg \
+    --disable-png \
+    --disable-sdl \
+    --disable-gl \
+    --disable-threading \
+    --disable-neon-rtcd \
+    --disable-neon \
+    --disable-sse2 \
+    --disable-sse4.1
+  emmake make
+)
 echo "============================================="
 echo "Compiling wasm bindings"
 echo "============================================="
@@ -20,9 +47,9 @@ echo "============================================="
     --std=c++11 \
     -I node_modules/libwebp \
     -o ./webp_enc.js \
-    node_modules/libwebp/src/{dec,dsp,demux,enc,mux,utils}/*.c \
     -x c++ \
-    webp_enc.cpp
+    webp_enc.cpp \
+    node_modules/libwebp/build/src/.libs/libwebp.a
 )
 echo "============================================="
 echo "Compiling wasm bindings done"

codecs/webp_enc/package.json

@@ -5,9 +5,9 @@
     "build": "docker run --rm -v $(pwd):/src trzeci/emscripten ./build.sh"
   },
   "napa": {
-    "libwebp": "webmproject/libwebp#v1.0.0"
+    "libwebp": "webmproject/libwebp#v1.0.2"
   },
   "devDependencies": {
-    "napa": "^3.0.0"
+    "napa": "3.0.0"
   }
 }

codecs/webp_enc/webp_enc.cpp

@@ -26,7 +26,8 @@ val encode(std::string img, int width, int height, WebPConfig config) {
     throw std::runtime_error("Unexpected error");
   }
 
-  pic.use_argb = !!config.lossless;
+  // Only use use_argb if we really need it, as it's slower.
+  pic.use_argb = config.lossless || config.use_sharp_yuv || config.preprocessing > 0;
   pic.width = width;
   pic.height = height;
   pic.writer = WebPMemoryWrite;

config/add-css-types.js

@@ -0,0 +1,74 @@
+const DtsCreator = require('typed-css-modules');
+const chokidar = require('chokidar');
+const util = require('util');
+const sass = require('node-sass');
+
+const sassRender = util.promisify(sass.render);
+
+async function sassToCss(path) {
+  const result = await sassRender({ file: path });
+  return result.css;
+}
+
+/**
+ * @typedef {Object} Opts
+ * @property {boolean} watch Watch for changes
+ */
+/**
+ * Create typing files for CSS & SCSS.
+ *
+ * @param {string[]} rootPaths Paths to search within
+ * @param {Opts} [opts={}] Options.
+ */
+function addCssTypes(rootPaths, opts = {}) {
+  return new Promise((resolve) => {
+    const { watch = false } = opts;
+
+    const paths = [];
+    const preReadyPromises = [];
+    let ready = false;
+
+    for (const rootPath of rootPaths) {
+      // Look for scss & css in each path.
+      paths.push(rootPath + '/**/*.scss');
+      paths.push(rootPath + '/**/*.css');
+    }
+
+    // For simplicity, the watcher is used even if we're not watching.
+    // If we're not watching, we stop the watcher after the initial files are found.
+    const watcher = chokidar.watch(paths, {
+      // Avoid processing already-processed files.
+      ignored: '*.d.*',
+      // Without this, travis and netlify builds never complete. I'm not sure why, but it might be
+      // related to https://github.com/paulmillr/chokidar/pull/758
+      persistent: watch,
+    });
+
+    function change(path) {
+      const promise = (async function() {
+        const creator = new DtsCreator({ camelCase: true });
+        const result = path.endsWith('.scss') ?
+          await creator.create(path, await sassToCss(path)) :
+          await creator.create(path);
+
+        await result.writeFile();
+      })();
+
+      if (!ready) preReadyPromises.push(promise);
+    }
+
+    watcher.on('change', change);
+    watcher.on('add', change);
+
+    // 'ready' is when events have been fired for file discovery.
+    watcher.on('ready', () => {
+      ready = true;
+      // Wait for the current set of processing to finish.
+      Promise.all(preReadyPromises).then(resolve);
+      // And if we're not watching, close the watcher.
+      if (!watch) watcher.close();
+    });
+  })
+}
+
+module.exports = addCssTypes;

config/asset-template-plugin.js

@@ -0,0 +1,47 @@
+const path = require('path');
+const fs = require('fs');
+const ejs = require('ejs');
+const AssetsPlugin = require('assets-webpack-plugin');
+
+module.exports = class AssetTemplatePlugin extends AssetsPlugin {
+  constructor(options) {
+    options = options || {};
+    if (!options.template) throw Error('AssetTemplatePlugin: template option is required.');
+    super({
+      useCompilerPath: true,
+      filename: options.filename,
+      processOutput: files => this._processOutput(files)
+    });
+    this._template = path.resolve(process.cwd(), options.template);
+    const ignore = options.ignore || /(manifest\.json|\.DS_Store)$/;
+    this._ignore = typeof ignore === 'function' ? ({ test: ignore }) : ignore;
+  }
+
+  _processOutput(files) {
+    const mapping = {
+      all: [],
+      byType: {},
+      entries: {}
+    };
+    for (const entryName in files) {
+      // non-entry-point-derived assets are collected under an empty string key
+      // since that's a bit awkward, we'll call them "assets"
+      const name = entryName === '' ? 'assets' : entryName;
+      const listing = files[entryName];
+      const entry = mapping.entries[name] = {
+        all: [],
+        byType: {}
+      };
+      for (let type in listing) {
+        const list = [].concat(listing[type]).filter(file => !this._ignore.test(file));
+        if (!list.length) continue;
+        mapping.all = mapping.all.concat(list);
+        mapping.byType[type] = (mapping.byType[type] || []).concat(list);
+        entry.all = entry.all.concat(list);
+        entry.byType[type] = (entry.byType[type] || []).concat(list);
+      }
+    }
+    mapping.files = mapping.all;
+    return ejs.render(fs.readFileSync(this._template, 'utf8'), mapping);
+  }
+};

config/auto-sw-plugin.js

@@ -0,0 +1,158 @@
+const util = require('util');
+const minimatch = require('minimatch');
+const SingleEntryPlugin = require('webpack/lib/SingleEntryPlugin');
+const WebWorkerTemplatePlugin = require('webpack/lib/webworker/WebWorkerTemplatePlugin');
+const ParserHelpers = require('webpack/lib/ParserHelpers');
+
+const NAME = 'auto-sw-plugin';
+const JS_TYPES = ['auto', 'esm', 'dynamic'];
+
+/**
+ * Automatically finds and bundles Service Workers by looking for navigator.serviceWorker.register(..).
+ * An Array of webpack assets is injected into the Service Worker bundle as a `BUILD_ASSETS` global.
+ * Hidden and `.map` files are excluded by default, and this can be customized using the include & exclude options.
+ * @example
+ *  // webpack config
+ *  plugins: [
+ *    new AutoSWPlugin({
+ *      exclude: [
+ *        '**\/.*',     // don't expose hidden files (default)
+ *        '**\/*.map',  // don't precache sourcemaps (default)
+ *        'index.html'  // don't cache the page itself
+ *      ]
+ *    })
+ *  ]
+ * @param {Object} [options={}]
+ * @param {string[]} [options.exclude]  Minimatch pattern(s) of which assets to omit from BUILD_ASSETS.
+ * @param {string[]} [options.include]  Minimatch pattern(s) of assets to allow in BUILD_ASSETS.
+ */
+module.exports = class AutoSWPlugin {
+  constructor(options) {
+    this.options = Object.assign({
+      exclude: [
+        '**/*.map',
+        '**/.*'
+      ]
+    }, options || {});
+  }
+
+  apply(compiler) {
+    const serviceWorkers = [];
+
+    compiler.hooks.emit.tapPromise(NAME, compilation => this.emit(compiler, compilation, serviceWorkers));
+
+    compiler.hooks.normalModuleFactory.tap(NAME, (factory) => {
+      for (const type of JS_TYPES) {
+        factory.hooks.parser.for(`javascript/${type}`).tap(NAME, parser => {
+          let counter = 0;
+
+          const processRegisterCall = expr => {
+            const dep = parser.evaluateExpression(expr.arguments[0]);
+
+            if (!dep.isString()) {
+              parser.state.module.warnings.push({
+                message: 'navigator.serviceWorker.register() will only be bundled if passed a String literal.'
+              });
+              return false;
+            }
+
+            const filename = dep.string;
+            const outputFilename = this.options.filename || 'serviceworker.js'
+            const context = parser.state.current.context;
+            serviceWorkers.push({
+              outputFilename,
+              filename,
+              context
+            });
+
+            const id = `__webpack__serviceworker__${++counter}`;
+            ParserHelpers.toConstantDependency(parser, id)(expr.arguments[0]);
+            return ParserHelpers.addParsedVariableToModule(parser, id, '__webpack_public_path__ + ' + JSON.stringify(outputFilename));
+          };
+
+          parser.hooks.call.for('navigator.serviceWorker.register').tap(NAME, processRegisterCall);
+          parser.hooks.call.for('self.navigator.serviceWorker.register').tap(NAME, processRegisterCall);
+          parser.hooks.call.for('window.navigator.serviceWorker.register').tap(NAME, processRegisterCall);
+        });
+      }
+    });
+  }
+
+  createFilter(list) {
+    const filters = [].concat(list);
+    for (let i=0; i<filters.length; i++) {
+      if (typeof filters[i] === 'string') {
+        filters[i] = minimatch.filter(filters[i]);
+      }
+    }
+    return filters;
+  }
+
+  async emit(compiler, compilation, serviceWorkers) {
+    let assetMapping = Object.keys(compilation.assets);
+    if (this.options.include) {
+      const filters = this.createFilter(this.options.include);
+      assetMapping = assetMapping.filter(filename => {
+        for (const filter of filters) {
+          if (filter(filename)) return true;
+        }
+        return false;
+      });
+    }
+    if (this.options.exclude) {
+      const filters = this.createFilter(this.options.exclude);
+      assetMapping = assetMapping.filter(filename => {
+        for (const filter of filters) {
+          if (filter(filename)) return false;
+        }
+        return true;
+      });
+    }
+    await Promise.all(serviceWorkers.map(
+      (serviceWorker, index) => this.compileServiceWorker(compiler, compilation, serviceWorker, index, assetMapping)
+    ));
+  }
+
+  async compileServiceWorker(compiler, compilation, options, index, assetMapping) {
+    const entryFilename = options.filename;
+
+    const chunkFilename = compiler.options.output.chunkFilename.replace(/\.([a-z]+)$/i, '.serviceworker.$1');
+    const workerOptions = {
+      filename: options.outputFilename, // chunkFilename.replace(/\.?\[(?:chunkhash|contenthash|hash)(:\d+(?::\d+)?)?\]/g, ''),
+      chunkFilename: this.options.chunkFilename || chunkFilename,
+      globalObject: 'self'
+    };
+
+    const childCompiler = compilation.createChildCompiler(NAME, { filename: workerOptions.filename });
+    (new WebWorkerTemplatePlugin(workerOptions)).apply(childCompiler);
+
+    /* The duplication DefinePlugin ends up causing is problematic (it doesn't hoist injections), so we'll do it manually. */
+    // (new DefinePlugin({
+    //   BUILD_ASSETS: JSON.stringify(assetMapping)
+    // })).apply(childCompiler);
+    (new SingleEntryPlugin(options.context, entryFilename, workerOptions.filename)).apply(childCompiler);
+
+    const subCache = `subcache ${__dirname} ${entryFilename} ${index}`;
+    let childCompilation;
+    childCompiler.hooks.compilation.tap(NAME, c => {
+      childCompilation = c;
+      if (childCompilation.cache) {
+        if (!childCompilation.cache[subCache]) childCompilation.cache[subCache] = {};
+        childCompilation.cache = childCompilation.cache[subCache];
+      }
+    });
+
+    await (util.promisify(childCompiler.runAsChild.bind(childCompiler)))();
+
+    const versionVar = this.options.version ?
+      `var VERSION = ${JSON.stringify(this.options.version)};` : '';
+    const original = childCompilation.assets[workerOptions.filename].source();
+    const source = `${versionVar}var BUILD_ASSETS=${JSON.stringify(assetMapping)};${original}`;
+    childCompilation.assets[workerOptions.filename] = {
+      source: () => source,
+      size: () => Buffer.byteLength(source, 'utf8')
+    };
+
+    Object.assign(compilation.assets, childCompilation.assets);
+  }
+};

global.d.ts

@@ -1,16 +1,21 @@
 declare const __webpack_public_path__: string;
+declare const PRERENDER: boolean;
 
 declare interface NodeModule {
   hot: any;
 }
 
 declare interface Window {
-  STATE: any
+  STATE: any;
+  ga: typeof ga;
 }
 
 declare namespace JSX {
   interface Element { }
   interface IntrinsicElements { }
+  interface HTMLAttributes {
+    decoding?: string;
+  }
 }
 
 declare module 'classnames' {

package.json

@@ -1,13 +1,13 @@
 {
   "private": true,
   "name": "squoosh",
-  "version": "0.0.0",
+  "version": "1.3.1",
   "license": "apache-2.0",
   "scripts": {
-    "start": "webpack serve --host 0.0.0.0 --hot",
+    "start": "webpack-dev-server --host 0.0.0.0 --hot",
     "build": "webpack -p",
-    "lint": "tslint -c tslint.json -t verbose 'src/**/*.{ts,tsx,js,jsx}'",
-    "lintfix": "tslint -c tslint.json -t verbose --fix 'src/**/*.{ts,tsx,js,jsx}'"
+    "lint": "tslint -c tslint.json  -p tsconfig.json -t verbose 'src/**/*.{ts,tsx,js,jsx}'",
+    "lintfix": "tslint -c tslint.json -p tsconfig.json -t verbose --fix 'src/**/*.{ts,tsx,js,jsx}'"
   },
   "husky": {
     "hooks": {
@@ -15,57 +15,55 @@
     }
   },
   "devDependencies": {
-    "@types/node": "^9.6.35",
-    "@types/pretty-bytes": "^5.1.0",
-    "@types/webassembly-js-api": "0.0.1",
-    "@webcomponents/custom-elements": "^1.2.1",
-    "babel-loader": "^7.1.5",
-    "babel-plugin-jsx-pragmatic": "^1.0.2",
-    "babel-plugin-syntax-dynamic-import": "^6.18.0",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-plugin-transform-decorators-legacy": "^1.3.5",
-    "babel-plugin-transform-object-rest-spread": "^6.26.0",
-    "babel-plugin-transform-react-constant-elements": "^6.23.0",
-    "babel-plugin-transform-react-jsx": "^6.24.1",
-    "babel-plugin-transform-react-remove-prop-types": "^0.4.19",
-    "babel-preset-env": "^1.7.0",
-    "babel-register": "^6.26.0",
-    "clean-webpack-plugin": "^0.1.19",
-    "copy-webpack-plugin": "^4.5.3",
-    "css-loader": "^0.28.11",
-    "exports-loader": "^0.7.0",
-    "file-loader": "^1.1.11",
-    "html-webpack-plugin": "^3.2.0",
-    "husky": "^1.1.2",
-    "if-env": "^1.0.4",
-    "loader-utils": "^1.1.0",
-    "mini-css-extract-plugin": "^0.3.0",
-    "node-sass": "^4.9.4",
-    "optimize-css-assets-webpack-plugin": "^4.0.3",
-    "progress-bar-webpack-plugin": "^1.11.0",
-    "raw-loader": "^0.5.1",
-    "sass-loader": "^7.1.0",
-    "script-ext-html-webpack-plugin": "^2.0.1",
-    "source-map-loader": "^0.2.3",
-    "style-loader": "^0.22.1",
-    "ts-loader": "^4.4.2",
-    "tslint": "^5.11.0",
-    "tslint-config-airbnb": "^5.9.2",
-    "tslint-config-semistandard": "^7.0.0",
-    "tslint-react": "^3.6.0",
-    "typescript": "^2.9.2",
-    "typings-for-css-modules-loader": "^1.7.0",
-    "webpack": "=4.19.1",
-    "webpack-bundle-analyzer": "^2.13.1",
-    "webpack-cli": "^2.1.5",
-    "webpack-dev-server": "^3.1.5",
-    "webpack-plugin-replace": "^1.1.1",
-    "classnames": "^2.2.6",
-    "comlink": "^3.0.3",
-    "linkstate": "^1.1.1",
-    "preact": "^8.3.1",
-    "pretty-bytes": "^5.1.0",
-    "worker-plugin": "^1.1.1",
-    "file-drop-element": "0.0.7"
+    "@types/node": "10.12.21",
+    "@types/pretty-bytes": "5.1.0",
+    "@types/webassembly-js-api": "0.0.2",
+    "@webcomponents/custom-elements": "1.2.1",
+    "@webpack-cli/serve": "0.1.3",
+    "assets-webpack-plugin": "3.9.7",
+    "chokidar": "2.0.4",
+    "classnames": "2.2.6",
+    "clean-webpack-plugin": "1.0.1",
+    "comlink": "3.1.1",
+    "copy-webpack-plugin": "4.6.0",
+    "critters-webpack-plugin": "2.2.0",
+    "css-loader": "1.0.1",
+    "ejs": "2.6.1",
+    "exports-loader": "0.7.0",
+    "file-drop-element": "0.0.9",
+    "file-loader": "3.0.1",
+    "html-webpack-plugin": "3.2.0",
+    "husky": "1.3.1",
+    "idb-keyval": "3.1.0",
+    "linkstate": "1.1.1",
+    "loader-utils": "1.2.0",
+    "mini-css-extract-plugin": "0.5.0",
+    "minimatch": "3.0.4",
+    "node-sass": "4.11.0",
+    "optimize-css-assets-webpack-plugin": "5.0.1",
+    "pointer-tracker": "2.0.3",
+    "preact": "8.4.2",
+    "prerender-loader": "1.2.0",
+    "pretty-bytes": "5.1.0",
+    "progress-bar-webpack-plugin": "1.12.1",
+    "raw-loader": "1.0.0",
+    "sass-loader": "7.1.0",
+    "script-ext-html-webpack-plugin": "2.1.3",
+    "source-map-loader": "0.2.4",
+    "style-loader": "0.23.1",
+    "terser-webpack-plugin": "1.2.2",
+    "ts-loader": "5.3.3",
+    "tslint": "5.12.1",
+    "tslint-config-airbnb": "5.11.1",
+    "tslint-config-semistandard": "7.0.0",
+    "tslint-react": "3.6.0",
+    "typed-css-modules": "0.3.7",
+    "typescript": "3.2.4",
+    "url-loader": "1.1.2",
+    "webpack": "4.28.0",
+    "webpack-bundle-analyzer": "3.0.3",
+    "webpack-cli": "3.2.3",
+    "webpack-dev-server": "3.1.14",
+    "worker-plugin": "3.0.0"
   }
 }

renovate.json

@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "config:base"
+  ]
+}

src/codecs/decoders.ts

@@ -1,9 +1,8 @@
 import { nativeDecode, sniffMimeType, canDecodeImage } from '../lib/util';
 import Processor from './processor';
+import webpDataUrl from 'url-loader!./tiny.webp';
 
-// tslint:disable-next-line:max-line-length It’s a data URL. Whatcha gonna do?
-const webpFile = 'data:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAAAAAAfQ//73v/+BiOh/AAA=';
-const nativeWebPSupported = canDecodeImage(webpFile);
+const nativeWebPSupported = canDecodeImage(webpDataUrl);
 
 export async function decodeImage(blob: Blob, processor: Processor): Promise<ImageData> {
   const mimeType = await sniffMimeType(blob);

src/codecs/encoders.ts

@@ -1,5 +1,6 @@
 import * as identity from './identity/encoder-meta';
 import * as optiPNG from './optipng/encoder-meta';
+import * as oxiPNG from './oxipng/encoder-meta';
 import * as mozJPEG from './mozjpeg/encoder-meta';
 import * as webP from './webp/encoder-meta';
 import * as browserPNG from './browser-png/encoder-meta';
@@ -18,6 +19,7 @@ export interface EncoderSupportMap {
 export type EncoderState =
   identity.EncoderState |
   optiPNG.EncoderState |
+  oxiPNG.EncoderState |
   mozJPEG.EncoderState |
   webP.EncoderState |
   browserPNG.EncoderState |
@@ -32,6 +34,7 @@ export type EncoderState =
 export type EncoderOptions =
   identity.EncodeOptions |
   optiPNG.EncodeOptions |
+  oxiPNG.EncodeOptions |
   mozJPEG.EncodeOptions |
   webP.EncodeOptions |
   browserPNG.EncodeOptions |
@@ -48,6 +51,7 @@ export type EncoderType = keyof typeof encoderMap;
 export const encoderMap = {
   [identity.type]: identity,
   [optiPNG.type]: optiPNG,
+  [oxiPNG.type]: oxiPNG,
   [mozJPEG.type]: mozJPEG,
   [webP.type]: webP,
   [browserPNG.type]: browserPNG,

src/codecs/imagequant/options.tsx

@@ -1,6 +1,6 @@
 import { h, Component } from 'preact';
 import { bind } from '../../lib/initial-util';
-import { inputFieldValueAsNumber, konami } from '../../lib/util';
+import { inputFieldValueAsNumber, konami, preventDefault } from '../../lib/util';
 import { QuantizeOptions } from './processor-meta';
 import * as style from '../../components/Options/style.scss';
 import Expander from '../../components/expander';
@@ -42,7 +42,7 @@ export default class QuantizerOptions extends Component<Props, State> {
 
   render({ options }: Props, { extendedSettings }: State) {
     return (
-      <form class={style.optionsSection}>
+      <form class={style.optionsSection} onSubmit={preventDefault}>
         <Expander>
           {extendedSettings ?
             <label class={style.optionTextFirst}>

src/codecs/input-processors.ts

@@ -0,0 +1,9 @@
+import { defaultOptions as rotateDefaultOptions } from './rotate/processor-meta';
+
+export interface InputProcessorState {
+  rotate: import('./rotate/processor-meta').RotateOptions;
+}
+
+export const defaultInputProcessorState: InputProcessorState = {
+  rotate: rotateDefaultOptions,
+};

src/codecs/mozjpeg/options.tsx

@@ -1,6 +1,6 @@
 import { h, Component } from 'preact';
 import { bind } from '../../lib/initial-util';
-import { inputFieldChecked, inputFieldValueAsNumber } from '../../lib/util';
+import { inputFieldChecked, inputFieldValueAsNumber, preventDefault } from '../../lib/util';
 import { EncodeOptions, MozJpegColorSpace } from './encoder-meta';
 import * as style from '../../components/Options/style.scss';
 import Checkbox from '../../components/checkbox';
@@ -58,7 +58,7 @@ export default class MozJPEGEncoderOptions extends Component<Props, State> {
     // I'm rendering both lossy and lossless forms, as it becomes much easier when
     // gathering the data.
     return (
-      <form class={style.optionsSection}>
+      <form class={style.optionsSection} onSubmit={preventDefault}>
         <div class={style.optionOneCell}>
           <Range
             name="quality"

src/codecs/optipng/encoder-meta.ts

@@ -3,7 +3,7 @@ export interface EncodeOptions {
 }
 export interface EncoderState { type: typeof type; options: EncodeOptions; }
 
-export const type = 'png';
+export const type = 'optipng';
 export const label = 'OptiPNG';
 export const mimeType = 'image/png';
 export const extension = 'png';

src/codecs/optipng/options.tsx

@@ -1,6 +1,6 @@
 import { h, Component } from 'preact';
 import { bind } from '../../lib/initial-util';
-import { inputFieldValueAsNumber } from '../../lib/util';
+import { inputFieldValueAsNumber, preventDefault } from '../../lib/util';
 import { EncodeOptions } from './encoder-meta';
 import Range from '../../components/range';
 import * as style from '../../components/Options/style.scss';
@@ -23,7 +23,7 @@ export default class OptiPNGEncoderOptions extends Component<Props, {}> {
 
   render({ options }: Props) {
     return (
-      <form class={style.optionsSection}>
+      <form class={style.optionsSection} onSubmit={preventDefault}>
         <div class={style.optionOneCell}>
           <Range
             name="level"

src/codecs/oxipng/encoder-meta.ts

@@ -0,0 +1,13 @@
+export interface EncodeOptions {
+  level: number;
+}
+export interface EncoderState { type: typeof type; options: EncodeOptions; }
+
+export const type = 'oxipng';
+export const label = 'OxiPNG';
+export const mimeType = 'image/png';
+export const extension = 'png';
+
+export const defaultOptions: EncodeOptions = {
+  level: 6,
+};

src/codecs/oxipng/encoder.ts

@@ -0,0 +1,18 @@
+import * as oxipng from '../../../codecs/oxipng/pkg/oxipng_manual';
+import { EncodeOptions } from './encoder-meta';
+
+export async function compress(data: BufferSource, { level }: EncodeOptions): Promise<ArrayBuffer> {
+  let buffer: ArrayBuffer;
+
+  if (ArrayBuffer.isView(data)) {
+    buffer = data.buffer;
+  } else {
+    buffer = data;
+  }
+  debugger;
+  const resultView = await oxipng.compress(new Uint8Array(buffer), level);
+  const result = new Uint8Array(resultView);
+
+  // wasm can’t run on SharedArrayBuffers, so we hard-cast to ArrayBuffer.
+  return result.buffer as ArrayBuffer;
+}

src/codecs/oxipng/options.tsx

@@ -0,0 +1,42 @@
+import { h, Component } from 'preact';
+import { bind } from '../../lib/initial-util';
+import { inputFieldValueAsNumber, preventDefault } from '../../lib/util';
+import { EncodeOptions } from './encoder-meta';
+import Range from '../../components/range';
+import * as style from '../../components/Options/style.scss';
+
+type Props = {
+  options: EncodeOptions;
+  onChange(newOptions: EncodeOptions): void;
+};
+
+export default class OxiPNGEncoderOptions extends Component<Props, {}> {
+  @bind
+  onChange(event: Event) {
+    const form = (event.currentTarget as HTMLInputElement).closest('form') as HTMLFormElement;
+
+    const options: EncodeOptions = {
+      level: inputFieldValueAsNumber(form.level),
+    };
+    this.props.onChange(options);
+  }
+
+  render({ options }: Props) {
+    return (
+      <form class={style.optionsSection} onSubmit={preventDefault}>
+        <div class={style.optionOneCell}>
+          <Range
+            name="level"
+            min="0"
+            max="9"
+            step="1"
+            value={options.level}
+            onInput={this.onChange}
+          >
+            Effort:
+          </Range>
+        </div>
+      </form>
+    );
+  }
+}

src/codecs/processor-worker.ts

@@ -1,41 +0,0 @@
-import { expose } from 'comlink';
-import { EncodeOptions as MozJPEGEncoderOptions } from './mozjpeg/encoder-meta';
-import { QuantizeOptions } from './imagequant/processor-meta';
-import { EncodeOptions as OptiPNGEncoderOptions } from './optipng/encoder-meta';
-import { EncodeOptions as WebPEncoderOptions } from './webp/encoder-meta';
-
-async function mozjpegEncode(
-  data: ImageData, options: MozJPEGEncoderOptions,
-): Promise<ArrayBuffer> {
-  const { encode } = await import('./mozjpeg/encoder');
-  return encode(data, options);
-}
-
-async function quantize(data: ImageData, opts: QuantizeOptions): Promise<ImageData> {
-  const { process } = await import('./imagequant/processor');
-  return process(data, opts);
-}
-
-async function optiPngEncode(
-  data: BufferSource, options: OptiPNGEncoderOptions,
-): Promise<ArrayBuffer> {
-  const { compress } = await import('./optipng/encoder');
-  return compress(data, options);
-}
-
-async function webpEncode(
-  data: ImageData, options: WebPEncoderOptions,
-): Promise<ArrayBuffer> {
-  const { encode } = await import('./webp/encoder');
-  return encode(data, options);
-}
-
-async function webpDecode(data: ArrayBuffer): Promise<ImageData> {
-  const { decode } = await import('./webp/decoder');
-  return decode(data);
-}
-
-const exports = { mozjpegEncode, quantize, optiPngEncode, webpEncode, webpDecode };
-export type ProcessorWorkerApi = typeof exports;
-
-expose(exports, self);

src/codecs/processor-worker/index.ts

@@ -0,0 +1,83 @@
+import { expose } from 'comlink';
+
+async function mozjpegEncode(
+  data: ImageData, options: import('../mozjpeg/encoder-meta').EncodeOptions,
+): Promise<ArrayBuffer> {
+  const { encode } = await import(
+    /* webpackChunkName: "process-mozjpeg-enc" */
+    '../mozjpeg/encoder',
+  );
+  return encode(data, options);
+}
+
+async function quantize(
+  data: ImageData, opts: import('../imagequant/processor-meta').QuantizeOptions,
+): Promise<ImageData> {
+  const { process } = await import(
+    /* webpackChunkName: "process-imagequant" */
+    '../imagequant/processor',
+  );
+  return process(data, opts);
+}
+
+async function rotate(
+  data: ImageData, opts: import('../rotate/processor-meta').RotateOptions,
+): Promise<ImageData> {
+  const { rotate } = await import(
+    /* webpackChunkName: "process-rotate" */
+    '../rotate/processor',
+  );
+
+  return rotate(data, opts);
+}
+
+async function optiPngEncode(
+  data: BufferSource, options: import('../optipng/encoder-meta').EncodeOptions,
+): Promise<ArrayBuffer> {
+  const { compress } = await import(
+    /* webpackChunkName: "process-optipng" */
+    '../optipng/encoder',
+  );
+  return compress(data, options);
+}
+
+async function oxiPngEncode(
+  data: BufferSource, options: import('../oxipng/encoder-meta').EncodeOptions,
+): Promise<ArrayBuffer> {
+  const { compress } = await import(
+    /* webpackChunkName: "process-optipng" */
+    '../oxipng/encoder',
+  );
+  return compress(data, options);
+}
+
+async function webpEncode(
+  data: ImageData, options: import('../webp/encoder-meta').EncodeOptions,
+): Promise<ArrayBuffer> {
+  const { encode } = await import(
+    /* webpackChunkName: "process-webp-enc" */
+    '../webp/encoder',
+  );
+  return encode(data, options);
+}
+
+async function webpDecode(data: ArrayBuffer): Promise<ImageData> {
+  const { decode } = await import(
+    /* webpackChunkName: "process-webp-dec" */
+    '../webp/decoder',
+  );
+  return decode(data);
+}
+
+const exports = {
+  mozjpegEncode,
+  quantize,
+  rotate,
+  optiPngEncode,
+  oxiPngEncode,
+  webpEncode,
+  webpDecode,
+};
+export type ProcessorWorkerApi = typeof exports;
+
+expose(exports, self);

src/codecs/processor-worker/tsconfig.json

@@ -0,0 +1,18 @@
+{
+  "compileOnSave": false,
+  "compilerOptions": {
+    "strict": true,
+    "target": "esnext",
+    "module": "esnext",
+    "lib": [
+      "webworker",
+      "esnext"
+    ],
+    "moduleResolution": "node",
+    "experimentalDecorators": true,
+    "noUnusedLocals": true,
+    "sourceMap": true,
+    "allowJs": false,
+    "baseUrl": "."
+  }
+}

src/codecs/processor.ts

@@ -1,9 +1,9 @@
 import { proxy } from 'comlink';
 import { QuantizeOptions } from './imagequant/processor-meta';
-import { ProcessorWorkerApi } from './processor-worker';
 import { canvasEncode, blobToArrayBuffer } from '../lib/util';
 import { EncodeOptions as MozJPEGEncoderOptions } from './mozjpeg/encoder-meta';
 import { EncodeOptions as OptiPNGEncoderOptions } from './optipng/encoder-meta';
+import { EncodeOptions as OxiPNGEncoderOptions } from './oxipng/encoder-meta';
 import { EncodeOptions as WebPEncoderOptions } from './webp/encoder-meta';
 import { EncodeOptions as BrowserJPEGOptions } from './browser-jpeg/encoder-meta';
 import { EncodeOptions as BrowserWebpEncodeOptions } from './browser-webp/encoder-meta';
@@ -18,8 +18,10 @@ import * as browserTIFF from './browser-tiff/encoder';
 import * as browserJP2 from './browser-jp2/encoder';
 import * as browserPDF from './browser-pdf/encoder';
 
+type ProcessorWorkerApi = import('./processor-worker').ProcessorWorkerApi;
+
 /** How long the worker should be idle before terminating. */
-const workerTimeout = 1000;
+const workerTimeout = 10000;
 
 interface ProcessingJobOptions {
   needsWorker?: boolean;
@@ -61,7 +63,10 @@ export default class Processor {
           // worker-loader does magic here.
           // @ts-ignore - Typescript doesn't know about the 2nd param to new Worker, and the
           // definition can't be overwritten.
-          this._worker = new Worker('./processor-worker.ts', { type: 'module' }) as Worker;
+          this._worker = new Worker(
+            './processor-worker',
+            { name: 'processor-worker', type: 'module' },
+          ) as Worker;
           // Need to do some TypeScript trickery to make the type match.
           this._workerApi = proxy(this._worker) as any as ProcessorWorkerApi;
         }
@@ -114,12 +119,18 @@ export default class Processor {
   }
 
   // Off main thread jobs:
-
   @Processor._processingJob({ needsWorker: true })
   imageQuant(data: ImageData, opts: QuantizeOptions): Promise<ImageData> {
     return this._workerApi!.quantize(data, opts);
   }
 
+  @Processor._processingJob({ needsWorker: true })
+  rotate(
+    data: ImageData, opts: import('./rotate/processor-meta').RotateOptions,
+  ): Promise<ImageData> {
+    return this._workerApi!.rotate(data, opts);
+  }
+
   @Processor._processingJob({ needsWorker: true })
   mozjpegEncode(
     data: ImageData, opts: MozJPEGEncoderOptions,
@@ -137,6 +148,16 @@ export default class Processor {
     return this._workerApi!.optiPngEncode(pngBuffer, opts);
   }
 
+  @Processor._processingJob({ needsWorker: true })
+  async oxiPngEncode(
+    data: ImageData, opts: OxiPNGEncoderOptions,
+  ): Promise<ArrayBuffer> {
+    // OptiPNG expects PNG input.
+    const pngBlob = await canvasEncode(data, 'image/png');
+    const pngBuffer = await blobToArrayBuffer(pngBlob);
+    return this._workerApi!.oxiPngEncode(pngBuffer, opts);
+  }
+
   @Processor._processingJob({ needsWorker: true })
   webpEncode(data: ImageData, opts: WebPEncoderOptions): Promise<ArrayBuffer> {
     return this._workerApi!.webpEncode(data, opts);

src/codecs/resize/options.tsx

@@ -1,7 +1,7 @@
 import { h, Component } from 'preact';
 import linkState from 'linkstate';
 import { bind, linkRef } from '../../lib/initial-util';
-import { inputFieldValueAsNumber, inputFieldValue } from '../../lib/util';
+import { inputFieldValueAsNumber, inputFieldValue, preventDefault } from '../../lib/util';
 import { ResizeOptions } from './processor-meta';
 import * as style from '../../components/Options/style.scss';
 import Checkbox from '../../components/checkbox';
@@ -78,7 +78,7 @@ export default class ResizerOptions extends Component<Props, State> {
 
   render({ options, isVector }: Props, { maintainAspect }: State) {
     return (
-      <form ref={linkRef(this, 'form')} class={style.optionsSection}>
+      <form ref={linkRef(this, 'form')} class={style.optionsSection} onSubmit={preventDefault}>
         <label class={style.optionTextFirst}>
           Method:
           <Select
@@ -135,7 +135,7 @@ export default class ResizerOptions extends Component<Props, State> {
                 onChange={this.onChange}
               >
                 <option value="stretch">Stretch</option>
-                <option value="cover">Cover</option>
+                <option value="contain">Contain</option>
               </Select>
             </label>
           }

src/codecs/resize/processor-meta.ts

@@ -4,7 +4,7 @@ export interface ResizeOptions {
   width: number;
   height: number;
   method: 'vector' | BitmapResizeMethods;
-  fitMethod: 'stretch' | 'cover';
+  fitMethod: 'stretch' | 'contain';
 }
 
 export interface BitmapResizeOptions extends ResizeOptions {

src/codecs/resize/processor.ts

@@ -1,7 +1,7 @@
 import { nativeResize, NativeResizeMethod, drawableToImageData } from '../../lib/util';
 import { BitmapResizeOptions, VectorResizeOptions } from './processor-meta';
 
-function getCoverOffsets(sw: number, sh: number, dw: number, dh: number) {
+function getContainOffsets(sw: number, sh: number, dw: number, dh: number) {
   const currentAspect = sw / sh;
   const endAspect = dw / dh;
 
@@ -22,8 +22,8 @@ export function resize(data: ImageData, opts: BitmapResizeOptions): ImageData {
   let sw = data.width;
   let sh = data.height;
 
-  if (opts.fitMethod === 'cover') {
-    ({ sx, sy, sw, sh } = getCoverOffsets(sw, sh, opts.width, opts.height));
+  if (opts.fitMethod === 'contain') {
+    ({ sx, sy, sw, sh } = getContainOffsets(sw, sh, opts.width, opts.height));
   }
 
   return nativeResize(
@@ -38,8 +38,8 @@ export function vectorResize(data: HTMLImageElement, opts: VectorResizeOptions):
   let sw = data.width;
   let sh = data.height;
 
-  if (opts.fitMethod === 'cover') {
-    ({ sx, sy, sw, sh } = getCoverOffsets(sw, sh, opts.width, opts.height));
+  if (opts.fitMethod === 'contain') {
+    ({ sx, sy, sw, sh } = getContainOffsets(sw, sh, opts.width, opts.height));
   }
 
   return drawableToImageData(data, {

src/codecs/rotate/processor-meta.ts

@@ -0,0 +1,5 @@
+export interface RotateOptions {
+  rotate: 0 | 90 | 180 | 270;
+}
+
+export const defaultOptions: RotateOptions = { rotate: 0 };

src/codecs/rotate/processor.ts

@@ -0,0 +1,73 @@
+import { RotateOptions } from './processor-meta';
+
+export function rotate(data: ImageData, opts: RotateOptions): ImageData {
+  const { rotate } = opts;
+  const flipDimensions = rotate % 180 !== 0;
+  const { width: inputWidth, height: inputHeight } = data;
+  const outputWidth = flipDimensions ? inputHeight : inputWidth;
+  const outputHeight = flipDimensions ? inputWidth : inputHeight;
+  const out = new ImageData(outputWidth, outputHeight);
+  let i = 0;
+
+  // In the straight-copy case, d1 is x, d2 is y.
+  // x starts at 0 and increases.
+  // y starts at 0 and increases.
+  let d1Start = 0;
+  let d1Limit = inputWidth;
+  let d1Advance = 1;
+  let d1Multiplier = 1;
+  let d2Start = 0;
+  let d2Limit = inputHeight;
+  let d2Advance = 1;
+  let d2Multiplier = inputWidth;
+
+  if (rotate === 90) {
+    // d1 is y, d2 is x.
+    // y starts at its max value and decreases.
+    // x starts at 0 and increases.
+    d1Start = inputHeight - 1;
+    d1Limit = inputHeight;
+    d1Advance = -1;
+    d1Multiplier = inputWidth;
+    d2Start = 0;
+    d2Limit = inputWidth;
+    d2Advance = 1;
+    d2Multiplier = 1;
+  } else if (rotate === 180) {
+    // d1 is x, d2 is y.
+    // x starts at its max and decreases.
+    // y starts at its max and decreases.
+    d1Start = inputWidth - 1;
+    d1Limit = inputWidth;
+    d1Advance = -1;
+    d1Multiplier = 1;
+    d2Start = inputHeight - 1;
+    d2Limit = inputHeight;
+    d2Advance = -1;
+    d2Multiplier = inputWidth;
+  } else if (rotate === 270) {
+    // d1 is y, d2 is x.
+    // y starts at 0 and increases.
+    // x starts at its max and decreases.
+    d1Start = 0;
+    d1Limit = inputHeight;
+    d1Advance = 1;
+    d1Multiplier = inputWidth;
+    d2Start = inputWidth - 1;
+    d2Limit = inputWidth;
+    d2Advance = -1;
+    d2Multiplier = 1;
+  }
+
+  const inB = new Uint32Array(data.data.buffer);
+  const outB = new Uint32Array(out.data.buffer);
+  for (let d2 = d2Start; d2 >= 0 && d2 < d2Limit; d2 += d2Advance) {
+    for (let d1 = d1Start; d1 >= 0 && d1 < d1Limit; d1 += d1Advance) {
+      const start = ((d1 * d1Multiplier) + (d2 * d2Multiplier));
+      outB[i] = inB[start];
+      i += 1;
+    }
+  }
+
+  return out;
+}

src/codecs/webp/options.tsx

@@ -1,6 +1,6 @@
 import { h, Component } from 'preact';
 import { bind } from '../../lib/initial-util';
-import { inputFieldCheckedAsNumber, inputFieldValueAsNumber } from '../../lib/util';
+import { inputFieldCheckedAsNumber, inputFieldValueAsNumber, preventDefault } from '../../lib/util';
 import { EncodeOptions, WebPImageHint } from './encoder-meta';
 import * as style from '../../components/Options/style.scss';
 import Checkbox from '../../components/checkbox';
@@ -319,7 +319,7 @@ export default class WebPEncoderOptions extends Component<Props, State> {
     // I'm rendering both lossy and lossless forms, as it becomes much easier when
     // gathering the data.
     return (
-      <form class={style.optionsSection}>
+      <form class={style.optionsSection} onSubmit={preventDefault}>
         <label class={style.optionInputFirst}>
           <Checkbox
             name="lossless"

src/components/App/index.tsx

@@ -9,24 +9,32 @@ import '../../lib/SnackBar';
 import Intro from '../intro';
 import '../custom-els/LoadingSpinner';
 
-// This is imported for TypeScript only. It isn't used.
-import Compress from '../compress';
+const ROUTE_EDITOR = '/editor';
 
-export interface SourceImage {
-  file: File | Fileish;
-  data: ImageData;
-  vectorImage?: HTMLImageElement;
+const compressPromise = import(
+  /* webpackChunkName: "main-app" */
+  '../compress',
+);
+const offlinerPromise = import(
+  /* webpackChunkName: "offliner" */
+  '../../lib/offliner',
+);
+
+function back() {
+  window.history.back();
 }
 
 interface Props {}
 
 interface State {
   file?: File | Fileish;
-  Compress?: typeof Compress;
+  isEditorOpen: Boolean;
+  Compress?: typeof import('../compress').default;
 }
 
 export default class App extends Component<Props, State> {
   state: State = {
+    isEditorOpen: false,
     file: undefined,
     Compress: undefined,
   };
@@ -36,32 +44,45 @@ export default class App extends Component<Props, State> {
   constructor() {
     super();
 
-    import('../compress').then((module) => {
+    compressPromise.then((module) => {
       this.setState({ Compress: module.default });
     }).catch(() => {
       this.showSnack('Failed to load app');
     });
 
+    offlinerPromise.then(({ offliner }) => offliner(this.showSnack));
+
     // In development, persist application state across hot reloads:
     if (process.env.NODE_ENV === 'development') {
       this.setState(window.STATE);
       const oldCDU = this.componentDidUpdate;
-      this.componentDidUpdate = (props, state) => {
-        if (oldCDU) oldCDU.call(this, props, state);
+      this.componentDidUpdate = (props, state, prev) => {
+        if (oldCDU) oldCDU.call(this, props, state, prev);
         window.STATE = this.state;
       };
     }
+
+    // Since iOS 10, Apple tries to prevent disabling pinch-zoom. This is great in theory, but
+    // really breaks things on Squoosh, as you can easily end up zooming the UI when you mean to
+    // zoom the image. Once you've done this, it's really difficult to undo. Anyway, this seems to
+    // prevent it.
+    document.body.addEventListener('gesturestart', (event) => {
+      event.preventDefault();
+    });
+
+    window.addEventListener('popstate', this.onPopState);
   }
 
   @bind
-  private onFileDrop(event: FileDropEvent) {
-    const { file } = event;
+  private onFileDrop({ file }: FileDropEvent) {
     if (!file) return;
+    this.openEditor();
     this.setState({ file });
   }
 
   @bind
   private onIntroPickFile(file: File | Fileish) {
+    this.openEditor();
     this.setState({ file });
   }
 
@@ -71,14 +92,26 @@ export default class App extends Component<Props, State> {
     return this.snackbar.showSnackbar(message, options);
   }
 
-  render({}: Props, { file, Compress }: State) {
+  @bind
+  private onPopState() {
+    this.setState({ isEditorOpen: location.pathname === ROUTE_EDITOR });
+  }
+
+  @bind
+  private openEditor() {
+    if (this.state.isEditorOpen) return;
+    history.pushState(null, '', ROUTE_EDITOR);
+    this.setState({ isEditorOpen: true });
+  }
+
+  render({}: Props, { file, isEditorOpen, Compress }: State) {
     return (
       <div id="app" class={style.app}>
         <file-drop accept="image/*" onfiledrop={this.onFileDrop} class={style.drop}>
-          {(!file)
+          {!isEditorOpen
             ? <Intro onFile={this.onIntroPickFile} showSnack={this.showSnack} />
             : (Compress)
-              ? <Compress file={file} showSnack={this.showSnack} />
+              ? <Compress file={file!} showSnack={this.showSnack} onBack={back} />
               : <loading-spinner class={style.appLoader}/>
           }
           <snack-bar ref={linkRef(this, 'snackbar')} />

src/components/Options/index.tsx

@@ -35,12 +35,14 @@ import {
 import { QuantizeOptions } from '../../codecs/imagequant/processor-meta';
 import { ResizeOptions } from '../../codecs/resize/processor-meta';
 import { PreprocessorState } from '../../codecs/preprocessors';
-import { SourceImage } from '../App';
+import { SourceImage } from '../compress';
 import Checkbox from '../checkbox';
 import Expander from '../expander';
 import Select from '../select';
 
-const encoderOptionsComponentMap = {
+const encoderOptionsComponentMap: {
+  [x: string]: (new (...args: any[]) => Component<any, any>) | undefined;
+} = {
   [identity.type]: undefined,
   [optiPNG.type]: OptiPNGEncoderOptions,
   [mozJPEG.type]: MozJpegEncoderOptions,
@@ -81,7 +83,7 @@ export default class Options extends Component<Props, State> {
   }
 
   @bind
-  onEncoderTypeChange(event: Event) {
+  private onEncoderTypeChange(event: Event) {
     const el = event.currentTarget as HTMLSelectElement;
 
     // The select element only has values matching encoder types,
@@ -91,7 +93,7 @@ export default class Options extends Component<Props, State> {
   }
 
   @bind
-  onPreprocessorEnabledChange(event: Event) {
+  private onPreprocessorEnabledChange(event: Event) {
     const el = event.currentTarget as HTMLInputElement;
     const preprocessor = el.name.split('.')[0] as keyof PreprocessorState;
 
@@ -101,14 +103,14 @@ export default class Options extends Component<Props, State> {
   }
 
   @bind
-  onQuantizerOptionsChange(opts: QuantizeOptions) {
+  private onQuantizerOptionsChange(opts: QuantizeOptions) {
     this.props.onPreprocessorOptionsChange(
       cleanMerge(this.props.preprocessorState, 'quantizer', opts),
     );
   }
 
   @bind
-  onResizeOptionsChange(opts: ResizeOptions) {
+  private onResizeOptionsChange(opts: ResizeOptions) {
     this.props.onPreprocessorOptionsChange(
       cleanMerge(this.props.preprocessorState, 'resize', opts),
     );
@@ -144,7 +146,7 @@ export default class Options extends Component<Props, State> {
                 {preprocessorState.resize.enabled ?
                   <ResizeOptionsComponent
                     isVector={Boolean(source && source.vectorImage)}
-                    aspect={source ? (source.data.width / source.data.height) : 1}
+                    aspect={source ? source.processed.width / source.processed.height : 1}
                     options={preprocessorState.resize}
                     onChange={this.onResizeOptionsChange}
                   />

src/components/Options/style.scss

@@ -43,6 +43,7 @@ $horizontalPadding: 15px;
 
 .text-field {
   background: #fff;
+  color: #000;
   font: inherit;
   border: none;
   padding: 2px 0 2px 10px;
@@ -54,4 +55,5 @@ $horizontalPadding: 15px;
 .options-scroller {
   overflow-x: hidden;
   overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
 }

src/components/Output/custom-els/PinchZoom/index.ts

@@ -1,5 +1,5 @@
+import PointerTracker, { Pointer } from 'pointer-tracker';
 import './styles.css';
-import { PointerTracker, Pointer } from '../../../../lib/PointerTracker';
 
 interface Point {
   clientX: number;
@@ -242,7 +242,7 @@ export default class PinchZoom extends HTMLElement {
   /**
    * Update transform values without checking bounds. This is only called in setTransform.
    */
-  _updateTransform(scale: number, x: number, y: number, allowChangeEvent: boolean) {
+  private _updateTransform(scale: number, x: number, y: number, allowChangeEvent: boolean) {
     // Avoid scaling to zero
     if (scale < MIN_SCALE) return;
 

src/components/Output/custom-els/TwoUp/index.ts

@@ -1,5 +1,5 @@
+import PointerTracker, { Pointer } from 'pointer-tracker';
 import * as styles from './styles.css';
-import { PointerTracker, Pointer } from '../../../../lib/PointerTracker';
 
 const legacyClipCompatAttr = 'legacy-clip-compat';
 const orientationAttr = 'orientation';
@@ -70,12 +70,13 @@ export default class TwoUp extends HTMLElement {
   connectedCallback() {
     this._childrenChange();
 
+    this._handle.innerHTML = `<div class="${styles.scrubber}">${
+      `<svg viewBox="0 0 27 20" fill="currentColor">${
+        '<path d="M17 19.2l9.5-9.6L16.9 0zM9.6 0L0 9.6l9.6 9.6z"/>'
+      }</svg>`
+    }</div>`;
+
     if (!this._everConnected) {
-      this._handle.innerHTML = `<div class="${styles.scrubber}">${
-        `<svg viewBox="0 0 27 20" fill="currentColor">${
-          '<path d="M17 19.2l9.5-9.6L16.9 0zM9.6 0L0 9.6l9.6 9.6z"/>'
-        }</svg>`
-      }</div>`;
       this._resetPosition();
       this._everConnected = true;
     }

src/components/Output/index.tsx

@@ -5,16 +5,29 @@ import './custom-els/TwoUp';
 import * as style from './style.scss';
 import { bind, linkRef } from '../../lib/initial-util';
 import { shallowEqual, drawDataToCanvas } from '../../lib/util';
-import { ToggleIcon, AddIcon, RemoveIcon } from '../../lib/icons';
+import {
+    ToggleBackgroundIcon,
+    AddIcon,
+    RemoveIcon,
+    BackIcon,
+    ToggleBackgroundActiveIcon,
+    RotateIcon,
+} from '../../lib/icons';
 import { twoUpHandle } from './custom-els/TwoUp/styles.css';
+import { InputProcessorState } from '../../codecs/input-processors';
+import { cleanSet } from '../../lib/clean-modify';
+import { SourceImage } from '../compress';
 
 interface Props {
-  originalImage?: ImageData;
+  source?: SourceImage;
+  inputProcessorState?: InputProcessorState;
   mobileView: boolean;
   leftCompressed?: ImageData;
   rightCompressed?: ImageData;
   leftImgContain: boolean;
   rightImgContain: boolean;
+  onBack: () => void;
+  onInputProcessorChange: (newState: InputProcessorState) => void;
 }
 
 interface State {
@@ -47,6 +60,15 @@ export default class Output extends Component<Props, State> {
     const leftDraw = this.leftDrawable();
     const rightDraw = this.rightDrawable();
 
+    // Reset the pinch zoom, which may have an position set from the previous view, after pressing
+    // the back button.
+    this.pinchZoomLeft!.setTransform({
+      allowChangeEvent: true,
+      x: 0,
+      y: 0,
+      scale: 1,
+    });
+
     if (this.canvasLeft && leftDraw) {
       drawDataToCanvas(this.canvasLeft, leftDraw);
     }
@@ -60,6 +82,38 @@ export default class Output extends Component<Props, State> {
     const prevRightDraw = this.rightDrawable(prevProps);
     const leftDraw = this.leftDrawable();
     const rightDraw = this.rightDrawable();
+    const sourceFileChanged =
+      // Has the value become (un)defined?
+      (!!this.props.source !== !!prevProps.source) ||
+      // Or has the file changed?
+      (this.props.source && prevProps.source && this.props.source.file !== prevProps.source.file);
+
+    const oldSourceData = prevProps.source && prevProps.source.processed;
+    const newSourceData = this.props.source && this.props.source.processed;
+    const pinchZoom = this.pinchZoomLeft!;
+
+    if (sourceFileChanged) {
+      // New image? Reset the pinch-zoom.
+      pinchZoom.setTransform({
+        allowChangeEvent: true,
+        x: 0,
+        y: 0,
+        scale: 1,
+      });
+    } else if (oldSourceData && newSourceData && oldSourceData !== newSourceData) {
+      // Since the pinch zoom transform origin is the top-left of the content, we need to flip
+      // things around a bit when the content size changes, so the new content appears as if it were
+      // central to the previous content.
+      const scaleChange = 1 - pinchZoom.scale;
+      const oldXScaleOffset = oldSourceData.width / 2 * scaleChange;
+      const oldYScaleOffset = oldSourceData.height / 2 * scaleChange;
+
+      pinchZoom.setTransform({
+        allowChangeEvent: true,
+        x: pinchZoom.x - oldXScaleOffset + oldYScaleOffset,
+        y: pinchZoom.y - oldYScaleOffset + oldXScaleOffset,
+      });
+    }
 
     if (leftDraw && leftDraw !== prevLeftDraw && this.canvasLeft) {
       drawDataToCanvas(this.canvasLeft, leftDraw);
@@ -67,16 +121,6 @@ export default class Output extends Component<Props, State> {
     if (rightDraw && rightDraw !== prevRightDraw && this.canvasRight) {
       drawDataToCanvas(this.canvasRight, rightDraw);
     }
-
-    if (this.props.originalImage !== prevProps.originalImage && this.pinchZoomLeft) {
-      // New image? Reset the pinch-zoom.
-      this.pinchZoomLeft.setTransform({
-        allowChangeEvent: true,
-        x: 0,
-        y: 0,
-        scale: 1,
-      });
-    }
   }
 
   shouldComponentUpdate(nextProps: Props, nextState: State) {
@@ -84,11 +128,11 @@ export default class Output extends Component<Props, State> {
   }
 
   private leftDrawable(props: Props = this.props): ImageData | undefined {
-    return props.leftCompressed || props.originalImage;
+    return props.leftCompressed || (props.source && props.source.processed);
   }
 
   private rightDrawable(props: Props = this.props): ImageData | undefined {
-    return props.rightCompressed || props.originalImage;
+    return props.rightCompressed || (props.source && props.source.processed);
   }
 
   @bind
@@ -112,6 +156,20 @@ export default class Output extends Component<Props, State> {
     this.pinchZoomLeft.scaleTo(this.state.scale / 1.25, scaleToOpts);
   }
 
+  @bind
+  private onRotateClick() {
+    const { inputProcessorState } = this.props;
+    if (!inputProcessorState) return;
+
+    const newState = cleanSet(
+      inputProcessorState,
+      'rotate.rotate',
+      (inputProcessorState.rotate.rotate + 90) % 360,
+    );
+
+    this.props.onInputProcessorChange(newState);
+  }
+
   @bind
   private onScaleValueFocus() {
     this.setState({ editingScale: true }, () => {
@@ -177,14 +235,27 @@ export default class Output extends Component<Props, State> {
     const clonedEvent = new (event.constructor as typeof Event)(event.type, event);
     this.retargetedEvents.add(clonedEvent);
     this.pinchZoomLeft.dispatchEvent(clonedEvent);
+
+    // Unfocus any active element on touchend. This fixes an issue on (at least) Android Chrome,
+    // where the software keyboard is hidden, but the input remains focused, then after interaction
+    // with this element the keyboard reappears for NO GOOD REASON. Thanks Android.
+    if (
+      event.type === 'touchend' &&
+      document.activeElement &&
+      document.activeElement instanceof HTMLElement
+    ) {
+      document.activeElement.blur();
+    }
   }
 
   render(
-    { mobileView, leftImgContain, rightImgContain, originalImage }: Props,
+    { mobileView, leftImgContain, rightImgContain, source, onBack }: Props,
     { scale, editingScale, altBackground }: State,
   ) {
     const leftDraw = this.leftDrawable();
     const rightDraw = this.rightDrawable();
+    // To keep position stable, the output is put in a square using the longest dimension.
+    const originalImage = source && source.processed;
 
     return (
       <div class={`${style.output} ${altBackground ? style.altBackground : ''}`}>
@@ -206,7 +277,7 @@ export default class Output extends Component<Props, State> {
             ref={linkRef(this, 'pinchZoomLeft')}
           >
             <canvas
-              class={style.outputCanvas}
+              class={style.pinchTarget}
               ref={linkRef(this, 'canvasLeft')}
               width={leftDraw && leftDraw.width}
               height={leftDraw && leftDraw.height}
@@ -219,7 +290,7 @@ export default class Output extends Component<Props, State> {
           </pinch-zoom>
           <pinch-zoom class={style.pinchZoom} ref={linkRef(this, 'pinchZoomRight')}>
             <canvas
-              class={style.outputCanvas}
+              class={style.pinchTarget}
               ref={linkRef(this, 'canvasRight')}
               width={rightDraw && rightDraw.width}
               height={rightDraw && rightDraw.height}
@@ -232,6 +303,12 @@ export default class Output extends Component<Props, State> {
           </pinch-zoom>
         </two-up>
 
+        <div class={style.back}>
+          <button class={style.button} onClick={onBack}>
+            <BackIcon />
+          </button>
+        </div>
+
         <div class={style.controls}>
           <div class={style.zoomControls}>
             <button class={style.button} onClick={this.zoomOut}>
@@ -259,10 +336,21 @@ export default class Output extends Component<Props, State> {
               <AddIcon />
             </button>
           </div>
-          <button class={style.button} onClick={this.toggleBackground}>
-            <ToggleIcon />
-            Toggle Background
-          </button>
+          <div class={style.buttonsNoWrap}>
+            <button class={style.button} onClick={this.onRotateClick} title="Rotate image">
+              <RotateIcon />
+            </button>
+            <button
+              class={`${style.button} ${altBackground ? style.active : ''}`}
+              onClick={this.toggleBackground}
+              title="Change canvas color"
+            >
+              {altBackground
+                ? <ToggleBackgroundActiveIcon />
+                : <ToggleBackgroundIcon />
+              }
+            </button>
+          </div>
         </div>
       </div>
     );

src/components/Output/style.scss

@@ -31,6 +31,15 @@
   align-items: center;
 }
 
+.pinch-target {
+  // This fixes a severe painting bug in Chrome.
+  // We should try to remove this once the issue is fixed.
+  // https://bugs.chromium.org/p/chromium/issues/detail?id=870222#c10
+  will-change: auto;
+  // Prevent the image becoming misshapen due to default flexbox layout.
+  flex-shrink: 0;
+}
+
 .controls {
   position: absolute;
   display: flex;
@@ -38,7 +47,7 @@
   top: 0;
   left: 0;
   right: 0;
-  padding: 9px;
+  padding: 9px 84px;
   overflow: hidden;
   flex-wrap: wrap;
   contain: content;
@@ -50,10 +59,12 @@
   }
 
   @media (min-width: 860px) {
+    padding: 9px;
     top: auto;
     left: 320px;
     right: 320px;
     bottom: 0;
+    flex-wrap: wrap-reverse;
   }
 }
 
@@ -78,14 +89,20 @@
   display: flex;
   align-items: center;
   box-sizing: border-box;
-  height: 48px;
-  padding: 0 16px;
   margin: 4px;
   background-color: #fff;
   border: 1px solid rgba(0,0,0,0.2);
   border-radius: 5px;
   line-height: 1;
   white-space: nowrap;
+  height: 36px;
+  padding: 0 8px;
+  cursor: pointer;
+
+  @media (min-width: 600px) {
+    height: 48px;
+    padding: 0 16px;
+  }
 
   &:focus {
     box-shadow: 0 0 0 2px var(--button-fg);
@@ -95,15 +112,20 @@
 }
 
 .button {
-  text-transform: uppercase;
   color: var(--button-fg);
-  cursor: pointer;
-  text-indent: 6px;
-  font-size: 110%;
 
   &:hover {
     background-color: #eee;
   }
+
+  &.active {
+    background: #34B9EB;
+    color: #fff;
+
+    &:hover {
+      background: #32a3ce;
+    }
+  }
 }
 
 .zoom {
@@ -127,10 +149,18 @@
   border-bottom: 1px dashed #999;
 }
 
-.output-canvas {
-  flex-shrink: 0;
-  // This fixes a severe painting bug in Chrome.
-  // We should try to remove this once the issue is fixed.
-  // https://bugs.chromium.org/p/chromium/issues/detail?id=870222#c10
-  will-change: auto;
+.back {
+  position: absolute;
+  top: 0;
+  left: 0;
+  padding: 9px;
+}
+
+.buttons-no-wrap {
+  display: flex;
+  pointer-events: none;
+
+  & > * {
+    pointer-events: auto;
+  }
 }

src/components/compress/custom-els/MultiPanel/index.ts

@@ -103,7 +103,7 @@ export default class MultiPanel extends HTMLElement {
 
   // KeyDown event handler
   private _onKeyDown(event: KeyboardEvent) {
-    const selectedEl = document.activeElement;
+    const selectedEl = document.activeElement!;
     const heading = getClosestHeading(selectedEl);
 
     // if keydown event is not on heading element, ignore
@@ -252,8 +252,8 @@ export default class MultiPanel extends HTMLElement {
       return this.firstElementChild as HTMLElement;
     }
     // previous Element of active Element is previous Content,
-    // previous Element of previous Content  is previousHeading
-    const previousContent = document.activeElement.previousElementSibling;
+    // previous Element of previous Content is previousHeading
+    const previousContent = document.activeElement!.previousElementSibling;
     if (previousContent) {
       return previousContent.previousElementSibling as HTMLElement;
     }
@@ -263,7 +263,7 @@ export default class MultiPanel extends HTMLElement {
   private _nextHeading() {
     // activeElement would be the currently selected heading
     // 2 elemements after that would be the next heading.
-    const nextContent = document.activeElement.nextElementSibling;
+    const nextContent = document.activeElement!.nextElementSibling;
     if (nextContent) {
       return nextContent.nextElementSibling as HTMLElement;
     }

src/components/compress/index.tsx

@@ -8,6 +8,7 @@ import Options from '../Options';
 import ResultCache from './result-cache';
 import * as identity from '../../codecs/identity/encoder-meta';
 import * as optiPNG from '../../codecs/optipng/encoder-meta';
+import * as oxiPNG from '../../codecs/oxipng/encoder-meta';
 import * as mozJPEG from '../../codecs/mozjpeg/encoder-meta';
 import * as webP from '../../codecs/webp/encoder-meta';
 import * as browserPNG from '../../codecs/browser-png/encoder-meta';
@@ -35,21 +36,29 @@ import { VectorResizeOptions, BitmapResizeOptions } from '../../codecs/resize/pr
 import './custom-els/MultiPanel';
 import Results from '../results';
 import { ExpandIcon, CopyAcrossIconProps } from '../../lib/icons';
-import SnackBarElement from 'src/lib/SnackBar';
+import SnackBarElement from '../../lib/SnackBar';
+import { InputProcessorState, defaultInputProcessorState } from '../../codecs/input-processors';
 
 export interface SourceImage {
   file: File | Fileish;
-  data: ImageData;
+  decoded: ImageData;
+  processed: ImageData;
   vectorImage?: HTMLImageElement;
+  inputProcessorState: InputProcessorState;
 }
 
-interface EncodedImage {
+interface SideSettings {
+  preprocessorState: PreprocessorState;
+  encoderState: EncoderState;
+}
+
+interface Side {
   preprocessed?: ImageData;
   file?: Fileish;
   downloadUrl?: string;
   data?: ImageData;
-  preprocessorState: PreprocessorState;
-  encoderState: EncoderState;
+  latestSettings: SideSettings;
+  encodedSettings?: SideSettings;
   loading: boolean;
   /** Counter of the latest bmp currently encoding */
   loadingCounter: number;
@@ -60,11 +69,12 @@ interface EncodedImage {
 interface Props {
   file: File | Fileish;
   showSnack: SnackBarElement['showSnackbar'];
+  onBack: () => void;
 }
 
 interface State {
   source?: SourceImage;
-  images: [EncodedImage, EncodedImage];
+  sides: [Side, Side];
   /** Source image load */
   loading: boolean;
   loadingCounter: number;
@@ -76,12 +86,27 @@ interface UpdateImageOptions {
   skipPreprocessing?: boolean;
 }
 
+async function processInput(
+  data: ImageData,
+  inputProcessData: InputProcessorState,
+  processor: Processor,
+) {
+  let processedData = data;
+
+  if (inputProcessData.rotate.rotate !== 0) {
+    processedData = await processor.rotate(processedData, inputProcessData.rotate);
+  }
+
+  return processedData;
+}
+
 async function preprocessImage(
   source: SourceImage,
   preprocessData: PreprocessorState,
   processor: Processor,
 ): Promise<ImageData> {
-  let result = source.data;
+  let result = source.processed;
+
   if (preprocessData.resize.enabled) {
     if (preprocessData.resize.method === 'vector' && source.vectorImage) {
       result = processor.vectorResize(
@@ -107,6 +132,7 @@ async function compressImage(
   const compressedData = await (() => {
     switch (encodeData.type) {
       case optiPNG.type: return processor.optiPngEncode(image, encodeData.options);
+      case oxiPNG.type: return processor.oxiPngEncode(image, encodeData.options);
       case mozJPEG.type: return processor.mozjpegEncode(image, encodeData.options);
       case webP.type: return processor.webpEncode(image, encodeData.options);
       case browserPNG.type: return processor.browserPngEncode(image);
@@ -130,6 +156,26 @@ async function compressImage(
   );
 }
 
+function stateForNewSourceData(state: State, newSource: SourceImage): State {
+  let newState = { ...state };
+
+  for (const i of [0, 1]) {
+    // Ditch previous encodings
+    const downloadUrl = state.sides[i].downloadUrl;
+    if (downloadUrl) URL.revokeObjectURL(downloadUrl);
+
+    newState = cleanMerge(state, `sides.${i}`, {
+      preprocessed: undefined,
+      file: undefined,
+      downloadUrl: undefined,
+      data: undefined,
+      encodedSettings: undefined,
+    });
+  }
+
+  return newState;
+}
+
 async function processSvg(blob: Blob): Promise<HTMLImageElement> {
   // Firefox throws if you try to draw an SVG to canvas that doesn't have width/height.
   // In Chrome it loads, but drawImage behaves weirdly.
@@ -161,6 +207,8 @@ const resultTitles = ['Top', 'Bottom'];
 const buttonPositions =
   ['download-left', 'download-right'] as ('download-left' | 'download-right')[];
 
+const originalDocumentTitle = document.title;
+
 export default class Compress extends Component<Props, State> {
   widthQuery = window.matchMedia('(max-width: 599px)');
 
@@ -168,17 +216,21 @@ export default class Compress extends Component<Props, State> {
     source: undefined,
     loading: false,
     loadingCounter: 0,
-    images: [
+    sides: [
       {
-        preprocessorState: defaultPreprocessorState,
-        encoderState: { type: identity.type, options: identity.defaultOptions },
+        latestSettings: {
+          preprocessorState: defaultPreprocessorState,
+          encoderState: { type: identity.type, options: identity.defaultOptions },
+        },
         loadingCounter: 0,
         loadedCounter: 0,
         loading: false,
       },
       {
-        preprocessorState: defaultPreprocessorState,
-        encoderState: { type: mozJPEG.type, options: mozJPEG.defaultOptions },
+        latestSettings: {
+          preprocessorState: defaultPreprocessorState,
+          encoderState: { type: mozJPEG.type, options: mozJPEG.defaultOptions },
+        },
         loadingCounter: 0,
         loadedCounter: 0,
         loading: false,
@@ -190,11 +242,15 @@ export default class Compress extends Component<Props, State> {
   private readonly encodeCache = new ResultCache();
   private readonly leftProcessor = new Processor();
   private readonly rightProcessor = new Processor();
+  // For debouncing calls to updateImage for each side.
+  private readonly updateImageTimeoutIds: [number?, number?] = [undefined, undefined];
 
   constructor(props: Props) {
     super(props);
     this.widthQuery.addListener(this.onMobileWidthChange);
     this.updateFile(props.file);
+
+    import('../../lib/offliner').then(({ mainAppLoaded }) => mainAppLoaded());
   }
 
   @bind
@@ -204,7 +260,7 @@ export default class Compress extends Component<Props, State> {
 
   private onEncoderTypeChange(index: 0 | 1, newType: EncoderType): void {
     this.setState({
-      images: cleanSet(this.state.images, `${index}.encoderState`, {
+      sides: cleanSet(this.state.sides, `${index}.latestSettings.encoderState`, {
         type: newType,
         options: encoderMap[newType].defaultOptions,
       }),
@@ -213,39 +269,50 @@ export default class Compress extends Component<Props, State> {
 
   private onPreprocessorOptionsChange(index: 0 | 1, options: PreprocessorState): void {
     this.setState({
-      images: cleanSet(this.state.images, `${index}.preprocessorState`, options),
+      sides: cleanSet(this.state.sides, `${index}.latestSettings.preprocessorState`, options),
     });
   }
 
   private onEncoderOptionsChange(index: 0 | 1, options: EncoderOptions): void {
     this.setState({
-      images: cleanSet(this.state.images, `${index}.encoderState.options`, options),
+      sides: cleanSet(this.state.sides, `${index}.latestSettings.encoderState.options`, options),
     });
   }
 
+  private updateDocumentTitle(filename: string = ''): void {
+    document.title = filename ? `${filename} - ${originalDocumentTitle}` : originalDocumentTitle;
+  }
+
   componentWillReceiveProps(nextProps: Props): void {
     if (nextProps.file !== this.props.file) {
       this.updateFile(nextProps.file);
     }
   }
 
-  componentDidUpdate(prevProps: Props, prevState: State): void {
-    const { source, images } = this.state;
+  componentWillUnmount(): void {
+    this.updateDocumentTitle();
+  }
 
-    for (const [i, image] of images.entries()) {
-      const prevImage = prevState.images[i];
-      const sourceChanged = source !== prevState.source;
-      const encoderChanged = image.encoderState !== prevImage.encoderState;
-      const preprocessorChanged = image.preprocessorState !== prevImage.preprocessorState;
+  componentDidUpdate(prevProps: Props, prevState: State): void {
+    const { source, sides } = this.state;
+
+    const sourceDataChanged =
+      // Has the source object become set/unset?
+      !!source !== !!prevState.source ||
+      // Or has the processed data changed?
+      (source && prevState.source && source.processed !== prevState.source.processed);
+
+    for (const [i, side] of sides.entries()) {
+      const prevSettings = prevState.sides[i].latestSettings;
+      const encoderChanged = side.latestSettings.encoderState !== prevSettings.encoderState;
+      const preprocessorChanged =
+        side.latestSettings.preprocessorState !== prevSettings.preprocessorState;
 
       // The image only needs updated if the encoder/preprocessor settings have changed, or the
       // source has changed.
-      if (sourceChanged || encoderChanged || preprocessorChanged) {
-        if (prevImage.downloadUrl) URL.revokeObjectURL(prevImage.downloadUrl);
-        this.updateImage(i, {
-          skipPreprocessing: !sourceChanged && !preprocessorChanged,
-        }).catch((err) => {
-          console.error(err);
+      if (sourceDataChanged || encoderChanged || preprocessorChanged) {
+        this.queueUpdateImage(i, {
+          skipPreprocessing: !sourceDataChanged && !preprocessorChanged,
         });
       }
     }
@@ -253,10 +320,15 @@ export default class Compress extends Component<Props, State> {
 
   private async onCopyToOtherClick(index: 0 | 1) {
     const otherIndex = (index + 1) % 2;
-    const oldSettings = this.state.images[otherIndex];
+    const oldSettings = this.state.sides[otherIndex];
+    const newSettings = { ...this.state.sides[index] };
+
+    // Create a new object URL for the new settings. This avoids both sides sharing a URL, which
+    // means it can be safely revoked without impacting the other side.
+    if (newSettings.file) newSettings.downloadUrl = URL.createObjectURL(newSettings.file);
 
     this.setState({
-      images: cleanSet(this.state.images, otherIndex, this.state.images[index]),
+      sides: cleanSet(this.state.sides, otherIndex, newSettings),
     });
 
     const result = await this.props.showSnack('Settings copied across', {
@@ -267,13 +339,67 @@ export default class Compress extends Component<Props, State> {
     if (result !== 'undo') return;
 
     this.setState({
-      images: cleanSet(this.state.images, otherIndex, oldSettings),
+      sides: cleanSet(this.state.sides, otherIndex, oldSettings),
     });
   }
 
+  @bind
+  private async onInputProcessorChange(options: InputProcessorState): Promise<void> {
+    const source = this.state.source;
+    if (!source) return;
+
+    const oldRotate = source.inputProcessorState.rotate.rotate;
+    const newRotate = options.rotate.rotate;
+    const orientationChanged = oldRotate % 180 !== newRotate % 180;
+    const loadingCounter = this.state.loadingCounter + 1;
+    // Either processor is good enough here.
+    const processor = this.leftProcessor;
+
+    this.setState({
+      loadingCounter, loading: true,
+      source: cleanSet(source, 'inputProcessorState', options),
+    });
+
+    // Abort any current encode jobs, as they're redundant now.
+    this.leftProcessor.abortCurrent();
+    this.rightProcessor.abortCurrent();
+
+    try {
+      const processed = await processInput(source.decoded, options, processor);
+
+      // Another file has been opened/processed before this one processed.
+      if (this.state.loadingCounter !== loadingCounter) return;
+
+      let newState = { ...this.state, loading: false };
+      newState = cleanSet(newState, 'source.processed', processed);
+      newState = stateForNewSourceData(newState, newState.source!);
+
+      if (orientationChanged) {
+        // If orientation has changed, we should flip the resize values.
+        for (const i of [0, 1]) {
+          const resizeSettings = newState.sides[i].latestSettings.preprocessorState.resize;
+          newState = cleanMerge(newState, `sides.${i}.latestSettings.preprocessorState.resize`, {
+            width: resizeSettings.height,
+            height: resizeSettings.width,
+          });
+        }
+      }
+      this.setState(newState);
+    } catch (err) {
+      if (err.name === 'AbortError') return;
+      console.error(err);
+      // Another file has been opened/processed before this one processed.
+      if (this.state.loadingCounter !== loadingCounter) return;
+      this.props.showSnack('Processing error');
+      this.setState({ loading: false });
+    }
+  }
+
   @bind
   private async updateFile(file: File | Fileish) {
     const loadingCounter = this.state.loadingCounter + 1;
+    // Either processor is good enough here.
+    const processor = this.leftProcessor;
 
     this.setState({ loadingCounter, loading: true });
 
@@ -282,7 +408,7 @@ export default class Compress extends Component<Props, State> {
     this.rightProcessor.abortCurrent();
 
     try {
-      let data: ImageData;
+      let decoded: ImageData;
       let vectorImage: HTMLImageElement | undefined;
 
       // Special-case SVG. We need to avoid createImageBitmap because of
@@ -290,73 +416,96 @@ export default class Compress extends Component<Props, State> {
       // Also, we cache the HTMLImageElement so we can perform vector resizing later.
       if (file.type.startsWith('image/svg+xml')) {
         vectorImage = await processSvg(file);
-        data = drawableToImageData(vectorImage);
+        decoded = drawableToImageData(vectorImage);
       } else {
         // Either processor is good enough here.
-        data = await decodeImage(file, this.leftProcessor);
+        decoded = await decodeImage(file, processor);
       }
 
-      // Another file has been opened before this one processed.
+      const processed = await processInput(decoded, defaultInputProcessorState, processor);
+
+      // Another file has been opened/processed before this one processed.
       if (this.state.loadingCounter !== loadingCounter) return;
 
       let newState: State = {
         ...this.state,
-        source: { data, file, vectorImage },
+        source: {
+          decoded, file, vectorImage, processed,
+          inputProcessorState: defaultInputProcessorState,
+        },
         loading: false,
       };
 
+      newState = stateForNewSourceData(newState, newState.source!);
+
       for (const i of [0, 1]) {
-        // Ditch previous encodings
-        const downloadUrl = this.state.images[i].downloadUrl;
-        if (downloadUrl) URL.revokeObjectURL(downloadUrl!);
-
-        newState = cleanMerge(newState, `images.${i}`, {
-          preprocessed: undefined,
-          file: undefined,
-          downloadUrl: undefined,
-          data: undefined,
-        });
-
         // Default resize values come from the image:
-        newState = cleanMerge(newState, `images.${i}.preprocessorState.resize`, {
-          width: data.width,
-          height: data.height,
+        newState = cleanMerge(newState, `sides.${i}.latestSettings.preprocessorState.resize`, {
+          width: processed.width,
+          height: processed.height,
           method: vectorImage ? 'vector' : 'browser-high',
         });
       }
 
+      this.updateDocumentTitle(file.name);
       this.setState(newState);
     } catch (err) {
       if (err.name === 'AbortError') return;
       console.error(err);
-      // Another file has been opened before this one processed.
+      // Another file has been opened/processed before this one processed.
       if (this.state.loadingCounter !== loadingCounter) return;
       this.props.showSnack('Invalid image');
       this.setState({ loading: false });
     }
   }
 
+  /**
+   * Debounce the heavy lifting of updateImage.
+   * Otherwise, the thrashing causes jank, and sometimes crashes iOS Safari.
+   */
+  private queueUpdateImage(index: number, options: UpdateImageOptions = {}): void {
+    // Call updateImage after this delay, unless queueUpdateImage is called again, in which case the
+    // timeout is reset.
+    const delay = 100;
+
+    clearTimeout(this.updateImageTimeoutIds[index]);
+
+    this.updateImageTimeoutIds[index] = self.setTimeout(
+      () => {
+        this.updateImage(index, options).catch((err) => {
+          console.error(err);
+        });
+      },
+      delay,
+    );
+  }
+
   private async updateImage(index: number, options: UpdateImageOptions = {}): Promise<void> {
-    const { skipPreprocessing = false } = options;
+    const {
+      skipPreprocessing = false,
+    } = options;
     const { source } = this.state;
     if (!source) return;
 
     // Each time we trigger an async encode, the counter changes.
-    const loadingCounter = this.state.images[index].loadingCounter + 1;
+    const loadingCounter = this.state.sides[index].loadingCounter + 1;
 
-    let images = cleanMerge(this.state.images, index, {
+    let sides = cleanMerge(this.state.sides, index, {
       loadingCounter,
       loading: true,
     });
 
-    this.setState({ images });
+    this.setState({ sides });
 
-    const image = images[index];
+    const side = sides[index];
+    const settings = side.latestSettings;
 
     let file: File | Fileish | undefined;
     let preprocessed: ImageData | undefined;
     let data: ImageData | undefined;
-    const cacheResult = this.encodeCache.match(source, image.preprocessorState, image.encoderState);
+    const cacheResult = this.encodeCache.match(
+      source.processed, settings.preprocessorState, settings.encoderState,
+    );
     const processor = (index === 0) ? this.leftProcessor : this.rightProcessor;
 
     // Abort anything the processor is currently doing.
@@ -369,95 +518,113 @@ export default class Compress extends Component<Props, State> {
     } else {
       try {
         // Special case for identity
-        if (image.encoderState.type === identity.type) {
-          ({ file, data } = source);
+        if (settings.encoderState.type === identity.type) {
+          file = source.file;
+          data = source.processed;
         } else {
-          preprocessed = (skipPreprocessing && image.preprocessed)
-            ? image.preprocessed
-            : await preprocessImage(source, image.preprocessorState, processor);
+          preprocessed = (skipPreprocessing && side.preprocessed)
+            ? side.preprocessed
+            : await preprocessImage(source, settings.preprocessorState, processor);
 
-          file = await compressImage(preprocessed, image.encoderState, source.file.name, processor);
+          file = await compressImage(
+            preprocessed, settings.encoderState, source.file.name, processor,
+          );
           data = await decodeImage(file, processor);
 
           this.encodeCache.add({
-            source,
             data,
             preprocessed,
             file,
-            encoderState: image.encoderState,
-            preprocessorState: image.preprocessorState,
+            sourceData: source.processed,
+            encoderState: settings.encoderState,
+            preprocessorState: settings.preprocessorState,
           });
         }
       } catch (err) {
         if (err.name === 'AbortError') return;
-        this.props.showSnack(`Processing error (type=${image.encoderState.type}): ${err}`);
+        this.props.showSnack(`Processing error (type=${settings.encoderState.type}): ${err}`);
         throw err;
       }
     }
 
-    const latestImage = this.state.images[index];
+    const latestData = this.state.sides[index];
     // If a later encode has landed before this one, return.
-    if (loadingCounter < latestImage.loadedCounter) {
+    if (loadingCounter < latestData.loadedCounter) {
       return;
     }
 
-    images = cleanMerge(this.state.images, index, {
+    if (latestData.downloadUrl) URL.revokeObjectURL(latestData.downloadUrl);
+
+    sides = cleanMerge(this.state.sides, index, {
       file,
       data,
       preprocessed,
       downloadUrl: URL.createObjectURL(file),
-      loading: images[index].loadingCounter !== loadingCounter,
+      loading: sides[index].loadingCounter !== loadingCounter,
       loadedCounter: loadingCounter,
+      encodedSettings: settings,
     });
 
-    this.setState({ images });
+    this.setState({ sides });
   }
 
-  render({ }: Props, { loading, images, source, mobileView }: State) {
-    const [leftImage, rightImage] = images;
-    const [leftImageData, rightImageData] = images.map(i => i.data);
+  render({ onBack }: Props, { loading, sides, source, mobileView }: State) {
+    const [leftSide, rightSide] = sides;
+    const [leftImageData, rightImageData] = sides.map(i => i.data);
 
-    const options = images.map((image, index) => (
+    const options = sides.map((side, index) => (
       <Options
         source={source}
         mobileView={mobileView}
-        preprocessorState={image.preprocessorState}
-        encoderState={image.encoderState}
-        onEncoderTypeChange={this.onEncoderTypeChange.bind(this, index)}
-        onEncoderOptionsChange={this.onEncoderOptionsChange.bind(this, index)}
-        onPreprocessorOptionsChange={this.onPreprocessorOptionsChange.bind(this, index)}
+        preprocessorState={side.latestSettings.preprocessorState}
+        encoderState={side.latestSettings.encoderState}
+        onEncoderTypeChange={this.onEncoderTypeChange.bind(this, index as 0|1)}
+        onEncoderOptionsChange={this.onEncoderOptionsChange.bind(this, index as 0|1)}
+        onPreprocessorOptionsChange={this.onPreprocessorOptionsChange.bind(this, index as 0|1)}
       />
     ));
 
     const copyDirections =
       (mobileView ? ['down', 'up'] : ['right', 'left']) as CopyAcrossIconProps['copyDirection'][];
 
-    const results = images.map((image, index) => (
+    const results = sides.map((side, index) => (
       <Results
-        downloadUrl={image.downloadUrl}
-        imageFile={image.file}
+        downloadUrl={side.downloadUrl}
+        imageFile={side.file}
         source={source}
-        loading={loading || image.loading}
+        loading={loading || side.loading}
         copyDirection={copyDirections[index]}
-        onCopyToOtherClick={this.onCopyToOtherClick.bind(this, index)}
+        onCopyToOtherClick={this.onCopyToOtherClick.bind(this, index as 0|1)}
         buttonPosition={mobileView ? 'stack-right' : buttonPositions[index]}
       >
         {!mobileView ? null : [
           <ExpandIcon class={style.expandIcon} key="expand-icon"/>,
-          `${resultTitles[index]} (${encoderMap[image.encoderState.type].label})`,
+          `${resultTitles[index]} (${encoderMap[side.latestSettings.encoderState.type].label})`,
         ]}
       </Results>
     ));
 
+    // For rendering, we ideally want the settings that were used to create the data, not the latest
+    // settings.
+    const leftDisplaySettings = leftSide.encodedSettings || leftSide.latestSettings;
+    const rightDisplaySettings = rightSide.encodedSettings || rightSide.latestSettings;
+    const leftImgContain = leftDisplaySettings.preprocessorState.resize.enabled &&
+      leftDisplaySettings.preprocessorState.resize.fitMethod === 'contain';
+    const rightImgContain = rightDisplaySettings.preprocessorState.resize.enabled &&
+      rightDisplaySettings.preprocessorState.resize.fitMethod === 'contain';
+
     return (
       <div class={style.compress}>
         <Output
-          originalImage={source && source.data}
+          source={source}
           mobileView={mobileView}
           leftCompressed={leftImageData}
           rightCompressed={rightImageData}
-          leftImgContain={leftImage.preprocessorState.resize.fitMethod === 'cover'}
-          rightImgContain={rightImage.preprocessorState.resize.fitMethod === 'cover'}
+          leftImgContain={leftImgContain}
+          rightImgContain={rightImgContain}
+          onBack={onBack}
+          inputProcessorState={source && source.inputProcessorState}
+          onInputProcessorChange={this.onInputProcessorChange}
         />
         {mobileView
           ? (

src/components/compress/result-cache.ts

@@ -1,7 +1,6 @@
 import { EncoderState } from '../../codecs/encoders';
 import { Fileish } from '../../lib/initial-util';
 import { shallowEqual } from '../../lib/util';
-import { SourceImage } from '.';
 import { PreprocessorState } from '../../codecs/preprocessors';
 
 import * as identity from '../../codecs/identity/encoder-meta';
@@ -15,7 +14,7 @@ interface CacheResult {
 interface CacheEntry extends CacheResult {
   preprocessorState: PreprocessorState;
   encoderState: EncoderState;
-  source: SourceImage;
+  sourceData: ImageData;
 }
 
 const SIZE = 5;
@@ -32,13 +31,13 @@ export default class ResultCache {
   }
 
   match(
-    source: SourceImage,
+    sourceData: ImageData,
     preprocessorState: PreprocessorState,
     encoderState: EncoderState,
   ): CacheResult | undefined {
     const matchingIndex = this._entries.findIndex((entry) => {
       // Check for quick exits:
-      if (entry.source !== source) return false;
+      if (entry.sourceData !== sourceData) return false;
       if (entry.encoderState.type !== encoderState.type) return false;
 
       // Check that each set of options in the preprocessor are the same

src/components/compress/style.scss

@@ -22,7 +22,7 @@
   max-width: 400px;
   margin: 0 auto;
   width: calc(100% - 60px);
-  max-height: calc(100% - 143px);
+  max-height: calc(100% - 104px);
   overflow: hidden;
 
   @media (min-width: 600px) {
@@ -32,7 +32,7 @@
   }
 
   @media (min-width: 860px) {
-    max-height: 100%;
+    max-height: calc(100% - 40px);
   }
 }
 
@@ -40,6 +40,7 @@
   position: relative;
   display: flex;
   flex-flow: column;
+  overflow: hidden;
 
   // Reorder so headings appear after content:
   & > :nth-child(1) {