Refactored to reflect the strict-csp API change to an options object

Instantiating and using multiple image pools is not intended and can
lead to memory problems. Instead, users should use a single pool and
reuse that pool across all image processing. Therefore, let's add
a warning in the README to specify call this out and avoid users
of running into issues.

Relates to #1065

.husky/pre-commit

@@ -0,0 +1 @@
+npx lint-staged

README.md

@@ -1,36 +1,42 @@
 # [Squoosh]!
 
-[Squoosh] is 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 reduces image sizes through numerous formats.
 
 # API & CLI
 
-Squoosh now has [an API](https://github.com/GoogleChromeLabs/squoosh/tree/dev/libsquoosh) and [a CLI](https://github.com/GoogleChromeLabs/squoosh/tree/dev/cli) that allows you to compress many images at once.
+Squoosh has [an API](https://github.com/GoogleChromeLabs/squoosh/tree/dev/libsquoosh) and [a CLI](https://github.com/GoogleChromeLabs/squoosh/tree/dev/cli) to compress many images at once.
 
 # Privacy
 
-Google Analytics is used to record the following:
+Squoosh does not send your image to a server. All image compression processes locally.
 
-- [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.
-- If install is available, when Squoosh is installed, and what method was used to install Squoosh.
+However, Squoosh utilizes Google Analytics to collect the following:
 
-Image compression is handled locally; no additional data is sent to the server.
+- [Basic visitor data](https://support.google.com/analytics/answer/6004245?ref_topic=2919631).
+- The before and after image size value.
+- If Squoosh PWA, the type of Squoosh installation.
+- If Squoosh PWA, the installation time and date.
 
-# Building locally
+# Developing
 
-Clone the repo, and:
+To develop for Squoosh:
 
-```sh
-npm install
-npm run build
-```
+1. Clone the repository
+1. To install node packages, run:
+   ```sh
+   npm install
+   ```
+1. Then build the app by running:
+   ```sh
+   npm run build
+   ```
+1. After building, start the development server by running:
+   ```sh
+   npm run dev
+   ```
 
-You can run the development server with:
+# Contributing
 
-```sh
-npm run dev
-```
+Squoosh is an open-source project that appreciates all community involvement. To contribute to the project, follow the [contribute guide](/CONTRIBUTING.md).
 
 [squoosh]: https://squoosh.app

cli/package-lock.json

@@ -1,15 +1,15 @@
 {
   "name": "@squoosh/cli",
-  "version": "0.7.1",
+  "version": "0.7.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@squoosh/cli",
-      "version": "0.7.1",
+      "version": "0.7.2",
       "license": "Apache-2.0",
       "dependencies": {
-        "@squoosh/lib": "^0.3.1",
+        "@squoosh/lib": "^0.4.0",
         "commander": "^7.2.0",
         "json5": "^2.2.0",
         "kleur": "^4.1.4",
@@ -24,11 +24,15 @@
       }
     },
     "node_modules/@squoosh/lib": {
-      "version": "0.3.1",
-      "resolved": "https://registry.npmjs.org/@squoosh/lib/-/lib-0.3.1.tgz",
-      "integrity": "sha512-ni8gyTGgW9lH/yqaqgkxerGT7daSWNU9mtvWqj+/1qqzIT9YGfFvnTtDQRMIRjRCKQ5pkK/COufvWKuzHI6Dxw==",
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@squoosh/lib/-/lib-0.4.0.tgz",
+      "integrity": "sha512-O1LyugWLZjMI4JZeZMA5vzfhfPjfMZXH5/HmVkRagP8B70wH3uoR7tjxfGNdSavey357MwL8YJDxbGwBBdHp7Q==",
       "dependencies": {
+        "wasm-feature-detect": "^1.2.11",
         "web-streams-polyfill": "^3.0.3"
+      },
+      "engines": {
+        "node": " ^12.5.0 || ^14.0.0 || ^16.0.0 "
       }
     },
     "node_modules/ansi-regex": {
@@ -326,6 +330,11 @@
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
+    "node_modules/wasm-feature-detect": {
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/wasm-feature-detect/-/wasm-feature-detect-1.2.11.tgz",
+      "integrity": "sha512-HUqwaodrQGaZgz1lZaNioIkog9tkeEJjrM3eq4aUL04whXOVDRc/o2EGb/8kV0QX411iAYWEqq7fMBmJ6dKS6w=="
+    },
     "node_modules/wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
@@ -345,10 +354,11 @@
   },
   "dependencies": {
     "@squoosh/lib": {
-      "version": "0.3.1",
-      "resolved": "https://registry.npmjs.org/@squoosh/lib/-/lib-0.3.1.tgz",
-      "integrity": "sha512-ni8gyTGgW9lH/yqaqgkxerGT7daSWNU9mtvWqj+/1qqzIT9YGfFvnTtDQRMIRjRCKQ5pkK/COufvWKuzHI6Dxw==",
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@squoosh/lib/-/lib-0.4.0.tgz",
+      "integrity": "sha512-O1LyugWLZjMI4JZeZMA5vzfhfPjfMZXH5/HmVkRagP8B70wH3uoR7tjxfGNdSavey357MwL8YJDxbGwBBdHp7Q==",
       "requires": {
+        "wasm-feature-detect": "^1.2.11",
         "web-streams-polyfill": "^3.0.3"
       }
     },
@@ -581,6 +591,11 @@
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
+    "wasm-feature-detect": {
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/wasm-feature-detect/-/wasm-feature-detect-1.2.11.tgz",
+      "integrity": "sha512-HUqwaodrQGaZgz1lZaNioIkog9tkeEJjrM3eq4aUL04whXOVDRc/o2EGb/8kV0QX411iAYWEqq7fMBmJ6dKS6w=="
+    },
     "wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",

cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@squoosh/cli",
-  "version": "0.7.1",
+  "version": "0.7.2",
   "description": "A CLI for Squoosh",
   "public": true,
   "type": "module",
@@ -23,7 +23,7 @@
     "node": " ^12.20.2 || ^14.13.1 || ^16.0.0 "
   },
   "dependencies": {
-    "@squoosh/lib": "^0.3.1",
+    "@squoosh/lib": "^0.4.0",
     "commander": "^7.2.0",
     "json5": "^2.2.0",
     "kleur": "^4.1.4",

cli/src/index.js

@@ -4,6 +4,7 @@ import { program } from 'commander/esm.mjs';
 import JSON5 from 'json5';
 import path from 'path';
 import { promises as fsp } from 'fs';
+import { cpus } from 'os';
 import ora from 'ora';
 import kleur from 'kleur';
 
@@ -75,7 +76,9 @@ async function getInputFiles(paths) {
 
   for (const inputPath of paths) {
     const files = (await fsp.lstat(inputPath)).isDirectory()
-      ? (await fsp.readdir(inputPath, {withFileTypes: true})).filter(dirent => dirent.isFile()).map(dirent => path.join(inputPath, dirent.name))
+      ? (await fsp.readdir(inputPath, { withFileTypes: true }))
+          .filter((dirent) => dirent.isFile())
+          .map((dirent) => path.join(inputPath, dirent.name))
       : [inputPath];
     for (const file of files) {
       try {
@@ -101,7 +104,7 @@ async function getInputFiles(paths) {
 async function processFiles(files) {
   files = await getInputFiles(files);
 
-  const imagePool = new ImagePool();
+  const imagePool = new ImagePool(cpus().length);
 
   const results = new Map();
   const progress = progressTracker(results);
@@ -116,7 +119,8 @@ async function processFiles(files) {
   let decoded = 0;
   let decodedFiles = await Promise.all(
     files.map(async (file) => {
-      const image = imagePool.ingestImage(file);
+      const buffer = await fsp.readFile(file);
+      const image = imagePool.ingestImage(buffer);
       await image.decoded;
       results.set(image, {
         file,
@@ -178,7 +182,7 @@ async function processFiles(files) {
       const outputPath = path.join(
         program.opts().outputDir,
         path.basename(originalFile, path.extname(originalFile)) +
-        program.opts().suffix
+          program.opts().suffix,
       );
       for (const output of Object.values(image.encodedWith)) {
         const outputFile = `${outputPath}.${(await output).extension}`;

codecs/avif/Makefile

@@ -16,10 +16,10 @@ export
 OUT_ENC_JS = enc/avif_enc.js
 OUT_NODE_ENC_JS = enc/avif_node_enc.js
 OUT_ENC_MT_JS = enc/avif_enc_mt.js
+OUT_NODE_ENC_MT_JS = enc/avif_node_enc_mt.js
 OUT_DEC_JS = dec/avif_dec.js
 OUT_NODE_DEC_JS = dec/avif_node_dec.js
 
-OUT_ENC_CPP = enc/avif_enc.cpp
 OUT_ENC_CPP = enc/avif_enc.cpp
 OUT_DEC_CPP = dec/avif_dec.cpp
 ENVIRONMENT = worker
@@ -28,9 +28,9 @@ HELPER_MAKEFLAGS := -f helper.Makefile
 
 .PHONY: all clean
 
-all: $(OUT_ENC_JS) $(OUT_DEC_JS) $(OUT_ENC_MT_JS) $(OUT_NODE_ENC_JS) $(OUT_NODE_DEC_JS)
+all: $(OUT_ENC_JS) $(OUT_DEC_JS) $(OUT_ENC_MT_JS) $(OUT_NODE_ENC_JS) $(OUT_NODE_ENC_MT_JS) $(OUT_NODE_DEC_JS)
 
-$(OUT_NODE_ENC_JS): ENVIRONMENT=node
+$(OUT_NODE_ENC_JS) $(OUT_NODE_ENC_MT_JS): ENVIRONMENT=node
 $(OUT_NODE_ENC_JS) $(OUT_ENC_JS): $(OUT_ENC_CPP) $(CODEC_DIR)/CMakeLists.txt $(LIBAOM_DIR)/CMakeLists.txt
 	$(MAKE) \
 		$(HELPER_MAKEFLAGS) \
@@ -44,7 +44,7 @@ $(OUT_NODE_ENC_JS) $(OUT_ENC_JS): $(OUT_ENC_CPP) $(CODEC_DIR)/CMakeLists.txt $(L
 		ENVIRONMENT=$(ENVIRONMENT) \
 		LIBAVIF_FLAGS="-DAVIF_CODEC_AOM_DECODE=0"
 
-$(OUT_ENC_MT_JS): $(OUT_ENC_CPP) $(CODEC_DIR)/CMakeLists.txt $(LIBAOM_DIR)/CMakeLists.txt
+$(OUT_ENC_MT_JS) $(OUT_NODE_ENC_MT_JS): $(OUT_ENC_CPP) $(CODEC_DIR)/CMakeLists.txt $(LIBAOM_DIR)/CMakeLists.txt
 	$(MAKE) \
 		$(HELPER_MAKEFLAGS) \
 		OUT_JS=$@ \
@@ -89,4 +89,7 @@ $(LIBAOM_DIR)/CMakeLists.txt: $(LIBAOM_PACKAGE)
 clean:
 	$(MAKE) $(HELPER_MAKEFLAGS) OUT_JS=$(OUT_ENC_JS) clean
 	$(MAKE) $(HELPER_MAKEFLAGS) OUT_JS=$(OUT_ENC_MT_JS) clean
+	$(MAKE) $(HELPER_MAKEFLAGS) OUT_JS=$(OUT_ENC_NODE_JS) clean
+	$(MAKE) $(HELPER_MAKEFLAGS) OUT_JS=$(OUT_ENC_NODE_MT_JS) clean
 	$(MAKE) $(HELPER_MAKEFLAGS) OUT_JS=$(OUT_DEC_JS) clean
+	$(MAKE) $(HELPER_MAKEFLAGS) OUT_JS=$(OUT_DEV_NODE_JS) clean

codecs/avif/enc/avif_node_enc_mt.worker.js

@@ -0,0 +1 @@
+"use strict";var Module={};if(typeof process==="object"&&typeof process.versions==="object"&&typeof process.versions.node==="string"){var nodeWorkerThreads=require("worker_threads");var parentPort=nodeWorkerThreads.parentPort;parentPort.on("message",function(data){onmessage({data:data})});var nodeFS=require("fs");Object.assign(global,{self:global,require:require,Module:Module,location:{href:__filename},Worker:nodeWorkerThreads.Worker,importScripts:function(f){(0,eval)(nodeFS.readFileSync(f,"utf8"))},postMessage:function(msg){parentPort.postMessage(msg)},performance:global.performance||{now:function(){return Date.now()}}})}var initializedJS=false;function threadPrintErr(){var text=Array.prototype.slice.call(arguments).join(" ");console.error(text)}function threadAlert(){var text=Array.prototype.slice.call(arguments).join(" ");postMessage({cmd:"alert",text:text,threadId:Module["_pthread_self"]()})}var err=threadPrintErr;self.alert=threadAlert;Module["instantiateWasm"]=function(info,receiveInstance){var instance=new WebAssembly.Instance(Module["wasmModule"],info);receiveInstance(instance);Module["wasmModule"]=null;return instance.exports};function moduleLoaded(){}self.onmessage=function(e){try{if(e.data.cmd==="load"){Module["wasmModule"]=e.data.wasmModule;Module["wasmMemory"]=e.data.wasmMemory;Module["buffer"]=Module["wasmMemory"].buffer;Module["ENVIRONMENT_IS_PTHREAD"]=true;(e.data.urlOrBlob?import(e.data.urlOrBlob):import("./avif_node_enc_mt.js")).then(function(exports){return exports.default(Module)}).then(function(instance){Module=instance;moduleLoaded()})}else if(e.data.cmd==="objectTransfer"){Module["PThread"].receiveObjectTransfer(e.data)}else if(e.data.cmd==="run"){Module["__performance_now_clock_drift"]=performance.now()-e.data.time;Module["__emscripten_thread_init"](e.data.threadInfoStruct,0,0);var max=e.data.stackBase;var top=e.data.stackBase+e.data.stackSize;Module["establishStackSpace"](top,max);Module["PThread"].receiveObjectTransfer(e.data);Module["PThread"].threadInit();if(!initializedJS){Module["___embind_register_native_and_builtin_types"]();initializedJS=true}try{var result=Module["invokeEntryPoint"](e.data.start_routine,e.data.arg);if(Module["keepRuntimeAlive"]()){Module["PThread"].setExitStatus(result)}else{Module["PThread"].threadExit(result)}}catch(ex){if(ex==="Canceled!"){Module["PThread"].threadCancel()}else if(ex!="unwind"){if(ex instanceof Module["ExitStatus"]){if(Module["keepRuntimeAlive"]()){}else{Module["PThread"].threadExit(ex.status)}}else{Module["PThread"].threadExit(-2);throw ex}}}}else if(e.data.cmd==="cancel"){if(Module["_pthread_self"]()){Module["PThread"].threadCancel()}}else if(e.data.target==="setimmediate"){}else if(e.data.cmd==="processThreadQueue"){if(Module["_pthread_self"]()){Module["_emscripten_current_thread_process_queued_calls"]()}}else{err("worker.js received unknown command "+e.data.cmd);err(e.data)}}catch(ex){err("worker.js onmessage() captured an uncaught exception: "+ex);if(ex&&ex.stack)err(ex.stack);throw ex}};

codecs/jxl/Makefile

@@ -1,5 +1,5 @@
-CODEC_URL = https://gitlab.com/wg1/jpeg-xl.git
-CODEC_VERSION = ab7c5e9b6795134377aa4846ceaae2c5bc504f76
+CODEC_URL = https://github.com/libjxl/libjxl.git
+CODEC_VERSION = v0.5
 CODEC_DIR = node_modules/jxl
 CODEC_BUILD_ROOT := $(CODEC_DIR)/build
 CODEC_MT_BUILD_DIR := $(CODEC_BUILD_ROOT)/mt

codecs/jxl/enc/jxl_enc.cpp

@@ -10,15 +10,13 @@ using namespace emscripten;
 thread_local const val Uint8Array = val::global("Uint8Array");
 
 struct JXLOptions {
-  // 1 = slowest
-  // 7 = fastest
-  int speed;
+  int effort;
   float quality;
   bool progressive;
   int epf;
-  int nearLossless;
   bool lossyPalette;
   size_t decodingSpeedTier;
+  float photonNoiseIso;
 };
 
 val encode(std::string image, int width, int height, JXLOptions options) {
@@ -33,15 +31,20 @@ val encode(std::string image, int width, int height, JXLOptions options) {
   pool_ptr = &pool;
 #endif
 
+  size_t st = 10 - options.effort;
+  cparams.speed_tier = jxl::SpeedTier(st);
+
   cparams.epf = options.epf;
-  cparams.speed_tier = static_cast<jxl::SpeedTier>(options.speed);
-  cparams.near_lossless = options.nearLossless;
   cparams.decoding_speed_tier = options.decodingSpeedTier;
+  cparams.photon_noise_iso = options.photonNoiseIso;
 
   if (options.lossyPalette) {
     cparams.lossy_palette = true;
     cparams.palette_colors = 0;
     cparams.options.predictor = jxl::Predictor::Zero;
+    // Near-lossless assumes -R 0
+    cparams.responsive = 0;
+    cparams.modular_mode = true;
   }
 
   float quality = options.quality;
@@ -77,12 +80,6 @@ val encode(std::string image, int width, int height, JXLOptions options) {
     }
   }
 
-  if (cparams.near_lossless) {
-    // Near-lossless assumes -R 0
-    cparams.responsive = 0;
-    cparams.modular_mode = true;
-  }
-
   io.metadata.m.SetAlphaBits(8);
   if (!io.metadata.size.Set(width, height)) {
     return val::null();
@@ -110,12 +107,12 @@ val encode(std::string image, int width, int height, JXLOptions options) {
 
 EMSCRIPTEN_BINDINGS(my_module) {
   value_object<JXLOptions>("JXLOptions")
-      .field("speed", &JXLOptions::speed)
+      .field("effort", &JXLOptions::effort)
       .field("quality", &JXLOptions::quality)
       .field("progressive", &JXLOptions::progressive)
-      .field("nearLossless", &JXLOptions::nearLossless)
       .field("lossyPalette", &JXLOptions::lossyPalette)
       .field("decodingSpeedTier", &JXLOptions::decodingSpeedTier)
+      .field("photonNoiseIso", &JXLOptions::photonNoiseIso)
       .field("epf", &JXLOptions::epf);
 
   function("encode", &encode);

codecs/jxl/enc/jxl_enc.d.ts

@@ -1,11 +1,11 @@
 export interface EncodeOptions {
-  speed: number;
+  effort: number;
   quality: number;
   progressive: boolean;
   epf: number;
-  nearLossless: number;
   lossyPalette: boolean;
   decodingSpeedTier: number;
+  photonNoiseIso: number;
 }
 
 export interface JXLModule extends EmscriptenWasm.Module {

codecs/mozjpeg/enc/mozjpeg_enc.cpp

@@ -158,6 +158,11 @@ val encode(std::string image_in, int image_width, int image_height, MozJpegOptio
   if (!opts.auto_subsample && opts.color_space == JCS_YCbCr) {
     cinfo.comp_info[0].h_samp_factor = opts.chroma_subsample;
     cinfo.comp_info[0].v_samp_factor = opts.chroma_subsample;
+
+    if (opts.chroma_subsample > 2) {
+      // Otherwise encoding fails.
+      jpeg_c_set_int_param(&cinfo, JINT_DC_SCAN_OPT_MODE, 1);
+    }
   }
 
   if (!opts.baseline && opts.progressive) {

codecs/png/src/lib.rs

@@ -53,7 +53,11 @@ where
 #[wasm_bindgen]
 pub fn decode(mut data: &[u8]) -> ImageData {
     let mut decoder = png::Decoder::new(&mut data);
-    decoder.set_transformations(png::Transformations::EXPAND);
+    decoder.set_transformations(
+        png::Transformations::EXPAND | // Turn paletted images into RGB
+        png::Transformations::PACKING | // Turn images <8bit to 8bit
+        png::Transformations::STRIP_16, // Turn 16bit into 8 bit
+    );
     let (info, mut reader) = decoder.read_info().unwrap_throw();
     let num_pixels = (info.width * info.height) as usize;
     let mut buf = vec![0; num_pixels * 4];

codecs/visdif/BUILD.md

@@ -0,0 +1,14 @@
+This codec currently needs monkey-patching of Emscripten
+
+```
+$ docker run --rm -it -v $(PWD):/src squoosh-cpp "/bin/bash"
+# cat << EOF | patch /emsdk/upstream/emscripten/system/lib/dlmalloc.c
+659c659
+< #define MALLOC_ALIGNMENT ((size_t)(2 * sizeof(void *)))
+---
+> #define MALLOC_ALIGNMENT ((size_t)(16U))
+EOF
+# emcc --clear-cache
+# /emsdk/upstream/emscripten/embuilder build libdlmalloc --force
+# emmake make
+```

codecs/visdif/visdif.cpp

@@ -5,12 +5,19 @@
 using namespace emscripten;
 using namespace butteraugli;
 
+#define GAMMA 2.2
+
+static float SrgbToLinear[256];
+
+inline void gammaLookupTable() {
+  SrgbToLinear[0] = 0;
+  for (int i = 1; i < 256; ++i) {
+    SrgbToLinear[i] = static_cast<float>(255.0 * pow(i / 255.0, GAMMA));
+  }
+}
+
 // Turns an interleaved RGBA buffer into 4 planes for each color channel
-void planarize(std::vector<ImageF>& img,
-               const uint8_t* rgba,
-               int width,
-               int height,
-               float gamma = 2.2) {
+void planarize(std::vector<ImageF>& img, const uint8_t* rgba, int width, int height) {
   assert(img.size() == 0);
   img.push_back(ImageF(width, height));
   img.push_back(ImageF(width, height));
@@ -22,10 +29,10 @@ void planarize(std::vector<ImageF>& img,
     float* const row_b = img[2].Row(y);
     float* const row_a = img[3].Row(y);
     for (int x = 0; x < width; x++) {
-      row_r[x] = 255.0 * pow(rgba[(y * width + x) * 4 + 0] / 255.0, gamma);
-      row_g[x] = 255.0 * pow(rgba[(y * width + x) * 4 + 1] / 255.0, gamma);
-      row_b[x] = 255.0 * pow(rgba[(y * width + x) * 4 + 2] / 255.0, gamma);
-      row_a[x] = 255.0 * pow(rgba[(y * width + x) * 4 + 3] / 255.0, gamma);
+      row_r[x] = SrgbToLinear[rgba[(y * width + x) * 4 + 0]];
+      row_g[x] = SrgbToLinear[rgba[(y * width + x) * 4 + 1]];
+      row_b[x] = SrgbToLinear[rgba[(y * width + x) * 4 + 2]];
+      row_a[x] = SrgbToLinear[rgba[(y * width + x) * 4 + 3]];
     }
   }
 }
@@ -37,6 +44,7 @@ class VisDiff {
 
  public:
   VisDiff(std::string ref_img, int width, int height) {
+    gammaLookupTable();
     planarize(this->ref_img, (uint8_t*)ref_img.c_str(), width, height);
     this->width = width;
     this->height = height;

lib/data-url-plugin.js

@@ -14,28 +14,40 @@ import { promises as fs } from 'fs';
 
 import { lookup as lookupMime } from 'mime-types';
 
-const prefix = 'data-url:';
+const prefix = /^data-url(-text)?:/;
 
 export default function dataURLPlugin() {
   return {
     name: 'data-url-plugin',
     async resolveId(id, importer) {
-      if (!id.startsWith(prefix)) return;
+      const match = prefix.exec(id);
+      if (!match) return;
       return (
-        prefix + (await this.resolve(id.slice(prefix.length), importer)).id
+        match[0] + (await this.resolve(id.slice(match[0].length), importer)).id
       );
     },
     async load(id) {
-      if (!id.startsWith(prefix)) return;
-      const realId = id.slice(prefix.length);
+      const match = prefix.exec(id);
+      if (!match) return;
+
+      const isText = !!match[1];
+      const realId = id.slice(match[0].length);
       this.addWatchFile(realId);
 
       const source = await fs.readFile(realId);
       const type = lookupMime(realId) || 'text/plain';
 
-      return `export default 'data:${type};base64,${source.toString(
-        'base64',
-      )}';`;
+      if (isText) {
+        const encodedBody = encodeURIComponent(source.toString('utf8'));
+
+        return `export default ${JSON.stringify(
+          `data:${type};charset=utf-8,${encodedBody}`,
+        )};`;
+      }
+
+      return `export default ${JSON.stringify(
+        `data:${type};base64,${source.toString('base64')}`,
+      )};`;
     },
   };
 }

lib/entry-data-plugin.js

@@ -77,7 +77,9 @@ export default function entryDataPlugin() {
             }
 
             return JSON.stringify(
-              getDependencies(chunks, chunk).map((filename) => fileNameToURL(filename)),
+              getDependencies(chunks, chunk).map((filename) =>
+                fileNameToURL(filename),
+              ),
             );
           },
         );

lib/omt.ejs

@@ -28,10 +28,17 @@ if (!self.<%- amdFunctionName %>) {
       <% } else { %>
         new Promise(resolve => {
           if ("document" in self) {
-            const script = document.createElement("script");
-            script.src = uri;
-            script.onload = resolve;
-            document.head.appendChild(script);
+            const link = document.createElement("link");
+            link.rel = "preload";
+            link.as = "script";
+            link.href = uri;
+            link.onload = () => {
+              const script = document.createElement("script");
+              script.src = uri;
+              script.onload = resolve;
+              document.head.appendChild(script);
+            };
+            document.head.appendChild(link);
           } else {
             self.nextDefineUri = uri;
             importScripts(uri);

libsquoosh/README.md

@@ -16,21 +16,25 @@ You can start using the libSquoosh by adding these lines to the top of your JS p
 
 ```js
 import { ImagePool } from '@squoosh/lib';
-const imagePool = new ImagePool();
+import { cpus } from 'os';
+const imagePool = new ImagePool(cpus().length);
 ```
 
-This will create an image pool with an underlying processing pipeline that you can use to ingest and encode images. The ImagePool constructor takes one argument that defines how many parallel operations it is allowed to run at any given time. By default, this number is set to the amount of CPU cores available in the system it is running on.
+This will create an image pool with an underlying processing pipeline that you can use to ingest and encode images. The ImagePool constructor takes one argument that defines how many parallel operations it is allowed to run at any given time.
+
+:warning: Important! Make sure to only create 1 `ImagePool` when performing parallel image processing. If you create multiple pools, the `ImagePool` can run out of memory and crash. By reusing a single `ImagePool`, you can ensure that the backing worker queue and processing pipeline releases memory prior to processing the next image.
 
 ## Ingesting images
 
 You can ingest a new image like so:
 
 ```js
-const imagePath = 'path/to/image.png';
-const image = imagePool.ingestImage(imagePath);
+import fs from 'fs/promises';
+const file = await fs.readFile('./path/to/image.png');
+const image = imagePool.ingestImage(file);
 ```
 
-The `ingestImage` function can take anything the node [`readFile`][readfile] function can take, uncluding a buffer and `FileHandle`.
+The `ingestImage` function can accept any [`ArrayBuffer`][arraybuffer] whether that is from `readFile()` or `fetch()`.
 
 The returned `image` object is a representation of the original image, that you can now preprocess, encode, and extract information about.
 
@@ -39,7 +43,7 @@ The returned `image` object is a representation of the original image, that you
 When an image has been ingested, you can start preprocessing it and encoding it to other formats. This example will resize the image and then encode it to a `.jpg` and `.jxl` image:
 
 ```js
-await image.decoded; //Wait until the image is decoded before running preprocessors. 
+await image.decoded; //Wait until the image is decoded before running preprocessors.
 
 const preprocessOptions = {
   //When both width and height are specified, the image resized to specified size.
@@ -47,7 +51,7 @@ const preprocessOptions = {
     enabled: true,
     width: 100,
     height: 50,
-  }
+  },
   /*
   //When either width or height is specified, the image resized to specified size keeping aspect ratio.
   resize: {
@@ -55,7 +59,7 @@ const preprocessOptions = {
     width: 100,
   }
   */
-}
+};
 await image.preprocess(preprocessOptions);
 
 const encodeOptions = {
@@ -63,9 +67,8 @@ const encodeOptions = {
   jxl: {
     quality: 90,
   },
-}
+};
 await image.encode(encodeOptions);
-
 ```
 
 The default values for each option can be found in the [`codecs.ts`][codecs.ts] file under `defaultEncoderOptions`. Every unspecified value will use the default value specified there. _Better documentation is needed here._
@@ -168,4 +171,4 @@ const encodeOptions: {
 [squoosh]: https://squoosh.app
 [codecs.ts]: https://github.com/GoogleChromeLabs/squoosh/blob/dev/libsquoosh/src/codecs.ts
 [butteraugli]: https://github.com/google/butteraugli
-[readfile]: https://nodejs.org/api/fs.html#fs_fspromises_readfile_path_options
+[arraybuffer]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer

libsquoosh/lib/chunk-plugin.js

@@ -0,0 +1,49 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { promises as fs } from 'fs';
+import { basename } from 'path';
+
+const defaultOpts = {
+  prefix: 'chunk-url',
+};
+
+export default function chunkPlugin(opts) {
+  opts = { ...defaultOpts, ...opts };
+
+  const prefix = opts.prefix + ':';
+  return {
+    name: 'chunk-plugin',
+    async resolveId(id, importer) {
+      if (!id.startsWith(prefix)) return;
+      const realId = id.slice(prefix.length);
+      const resolveResult = await this.resolve(realId, importer);
+
+      if (!resolveResult) {
+        throw Error(`Cannot find ${realId}`);
+      }
+      return prefix + resolveResult.id;
+    },
+    async load(id) {
+      if (!id.startsWith(prefix)) return;
+      const realId = id.slice(prefix.length);
+      const source = await fs.readFile(realId);
+      this.addWatchFile(realId);
+
+      return `export default import.meta.ROLLUP_FILE_URL_${this.emitFile({
+        type: 'chunk',
+        source,
+        id: realId,
+      })}`;
+    },
+  };
+}

libsquoosh/package-lock.json

@@ -1,14 +1,15 @@
 {
   "name": "@squoosh/lib",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@squoosh/lib",
-      "version": "0.3.1",
+      "version": "0.4.0",
       "license": "Apache-2.0",
       "dependencies": {
+        "wasm-feature-detect": "^1.2.11",
         "web-streams-polyfill": "^3.0.3"
       },
       "devDependencies": {
@@ -22,6 +23,9 @@
         "rollup-plugin-terser": "^7.0.2",
         "typescript": "^4.1.3",
         "which": "^2.0.2"
+      },
+      "engines": {
+        "node": " ^12.5.0 || ^14.0.0 || ^16.0.0 "
       }
     },
     "node_modules/@babel/code-frame": {
@@ -2055,6 +2059,11 @@
         "node": ">=4"
       }
     },
+    "node_modules/wasm-feature-detect": {
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/wasm-feature-detect/-/wasm-feature-detect-1.2.11.tgz",
+      "integrity": "sha512-HUqwaodrQGaZgz1lZaNioIkog9tkeEJjrM3eq4aUL04whXOVDRc/o2EGb/8kV0QX411iAYWEqq7fMBmJ6dKS6w=="
+    },
     "node_modules/web-streams-polyfill": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.0.3.tgz",
@@ -3948,6 +3957,11 @@
       "integrity": "sha512-PqSoPh/pWetQ2phoj5RLiaqIk4kCNwoV3CI+LfGmWLKI3rE3kl1h59XpX2BjgDrmbxD9ARtQobPGU1SguCYuQg==",
       "dev": true
     },
+    "wasm-feature-detect": {
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/wasm-feature-detect/-/wasm-feature-detect-1.2.11.tgz",
+      "integrity": "sha512-HUqwaodrQGaZgz1lZaNioIkog9tkeEJjrM3eq4aUL04whXOVDRc/o2EGb/8kV0QX411iAYWEqq7fMBmJ6dKS6w=="
+    },
     "web-streams-polyfill": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.0.3.tgz",

libsquoosh/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@squoosh/lib",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "A Node library for Squoosh",
   "public": true,
   "main": "./build/index.js",
@@ -22,6 +22,7 @@
     "node": " ^12.5.0 || ^14.0.0 || ^16.0.0 "
   },
   "dependencies": {
+    "wasm-feature-detect": "^1.2.11",
     "web-streams-polyfill": "^3.0.3"
   },
   "devDependencies": {

libsquoosh/rollup.config.js

@@ -2,6 +2,7 @@ import resolve from '@rollup/plugin-node-resolve';
 import cjs from '@rollup/plugin-commonjs';
 import simpleTS from './lib/simple-ts';
 import asset from './lib/asset-plugin.js';
+import chunk from './lib/chunk-plugin.js';
 import json from './lib/json-plugin.js';
 import autojson from './lib/autojson-plugin.js';
 import { getBabelOutputPlugin } from '@rollup/plugin-babel';
@@ -9,7 +10,7 @@ import { builtinModules } from 'module';
 
 /** @type {import('rollup').RollupOptions} */
 export default {
-  input: 'src/index.js',
+  input: 'src/index.ts',
   output: {
     dir: 'build',
     format: 'cjs',
@@ -18,6 +19,7 @@ export default {
   plugins: [
     resolve(),
     cjs(),
+    chunk(),
     asset(),
     autojson(),
     json(),

libsquoosh/src/codecs.ts

@@ -1,5 +1,19 @@
 import { promises as fsp } from 'fs';
 import { instantiateEmscriptenWasm, pathify } from './emscripten-utils.js';
+import { threads } from 'wasm-feature-detect';
+import { cpus } from 'os';
+
+// We use `navigator.hardwareConcurrency` for Emscripten’s pthread pool size.
+// This is the only workaround I can get working without crying.
+(globalThis as any).navigator = {
+  hardwareConcurrency: cpus().length,
+};
+
+interface DecodeModule extends EmscriptenWasm.Module {
+  decode: (data: Uint8Array) => ImageData;
+}
+
+type DecodeModuleFactory = EmscriptenWasm.ModuleFactory<DecodeModule>;
 
 interface RotateModuleInstance {
   exports: {
@@ -15,17 +29,26 @@ interface ResizeWithAspectParams {
   target_height: number;
 }
 
-interface ResizeInstantiateOptions {
+export interface ResizeOptions {
   width: number;
   height: number;
-  method: string;
+  method: 'triangle' | 'catrom' | 'mitchell' | 'lanczos3';
   premultiply: boolean;
   linearRGB: boolean;
 }
 
+export interface QuantOptions {
+  numColors: number;
+  dither: number;
+}
+
+export interface RotateOptions {
+  numRotations: number;
+}
+
 declare global {
   // Needed for being able to use ImageData as type in codec types
-  type ImageData = typeof import('./image_data.js');
+  type ImageData = import('./image_data.js').default;
   // Needed for being able to assign to `globalThis.ImageData`
   var ImageData: ImageData['constructor'];
 }
@@ -33,34 +56,47 @@ declare global {
 import type { QuantizerModule } from '../../codecs/imagequant/imagequant.js';
 
 // MozJPEG
+import type { MozJPEGModule as MozJPEGEncodeModule } from '../../codecs/mozjpeg/enc/mozjpeg_enc';
 import mozEnc from '../../codecs/mozjpeg/enc/mozjpeg_node_enc.js';
 import mozEncWasm from 'asset-url:../../codecs/mozjpeg/enc/mozjpeg_node_enc.wasm';
 import mozDec from '../../codecs/mozjpeg/dec/mozjpeg_node_dec.js';
 import mozDecWasm from 'asset-url:../../codecs/mozjpeg/dec/mozjpeg_node_dec.wasm';
+import type { EncodeOptions as MozJPEGEncodeOptions } from '../../codecs/mozjpeg/enc/mozjpeg_enc';
 
 // WebP
+import type { WebPModule as WebPEncodeModule } from '../../codecs/webp/enc/webp_enc';
 import webpEnc from '../../codecs/webp/enc/webp_node_enc.js';
 import webpEncWasm from 'asset-url:../../codecs/webp/enc/webp_node_enc.wasm';
 import webpDec from '../../codecs/webp/dec/webp_node_dec.js';
 import webpDecWasm from 'asset-url:../../codecs/webp/dec/webp_node_dec.wasm';
+import type { EncodeOptions as WebPEncodeOptions } from '../../codecs/webp/enc/webp_enc.js';
 
 // AVIF
+import type { AVIFModule as AVIFEncodeModule } from '../../codecs/avif/enc/avif_enc';
 import avifEnc from '../../codecs/avif/enc/avif_node_enc.js';
 import avifEncWasm from 'asset-url:../../codecs/avif/enc/avif_node_enc.wasm';
+import avifEncMt from '../../codecs/avif/enc/avif_node_enc_mt.js';
+import avifEncMtWorker from 'chunk-url:../../codecs/avif/enc/avif_node_enc_mt.worker.js';
+import avifEncMtWasm from 'asset-url:../../codecs/avif/enc/avif_node_enc_mt.wasm';
 import avifDec from '../../codecs/avif/dec/avif_node_dec.js';
 import avifDecWasm from 'asset-url:../../codecs/avif/dec/avif_node_dec.wasm';
+import type { EncodeOptions as AvifEncodeOptions } from '../../codecs/avif/enc/avif_enc.js';
 
 // JXL
+import type { JXLModule as JXLEncodeModule } from '../../codecs/jxl/enc/jxl_enc';
 import jxlEnc from '../../codecs/jxl/enc/jxl_node_enc.js';
 import jxlEncWasm from 'asset-url:../../codecs/jxl/enc/jxl_node_enc.wasm';
 import jxlDec from '../../codecs/jxl/dec/jxl_node_dec.js';
 import jxlDecWasm from 'asset-url:../../codecs/jxl/dec/jxl_node_dec.wasm';
+import type { EncodeOptions as JxlEncodeOptions } from '../../codecs/jxl/enc/jxl_enc.js';
 
 // WP2
+import type { WP2Module as WP2EncodeModule } from '../../codecs/wp2/enc/wp2_enc';
 import wp2Enc from '../../codecs/wp2/enc/wp2_node_enc.js';
 import wp2EncWasm from 'asset-url:../../codecs/wp2/enc/wp2_node_enc.wasm';
 import wp2Dec from '../../codecs/wp2/dec/wp2_node_dec.js';
 import wp2DecWasm from 'asset-url:../../codecs/wp2/dec/wp2_node_dec.wasm';
+import type { EncodeOptions as WP2EncodeOptions } from '../../codecs/wp2/enc/wp2_enc.js';
 
 // PNG
 import * as pngEncDec from '../../codecs/png/pkg/squoosh_png.js';
@@ -73,6 +109,9 @@ const pngEncDecPromise = pngEncDec.default(
 import * as oxipng from '../../codecs/oxipng/pkg/squoosh_oxipng.js';
 import oxipngWasm from 'asset-url:../../codecs/oxipng/pkg/squoosh_oxipng_bg.wasm';
 const oxipngPromise = oxipng.default(fsp.readFile(pathify(oxipngWasm)));
+interface OxiPngEncodeOptions {
+  level: number;
+}
 
 // Resize
 import * as resize from '../../codecs/resize/pkg/squoosh_resize.js';
@@ -149,13 +188,7 @@ export const preprocessors = {
         buffer: Uint8Array,
         input_width: number,
         input_height: number,
-        {
-          width,
-          height,
-          method,
-          premultiply,
-          linearRGB,
-        }: ResizeInstantiateOptions,
+        { width, height, method, premultiply, linearRGB }: ResizeOptions,
       ) => {
         ({ width, height } = resizeWithAspect({
           input_width,
@@ -196,7 +229,7 @@ export const preprocessors = {
         buffer: Uint8Array,
         width: number,
         height: number,
-        { numColors, dither }: { numColors: number; dither: number },
+        { numColors, dither }: QuantOptions,
       ) =>
         new ImageData(
           imageQuant.quantize(buffer, width, height, numColors, dither),
@@ -217,7 +250,7 @@ export const preprocessors = {
         buffer: Uint8Array,
         width: number,
         height: number,
-        { numRotations }: { numRotations: number },
+        { numRotations }: RotateOptions,
       ) => {
         const degrees = (numRotations * 90) % 360;
         const sameDimensions = degrees == 0 || degrees == 180;
@@ -246,15 +279,20 @@ export const preprocessors = {
       numRotations: 0,
     },
   },
-};
+} as const;
 
 export const codecs = {
   mozjpeg: {
     name: 'MozJPEG',
     extension: 'jpg',
     detectors: [/^\xFF\xD8\xFF/],
-    dec: () => instantiateEmscriptenWasm(mozDec, mozDecWasm),
-    enc: () => instantiateEmscriptenWasm(mozEnc, mozEncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(mozDec as DecodeModuleFactory, mozDecWasm),
+    enc: () =>
+      instantiateEmscriptenWasm(
+        mozEnc as EmscriptenWasm.ModuleFactory<MozJPEGEncodeModule>,
+        mozEncWasm,
+      ),
     defaultEncoderOptions: {
       quality: 75,
       baseline: false,
@@ -283,8 +321,13 @@ export const codecs = {
     name: 'WebP',
     extension: 'webp',
     detectors: [/^RIFF....WEBPVP8[LX ]/s],
-    dec: () => instantiateEmscriptenWasm(webpDec, webpDecWasm),
-    enc: () => instantiateEmscriptenWasm(webpEnc, webpEncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(webpDec as DecodeModuleFactory, webpDecWasm),
+    enc: () =>
+      instantiateEmscriptenWasm(
+        webpEnc as EmscriptenWasm.ModuleFactory<WebPEncodeModule>,
+        webpEncWasm,
+      ),
     defaultEncoderOptions: {
       quality: 75,
       target_size: 0,
@@ -324,8 +367,21 @@ export const codecs = {
     name: 'AVIF',
     extension: 'avif',
     detectors: [/^\x00\x00\x00 ftypavif\x00\x00\x00\x00/],
-    dec: () => instantiateEmscriptenWasm(avifDec, avifDecWasm),
-    enc: () => instantiateEmscriptenWasm(avifEnc, avifEncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(avifDec as DecodeModuleFactory, avifDecWasm),
+    enc: async () => {
+      if (await threads()) {
+        return instantiateEmscriptenWasm(
+          avifEncMt as EmscriptenWasm.ModuleFactory<AVIFEncodeModule>,
+          avifEncMtWasm,
+          avifEncMtWorker,
+        );
+      }
+      return instantiateEmscriptenWasm(
+        avifEnc as EmscriptenWasm.ModuleFactory<AVIFEncodeModule>,
+        avifEncWasm,
+      );
+    },
     defaultEncoderOptions: {
       cqLevel: 33,
       cqAlphaLevel: -1,
@@ -348,16 +404,21 @@ export const codecs = {
     name: 'JPEG-XL',
     extension: 'jxl',
     detectors: [/^\xff\x0a/],
-    dec: () => instantiateEmscriptenWasm(jxlDec, jxlDecWasm),
-    enc: () => instantiateEmscriptenWasm(jxlEnc, jxlEncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(jxlDec as DecodeModuleFactory, jxlDecWasm),
+    enc: () =>
+      instantiateEmscriptenWasm(
+        jxlEnc as EmscriptenWasm.ModuleFactory<JXLEncodeModule>,
+        jxlEncWasm,
+      ),
     defaultEncoderOptions: {
-      speed: 4,
+      effort: 1,
       quality: 75,
       progressive: false,
       epf: -1,
-      nearLossless: 0,
       lossyPalette: false,
       decodingSpeedTier: 0,
+      photonNoiseIso: 0,
     },
     autoOptimize: {
       option: 'quality',
@@ -369,8 +430,13 @@ export const codecs = {
     name: 'WebP2',
     extension: 'wp2',
     detectors: [/^\xF4\xFF\x6F/],
-    dec: () => instantiateEmscriptenWasm(wp2Dec, wp2DecWasm),
-    enc: () => instantiateEmscriptenWasm(wp2Enc, wp2EncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(wp2Dec as DecodeModuleFactory, wp2DecWasm),
+    enc: () =>
+      instantiateEmscriptenWasm(
+        wp2Enc as EmscriptenWasm.ModuleFactory<WP2EncodeModule>,
+        wp2EncWasm,
+      ),
     defaultEncoderOptions: {
       quality: 75,
       alpha_quality: 75,
@@ -401,7 +467,7 @@ export const codecs = {
       await oxipngPromise;
       return {
         encode: (
-          buffer: Uint8Array,
+          buffer: Uint8ClampedArray | ArrayBuffer,
           width: number,
           height: number,
           opts: { level: number },
@@ -424,4 +490,13 @@ export const codecs = {
       max: 1,
     },
   },
+} as const;
+
+export {
+  MozJPEGEncodeOptions,
+  WebPEncodeOptions,
+  AvifEncodeOptions,
+  JxlEncodeOptions,
+  WP2EncodeOptions,
+  OxiPngEncodeOptions,
 };

libsquoosh/src/emscripten-utils.ts

@@ -1,4 +1,4 @@
-import { fileURLToPath } from 'url';
+import { fileURLToPath, URL } from 'url';
 
 export function pathify(path: string): string {
   if (path.startsWith('file://')) {
@@ -10,10 +10,17 @@ export function pathify(path: string): string {
 export function instantiateEmscriptenWasm<T extends EmscriptenWasm.Module>(
   factory: EmscriptenWasm.ModuleFactory<T>,
   path: string,
+  workerJS: string = '',
 ): Promise<T> {
   return factory({
-    locateFile() {
-      return pathify(path);
+    locateFile(requestPath) {
+      // The glue code generated by emscripten uses the original
+      // file names of the worker file and the wasm binary.
+      // These will have changed in the bundling process and
+      // we need to inject them here.
+      if (requestPath.endsWith('.wasm')) return pathify(path);
+      if (requestPath.endsWith('.worker.js')) return pathify(workerJS);
+      return requestPath;
     },
   });
 }

libsquoosh/src/index.js

@@ -1,224 +0,0 @@
-import { isMainThread } from 'worker_threads';
-import { cpus } from 'os';
-import { promises as fsp } from 'fs';
-
-import { codecs as encoders, preprocessors } from './codecs.js';
-import WorkerPool from './worker_pool.js';
-import { autoOptimize } from './auto-optimizer.js';
-
-export { ImagePool, encoders, preprocessors };
-
-async function decodeFile({ file }) {
-  let buffer;
-  if (ArrayBuffer.isView(file)) {
-    buffer = Buffer.from(file.buffer);
-    file = 'Binary blob';
-  } else if (file instanceof ArrayBuffer) {
-    buffer = Buffer.from(file);
-    file = 'Binary blob';
-  } else if (file instanceof Buffer) {
-    buffer = file;
-    file = 'Binary blob';
-  } else if (typeof file === 'string') {
-    buffer = await fsp.readFile(file);
-  } else {
-    throw Error('Unexpected input type');
-  }
-  const firstChunk = buffer.slice(0, 16);
-  const firstChunkString = Array.from(firstChunk)
-    .map((v) => String.fromCodePoint(v))
-    .join('');
-  const key = Object.entries(encoders).find(([name, { detectors }]) =>
-    detectors.some((detector) => detector.exec(firstChunkString)),
-  )?.[0];
-  if (!key) {
-    throw Error(`${file} has an unsupported format`);
-  }
-  const rgba = (await encoders[key].dec()).decode(new Uint8Array(buffer));
-  return {
-    bitmap: rgba,
-    size: buffer.length,
-  };
-}
-
-async function preprocessImage({ preprocessorName, options, image }) {
-  const preprocessor = await preprocessors[preprocessorName].instantiate();
-  image.bitmap = await preprocessor(
-    image.bitmap.data,
-    image.bitmap.width,
-    image.bitmap.height,
-    options,
-  );
-  return image;
-}
-
-async function encodeImage({
-  bitmap: bitmapIn,
-  encName,
-  encConfig,
-  optimizerButteraugliTarget,
-  maxOptimizerRounds,
-}) {
-  let binary;
-  let optionsUsed = encConfig;
-  const encoder = await encoders[encName].enc();
-  if (encConfig === 'auto') {
-    const optionToOptimize = encoders[encName].autoOptimize.option;
-    const decoder = await encoders[encName].dec();
-    const encode = (bitmapIn, quality) =>
-      encoder.encode(
-        bitmapIn.data,
-        bitmapIn.width,
-        bitmapIn.height,
-        Object.assign({}, encoders[encName].defaultEncoderOptions, {
-          [optionToOptimize]: quality,
-        }),
-      );
-    const decode = (binary) => decoder.decode(binary);
-    const { binary: optimizedBinary, quality } = await autoOptimize(
-      bitmapIn,
-      encode,
-      decode,
-      {
-        min: encoders[encName].autoOptimize.min,
-        max: encoders[encName].autoOptimize.max,
-        butteraugliDistanceGoal: optimizerButteraugliTarget,
-        maxRounds: maxOptimizerRounds,
-      },
-    );
-    binary = optimizedBinary;
-    optionsUsed = {
-      // 5 significant digits is enough
-      [optionToOptimize]: Math.round(quality * 10000) / 10000,
-    };
-  } else {
-    binary = encoder.encode(
-      bitmapIn.data.buffer,
-      bitmapIn.width,
-      bitmapIn.height,
-      encConfig,
-    );
-  }
-  return {
-    optionsUsed,
-    binary,
-    extension: encoders[encName].extension,
-    size: binary.length,
-  };
-}
-
-// both decoding and encoding go through the worker pool
-function handleJob(params) {
-  const { operation } = params;
-  switch (operation) {
-    case 'encode':
-      return encodeImage(params);
-    case 'decode':
-      return decodeFile(params);
-    case 'preprocess':
-      return preprocessImage(params);
-    default:
-      throw Error(`Invalid job "${operation}"`);
-  }
-}
-
-/**
- * Represents an ingested image.
- */
-class Image {
-  constructor(workerPool, file) {
-    this.file = file;
-    this.workerPool = workerPool;
-    this.decoded = workerPool.dispatchJob({ operation: 'decode', file });
-    this.encodedWith = {};
-  }
-
-  /**
-   * Define one or several preprocessors to use on the image.
-   * @param {object} preprocessOptions - An object with preprocessors to use, and their settings.
-   * @returns {Promise<undefined>} - A promise that resolves when all preprocessors have completed their work.
-   */
-  async preprocess(preprocessOptions = {}) {
-    for (const [name, options] of Object.entries(preprocessOptions)) {
-      if (!Object.keys(preprocessors).includes(name)) {
-        throw Error(`Invalid preprocessor "${name}"`);
-      }
-      const preprocessorOptions = Object.assign(
-        {},
-        preprocessors[name].defaultOptions,
-        options,
-      );
-      this.decoded = this.workerPool.dispatchJob({
-        operation: 'preprocess',
-        preprocessorName: name,
-        image: await this.decoded,
-        options: preprocessorOptions,
-      });
-      await this.decoded;
-    }
-  }
-
-  /**
-   * Define one or several encoders to use on the image.
-   * @param {object} encodeOptions - An object with encoders to use, and their settings.
-   * @returns {Promise<undefined>} - A promise that resolves when the image has been encoded with all the specified encoders.
-   */
-  async encode(encodeOptions = {}) {
-    const { bitmap } = await this.decoded;
-    for (const [encName, options] of Object.entries(encodeOptions)) {
-      if (!Object.keys(encoders).includes(encName)) {
-        continue;
-      }
-      const encRef = encoders[encName];
-      const encConfig =
-        typeof options === 'string'
-          ? options
-          : Object.assign({}, encRef.defaultEncoderOptions, options);
-      this.encodedWith[encName] = this.workerPool.dispatchJob({
-        operation: 'encode',
-        bitmap,
-        encName,
-        encConfig,
-        optimizerButteraugliTarget: Number(
-          encodeOptions.optimizerButteraugliTarget ?? 1.4,
-        ),
-        maxOptimizerRounds: Number(encodeOptions.maxOptimizerRounds ?? 6),
-      });
-    }
-    await Promise.all(Object.values(this.encodedWith));
-  }
-}
-
-/**
- * A pool where images can be ingested and squooshed.
- */
-class ImagePool {
-  /**
-   * Create a new pool.
-   * @param {number} [threads] - Number of concurrent image processes to run in the pool. Defaults to the number of CPU cores in the system.
-   */
-  constructor(threads) {
-    this.workerPool = new WorkerPool(threads || cpus().length, __filename);
-  }
-
-  /**
-   * Ingest an image into the image pool.
-   * @param {string | Buffer | URL | object} image - The image or path to the image that should be ingested and decoded.
-   * @returns {Image} - A custom class reference to the decoded image.
-   */
-  ingestImage(image) {
-    return new Image(this.workerPool, image);
-  }
-
-  /**
-   * Closes the underlying image processing pipeline. The already processed images will still be there, but no new processing can start.
-   * @returns {Promise<undefined>} - A promise that resolves when the underlying pipeline has closed.
-   */
-  async close() {
-    await this.workerPool.join();
-  }
-}
-
-if (!isMainThread) {
-  WorkerPool.useThisThreadAsWorker(handleJob);
-}

libsquoosh/src/index.ts

@@ -0,0 +1,307 @@
+import { isMainThread } from 'worker_threads';
+
+import {
+  AvifEncodeOptions,
+  codecs as encoders,
+  JxlEncodeOptions,
+  MozJPEGEncodeOptions,
+  OxiPngEncodeOptions,
+  preprocessors,
+  QuantOptions,
+  ResizeOptions,
+  RotateOptions,
+  WebPEncodeOptions,
+  WP2EncodeOptions,
+} from './codecs.js';
+import WorkerPool from './worker_pool.js';
+import { autoOptimize } from './auto-optimizer.js';
+import type ImageData from './image_data';
+
+export { ImagePool, encoders, preprocessors };
+type EncoderKey = keyof typeof encoders;
+type PreprocessorKey = keyof typeof preprocessors;
+
+type PreprocessOptions = {
+  resize?: ResizeOptions;
+  quant?: QuantOptions;
+  rotate?: RotateOptions;
+};
+type EncodeResult = {
+  optionsUsed: object;
+  binary: Uint8Array;
+  extension: string;
+  size: number;
+};
+type EncoderOptions = {
+  mozjpeg?: Partial<MozJPEGEncodeOptions>;
+  webp?: Partial<WebPEncodeOptions>;
+  avif?: Partial<AvifEncodeOptions>;
+  jxl?: Partial<JxlEncodeOptions>;
+  wp2?: Partial<WP2EncodeOptions>;
+  oxipng?: Partial<OxiPngEncodeOptions>;
+};
+
+async function decodeFile({
+  file,
+}: {
+  file: ArrayBuffer | ArrayLike<number>;
+}): Promise<{ bitmap: ImageData; size: number }> {
+  const array = new Uint8Array(file);
+  const firstChunk = array.slice(0, 16);
+  const firstChunkString = Array.from(firstChunk)
+    .map((v) => String.fromCodePoint(v))
+    .join('');
+  const key = Object.entries(encoders).find(([_name, { detectors }]) =>
+    detectors.some((detector) => detector.exec(firstChunkString)),
+  )?.[0] as EncoderKey | undefined;
+  if (!key) {
+    throw Error(`File has an unsupported format`);
+  }
+  const encoder = encoders[key];
+  const mod = await encoder.dec();
+  const rgba = mod.decode(array);
+  return {
+    bitmap: rgba,
+    size: array.length,
+  };
+}
+
+async function preprocessImage({
+  preprocessorName,
+  options,
+  image,
+}: {
+  preprocessorName: PreprocessorKey;
+  options: any;
+  image: { bitmap: ImageData };
+}) {
+  const preprocessor = await preprocessors[preprocessorName].instantiate();
+  image.bitmap = await preprocessor(
+    Uint8Array.from(image.bitmap.data),
+    image.bitmap.width,
+    image.bitmap.height,
+    options,
+  );
+  return image;
+}
+
+async function encodeImage({
+  bitmap: bitmapIn,
+  encName,
+  encConfig,
+  optimizerButteraugliTarget,
+  maxOptimizerRounds,
+}: {
+  bitmap: ImageData;
+  encName: EncoderKey;
+  encConfig: any;
+  optimizerButteraugliTarget: number;
+  maxOptimizerRounds: number;
+}): Promise<EncodeResult> {
+  let binary: Uint8Array;
+  let optionsUsed = encConfig;
+  const encoder = await encoders[encName].enc();
+  if (encConfig === 'auto') {
+    const optionToOptimize = encoders[encName].autoOptimize.option;
+    const decoder = await encoders[encName].dec();
+    const encode = (bitmapIn: ImageData, quality: number) =>
+      encoder.encode(
+        bitmapIn.data,
+        bitmapIn.width,
+        bitmapIn.height,
+        Object.assign({}, encoders[encName].defaultEncoderOptions as any, {
+          [optionToOptimize]: quality,
+        }),
+      );
+    const decode = (binary: Uint8Array) => decoder.decode(binary);
+    const nonNullEncode = (bitmap: ImageData, quality: number): Uint8Array => {
+      const result = encode(bitmap, quality);
+      if (!result) {
+        throw new Error('There was an error while encoding');
+      }
+      return result;
+    };
+    const { binary: optimizedBinary, quality } = await autoOptimize(
+      bitmapIn,
+      nonNullEncode,
+      decode,
+      {
+        min: encoders[encName].autoOptimize.min,
+        max: encoders[encName].autoOptimize.max,
+        butteraugliDistanceGoal: optimizerButteraugliTarget,
+        maxRounds: maxOptimizerRounds,
+      },
+    );
+    binary = optimizedBinary;
+    optionsUsed = {
+      // 5 significant digits is enough
+      [optionToOptimize]: Math.round(quality * 10000) / 10000,
+    };
+  } else {
+    const result = encoder.encode(
+      bitmapIn.data.buffer,
+      bitmapIn.width,
+      bitmapIn.height,
+      encConfig,
+    );
+
+    if (!result) {
+      throw new Error('There was an error while encoding');
+    }
+
+    binary = result;
+  }
+  return {
+    optionsUsed,
+    binary,
+    extension: encoders[encName].extension,
+    size: binary.length,
+  };
+}
+
+type EncodeParams = { operation: 'encode' } & Parameters<typeof encodeImage>[0];
+type DecodeParams = { operation: 'decode' } & Parameters<typeof decodeFile>[0];
+type PreprocessParams = { operation: 'preprocess' } & Parameters<
+  typeof preprocessImage
+>[0];
+type JobMessage = EncodeParams | DecodeParams | PreprocessParams;
+
+function handleJob(params: JobMessage) {
+  switch (params.operation) {
+    case 'encode':
+      return encodeImage(params);
+    case 'decode':
+      return decodeFile(params);
+    case 'preprocess':
+      return preprocessImage(params);
+    default:
+      throw Error(`Invalid job "${(params as any).operation}"`);
+  }
+}
+
+/**
+ * Represents an ingested image.
+ */
+class Image {
+  public file: ArrayBuffer | ArrayLike<number>;
+  public workerPool: WorkerPool<JobMessage, any>;
+  public decoded: Promise<{ bitmap: ImageData }>;
+  public encodedWith: { [key in EncoderKey]?: EncodeResult };
+
+  constructor(
+    workerPool: WorkerPool<JobMessage, any>,
+    file: ArrayBuffer | ArrayLike<number>,
+  ) {
+    this.file = file;
+    this.workerPool = workerPool;
+    this.decoded = workerPool.dispatchJob({ operation: 'decode', file });
+    this.encodedWith = {};
+  }
+
+  /**
+   * Define one or several preprocessors to use on the image.
+   * @param {PreprocessOptions} preprocessOptions - An object with preprocessors to use, and their settings.
+   * @returns {Promise<undefined>} - A promise that resolves when all preprocessors have completed their work.
+   */
+  async preprocess(preprocessOptions: PreprocessOptions = {}) {
+    for (const [name, options] of Object.entries(preprocessOptions)) {
+      if (!Object.keys(preprocessors).includes(name)) {
+        throw Error(`Invalid preprocessor "${name}"`);
+      }
+      const preprocessorName = name as PreprocessorKey;
+      const preprocessorOptions = Object.assign(
+        {},
+        preprocessors[preprocessorName].defaultOptions,
+        options,
+      );
+      this.decoded = this.workerPool.dispatchJob({
+        operation: 'preprocess',
+        preprocessorName,
+        image: await this.decoded,
+        options: preprocessorOptions,
+      });
+      await this.decoded;
+    }
+  }
+
+  /**
+   * Define one or several encoders to use on the image.
+   * @param {object} encodeOptions - An object with encoders to use, and their settings.
+   * @returns {Promise<{ [key in keyof T]: EncodeResult }>} - A promise that resolves when the image has been encoded with all the specified encoders.
+   */
+  async encode<T extends EncoderOptions>(
+    encodeOptions: {
+      optimizerButteraugliTarget?: number;
+      maxOptimizerRounds?: number;
+    } & T,
+  ): Promise<{ [key in keyof T]: EncodeResult }> {
+    const { bitmap } = await this.decoded;
+    const setEncodedWithPromises = [];
+    for (const [name, options] of Object.entries(encodeOptions)) {
+      if (!Object.keys(encoders).includes(name)) {
+        continue;
+      }
+      const encName = name as EncoderKey;
+      const encRef = encoders[encName];
+      const encConfig =
+        typeof options === 'string'
+          ? options
+          : Object.assign({}, encRef.defaultEncoderOptions, options);
+      setEncodedWithPromises.push(
+        this.workerPool
+          .dispatchJob({
+            operation: 'encode',
+            bitmap,
+            encName,
+            encConfig,
+            optimizerButteraugliTarget: Number(
+              encodeOptions.optimizerButteraugliTarget ?? 1.4,
+            ),
+            maxOptimizerRounds: Number(encodeOptions.maxOptimizerRounds ?? 6),
+          })
+          .then((encodeResult) => {
+            this.encodedWith[encName] = encodeResult;
+          }),
+      );
+    }
+
+    await Promise.all(setEncodedWithPromises);
+    return this.encodedWith as { [key in keyof T]: EncodeResult };
+  }
+}
+
+/**
+ * A pool where images can be ingested and squooshed.
+ */
+class ImagePool {
+  public workerPool: WorkerPool<JobMessage, any>;
+
+  /**
+   * Create a new pool.
+   * @param {number} [threads] - Number of concurrent image processes to run in the pool.
+   */
+  constructor(threads: number) {
+    this.workerPool = new WorkerPool(threads, __filename);
+  }
+
+  /**
+   * Ingest an image into the image pool.
+   * @param {ArrayBuffer | ArrayLike<number>} file - The image that should be ingested and decoded.
+   * @returns {Image} - A custom class reference to the decoded image.
+   */
+  ingestImage(file: ArrayBuffer | ArrayLike<number>): Image {
+    return new Image(this.workerPool, file);
+  }
+
+  /**
+   * Closes the underlying image processing pipeline. The already processed images will still be there, but no new processing can start.
+   * @returns {Promise<void>} - A promise that resolves when the underlying pipeline has closed.
+   */
+  async close(): Promise<void> {
+    await this.workerPool.join();
+  }
+}
+
+if (!isMainThread) {
+  WorkerPool.useThisThreadAsWorker(handleJob);
+}

libsquoosh/src/missing-types.d.ts

@@ -23,6 +23,11 @@ declare module 'asset-url:../../codecs/resize/pkg/squoosh_resize_bg.wasm' {
   export default value;
 }
 
+declare module 'chunk-url:../../codecs/avif/enc/avif_node_enc_mt.worker.js' {
+  const value: string;
+  export default value;
+}
+
 // These don't exist in NodeJS types so we're not able to use them but they are referenced in some emscripten and codec types
 // Thus, we need to explicitly assign them to be `never`
 // We're also not able to use the APIs that use these types

libsquoosh/src/worker_pool.ts

@@ -7,26 +7,19 @@ function uuid() {
   ).join('');
 }
 
-function jobPromise(worker, msg) {
-  return new Promise((resolve, reject) => {
-    const id = uuid();
-    worker.postMessage({ msg, id });
-    worker.on('message', function f({ error, result, id: rid }) {
-      if (rid !== id) {
-        return;
-      }
-      if (error) {
-        reject(error);
-        return;
-      }
-      worker.off('message', f);
-      resolve(result);
-    });
-  });
+interface Job<I> {
+  msg: I;
+  resolve: Function;
+  reject: Function;
 }
 
-export default class WorkerPool {
-  constructor(numWorkers, workerFile) {
+export default class WorkerPool<I, O> {
+  public numWorkers: number;
+  public jobQueue: TransformStream<Job<I>, Job<I>>;
+  public workerQueue: TransformStream<Worker, Worker>;
+  public done: Promise<void>;
+
+  constructor(numWorkers: number, workerFile: string) {
     this.numWorkers = numWorkers;
     this.jobQueue = new TransformStream();
     this.workerQueue = new TransformStream();
@@ -48,9 +41,14 @@ export default class WorkerPool {
         await this._terminateAll();
         return;
       }
+
+      if (!value) {
+        throw new Error('Reader did not return any value');
+      }
+
       const { msg, resolve, reject } = value;
       const worker = await this._nextWorker();
-      jobPromise(worker, msg)
+      this.jobPromise(worker, msg)
         .then((result) => resolve(result))
         .catch((reason) => reject(reason))
         .finally(() => {
@@ -64,8 +62,12 @@ export default class WorkerPool {
 
   async _nextWorker() {
     const reader = this.workerQueue.readable.getReader();
-    const { value, done } = await reader.read();
+    const { value } = await reader.read();
     reader.releaseLock();
+    if (!value) {
+      throw new Error('No worker left');
+    }
+
     return value;
   }
 
@@ -82,7 +84,7 @@ export default class WorkerPool {
     await this.done;
   }
 
-  dispatchJob(msg) {
+  dispatchJob(msg: I): Promise<O> {
     return new Promise((resolve, reject) => {
       const writer = this.jobQueue.writable.getWriter();
       writer.write({ msg, resolve, reject });
@@ -90,14 +92,32 @@ export default class WorkerPool {
     });
   }
 
-  static useThisThreadAsWorker(cb) {
-    parentPort.on('message', async (data) => {
+  private jobPromise(worker: Worker, msg: I) {
+    return new Promise((resolve, reject) => {
+      const id = uuid();
+      worker.postMessage({ msg, id });
+      worker.on('message', function f({ error, result, id: rid }) {
+        if (rid !== id) {
+          return;
+        }
+        if (error) {
+          reject(error);
+          return;
+        }
+        worker.off('message', f);
+        resolve(result);
+      });
+    });
+  }
+
+  static useThisThreadAsWorker<I, O>(cb: (msg: I) => O) {
+    parentPort!.on('message', async (data) => {
       const { msg, id } = data;
       try {
         const result = await cb(msg);
-        parentPort.postMessage({ result, id });
+        parentPort!.postMessage({ result, id });
       } catch (e) {
-        parentPort.postMessage({ error: e.message, id });
+        parentPort!.postMessage({ error: e.message, id });
       }
     });
   }

missing-types.d.ts

@@ -44,6 +44,11 @@ declare module 'data-url:*' {
   export default url;
 }
 
+declare module 'data-url-text:*' {
+  const url: string;
+  export default url;
+}
+
 declare module 'service-worker:*' {
   const url: string;
   export default url;

package.json

@@ -6,9 +6,10 @@
   "scripts": {
     "build": "rollup -c && node lib/move-output.js",
     "debug": "node --inspect-brk node_modules/.bin/rollup -c",
-    "dev": "run-p watch serve",
+    "dev": "DEV_PORT=\"${DEV_PORT:=5000}\" run-p watch serve",
     "watch": "rollup -cw",
-    "serve": "serve --config ../../../serve.json .tmp/build/static"
+    "serve": "serve --listen=$DEV_PORT --config ../../../serve.json .tmp/build/static",
+    "prepare": "husky install"
   },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^17.0.0",
@@ -16,15 +17,15 @@
     "@rollup/plugin-replace": "^2.3.4",
     "@surma/rollup-plugin-off-main-thread": "^2.2.2",
     "@types/dedent": "^0.7.0",
-    "@types/mime-types": "^2.1.0",
-    "@types/node": "^14.14.7",
+    "@types/mime-types": "^2.1.1",
+    "@types/node": "^16.11.1",
     "@web/rollup-plugin-import-meta-assets": "^1.0.6",
     "comlink": "^4.3.0",
     "cssnano": "^4.1.10",
     "dedent": "^0.7.0",
     "del": "^5.1.0",
     "file-drop-element": "^1.0.1",
-    "husky": "^4.3.0",
+    "husky": "^7.0.2",
     "idb-keyval": "^3.2.0",
     "image-size": "^0.9.3",
     "linkstate": "^2.0.0",
@@ -32,7 +33,7 @@
     "lodash.camelcase": "^4.3.0",
     "mime-types": "^2.1.28",
     "npm-run-all": "^4.1.5",
-    "pointer-tracker": "^2.4.0",
+    "pointer-tracker": "^2.5.3",
     "postcss": "^7.0.35",
     "postcss-modules": "^3.2.2",
     "postcss-nested": "^4.2.3",
@@ -40,24 +41,20 @@
     "postcss-url": "^8.0.0",
     "preact": "^10.5.5",
     "preact-render-to-string": "^5.1.11",
-    "prettier": "^2.1.2",
+    "prettier": "^2.4.1",
     "rollup": "^2.38.0",
     "rollup-plugin-terser": "^7.0.2",
     "serve": "^11.3.2",
-    "typescript": "^4.1.3",
+    "typescript": "^4.4.4",
     "which": "^2.0.2"
   },
-  "husky": {
-    "hooks": {
-      "pre-commit": "lint-staged"
-    }
-  },
   "lint-staged": {
     "*.{js,css,json,md,ts,tsx}": "prettier --write",
     "*.{c,h,cpp,hpp}": "clang-format -i",
     "*.rs": "rustfmt"
   },
   "dependencies": {
+    "strict-csp": "^1.0.4",
     "wasm-feature-detect": "^1.2.11"
   }
 }

src/client/initial-app/index.tsx

@@ -37,8 +37,10 @@ main();
   ga('set', 'transport', 'beacon');
   ga('set', 'dimension1', displayMode);
   ga('send', 'pageview', '/index.html', { title: 'Squoosh' });
-  // Load the GA script
-  const script = document.createElement('script');
-  script.src = 'https://www.google-analytics.com/analytics.js';
-  document.head.appendChild(script);
+  // Load the GA script without keeping the browser spinner going.
+  addEventListener('load', () => {
+    const script = document.createElement('script');
+    script.src = 'https://www.google-analytics.com/analytics.js';
+    document.head.appendChild(script);
+  });
 }

src/client/lazy-app/Compress/Options/Range/custom-els/RangeInput/index.ts

@@ -20,7 +20,7 @@ const REFLECTED_ATTRIBUTES = [
   'disabled',
 ];
 
-function getPrescision(value: string): number {
+function getPrecision(value: string): number {
   const afterDecimal = value.split('.')[1];
   return afterDecimal ? afterDecimal.length : 0;
 }
@@ -112,18 +112,24 @@ class RangeInputElement extends HTMLElement {
     this.dispatchEvent(retargetted);
   };
 
+  private _getDisplayValue(value: number): string {
+    if (value >= 10000) return (value / 1000).toFixed(1) + 'k';
+
+    const labelPrecision =
+      Number(this.labelPrecision) || getPrecision(this.step) || 0;
+    return labelPrecision
+      ? value.toFixed(labelPrecision)
+      : Math.round(value).toString();
+  }
+
   private _update = () => {
     // Not connected?
     if (!this._valueDisplay) return;
     const value = Number(this.value) || 0;
     const min = Number(this.min) || 0;
     const max = Number(this.max) || 100;
-    const labelPrecision =
-      Number(this.labelPrecision) || getPrescision(this.step) || 0;
     const percent = (100 * (value - min)) / (max - min);
-    const displayValue = labelPrecision
-      ? value.toFixed(labelPrecision)
-      : Math.round(value).toString();
+    const displayValue = this._getDisplayValue(value);
 
     this._valueDisplay!.textContent = displayValue;
     this.style.setProperty('--value-percent', percent + '%');

src/client/lazy-app/Compress/Options/Range/style.css

@@ -35,7 +35,7 @@
   text-decoration-style: dotted;
   text-decoration-color: var(--main-theme-color);
   text-underline-position: under;
-  width: 48px;
+  width: 54px;
   position: relative;
   left: 5px;
 

src/client/lazy-app/Compress/Options/index.tsx

@@ -40,24 +40,23 @@ type PartialButNotUndefined<T> = {
   [P in keyof T]: T[P];
 };
 
-const supportedEncoderMapP: Promise<PartialButNotUndefined<
-  typeof encoderMap
->> = (async () => {
-  const supportedEncoderMap: PartialButNotUndefined<typeof encoderMap> = {
-    ...encoderMap,
-  };
+const supportedEncoderMapP: Promise<PartialButNotUndefined<typeof encoderMap>> =
+  (async () => {
+    const supportedEncoderMap: PartialButNotUndefined<typeof encoderMap> = {
+      ...encoderMap,
+    };
 
-  // Filter out entries where the feature test fails
-  await Promise.all(
-    Object.entries(encoderMap).map(async ([encoderName, details]) => {
-      if ('featureTest' in details && !(await details.featureTest())) {
-        delete supportedEncoderMap[encoderName as keyof typeof encoderMap];
-      }
-    }),
-  );
+    // Filter out entries where the feature test fails
+    await Promise.all(
+      Object.entries(encoderMap).map(async ([encoderName, details]) => {
+        if ('featureTest' in details && !(await details.featureTest())) {
+          delete supportedEncoderMap[encoderName as keyof typeof encoderMap];
+        }
+      }),
+    );
 
-  return supportedEncoderMap;
-})();
+    return supportedEncoderMap;
+  })();
 
 export default class Options extends Component<Props, State> {
   state: State = {

src/client/lazy-app/Compress/Options/style.css

@@ -1,6 +1,7 @@
 .options-scroller {
   --horizontal-padding: 15px;
   border-radius: var(--scroller-radius);
+  overflow: hidden;
 
   /* At smaller widths, the multi-panel handles the scrolling */
   @media (min-width: 600px) {

src/client/lazy-app/Compress/Output/custom-els/PinchZoom/index.ts

@@ -1,5 +1,6 @@
 import PointerTracker, { Pointer } from 'pointer-tracker';
 import 'add-css:./styles.css';
+import { isSafari } from 'client/lazy-app/util';
 
 interface Point {
   clientX: number;
@@ -81,6 +82,7 @@ function createPoint(): SVGPoint {
 }
 
 const MIN_SCALE = 0.01;
+const MAX_SCALE = 100000;
 
 export default class PinchZoom extends HTMLElement {
   // The element that we'll transform.
@@ -104,14 +106,23 @@ export default class PinchZoom extends HTMLElement {
     const pointerTracker: PointerTracker = new PointerTracker(this, {
       start: (pointer, event) => {
         // We only want to track 2 pointers at most
-        if (pointerTracker.currentPointers.length === 2 || !this._positioningEl)
+        if (
+          pointerTracker.currentPointers.length === 2 ||
+          !this._positioningEl
+        ) {
           return false;
+        }
         event.preventDefault();
         return true;
       },
       move: (previousPointers) => {
         this._onPointerMove(previousPointers, pointerTracker.currentPointers);
       },
+      // Unfortunately Safari on iOS has a bug where pointer event capturing
+      // doesn't work in some cases, and we hit those cases due to our event
+      // retargeting in pinch-zoom.
+      // https://bugs.webkit.org/show_bug.cgi?id=220196
+      avoidPointerEvents: isSafari,
     });
 
     this.addEventListener('wheel', (event) => this._onWheel(event));
@@ -244,6 +255,9 @@ export default class PinchZoom extends HTMLElement {
     // Avoid scaling to zero
     if (scale < MIN_SCALE) return;
 
+    // Avoid scaling to very large values
+    if (scale > MAX_SCALE) return;
+
     // Return if there's no change
     if (scale === this.scale && x === this.x && y === this.y) return;
 
@@ -296,9 +310,13 @@ export default class PinchZoom extends HTMLElement {
       deltaY *= 15;
     }
 
+    const zoomingOut = deltaY > 0;
+
     // ctrlKey is true when pinch-zooming on a trackpad.
     const divisor = ctrlKey ? 100 : 300;
-    const scaleDiff = 1 - deltaY / divisor;
+    // when zooming out, invert the delta and the ratio to keep zoom stable
+    const ratio = 1 - (zoomingOut ? -deltaY : deltaY) / divisor;
+    const scaleDiff = zoomingOut ? 1 / ratio : ratio;
 
     this._applyChange({
       scaleDiff,

src/client/lazy-app/Compress/Output/index.tsx

@@ -5,8 +5,10 @@ import './custom-els/PinchZoom';
 import './custom-els/TwoUp';
 import * as style from './style.css';
 import 'add-css:./style.css';
-import { shallowEqual } from '../../util';
+import { shallowEqual, isSafari } from '../../util';
 import {
+  ToggleAliasingIcon,
+  ToggleAliasingActiveIcon,
   ToggleBackgroundIcon,
   AddIcon,
   RemoveIcon,
@@ -19,7 +21,6 @@ import { cleanSet } from '../../util/clean-modify';
 import type { SourceImage } from '../../Compress';
 import { linkRef } from 'shared/prerendered-app/util';
 import { drawDataToCanvas } from 'client/lazy-app/util/canvas';
-
 interface Props {
   source?: SourceImage;
   preprocessorState?: PreprocessorState;
@@ -35,6 +36,7 @@ interface State {
   scale: number;
   editingScale: boolean;
   altBackground: boolean;
+  aliasing: boolean;
 }
 
 const scaleToOpts: ScaleToOpts = {
@@ -49,6 +51,7 @@ export default class Output extends Component<Props, State> {
     scale: 1,
     editingScale: false,
     altBackground: false,
+    aliasing: false,
   };
   canvasLeft?: HTMLCanvasElement;
   canvasRight?: HTMLCanvasElement;
@@ -145,6 +148,12 @@ export default class Output extends Component<Props, State> {
     return props.rightCompressed || (props.source && props.source.preprocessed);
   }
 
+  private toggleAliasing = () => {
+    this.setState((state) => ({
+      aliasing: !state.aliasing,
+    }));
+  };
+
   private toggleBackground = () => {
     this.setState({
       altBackground: !this.state.altBackground,
@@ -255,7 +264,7 @@ export default class Output extends Component<Props, State> {
 
   render(
     { mobileView, leftImgContain, rightImgContain, source }: Props,
-    { scale, editingScale, altBackground }: State,
+    { scale, editingScale, altBackground, aliasing }: State,
   ) {
     const leftDraw = this.leftDrawable();
     const rightDraw = this.rightDrawable();
@@ -275,7 +284,11 @@ export default class Output extends Component<Props, State> {
             onTouchStartCapture={this.onRetargetableEvent}
             onTouchEndCapture={this.onRetargetableEvent}
             onTouchMoveCapture={this.onRetargetableEvent}
-            onPointerDownCapture={this.onRetargetableEvent}
+            onPointerDownCapture={
+              // We avoid pointer events in our PinchZoom due to a Safari bug.
+              // That means we also need to avoid them here too, else we end up preventing the fallback mouse events.
+              isSafari ? undefined : this.onRetargetableEvent
+            }
             onMouseDownCapture={this.onRetargetableEvent}
             onWheelCapture={this.onRetargetableEvent}
           >
@@ -285,7 +298,9 @@ export default class Output extends Component<Props, State> {
               ref={linkRef(this, 'pinchZoomLeft')}
             >
               <canvas
-                class={style.pinchTarget}
+                class={`${style.pinchTarget} ${
+                  aliasing ? style.pixelated : ''
+                }`}
                 ref={linkRef(this, 'canvasLeft')}
                 width={leftDraw && leftDraw.width}
                 height={leftDraw && leftDraw.height}
@@ -301,7 +316,9 @@ export default class Output extends Component<Props, State> {
               ref={linkRef(this, 'pinchZoomRight')}
             >
               <canvas
-                class={style.pinchTarget}
+                class={`${style.pinchTarget} ${
+                  aliasing ? style.pixelated : ''
+                }`}
                 ref={linkRef(this, 'canvasRight')}
                 width={rightDraw && rightDraw.width}
                 height={rightDraw && rightDraw.height}
@@ -345,10 +362,31 @@ export default class Output extends Component<Props, State> {
             </button>
           </div>
           <div class={style.buttonGroup}>
-            <button class={style.firstButton} onClick={this.onRotateClick}>
+            <button
+              class={style.firstButton}
+              onClick={this.onRotateClick}
+              title="Rotate"
+            >
               <RotateIcon />
             </button>
-            <button class={style.lastButton} onClick={this.toggleBackground}>
+            {!isSafari && (
+              <button
+                class={style.button}
+                onClick={this.toggleAliasing}
+                title="Toggle smoothing"
+              >
+                {aliasing ? (
+                  <ToggleAliasingActiveIcon />
+                ) : (
+                  <ToggleAliasingIcon />
+                )}
+              </button>
+            )}
+            <button
+              class={style.lastButton}
+              onClick={this.toggleBackground}
+              title="Toggle background"
+            >
               {altBackground ? (
                 <ToggleBackgroundActiveIcon />
               ) : (

src/client/lazy-app/Compress/Output/style.css

@@ -86,8 +86,7 @@
   font-size: 1.2rem;
   cursor: pointer;
 
-  &:focus {
-    /* box-shadow: 0 0 0 2px var(--hot-pink); */
+  &:focus-visible {
     box-shadow: 0 0 0 2px #fff;
     outline: none;
     z-index: 1;
@@ -161,3 +160,8 @@ input.zoom {
     pointer-events: auto;
   }
 }
+
+.pixelated {
+  image-rendering: crisp-edges;
+  image-rendering: pixelated;
+}

src/client/lazy-app/Compress/index.tsx

@@ -116,7 +116,7 @@ async function decodeImage(
     // Otherwise fall through and try built-in decoding for a laugh.
     return await builtinDecode(signal, blob, mimeType);
   } catch (err) {
-    if (err.name === 'AbortError') throw err;
+    if (err instanceof Error && err.name === 'AbortError') throw err;
     console.log(err);
     throw Error("Couldn't decode image");
   }
@@ -481,7 +481,7 @@ export default class Compress extends Component<Props, State> {
         open('https://github.com/GoogleChromeLabs/squoosh/tree/dev/cli');
       }
     } catch (e) {
-      this.props.showSnack(e);
+      this.props.showSnack(String(e));
     }
   };
 
@@ -640,7 +640,7 @@ export default class Compress extends Component<Props, State> {
           return { sides };
         });
       } catch (err) {
-        if (err.name === 'AbortError') return;
+        if (err instanceof Error && err.name === 'AbortError') return;
         this.props.showSnack(`Source decoding error: ${err}`);
         throw err;
       }
@@ -698,7 +698,7 @@ export default class Compress extends Component<Props, State> {
           return newState;
         });
       } catch (err) {
-        if (err.name === 'AbortError') return;
+        if (err instanceof Error && err.name === 'AbortError') return;
         this.setState({ loading: false });
         this.props.showSnack(`Preprocessing error: ${err}`);
         throw err;
@@ -822,7 +822,7 @@ export default class Compress extends Component<Props, State> {
 
         this.activeSideJobs[sideIndex] = undefined;
       } catch (err) {
-        if (err.name === 'AbortError') return;
+        if (err instanceof Error && err.name === 'AbortError') return;
         this.setState((currentState) => {
           const sides = cleanMerge(currentState.sides, sideIndex, {
             loading: false,

src/client/lazy-app/icons/index.tsx

@@ -11,6 +11,25 @@ const Icon = (props: preact.JSX.HTMLAttributes) => (
   />
 );
 
+export const ToggleAliasingIcon = (props: preact.JSX.HTMLAttributes) => (
+  <Icon {...props}>
+    <circle
+      cx="12"
+      cy="12"
+      r="8"
+      fill="none"
+      stroke="currentColor"
+      stroke-width="2"
+    />
+  </Icon>
+);
+
+export const ToggleAliasingActiveIcon = (props: preact.JSX.HTMLAttributes) => (
+  <Icon {...props}>
+    <path d="M12 3h5v2h2v2h2v5h-2V9h-2V7h-2V5h-3V3M21 12v5h-2v2h-2v2h-5v-2h3v-2h2v-2h2v-3h2M12 21H7v-2H5v-2H3v-5h2v3h2v2h2v2h3v2M3 12V7h2V5h2V3h5v2H9v2H7v2H5v3H3" />
+  </Icon>
+);
+
 export const ToggleBackgroundIcon = (props: preact.JSX.HTMLAttributes) => (
   <Icon {...props}>
     <path d="M3 13h2v-2H3v2zm0 4h2v-2H3v2zm2 4v-2H3c0 1.1.9 2 2 2zM3 9h2V7H3v2zm12 12h2v-2h-2v2zm4-18H9a2 2 0 0 0-2 2v10c0 1.1.9 2 2 2h10a2 2 0 0 0 2-2V5a2 2 0 0 0-2-2zm0 12H9V5h10v10zm-8 6h2v-2h-2v2zm-4 0h2v-2H7v2z" />

src/client/lazy-app/util/index.ts

@@ -14,6 +14,11 @@
 import * as WebCodecs from '../util/web-codecs';
 import { drawableToImageData } from './canvas';
 
+/** If render engine is Safari */
+export const isSafari =
+  /Safari\//.test(navigator.userAgent) &&
+  !/Chrom(e|ium)\//.test(navigator.userAgent);
+
 /**
  * Compare two objects, returning a boolean indicating if
  * they have the same properties and strictly equal values.

src/features/encoders/jxl/client/index.tsx

@@ -29,10 +29,9 @@ interface State {
   slightLoss: boolean;
   autoEdgePreservingFilter: boolean;
   decodingSpeedTier: number;
+  photonNoiseIso: number;
 }
 
-const maxSpeed = 7;
-
 export class Options extends Component<Props, State> {
   static getDerivedStateFromProps(
     props: Props,
@@ -47,7 +46,7 @@ export class Options extends Component<Props, State> {
     // Create default form state from options
     return {
       options,
-      effort: maxSpeed - options.speed,
+      effort: options.effort,
       quality: options.quality,
       progressive: options.progressive,
       edgePreservingFilter: options.epf === -1 ? 2 : options.epf,
@@ -55,6 +54,7 @@ export class Options extends Component<Props, State> {
       slightLoss: options.lossyPalette,
       autoEdgePreservingFilter: options.epf === -1,
       decodingSpeedTier: options.decodingSpeedTier,
+      photonNoiseIso: options.photonNoiseIso,
     };
   }
 
@@ -87,15 +87,15 @@ export class Options extends Component<Props, State> {
         };
 
         const newOptions: EncodeOptions = {
-          speed: maxSpeed - optionState.effort,
+          effort: optionState.effort,
           quality: optionState.lossless ? 100 : optionState.quality,
           progressive: optionState.progressive,
           epf: optionState.autoEdgePreservingFilter
             ? -1
             : optionState.edgePreservingFilter,
-          nearLossless: 0,
           lossyPalette: optionState.lossless ? optionState.slightLoss : false,
           decodingSpeedTier: optionState.decodingSpeedTier,
+          photonNoiseIso: optionState.photonNoiseIso,
         };
 
         // Updating options, so we don't recalculate in getDerivedStateFromProps.
@@ -121,6 +121,7 @@ export class Options extends Component<Props, State> {
       slightLoss,
       autoEdgePreservingFilter,
       decodingSpeedTier,
+      photonNoiseIso,
     }: State,
   ) {
     // I'm rendering both lossy and lossless forms, as it becomes much easier when
@@ -164,7 +165,6 @@ export class Options extends Component<Props, State> {
               <label class={style.optionToggle}>
                 Auto edge filter
                 <Checkbox
-                  name="autoEdgeFilter"
                   checked={autoEdgePreservingFilter}
                   onChange={this._inputChange(
                     'autoEdgePreservingFilter',
@@ -199,6 +199,17 @@ export class Options extends Component<Props, State> {
                   Optimise for decoding speed (worse compression):
                 </Range>
               </div>
+              <div class={style.optionOneCell}>
+                <Range
+                  min="0"
+                  max="50000"
+                  step="100"
+                  value={photonNoiseIso}
+                  onInput={this._inputChange('photonNoiseIso', 'number')}
+                >
+                  Noise equivalent to ISO:
+                </Range>
+              </div>
             </div>
           )}
         </Expander>
@@ -212,8 +223,8 @@ export class Options extends Component<Props, State> {
         </label>
         <div class={style.optionOneCell}>
           <Range
-            min="0"
-            max={maxSpeed - 1}
+            min="3"
+            max="9"
             value={effort}
             onInput={this._inputChange('effort', 'number')}
           >

src/features/encoders/jxl/shared/meta.ts

@@ -18,11 +18,11 @@ export const label = 'JPEG XL (beta)';
 export const mimeType = 'image/jxl';
 export const extension = 'jxl';
 export const defaultOptions: EncodeOptions = {
-  speed: 4,
+  effort: 7,
   quality: 75,
   progressive: false,
   epf: -1,
-  nearLossless: 0,
   lossyPalette: false,
   decodingSpeedTier: 0,
+  photonNoiseIso: 0,
 };

src/features/encoders/oxiPNG/worker/oxipngEncode.ts

@@ -14,9 +14,11 @@ import { EncodeOptions } from '../shared/meta';
 import { threads } from 'wasm-feature-detect';
 
 async function initMT() {
-  const { default: init, initThreadPool, optimise } = await import(
-    'codecs/oxipng/pkg-parallel/squoosh_oxipng'
-  );
+  const {
+    default: init,
+    initThreadPool,
+    optimise,
+  } = await import('codecs/oxipng/pkg-parallel/squoosh_oxipng');
   await init();
   await initThreadPool(navigator.hardwareConcurrency);
   return optimise;

src/shared/custom-els/loading-spinner/index.ts

@@ -2,9 +2,9 @@ import * as styles from './styles.css';
 import 'add-css:./styles.css';
 
 // So it doesn't cause an error when running in node
-const HTMLEl = ((__PRERENDER__
+const HTMLEl = (__PRERENDER__
   ? Object
-  : HTMLElement) as unknown) as typeof HTMLElement;
+  : HTMLElement) as unknown as typeof HTMLElement;
 
 /**
  * A simple spinner. This custom element has no JS API. Just put it in the document, and it'll

src/shared/custom-els/snack-bar/index.ts

@@ -2,9 +2,9 @@ import * as style from './styles.css';
 import 'add-css:./styles.css';
 
 // So it doesn't cause an error when running in node
-const HTMLEl = ((__PRERENDER__
+const HTMLEl = (__PRERENDER__
   ? Object
-  : HTMLElement) as unknown) as typeof HTMLElement;
+  : HTMLElement) as unknown as typeof HTMLElement;
 
 export interface SnackOptions {
   timeout?: number;

src/shared/missing-types.d.ts

@@ -13,24 +13,3 @@
 /// <reference path="../../missing-types.d.ts" />
 
 declare const __PRERENDER__: boolean;
-
-type ResizeObserverCallback = (
-  entries: ResizeObserverEntry[],
-  observer: ResizeObserver,
-) => void;
-
-interface ResizeObserverEntry {
-  readonly target: Element;
-  readonly contentRect: DOMRectReadOnly;
-}
-
-interface ResizeObserver {
-  observe(target: Element): void;
-  unobserve(target: Element): void;
-  disconnect(): void;
-}
-
-declare var ResizeObserver: {
-  prototype: ResizeObserver;
-  new (callback: ResizeObserverCallback): ResizeObserver;
-};

src/shared/prerendered-app/Intro/SlideOnScroll/index.tsx

@@ -0,0 +1,51 @@
+import { h, Component, RenderableProps } from 'preact';
+
+interface Props {}
+interface State {}
+
+export default class SlideOnScroll extends Component<Props, State> {
+  private observer?: IntersectionObserver;
+
+  componentDidMount() {
+    if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return;
+
+    const base = this.base as HTMLElement;
+    let wasOutOfView = false;
+
+    this.observer = new IntersectionObserver(
+      (entries, observer) => {
+        for (const entry of entries) {
+          if (!entry.isIntersecting) {
+            wasOutOfView = true;
+            base.style.opacity = '0';
+            return;
+          }
+
+          // Only transition in if the element was at some point out of view.
+          if (wasOutOfView) {
+            base.style.opacity = '';
+            base.animate(
+              { offset: 0, opacity: '0', transform: 'translateY(40px)' },
+              { duration: 300, easing: 'ease' },
+            );
+          }
+          observer.unobserve(entry.target);
+        }
+      },
+      { threshold: 0.2 },
+    );
+
+    this.observer.observe(base);
+  }
+
+  componentWillUnmount() {
+    // Have to manually disconnect due to memory leaks in browsers.
+    // One day we'll be able to remove this, and the private property.
+    // https://twitter.com/jaffathecake/status/1405437361643790337
+    if (this.observer) this.observer.disconnect();
+  }
+
+  render({ children }: RenderableProps<Props>) {
+    return <div>{children}</div>;
+  }
+}

src/shared/prerendered-app/Intro/imgs/info-content/secure.svg

@@ -0,0 +1 @@
+<svg width="498" height="333" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M401.17 125.52C387.072 53.923 324.253.173 248.787.173c-59.916 0-111.954 34.035-137.869 83.841C48.513 90.655 0 143.574 0 207.7c0 68.692 55.77 124.516 124.394 124.516h269.519c57.221 0 103.662-46.486 103.662-103.763 0-54.787-42.502-99.198-96.405-102.933z" fill="#91D3FF" fill-opacity=".3"/><path d="M187.247 121.321l-3.987-3.987-3.481 4.434c-11.519 14.67-18.366 33.15-18.366 53.242 0 48.003 38.882 86.885 86.885 86.885 20.091 0 38.572-6.848 53.242-18.366l4.434-3.482-3.987-3.986-114.74-114.74zM309.348 228.7l3.987 3.986 3.481-4.434c11.519-14.669 18.366-33.15 18.366-53.242 0-48.002-38.882-86.884-86.884-86.884-20.092 0-38.573 6.847-53.242 18.365l-4.435 3.482 3.987 3.986L309.348 228.7zm-158.406-53.69c0-53.739 43.617-97.355 97.356-97.355 53.738 0 97.355 43.616 97.355 97.355 0 53.739-43.617 97.356-97.355 97.356-53.739 0-97.356-43.617-97.356-97.356z" fill="#FF3385" stroke="#FF3385" stroke-width="10"/></svg>

src/shared/prerendered-app/Intro/index.tsx

@@ -10,12 +10,16 @@ import deviceScreen from 'url:./imgs/demos/demo-device-screen.png';
 import largePhotoIcon from 'url:./imgs/demos/icon-demo-large-photo.jpg';
 import artworkIcon from 'url:./imgs/demos/icon-demo-artwork.jpg';
 import deviceScreenIcon from 'url:./imgs/demos/icon-demo-device-screen.jpg';
+import smallSectionAsset from 'url:./imgs/info-content/small.svg';
+import simpleSectionAsset from 'url:./imgs/info-content/simple.svg';
+import secureSectionAsset from 'url:./imgs/info-content/secure.svg';
 import logoIcon from 'url:./imgs/demos/icon-demo-logo.png';
-import logoWithText from 'url:./imgs/logo-with-text.svg';
+import logoWithText from 'data-url-text:./imgs/logo-with-text.svg';
 import * as style from './style.css';
 import type SnackBarElement from 'shared/custom-els/snack-bar';
 import 'shared/custom-els/snack-bar';
 import { startBlobs } from './blob-anim/meta';
+import SlideOnScroll from './SlideOnScroll';
 
 const demos = [
   {
@@ -336,37 +340,125 @@ export default class Intro extends Component<Props, State> {
             </ul>
           </div>
         </div>
-        <div class={style.footer}>
+
+        <div class={style.bottomWave}>
           <svg viewBox="0 0 1920 79" class={style.topWave}>
             <path
               d="M0 59l64-11c64-11 192-34 320-43s256-5 384 4 256 23 384 34 256 21 384 14 256-30 320-41l64-11v94H0z"
-              class={style.footerWave}
+              class={style.infoWave}
             />
           </svg>
-          <div class={style.contentPadding}>
-            <footer class={style.footerItems}>
-              <a
-                class={style.footerLink}
-                href="https://github.com/GoogleChromeLabs/squoosh/blob/dev/README.md#privacy"
-              >
-                Privacy
-              </a>
-              <a
-                class={style.footerLink}
-                href="https://github.com/GoogleChromeLabs/squoosh/tree/dev/cli"
-              >
-                Squoosh CLI
-              </a>
-              <a
-                class={style.footerLinkWithLogo}
-                href="https://github.com/GoogleChromeLabs/squoosh"
-              >
-                <img src={githubLogo} alt="" width="10" height="10" />
-                Source on Github
-              </a>
-            </footer>
-          </div>
         </div>
+
+        <section class={style.info}>
+          <div class={style.infoContainer}>
+            <SlideOnScroll>
+              <div class={style.infoContent}>
+                <div class={style.infoTextWrapper}>
+                  <h2 class={style.infoTitle}>Small</h2>
+                  <p class={style.infoCaption}>
+                    Smaller images mean faster load times. Squoosh can reduce
+                    file size and maintain high quality.
+                  </p>
+                </div>
+                <div class={style.infoImgWrapper}>
+                  <img
+                    class={style.infoImg}
+                    src={smallSectionAsset}
+                    alt="silhouette of a large 1.4 megabyte image shrunk into a smaller 80 kilobyte image"
+                    width="536"
+                    height="522"
+                  />
+                </div>
+              </div>
+            </SlideOnScroll>
+          </div>
+        </section>
+
+        <section class={style.info}>
+          <div class={style.infoContainer}>
+            <SlideOnScroll>
+              <div class={style.infoContent}>
+                <div class={style.infoTextWrapper}>
+                  <h2 class={style.infoTitle}>Simple</h2>
+                  <p class={style.infoCaption}>
+                    Open your image, inspect the differences, then save
+                    instantly. Feeling adventurous? Adjust the settings for even
+                    smaller files.
+                  </p>
+                </div>
+                <div class={style.infoImgWrapper}>
+                  <img
+                    class={style.infoImg}
+                    src={simpleSectionAsset}
+                    alt="grid of multiple shrunk images displaying various options"
+                    width="538"
+                    height="384"
+                  />
+                </div>
+              </div>
+            </SlideOnScroll>
+          </div>
+        </section>
+
+        <section class={style.info}>
+          <div class={style.infoContainer}>
+            <SlideOnScroll>
+              <div class={style.infoContent}>
+                <div class={style.infoTextWrapper}>
+                  <h2 class={style.infoTitle}>Secure</h2>
+                  <p class={style.infoCaption}>
+                    Worried about privacy? Images never leave your device since
+                    Squoosh does all the work locally.
+                  </p>
+                </div>
+                <div class={style.infoImgWrapper}>
+                  <img
+                    class={style.infoImg}
+                    src={secureSectionAsset}
+                    alt="silhouette of a cloud with a 'no' symbol on top"
+                    width="498"
+                    height="333"
+                  />
+                </div>
+              </div>
+            </SlideOnScroll>
+          </div>
+        </section>
+
+        <footer class={style.footer}>
+          <div class={style.footerContainer}>
+            <svg viewBox="0 0 1920 79" class={style.topWave}>
+              <path
+                d="M0 59l64-11c64-11 192-34 320-43s256-5 384 4 256 23 384 34 256 21 384 14 256-30 320-41l64-11v94H0z"
+                class={style.footerWave}
+              />
+            </svg>
+            <div class={style.footerPadding}>
+              <footer class={style.footerItems}>
+                <a
+                  class={style.footerLink}
+                  href="https://github.com/GoogleChromeLabs/squoosh/blob/dev/README.md#privacy"
+                >
+                  Privacy
+                </a>
+                <a
+                  class={style.footerLink}
+                  href="https://github.com/GoogleChromeLabs/squoosh/tree/dev/cli"
+                >
+                  Squoosh CLI
+                </a>
+                <a
+                  class={style.footerLinkWithLogo}
+                  href="https://github.com/GoogleChromeLabs/squoosh"
+                >
+                  <img src={githubLogo} alt="" width="10" height="10" />
+                  Source on Github
+                </a>
+              </footer>
+            </div>
+          </div>
+        </footer>
         {beforeInstallEvent && (
           <button class={style.installBtn} onClick={this.onInstallClick}>
             Install

src/shared/prerendered-app/Intro/missing-types.d.ts

@@ -30,11 +30,6 @@ interface WindowEventMap {
   beforeinstallprompt: BeforeInstallPromptEvent;
 }
 
-interface ClipboardItem {
-  types: string[];
-  getType(type: string): Promise<Blob>;
-}
-
 interface Clipboard {
   read(): Promise<ClipboardItem[]>;
 }

src/shared/prerendered-app/Intro/style.css

@@ -118,7 +118,114 @@
   fill: var(--light-blue);
 }
 
+.bottom-wave {
+  position: relative;
+}
+
+.info {
+  background: var(--white);
+  position: relative;
+  padding: 5em 2em;
+
+  @media (min-width: 1200px) {
+    padding: 5em 0;
+  }
+}
+
+.info-container {
+  max-width: 1000px;
+  margin: 0 auto;
+}
+
+.info-content {
+  display: grid;
+  align-items: center;
+  grid-template-columns: 1fr;
+  gap: 1em;
+
+  grid-template-areas:
+    'text'
+    'img';
+
+  @media (min-width: 712px) {
+    grid-template-columns: 1fr 1fr;
+    grid-template-areas: 'text img';
+
+    .info:nth-child(even) & {
+      grid-template-areas: 'img text';
+    }
+  }
+}
+
+.info-title {
+  color: var(--pink);
+  font-size: 3em;
+  margin: 0;
+}
+
+.info-caption {
+  font-size: 1.5em;
+  line-height: 1.75;
+  margin: 1em 0 0.5em 0;
+}
+
+.info-link {
+  font-size: 1.25em;
+  text-underline-offset: 0.25em;
+  color: var(--off-black);
+  transition: color 400ms ease-in-out;
+  margin-top: 1em;
+  &:hover {
+    color: var(--dim-blue);
+  }
+}
+
+.info-text-wrapper {
+  display: flex;
+  flex-flow: column wrap;
+  max-width: 27em;
+  justify-self: center;
+  grid-area: text;
+
+  @media (min-width: 712px) {
+    justify-self: start;
+    .info:nth-child(even) & {
+      text-align: right;
+      justify-self: end;
+    }
+  }
+}
+
+.info-img-wrapper {
+  grid-area: img;
+}
+
+.info-img {
+  display: block;
+  width: 100%;
+  height: auto;
+  max-width: 400px;
+  margin: 0 auto;
+
+  @media (min-width: 768px) {
+    margin: 0 0 0 auto;
+
+    .info:nth-child(even) & {
+      margin: 0;
+    }
+  }
+}
+
+.info-wave {
+  fill: var(--white);
+}
+
 .footer {
+  background: var(--white);
+  padding-top: 5em;
+}
+
+.footer-container {
   position: relative;
   background: var(--light-gray);
 }
@@ -128,7 +235,11 @@
 }
 
 .content-padding {
-  padding: 2rem;
+  padding: 2em 0;
+}
+
+.footer-padding {
+  padding: 2em;
 }
 
 .footer-items {

src/static-build/index.tsx

@@ -25,18 +25,6 @@ import { lookup as lookupMime } from 'mime-types';
 const manifestSize = ({ width, height }: { width: number; height: number }) =>
   `${width}x${height}`;
 
-// Set by Netlify
-const branch = process.env.BRANCH;
-
-const branchOriginTrialIds = new Map([
-  [
-    'live',
-    'Aj5GY7W9AHM8di+yvMCajIhLRHoYN7slruwOYXE/Iub5hgmW/r2RQt07vrUuT4eUTkWxcyNCAVkiI+5ugdVW3gAAAABUeyJvcmlnaW4iOiJodHRwczovL3NxdW9vc2guYXBwOjQ0MyIsImZlYXR1cmUiOiJXZWJBc3NlbWJseVNpbWQiLCJleHBpcnkiOjE2MjM4MDE1OTl9',
-  ],
-]);
-
-const originTrialId = branchOriginTrialIds.get(branch || '');
-
 interface Output {
   [outputPath: string]: string;
 }
@@ -110,15 +98,6 @@ const toOutput: Output = {
     /*
       Cross-Origin-Embedder-Policy: require-corp
       Cross-Origin-Opener-Policy: same-origin
-
-    # Origin trial for WebAssembly SIMD.
-    ${
-      originTrialId
-        ? `  Origin-Trial: ${originTrialId}`
-        : `# Cannot find origin trial ID. process.env.BRANCH is: ${JSON.stringify(
-            branch,
-          )}`
-    }
   `,
 };
 

src/static-build/pages/index/index.tsx

@@ -16,7 +16,8 @@ import baseCss from 'css:./base.css';
 import initialCss from 'initial-css:';
 import { allSrc } from 'client-bundle:client/initial-app';
 import favicon from 'url:static-build/assets/favicon.ico';
-import { escapeStyleScriptContent } from 'static-build/utils';
+import ogImage from 'url:static-build/assets/icon-large-maskable.png';
+import { escapeStyleScriptContent, siteOrigin } from 'static-build/utils';
 import Intro from 'shared/prerendered-app/Intro';
 
 interface Props {}
@@ -27,7 +28,27 @@ const Index: FunctionalComponent<Props> = () => (
       <title>Squoosh</title>
       <meta
         name="description"
-        content="Compress and compare images with different codecs, right in your browser"
+        content="Squoosh is the ultimate image optimizer that allows you to compress and compare images with different codecs in your browser."
+      />
+      <meta name="twitter:card" content="summary" />
+      <meta name="twitter:site" content="@SquooshApp" />
+      <meta property="og:title" content="Squoosh" />
+      <meta property="og:type" content="website" />
+      <meta property="og:image" content={`${siteOrigin}${ogImage}`} />
+      <meta
+        property="og:image:secure_url"
+        content={`${siteOrigin}${ogImage}`}
+      />
+      <meta property="og:image:type" content="image/png" />
+      <meta property="og:image:width" content="500" />
+      <meta property="og:image:height" content="500" />
+      <meta
+        property="og:image:alt"
+        content="A cartoon of a hand squeezing an image file on a dark background."
+      />
+      <meta
+        name="og:description"
+        content="Squoosh is the ultimate image optimizer that allows you to compress and compare images with different codecs in your browser."
       />
       <meta
         name="viewport"
@@ -36,8 +57,10 @@ const Index: FunctionalComponent<Props> = () => (
       <meta name="mobile-web-app-capable" content="yes" />
       <meta name="apple-mobile-web-app-capable" content="yes" />
       <link rel="shortcut icon" href={favicon} />
+      <link rel="apple-touch-icon" href={ogImage} />
       <meta name="theme-color" content="#ff3385" />
       <link rel="manifest" href="/manifest.json" />
+      <link rel="canonical" href={siteOrigin} />
       <style
         dangerouslySetInnerHTML={{ __html: escapeStyleScriptContent(baseCss) }}
       />

src/static-build/utils.tsx

@@ -16,8 +16,35 @@ import { join as joinPath } from 'path';
 import render from 'preact-render-to-string';
 import { VNode } from 'preact';
 
+import { StrictCsp } from 'strict-csp';
+
 export function renderPage(vnode: VNode) {
-  return '<!DOCTYPE html>' + render(vnode);
+  const htmlString = '<!DOCTYPE html>' + render(vnode);
+  const htmlStringWithCsp = addCspAsMetaTag(htmlString);
+  return htmlStringWithCsp;
+}
+
+/**
+ * Add to the html string a strict Content-Security-Policy (CSP), as a meta tag.
+ * Details at https://web.dev/strict-csp/
+ */
+function addCspAsMetaTag(htmlString: string) {
+  const s = new StrictCsp(htmlString);
+  // Refactor sourced scripts so that we can set a strict CSP
+  s.refactorSourcedScriptsForHashBasedCsp();
+  // Hash inline scripts from this html file, if there are any
+  const scriptHashes = s.hashAllInlineScripts();
+  // Generate a strict CSP as a string
+  // enableUnsafeEval is set to true, to accomodate for uses of eval by emscripten. This makes the CSP a bit less secure
+  const strictCsp = StrictCsp.getStrictCsp(scriptHashes, {
+    enableBrowserFallbacks: true,
+    enableTrustedTypes: false,
+    enableUnsafeEval: true,
+  });
+  // Set this CSP via a meta tag
+  s.addMetaTag(strictCsp);
+  const htmlStringWithCsp = s.serializeDom();
+  return htmlStringWithCsp;
 }
 
 interface OutputMap {
@@ -56,3 +83,17 @@ export function escapeStyleScriptContent(str: string): string {
     .replace(/<style/g, '<\\style')
     .replace(/<\/style/g, '<\\/style');
 }
+
+/**
+ * Origin of the site, depending on the environment.
+ */
+export const siteOrigin = (() => {
+  if (process.env.DEV_PORT) return `http://localhost:${process.env.DEV_PORT}`;
+  // https://docs.netlify.com/configure-builds/environment-variables/#build-metadata
+  if (process.env.CONTEXT === 'production') return 'https://squoosh.app';
+  if (process.env.DEPLOY_PRIME_URL) return process.env.DEPLOY_PRIME_URL;
+  console.warn(
+    'Unable to determine site origin, defaulting to https://squoosh.app',
+  );
+  return 'https://squoosh.app';
+})();

src/sw/to-cache.ts

@@ -82,24 +82,20 @@ initialJs = subtractSets(
 export const initial = ['/', ...initialJs];
 
 export const theRest = (async () => {
-  const [
-    supportsThreads,
-    supportsSimd,
-    supportsWebP,
-    supportsAvif,
-  ] = await Promise.all([
-    threads(),
-    simd(),
-    ...[webpDataUrl, avifDataUrl].map(async (dataUrl) => {
-      if (!self.createImageBitmap) return false;
-      const response = await fetch(dataUrl);
-      const blob = await response.blob();
-      return createImageBitmap(blob).then(
-        () => true,
-        () => false,
-      );
-    }),
-  ]);
+  const [supportsThreads, supportsSimd, supportsWebP, supportsAvif] =
+    await Promise.all([
+      threads(),
+      simd(),
+      ...[webpDataUrl, avifDataUrl].map(async (dataUrl) => {
+        if (!self.createImageBitmap) return false;
+        const response = await fetch(dataUrl);
+        const blob = await response.blob();
+        return createImageBitmap(blob).then(
+          () => true,
+          () => false,
+        );
+      }),
+    ]);
 
   const items: string[] = [];
 

static-build-tsconfig.json

@@ -1,7 +1,7 @@
 {
   "extends": "./generic-tsconfig.json",
   "compilerOptions": {
-    "lib": ["esnext", "dom"],
+    "lib": ["esnext", "dom", "dom.iterable"],
     "types": ["node"]
   },
   "include": ["src/shared/**/*", "src/static-build/**/*"]