Compile JXL encoder

codecs/jxl_enc/README.md

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+# JPEG XL decoder
+
+- Source: <https://gitlab.com/wg1/jpeg-xl>
+- Version: ???
+
+## Example
+
+See `example.html`
+
+## API
+
+### `RawImage decode(std::string buffer)`
+
+Decodes the given avif buffer into raw RGBA. `RawImage` is a class with 3 fields: `buffer`, `width`, and `height`.
+
+### `void free_result()`
+
+Frees the result created by `decode()`.

codecs/jxl_enc/build.sh

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+#!/bin/bash
+
+set -e
+
+export OPTIMIZE="-Os"
+export LDFLAGS="${OPTIMIZE}"
+export CFLAGS="${OPTIMIZE}"
+export CPPFLAGS="${OPTIMIZE}"
+
+echo "============================================="
+echo "Downloading libjxl"
+echo "============================================="
+test -d node_modules/jxl || (
+  cd node_modules
+  git clone --recursive https://gitlab.com/wg1/jpeg-xl.git jxl
+)
+echo "============================================="
+echo "Downloading libjxl done"
+echo "============================================="
+
+echo "============================================="
+echo "Compiling libjxl"
+echo "============================================="
+
+test -n "$SKIP_LIBJXL" || (
+  cd node_modules/jxl
+  git submodule update --init --recursive
+  mkdir -p build
+  cd build
+  emcmake cmake ../
+  emmake make jpegxl-static 
+)
+
+echo "============================================="
+echo "Compiling libjxl done"
+echo "============================================="
+
+echo "============================================="
+echo "Compiling wasm bindings"
+echo "============================================="
+
+emcc \
+    ${OPTIMIZE} \
+    --bind \
+    -s ALLOW_MEMORY_GROWTH=1 \
+    -s MODULARIZE=1 \
+    -s 'EXPORT_NAME="jxl_enc"' \
+    -I ./node_modules/jxl \
+    -I ./node_modules/jxl/include \
+    -I ./node_modules/jxl/third_party/brunsli \
+    -I ./node_modules/jxl/third_party/brunsli/c/include \
+    -I ./node_modules/jxl/third_party/highway \
+    -o ./jxl_enc.js \
+    -x c++ \
+    --std=c++11 \
+    jxl_enc.cpp \
+    ./node_modules/jxl/build/libjpegxl-static.bc \
+    ./node_modules/jxl/build/third_party/brunsli/libbrunslienc-static.bc \
+    ./node_modules/jxl/build/third_party/brunsli/libbrunslidec-static.bc \
+    ./node_modules/jxl/build/third_party/brunsli/libbrunslicommon-static.bc \
+    ./node_modules/jxl/build/third_party/brotli/libbrotlienc-static.bc \
+    ./node_modules/jxl/build/third_party/brotli/libbrotlidec-static.bc \
+    ./node_modules/jxl/build/third_party/brotli/libbrotlicommon-static.bc \
+    ./node_modules/jxl/build/third_party/liblcms2.bc \
+    ./node_modules/jxl/build/third_party/highway/libhwy.bc
+
+echo "============================================="
+echo "Compiling wasm bindings done"
+echo "============================================="
+
+echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+echo "Did you update your docker image?"
+echo "Run \`docker pull trzeci/emscripten\`"
+echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"

codecs/jxl_enc/example.js

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+const fs = require("fs");
+const avifEnc = require("./jxl_enc.js")(fs.readFileSync("./jxl_enc.wasm"));
+
+avifEnc.onRuntimeInitialized = () => {
+  const jxl = avifEnc.encode(
+    new Uint8Array([255, 0, 0, 255, 0, 255, 0, 255, 0, 0, 255, 255]),
+    3,
+    1
+  );
+  console.log(jxl)
+  fs.writeFileSync("lol.jxl", jxl);
+};

codecs/jxl_enc/jxl_enc.cpp

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+#include <emscripten/bind.h>
+#include <emscripten/val.h>
+
+#include "jxl/enc_file.h"
+
+using namespace emscripten;
+
+uint8_t *result;
+val encode(std::string image, int width, int height) {
+  jxl::CompressParams cparams;
+  jxl::PassesEncoderState passes_enc_state;
+  // jxl::ThreadPool pool;
+  jxl::CodecInOut io;
+  jxl::PaddedBytes bytes;
+
+  cparams.speed_tier = jxl::SpeedTier::kFalcon;
+
+  jxl::ImageBundle *main = &io.Main();
+
+  auto result = main->SetFromSRGB(
+      width, height, false, true, true, (uint8_t *)image.c_str(),
+      (uint8_t *)image.c_str() + width * height * 4);
+
+  if (!result) {
+    return val::null();
+  }
+
+  if (!EncodeFile(cparams, &io, &passes_enc_state, &bytes)) {
+    return val::null();
+  }
+
+  return val(typed_memory_view(bytes.size(), bytes.data()));
+}
+
+void free_result() { delete result; }
+
+EMSCRIPTEN_BINDINGS(my_module) {
+  function("encode", &encode);
+  function("free_result", &free_result);
+}

codecs/jxl_enc/jxl_enc.d.ts

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+// import { EncodeOptions } from '../../src/codecs/avif/encoder-meta';
+
+interface JXLModule extends EmscriptenWasm.Module {
+  encode(data: BufferSource, width: number, height: number): Uint8Array;
+  free_result(): void;
+}
+
+
+export default function(opts: EmscriptenWasm.ModuleOpts): JXLModule;

codecs/jxl_enc/package.json

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+{
+  "name": "jxl_enc",
+  "scripts": {
+    "install": "napa",
+    "build": "docker run --rm -v $(pwd):/src trzeci/emscripten ./build.sh"
+  },
+  "napa": {
+  },
+  "devDependencies": {
+    "napa": "3.0.0"
+  }
+}