Hqx fix (#629)

* Optimising wasm so it doesn't break Chrome

* Simpler dockerfile (thanks surma!)

codecs/hqx/Dockerfile

@@ -1,7 +1,8 @@
 FROM ubuntu
 RUN apt-get update && \
   apt-get install -qqy git build-essential cmake python2.7
-RUN git clone --recursive https://github.com/WebAssembly/wabt /usr/src/wabt
+
+RUN git clone --depth 1 --recursive https://github.com/WebAssembly/wabt /usr/src/wabt
 RUN mkdir -p /usr/src/wabt/build
 WORKDIR /usr/src/wabt/build
 RUN cmake .. -DCMAKE_INSTALL_PREFIX=/opt/wabt && \
@@ -14,5 +15,7 @@ RUN rustup install nightly && \
   cargo install wasm-pack
 
 COPY --from=0 /opt/wabt /opt/wabt
-ENV PATH="/opt/wabt/bin:${PATH}"
+RUN mkdir /opt/binaryen && \
+ curl -L https://github.com/WebAssembly/binaryen/releases/download/1.38.32/binaryen-1.38.32-x86-linux.tar.gz  | tar -xzf - -C /opt/binaryen --strip 1
+ENV PATH="/opt/binaryen:/opt/wabt/bin:${PATH}"
 WORKDIR /src

codecs/hqx/build.sh

@@ -9,6 +9,9 @@ echo "============================================="
   rustup run nightly \
     wasm-pack build --target no-modules
   wasm-strip pkg/squooshhqx_bg.wasm
+  echo "Optimising WASM so it doesn't break Chrome (this takes like 10-15mins. get a cup of tea)"
+  echo "Once https://bugs.chromium.org/p/chromium/issues/detail?id=97480 is fixed, we can remove this step"
+  wasm-opt -Os --no-validation -o pkg/squooshhqx_bg.wasm pkg/squooshhqx_bg.wasm
   rm pkg/.gitignore
 )
 echo "============================================="