Make emscripten with threads compile

codecs/webp_enc/build.sh

@@ -14,14 +14,12 @@ echo "============================================="
   emcc \
     ${OPTIMIZE} \
     --bind \
-    -D WEBP_USE_THREAD \
-    -s ALLOW_MEMORY_GROWTH=1 \
+    -D WEBP_USE_THREAD=1 \
     -s USE_PTHREADS=1 \
     -s ASSERTIONS=1 \
-    -s PTHREAD_POOL_SIZE=2 \
+    -s PTHREAD_POOL_SIZE=4 \
     -s TOTAL_MEMORY=268435456 \
     -s WASM_MEM_MAX=268435456 \
-    -s 'EXPORT_NAME="webp_enc"' \
     --std=c++11 \
     -I node_modules/libwebp \
     -o ./webp_enc.js \

codecs/webp_enc/example.html

@@ -19,7 +19,7 @@
 
   Module.onRuntimeInitialized = async _ => {
     console.log('Version:', Module.version().toString(16));
-    const image = await loadImage('../example.png');
+    const image = await loadImage('../really_big.jpg');
     let start = performance.now();
     const result = Module.encode(image.data, image.width, image.height, {
       quality: 75,