Rollup build

src/features/processors/quantize/worker/quantize.ts

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+/**
+ * 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 imagequant, { QuantizerModule } from 'codecs/imagequant/imagequant';
+import wasmUrl from 'url:codecs/imagequant/imagequant.wasm';
+import { initEmscriptenModule } from 'features/worker-utils';
+import { Options } from '../shared/meta';
+
+let emscriptenModule: Promise<QuantizerModule>;
+
+export default async function process(
+  data: ImageData,
+  opts: Options,
+): Promise<ImageData> {
+  if (!emscriptenModule) {
+    emscriptenModule = initEmscriptenModule(imagequant, wasmUrl);
+  }
+
+  const module = await emscriptenModule;
+
+  const result = opts.zx
+    ? module.zx_quantize(data.data, data.width, data.height, opts.dither)
+    : module.quantize(
+        data.data,
+        data.width,
+        data.height,
+        opts.maxNumColors,
+        opts.dither,
+      );
+
+  return new ImageData(result, data.width, data.height);
+}