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/* eslint-disable no-new-func */
const ResizeWorker = (): void => {
self.onmessage = (event: MessageEvent): void => {
// Hack for Safari. Workers can become unpredictable.
// Sometimes 'self.postMessage' doesn't emit 'onmessage' event.
setTimeout((): void => {
const {
file,
options = {},
getResizedImageSizeSource,
createImagePreviewCanvasSource,
sharpenSource,
shouldSharpenSource,
/* type, */
} = event.data.message;
createImageBitmap(file)
.then((bitmap: ImageBitmap) => {
const getResizedImageSize = new Function(`return ${getResizedImageSizeSource}`)();
const { targetWidth, targetHeight, useOriginalSize } = getResizedImageSize(bitmap, options);
if (useOriginalSize)
{
bitmap.close();
self.postMessage({
id: event?.data?.id,
message: {
useOriginalSize,
targetWidth,
targetHeight,
},
}, []);
}
else
{
const createImagePreviewCanvas = new Function(`return ${createImagePreviewCanvasSource}`)();
let offscreenCanvas: OffscreenCanvas = createImagePreviewCanvas(bitmap, targetWidth, targetHeight);
const sharpen = new Function(`return ${sharpenSource}`)();
const shouldSharpen = new Function(`return ${shouldSharpenSource}`)();
if (shouldSharpen(bitmap, targetWidth, targetHeight))
{
sharpen(offscreenCanvas, targetWidth, targetHeight, 0.2);
}
bitmap.close();
const previewBitmap = offscreenCanvas.transferToImageBitmap();
offscreenCanvas.width = 0;
offscreenCanvas.height = 0;
offscreenCanvas = null;
self.postMessage({
id: event?.data?.id,
message: {
bitmap: previewBitmap,
useOriginalSize,
targetWidth,
targetHeight,
},
}, [previewBitmap]);
// const { quality = 0.92 } = options;
// offscreenCanvas.convertToBlob({ quality, type })
// .then((blob: Blob): void => {
// self.postMessage({
// id: event?.data?.id,
// message: {
// blob,
// useOriginalSize,
// targetWidth,
// targetHeight,
// },
// }, []);
// })
// .catch((error): void => {
// console.log('Resize Worker Error (convertToBlob)', error);
// self.postMessage({
// id: event.data.id,
// message: null,
// }, []);
// })
// ;
}
})
.catch((error): void => {
// eslint-disable-next-line no-console
console.log('Uploader: Resize Worker Error (createImageBitmap)', error);
self.postMessage({
id: event.data.id,
message: null,
}, []);
})
;
}, 0);
};
};
export default ResizeWorker;