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// We can't use createImageBitmap due to the bug in Chrome (https://bugs.chromium.org/p/chromium/issues/detail?id=1220671).
// Chrome doesn't respect JPEG Orientation.
// Use 'bitmaprenderer' and transferFromImageBitmap to make a blob from the ImageBitmap;
/*
const canvas = document.createElement('canvas');
canvas.width = bitmap.width;
canvas.height = bitmap.height;
const ctx = canvas.getContext('bitmaprenderer');
if (ctx)
{
ctx.transferFromImageBitmap(bitmap);
}
else
{
// twice in memory...
canvas.getContext('2d').drawImage(bitmap, 0, 0);
}
*/
export const ResizeWorker = function() {
self.onmessage = event => {
const { file, options = {}, calcTargetSizeFn } = event.data.message;
self.createImageBitmap(file)
.then(bitmap => {
const calcTargetSize = new Function('return ' + calcTargetSizeFn.toString())();
const { targetWidth, targetHeight } = calcTargetSize(bitmap, options);
const resizeOptions = { resizeWidth: targetWidth, resizeHeight: targetHeight };
self.createImageBitmap(bitmap, resizeOptions).then(previewBitmap => {
bitmap.close();
self.postMessage({
id: event.data.id,
message: {
bitmap: previewBitmap,
targetWidth,
targetHeight,
},
}, [previewBitmap]);
});
/*const canvas = new OffscreenCanvas(targetWidth, targetHeight);
const context = canvas.getContext('2d');
context.imageSmoothingQuality = 'high';
context.drawImage(bitmap, 0, 0, targetWidth, targetHeight);
const previewBitmap = canvas.transferToImageBitmap();*/
})
.catch((error) => {
console.warn('worker error', error);
self.postMessage({ id: event.data.id, message: null });
})
;
};
};