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galene/static/background-blur-worker.js

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'use strict';
let imageSegmenter;
async function loadImageSegmenter(model) {
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let module = await import('/third-party/tasks-vision/vision_bundle.mjs');
let vision = await module.FilesetResolver.forVisionTasks(
"/third-party/tasks-vision/wasm"
);
return await module.ImageSegmenter.createFromOptions(vision, {
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baseOptions: {
modelAssetPath: model,
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},
outputCategoryMask: true,
outputConfidenceMasks: false,
runningMode: 'VIDEO',
});
}
onmessage = async e => {
let data = e.data;
if(imageSegmenter == null) {
try {
imageSegmenter = await loadImageSegmenter(data.model);
if(imageSegmenter == null)
throw new Error("loadImageSegmenter returned null");
} catch(e) {
postMessage(e);
return;
}
postMessage(null);
return;
}
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let bitmap = e.data.bitmap;
if(!(bitmap instanceof ImageBitmap)) {
postMessage(new Error('Bad type for worker data'));
return;
}
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try {
let width = bitmap.width;
let height = bitmap.height;
imageSegmenter.segmentForVideo(
bitmap, e.data.timestamp,
result => {
/** @type{Uint8Array} */
let mask = result.categoryMask.getAsUint8Array();
let id = new ImageData(width, height);
for(let i = 0; i < mask.length; i++)
id.data[4 * i + 3] = mask[i];
result.close();
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createImageBitmap(id).then(ib => {
postMessage({
bitmap: bitmap,
mask: ib,
}, [bitmap, ib]);
});
},
);
} catch(e) {
bitmap.close();
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postMessage(e);
}
};