ergosteur
8ec2c07b3f
Key changes: - Added Web Worker for background image thumbnailing with a 1MiB threshold to optimize CPU/memory usage. - Implemented a serial task queue for memory-safe high-res image processing, preventing OOM crashes. - Added inter-post preloading in the modal for seamless 'Previous/Next' navigation. - Refined scanning UI with double-buffering and a dark background to completely eliminate white flashes. - Renamed project to 'instaarchive-viewer' in package.json. - Fixed 'Open image in new tab' by denylisting /archives and /api in PWA config.
43 lines
1.1 KiB
TypeScript
43 lines
1.1 KiB
TypeScript
/**
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* Thumbnail Generation Worker
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* Uses OffscreenCanvas and createImageBitmap for high-performance,
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* background-thread image resizing.
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*/
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self.onmessage = async (e: MessageEvent) => {
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const { id, blob, width } = e.data;
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try {
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// 1. Create a bitmap from the blob (native browser decoding)
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// We resize it DURING the decode step for maximum efficiency
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const bitmap = await createImageBitmap(blob, {
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resizeWidth: width,
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resizeQuality: 'medium'
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});
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// 2. Use OffscreenCanvas to draw the resized bitmap
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const canvas = new OffscreenCanvas(bitmap.width, bitmap.height);
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const ctx = canvas.getContext('2d');
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if (!ctx) {
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throw new Error('Could not get OffscreenCanvas context');
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}
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ctx.drawImage(bitmap, 0, 0);
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// 3. Convert to a small JPEG blob
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const thumbnailBlob = await canvas.convertToBlob({
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type: 'image/jpeg',
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quality: 0.7
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});
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// 4. Release bitmap memory
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bitmap.close();
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// 5. Send result back
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self.postMessage({ id, blob: thumbnailBlob });
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} catch (err: any) {
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self.postMessage({ id, error: err.message });
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}
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};
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