77bb784efd
* chore(npm): Install blurhash * feat(media): Show blurhash * fix(media/blurhash): Better sensitive video handling * feat(media): Preference for using blurhash * chore(utils/blurhash): Add performance marks * fix(utils/blurhash): Performance marks * fix(utils/blurhash): Use correct dimension * refactor(utils/blurhash): Use constant for number of pixels * refactor(media): Simplify logic for displaying blurhash * chore(tests/spec): Attempt to adjust sensitivity tests for blurhash * chore(tests/spec): Update sensitivity tests for blurhash * chore(tests/spec): Check for sensitive * fix(media/blurhash): Handle videos * fix: Video handling * fix: Videos * minor refactoring, fix Svelte warning * fix: Large inline images and videos * feat(settings): Rename blurhash setting * refactor: Use toBlob, block media rendering until blurhash ready * refactor: Move computations to Web Worker * fix(workers/blurhash): More error handling * feat(workers/blurhash): Use quick-lru for caching * fix: Don't create Context2D needlessly * fix(workers/blurhash): Increase cache size to 100 * fix(workers/blurhash): Don't resolve promise twice * fix(utils/decode-image): Ignore data URLs Throws exception which prevents the image from loading.
46 lines
1.7 KiB
JavaScript
46 lines
1.7 KiB
JavaScript
import { decode as decodeBlurHash } from 'blurhash'
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import QuickLRU from 'quick-lru'
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const RESOLUTION = 32
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const OFFSCREEN_CANVAS = typeof OffscreenCanvas === 'function'
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? new OffscreenCanvas(RESOLUTION, RESOLUTION) : null
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const OFFSCREEN_CANVAS_CONTEXT_2D = OFFSCREEN_CANVAS
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? OFFSCREEN_CANVAS.getContext('2d') : null
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const CACHE = new QuickLRU({ maxSize: 100 })
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self.addEventListener('message', ({ data: { encoded } }) => {
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try {
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if (CACHE.has(encoded)) {
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if (OFFSCREEN_CANVAS) {
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postMessage({ encoded, decoded: CACHE.get(encoded), imageData: null, error: null })
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} else {
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postMessage({ encoded, imageData: CACHE.get(encoded), decoded: null, error: null })
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}
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} else {
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const pixels = decodeBlurHash(encoded, RESOLUTION, RESOLUTION)
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if (pixels) {
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const imageData = new ImageData(pixels, RESOLUTION, RESOLUTION)
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if (OFFSCREEN_CANVAS) {
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OFFSCREEN_CANVAS_CONTEXT_2D.putImageData(imageData, 0, 0)
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OFFSCREEN_CANVAS.convertToBlob().then(blob => {
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const decoded = URL.createObjectURL(blob)
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CACHE.set(encoded, decoded)
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postMessage({ encoded, decoded, imageData: null, error: null })
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}).catch(error => {
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postMessage({ encoded, decoded: null, imageData: null, error })
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})
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} else {
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CACHE.set(encoded, imageData)
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postMessage({ encoded, imageData, decoded: null, error: null })
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}
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} else {
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postMessage({ encoded, decoded: null, imageData: null, error: new Error('decode did not return any pixels') })
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}
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}
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} catch (error) {
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postMessage({ encoded, decoded: null, imageData: null, error })
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}
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})
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