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import * as jpeg from '@jsquash/jpeg'; |
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import * as png from '@jsquash/png'; |
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import optimise from '@jsquash/oxipng/optimise'; |
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|
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async function decode(sourceType, fileBuffer) { |
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switch (sourceType) { |
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//case 'avif': |
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// return await avif.decode(fileBuffer); |
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case 'jpeg': |
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return await jpeg.decode(fileBuffer); |
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case 'png': |
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return await png.decode(fileBuffer); |
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//case 'webp': |
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// return await webp.decode(fileBuffer); |
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default: |
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throw new Error(`Unknown source type: ${sourceType}`); |
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} |
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} |
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|
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async function encode(outputType, imageData) { |
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const options = { |
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"jpeg_quality": 75, |
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"jpeg_baseline": false, |
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"jpeg_arithmetic": false, |
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"jpeg_progressive": true, |
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"jpeg_optimize_coding": true, |
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"jpeg_smoothing": 0, |
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"jpeg_color_space": 3, |
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"jpeg_quant_table": 3, |
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"jpeg_trellis_multipass": false, |
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"jpeg_trellis_opt_zero": false, |
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"jpeg_trellis_opt_table": false, |
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"jpeg_trellis_loops": 1, |
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"jpeg_auto_subsample": true, |
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"jpeg_chroma_subsample": 2, |
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"jpeg_separate_chroma_quality": false, |
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"jpeg_chroma_quality": 75, |
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"png_level": 2, |
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"png_interlace": false, |
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"auto_compress": true, |
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"backup_original": true |
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}; |
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|
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switch (outputType) { |
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//case 'avif': |
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// return await avif.encode(imageData); |
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case 'jpeg': |
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const jpegOptions = {} |
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for (const [key, value] of Object.entries(options)) { |
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if (key.includes('jpeg')) { |
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const keyName = key.replace('jpeg_', '') |
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jpegOptions[keyName] = value |
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} |
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} |
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return await jpeg.encode(imageData, jpegOptions); |
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case 'png': |
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const pngOptions = {} |
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for (const [key, value] of Object.entries(options)) { |
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if (key.includes('png')) { |
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const keyName = key.replace('png_', '') |
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pngOptions[keyName] = value |
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} |
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} |
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return await png.encode(imageData, pngOptions); |
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//case 'webp': |
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// return await webp.encode(imageData); |
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default: |
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throw new Error(`Unknown output type: ${outputType}`); |
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} |
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} |
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|
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async function convert(sourceType, outputType, fileBuffer) { |
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const imageData = await decode(sourceType, fileBuffer); |
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return encode(outputType, imageData); |
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} |
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|
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function blobToBase64(blob) { |
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return new Promise((resolve, _) => { |
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const reader = new FileReader(); |
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reader.onloadend = () => resolve(reader.result); |
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reader.readAsDataURL(blob); |
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}); |
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} |
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|
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async function showOutput(imageBuffer, outputType) { |
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const imageBlob = new Blob([imageBuffer], { type: `image/${outputType}` }); |
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const base64String = await blobToBase64(imageBlob); |
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|
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return base64String; |
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} |
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|
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self.onmessage = async function(e) { |
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console.log('Worker: Message received from main script'); |
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|
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const {fileBuffer, sourceType, outputType} = e.data; |
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|
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let imageBuffer = await convert(sourceType, outputType, fileBuffer); |
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let base64 = await showOutput(imageBuffer, outputType); |
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|
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console.log(e) |
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|
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postMessage(base64) |
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|
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} |
