49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
const PDFJS = require('pdfjs-dist')
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PDFJS.GlobalWorkerOptions.workerSrc = `https://cdnjs.cloudflare.com/ajax/libs/pdf.js/${PDFJS.version}/pdf.worker.js`
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import jpeg from 'jpeg-js'
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import { PNG } from 'pngjs'
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export async function processPdf(file) {
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var typedarray = new Uint8Array(file)
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const canvas = document.getElementById('canvas')
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const ctx = canvas.getContext('2d')
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var loadingTask = PDFJS.getDocument(typedarray)
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await loadingTask.promise.then(async function (pdfDocument) {
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const pdfPage = await pdfDocument.getPage(1)
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const viewport = pdfPage.getViewport({ scale: 1 })
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canvas.width = viewport.width
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canvas.height = viewport.height
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const renderTask = pdfPage.render({
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canvasContext: ctx,
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viewport,
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})
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return await renderTask.promise
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})
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var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height)
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return imageData
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}
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export async function processJpeg(file) {
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return jpeg.decode(file)
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}
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export async function processPng(file) {
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return new Promise(async (resolve, reject) => {
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let png = new PNG({ filterType: 4 })
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png.parse(file, (error, data) => {
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if(error) {
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reject()
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}
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resolve(data)
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})
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})
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} |