84 lines
2.5 KiB
TypeScript
84 lines
2.5 KiB
TypeScript
import { showLoader, hideLoader, showAlert } from '../ui.js';
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import { downloadFile, readFileAsArrayBuffer, getPDFDocument } from '../utils/helpers.js';
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import { state } from '../state.js';
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import JSZip from 'jszip';
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import UTIF from 'utif';
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import * as pdfjsLib from 'pdfjs-dist';
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import { PDFPageProxy } from 'pdfjs-dist';
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pdfjsLib.GlobalWorkerOptions.workerSrc = new URL('pdfjs-dist/build/pdf.worker.min.mjs', import.meta.url).toString();
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const yieldToUI = () => new Promise((r) => setTimeout(r, 0));
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export async function pdfToTiff() {
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showLoader('Converting PDF to TIFF...');
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await yieldToUI();
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try {
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const pdf = await getPDFDocument(
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await readFileAsArrayBuffer(state.files[0])
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).promise;
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if(pdf.numPages === 1) {
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showLoader(`Processing the single page...`);
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await yieldToUI();
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const page = await pdf.getPage(1);
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const tiffBuffer = await pageToBlob(page);
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downloadFile(tiffBuffer, getCleanFilename() + '.tiff');
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} else {
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const zip = new JSZip();
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for (let i = 1; i <= pdf.numPages; i++) {
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showLoader(`Processing page ${i} of ${pdf.numPages}...`);
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await yieldToUI();
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const page = await pdf.getPage(i);
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const tiffBuffer = await pageToBlob(page);
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zip.file(`page_${i}.tiff`, tiffBuffer);
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}
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showLoader('Compressing files into a ZIP...');
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await yieldToUI();
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const zipBlob = await zip.generateAsync({ type: 'blob' });
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downloadFile(zipBlob, getCleanFilename() + '_tiffs.zip');
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}
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} catch (e) {
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console.error(e);
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showAlert(
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'Error',
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'Failed to convert PDF to TIFF. The file might be corrupted.'
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);
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} finally {
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hideLoader();
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}
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}
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async function pageToBlob(page: PDFPageProxy): Promise<Blob> {
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const viewport = page.getViewport({ scale: 2.0 }); // Use 2x scale for high quality
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d');
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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await page.render({
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canvasContext: context,
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viewport: viewport,
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canvas: canvas,
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}).promise;
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const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
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const rgba = imageData.data;
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const tiffBuffer = UTIF.encodeImage(
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new Uint8Array(rgba),
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canvas.width,
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canvas.height
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);
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return new Blob([tiffBuffer]);
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}
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function getCleanFilename(): string {
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let clean = state.files[0].name.replace(/\.pdf$/i, '').trim();
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if (clean.length > 80) {
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clean = clean.slice(0, 80);
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}
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return clean;
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}
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