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feat:Setup Prettier for code formatting
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@@ -1,279 +1,352 @@
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import { showLoader, hideLoader, showAlert } from '../ui.js';
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import { downloadFile, readFileAsArrayBuffer, formatBytes } from '../utils/helpers.js';
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import {
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downloadFile,
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readFileAsArrayBuffer,
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formatBytes,
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} from '../utils/helpers.js';
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import { state } from '../state.js';
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import * as pdfjsLib from 'pdfjs-dist';
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import { PDFDocument, PDFName, PDFDict, PDFStream, PDFNumber } from 'pdf-lib';
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function dataUrlToBytes(dataUrl: any) {
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const base64 = dataUrl.split(',')[1];
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const binaryString = atob(base64);
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const len = binaryString.length;
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const bytes = new Uint8Array(len);
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for (let i = 0; i < len; i++) {
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bytes[i] = binaryString.charCodeAt(i);
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}
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return bytes;
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const base64 = dataUrl.split(',')[1];
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const binaryString = atob(base64);
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const len = binaryString.length;
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const bytes = new Uint8Array(len);
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for (let i = 0; i < len; i++) {
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bytes[i] = binaryString.charCodeAt(i);
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}
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return bytes;
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}
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async function performSmartCompression(arrayBuffer: any, settings: any) {
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const pdfDoc = await PDFDocument.load(arrayBuffer, { ignoreEncryption: true });
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const pages = pdfDoc.getPages();
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const pdfDoc = await PDFDocument.load(arrayBuffer, {
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ignoreEncryption: true,
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});
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const pages = pdfDoc.getPages();
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if (settings.removeMetadata) {
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try {
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pdfDoc.setTitle('');
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pdfDoc.setAuthor('');
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pdfDoc.setSubject('');
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pdfDoc.setKeywords([]);
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pdfDoc.setCreator('');
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pdfDoc.setProducer('');
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} catch (e) {
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console.warn('Could not remove metadata:', e);
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}
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if (settings.removeMetadata) {
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try {
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pdfDoc.setTitle('');
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pdfDoc.setAuthor('');
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pdfDoc.setSubject('');
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pdfDoc.setKeywords([]);
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pdfDoc.setCreator('');
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pdfDoc.setProducer('');
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} catch (e) {
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console.warn('Could not remove metadata:', e);
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}
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}
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for (let i = 0; i < pages.length; i++) {
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const page = pages[i];
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const resources = page.node.Resources();
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if (!resources) continue;
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for (let i = 0; i < pages.length; i++) {
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const page = pages[i];
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const resources = page.node.Resources();
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if (!resources) continue;
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const xobjects = resources.lookup(PDFName.of('XObject'));
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if (!(xobjects instanceof PDFDict)) continue;
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const xobjects = resources.lookup(PDFName.of('XObject'));
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if (!(xobjects instanceof PDFDict)) continue;
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for (const [key, value] of xobjects.entries()) {
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const stream = pdfDoc.context.lookup(value);
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if (!(stream instanceof PDFStream) || stream.dict.get(PDFName.of('Subtype')) !== PDFName.of('Image')) continue;
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for (const [key, value] of xobjects.entries()) {
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const stream = pdfDoc.context.lookup(value);
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if (
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!(stream instanceof PDFStream) ||
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stream.dict.get(PDFName.of('Subtype')) !== PDFName.of('Image')
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)
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continue;
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try {
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const imageBytes = stream.getContents();
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if (imageBytes.length < settings.skipSize) continue;
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try {
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const imageBytes = stream.getContents();
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if (imageBytes.length < settings.skipSize) continue;
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const width = stream.dict.get(PDFName.of('Width')) instanceof PDFNumber
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? (stream.dict.get(PDFName.of('Width')) as PDFNumber).asNumber()
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: 0;
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const height = stream.dict.get(PDFName.of('Height')) instanceof PDFNumber
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? (stream.dict.get(PDFName.of('Height')) as PDFNumber).asNumber()
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: 0;
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const bitsPerComponent = stream.dict.get(PDFName.of('BitsPerComponent')) instanceof PDFNumber
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? (stream.dict.get(PDFName.of('BitsPerComponent')) as PDFNumber).asNumber()
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: 8;
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const width =
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stream.dict.get(PDFName.of('Width')) instanceof PDFNumber
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? (stream.dict.get(PDFName.of('Width')) as PDFNumber).asNumber()
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: 0;
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const height =
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stream.dict.get(PDFName.of('Height')) instanceof PDFNumber
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? (stream.dict.get(PDFName.of('Height')) as PDFNumber).asNumber()
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: 0;
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const bitsPerComponent =
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stream.dict.get(PDFName.of('BitsPerComponent')) instanceof PDFNumber
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? (
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stream.dict.get(PDFName.of('BitsPerComponent')) as PDFNumber
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).asNumber()
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: 8;
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if (width > 0 && height > 0) {
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let newWidth = width;
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let newHeight = height;
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if (width > 0 && height > 0) {
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let newWidth = width;
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let newHeight = height;
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const scaleFactor = settings.scaleFactor || 1.0;
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newWidth = Math.floor(width * scaleFactor);
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newHeight = Math.floor(height * scaleFactor);
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const scaleFactor = settings.scaleFactor || 1.0;
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newWidth = Math.floor(width * scaleFactor);
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newHeight = Math.floor(height * scaleFactor);
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if (newWidth > settings.maxWidth || newHeight > settings.maxHeight) {
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const aspectRatio = newWidth / newHeight;
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if (newWidth > newHeight) {
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newWidth = Math.min(newWidth, settings.maxWidth);
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newHeight = newWidth / aspectRatio;
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} else {
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newHeight = Math.min(newHeight, settings.maxHeight);
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newWidth = newHeight * aspectRatio;
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}
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}
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const minDim = settings.minDimension || 50;
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if (newWidth < minDim || newHeight < minDim) continue;
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const canvas = document.createElement('canvas');
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const ctx = canvas.getContext('2d');
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canvas.width = Math.floor(newWidth);
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canvas.height = Math.floor(newHeight);
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const img = new Image();
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const imageUrl = URL.createObjectURL(new Blob([new Uint8Array(imageBytes)]));
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await new Promise((resolve, reject) => {
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img.onload = resolve;
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img.onerror = reject;
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img.src = imageUrl;
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});
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ctx.imageSmoothingEnabled = settings.smoothing !== false;
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ctx.imageSmoothingQuality = settings.smoothingQuality || 'medium';
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if (settings.grayscale) {
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ctx.filter = 'grayscale(100%)';
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} else if (settings.contrast) {
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ctx.filter = `contrast(${settings.contrast}) brightness(${settings.brightness || 1})`;
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}
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ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
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let bestBytes = null;
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let bestSize = imageBytes.length;
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const jpegDataUrl = canvas.toDataURL('image/jpeg', settings.quality);
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const jpegBytes = dataUrlToBytes(jpegDataUrl);
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if (jpegBytes.length < bestSize) {
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bestBytes = jpegBytes;
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bestSize = jpegBytes.length;
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}
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if (settings.tryWebP) {
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try {
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const webpDataUrl = canvas.toDataURL('image/webp', settings.quality);
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const webpBytes = dataUrlToBytes(webpDataUrl);
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if (webpBytes.length < bestSize) {
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bestBytes = webpBytes;
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bestSize = webpBytes.length;
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}
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} catch (e) { /* WebP not supported */ }
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}
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if (bestBytes && bestSize < imageBytes.length * settings.threshold) {
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(stream as any).contents = bestBytes;
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stream.dict.set(PDFName.of('Length'), PDFNumber.of(bestSize));
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stream.dict.set(PDFName.of('Width'), PDFNumber.of(canvas.width));
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stream.dict.set(PDFName.of('Height'), PDFNumber.of(canvas.height));
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stream.dict.set(PDFName.of('Filter'), PDFName.of('DCTDecode'));
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stream.dict.delete(PDFName.of('DecodeParms'));
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stream.dict.set(PDFName.of('BitsPerComponent'), PDFNumber.of(8));
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if (settings.grayscale) {
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stream.dict.set(PDFName.of('ColorSpace'), PDFName.of('DeviceGray'));
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}
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}
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URL.revokeObjectURL(imageUrl);
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}
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} catch (error) {
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console.warn('Skipping an uncompressible image in smart mode:', error);
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if (newWidth > settings.maxWidth || newHeight > settings.maxHeight) {
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const aspectRatio = newWidth / newHeight;
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if (newWidth > newHeight) {
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newWidth = Math.min(newWidth, settings.maxWidth);
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newHeight = newWidth / aspectRatio;
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} else {
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newHeight = Math.min(newHeight, settings.maxHeight);
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newWidth = newHeight * aspectRatio;
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}
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}
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const minDim = settings.minDimension || 50;
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if (newWidth < minDim || newHeight < minDim) continue;
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const canvas = document.createElement('canvas');
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const ctx = canvas.getContext('2d');
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canvas.width = Math.floor(newWidth);
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canvas.height = Math.floor(newHeight);
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const img = new Image();
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const imageUrl = URL.createObjectURL(
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new Blob([new Uint8Array(imageBytes)])
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);
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await new Promise((resolve, reject) => {
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img.onload = resolve;
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img.onerror = reject;
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img.src = imageUrl;
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});
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ctx.imageSmoothingEnabled = settings.smoothing !== false;
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ctx.imageSmoothingQuality = settings.smoothingQuality || 'medium';
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if (settings.grayscale) {
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ctx.filter = 'grayscale(100%)';
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} else if (settings.contrast) {
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ctx.filter = `contrast(${settings.contrast}) brightness(${settings.brightness || 1})`;
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}
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ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
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let bestBytes = null;
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let bestSize = imageBytes.length;
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const jpegDataUrl = canvas.toDataURL('image/jpeg', settings.quality);
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const jpegBytes = dataUrlToBytes(jpegDataUrl);
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if (jpegBytes.length < bestSize) {
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bestBytes = jpegBytes;
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bestSize = jpegBytes.length;
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}
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if (settings.tryWebP) {
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try {
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const webpDataUrl = canvas.toDataURL(
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'image/webp',
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settings.quality
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);
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const webpBytes = dataUrlToBytes(webpDataUrl);
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if (webpBytes.length < bestSize) {
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bestBytes = webpBytes;
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bestSize = webpBytes.length;
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}
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} catch (e) {
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/* WebP not supported */
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}
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}
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if (bestBytes && bestSize < imageBytes.length * settings.threshold) {
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(stream as any).contents = bestBytes;
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stream.dict.set(PDFName.of('Length'), PDFNumber.of(bestSize));
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stream.dict.set(PDFName.of('Width'), PDFNumber.of(canvas.width));
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stream.dict.set(PDFName.of('Height'), PDFNumber.of(canvas.height));
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stream.dict.set(PDFName.of('Filter'), PDFName.of('DCTDecode'));
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stream.dict.delete(PDFName.of('DecodeParms'));
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stream.dict.set(PDFName.of('BitsPerComponent'), PDFNumber.of(8));
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if (settings.grayscale) {
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stream.dict.set(
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PDFName.of('ColorSpace'),
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PDFName.of('DeviceGray')
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);
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}
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}
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URL.revokeObjectURL(imageUrl);
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}
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} catch (error) {
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console.warn('Skipping an uncompressible image in smart mode:', error);
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}
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}
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}
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const saveOptions = {
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useObjectStreams: settings.useObjectStreams !== false,
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addDefaultPage: false,
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objectsPerTick: settings.objectsPerTick || 50
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};
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const saveOptions = {
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useObjectStreams: settings.useObjectStreams !== false,
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addDefaultPage: false,
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objectsPerTick: settings.objectsPerTick || 50,
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};
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return await pdfDoc.save(saveOptions);
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return await pdfDoc.save(saveOptions);
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}
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async function performLegacyCompression(arrayBuffer: any, settings: any) {
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pdfjsLib.GlobalWorkerOptions.workerSrc = new URL(
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'pdfjs-dist/build/pdf.worker.min.mjs',
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import.meta.url
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).toString();
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pdfjsLib.GlobalWorkerOptions.workerSrc = new URL(
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'pdfjs-dist/build/pdf.worker.min.mjs',
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import.meta.url
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).toString();
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const pdfJsDoc = await pdfjsLib.getDocument({ data: arrayBuffer }).promise;
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const newPdfDoc = await PDFDocument.create();
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const pdfJsDoc = await pdfjsLib.getDocument({ data: arrayBuffer }).promise;
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const newPdfDoc = await PDFDocument.create();
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for (let i = 1; i <= pdfJsDoc.numPages; i++) {
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const page = await pdfJsDoc.getPage(i);
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const viewport = page.getViewport({ scale: settings.scale });
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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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for (let i = 1; i <= pdfJsDoc.numPages; i++) {
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const page = await pdfJsDoc.getPage(i);
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const viewport = page.getViewport({ scale: settings.scale });
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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({ canvasContext: context, viewport, canvas: canvas }).promise;
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await page.render({ canvasContext: context, viewport, canvas: canvas })
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.promise;
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const jpegBlob = await new Promise(resolve => canvas.toBlob(resolve, 'image/jpeg', settings.quality));
|
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// @ts-expect-error TS(2339) FIXME: Property 'arrayBuffer' does not exist on type 'unk... Remove this comment to see the full error message
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const jpegBytes = await jpegBlob.arrayBuffer();
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const jpegImage = await newPdfDoc.embedJpg(jpegBytes);
|
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const newPage = newPdfDoc.addPage([viewport.width, viewport.height]);
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newPage.drawImage(jpegImage, { x: 0, y: 0, width: viewport.width, height: viewport.height });
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}
|
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return await newPdfDoc.save();
|
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const jpegBlob = await new Promise((resolve) =>
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canvas.toBlob(resolve, 'image/jpeg', settings.quality)
|
||||
);
|
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// @ts-expect-error TS(2339) FIXME: Property 'arrayBuffer' does not exist on type 'unk... Remove this comment to see the full error message
|
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const jpegBytes = await jpegBlob.arrayBuffer();
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const jpegImage = await newPdfDoc.embedJpg(jpegBytes);
|
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const newPage = newPdfDoc.addPage([viewport.width, viewport.height]);
|
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newPage.drawImage(jpegImage, {
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x: 0,
|
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y: 0,
|
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width: viewport.width,
|
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height: viewport.height,
|
||||
});
|
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}
|
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return await newPdfDoc.save();
|
||||
}
|
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|
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export async function compress() {
|
||||
// @ts-expect-error TS(2339) FIXME: Property 'value' does not exist on type 'HTMLEleme... Remove this comment to see the full error message
|
||||
const level = document.getElementById('compression-level').value;
|
||||
// @ts-expect-error TS(2339) FIXME: Property 'value' does not exist on type 'HTMLEleme... Remove this comment to see the full error message
|
||||
const algorithm = document.getElementById('compression-algorithm').value;
|
||||
// @ts-expect-error TS(2339) FIXME: Property 'value' does not exist on type 'HTMLEleme... Remove this comment to see the full error message
|
||||
const level = document.getElementById('compression-level').value;
|
||||
// @ts-expect-error TS(2339) FIXME: Property 'value' does not exist on type 'HTMLEleme... Remove this comment to see the full error message
|
||||
const algorithm = document.getElementById('compression-algorithm').value;
|
||||
|
||||
const settings = {
|
||||
'balanced': {
|
||||
smart: { quality: 0.5, threshold: 0.95, maxWidth: 1800, maxHeight: 1800, skipSize: 3000 },
|
||||
legacy: { scale: 1.5, quality: 0.6 }
|
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},
|
||||
'high-quality': {
|
||||
smart: { quality: 0.70, threshold: 0.98, maxWidth: 2500, maxHeight: 2500, skipSize: 5000 },
|
||||
legacy: { scale: 2.0, quality: 0.9 }
|
||||
},
|
||||
'small-size': {
|
||||
smart: { quality: 0.3, threshold: 0.95, maxWidth: 1200, maxHeight: 1200, skipSize: 2000 },
|
||||
legacy: { scale: 1.2, quality: 0.4 }
|
||||
},
|
||||
'extreme': {
|
||||
smart: { quality: 0.1, threshold: 0.95, maxWidth: 1000, maxHeight: 1000, skipSize: 1000 },
|
||||
legacy: { scale: 1.0, quality: 0.2 }
|
||||
}
|
||||
};
|
||||
const settings = {
|
||||
balanced: {
|
||||
smart: {
|
||||
quality: 0.5,
|
||||
threshold: 0.95,
|
||||
maxWidth: 1800,
|
||||
maxHeight: 1800,
|
||||
skipSize: 3000,
|
||||
},
|
||||
legacy: { scale: 1.5, quality: 0.6 },
|
||||
},
|
||||
'high-quality': {
|
||||
smart: {
|
||||
quality: 0.7,
|
||||
threshold: 0.98,
|
||||
maxWidth: 2500,
|
||||
maxHeight: 2500,
|
||||
skipSize: 5000,
|
||||
},
|
||||
legacy: { scale: 2.0, quality: 0.9 },
|
||||
},
|
||||
'small-size': {
|
||||
smart: {
|
||||
quality: 0.3,
|
||||
threshold: 0.95,
|
||||
maxWidth: 1200,
|
||||
maxHeight: 1200,
|
||||
skipSize: 2000,
|
||||
},
|
||||
legacy: { scale: 1.2, quality: 0.4 },
|
||||
},
|
||||
extreme: {
|
||||
smart: {
|
||||
quality: 0.1,
|
||||
threshold: 0.95,
|
||||
maxWidth: 1000,
|
||||
maxHeight: 1000,
|
||||
skipSize: 1000,
|
||||
},
|
||||
legacy: { scale: 1.0, quality: 0.2 },
|
||||
},
|
||||
};
|
||||
|
||||
const smartSettings = { ...settings[level].smart, removeMetadata: true };
|
||||
const legacySettings = settings[level].legacy;
|
||||
const smartSettings = { ...settings[level].smart, removeMetadata: true };
|
||||
const legacySettings = settings[level].legacy;
|
||||
|
||||
try {
|
||||
const originalFile = state.files[0];
|
||||
const arrayBuffer = await readFileAsArrayBuffer(originalFile);
|
||||
try {
|
||||
const originalFile = state.files[0];
|
||||
const arrayBuffer = await readFileAsArrayBuffer(originalFile);
|
||||
|
||||
let resultBytes;
|
||||
let usedMethod;
|
||||
let resultBytes;
|
||||
let usedMethod;
|
||||
|
||||
if (algorithm === 'vector') {
|
||||
showLoader('Running Vector (Smart) compression...');
|
||||
resultBytes = await performSmartCompression(arrayBuffer, smartSettings);
|
||||
usedMethod = 'Vector';
|
||||
} else if (algorithm === 'photon') {
|
||||
showLoader('Running Photon (Rasterize) compression...');
|
||||
resultBytes = await performLegacyCompression(arrayBuffer, legacySettings);
|
||||
usedMethod = 'Photon';
|
||||
} else {
|
||||
showLoader('Running Automatic (Vector first)...');
|
||||
const vectorResultBytes = await performSmartCompression(arrayBuffer, smartSettings);
|
||||
if (algorithm === 'vector') {
|
||||
showLoader('Running Vector (Smart) compression...');
|
||||
resultBytes = await performSmartCompression(arrayBuffer, smartSettings);
|
||||
usedMethod = 'Vector';
|
||||
} else if (algorithm === 'photon') {
|
||||
showLoader('Running Photon (Rasterize) compression...');
|
||||
resultBytes = await performLegacyCompression(arrayBuffer, legacySettings);
|
||||
usedMethod = 'Photon';
|
||||
} else {
|
||||
showLoader('Running Automatic (Vector first)...');
|
||||
const vectorResultBytes = await performSmartCompression(
|
||||
arrayBuffer,
|
||||
smartSettings
|
||||
);
|
||||
|
||||
if (vectorResultBytes.length < originalFile.size) {
|
||||
resultBytes = vectorResultBytes;
|
||||
usedMethod = 'Vector (Automatic)';
|
||||
} else {
|
||||
// @ts-expect-error TS(2554) FIXME: Expected 2 arguments, but got 3.
|
||||
showAlert('Vector failed to reduce size. Trying Photon...', 'info', 3000);
|
||||
showLoader('Running Automatic (Photon fallback)...');
|
||||
resultBytes = await performLegacyCompression(arrayBuffer, legacySettings);
|
||||
usedMethod = 'Photon (Automatic)';
|
||||
}
|
||||
}
|
||||
|
||||
const originalSize = formatBytes(originalFile.size);
|
||||
const compressedSize = formatBytes(resultBytes.length);
|
||||
const savings = originalFile.size - resultBytes.length;
|
||||
const savingsPercent = savings > 0 ? ((savings / originalFile.size) * 100).toFixed(1) : 0;
|
||||
|
||||
if (savings > 0) {
|
||||
showAlert(
|
||||
'Compression Complete',
|
||||
`Method: **${usedMethod}**. ` +
|
||||
`File size reduced from ${originalSize} to ${compressedSize} (Saved ${savingsPercent}%).`
|
||||
);
|
||||
} else {
|
||||
showAlert(
|
||||
'Compression Finished',
|
||||
`Method: **${usedMethod}**. ` +
|
||||
`Could not reduce file size. Original: ${originalSize}, New: ${compressedSize}.`,
|
||||
// @ts-expect-error TS(2554) FIXME: Expected 2 arguments, but got 3.
|
||||
'warning'
|
||||
);
|
||||
}
|
||||
|
||||
downloadFile(new Blob([resultBytes], { type: 'application/pdf' }), 'compressed-final.pdf');
|
||||
|
||||
} catch (e) {
|
||||
console.error(e);
|
||||
if (vectorResultBytes.length < originalFile.size) {
|
||||
resultBytes = vectorResultBytes;
|
||||
usedMethod = 'Vector (Automatic)';
|
||||
} else {
|
||||
// @ts-expect-error TS(2554) FIXME: Expected 2 arguments, but got 3.
|
||||
showAlert('Error', `An error occurred during compression. Error: ${e.message}`, 'error');
|
||||
} finally {
|
||||
hideLoader();
|
||||
showAlert(
|
||||
'Vector failed to reduce size. Trying Photon...',
|
||||
'info',
|
||||
3000
|
||||
);
|
||||
showLoader('Running Automatic (Photon fallback)...');
|
||||
resultBytes = await performLegacyCompression(
|
||||
arrayBuffer,
|
||||
legacySettings
|
||||
);
|
||||
usedMethod = 'Photon (Automatic)';
|
||||
}
|
||||
}
|
||||
|
||||
const originalSize = formatBytes(originalFile.size);
|
||||
const compressedSize = formatBytes(resultBytes.length);
|
||||
const savings = originalFile.size - resultBytes.length;
|
||||
const savingsPercent =
|
||||
savings > 0 ? ((savings / originalFile.size) * 100).toFixed(1) : 0;
|
||||
|
||||
if (savings > 0) {
|
||||
showAlert(
|
||||
'Compression Complete',
|
||||
`Method: **${usedMethod}**. ` +
|
||||
`File size reduced from ${originalSize} to ${compressedSize} (Saved ${savingsPercent}%).`
|
||||
);
|
||||
} else {
|
||||
showAlert(
|
||||
'Compression Finished',
|
||||
`Method: **${usedMethod}**. ` +
|
||||
`Could not reduce file size. Original: ${originalSize}, New: ${compressedSize}.`,
|
||||
// @ts-expect-error TS(2554) FIXME: Expected 2 arguments, but got 3.
|
||||
'warning'
|
||||
);
|
||||
}
|
||||
|
||||
downloadFile(
|
||||
new Blob([resultBytes], { type: 'application/pdf' }),
|
||||
'compressed-final.pdf'
|
||||
);
|
||||
} catch (e) {
|
||||
console.error(e);
|
||||
// @ts-expect-error TS(2554) FIXME: Expected 2 arguments, but got 3.
|
||||
showAlert(
|
||||
'Error',
|
||||
`An error occurred during compression. Error: ${e.message}`,
|
||||
'error'
|
||||
);
|
||||
} finally {
|
||||
hideLoader();
|
||||
}
|
||||
}
|
||||
Reference in new issue
Block a user