Stirling-PDF/shared-operations/functions/scaleContent.js
2023-10-23 18:08:28 +03:00

27 lines
842 B
JavaScript

export async function scaleContent(snapshot, scaleFactor, PDFLib) {
// Load the original PDF file
const pdfDoc = await PDFLib.PDFDocument.load(snapshot, {
parseSpeed: PDFLib.ParseSpeeds.Fastest,
});
const pages = pdfDoc.getPages();
pages.forEach(page => {
const width = page.getWidth();
const height = page.getHeight();
// Scale content
page.scaleContent(scaleFactor, scaleFactor);
const scaled_diff = {
width: Math.round(width - scaleFactor * width),
height: Math.round(height - scaleFactor * height),
};
// Center content in new page format
page.translateContent(Math.round(scaled_diff.width / 2), Math.round(scaled_diff.height / 2));
});
// Serialize the modified document
return pdfDoc.save();
};