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Extract layer

Extract layers from PDF in Node.js

To extract PDF layers or OCG (optional content group) from a document.

const doc = await PDFNet.PDFDoc.createFromURL(filename);
const page = await doc.getPage(1);

const initCfg = await doc.getOCGConfig();
const ctx = await PDFNet.OCGContext.createFromConfig(initCfg);

const pdfdraw = await PDFNet.PDFDraw.create();
pdfdraw.setImageSize(1000, 1000);

// Disable drawing of content that is not optional (i.e. is not part of any layer).

// Now render each layer in the input document to a separate image.
const ocgs = await doc.getOCGs(); // Get the array of all OCGs in the document.
let i;
const sz = await ocgs.size();
for (i = 0; i < sz; ++i) {
    const ocg = await PDFNet.OCG.createFromObj(await ocgs.getAt(i));
    ctx.setState(ocg, true);
    let fname = 'pdf_layers_';
    fname += await ocg.getName();
    fname += '.png';
    const pageBuffer = await pdfdraw.exportStream(page);
    const imageData = new Blob([pageBuffer], {type: 'image/png'}));

// Now draw content that is not part of any layer...
const nonLayerBuffer = await pdfdraw.exportStream(page);
const data = new Blob([nonLayerBuffer], {type: 'image/png'}));

PDF layers (OCG)
Full sample code which demonstrates how to create, extract, render PDF layers.

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