117 lines
3.9 KiB
TypeScript
117 lines
3.9 KiB
TypeScript
import { ClassicPreset } from 'rete';
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import { BaseWorkflowNode } from './base-node';
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import { pdfSocket } from '../sockets';
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import type { SocketData } from '../types';
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import { requirePdfInput, processBatch } from '../types';
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import { PDFDocument } from 'pdf-lib';
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import * as pdfjsLib from 'pdfjs-dist';
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export class PosterizeNode extends BaseWorkflowNode {
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readonly category = 'Organize & Manage' as const;
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readonly icon = 'ph-notepad';
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readonly description = 'Split pages into tile grid for poster printing';
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constructor() {
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super('Posterize');
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this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
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this.addOutput(
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'pdf',
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new ClassicPreset.Output(pdfSocket, 'Posterized PDF')
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);
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this.addControl(
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'rows',
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new ClassicPreset.InputControl('number', { initial: 2 })
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);
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this.addControl(
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'cols',
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new ClassicPreset.InputControl('number', { initial: 2 })
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);
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}
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async data(
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inputs: Record<string, SocketData[]>
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): Promise<Record<string, SocketData>> {
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const pdfInputs = requirePdfInput(inputs, 'Posterize');
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const rowsCtrl = this.controls['rows'] as
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| ClassicPreset.InputControl<'number'>
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| undefined;
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const colsCtrl = this.controls['cols'] as
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| ClassicPreset.InputControl<'number'>
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| undefined;
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const rows = Math.max(1, Math.min(8, rowsCtrl?.value ?? 2));
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const cols = Math.max(1, Math.min(8, colsCtrl?.value ?? 2));
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return {
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pdf: await processBatch(pdfInputs, async (input) => {
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const pdfjsDoc = await pdfjsLib.getDocument({ data: input.bytes })
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.promise;
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const newDoc = 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: 2.0 });
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const canvas = document.createElement('canvas');
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canvas.width = viewport.width;
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canvas.height = viewport.height;
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const ctx = canvas.getContext('2d');
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if (!ctx)
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throw new Error(`Failed to get canvas context for page ${i}`);
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await page.render({ canvasContext: ctx, viewport, canvas }).promise;
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const tileW = viewport.width / cols;
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const tileH = viewport.height / rows;
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for (let r = 0; r < rows; r++) {
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for (let c = 0; c < cols; c++) {
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const tileCanvas = document.createElement('canvas');
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tileCanvas.width = tileW;
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tileCanvas.height = tileH;
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const tileCtx = tileCanvas.getContext('2d');
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if (!tileCtx)
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throw new Error('Failed to get tile canvas context');
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tileCtx.drawImage(
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canvas,
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c * tileW,
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r * tileH,
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tileW,
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tileH,
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0,
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0,
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tileW,
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tileH
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);
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const pngBlob = await new Promise<Blob | null>((resolve) =>
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tileCanvas.toBlob(resolve, 'image/png')
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);
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if (!pngBlob)
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throw new Error(
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`Failed to render tile (row ${r}, col ${c}) of page ${i}`
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);
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const pngBytes = new Uint8Array(await pngBlob.arrayBuffer());
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const pngImage = await newDoc.embedPng(pngBytes);
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const newPage = newDoc.addPage([tileW / 2, tileH / 2]);
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newPage.drawImage(pngImage, {
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x: 0,
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y: 0,
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width: tileW / 2,
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height: tileH / 2,
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});
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}
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}
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}
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const pdfBytes = new Uint8Array(await newDoc.save());
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return {
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type: 'pdf',
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document: newDoc,
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bytes: pdfBytes,
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filename: input.filename.replace(/\.pdf$/i, '_posterized.pdf'),
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};
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}),
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};
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}
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}
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