Function exportDiagram

src/main/electron.js:2369–2646

(event, args, directFinalize)

//TODO Use canvas to export images if math is not used to speedup export (no capturePage). Requires change to export3.html also
function exportDiagram(event, args, directFinalize)
{
	if (event != null && event.senderFrame != null &&
		!validateSender(event.senderFrame)) return null;

	var browser = null;
	
	try
	{
		browser = new BrowserWindow({
			webPreferences: {
				preload: `${__dirname}/electron-preload.js`,
				backgroundThrottling: false,
				contextIsolation: true,
				disableBlinkFeatures: 'Auxclick', // Is this needed?
				// Electron 42 offscreen DPR defaults to 1; force 2 so post-capture img.resize() downsamples [jgraph/drawio-desktop#2422]
				offscreen: { deviceScaleFactor: 2 },
			},
			show : false,
			frame: false,
			enableLargerThanScreen: true,
			transparent: args.format == 'png' && (args.bg == null || args.bg == 'none'),
			parent: windowsRegistry[0] //set parent to first opened window. Not very accurate, but useful when all visible windows are closed
		});

		browser.loadURL(`file://${codeDir}/export3.html`);

		const contents = browser.webContents;
		var from = args.from;
		var to = args.to;
		var pdfs = [];
			
		contents.on('did-finish-load', function()
	    {
			//Set finalize here since it is call in the reply below
			function finalize()
			{
				browser.destroy();
			};
			
			if (directFinalize === true)
			{
				event.finalize = finalize;
			}
			else
			{
				//Destroy the window after response being received by caller
				ipcMain.once('export-finalize', finalize);
			}

			function renderingFinishHandler(e, renderInfo)
			{
				if (!validateSender(e.senderFrame)) return null;

				if (renderInfo == null)
				{
					event.reply('export-error');
					return;