//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2012 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

using System;
using System.IO;

using pdftron;
using pdftron.Common;
using pdftron.Filters;
using pdftron.SDF;
using pdftron.PDF;

namespace PDFNetSamples
{
	class OptimizerSample
	{
		/// <summary>
		/// The following sample illustrates how to reduce PDF file size using the 
		/// Optimizer class. 
		/// 
		/// 'pdftron.PDF.Optimizer' is an optional PDFNet Add-On utility class that can be 
		/// used to optimize PDF documents by reducing the file size, removing redundant 
		/// information, and compressing data streams using the latest in image compression 
		/// technology. PDF Optimizer can compress and shrink PDF file size with the 
		/// following operations:
		/// - Remove duplicated fonts, images, ICC profiles, and any other data stream. 
		/// - Optionally convert high-quality or print-ready PDF files to small, efficient and web-ready PDF. 
		/// - Optionally down-sample large images to a given resolution. 
		/// - Optionally compress or recompress PDF images using JBIG2 and JPEG2000 compression formats. 
		/// - Compress uncompressed streams and remove unused PDF objects. 
		/// </summary>
		static void Main(string[] args)
		{
			PDFNet.Initialize();

			string input_path = "../../../../TestFiles/";
			string output_path = "../../../../TestFiles/Output/";
			string input_filename = "newsletter.pdf";


			//--------------------------------------------------------------------------------
			// Example 1) Simple optimization of a pdf with default settings. 
			//
			try
			{
				using (PDFDoc doc = new PDFDoc(input_path + input_filename))
				{
					doc.InitSecurityHandler();
					Optimizer.Optimize(doc);
					doc.Save(output_path + input_filename + "_opt1.pdf", SDFDoc.SaveOptions.e_linearized);
				}
			}
			catch (PDFNetException e)
			{
				Console.WriteLine(e.Message);
			}
				
			//--------------------------------------------------------------------------------
			// Example 2) Reduce image quality and use jpeg compression for
			// non monochrome images.
			try
			{
				using (PDFDoc doc = new PDFDoc(input_path + input_filename))
				{
					doc.InitSecurityHandler();

					Optimizer.ImageSettings image_settings = new Optimizer.ImageSettings();

					// low quality jpeg compression
					image_settings.SetCompressionMode(Optimizer.ImageSettings.CompressionMode.e_jpeg);
					image_settings.SetQuality(1);

					// Set the output dpi to be standard screen resolution
					image_settings.SetImageDPI(144,96);

					// this option will recompress images not compressed with
					// jpeg compression and use the result if the new image
					// is smaller.
					image_settings.ForceRecompression(true);

					// this option is not commonly used since it can 
					// potentially lead to larger files.  It should be enabled
					// only if the output compression specified should be applied
					// to every image of a given type regardless of the output image size
					//image_settings.ForceChanges(true);

					// use the same settings for both color and grayscale images
					Optimizer.OptimizerSettings opt_settings = new Optimizer.OptimizerSettings();
					opt_settings.SetColorImageSettings(image_settings);
					opt_settings.SetGrayscaleImageSettings(image_settings);

					
					Optimizer.Optimize(doc, opt_settings);

					doc.Save(output_path + input_filename + "_opt2.pdf", SDFDoc.SaveOptions.e_linearized);
				}
			}
			catch (PDFNetException e)
			{
				Console.WriteLine(e.Message);
			}


			//--------------------------------------------------------------------------------
			// Example 3) Use monochrome image settings and default settings
			// for color and grayscale images. 
			try
			{
				using (PDFDoc doc = new PDFDoc(input_path + input_filename))
				{
					doc.InitSecurityHandler();

					Optimizer.MonoImageSettings mono_image_settings = new Optimizer.MonoImageSettings();

					mono_image_settings.SetCompressionMode(Optimizer.MonoImageSettings.CompressionMode.e_jbig2);
					mono_image_settings.ForceRecompression(true);

					Optimizer.OptimizerSettings opt_settings = new Optimizer.OptimizerSettings();
					opt_settings.SetMonoImageSettings(mono_image_settings);

					Optimizer.Optimize(doc, opt_settings);

					doc.Save(output_path + input_filename + "_opt3.pdf", SDFDoc.SaveOptions.e_linearized);
				}
			}
			catch (PDFNetException e)
			{
				Console.WriteLine(e.Message);
			}


			PDFNet.Terminate();
		}
	}
}