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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/java-pdf-library-support/
 *
 * (C) Copyright 1997-2013, IDRsolutions and Contributors.
 *
 * 	This file is part of JPedal
 *
     This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 *
 * ---------------
 * ExampleImageDecodeHandler.java
 * ---------------
 */
package org.jpedal.examples.handlers;

import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;

import org.jpedal.external.ImageHandler;
import org.jpedal.io.ObjectStore;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.PdfObject;

/**
 * example of adding in custom image code , replacing code with a blank image of correct size
 */
public class ExampleImageDecodeHandler implements ImageHandler {

	// tell JPedal if it ignores its own Image code or not
	@Override
	public boolean alwaysIgnoreGenericHandler() {
		return true; // always use this code
	}

	/** tells JPedal not to scale image */
	@Override
	public boolean imageHasBeenScaled() {
		return true;
	}

	@Override
	public boolean drawImageOnscreen(BufferedImage image, int optionsApplied, AffineTransform upside_down, String currentImageFile, Graphics2D g2,
			boolean renderDirect, ObjectStore objectStore, boolean isPrinting) {
		return false; // To change body of implemented methods use File | Settings | File Templates.
	}

	// pass in raw data for image handling - if valid image returned it will be used.
	// if alwaysIgnoreGenericHandler() is true JPedal code always ignored. If false, JPedal code used if null
	@Override
	public BufferedImage processImageData(GraphicsState gs, PdfObject XObject) {

		BufferedImage img;

		// see the raw data
		// System.out.println(values);

		/**
		 * example implementation creates a blank image of correct size
		 */

		/**
		 * workout final size from CTM (assumes no scaling or rotation)
		 */
		int finalWidth = (int) gs.CTM[0][0];
		int finalHeight = (int) gs.CTM[1][1];

		/** allow for image upside down or right to left */
		if (finalWidth < 0) finalWidth = -finalWidth;
		if (finalHeight < 0) finalHeight = -finalHeight;

		img = new BufferedImage(finalWidth, finalHeight, BufferedImage.TYPE_INT_ARGB);

		Graphics2D g2 = (Graphics2D) img.getGraphics();

		AffineTransform aff = new AffineTransform();
		aff.translate(0, -finalHeight);
		aff.scale(1, -1);
		g2.setTransform(aff);

		String message = "Image removed";

		int fontSize = finalWidth / message.length();

		Font font = new Font("serif", Font.PLAIN, fontSize);
		Rectangle2D messageBounds = font.getStringBounds(message, 0, message.length(), g2.getFontRenderContext());

		g2.setFont(font);
		g2.drawString(message, (int) ((finalWidth - messageBounds.getWidth()) / 2), -finalHeight - ((finalHeight) / 2));

		/*** NOTE - IMAGE is expected to be UPSIDE DOWN!!!!! */
		return img;
	}
}