/*
 * SVG Salamander
 * Copyright (c) 2004, Mark McKay
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 *   - Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the following
 *     disclaimer.
 *   - Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials 
 *     provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE. 
 * 
 * Mark McKay can be contacted at mark@kitfox.com.  Salamander and other
 * projects can be found at http://www.kitfox.com
 *
 * Created on April 1, 2004, 3:37 AM
 */

package com.kitfox.svg.pattern;

import java.awt.PaintContext;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.kitfox.svg.SVGConst;

/**
 * @author Mark McKay
 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
 */
public class PatternPaintContext implements PaintContext {
	BufferedImage source; // Image we're rendering from
	Rectangle deviceBounds; // int size of rectangle we're rendering to
	// AffineTransform userXform; //xform from user space to device space
	// AffineTransform distortXform; //distortion applied to this pattern

	AffineTransform xform; // distortion applied to this pattern

	int sourceWidth;
	int sourceHeight;

	// Raster we use to build tile
	BufferedImage buf;

	/** Creates a new instance of PatternPaintContext */
	public PatternPaintContext(BufferedImage source, Rectangle deviceBounds,
			AffineTransform userXform, AffineTransform distortXform) {
		// System.err.println("Bounds " + deviceBounds);
		this.source = source;
		this.deviceBounds = deviceBounds;
		try {
			// this.distortXform = distortXform.createInverse();
			// this.userXform = userXform.createInverse();

			// xform = userXform.createInverse();
			// xform.concatenate(distortXform.createInverse());
			xform = distortXform.createInverse();
			xform.concatenate(userXform.createInverse());
		} catch (Exception e) {
			Logger.getLogger(SVGConst.SVG_LOGGER).log(Level.WARNING, null, e);
		}

		sourceWidth = source.getWidth();
		sourceHeight = source.getHeight();
	}

	@Override
	public void dispose() {
	}

	@Override
	public ColorModel getColorModel() {
		return source.getColorModel();
	}

	@Override
	public Raster getRaster(int x, int y, int w, int h) {
		// System.err.println("" + x + ", " + y + ", " + w + ", " + h);
		if (buf == null || buf.getWidth() != w || buf.getHeight() != h) {
			buf = new BufferedImage(w, h, source.getType());
		}

		// Point2D.Float srcPt = new Point2D.Float(), srcPt2 = new
		// Point2D.Float(), destPt = new Point2D.Float();
		Point2D.Float srcPt = new Point2D.Float(), destPt = new Point2D.Float();
		for (int j = 0; j < h; j++) {
			for (int i = 0; i < w; i++) {
				destPt.setLocation(i + x, j + y);

				xform.transform(destPt, srcPt);

				// userXform.transform(destPt, srcPt2);
				// distortXform.transform(srcPt2, srcPt);

				int ii = ((int) srcPt.x) % sourceWidth;
				if (ii < 0) {
					ii += sourceWidth;
				}
				int jj = ((int) srcPt.y) % sourceHeight;
				if (jj < 0) {
					jj += sourceHeight;
				}

				buf.setRGB(i, j, source.getRGB(ii, jj));
			}
		}

		return buf.getData();
	}

}