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/* ImagePaint.java -- Supplies the pixels for image rendering

   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.java.awt.java2d;

import java.awt.Paint;

import java.awt.PaintContext;

import java.awt.Rectangle;

import java.awt.RenderingHints;

import java.awt.Transparency;

import java.awt.geom.AffineTransform;

import java.awt.geom.Rectangle2D;

import java.awt.image.ColorModel;

import java.awt.image.Raster;

import java.awt.image.RenderedImage;

import java.awt.image.WritableRaster;

/**

 * This class is used as a temporary Paint object to supply the pixel values

 * for image rendering using the normal scanline conversion implementation.

 *

 * @author Roman Kennke (kennke@aicas.com)

 */

public class ImagePaint

  implements Paint

{

  /**

   * The PaintContext implementation for the ImagePaint.

   */

  private class ImagePaintContext

    implements PaintContext

  {

    /**

     * The target raster.

     */

    private WritableRaster target;

    /**

     * Nothing to do here.

     */

    public void dispose()

    {

      // Nothing to do here.

    }

    /**

     * Returns the color model.

     *

     * @return the color model

     */

    public ColorModel getColorModel()

    {

      return image.getColorModel();

    }

    /**

     * Supplies the pixel to be rendered.

     *

     * @see PaintContext#getRaster(int, int, int, int)

     */

    public Raster getRaster(int x1, int y1, int w, int h)

    {

      ensureRasterSize(w, h);

      int x2 = x1 + w;

      int y2 = y1 + h;

      float[] src = new float[2];

      float[] dest = new float[2];

      Raster source = image.getData();

      int minX = source.getMinX();

      int maxX = source.getWidth() + minX;

      int minY = source.getMinY();

      int maxY = source.getHeight() + minY;

      Object pixel = null;

      for (int y = y1; y < y2; y++)

        {

          for (int x = x1; x < x2; x++)

            {

              src[0] = x;

              src[1] = y;

              transform.transform(src, 0, dest, 0, 1);

              int dx = (int) dest[0];

              int dy = (int) dest[1];

              // Pixels outside the source image are not of interest, skip

              // them.

              if (dx >= minX && dx < maxX && dy >= minY && dy < maxY)

                {

                  pixel = source.getDataElements(dx, dy, pixel);

                  target.setDataElements(x - x1, y - y1, pixel);

                }

            }

        }

      return target;

    }

    /**

     * Ensures that the target raster exists and has at least the specified

     * size.

     *

     * @param w the requested target width

     * @param h the requested target height

     */

    private void ensureRasterSize(int w, int h)

    {

      if (target == null || target.getWidth() < w || target.getHeight() < h)

        {

          Raster s = image.getData();

          target = s.createCompatibleWritableRaster(w, h);

        }

    }

  }

  /**

   * The image to render.

   */

  RenderedImage image;

  /**

   * The transform from image space to device space. This is the inversed

   * transform of the concatenated

   * transform image space -> user space -> device space transform.

   */

  AffineTransform transform;

  /**

   * Creates a new ImagePaint for rendering the specified image using the

   * specified device space -> image space transform. This transform

   * is the inversed transform of the usual image space -> user space -> device

   * space transform.

   *

   * The ImagePaint will only render the image in the specified area of

   * interest (which is specified in image space).

   *

   * @param i the image to render

   * @param t the device space to user space transform

   */

  ImagePaint(RenderedImage i, AffineTransform t)

  {

    image = i;

    transform = t;

  }

  public PaintContext createContext(ColorModel cm, Rectangle deviceBounds,

                                    Rectangle2D userBounds,

                                    AffineTransform xform,

                                    RenderingHints hints)

  {

    return new ImagePaintContext();

  }

  public int getTransparency()

  {

    return Transparency.OPAQUE;

  }

}