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/* ReplicateScaleFilter.java -- Java class for filtering images

   Copyright (C) 1999 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 java.awt.image;

import java.util.Hashtable;

/**

 * This filter should be used for fast scaling of images where the result

 * does not need to ensure straight lines are still straight, etc.  The

 * exact method is not defined by Sun but some sort of fast Box filter should

 * probably be correct.

 * <br>

 * Currently this filter does nothing and needs to be implemented.

 *

 * @author C. Brian Jones (cbj@gnu.org)

 */

public class ReplicateScaleFilter extends ImageFilter

{

    public ReplicateScaleFilter(int width, int height) {

        destHeight = height;

        destWidth = width;

    }

    /**

     * The height of the destination image.

     */

    protected int destHeight;

    /**

     * The width of the destination image.

     */

    protected int destWidth;

    /**

     * The height of the source image.

     */

    protected int srcHeight;

    /**

     * The width of the source image.

     */

    protected int srcWidth;

    /**

     *

     */

    protected int srcrows[];

    /**

     *

     */

    protected int srccols[];

    /**

     *

     */

    protected Object outpixbuf;

    /**

     * An <code>ImageProducer</code> indicates the size of the image

     * being produced using this method.  A filter can override this

     * method to intercept these calls from the producer in order to

     * change either the width or the height before in turn calling

     * the consumer's <code>setDimensions</code> method.

     *

     * @param width the width of the image

     * @param height the height of the image

     */

    public void setDimensions(int width, int height)

    {

        srcWidth = width;

        srcHeight = height;

        /* If either destHeight or destWidth is < 0, the image should

           maintain its original aspect ratio.  When both are < 0,

           just maintain the original width and height. */

        if (destWidth < 0 && destHeight < 0)

        {

            destWidth = width;

            destHeight = height;

        }

        else if (destWidth < 0)

        {

            destWidth = width * destHeight / srcHeight;

        }

        else if (destHeight < 0)

        {

            destHeight = height * destWidth / srcWidth;

        }

        if (consumer != null)

          consumer.setDimensions(destWidth, destHeight);

    }

    /**

     * An <code>ImageProducer</code> can set a list of properties

     * associated with this image by using this method.

     *

     * @param props the list of properties associated with this image

     */

    public void setProperties(Hashtable<?, ?> props)

    {

      Hashtable<Object, Object> prop2 = (Hashtable<Object, Object>) props;

      prop2.put("filters", "ReplicateScaleFilter");

      if (consumer != null)

        consumer.setProperties(prop2);

    }

    /**

     * This function delivers a rectangle of pixels where any

     * pixel(m,n) is stored in the array as a <code>byte</code> at

     * index (n * scansize + m + offset).

     *

     * @param x the x coordinate of the rectangle

     * @param y the y coordinate of the rectangle

     * @param w the width of the rectangle

     * @param h the height of the rectangle

     * @param model the <code>ColorModel</code> used to translate the pixels

     * @param pixels the array of pixel values

     * @param offset the index of the first pixels in the <code>pixels</code> array

     * @param scansize the width to use in extracting pixels from the <code>pixels</code> array

     */

    public void setPixels(int x, int y, int w, int h,

           ColorModel model, byte[] pixels, int offset, int scansize)

    {

      if (srcrows == null || srccols == null)

        setupSources();

      int dx1 = (2 * x * destWidth + srcWidth - 1) / (2 * destWidth);

      int dy1 = (2 * y * destHeight + srcHeight - 1) / (2 * destHeight);

      byte[] pix;

      if (outpixbuf != null && outpixbuf instanceof byte[])

        {

          pix = (byte[]) outpixbuf;

        }

      else

        {

          pix = new byte[destWidth];

          outpixbuf = pix;

        }

      int sy, sx;

      for (int yy = dy1; (sy = srcrows[yy]) < y + h; yy++)

        {

          int offs = offset + scansize * (sy - y);

          int xx;

          for (xx = dx1; (sx = srccols[xx]) < x + w; xx++)

            {

              pix[xx] = pixels[offs + sx - x];

            }

          if (xx > dx1)

            {

              consumer.setPixels(dx1, yy, xx - dx1, 1, model, pix, dx1,

                                 destWidth);

            }

        }

    }

    /**

     * This function delivers a rectangle of pixels where any

     * pixel(m,n) is stored in the array as an <code>int</code> at

     * index (n * scansize + m + offset).

     *

     * @param x the x coordinate of the rectangle

     * @param y the y coordinate of the rectangle

     * @param w the width of the rectangle

     * @param h the height of the rectangle

     * @param model the <code>ColorModel</code> used to translate the pixels

     * @param pixels the array of pixel values

     * @param offset the index of the first pixels in the <code>pixels</code> array

     * @param scansize the width to use in extracting pixels from the <code>pixels</code> array

     */

    public void setPixels(int x, int y, int w, int h,

           ColorModel model, int[] pixels, int offset, int scansize)

    {

      if (srcrows == null || srccols == null)

        setupSources();

      int dx1 = (2 * x * destWidth + srcWidth - 1) / (2 * destWidth);

      int dy1 = (2 * y * destHeight + srcHeight - 1) / (2 * destHeight);

      int[] pix;

      if (outpixbuf != null && outpixbuf instanceof int[])

        {

          pix = (int[]) outpixbuf;

        }

      else

        {

          pix = new int[destWidth];

          outpixbuf = pix;

        }

      int sy, sx;

      for (int yy = dy1; (sy = srcrows[yy]) < y + h; yy++)

        {

          int offs = offset + scansize * (sy - y);

          int xx;

          for (xx = dx1; (sx = srccols[xx]) < x + w; xx++)

            {

              pix[xx] = pixels[offs + sx - x];

            }

          if (xx > dx1)

            {

              consumer.setPixels(dx1, yy, xx - dx1, 1, model, pix, dx1,

                                 destWidth);

            }

        }

    }

  /**

   * Sets up the srcrows and srccols arrays.

   */

  private void setupSources()

  {

    srcrows = new int[destHeight + 1];

    for (int y = 0; y <= destHeight; y++)

      {

        srcrows[y] = (2 * y * srcHeight + srcHeight) / (2 * destHeight);

      }

    srccols = new int[destWidth + 1];

    for (int x = 0; x <= destWidth; x++)

      {

        srccols[x] = (2 * x * srcWidth + srcWidth) / (2 * destWidth);

      }

  }

}