/* Copyright (C) 2000, 2002, 2003, 2006,  Free Software Foundation

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
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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
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package java.awt.image;

import java.awt.Point;
import java.awt.Rectangle;

/**
 * A raster with methods to support updating pixel values.
 * 
 * @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
 */
public class WritableRaster extends Raster
{
  /**
   * Creates a new <code>WritableRaster</code>.
   * 
   * @param sampleModel  the sample model.
   * @param origin  the origin.
   */
  protected WritableRaster(SampleModel sampleModel, Point origin) 
  {
    this(sampleModel, sampleModel.createDataBuffer(), origin);
  }
  
  /**
   * Creates a new <code>WritableRaster</code> instance.
   * 
   * @param sampleModel  the sample model.
   * @param dataBuffer  the data buffer.
   * @param origin  the origin.
   */
  protected WritableRaster(SampleModel sampleModel, DataBuffer dataBuffer, 
                           Point origin)
  {
    this(sampleModel, dataBuffer,
         new Rectangle(origin != null ? origin.x : 0,
                       origin != null ? origin.y : 0,
                       sampleModel.getWidth(), sampleModel.getHeight()),
         origin, null);
  }

  /**
   * Creates a new <code>WritableRaster</code> instance.
   * 
   * @param sampleModel  the sample model.
   * @param dataBuffer  the data buffer.
   * @param aRegion  the raster's bounds.
   * @param sampleModelTranslate  the translation.
   * @param parent  the parent.
   */
  protected WritableRaster(SampleModel sampleModel, 
                           DataBuffer dataBuffer,
                           Rectangle aRegion,
                           Point sampleModelTranslate,
                           WritableRaster parent)
  {
    super(sampleModel, dataBuffer, aRegion, sampleModelTranslate, parent);
  }

  /**
   * Returns the raster's parent, cast as a {@link WritableRaster}.
   * 
   * @return The raster's parent.
   */
  public WritableRaster getWritableParent()
  {
    return (WritableRaster) getParent();
  }
  
  /**
   * @param childMinX
   * @param childMinY
   * @return
   */
  public WritableRaster createWritableTranslatedChild(int childMinX,
                                                      int childMinY)
  {
    return createWritableChild(minX, minY, width, height,
                               childMinX, childMinY, null);
  }

  /**
   * 
   * @param parentX
   * @param parentY
   * @param w
   * @param h
   * @param childMinX
   * @param childMinY
   * @param bandList
   * @return
   */
  public WritableRaster createWritableChild(int parentX, int parentY,
      int w, int h, int childMinX, int childMinY, int[] bandList)
  {
    // This mirrors the code from the super class
    
    if (parentX < minX || parentX + w > minX + width
        || parentY < minY || parentY + h > minY + height)
      throw new RasterFormatException("Child raster extends beyond parent");
    
    SampleModel sm = (bandList == null) ?
      sampleModel :
      sampleModel.createSubsetSampleModel(bandList);

    return new WritableRaster(sm, getDataBuffer(),
                              new Rectangle(childMinX, childMinY, w, h),
                              new Point(sampleModelTranslateX + childMinX -
                                          parentX,
                                        sampleModelTranslateY + childMinY -
                                          parentY),
                              this);
  }
  
  public Raster createChild(int parentX, int parentY, int width,
                            int height, int childMinX, int childMinY,
                            int[] bandList)
  {
    if (parentX < minX || parentX + width > minX + this.width
        || parentY < minY || parentY + height > minY + this.height)
      throw new RasterFormatException("Child raster extends beyond parent");
    
    SampleModel sm = (bandList == null) ?
      sampleModel :
      sampleModel.createSubsetSampleModel(bandList);

    return new WritableRaster(sm, dataBuffer,
        new Rectangle(childMinX, childMinY, width, height),
        new Point(sampleModelTranslateX + childMinX - parentX,
                  sampleModelTranslateY + childMinY - parentY),
        this);
  }

  public void setDataElements(int x, int y, Object inData)
  {
    sampleModel.setDataElements(x - sampleModelTranslateX, 
        y - sampleModelTranslateY, inData, dataBuffer);
  }

  public void setDataElements(int x, int y, Raster inRaster)
  {
    Object dataElements = getDataElements(0, 0, inRaster.getWidth(),
        inRaster.getHeight(), null);
    setDataElements(x, y, dataElements);
  }

  public void setDataElements(int x, int y, int w, int h, Object inData)
  {
    sampleModel.setDataElements(x - sampleModelTranslateX,
        y - sampleModelTranslateY, w, h, inData, dataBuffer);
  }

  /**
   * 
   * @param srcRaster
   */
  public void setRect(Raster srcRaster)
  {
    setRect(0, 0, srcRaster);
  }

  /**
   * 
   * @param dx
   * @param dy
   * @param srcRaster
   */
  public void setRect(int dx, int dy, Raster srcRaster) 
  {
    Rectangle targetUnclipped = new Rectangle(srcRaster.getMinX() + dx,
        srcRaster.getMinY() + dy, srcRaster.getWidth(), srcRaster.getHeight());
        
    Rectangle target = getBounds().intersection(targetUnclipped);

    if (target.isEmpty()) return;
    
    int sx = target.x - dx;
    int sy = target.y - dy;
    
    // FIXME: Do tests on rasters and use get/set data instead.
    
    /* The JDK documentation seems to imply this implementation.
       (the trucation of higher bits), but an implementation using
       get/setDataElements would be more efficient. None of the
       implementations would do anything sensible when the sample
       models don't match.
       
       But this is probably not the place to consider such
       optimizations.*/

    int[] pixels = srcRaster.getPixels(sx, sy, target.width, target.height,
                                       (int[]) null);

    setPixels(target.x, target.y, target.width, target.height, pixels);
  }

  /**
   * Sets the samples for the pixel at (x, y) in the raster to the specified 
   * values. 
   * 
   * @param x  the x-coordinate of the pixel.
   * @param y  the y-coordinate of the pixel.
   * @param iArray  the sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>iArray</code> is <code>null</code>.
   */
  public void setPixel(int x, int y, int[] iArray)
  {
    sampleModel.setPixel(x - sampleModelTranslateX, y - sampleModelTranslateY,
                         iArray, dataBuffer);
  }

  /**
   * Sets the samples for the pixel at (x, y) in the raster to the specified 
   * values. 
   * 
   * @param x  the x-coordinate of the pixel.
   * @param y  the y-coordinate of the pixel.
   * @param fArray  the sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>fArray</code> is <code>null</code>.
   */
  public void setPixel(int x, int y, float[] fArray)
  {
    sampleModel.setPixel(x - sampleModelTranslateX, y - sampleModelTranslateY,
                         fArray, dataBuffer);
  }

  /**
   * Sets the samples for the pixel at (x, y) in the raster to the specified 
   * values. 
   * 
   * @param x  the x-coordinate of the pixel.
   * @param y  the y-coordinate of the pixel.
   * @param dArray  the sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>dArray</code> is <code>null</code>.
   */
  public void setPixel(int x, int y, double[] dArray)
  {
    sampleModel.setPixel(x - sampleModelTranslateX, y - sampleModelTranslateY,
                         dArray, dataBuffer);
  }

  /**
   * Sets the sample values for the pixels in the region specified by 
   * (x, y, w, h) in the raster.  The array is ordered by pixels (that is, all 
   * the samples for the first pixel are grouped together, followed by all the 
   * samples for the second pixel, and so on). 
   *  
   * @param x  the x-coordinate of the top-left pixel.
   * @param y  the y-coordinate of the top-left pixel.
   * @param w  the width of the region of pixels.
   * @param h  the height of the region of pixels.
   * @param iArray  the pixel sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>iArray</code> is <code>null</code>.
   */
  public void setPixels(int x, int y, int w, int h, int[] iArray)
  {
    sampleModel.setPixels(x - sampleModelTranslateX, y - sampleModelTranslateY,
                          w, h, iArray, dataBuffer);
  }

  /**
   * Sets the sample values for the pixels in the region specified by 
   * (x, y, w, h) in the raster.  The array is ordered by pixels (that is, all 
   * the samples for the first pixel are grouped together, followed by all the 
   * samples for the second pixel, and so on). 
   *  
   * @param x  the x-coordinate of the top-left pixel.
   * @param y  the y-coordinate of the top-left pixel.
   * @param w  the width of the region of pixels.
   * @param h  the height of the region of pixels.
   * @param fArray  the pixel sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>fArray</code> is <code>null</code>.
   */
  public void setPixels(int x, int y, int w, int h, float[] fArray)
  {
    sampleModel.setPixels(x - sampleModelTranslateX, y - sampleModelTranslateY,
                          w, h, fArray, dataBuffer);
  }

  /**
   * Sets the sample values for the pixels in the region specified by 
   * (x, y, w, h) in the raster.  The array is ordered by pixels (that is, all 
   * the samples for the first pixel are grouped together, followed by all the 
   * samples for the second pixel, and so on). 
   *  
   * @param x  the x-coordinate of the top-left pixel.
   * @param y  the y-coordinate of the top-left pixel.
   * @param w  the width of the region of pixels.
   * @param h  the height of the region of pixels.
   * @param dArray  the pixel sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>dArray</code> is <code>null</code>.
   */
  public void setPixels(int x, int y, int w, int h, double[] dArray)
  {
    sampleModel.setPixels(x - sampleModelTranslateX, y - sampleModelTranslateY,
                          w, h, dArray, dataBuffer);
  }

  /**
   * Sets the sample value for a band for the pixel at (x, y) in the raster. 
   * 
   * @param x  the x-coordinate of the pixel.
   * @param y  the y-coordinate of the pixel.
   * @param b  the band (in the range <code>0</code> to 
   *     <code>getNumBands() - 1</code>).
   * @param s  the sample value.
   */
  public void setSample(int x, int y, int b, int s)
  {
    sampleModel.setSample(x - sampleModelTranslateX, y - sampleModelTranslateY,
                          b, s, dataBuffer);
  }

  /**
   * Sets the sample value for a band for the pixel at (x, y) in the raster. 
   * 
   * @param x  the x-coordinate of the pixel.
   * @param y  the y-coordinate of the pixel.
   * @param b  the band (in the range <code>0</code> to 
   *     <code>getNumBands() - 1</code>).
   * @param s  the sample value.
   */
  public void setSample(int x, int y, int b, float s)
  {
    sampleModel.setSample(x - sampleModelTranslateX, y - sampleModelTranslateY,
                          b, s, dataBuffer);
  }

  /**
   * Sets the sample value for a band for the pixel at (x, y) in the raster. 
   * 
   * @param x  the x-coordinate of the pixel.
   * @param y  the y-coordinate of the pixel.
   * @param b  the band (in the range <code>0</code> to 
   *     <code>getNumBands() - 1</code>).
   * @param s  the sample value.
   */
  public void setSample(int x, int y, int b, double s)
  {
    sampleModel.setSample(x - sampleModelTranslateX, y - sampleModelTranslateY,
                          b, s, dataBuffer);
  }

  /**
   * Sets the sample values for one band for the pixels in the region 
   * specified by (x, y, w, h) in the raster. 
   * 
   * @param x  the x-coordinate of the top-left pixel.
   * @param y  the y-coordinate of the top-left pixel.
   * @param w  the width of the region of pixels.
   * @param h  the height of the region of pixels.
   * @param b  the band (in the range <code>0</code> to 
   *     </code>getNumBands() - 1</code>).
   * @param iArray  the sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>iArray</code> is <code>null</code>.
   */
  public void setSamples(int x, int y, int w, int h, int b,
                         int[] iArray)
  {
    sampleModel.setSamples(x - sampleModelTranslateX, y - sampleModelTranslateY,
                           w, h, b, iArray, dataBuffer);
  }

  /**
   * Sets the sample values for one band for the pixels in the region 
   * specified by (x, y, w, h) in the raster. 
   * 
   * @param x  the x-coordinate of the top-left pixel.
   * @param y  the y-coordinate of the top-left pixel.
   * @param w  the width of the region of pixels.
   * @param h  the height of the region of pixels.
   * @param b  the band (in the range <code>0</code> to 
   *     </code>getNumBands() - 1</code>).
   * @param fArray  the sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>fArray</code> is <code>null</code>.
   */
  public void setSamples(int x, int y, int w, int h, int b,
                         float[] fArray)
  {
    sampleModel.setSamples(x - sampleModelTranslateX, y - sampleModelTranslateY,
                           w, h, b, fArray, dataBuffer);
  }

  /**
   * Sets the sample values for one band for the pixels in the region 
   * specified by (x, y, w, h) in the raster. 
   * 
   * @param x  the x-coordinate of the top-left pixel.
   * @param y  the y-coordinate of the top-left pixel.
   * @param w  the width of the region of pixels.
   * @param h  the height of the region of pixels.
   * @param b  the band (in the range <code>0</code> to 
   *     </code>getNumBands() - 1</code>).
   * @param dArray  the sample values (<code>null</code> not permitted).
   * 
   * @throws NullPointerException if <code>dArray</code> is <code>null</code>.
   */
  public void setSamples(int x, int y, int w, int h, int b,
                         double[] dArray)
  {
    sampleModel.setSamples(x - sampleModelTranslateX, y - sampleModelTranslateY,
                           w, h, b, dArray, dataBuffer);
  }
}
