/* Copyright (C) 2000, 2001  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package java.awt.image;

/**
 * @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
 */
public abstract class SampleModel
{
  /** Width of image described. */
  protected int width;
  
  /** Height of image described. */
  protected int height;
  
  /** Number of bands in the image described. */
  protected int numBands;

  /** 
   * The DataBuffer type that is used to store the data of the image
   * described.
   */
  protected int dataType;

  public SampleModel(int dataType, int w, int h, int numBands)
  {
    if ((w<=0) || (h<=0)) throw new IllegalArgumentException();
	
    // FIXME: How can an int be greater than Integer.MAX_VALUE?
    // FIXME: How do we identify an unsupported data type?

    this.dataType = dataType;
    this.width = w;
    this.height = h;
    this.numBands = numBands;  
  }

  public final int getWidth()
  {
    return width;
  }

  public final int getHeight()
  {
    return height;
  }

  public final int getNumBands()
  {
    return numBands;
  }
    
  public abstract int getNumDataElements();
  
  public final int getDataType()
  {
    return dataType;
  }

  public int getTransferType()
  {
    // FIXME: Is this a reasonable default implementation?
    return dataType;
  }

  public int[] getPixel(int x, int y, int[] iArray, DataBuffer data)
  {
    if (iArray == null) iArray = new int[numBands];
    for (int b=0; b<numBands; b++) iArray[b] = getSample(x, y, b, data);
    return iArray;
  }
  
  /**
   *
   * This method is provided as a faster alternative to getPixel(),
   * that can be used when there is no need to decode the pixel into
   * separate sample values.
   *
   * @param obj An array to return the pixel data in. If null, an
   * array of the right type and size will be created.
   *
   * @return A single pixel as an array object of a primitive type,
   * based on the transfer type. Eg. if transfer type is
   * DataBuffer.TYPE_USHORT, then a short[] object is returned.
   */
  public abstract Object getDataElements(int x, int y, Object obj,
					 DataBuffer data);

    
  public Object getDataElements(int x, int y, int w, int h, Object obj,
				DataBuffer data)
  {
    int size = w*h;
    int numDataElements = getNumDataElements();
    int dataSize = numDataElements*size;
    
    if (obj == null)
      {
	switch (getTransferType())
	  {
	  case DataBuffer.TYPE_BYTE:
	    obj = new byte[dataSize];
	    break;
	  case DataBuffer.TYPE_USHORT:
	    obj = new short[dataSize];
	    break;
	  case DataBuffer.TYPE_INT:
	    obj = new int[dataSize];
	    break;
	  default:
	    // Seems like the only sensible thing to do.
	    throw new ClassCastException();
	  }
      }
    Object pixelData = null;
    int outOffset = 0;
    for (int yy = y; yy<(y+h); yy++)
      {
	for (int xx = x; xx<(x+w); xx++)
	  {
	    pixelData = getDataElements(xx, yy, pixelData, data);
	    System.arraycopy(pixelData, 0, obj, outOffset,
			     numDataElements);
	    outOffset += numDataElements;
	  }
      }
    return obj;
  }

  public abstract void setDataElements(int x, int y, Object obj,
				       DataBuffer data);

  public void setDataElements(int x, int y, int w, int h,
			      Object obj, DataBuffer data)
  {
    int size = w*h;
    int numDataElements = getNumDataElements();
    int dataSize = numDataElements*size;
    
    Object pixelData;
    switch (getTransferType())
      {
      case DataBuffer.TYPE_BYTE:
	pixelData = new byte[numDataElements];
	break;
      case DataBuffer.TYPE_USHORT:
	pixelData = new short[numDataElements];
	break;
      case DataBuffer.TYPE_INT:
	pixelData = new int[numDataElements];
	break;
      default:
	// Seems like the only sensible thing to do.
	throw new ClassCastException();
      }
    int inOffset = 0;

    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    System.arraycopy(obj, inOffset, pixelData, 0,
			     numDataElements);
	    setDataElements(xx, yy, pixelData, data);
	    inOffset += numDataElements;
	  }
      }
  }

  public float[] getPixel(int x, int y, float[] fArray, DataBuffer data)
  {
    if (fArray == null) fArray = new float[numBands];
    
    for (int b=0; b<numBands; b++)
      {
        fArray[b] = getSampleFloat(x, y, b, data);
      }
    return fArray;
  }

  public double[] getPixel(int x, int y, double[] dArray, DataBuffer data) {
    if (dArray == null) dArray = new double[numBands];
    for (int b=0; b<numBands; b++)
      {
	dArray[b] = getSampleDouble(x, y, b, data);
      }
    return dArray;
  }

  /* FIXME: Should it return a banded or pixel interleaved array of
     samples? (Assume interleaved.) */
  public int[] getPixels(int x, int y, int w, int h, int[] iArray,
			 DataBuffer data)
  {
    int size = w*h;
    int outOffset = 0;
    int[] pixel = null;
    if (iArray == null) iArray = new int[w*h*numBands];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    getPixel(xx, yy, pixel, data);
	    System.arraycopy(pixel, 0, iArray, outOffset, numBands);
	    outOffset += numBands;
	  }
      }
    return iArray;
  }

  /* FIXME: Should it return a banded or pixel interleaved array of
     samples? (Assume interleaved.) */
  public float[] getPixels(int x, int y, int w, int h, float[] fArray,
			   DataBuffer data)
  {
    int size = w*h;
    int outOffset = 0;
    float[] pixel = null;
    if (fArray == null) fArray = new float[w*h*numBands];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    getPixel(xx, yy, pixel, data);
	    System.arraycopy(pixel, 0, fArray, outOffset, numBands);
	    outOffset += numBands;
	  }
      }
    return fArray;
  }
    
  /* FIXME: Should it return a banded or pixel interleaved array of
     samples? (Assume interleaved.) */
  public double[] getPixels(int x, int y, int w, int h, double[] dArray,
			    DataBuffer data)
  {
    int size = w*h;
    int outOffset = 0;
    double[] pixel = null;
    if (dArray == null) dArray = new double[w*h*numBands];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    getPixel(xx, yy, pixel, data);
	    System.arraycopy(pixel, 0, dArray, outOffset, numBands);
	    outOffset += numBands;
	  }
      }
    return dArray;
  }

  public abstract int getSample(int x, int y, int b, DataBuffer data);

  public float getSampleFloat(int x, int y, int b, DataBuffer data)
  {
    return getSample(x, y, b, data);
  }

  public double getSampleDouble(int x, int y, int b, DataBuffer data)
  {
    return getSampleFloat(x, y, b, data);
  }

  public int[] getSamples(int x, int y, int w, int h, int b,
			  int[] iArray, DataBuffer data)
  {
    int size = w*h;
    int outOffset = 0;
    if (iArray == null) iArray = new int[size];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    iArray[outOffset++] = getSample(xx, yy, b, data);
	  }
      }
    return iArray;
  }

  public float[] getSamples(int x, int y, int w, int h, int b,
			    float[] fArray, DataBuffer data)
  {
    int size = w*h;
    int outOffset = 0;
    if (fArray == null) fArray = new float[size];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    fArray[outOffset++] = getSampleFloat(xx, yy, b, data);
	  }
      }
    return fArray;
  }

  public double[] getSamples(int x, int y, int w, int h, int b,
			     double[] dArray, DataBuffer data)
  {
    int size = w*h;
    int outOffset = 0;
    if (dArray == null) dArray = new double[size];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    dArray[outOffset++] = getSampleDouble(xx, yy, b, data);
	  }
      }
    return dArray;
  }
  
  public void setPixel(int x, int y, int[] iArray, DataBuffer data)
  {
    for (int b=0; b<numBands; b++) setSample(x, y, b, iArray[b], data);
  }

  public void setPixel(int x, int y, float[] fArray, DataBuffer data)
  {
    for (int b=0; b<numBands; b++) setSample(x, y, b, fArray[b], data);
  }

  public void setPixel(int x, int y, double[] dArray, DataBuffer data)
  {
    for (int b=0; b<numBands; b++) setSample(x, y, b, dArray[b], data);
  }

  public void setPixels(int x, int y, int w, int h, int[] iArray,
			DataBuffer data)
  {
    int inOffset = 0;
    int[] pixel = new int[numBands];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    System.arraycopy(iArray, inOffset, pixel, 0, numBands);
	    setPixel(xx, yy, pixel, data);
	    inOffset += numBands;
	  }
      }
  }

  public void setPixels(int x, int y, int w, int h, float[] fArray,
			DataBuffer data)
  {
    int inOffset = 0;
    float[] pixel = new float[numBands];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    System.arraycopy(fArray, inOffset, pixel, 0, numBands);
	    setPixel(xx, yy, pixel, data);
	    inOffset += numBands;
	  }
      }
  }

  public void setPixels(int x, int y, int w, int h, double[] dArray,
			DataBuffer data)
  {
    int inOffset = 0;
    double[] pixel = new double[numBands];
    for (int yy=y; yy<(y+h); yy++)
      {
	for (int xx=x; xx<(x+w); xx++)
	  {
	    System.arraycopy(dArray, inOffset, pixel, 0, numBands);
	    setPixel(xx, yy, pixel, data);
	    inOffset += numBands;
	  }
      }
  }

  public abstract void setSample(int x, int y, int b, int s,
				 DataBuffer data);

  public void setSample(int x, int y, int b, float s,
			DataBuffer data)
  {
    setSample(x, y, b, (int) s, data);
  }

  public void setSample(int x, int y, int b, double s,
			DataBuffer data)
  {
    setSample(x, y, b, (float) s, data);
  }

  public void setSamples(int x, int y, int w, int h, int b,
			 int[] iArray, DataBuffer data)
  {
    int size = w*h;
    int inOffset = 0;
    for (int yy=y; yy<(y+h); yy++)
      for (int xx=x; xx<(x+w); xx++)
	setSample(xx, yy, b, iArray[inOffset++], data);
  }

  public void setSamples(int x, int y, int w, int h, int b,
			 float[] fArray, DataBuffer data)
  {
    int size = w*h;
    int inOffset = 0;
    for (int yy=y; yy<(y+h); yy++)
      for (int xx=x; xx<(x+w); xx++)
	setSample(xx, yy, b, fArray[inOffset++], data);

    }

    public void setSamples(int x, int y, int w, int h, int b,
			   double[] dArray, DataBuffer data) {
      int size = w*h;
      int inOffset = 0;
      for (int yy=y; yy<(y+h); yy++)
	for (int xx=x; xx<(x+w); xx++)
	  setSample(xx, yy, b, dArray[inOffset++], data);
    }

    public abstract SampleModel createCompatibleSampleModel(int w, int h);

    public abstract SampleModel createSubsetSampleModel(int[] bands);

    public abstract DataBuffer createDataBuffer();

    public abstract int[] getSampleSize();

    public abstract int getSampleSize(int band);
}