singlepixelpackedsamplemodel.java

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/* Copyright (C) 2000, 2002, 2003, 2004  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
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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.

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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
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
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package java.awt.image;

import gnu.java.awt.BitMaskExtent;
import gnu.java.awt.Buffers;

/**
 * @author Rolf W. Rasmussen ([e-mail])
 */
public class SinglePixelPackedSampleModel extends SampleModel
{
  private int scanlineStride;
  private int[] bitMasks;
  private int[] bitOffsets;
  private int[] sampleSize;
  
  public SinglePixelPackedSampleModel(int dataType, int w, int h,
				      int[] bitMasks)
  {
    this(dataType, w, h, w, bitMasks);
  }

  public SinglePixelPackedSampleModel(int dataType, int w, int h,
				      int scanlineStride, int[] bitMasks)
  {
    super(dataType, w, h, bitMasks.length);

    switch (dataType)
      {
      case DataBuffer.TYPE_BYTE:
      case DataBuffer.TYPE_USHORT:
      case DataBuffer.TYPE_INT:
	break;
      default:
	throw new IllegalArgumentException("SinglePixelPackedSampleModel unsupported dataType");
      }
    
    this.scanlineStride = scanlineStride;
    this.bitMasks = bitMasks;
    
    bitOffsets = new int[numBands];
    sampleSize = new int[numBands];
    
    BitMaskExtent extent = new BitMaskExtent();
    for (int b=0; b<numBands; b++)
      {
	extent.setMask(bitMasks[b]);
	sampleSize[b] = extent.bitWidth;
	bitOffsets[b] = extent.leastSignificantBit;
      }
  }

  public int getNumDataElements()
  {
    return 1;
  }

  public SampleModel createCompatibleSampleModel(int w, int h)
  {
    /* FIXME: We can avoid recalculation of bit offsets and sample
       sizes here by passing these from the current instance to a
       special private constructor. */
    return new SinglePixelPackedSampleModel(dataType, w, h, bitMasks);
  }


  /**
   * Creates a DataBuffer for holding pixel data in the format and
   * layout described by this SampleModel. The returned buffer will
   * consist of one single bank.
   */
  public DataBuffer createDataBuffer()
  {
    int size;

    // We can save (scanlineStride - width) pixels at the very end of
    // the buffer. The Sun reference implementation (J2SE 1.3.1 and
    // 1.4.1_01) seems to do this; tested with Mauve test code.
    size = scanlineStride * (height - 1) + width;

    return Buffers.createBuffer(getDataType(), size);
  }


  public int[] getSampleSize()
  {
    return sampleSize;
  }
  
  public int getSampleSize(int band)
  {
    return sampleSize[band];
  }

  public int getOffset(int x, int y)
  {
    return scanlineStride*y + x;
  }

  public int[] getBitOffsets()
  {
    return bitOffsets;
  }

  public int[] getBitMasks()
  {
    return bitMasks;
  }

  public int getScanlineStride()
  {
    return scanlineStride;
  }

  public SampleModel createSubsetSampleModel(int[] bands)
  {
    // FIXME: Is this the right way to interpret bands?
    
    int numBands = bands.length;
    
    int[] bitMasks = new int[numBands];

    for (int b=0; b<numBands; b++)
      bitMasks[b] = this.bitMasks[bands[b]];

    return new SinglePixelPackedSampleModel(dataType, width, height,
					    scanlineStride, bitMasks);
  }

  public Object getDataElements(int x, int y, Object obj,
				DataBuffer data)
  {
    int offset = scanlineStride*y + x + data.getOffset();
    
    return Buffers.getData(data, offset, obj,
			   0, // destination offset,
			   1  // length
			   );
  }
  
  /**
   * This is a more efficient implementation of the default implementation in the super
   * class. 
   * @param x The x-coordinate of the pixel rectangle to store in <code>obj</code>.
   * @param y The y-coordinate of the pixel rectangle to store in <code>obj</code>.
   * @param w The width of the pixel rectangle to store in <code>obj</code>.
   * @param h The height of the pixel rectangle to store in <code>obj</code>.
   * @param obj The primitive array to store the pixels into or null to force creation.
   * @param data The DataBuffer that is the source of the pixel data.
   * @return The primitive array containing the pixel data.
   * @see java.awt.image.SampleModel#getDataElements(int, int, int, int, java.lang.Object, java.awt.image.DataBuffer)
   */
  public Object getDataElements(int x, int y, int w, int h, Object obj,
							DataBuffer data)
  {
    int size = w*h;
    int dataSize = size;
    Object pixelData = null;
    switch (getTransferType())
    {
      case DataBuffer.TYPE_BYTE:
        pixelData = ((DataBufferByte) data).getData();
        if (obj == null) obj = new byte[dataSize];
        break;
       case DataBuffer.TYPE_USHORT:
         pixelData = ((DataBufferUShort) data).getData();
         if (obj == null) obj = new short[dataSize];
         break;
        case DataBuffer.TYPE_INT:
          pixelData = ((DataBufferInt) data).getData();
          if (obj == null) obj = new int[dataSize];
          break;
         default:
             // Seems like the only sensible thing to do.
           throw new ClassCastException();
      }
      if(x==0 && scanlineStride == w)
      { 
        // The full width need to be copied therefore we can copy in one shot.
        System.arraycopy(pixelData, scanlineStride*y + data.getOffset(), obj, 0, size);
      }
      else
      {  
        // Since we do not need the full width we need to copy line by line.
        int outOffset = 0;
        int dataOffset = scanlineStride*y + x + data.getOffset();
        for (int yy = y; yy<(y+h); yy++)
        {
          System.arraycopy(pixelData, dataOffset, obj, outOffset, w);
          dataOffset += scanlineStride;
          outOffset += w;
        }
      }
    return obj;
  }
  

  public int[] getPixel(int x, int y, int[] iArray, DataBuffer data)
  {
    int offset = scanlineStride*y + x;
    if (iArray == null) iArray = new int[numBands];
    int samples = data.getElem(offset);

    for (int b=0; b<numBands; b++)
      iArray[b] = (samples & bitMasks[b]) >>> bitOffsets[b];
	
    return iArray;
  }

  public int[] getPixels(int x, int y, int w, int h, int[] iArray,
			 DataBuffer data)
  {
    int offset = scanlineStride*y + x;
    if (iArray == null) iArray = new int[numBands*w*h];
    int outOffset = 0;
    for (y=0; y<h; y++)
      {
	int lineOffset = offset;
	for (x=0; x<w; x++)
	  {
	    int samples = data.getElem(lineOffset++);
	    for (int b=0; b<numBands; b++)
	      iArray[outOffset++] = (samples & bitMasks[b]) >>> bitOffsets[b];
	  }
	offset += scanlineStride;
      }
    return iArray;	
  }

  public int getSample(int x, int y, int b, DataBuffer data)
  {
    int offset = scanlineStride*y + x;
    int samples = data.getElem(offset);
    return (samples & bitMasks[b]) >>> bitOffsets[b];
  }
  
  /**
   * This method implements a more efficient way to set data elements than the default
   * implementation of the super class. It sets the data elements line by line instead 
   * of pixel by pixel.
   * @param x The x-coordinate of the data elements in <code>obj</code>.
   * @param y The y-coordinate of the data elements in <code>obj</code>.
   * @param w The width of the data elements in <code>obj</code>.
   * @param h The height of the data elements in <code>obj</code>.
   * @param obj The primitive array containing the data elements to set.
   * @param data The DataBuffer to store the data elements into.
   * @see java.awt.image.SampleModel#setDataElements(int, int, int, int, java.lang.Object, java.awt.image.DataBuffer)
   */
  public void setDataElements(int x, int y, int w, int h,
				Object obj, DataBuffer data)
  {
    
    Object pixelData;
    switch (getTransferType())
    {
      case DataBuffer.TYPE_BYTE:
        pixelData = ((DataBufferByte) data).getData();
        break;
       case DataBuffer.TYPE_USHORT:
         pixelData = ((DataBufferUShort) data).getData();
         break;
       case DataBuffer.TYPE_INT:
         pixelData = ((DataBufferInt) data).getData();
         break;
       default:
          // Seems like the only sensible thing to do.
          throw new ClassCastException();
    }
    
    int inOffset = 0;
    int dataOffset = scanlineStride*y + x + data.getOffset();
    for (int yy=y; yy<(y+h); yy++)
    {
      System.arraycopy(obj,inOffset,pixelData,dataOffset,w);
      dataOffset += scanlineStride;
      inOffset += w;
    }
  }
  
  
  public void setDataElements(int x, int y, Object obj, DataBuffer data)
  {
    int offset = scanlineStride*y + x + data.getOffset();
    
    int transferType = getTransferType();
    if (getTransferType() != data.getDataType())
      {
	throw new IllegalArgumentException("transfer type ("+
					   getTransferType()+"), "+
					   "does not match data "+
					   "buffer type (" +
					   data.getDataType() +
					   ").");
      }

    try
      {
	switch (transferType)
	  {
	  case DataBuffer.TYPE_BYTE:
	    {
	      DataBufferByte out = (DataBufferByte) data;
	      byte[] in = (byte[]) obj;
	      out.getData()[offset] = in[0];
	      return;
	    }
	  case DataBuffer.TYPE_USHORT:
	    {
	      DataBufferUShort out = (DataBufferUShort) data;
	      short[] in = (short[]) obj;
	      out.getData()[offset] = in[0];
	      return;
	    }
	  case DataBuffer.TYPE_INT:
	    {
	      DataBufferInt out = (DataBufferInt) data;
	      int[] in = (int[]) obj;
	      out.getData()[offset] = in[0];
	      return;
	    }
	    // FIXME: Fill in the other possible types.
	  default:
	    throw new InternalError();
	  }
      }
    catch (ArrayIndexOutOfBoundsException aioobe)
      {
	String msg = "While writing data elements" +
	  ", x="+x+", y="+y+
	  ", width="+width+", height="+height+
	  ", scanlineStride="+scanlineStride+
	  ", offset="+offset+
	  ", data.getSize()="+data.getSize()+
	  ", data.getOffset()="+data.getOffset()+
	  ": " +
	  aioobe;
	throw new ArrayIndexOutOfBoundsException(msg);
      }
    }

  public void setPixel(int x, int y, int[] iArray, DataBuffer data)
  {
    int offset = scanlineStride*y + x;
    
    int samples = 0;
    for (int b=0; b<numBands; b++)
      samples |= (iArray[b] << bitOffsets[b]) & bitMasks[b];

    data.setElem(offset, samples);
  }

  /**
   * This method implements a more efficient way to set pixels than the default
   * implementation of the super class. It copies the pixel components directly
   * from the input array instead of creating a intermediate buffer.
   * @param x The x-coordinate of the pixel rectangle in <code>obj</code>.
   * @param y The y-coordinate of the pixel rectangle in <code>obj</code>.
   * @param w The width of the pixel rectangle in <code>obj</code>.
   * @param h The height of the pixel rectangle in <code>obj</code>.
   * @param iArray The primitive array containing the pixels to set.
   * @param data The DataBuffer to store the pixels into.
   * @see java.awt.image.SampleModel#setPixels(int, int, int, int, int[], java.awt.image.DataBuffer)
   */
  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++)
     {
      int offset = scanlineStride*yy + x;
      for (int xx=x; xx<(x+w); xx++)
       { 
        int samples = 0;
        for (int b=0; b<numBands; b++)
          samples |= (iArray[inOffset+b] << bitOffsets[b]) & bitMasks[b];
        data.setElem(0, offset, samples);
        inOffset += numBands;
        offset += 1;
      }
    }
  }
  
  
  public void setSample(int x, int y, int b, int s, DataBuffer data)
  {
    int offset = scanlineStride*y + x;
    int samples = data.getElem(offset);
    int bitMask = bitMasks[b];
    samples &= ~bitMask;
    samples |= (s << bitOffsets[b]) & bitMask;
    data.setElem(offset, samples);
  }
  
  /**
   * Creates a String with some information about this SampleModel.
   * @return A String describing this SampleModel.
   * @see java.lang.Object#toString()
   */
  public String toString()
  {
    StringBuffer result = new StringBuffer();
    result.append(getClass().getName());
    result.append("[");
    result.append("scanlineStride=").append(scanlineStride);
    for(int i=0; i < bitMasks.length; i+=1)
    {
      result.append(", mask[").append(i).append("]=0x").append(Integer.toHexString(bitMasks[i]));
    }
    
    result.append("]");
    return result.toString();
  }
}