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/* Copyright (C) 2000, 2002, 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

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;

import java.awt.RenderingHints;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import java.awt.image.ComponentSampleModel;

import java.awt.image.DataBuffer;

import java.awt.image.Raster;

import java.awt.image.RasterOp;

import java.awt.image.WritableRaster;

/**

 * This raster copy operation assumes that both source and destination

 * sample models are tightly pixel packed and contain the same number

 * of bands.

 *

 * @throws java.lang.ClassCastException if the sample models of the

 * rasters are not of type ComponentSampleModel.

 *

 * @author Rolf W. Rasmussen (rolfwr@ii.uib.no)

 */

public class ComponentDataBlitOp implements RasterOp

{

  public static final ComponentDataBlitOp INSTANCE = new ComponentDataBlitOp();

  public WritableRaster filter(Raster src, WritableRaster dest)

  {

    if (dest == null)

      dest = createCompatibleDestRaster(src);

    DataBuffer  srcDB =  src.getDataBuffer();

    DataBuffer destDB = dest.getDataBuffer();

    ComponentSampleModel  srcSM = (ComponentSampleModel)  src.getSampleModel();

    ComponentSampleModel destSM = (ComponentSampleModel) dest.getSampleModel();

    // Calculate offset to data in the underlying arrays:

    int  srcScanlineStride =  srcSM.getScanlineStride();

    int destScanlineStride = destSM.getScanlineStride();

    int srcX  =  src.getMinX() -  src.getSampleModelTranslateX();

    int srcY  =  src.getMinY() -  src.getSampleModelTranslateY();

    int destX = dest.getMinX() - dest.getSampleModelTranslateX();

    int destY = dest.getMinY() - dest.getSampleModelTranslateY();

    int numBands = srcSM.getNumBands();

    /* We can't use getOffset(x, y) from the sample model since we

       don't want the band offset added in. */

    int srcOffset =

      numBands*srcX + srcScanlineStride*srcY +    // from sample model

      srcDB.getOffset();                          // from data buffer

    int destOffset =

      numBands*destX + destScanlineStride*destY + // from sample model

      destDB.getOffset();                         // from data buffer

    // Determine how much, and how many times to blit.

    int rowSize = src.getWidth()*numBands;

    int h = src.getHeight();

    if ((rowSize == srcScanlineStride) &&

        (rowSize == destScanlineStride))

      {

        // collapse scan line blits to one large blit.

        rowSize *= h;

        h = 1;

      }

    // Do blitting

    Object srcArray  = Buffers.getData(srcDB);

    Object destArray = Buffers.getData(destDB);

    for (int yd = 0; yd<h; yd++)

      {

        System.arraycopy(srcArray, srcOffset,

                         destArray, destOffset,

                         rowSize);

        srcOffset  +=  srcScanlineStride;

        destOffset += destScanlineStride;

      }

    return dest;

  }

  public Rectangle2D getBounds2D(Raster src)

  {

    return src.getBounds();

  }

  public WritableRaster createCompatibleDestRaster(Raster src) {

    /* FIXME: Maybe we should explicitly create a raster with a

       tightly pixel packed sample model, rather than assuming

       that the createCompatibleWritableRaster() method in Raster

       will create one. */

    return src.createCompatibleWritableRaster();

  }

  public Point2D getPoint2D(Point2D srcPoint, Point2D destPoint)

  {

    if (destPoint == null)

      return (Point2D) srcPoint.clone();

    destPoint.setLocation(srcPoint);

    return destPoint;

  }

  public RenderingHints getRenderingHints()

  {

    throw new UnsupportedOperationException("not implemented");

  }

}