Retro68/gcc/libjava/classpath/java/awt/image/RasterOp.java

/* RasterOp.java --
   Copyright (C) 2000, 2002, 2004, 2005, 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
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02110-1301 USA.

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permission to link this library with independent modules to produce an
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package java.awt.image;

import java.awt.RenderingHints;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

/**
 * An operation that is performed on one raster (the source) producing a new
 * raster (the destination).
 */
public interface RasterOp
{
  /**
   * Performs an operation on the source raster, returning the result in a
   * writable raster.  If <code>dest</code> is <code>null</code>, a new
   * <code>WritableRaster</code> will be created by calling the
   * {@link #createCompatibleDestRaster(Raster)} method.  If <code>dest</code>
   * is not <code>null</code>, the result is written to <code>dest</code> then
   * returned (this avoids creating a new <code>WritableRaster</code> each
   * time this method is called).
   *
   * @param src  the source raster.
   * @param dest  the destination raster (<code>null</code> permitted).
   *
   * @return The filtered raster.
   */
  WritableRaster filter(Raster src, WritableRaster dest);

  /**
   * Returns the bounds of the destination raster on the basis of this
   * <code>RasterOp</code> being applied to the specified source raster.
   *
   * @param src  the source raster.
   *
   * @return The destination bounds.
   */
  Rectangle2D getBounds2D(Raster src);

  /**
   * Returns a raster that can be used by this <code>RasterOp</code> as the
   * destination raster when operating on the specified source raster.
   *
   * @param src  the source raster.
   *
   * @return A new writable raster that can be used as the destination raster.
   */
  WritableRaster createCompatibleDestRaster(Raster src);

  /**
   * Returns the point on the destination raster that corresponds to the given
   * point on the source raster.
   *
   * @param srcPoint  the source point.
   * @param destPoint  the destination point (<code>null</code> permitted).
   *
   * @return The destination point.
   */
  Point2D getPoint2D(Point2D srcPoint, Point2D destPoint);

  /**
   * Returns the rendering hints for this operation.
   *
   * @return The rendering hints.
   */
  RenderingHints getRenderingHints();
}