001/* RasterOp.java -- 002 Copyright (C) 2000, 2002, 2004, 2005, 2006, Free Software Foundation 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package java.awt.image; 040 041import java.awt.RenderingHints; 042import java.awt.geom.Point2D; 043import java.awt.geom.Rectangle2D; 044 045/** 046 * An operation that is performed on one raster (the source) producing a new 047 * raster (the destination). 048 */ 049public interface RasterOp 050{ 051 /** 052 * Performs an operation on the source raster, returning the result in a 053 * writable raster. If <code>dest</code> is <code>null</code>, a new 054 * <code>WritableRaster</code> will be created by calling the 055 * {@link #createCompatibleDestRaster(Raster)} method. If <code>dest</code> 056 * is not <code>null</code>, the result is written to <code>dest</code> then 057 * returned (this avoids creating a new <code>WritableRaster</code> each 058 * time this method is called). 059 * 060 * @param src the source raster. 061 * @param dest the destination raster (<code>null</code> permitted). 062 * 063 * @return The filtered raster. 064 */ 065 WritableRaster filter(Raster src, WritableRaster dest); 066 067 /** 068 * Returns the bounds of the destination raster on the basis of this 069 * <code>RasterOp</code> being applied to the specified source raster. 070 * 071 * @param src the source raster. 072 * 073 * @return The destination bounds. 074 */ 075 Rectangle2D getBounds2D(Raster src); 076 077 /** 078 * Returns a raster that can be used by this <code>RasterOp</code> as the 079 * destination raster when operating on the specified source raster. 080 * 081 * @param src the source raster. 082 * 083 * @return A new writable raster that can be used as the destination raster. 084 */ 085 WritableRaster createCompatibleDestRaster(Raster src); 086 087 /** 088 * Returns the point on the destination raster that corresponds to the given 089 * point on the source raster. 090 * 091 * @param srcPoint the source point. 092 * @param destPoint the destination point (<code>null</code> permitted). 093 * 094 * @return The destination point. 095 */ 096 Point2D getPoint2D(Point2D srcPoint, Point2D destPoint); 097 098 /** 099 * Returns the rendering hints for this operation. 100 * 101 * @return The rendering hints. 102 */ 103 RenderingHints getRenderingHints(); 104} 105