| /* LookupOp.java -- Filter that converts each pixel using a lookup table. |
| Copyright (C) 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 java.awt.image; |
| |
| import java.awt.Graphics2D; |
| import java.awt.RenderingHints; |
| import java.awt.geom.Point2D; |
| import java.awt.geom.Rectangle2D; |
| |
| /** |
| * LookupOp is a filter that converts each pixel using a lookup table. |
| * |
| * For filtering Rasters, the lookup table must have either one component |
| * that is applied to all bands, or one component for every band in the |
| * Rasters. |
| * |
| * For BufferedImages, the lookup table may apply to both color and alpha |
| * components. If the lookup table contains one component, or if there are |
| * the same number of components as color components in the source, the table |
| * applies to all color components. Otherwise the table applies to all |
| * components including alpha. Alpha premultiplication is ignored during the |
| * lookup filtering. |
| * |
| * After filtering, if color conversion is necessary, the conversion happens, |
| * taking alpha premultiplication into account. |
| * |
| * @author jlquinn |
| */ |
| public class LookupOp implements BufferedImageOp, RasterOp |
| { |
| private LookupTable lut; |
| private RenderingHints hints; |
| |
| /** Construct a new LookupOp. |
| * |
| * @param lookup LookupTable to use. |
| * @param hints Rendering hints (can be null). |
| */ |
| public LookupOp(LookupTable lookup, RenderingHints hints) |
| { |
| lut = lookup; |
| this.hints = hints; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage) |
| */ |
| public final BufferedImage filter(BufferedImage src, BufferedImage dst) |
| { |
| if (src.getColorModel() instanceof IndexColorModel) |
| throw new IllegalArgumentException("LookupOp.filter: IndexColorModel " |
| + "not allowed"); |
| if (dst == null) |
| dst = createCompatibleDestImage(src, src.getColorModel()); |
| |
| // Set up for potential colormodel mismatch |
| BufferedImage tgt; |
| if (dst.getColorModel().equals(src.getColorModel())) |
| tgt = dst; |
| else |
| tgt = createCompatibleDestImage(src, src.getColorModel()); |
| |
| Raster sr = src.getRaster(); |
| WritableRaster dr = tgt.getRaster(); |
| |
| if (src.getColorModel().hasAlpha() && |
| (lut.getNumComponents() == 1 || |
| lut.getNumComponents() == src.getColorModel().getNumColorComponents())) |
| { |
| // Need to ignore alpha for lookup |
| int[] dbuf = new int[src.getColorModel().getNumComponents()]; |
| int tmpBands = src.getColorModel().getNumColorComponents(); |
| int[] tmp = new int[tmpBands]; |
| |
| // Filter the pixels |
| for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++) |
| for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++) |
| { |
| // Filter only color components, but also copy alpha |
| sr.getPixel(x, y, dbuf); |
| System.arraycopy(dbuf, 0, tmp, 0, tmpBands); |
| dr.setPixel(x, y, lut.lookupPixel(tmp, dbuf)); |
| } |
| } |
| else if (lut.getNumComponents() != 1 |
| && |
| lut.getNumComponents() != src.getColorModel().getNumComponents()) |
| throw new IllegalArgumentException("LookupOp.filter: " |
| + "Incompatible lookup " |
| + "table and source image"); |
| |
| // No alpha to ignore |
| int[] dbuf = new int[src.getColorModel().getNumComponents()]; |
| |
| // Filter the pixels |
| for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++) |
| for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++) |
| dr.setPixel(x, y, lut.lookupPixel(sr.getPixel(x, y, dbuf), dbuf)); |
| |
| if (tgt != dst) |
| { |
| // Convert between color models. |
| // TODO Check that premultiplied alpha is handled correctly here. |
| Graphics2D gg = dst.createGraphics(); |
| gg.setRenderingHints(hints); |
| gg.drawImage(tgt, 0, 0, null); |
| gg.dispose(); |
| } |
| |
| return dst; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.BufferedImageOp#getBounds2D(java.awt.image.BufferedImage) |
| */ |
| public final Rectangle2D getBounds2D(BufferedImage src) |
| { |
| return src.getRaster().getBounds(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.BufferedImageOp#createCompatibleDestImage(java.awt.image.BufferedImage, java.awt.image.ColorModel) |
| */ |
| public BufferedImage createCompatibleDestImage(BufferedImage src, |
| ColorModel dstCM) |
| { |
| // FIXME: set properties to those in src |
| return new BufferedImage(dstCM, |
| src.getRaster().createCompatibleWritableRaster(), |
| src.isPremultiplied, null); |
| } |
| |
| /** Return corresponding destination point for source point. |
| * |
| * LookupOp will return the value of src unchanged. |
| * @param src The source point. |
| * @param dst The destination point. |
| * @see java.awt.image.RasterOp#getPoint2D(java.awt.geom.Point2D, java.awt.geom.Point2D) |
| */ |
| public final Point2D getPoint2D(Point2D src, Point2D dst) |
| { |
| if (dst == null) |
| return (Point2D) src.clone(); |
| |
| dst.setLocation(src); |
| return dst; |
| } |
| |
| /** Return the LookupTable for this op. */ |
| public final LookupTable getTable() |
| { |
| return lut; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.RasterOp#getRenderingHints() |
| */ |
| public final RenderingHints getRenderingHints() |
| { |
| return hints; |
| } |
| |
| /** Filter a raster through a lookup table. |
| * |
| * Applies the lookup table for this Rasterop to each pixel of src and |
| * puts the results in dest. If dest is null, a new Raster is created and |
| * returned. |
| * |
| * @param src The source raster. |
| * @param dest The destination raster. |
| * @return The WritableRaster with the filtered pixels. |
| * @throws IllegalArgumentException if lookup table has more than one |
| * component but not the same as src and dest. |
| * @see java.awt.image.RasterOp#filter(java.awt.image.Raster, java.awt.image.WritableRaster) |
| */ |
| public final WritableRaster filter(Raster src, WritableRaster dest) |
| { |
| if (dest == null) |
| // Allocate a raster if needed |
| dest = createCompatibleDestRaster(src); |
| else |
| if (src.getNumBands() != dest.getNumBands()) |
| throw new IllegalArgumentException(); |
| |
| if (lut.getNumComponents() != 1 |
| && lut.getNumComponents() != src.getNumBands()) |
| throw new IllegalArgumentException(); |
| |
| |
| // Allocate pixel storage. |
| int[] tmp = new int[src.getNumBands()]; |
| |
| // Filter the pixels |
| for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++) |
| for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++) |
| dest.setPixel(x, y, lut.lookupPixel(src.getPixel(x, y, tmp), tmp)); |
| return dest; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster) |
| */ |
| public final Rectangle2D getBounds2D(Raster src) |
| { |
| return src.getBounds(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster) |
| */ |
| public WritableRaster createCompatibleDestRaster(Raster src) |
| { |
| return src.createCompatibleWritableRaster(); |
| } |
| |
| } |