| /* 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., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 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.RenderingHints; |
| import java.awt.geom.Point2D; |
| import java.awt.geom.Rectangle2D; |
| import java.util.Arrays; |
| |
| /** |
| * @author Jerry Quinn (jlquinn@optonline.net) |
| */ |
| public class RescaleOp implements BufferedImageOp, RasterOp |
| { |
| private float[] scale; |
| private float[] offsets; |
| private RenderingHints hints = null; |
| |
| public RescaleOp(float[] scaleFactors, |
| float[] offsets, |
| RenderingHints hints) |
| { |
| this.scale = scaleFactors; |
| this.offsets = offsets; |
| this.hints = hints; |
| } |
| |
| public RescaleOp(float scaleFactor, |
| float offset, |
| RenderingHints hints) |
| { |
| scale = new float[]{ scaleFactor }; |
| offsets = new float[]{offset}; |
| this.hints = hints; |
| } |
| |
| public final float[] getScaleFactors(float[] scaleFactors) |
| { |
| if (scaleFactors == null) |
| scaleFactors = new float[scale.length]; |
| System.arraycopy(scale, 0, scaleFactors, 0, scale.length); |
| return scaleFactors; |
| } |
| |
| public final float[] getOffsets(float[] offsets) |
| { |
| if (offsets == null) |
| offsets = new float[this.offsets.length]; |
| System.arraycopy(this.offsets, 0, offsets, 0, this.offsets.length); |
| return offsets; |
| } |
| |
| public final int getNumFactors() |
| { |
| return scale.length; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.BufferedImageOp#getRenderingHints() |
| */ |
| public RenderingHints getRenderingHints() |
| { |
| return 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) |
| { |
| // TODO Make sure premultiplied alpha is handled correctly. |
| // TODO See that color conversion is handled. |
| // TODO figure out how to use rendering hints. |
| if (scale.length != offsets.length) |
| throw new IllegalArgumentException(); |
| |
| ColorModel scm = src.getColorModel(); |
| if (dst == null) dst = createCompatibleDestImage(src, null); |
| |
| WritableRaster wsrc = src.getRaster(); |
| WritableRaster wdst = dst.getRaster(); |
| |
| // Share constant across colors except alpha |
| if (scale.length == 1 || scale.length == scm.getNumColorComponents()) |
| { |
| // Construct a raster that doesn't include an alpha band. |
| int[] subbands = new int[scm.getNumColorComponents()]; |
| for (int i=0; i < subbands.length; i++) subbands[i] = i; |
| wsrc = |
| wsrc.createWritableChild(wsrc.minX, wsrc.minY, wsrc.width, wsrc.height, |
| wsrc.minX, wsrc.minY, subbands); |
| } |
| // else all color bands |
| |
| filter(wsrc, wdst); |
| return dst; |
| } |
| |
| /* (non-Javadoc) |
| * @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) dest = src.createCompatibleWritableRaster(); |
| |
| // Required sanity checks |
| if (src.numBands != dest.numBands || scale.length != offsets.length) |
| throw new IllegalArgumentException(); |
| if (scale.length != 1 && scale.length != src.numBands) |
| throw new IllegalArgumentException(); |
| |
| // Create scaling arrays if needed |
| float[] lscale = scale; |
| float[] loff = offsets; |
| if (scale.length == 1) |
| { |
| lscale = new float[src.numBands]; |
| Arrays.fill(lscale, scale[0]); |
| loff = new float[src.numBands]; |
| Arrays.fill(loff, offsets[0]); |
| } |
| |
| // TODO The efficiency here can be improved for various data storage |
| // patterns, aka SampleModels. |
| float[] pixel = new float[src.numBands]; |
| for (int y = src.minY; y < src.height + src.minY; y++) |
| for (int x = src.minX; x < src.width + src.minX; x++) |
| { |
| src.getPixel(x, y, pixel); |
| for (int b = 0; b < src.numBands; b++) |
| pixel[b] = pixel[b] * lscale[b] + loff[b]; |
| dest.setPixel(x, y, pixel); |
| } |
| return dest; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.BufferedImageOp#createCompatibleDestImage(java.awt.image.BufferedImage, java.awt.image.ColorModel) |
| */ |
| public BufferedImage createCompatibleDestImage(BufferedImage src, |
| ColorModel dstCM) |
| { |
| if (dstCM == null) dstCM = src.getColorModel(); |
| WritableRaster wr = src.getRaster().createCompatibleWritableRaster(); |
| BufferedImage image |
| = new BufferedImage(dstCM, wr, src.isPremultiplied, null); |
| return image; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster) |
| */ |
| public WritableRaster createCompatibleDestRaster(Raster src) |
| { |
| return src.createCompatibleWritableRaster(); |
| } |
| |
| /* (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.RasterOp#getBounds2D(java.awt.image.Raster) |
| */ |
| public final Rectangle2D getBounds2D(Raster src) |
| { |
| return src.getBounds(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.awt.image.BufferedImageOp#getPoint2D(java.awt.geom.Point2D, java.awt.geom.Point2D) |
| */ |
| public final Point2D getPoint2D(Point2D src, Point2D dst) { |
| if (dst == null) dst = (Point2D) src.clone(); |
| else dst.setLocation(src); |
| return dst; |
| } |
| |
| } |