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Diffstat (limited to 'libjava/classpath/java/awt/image/BandCombineOp.java')
| -rw-r--r-- | libjava/classpath/java/awt/image/BandCombineOp.java | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/image/BandCombineOp.java b/libjava/classpath/java/awt/image/BandCombineOp.java new file mode 100644 index 00000000000..79efb02e713 --- /dev/null +++ b/libjava/classpath/java/awt/image/BandCombineOp.java @@ -0,0 +1,168 @@ +/* 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.Point; +import java.awt.RenderingHints; +import java.awt.geom.Point2D; +import java.awt.geom.Rectangle2D; + +/** + * Filter Raster pixels by applying a matrix. + * + * BandCombineOp applies a matrix to each pixel to produce new pixel values. + * The width of the matrix must be the same or one more than the number of + * bands in the source Raster. If one more, the pixels in the source are + * assumed to contain an implicit 1.0 at the end. + * + * The rows of the matrix are multiplied by the pixel to produce the values + * for the destination. Therefore the destination Raster must contain the + * same number of bands as the number of rows in the filter matrix. + * + * @author Jerry Quinn (jlquinn@optonline.net) + */ +public class BandCombineOp implements RasterOp +{ + private RenderingHints hints; + private float[][] matrix; + + /** + * Construct a BandCombineOp. + * + * @param matrix The matrix to filter pixels with. + * @param hints Rendering hints to apply. Ignored. + */ + public BandCombineOp(float[][] matrix, RenderingHints hints) + { + this.matrix = matrix; + this.hints = hints; + } + + /** + * Filter Raster pixels through a matrix. + * + * Applies the Op matrix to source pixes to produce dest pixels. Each row + * of the matrix is multiplied by the src pixel components to produce the + * dest pixel. If matrix is one more than the number of bands in the src, + * the last element is implicitly multiplied by 1, i.e. added to the sum + * for that dest component. + * + * If dest is null, a suitable Raster is created. This implementation uses + * createCompatibleDestRaster. + * + * @param src The source Raster. + * @param dest The destination Raster, or null. + * @returns The destination Raster or an allocated Raster. + * @see java.awt.image.RasterOp#filter(java.awt.image.Raster, + *java.awt.image.WritableRaster) + */ + public WritableRaster filter(Raster src, WritableRaster dest) { + if (dest == null) + dest = createCompatibleDestRaster(src); + + // Filter the pixels + float[] spix = new float[matrix[0].length]; + float[] dpix = new float[matrix.length]; + for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++) + for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++) + { + // In case matrix rows have implicit translation + spix[spix.length - 1] = 1.0f; + src.getPixel(x, y, spix); + for (int i = 0; i < matrix.length; i++) + { + dpix[i] = 0; + for (int j = 0; j < matrix[0].length; j++) + dpix[i] += spix[j] * matrix[i][j]; + } + dest.setPixel(x, y, dpix); + } + + return dest; + } + + /* (non-Javadoc) + * @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster) + */ + public Rectangle2D getBounds2D(Raster src) + { + return src.getBounds(); + } + + /** + * Creates a new WritableRaster that can be used as the destination for this + * Op. This implementation creates a Banded Raster with data type FLOAT. + * @see + *java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster) + */ + public WritableRaster createCompatibleDestRaster(Raster src) + { + return Raster.createBandedRaster(DataBuffer.TYPE_FLOAT, src.getWidth(), + src.getHeight(), matrix.length, + new Point(src.getMinX(), src.getMinY())); + } + + /** 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 Point2D getPoint2D(Point2D src, Point2D dst) + { + if (dst == null) return (Point2D)src.clone(); + dst.setLocation(src); + return dst; + } + + /* (non-Javadoc) + * @see java.awt.image.RasterOp#getRenderingHints() + */ + public RenderingHints getRenderingHints() + { + return hints; + } + + /** Return the matrix for this Op. */ + public float[][] getMatrix() + { + return matrix; + } + +} |