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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/BandCombineOp.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/image/BandCombineOp.java')
-rw-r--r-- | libjava/classpath/java/awt/image/BandCombineOp.java | 218 |
1 files changed, 218 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 000000000..f3a6c5756 --- /dev/null +++ b/libjava/classpath/java/awt/image/BandCombineOp.java @@ -0,0 +1,218 @@ +/* BandCombineOp.java - perform a combination on the bands of a raster + Copyright (C) 2004, 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 +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.RenderingHints; +import java.awt.geom.Point2D; +import java.awt.geom.Rectangle2D; +import java.util.Arrays; + +/** + * 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. + * + * This Op assumes that samples are integers; floating point sample types will + * be rounded to their nearest integer value during filtering. + * + * @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. + * @throws ArrayIndexOutOfBoundsException if the matrix is invalid + */ + public BandCombineOp(float[][] matrix, RenderingHints hints) + { + this.matrix = new float[matrix.length][]; + int width = matrix[0].length; + for (int i = 0; i < matrix.length; i++) + { + this.matrix[i] = new float[width + 1]; + for (int j = 0; j < width; j++) + this.matrix[i][j] = matrix[i][j]; + + // The reference implementation pads the array with a trailing zero... + this.matrix[i][width] = 0; + } + + 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. + * @throws IllegalArgumentException if the destination raster is incompatible + * with the source raster. + * @return The filtered 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); + else if (dest.getNumBands() != src.getNumBands() + || dest.getTransferType() != src.getTransferType()) + throw new IllegalArgumentException("Destination raster is incompatible with source raster"); + + // Filter the pixels + int[] spix = new int[matrix[0].length - 1]; + int[] spix2 = new int[matrix[0].length - 1]; + int[] dpix = new int[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; + src.getPixel(x, y, spix); + + // Do not re-calculate if pixel is identical to the last one + // (ie, blocks of the same colour) + if (!Arrays.equals(spix, spix2)) + { + System.arraycopy(spix, 0, spix2, 0, spix.length); + for (int i = 0; i < matrix.length; i++) + { + dpix[i] = 0; + for (int j = 0; j < matrix[0].length - 1; j++) + dpix[i] += spix[j] * (int)matrix[i][j]; + } + } + dest.setPixel(x, y, dpix); + } + + return dest; + } + + /* (non-Javadoc) + * @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster) + */ + public final Rectangle2D getBounds2D(Raster src) + { + return src.getBounds(); + } + + /** + * Creates a new WritableRaster that can be used as the destination for this + * Op. The number of bands in the source raster must equal the number of rows + * in the op matrix, which must also be equal to either the number of columns + * or (columns - 1) in the matrix. + * + * @param src The source raster. + * @return A compatible raster. + * @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster) + * @throws IllegalArgumentException if the raster is incompatible with the + * matrix. + */ + public WritableRaster createCompatibleDestRaster(Raster src) + { + // Destination raster must have same number of bands as source + if (src.getNumBands() != matrix.length) + throw new IllegalArgumentException("Number of rows in matrix specifies an " + + "incompatible number of bands"); + + // We use -1 and -2 because we previously padded the rows with a trailing 0 + if (src.getNumBands() != matrix[0].length - 1 + && src.getNumBands() != matrix[0].length - 2) + throw new IllegalArgumentException("Incompatible number of bands: " + + "the number of bands in the raster must equal the number of " + + "columns in the matrix, optionally minus one"); + + return src.createCompatibleWritableRaster(); + } + + /** + * Return corresponding destination point for source point. Because this is + * not a geometric operation, it simply returns a copy of the source. + * + * @param src The source point. + * @param dst The destination point. + * @return 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; + } + + /* (non-Javadoc) + * @see java.awt.image.RasterOp#getRenderingHints() + */ + public final RenderingHints getRenderingHints() + { + return hints; + } + + /** + * Return the matrix used in this operation. + * + * @return The matrix used in this operation. + */ + public final float[][] getMatrix() + { + return matrix; + } + +} |