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Diffstat (limited to 'libjava/classpath/java/awt/image/ConvolveOp.java')
| -rw-r--r-- | libjava/classpath/java/awt/image/ConvolveOp.java | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/image/ConvolveOp.java b/libjava/classpath/java/awt/image/ConvolveOp.java new file mode 100644 index 0000000..f841c13 --- /dev/null +++ b/libjava/classpath/java/awt/image/ConvolveOp.java @@ -0,0 +1,337 @@ +/* ConvolveOp.java -- + Copyright (C) 2004 Free Software Foundation -- ConvolveOp + +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; +import java.util.Arrays; + +/** + * Convolution filter. + * + * ConvolveOp convolves the source image with a Kernel to generate a + * destination image. This involves multiplying each pixel and its neighbors + * with elements in the kernel to compute a new pixel. + * + * Each band in a Raster is convolved and copied to the destination Raster. + * + * For BufferedImages, convolution is applied to all components. If the + * source is not premultiplied, the data will be premultiplied before + * convolving. Premultiplication will be undone if the destination is not + * premultiplied. Color conversion will be applied if needed. + * + * @author jlquinn@optonline.net + */ +public class ConvolveOp implements BufferedImageOp, RasterOp +{ + /** Edge pixels are set to 0. */ + public static final int EDGE_ZERO_FILL = 0; + + /** Edge pixels are copied from the source. */ + public static final int EDGE_NO_OP = 1; + + private Kernel kernel; + private int edge; + private RenderingHints hints; + + /** + * Construct a ConvolveOp. + * + * The edge condition specifies that pixels outside the area that can be + * filtered are either set to 0 or copied from the source image. + * + * @param kernel The kernel to convolve with. + * @param edgeCondition Either EDGE_ZERO_FILL or EDGE_NO_OP. + * @param hints Rendering hints for color conversion, or null. + */ + public ConvolveOp(Kernel kernel, + int edgeCondition, + RenderingHints hints) + { + this.kernel = kernel; + edge = edgeCondition; + this.hints = hints; + } + + /** + * Construct a ConvolveOp. + * + * The edge condition defaults to EDGE_ZERO_FILL. + * + * @param kernel The kernel to convolve with. + */ + public ConvolveOp(Kernel kernel) + { + this.kernel = kernel; + edge = EDGE_ZERO_FILL; + hints = null; + } + + + /* (non-Javadoc) + * @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, + * java.awt.image.BufferedImage) + */ + public BufferedImage filter(BufferedImage src, BufferedImage dst) + { + if (src == dst) + throw new IllegalArgumentException(); + + if (dst == null) + dst = createCompatibleDestImage(src, src.getColorModel()); + + // Make sure source image is premultiplied + BufferedImage src1 = src; + if (!src.isPremultiplied) + { + src1 = createCompatibleDestImage(src, src.getColorModel()); + src.copyData(src1.getRaster()); + src1.coerceData(true); + } + + BufferedImage dst1 = dst; + if (!src.getColorModel().equals(dst.getColorModel())) + dst1 = createCompatibleDestImage(src, src.getColorModel()); + + filter(src1.getRaster(), dst1.getRaster()); + + if (dst1 != dst) + { + // Convert between color models. + // TODO Check that premultiplied alpha is handled correctly here. + Graphics2D gg = dst.createGraphics(); + gg.setRenderingHints(hints); + gg.drawImage(dst1, 0, 0, null); + gg.dispose(); + } + + return dst; + } + + /* (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); + } + + /* (non-Javadoc) + * @see java.awt.image.RasterOp#getRenderingHints() + */ + public RenderingHints getRenderingHints() + { + return hints; + } + + /** + * @return The edge condition. + */ + public int getEdgeCondition() + { + return edge; + } + + /** + * @return The convolution kernel. + */ + public Kernel getKernel() + { + return kernel; + } + + /* (non-Javadoc) + * @see java.awt.image.RasterOp#filter(java.awt.image.Raster, + * java.awt.image.WritableRaster) + */ + public WritableRaster filter(Raster src, WritableRaster dest) { + if (src.numBands != dest.numBands) + throw new ImagingOpException(null); + if (src == dest) + throw new IllegalArgumentException(); + if (src.getWidth() < kernel.getWidth() || + src.getHeight() < kernel.getHeight()) + throw new ImagingOpException(null); + + if (dest == null) + dest = createCompatibleDestRaster(src); + + // Deal with bottom edge + if (edge == EDGE_ZERO_FILL) + { + float[] zeros = new float[src.getNumBands() * src.getWidth() + * (kernel.getYOrigin() - 1)]; + Arrays.fill(zeros, 0); + dest.setPixels(src.getMinX(), src.getMinY(), src.getWidth(), + kernel.getYOrigin() - 1, zeros); + } + else + { + float[] vals = new float[src.getNumBands() * src.getWidth() + * (kernel.getYOrigin() - 1)]; + src.getPixels(src.getMinX(), src.getMinY(), src.getWidth(), + kernel.getYOrigin() - 1, vals); + dest.setPixels(src.getMinX(), src.getMinY(), src.getWidth(), + kernel.getYOrigin() - 1, vals); + } + + // Handle main section + float[] kvals = kernel.getKernelData(null); + + float[] tmp = new float[kernel.getWidth() * kernel.getHeight()]; + for (int y = src.getMinY() + kernel.getYOrigin(); + y < src.getMinY() + src.getHeight() - kernel.getYOrigin() / 2; y++) + { + // Handle unfiltered edge pixels at start of line + float[] t1 = new float[(kernel.getXOrigin() - 1) * src.getNumBands()]; + if (edge == EDGE_ZERO_FILL) + Arrays.fill(t1, 0); + else + src.getPixels(src.getMinX(), y, kernel.getXOrigin() - 1, 1, t1); + dest.setPixels(src.getMinX(), y, kernel.getXOrigin() - 1, 1, t1); + + for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++) + { + // FIXME: This needs a much more efficient implementation + for (int b = 0; b < src.getNumBands(); b++) + { + float v = 0; + src.getSamples(x, y, kernel.getWidth(), kernel.getHeight(), b, tmp); + for (int i=0; i < tmp.length; i++) + v += tmp[i] * kvals[i]; + dest.setSample(x, y, b, v); + } + } + + // Handle unfiltered edge pixels at end of line + float[] t2 = new float[(kernel.getWidth() / 2) * src.getNumBands()]; + if (edge == EDGE_ZERO_FILL) + Arrays.fill(t2, 0); + else + src.getPixels(src.getMinX() + src.getWidth() + - (kernel.getWidth() / 2), + y, kernel.getWidth() / 2, 1, t2); + dest.setPixels(src.getMinX() + src.getWidth() - (kernel.getWidth() / 2), + y, kernel.getWidth() / 2, 1, t2); + } + for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++) + for (int x = src.getMinX(); x< src.getWidth() + src.getMinX(); x++) + { + + } + for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++) + for (int x = src.getMinX(); x< src.getWidth() + src.getMinX(); x++) + { + + } + + // Handle top edge + if (edge == EDGE_ZERO_FILL) + { + float[] zeros = new float[src.getNumBands() * src.getWidth() * + (kernel.getHeight() / 2)]; + Arrays.fill(zeros, 0); + dest.setPixels(src.getMinX(), + src.getHeight() + src.getMinY() - (kernel.getHeight() / 2), + src.getWidth(), kernel.getHeight() / 2, zeros); + } + else + { + float[] vals = new float[src.getNumBands() * src.getWidth() * + (kernel.getHeight() / 2)]; + src.getPixels(src.getMinX(), + src.getHeight() + src.getMinY() + - (kernel.getHeight() / 2), + src.getWidth(), kernel.getHeight() / 2, vals); + dest.setPixels(src.getMinX(), + src.getHeight() + src.getMinY() + - (kernel.getHeight() / 2), + src.getWidth(), kernel.getHeight() / 2, vals); + } + + return dest; + } + + /* (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 Rectangle2D getBounds2D(BufferedImage src) + { + return src.getRaster().getBounds(); + } + + /* (non-Javadoc) + * @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster) + */ + public Rectangle2D getBounds2D(Raster src) + { + return src.getBounds(); + } + + /** Return corresponding destination point for source point. + * + * ConvolveOp 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; + } +} |