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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/LookupOp.java
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+/* 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.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 using the given LookupTable.
+ *
+ * @param lookup LookupTable to use.
+ * @param hints Rendering hints (can be null).
+ */
+ public LookupOp(LookupTable lookup, RenderingHints hints)
+ {
+ lut = lookup;
+ this.hints = hints;
+ }
+
+ /**
+ * Converts the source image using the lookup table specified in the
+ * constructor. The resulting image is stored in the destination image if one
+ * is provided; otherwise a new BufferedImage is created and returned.
+ *
+ * The source image cannot use an IndexColorModel, and the destination image
+ * (if one is provided) must have the same size.
+ *
+ * @param src The source image.
+ * @param dst The destination image.
+ * @throws IllegalArgumentException if the rasters and/or color spaces are
+ * incompatible.
+ * @throws ArrayIndexOutOfBoundsException if a pixel in the source is not
+ * contained in the LookupTable.
+ * @return The convolved image.
+ */
+ public final BufferedImage filter(BufferedImage src, BufferedImage dst)
+ {
+ if (src.getColorModel() instanceof IndexColorModel)
+ throw new IllegalArgumentException("LookupOp.filter: IndexColorModel "
+ + "not allowed");
+
+ if (lut.getNumComponents() != 1
+ && lut.getNumComponents() != src.getColorModel().getNumComponents()
+ && lut.getNumComponents() != src.getColorModel().getNumColorComponents())
+ throw new IllegalArgumentException("LookupOp.filter: Incompatible " +
+ "lookup table and source image");
+
+ if (dst == null)
+ dst = createCompatibleDestImage(src, null);
+
+ else if (src.getHeight() != dst.getHeight() || src.getWidth() != dst.getWidth())
+ throw new IllegalArgumentException("Source and destination images are " +
+ "different sizes.");
+
+ // 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));
+
+ /* The reference implementation does not use LookupTable.lookupPixel,
+ * but rather it seems to copy the table into a native array. The
+ * effect of this (a probable bug in their implementation) is that
+ * an out-of-bounds lookup on a ByteLookupTable will *not* throw an
+ * out of bounds exception, but will instead return random garbage.
+ * A bad lookup on a ShortLookupTable, however, will throw an
+ * exception.
+ *
+ * Instead of mimicing this behaviour, we always throw an
+ * ArrayOutofBoundsException by virtue of using
+ * LookupTable.lookupPixle.
+ */
+ }
+ }
+ else
+ {
+ // 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)
+ new ColorConvertOp(hints).filter(tgt, dst);
+
+ 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)
+ {
+ if (dstCM != null)
+ return new BufferedImage(dstCM,
+ src.getRaster().createCompatibleWritableRaster(),
+ src.isAlphaPremultiplied(), null);
+
+ // This is a strange exception, done for compatibility with the reference
+ // (as demonstrated by a mauve testcase)
+ int imgType = src.getType();
+ if (imgType == BufferedImage.TYPE_USHORT_GRAY)
+ imgType = BufferedImage.TYPE_BYTE_GRAY;
+
+ return new BufferedImage(src.getWidth(), src.getHeight(), imgType);
+ }
+
+ /**
+ * Returns the corresponding destination point for a given source point.
+ *
+ * This Op will return the source point unchanged.
+ *
+ * @param src The source point.
+ * @param dst The destination point.
+ */
+ 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.
+ *
+ * @return The lookup table.
+ */
+ 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.
+ * @throws ArrayIndexOutOfBoundsException if a pixel in the source is not
+ * contained in the LookupTable.
+ */
+ 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("Source and destination rasters " +
+ "are incompatible.");
+
+ if (lut.getNumComponents() != 1
+ && lut.getNumComponents() != src.getNumBands())
+ throw new IllegalArgumentException("Lookup table is incompatible with " +
+ "this raster.");
+
+ // 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));
+
+ /* The reference implementation does not use LookupTable.lookupPixel,
+ * but rather it seems to copy the table into a native array. The
+ * effect of this (a probable bug in their implementation) is that
+ * an out-of-bounds lookup on a ByteLookupTable will *not* throw an
+ * out of bounds exception, but will instead return random garbage.
+ * A bad lookup on a ShortLookupTable, however, will throw an
+ * exception.
+ *
+ * Instead of mimicing this behaviour, we always throw an
+ * ArrayOutofBoundsException by virtue of using
+ * LookupTable.lookupPixle.
+ */
+ 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();
+ }
+
+}