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/*
* Copyright (c) 2008, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.twelvemonkeys.image;
import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.*;
/**
* This class implements a convolution from the source
* to the destination.
*
* @author Harald Kuhr
* @author last modified by $Author: haku $
* @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/image/ConvolveWithEdgeOp.java#1 $
*
* @see java.awt.image.ConvolveOp
*/
public class ConvolveWithEdgeOp implements BufferedImageOp, RasterOp {
/**
* Alias for {@link ConvolveOp#EDGE_ZERO_FILL}.
* @see #EDGE_REFLECT
*/
public static final int EDGE_ZERO_FILL = ConvolveOp.EDGE_ZERO_FILL;
/**
* Alias for {@link ConvolveOp#EDGE_NO_OP}.
* @see #EDGE_REFLECT
*/
public static final int EDGE_NO_OP = ConvolveOp.EDGE_NO_OP;
/**
* Adds a border to the image while convolving. The border will reflect the
* edges of the original image. This is usually a good default.
* Note that while this mode typically provides better quality than the
* standard modes {@code EDGE_ZERO_FILL} and {@code EDGE_NO_OP}, it does so
* at the expense of higher memory consumption and considerable more computation.
*/
public static final int EDGE_REFLECT = 2; // as JAI BORDER_REFLECT
/**
* Adds a border to the image while convolving. The border will wrap the
* edges of the original image. This is usually the best choice for tiles.
* Note that while this mode typically provides better quality than the
* standard modes {@code EDGE_ZERO_FILL} and {@code EDGE_NO_OP}, it does so
* at the expense of higher memory consumption and considerable more computation.
* @see #EDGE_REFLECT
*/
public static final int EDGE_WRAP = 3; // as JAI BORDER_WRAP
private final Kernel kernel;
private final int edgeCondition;
private final ConvolveOp convolve;
public ConvolveWithEdgeOp(final Kernel pKernel, final int pEdgeCondition, final RenderingHints pHints) {
// Create convolution operation
int edge;
switch (pEdgeCondition) {
case EDGE_REFLECT:
case EDGE_WRAP:
edge = ConvolveOp.EDGE_NO_OP;
break;
default:
edge = pEdgeCondition;
break;
}
kernel = pKernel;
edgeCondition = pEdgeCondition;
convolve = new ConvolveOp(pKernel, edge, pHints);
}
public ConvolveWithEdgeOp(final Kernel pKernel) {
this(pKernel, EDGE_ZERO_FILL, null);
}
public BufferedImage filter(BufferedImage pSource, BufferedImage pDestination) {
if (pSource == null) {
throw new NullPointerException("source image is null");
}
if (pSource == pDestination) {
throw new IllegalArgumentException("source image cannot be the same as the destination image");
}
int borderX = kernel.getWidth() / 2;
int borderY = kernel.getHeight() / 2;
BufferedImage original = addBorder(pSource, borderX, borderY);
// Workaround for what seems to be a Java2D bug:
// ConvolveOp needs explicit destination image type for some "uncommon"
// image types. However, TYPE_3BYTE_BGR is what javax.imageio.ImageIO
// normally returns for color JPEGs... :-/
BufferedImage destination = pDestination;
if (original.getType() == BufferedImage.TYPE_3BYTE_BGR) {
destination = ImageUtil.createBuffered(
pSource.getWidth(), pSource.getHeight(),
pSource.getType(), pSource.getColorModel().getTransparency(),
null
);
}
// Do the filtering (if destination is null, a new image will be created)
destination = convolve.filter(original, destination);
if (pSource != original) {
// Remove the border
destination = destination.getSubimage(borderX, borderY, pSource.getWidth(), pSource.getHeight());
}
return destination;
}
private BufferedImage addBorder(final BufferedImage pOriginal, final int pBorderX, final int pBorderY) {
if ((edgeCondition & 2) == 0) {
return pOriginal;
}
// TODO: Might be faster if we could clone raster and stretch it...
int w = pOriginal.getWidth();
int h = pOriginal.getHeight();
ColorModel cm = pOriginal.getColorModel();
WritableRaster raster = cm.createCompatibleWritableRaster(w + 2 * pBorderX, h + 2 * pBorderY);
BufferedImage bordered = new BufferedImage(cm, raster, cm.isAlphaPremultiplied(), null);
Graphics2D g = bordered.createGraphics();
try {
g.setComposite(AlphaComposite.Src);
g.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_DISABLE);
// Draw original in center
g.drawImage(pOriginal, pBorderX, pBorderY, null);
// TODO: I guess we need the top/left etc, if the corner pixels are covered by the kernel
switch (edgeCondition) {
case EDGE_REFLECT:
// Top/left (empty)
g.drawImage(pOriginal, pBorderX, 0, pBorderX + w, pBorderY, 0, 0, w, 1, null); // Top/center
// Top/right (empty)
g.drawImage(pOriginal, -w + pBorderX, pBorderY, pBorderX, h + pBorderY, 0, 0, 1, h, null); // Center/left
// Center/center (already drawn)
g.drawImage(pOriginal, w + pBorderX, pBorderY, 2 * pBorderX + w, h + pBorderY, w - 1, 0, w, h, null); // Center/right
// Bottom/left (empty)
g.drawImage(pOriginal, pBorderX, pBorderY + h, pBorderX + w, 2 * pBorderY + h, 0, h - 1, w, h, null); // Bottom/center
// Bottom/right (empty)
break;
case EDGE_WRAP:
g.drawImage(pOriginal, -w + pBorderX, -h + pBorderY, null); // Top/left
g.drawImage(pOriginal, pBorderX, -h + pBorderY, null); // Top/center
g.drawImage(pOriginal, w + pBorderX, -h + pBorderY, null); // Top/right
g.drawImage(pOriginal, -w + pBorderX, pBorderY, null); // Center/left
// Center/center (already drawn)
g.drawImage(pOriginal, w + pBorderX, pBorderY, null); // Center/right
g.drawImage(pOriginal, -w + pBorderX, h + pBorderY, null); // Bottom/left
g.drawImage(pOriginal, pBorderX, h + pBorderY, null); // Bottom/center
g.drawImage(pOriginal, w + pBorderX, h + pBorderY, null); // Bottom/right
break;
default:
throw new IllegalArgumentException("Illegal edge operation " + edgeCondition);
}
}
finally {
g.dispose();
}
return bordered;
}
/**
* Returns the edge condition.
* @return the edge condition of this {@code ConvolveOp}.
* @see #EDGE_NO_OP
* @see #EDGE_ZERO_FILL
* @see #EDGE_REFLECT
* @see #EDGE_WRAP
*/
public int getEdgeCondition() {
return edgeCondition;
}
public WritableRaster filter(final Raster pSource, final WritableRaster pDestination) {
return convolve.filter(pSource, pDestination);
}
public BufferedImage createCompatibleDestImage(final BufferedImage pSource, final ColorModel pDesinationColorModel) {
return convolve.createCompatibleDestImage(pSource, pDesinationColorModel);
}
public WritableRaster createCompatibleDestRaster(final Raster pSource) {
return convolve.createCompatibleDestRaster(pSource);
}
public Rectangle2D getBounds2D(final BufferedImage pSource) {
return convolve.getBounds2D(pSource);
}
public Rectangle2D getBounds2D(final Raster pSource) {
return convolve.getBounds2D(pSource);
}
public Point2D getPoint2D(final Point2D pSourcePoint, final Point2D pDestinationPoint) {
return convolve.getPoint2D(pSourcePoint, pDestinationPoint);
}
public RenderingHints getRenderingHints() {
return convolve.getRenderingHints();
}
public Kernel getKernel() {
return convolve.getKernel();
}
}
