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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 BufferedImageOp simply copies pixels, converting to a
* {@code IndexColorModel}.
* @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/CopyDither.java#1 $
*
*/
public class CopyDither implements BufferedImageOp, RasterOp {
protected IndexColorModel indexColorModel = null;
/**
* Creates a {@code CopyDither}, using the given
* {@code IndexColorModel} for dithering into.
*
* @param pICM an IndexColorModel.
*/
public CopyDither(IndexColorModel pICM) {
// Store colormodel
indexColorModel = pICM;
}
/**
* Creates a {@code CopyDither}, with no fixed
* {@code IndexColorModel}. The colormodel will be generated for each
* filtering, unless the dest image allready has an
* {@code IndexColorModel}.
*/
public CopyDither() {
}
/**
* Creates a compatible {@code BufferedImage} to dither into.
* Only {@code IndexColorModel} allowed.
*
* @return a compatible {@code BufferedImage}
*
* @throws ImageFilterException if {@code pDestCM} is not {@code null} or
* an instance of {@code IndexColorModel}.
*/
public final BufferedImage createCompatibleDestImage(BufferedImage pSource, ColorModel pDestCM) {
if (pDestCM == null) {
return new BufferedImage(pSource.getWidth(), pSource.getHeight(), BufferedImage.TYPE_BYTE_INDEXED, indexColorModel);
}
else if (pDestCM instanceof IndexColorModel) {
return new BufferedImage(pSource.getWidth(), pSource.getHeight(), BufferedImage.TYPE_BYTE_INDEXED, (IndexColorModel) pDestCM);
}
else {
throw new ImageFilterException("Only IndexColorModel allowed.");
}
}
/**
* Creates a compatible {@code Raster} to dither into.
* Only {@code IndexColorModel} allowed.
*
* @param pSrc
*
* @return a {@code WritableRaster}
*/
public final WritableRaster createCompatibleDestRaster(Raster pSrc) {
return createCompatibleDestRaster(pSrc, getICM(pSrc));
}
public final WritableRaster createCompatibleDestRaster(Raster pSrc, IndexColorModel pIndexColorModel) {
return pIndexColorModel.createCompatibleWritableRaster(pSrc.getWidth(), pSrc.getHeight());
}
/**
* Returns the bounding box of the filtered destination image. Since
* this is not a geometric operation, the bounding box does not
* change.
* @param pSrc the {@code BufferedImage} to be filtered
* @return the bounds of the filtered definition image.
*/
public final Rectangle2D getBounds2D(BufferedImage pSrc) {
return getBounds2D(pSrc.getRaster());
}
/**
* Returns the bounding box of the filtered destination Raster. Since
* this is not a geometric operation, the bounding box does not
* change.
* @param pSrc the {@code Raster} to be filtered
* @return the bounds of the filtered definition {@code Raster}.
*/
public final Rectangle2D getBounds2D(Raster pSrc) {
return pSrc.getBounds();
}
/**
* Returns the location of the destination point given a
* point in the source. If {@code dstPt} is not
* {@code null}, it will be used to hold the return value.
* Since this is not a geometric operation, the {@code srcPt}
* will equal the {@code dstPt}.
* @param pSrcPt a {@code Point2D} that represents a point
* in the source image
* @param pDstPt a {@code Point2D}that represents the location
* in the destination
* @return the {@code Point2D} in the destination that
* corresponds to the specified point in the source.
*/
public final Point2D getPoint2D(Point2D pSrcPt, Point2D pDstPt) {
// Create new Point, if needed
if (pDstPt == null) {
pDstPt = new Point2D.Float();
}
// Copy location
pDstPt.setLocation(pSrcPt.getX(), pSrcPt.getY());
// Return dest
return pDstPt;
}
/**
* Returns the rendering mHints for this op.
* @return the {@code RenderingHints} object associated
* with this op.
*/
public final RenderingHints getRenderingHints() {
return null;
}
/**
* Converts a int triplet to int ARGB.
*/
private static int toIntARGB(int[] pRGB) {
return 0xff000000 // All opaque
| (pRGB[0] << 16)
| (pRGB[1] << 8)
| (pRGB[2]);
/*
| ((int) (pRGB[0] << 16) & 0x00ff0000)
| ((int) (pRGB[1] << 8) & 0x0000ff00)
| ((int) (pRGB[2] ) & 0x000000ff);
*/
}
/**
* Performs a single-input/single-output dither operation, applying basic
* Floyd-Steinberg error-diffusion to the image.
*
* @param pSource the source image
* @param pDest the destiantion image
*
* @return the destination image, or a new image, if {@code pDest} was
* {@code null}.
*/
public final BufferedImage filter(BufferedImage pSource, BufferedImage pDest) {
// Create destination image, if none provided
if (pDest == null) {
pDest = createCompatibleDestImage(pSource, getICM(pSource));
}
else if (!(pDest.getColorModel() instanceof IndexColorModel)) {
throw new ImageFilterException("Only IndexColorModel allowed.");
}
// Filter rasters
filter(pSource.getRaster(), pDest.getRaster(), (IndexColorModel) pDest.getColorModel());
return pDest;
}
/**
* Performs a single-input/single-output dither operation, applying basic
* Floyd-Steinberg error-diffusion to the image.
*
* @param pSource
* @param pDest
*
* @return the destination raster, or a new raster, if {@code pDest} was
* {@code null}.
*/
public final WritableRaster filter(final Raster pSource, WritableRaster pDest) {
return filter(pSource, pDest, getICM(pSource));
}
private IndexColorModel getICM(BufferedImage pSource) {
return (indexColorModel != null ? indexColorModel : IndexImage.getIndexColorModel(pSource, 256, IndexImage.TRANSPARENCY_BITMASK | IndexImage.COLOR_SELECTION_QUALITY));
}
private IndexColorModel getICM(Raster pSource) {
return (indexColorModel != null ? indexColorModel : createIndexColorModel(pSource));
}
private IndexColorModel createIndexColorModel(Raster pSource) {
BufferedImage image = new BufferedImage(pSource.getWidth(), pSource.getHeight(), BufferedImage.TYPE_INT_ARGB);
image.setData(pSource);
return IndexImage.getIndexColorModel(image, 256, IndexImage.TRANSPARENCY_BITMASK | IndexImage.COLOR_SELECTION_QUALITY);
}
/**
* Performs a single-input/single-output pixel copy operation.
*
* @param pSource
* @param pDest
* @param pColorModel
*
* @return the destination raster, or a new raster, if {@code pDest} was
* {@code null}.
*/
public final WritableRaster filter(final Raster pSource, WritableRaster pDest, IndexColorModel pColorModel) {
int width = pSource.getWidth();
int height = pSource.getHeight();
if (pDest == null) {
pDest = createCompatibleDestRaster(pSource, pColorModel);
}
// temp buffers
final int[] inRGB = new int[4];
Object pixel = null;
// TODO: Use getPixels instead of getPixel for better performance?
// Loop through image data
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
// Get rgb from original raster
// DON'T KNOW IF THIS WILL WORK FOR ALL TYPES..?
pSource.getPixel(x, y, inRGB);
// Get pixel value...
// It is VERY important that we are using an IndexColorModel that
// support reverse color lookup for speed.
pixel = pColorModel.getDataElements(toIntARGB(inRGB), pixel);
// And set it
pDest.setDataElements(x, y, pixel);
}
}
return pDest;
}
}
