mirror of
https://github.com/haraldk/TwelveMonkeys.git
synced 2026-04-30 00:00:01 -04:00
Added fast conversion from CMYK to RGB for non-ICC cases.
This commit is contained in:
Harald Kuhr
+189
@@ -0,0 +1,189 @@
|
||||
/*
|
||||
* Copyright (c) 2011, 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 "TwelveMonkeys" 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 OWNER 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.imageio.plugins.jpeg;
|
||||
|
||||
import com.twelvemonkeys.lang.Validate;
|
||||
|
||||
import java.awt.*;
|
||||
import java.awt.geom.Point2D;
|
||||
import java.awt.geom.Rectangle2D;
|
||||
import java.awt.image.*;
|
||||
|
||||
/**
|
||||
* This class performs a pixel by pixel conversion of the source image, from CMYK to RGB.
|
||||
* <p/>
|
||||
* The conversion is fast, but performed without any color space conversion.
|
||||
*
|
||||
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
|
||||
* @author last modified by $Author: haraldk$
|
||||
* @version $Id: FastCMYKToRGB.java,v 1.0 21.02.11 13.22 haraldk Exp$
|
||||
* @see ColorConvertOp
|
||||
*/
|
||||
class FastCMYKToRGB implements /*BufferedImageOp,*/ RasterOp {
|
||||
// TODO: Force dest alpha to match source alpha?
|
||||
|
||||
public FastCMYKToRGB() {
|
||||
}
|
||||
|
||||
/**
|
||||
* Converts the CMYK source raster to the destination RGB raster.
|
||||
*
|
||||
* @param src assumed to be 4 byte CMYK
|
||||
* @param dest raster, in either 3 byte BGR/BGR, 4 byte ABGR or int RGB/ARGB format, or {@code null}
|
||||
* @return {@code dest}, or a new {@link WritableRaster} if {@code dest} is {@code null}.
|
||||
* @throws IllegalArgumentException if {@code src} and {@code dest} refer to the same object
|
||||
*/
|
||||
public WritableRaster filter(Raster src, WritableRaster dest) {
|
||||
Validate.notNull(src, "src may not be null");
|
||||
// TODO: Why not allow same raster, if converting to 4 byte ABGR?
|
||||
Validate.isTrue(src != dest, "src and dest raster may not be same");
|
||||
Validate.isTrue(src.getTransferType() == DataBuffer.TYPE_BYTE, src, "only TYPE_BYTE rasters supported as src: %s");
|
||||
Validate.isTrue(src.getNumDataElements() >= 4, src.getNumDataElements(), "CMYK raster must have at least 4 data elements: %s");
|
||||
|
||||
if (dest == null) {
|
||||
dest = createCompatibleDestRaster(src);
|
||||
}
|
||||
else {
|
||||
Validate.isTrue(
|
||||
dest.getTransferType() == DataBuffer.TYPE_BYTE && dest.getNumDataElements() >= 3 ||
|
||||
dest.getTransferType() == DataBuffer.TYPE_INT && dest.getNumDataElements() == 1,
|
||||
src,
|
||||
"only 3 or 4 byte TYPE_BYTE or 1 int TYPE_INT rasters supported as dest: %s"
|
||||
);
|
||||
}
|
||||
|
||||
final int height = src.getHeight();
|
||||
final int width = src.getWidth();
|
||||
|
||||
final byte[] in = new byte[src.getNumDataElements()]; // CMYK
|
||||
|
||||
if (dest.getTransferType() == DataBuffer.TYPE_BYTE) {
|
||||
final byte[] out = new byte[dest.getNumDataElements()];
|
||||
|
||||
if (out.length > 3) {
|
||||
out[3] = (byte) 0xFF;
|
||||
}
|
||||
|
||||
for (int y = dest.getMinY(); y < height; y++) {
|
||||
for (int x = dest.getMinX(); x < width; x++) {
|
||||
src.getDataElements(x, y, in);
|
||||
convertCMYKToRGB(in, out);
|
||||
dest.setDataElements(x, y, out);
|
||||
}
|
||||
}
|
||||
}
|
||||
else if (dest.getTransferType() == DataBuffer.TYPE_INT) {
|
||||
final int[] out = new int[dest.getNumDataElements()];
|
||||
final byte[] temp = new byte[3]; // RGB
|
||||
|
||||
// Special case for INT_BGR types, as bit offsets are not handled in setDataElements like for the byte raster case
|
||||
int[] bitOffsets;
|
||||
SampleModel sm = dest.getSampleModel();
|
||||
if (sm instanceof SinglePixelPackedSampleModel) {
|
||||
bitOffsets = ((SinglePixelPackedSampleModel) sm).getBitOffsets();
|
||||
}
|
||||
else {
|
||||
bitOffsets = new int[]{0, 8, 16};
|
||||
}
|
||||
|
||||
final int alpha = bitOffsets.length > 3 ? 0xFF : 0x00;
|
||||
|
||||
for (int y = dest.getMinY(); y < height; y++) {
|
||||
for (int x = dest.getMinX(); x < width; x++) {
|
||||
src.getDataElements(x, y, in);
|
||||
convertCMYKToRGB(in, temp);
|
||||
out[0] = alpha << 24 | (temp[0] & 0xFF) << bitOffsets[0] | (temp[1] & 0xFF) << bitOffsets[1] | (temp[2] & 0xFF) << bitOffsets[2];
|
||||
dest.setDataElements(x, y, out);
|
||||
}
|
||||
}
|
||||
}
|
||||
else {
|
||||
// This is already tested for
|
||||
throw new AssertionError();
|
||||
}
|
||||
|
||||
return dest;
|
||||
}
|
||||
|
||||
@SuppressWarnings({"PointlessArithmeticExpression"})
|
||||
private void convertCMYKToRGB(byte[] cmyk, byte[] rgb) {
|
||||
rgb[0] = (byte) (((255 - cmyk[0] & 0xFF) * (255 - cmyk[3] & 0xFF)) / 255);
|
||||
rgb[1] = (byte) (((255 - cmyk[1] & 0xFF) * (255 - cmyk[3] & 0xFF)) / 255);
|
||||
rgb[2] = (byte) (((255 - cmyk[2] & 0xFF) * (255 - cmyk[3] & 0xFF)) / 255);
|
||||
}
|
||||
|
||||
public Rectangle2D getBounds2D(Raster src) {
|
||||
return src.getBounds();
|
||||
}
|
||||
|
||||
public WritableRaster createCompatibleDestRaster(final Raster src) {
|
||||
return src.createChild(0, 0, src.getWidth(), src.getHeight(), 0, 0, new int[]{0, 1, 2}).createCompatibleWritableRaster();
|
||||
}
|
||||
|
||||
/*
|
||||
public BufferedImage filter(BufferedImage src, BufferedImage dest) {
|
||||
Validate.notNull(src, "src may not be null");
|
||||
// Validate.isTrue(src != dest, "src and dest image may not be same");
|
||||
|
||||
if (dest == null) {
|
||||
dest = createCompatibleDestImage(src, ColorModel.getRGBdefault());
|
||||
}
|
||||
|
||||
filter(src.getRaster(), dest.getRaster());
|
||||
|
||||
return dest;
|
||||
}
|
||||
|
||||
public Rectangle2D getBounds2D(BufferedImage src) {
|
||||
return getBounds2D(src.getRaster());
|
||||
}
|
||||
|
||||
public BufferedImage createCompatibleDestImage(BufferedImage src, ColorModel destCM) {
|
||||
// TODO: dest color model depends on bands...
|
||||
return destCM == null ?
|
||||
new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_3BYTE_BGR) :
|
||||
new BufferedImage(destCM, destCM.createCompatibleWritableRaster(src.getWidth(), src.getHeight()), destCM.isAlphaPremultiplied(), null);
|
||||
}
|
||||
*/
|
||||
|
||||
public Point2D getPoint2D(Point2D srcPt, Point2D dstPt) {
|
||||
if (dstPt == null) {
|
||||
dstPt = new Point2D.Double(srcPt.getX(), srcPt.getY());
|
||||
}
|
||||
else {
|
||||
dstPt.setLocation(srcPt);
|
||||
}
|
||||
|
||||
return dstPt;
|
||||
}
|
||||
|
||||
public RenderingHints getRenderingHints() {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user