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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: Any2LsRGBRed.java 1732018 2016-02-24 04:51:06Z gadams $ */
package org.apache.xmlgraphics.image.rendered;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.color.ColorSpace;
import java.awt.image.BandCombineOp;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.Raster;
import java.awt.image.SampleModel;
import java.awt.image.SinglePixelPackedSampleModel;
import java.awt.image.WritableRaster;
import org.apache.xmlgraphics.image.GraphicsUtil;
// CSOFF: ConstantName
// CSOFF: NeedBraces
// CSOFF: WhitespaceAfter
// CSOFF: WhitespaceAround
/**
* This function will tranform an image from any colorspace into a
* luminance image. The alpha channel if any will be copied to the
* new image.
*
* @version $Id: Any2LsRGBRed.java 1732018 2016-02-24 04:51:06Z gadams $
*
* Originally authored by Thomas DeWeese.
*/
public class Any2LsRGBRed extends AbstractRed {
boolean srcIssRGB;
/**
* Construct a luminace image from src.
*
* @param src The image to convert to a luminance image
*/
public Any2LsRGBRed(CachableRed src) {
super(src, src.getBounds(),
fixColorModel(src),
fixSampleModel(src),
src.getTileGridXOffset(),
src.getTileGridYOffset(),
null);
ColorModel srcCM = src.getColorModel();
if (srcCM == null) {
return;
}
ColorSpace srcCS = srcCM.getColorSpace();
if (srcCS == ColorSpace.getInstance(ColorSpace.CS_sRGB)) {
srcIssRGB = true;
}
}
/**
* Gamma for linear to sRGB convertion
*/
private static final double GAMMA = 2.4;
private static final double LFACT = 1.0 / 12.92;
public static final double sRGBToLsRGB(double value) {
if (value <= 0.003928) {
return value * LFACT;
}
return Math.pow((value + 0.055) / 1.055, GAMMA);
}
/**
* Lookup tables for RGB lookups. The linearToSRGBLut is used
* when noise values are considered to be on a linearScale. The
* linearToLinear table is used when the values are considered to
* be on the sRGB scale to begin with.
*/
private static final int[] sRGBToLsRGBLut = new int[256];
static {
final double scale = 1.0 / 255;
// System.out.print("S2L: ");
for (int i = 0; i < 256; i++) {
double value = sRGBToLsRGB(i * scale);
sRGBToLsRGBLut[i] = (int)Math.round(value * 255.0);
// System.out.print(sRGBToLsRGBLut[i] + ",");
}
// System.out.println("");
}
public WritableRaster copyData(WritableRaster wr) {
// Get my source.
CachableRed src = (CachableRed)getSources().get(0);
ColorModel srcCM = src.getColorModel();
SampleModel srcSM = src.getSampleModel();
// Fast case, SRGB source, INT Pack writable raster...
if (srcIssRGB
&& Any2sRGBRed.is_INT_PACK_COMP(wr.getSampleModel())) {
src.copyData(wr);
if (srcCM.hasAlpha()) {
GraphicsUtil.coerceData(wr, srcCM, false);
}
Any2sRGBRed.applyLut_INT(wr, sRGBToLsRGBLut);
return wr;
}
if (srcCM == null) {
// We don't really know much about this source, let's
// guess based on the number of bands...
float [][] matrix = null;
switch (srcSM.getNumBands()) {
case 1:
matrix = new float[1][3];
matrix[0][0] = 1; // Red
matrix[0][1] = 1; // Grn
matrix[0][2] = 1; // Blu
break;
case 2:
matrix = new float[2][4];
matrix[0][0] = 1; // Red
matrix[0][1] = 1; // Grn
matrix[0][2] = 1; // Blu
matrix[1][3] = 1; // Alpha
break;
case 3:
matrix = new float[3][3];
matrix[0][0] = 1; // Red
matrix[1][1] = 1; // Grn
matrix[2][2] = 1; // Blu
break;
default:
matrix = new float[srcSM.getNumBands()][4];
matrix[0][0] = 1; // Red
matrix[1][1] = 1; // Grn
matrix[2][2] = 1; // Blu
matrix[3][3] = 1; // Alpha
break;
}
Raster srcRas = src.getData(wr.getBounds());
BandCombineOp op = new BandCombineOp(matrix, null);
op.filter(srcRas, wr);
} else {
ColorModel dstCM = getColorModel();
BufferedImage dstBI;
if (!dstCM.hasAlpha()) {
// No alpha ao we don't have to work around the bug
// in the color convert op.
dstBI = new BufferedImage(
dstCM, wr.createWritableTranslatedChild(0, 0),
dstCM.isAlphaPremultiplied(), null);
} else {
// All this nonsense is to work around the fact that
// the Color convert op doesn't properly copy the
// Alpha from src to dst.
SinglePixelPackedSampleModel dstSM;
dstSM = (SinglePixelPackedSampleModel)wr.getSampleModel();
int [] masks = dstSM.getBitMasks();
SampleModel dstSMNoA = new SinglePixelPackedSampleModel(
dstSM.getDataType(), dstSM.getWidth(), dstSM.getHeight(),
dstSM.getScanlineStride(),
new int[] {masks[0], masks[1], masks[2]});
ColorModel dstCMNoA = GraphicsUtil.Linear_sRGB;
WritableRaster dstWr;
dstWr = Raster.createWritableRaster(dstSMNoA,
wr.getDataBuffer(),
new Point(0, 0));
dstWr = dstWr.createWritableChild(
wr.getMinX() - wr.getSampleModelTranslateX(),
wr.getMinY() - wr.getSampleModelTranslateY(),
wr.getWidth(), wr.getHeight(),
0, 0, null);
dstBI = new BufferedImage(dstCMNoA, dstWr, false, null);
}
// Divide out alpha if we have it. We need to do this since
// the color convert may not be a linear operation which may
// lead to out of range values.
ColorModel srcBICM = srcCM;
WritableRaster srcWr;
if (srcCM.hasAlpha() && srcCM.isAlphaPremultiplied()) {
Rectangle wrR = wr.getBounds();
SampleModel sm = srcCM.createCompatibleSampleModel(
wrR.width, wrR.height);
srcWr = Raster.createWritableRaster(
sm, new Point(wrR.x, wrR.y));
src.copyData(srcWr);
srcBICM = GraphicsUtil.coerceData(srcWr, srcCM, false);
} else {
Raster srcRas = src.getData(wr.getBounds());
srcWr = GraphicsUtil.makeRasterWritable(srcRas);
}
BufferedImage srcBI;
srcBI = new BufferedImage(srcBICM,
srcWr.createWritableTranslatedChild(0, 0),
false,
null);
/*
* System.out.println("src: " + srcBI.getWidth() + "x" +
* srcBI.getHeight());
* System.out.println("dst: " + dstBI.getWidth() + "x" +
* dstBI.getHeight());
*/
ColorConvertOp op = new ColorConvertOp(null);
op.filter(srcBI, dstBI);
if (dstCM.hasAlpha()) {
copyBand(srcWr, srcSM.getNumBands() - 1,
wr, getSampleModel().getNumBands() - 1);
}
}
return wr;
}
/**
* This function 'fixes' the source's color model. Right now
* it just selects if it should have one or two bands based on
* if the source had an alpha channel.
*/
protected static ColorModel fixColorModel(CachableRed src) {
ColorModel cm = src.getColorModel();
if (cm != null) {
if (cm.hasAlpha()) {
return GraphicsUtil.Linear_sRGB_Unpre;
}
return GraphicsUtil.Linear_sRGB;
} else {
// No ColorModel so try to make some intelligent
// decisions based just on the number of bands...
// 1 bands -> replicated into RGB
// 2 bands -> Band 0 replicated into RGB & Band 1 -> alpha premult
// 3 bands -> sRGB (not-linear?)
// 4 bands -> sRGB premult (not-linear?)
SampleModel sm = src.getSampleModel();
switch (sm.getNumBands()) {
case 1:
return GraphicsUtil.Linear_sRGB;
case 2:
return GraphicsUtil.Linear_sRGB_Unpre;
case 3:
return GraphicsUtil.Linear_sRGB;
default:
return GraphicsUtil.Linear_sRGB_Unpre;
}
}
}
/**
* This function 'fixes' the source's sample model.
* Right now it just selects if it should have 3 or 4 bands
* based on if the source had an alpha channel.
*/
protected static SampleModel fixSampleModel(CachableRed src) {
SampleModel sm = src.getSampleModel();
ColorModel cm = src.getColorModel();
boolean alpha = false;
if (cm != null) {
alpha = cm.hasAlpha();
} else {
switch (sm.getNumBands()) {
case 1: case 3:
alpha = false;
break;
default:
alpha = true;
break;
}
}
if (alpha) {
return new SinglePixelPackedSampleModel(
DataBuffer.TYPE_INT,
sm.getWidth(),
sm.getHeight(),
new int [] {0xFF0000, 0xFF00, 0xFF, 0xFF000000});
} else {
return new SinglePixelPackedSampleModel(
DataBuffer.TYPE_INT,
sm.getWidth(),
sm.getHeight(),
new int [] {0xFF0000, 0xFF00, 0xFF});
}
}
}
