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Apache XML Graphics Commons is a library that consists of several reusable
components used by Apache Batik and Apache FOP. Many of these components
can easily be used separately outside the domains of SVG and XSL-FO.
/*
* 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: Any2sRGBRed.java 1732018 2016-02-24 04:51:06Z gadams $ */
package org.apache.xmlgraphics.image.rendered;
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.DataBufferInt;
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: MethodName
// CSOFF: MultipleVariableDeclarations
// CSOFF: NeedBraces
// CSOFF: OperatorWrap
// 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: Any2sRGBRed.java 1732018 2016-02-24 04:51:06Z gadams $
*
* Originally authored by Thomas DeWeese.
*/
public class Any2sRGBRed extends AbstractRed {
boolean srcIsLsRGB;
/**
* Construct a luminace image from src.
*
* @param src The image to convert to a luminance image
*/
public Any2sRGBRed(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_LINEAR_RGB)) {
srcIsLsRGB = true;
}
}
public static boolean is_INT_PACK_COMP(SampleModel sm) {
if (!(sm instanceof SinglePixelPackedSampleModel)) {
return false;
}
// Check transfer types
if (sm.getDataType() != DataBuffer.TYPE_INT) {
return false;
}
SinglePixelPackedSampleModel sppsm;
sppsm = (SinglePixelPackedSampleModel)sm;
int [] masks = sppsm.getBitMasks();
if ((masks.length != 3) && (masks.length != 4)) {
return false;
}
if (masks[0] != 0x00ff0000) {
return false;
}
if (masks[1] != 0x0000ff00) {
return false;
}
if (masks[2] != 0x000000ff) {
return false;
}
if ((masks.length == 4)
&& (masks[3] != 0xff000000)) {
return false;
}
return true;
}
/**
* Exponent for linear to sRGB convertion
*/
private static final double GAMMA = 2.4;
/**
* 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[] linearToSRGBLut = new int[256];
static {
final double scale = 1.0 / 255;
final double exp = 1.0 / GAMMA;
// System.out.print("L2S: ");
for (int i = 0; i < 256; i++) {
double value = i * scale;
if (value <= 0.0031308) {
value *= 12.92;
} else {
value = 1.055 * Math.pow(value, exp) - 0.055;
}
linearToSRGBLut[i] = (int)Math.round(value * 255.);
// System.out.print(linearToSRGBLut[i] + ",");
}
// System.out.println("");
}
public static WritableRaster applyLut_INT(WritableRaster wr,
final int []lut) {
SinglePixelPackedSampleModel sm =
(SinglePixelPackedSampleModel)wr.getSampleModel();
DataBufferInt db = (DataBufferInt)wr.getDataBuffer();
final int srcBase
= (db.getOffset()
+ sm.getOffset(wr.getMinX() - wr.getSampleModelTranslateX(),
wr.getMinY() - wr.getSampleModelTranslateY()));
// Access the pixel data array
final int[] pixels = db.getBankData()[0];
final int width = wr.getWidth();
final int height = wr.getHeight();
final int scanStride = sm.getScanlineStride();
int end;
int pix;
// For alpha premult we need to multiply all comps.
for (int y = 0; y < height; y++) {
int sp = srcBase + y * scanStride;
end = sp + width;
while (sp < end) {
pix = pixels[sp];
pixels[sp] =
((pix & 0xFF000000)
| (lut[(pix >>> 16) & 0xFF] << 16)
| (lut[(pix >>> 8) & 0xFF] << 8)
| (lut[pix & 0xFF]));
sp++;
}
}
return wr;
}
public WritableRaster copyData(WritableRaster wr) {
// Get my source.
CachableRed src = (CachableRed)getSources().get(0);
ColorModel srcCM = src.getColorModel();
SampleModel srcSM = src.getSampleModel();
// Fast case, Linear SRGB source, INT Pack writable raster...
if (srcIsLsRGB
&& is_INT_PACK_COMP(wr.getSampleModel())) {
src.copyData(wr);
if (srcCM.hasAlpha()) {
GraphicsUtil.coerceData(wr, srcCM, false);
}
applyLut_INT(wr, linearToSRGBLut);
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[3][1];
matrix[0][0] = 1; // Red
matrix[1][0] = 1; // Grn
matrix[2][0] = 1; // Blu
break;
case 2:
matrix = new float[4][2];
matrix[0][0] = 1; // Red
matrix[1][0] = 1; // Grn
matrix[3][0] = 1; // Blu
matrix[3][1] = 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[4][srcSM.getNumBands()];
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);
return wr;
}
if (srcCM.getColorSpace()
== ColorSpace.getInstance(ColorSpace.CS_GRAY)) {
// This is a little bit of a hack. There is only
// a linear grayscale ICC profile in the JDK so
// many things use this when the data _really_
// has sRGB gamma applied.
try {
float [][] matrix = null;
switch (srcSM.getNumBands()) {
case 1:
matrix = new float[3][1];
matrix[0][0] = 1; // Red
matrix[1][0] = 1; // Grn
matrix[2][0] = 1; // Blu
break;
case 2:
default:
matrix = new float[4][2];
matrix[0][0] = 1; // Red
matrix[1][0] = 1; // Grn
matrix[3][0] = 1; // Blu
matrix[4][1] = 1; // Alpha
break;
}
Raster srcRas = src.getData(wr.getBounds());
BandCombineOp op = new BandCombineOp(matrix, null);
op.filter(srcRas, wr);
} catch (Throwable t) {
t.printStackTrace();
}
return wr;
}
ColorModel dstCM = getColorModel();
if (srcCM.getColorSpace() == dstCM.getColorSpace()) {
// No transform needed, just reformat data...
// System.out.println("Bypassing");
if (is_INT_PACK_COMP(srcSM)) {
src.copyData(wr);
} else {
GraphicsUtil.copyData(src.getData(wr.getBounds()), wr);
}
return wr;
}
Raster srcRas = src.getData(wr.getBounds());
assert srcRas instanceof WritableRaster;
WritableRaster srcWr = (WritableRaster)srcRas;
// 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;
if (srcCM.hasAlpha()) {
srcBICM = GraphicsUtil.coerceData(srcWr, srcCM, false);
}
BufferedImage srcBI;
BufferedImage dstBI;
srcBI = new BufferedImage(srcBICM,
srcWr.createWritableTranslatedChild(0, 0),
false,
null);
// System.out.println("src: " + srcBI.getWidth() + "x" +
// srcBI.getHeight());
ColorConvertOp op = new ColorConvertOp(dstCM.getColorSpace(),
null);
dstBI = op.filter(srcBI, null);
// System.out.println("After filter:");
WritableRaster wr00 = wr.createWritableTranslatedChild(0, 0);
for (int i = 0; i < dstCM.getColorSpace().getNumComponents(); i++) {
copyBand(dstBI.getRaster(), i, wr00, i);
}
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.sRGB_Unpre;
}
return GraphicsUtil.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.sRGB;
case 2:
return GraphicsUtil.sRGB_Unpre;
case 3:
return GraphicsUtil.sRGB;
default:
return GraphicsUtil.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});
}
}
}