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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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.
*/
package org.apache.pdfbox.pdmodel.graphics.color;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.util.Matrix;
/**
* A CalRGB colour space is a CIE-based colour space with one transformation stage instead of two.
* In this type of space, A, B, and C represent calibrated red, green, and blue colour values.
*
* @author Ben Litchfield
* @author John Hewson
*/
public class PDCalRGB extends PDCIEDictionaryBasedColorSpace
{
private final PDColor initialColor = new PDColor(new float[] { 0, 0, 0 }, this);
/**
* Creates a new CalRGB color space.
*/
public PDCalRGB()
{
super(COSName.CALRGB);
}
/**
* Creates a new CalRGB color space using the given COS array.
* @param rgb the cos array which represents this color space
*/
public PDCalRGB(COSArray rgb)
{
super(rgb);
}
@Override
public String getName()
{
return COSName.CALRGB.getName();
}
@Override
public int getNumberOfComponents()
{
return 3;
}
@Override
public float[] getDefaultDecode(int bitsPerComponent)
{
return new float[] { 0, 1, 0, 1, 0, 1 };
}
@Override
public PDColor getInitialColor()
{
return initialColor;
}
@Override
public float[] toRGB(float[] value)
{
if (wpX == 1 && wpY == 1 && wpZ == 1)
{
float a = value[0];
float b = value[1];
float c = value[2];
PDGamma gamma = getGamma();
float powAR = (float)Math.pow(a, gamma.getR());
float powBG = (float)Math.pow(b, gamma.getG());
float powCB = (float)Math.pow(c, gamma.getB());
float[] matrix = getMatrix();
float mXA = matrix[0];
float mYA = matrix[1];
float mZA = matrix[2];
float mXB = matrix[3];
float mYB = matrix[4];
float mZB = matrix[5];
float mXC = matrix[6];
float mYC = matrix[7];
float mZC = matrix[8];
float x = mXA * powAR + mXB * powBG + mXC * powCB;
float y = mYA * powAR + mYB * powBG + mYC * powCB;
float z = mZA * powAR + mZB * powBG + mZC * powCB;
return convXYZtoRGB(x, y, z);
}
else
{
// this is a hack, we simply skip CIE calibration of the RGB value
// this works only with whitepoint D65 (0.9505 1.0 1.089)
// see PDFBOX-2553
return new float[] { value[0], value[1], value[2] };
}
}
/**
* Returns the gamma value.
* If none is present then the default of 1,1,1 will be returned.
* @return the gamma value
*/
public final PDGamma getGamma()
{
COSArray gammaArray = (COSArray) dictionary.getDictionaryObject(COSName.GAMMA);
if (gammaArray == null)
{
gammaArray = new COSArray();
gammaArray.add(new COSFloat(1.0f));
gammaArray.add(new COSFloat(1.0f));
gammaArray.add(new COSFloat(1.0f));
dictionary.setItem(COSName.GAMMA, gammaArray);
}
return new PDGamma(gammaArray);
}
/**
* Returns the linear interpretation matrix, which is an array of nine numbers.
* If the underlying dictionary contains null then the identity matrix will be returned.
* @return the linear interpretation matrix
*/
public final float[] getMatrix()
{
COSArray matrix = (COSArray)dictionary.getDictionaryObject(COSName.MATRIX);
if (matrix == null)
{
return new float[] { 1, 0, 0, 0, 1, 0, 0, 0, 1 };
}
else
{
return matrix.toFloatArray();
}
}
/**
* Sets the gamma value.
* @param gamma the new gamma value
*/
public final void setGamma(PDGamma gamma)
{
COSArray gammaArray = null;
if(gamma != null)
{
gammaArray = gamma.getCOSArray();
}
dictionary.setItem(COSName.GAMMA, gammaArray);
}
/**
* Sets the linear interpretation matrix.
* Passing in null will clear the matrix.
* @param matrix the new linear interpretation matrix, or null
*/
public final void setMatrix(Matrix matrix)
{
COSArray matrixArray = null;
if(matrix != null)
{
matrixArray = matrix.toCOSArray();
}
dictionary.setItem(COSName.MATRIX, matrixArray);
}
}