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PDF renderer implementation supporting the subset of PDF 1.4 specification.
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/*
* $Id: AlternateColorSpace.java,v 1.2 2007/12/20 18:33:34 rbair Exp $
*
* Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.sun.pdfview.colorspace;
import java.awt.color.ColorSpace;
import com.sun.pdfview.PDFPaint;
import com.sun.pdfview.function.PDFFunction;
/**
* A color space that uses another color space to return values, and a
* function to map between values in the input and input values to the
* alternate color space
*/
public class AlternateColorSpace extends PDFColorSpace {
/** The alternate color space */
private PDFColorSpace alternate;
/** The function */
private PDFFunction function;
/** Creates a new instance of AlternateColorSpace */
public AlternateColorSpace(PDFColorSpace alternate, PDFFunction function) {
super(null);
this.alternate = alternate;
this.function = function;
}
/**
* get the number of components expected in the getPaint command
*/
@Override public int getNumComponents() {
if (function != null) {
return function.getNumInputs();
} else {
return alternate.getNumComponents();
}
}
/**
* get the PDFPaint representing the color described by the
* given color components
* @param components the color components corresponding to the given
* colorspace
* @return a PDFPaint object representing the closest Color to the
* given components.
*/
@Override public PDFPaint getPaint(float[] components) {
if (function != null) {
// translate values using function
components = function.calculate(components);
}
return alternate.getPaint(components);
}
/**
* get the original Java ColorSpace.
*/
@Override public ColorSpace getColorSpace() {
return alternate.getColorSpace();
}
}