/*
* 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;
import java.awt.color.ColorSpace;
import java.awt.color.ICC_ColorSpace;
import java.awt.color.ICC_Profile;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Map;
import com.sun.pdfview.PDFObject;
import com.sun.pdfview.PDFPaint;
import com.sun.pdfview.PDFParseException;
import com.sun.pdfview.function.PDFFunction;
/**
* A color space that can convert a set of color components into
* PDFPaint.
* @author Mike Wessler
*/
public class PDFColorSpace {
/** the name of the device-dependent gray color space */
public static final int COLORSPACE_GRAY = 0;
/** the name of the device-dependent RGB color space */
public static final int COLORSPACE_RGB = 1;
/** the name of the device-dependent CMYK color space */
public static final int COLORSPACE_CMYK = 2;
/** the name of the pattern color space */
public static final int COLORSPACE_PATTERN = 3;
/** the device-dependent color spaces */
// private static PDFColorSpace graySpace =
// new PDFColorSpace(ColorSpace.getInstance(ColorSpace.CS_GRAY));
private static PDFColorSpace rgbSpace = new PDFColorSpace(ColorSpace.getInstance(
ColorSpace.CS_sRGB));
private static PDFColorSpace cmykSpace = new PDFColorSpace(new CMYKColorSpace());
/** the pattern space */
private static PDFColorSpace patternSpace = new PatternSpace();
/** graySpace and the gamma correction for it. */
private static PDFColorSpace graySpace;
static {
boolean useSGray = true;
try {
graySpace = new PDFColorSpace((!useSGray)
? ColorSpace.getInstance(ColorSpace.CS_GRAY)
: new ICC_ColorSpace(ICC_Profile.getInstance(
PDFColorSpace.class.getResourceAsStream(
("sGray.icc")))));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/** the color space */
ColorSpace cs;
/**
* create a PDFColorSpace based on a Java ColorSpace
* @param cs the Java ColorSpace
*/
public PDFColorSpace(ColorSpace cs) {
this.cs = cs;
}
/**
* Get a color space by name
*
* @param name the name of one of the device-dependent color spaces
*/
public static PDFColorSpace getColorSpace(int name) {
switch (name) {
case COLORSPACE_GRAY:
return graySpace;
case COLORSPACE_RGB:
return rgbSpace;
case COLORSPACE_CMYK:
return cmykSpace;
case COLORSPACE_PATTERN:
return patternSpace;
default:
throw new IllegalArgumentException("Unknown Color Space name: " +
name);
}
}
/**
* Get a color space specified in a PDFObject
*
* @param csobj the PDFObject with the colorspace information
*/
public static PDFColorSpace getColorSpace(PDFObject csobj, Map resources)
throws IOException {
String name;
PDFObject colorSpaces = null;
if (resources != null) {
colorSpaces = (PDFObject) resources.get("ColorSpace");
}
if (csobj.getType() == PDFObject.NAME) {
name = csobj.getStringValue();
if (name.equals("DeviceGray") || name.equals("G")) {
return getColorSpace(COLORSPACE_GRAY);
} else if (name.equals("DeviceRGB") || name.equals("RGB")) {
return getColorSpace(COLORSPACE_RGB);
} else if (name.equals("DeviceCMYK") || name.equals("CMYK")) {
return getColorSpace(COLORSPACE_CMYK);
} else if (name.equals("Pattern")) {
return getColorSpace(COLORSPACE_PATTERN);
} else if (colorSpaces != null) {
csobj = colorSpaces.getDictRef(name);
}
}
if (csobj == null) {
return null;
} else if (csobj.getCache() != null) {
return (PDFColorSpace) csobj.getCache();
}
PDFColorSpace value = null;
// csobj is [/name <<dict>>]
PDFObject[] ary = csobj.getArray();
name = ary[0].getStringValue();
if (name.equals("DeviceGray") || name.equals("G")) {
return getColorSpace(COLORSPACE_GRAY);
} else if (name.equals("DeviceRGB") || name.equals("RGB")) {
return getColorSpace(COLORSPACE_RGB);
} else if (name.equals("DeviceCMYK") || name.equals("CMYK")) {
return getColorSpace(COLORSPACE_CMYK);
} else if (name.equals("CalGray")) {
value = new PDFColorSpace(new CalGrayColor(ary[1]));
} else if (name.equals("CalRGB")) {
value = new PDFColorSpace(new CalRGBColor(ary[1]));
} else if (name.equals("Lab")) {
value = new PDFColorSpace(new LabColor(ary[1]));
} else if (name.equals("ICCBased")) {
try {
ByteArrayInputStream bais = new ByteArrayInputStream(ary[1].getStream());
ICC_Profile profile = ICC_Profile.getInstance(bais);
value = new PDFColorSpace(new ICC_ColorSpace(profile));
} catch (IllegalArgumentException e) {
return getColorSpace(COLORSPACE_RGB);
}
} else if (name.equals("Separation") || name.equals("DeviceN")) {
PDFColorSpace alternate = getColorSpace(ary[2], resources);
PDFFunction function = PDFFunction.getFunction(ary[3]);
value = new AlternateColorSpace(alternate, function);
} else if (name.equals("Indexed") || name.equals("I")) {
/**
* 4.5.5 [/Indexed baseColor hival lookup]
*/
PDFColorSpace refspace = getColorSpace(ary[1], resources);
// number of indices= ary[2], data is in ary[3];
int count = ary[2].getIntValue();
try {
value = new IndexedColor(refspace, count, ary[3]);
}catch(Exception e) {
// there might be problems in reading the colorspace from stream,
// in that case use the reference colorspace
value = refspace;
}
} else if (name.equals("Pattern")) {
if (ary.length == 1) {
return getColorSpace(COLORSPACE_PATTERN);
}
PDFColorSpace base = getColorSpace(ary[1], resources);
return new PatternSpace(base);
} else if(name.equals("DeviceRGB")) {
return getColorSpace(COLORSPACE_RGB);
} else if(name.equals("DeviceCMYK")) {
return getColorSpace(COLORSPACE_CMYK);
} else {
// removed access to ary[1] dur to index out of bounds exceptions
throw new PDFParseException("Unknown color space: " + name);
}
csobj.setCache(value);
return value;
}
/**
* get the number of components expected in the getPaint command
*/
public int getNumComponents() {
return this.cs.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.
*/
public PDFPaint getPaint(float[] components) {
float[] rgb = this.cs.toRGB(components);
return PDFPaint.getColorPaint(new Color(rgb[0], rgb[1], rgb[2]));
}
/**
* get the original Java ColorSpace.
*/
public ColorSpace getColorSpace() {
return this.cs;
}
}