com.itextpdf.text.pdf.PdfDeviceNColor Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of itextpdf Show documentation
Show all versions of itextpdf Show documentation
iText, a free Java-PDF library
package com.itextpdf.text.pdf;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.error_messages.MessageLocalization;
import java.util.Arrays;
import java.util.Locale;
public class PdfDeviceNColor implements ICachedColorSpace, IPdfSpecialColorSpace {
PdfSpotColor[] spotColors;
ColorDetails[] colorantsDetails;
public PdfDeviceNColor(PdfSpotColor[] spotColors) {
this.spotColors = spotColors;
}
public int getNumberOfColorants() {
return spotColors.length;
}
public PdfSpotColor[] getSpotColors() {
return spotColors;
}
public ColorDetails[] getColorantDetails(PdfWriter writer) {
if (colorantsDetails == null) {
colorantsDetails = new ColorDetails[spotColors.length];
int i = 0;
for (PdfSpotColor spotColorant : spotColors) {
colorantsDetails[i] = writer.addSimple(spotColorant);
i++;
}
}
return colorantsDetails;
}
public PdfObject getPdfObject(PdfWriter writer) {
PdfArray array = new PdfArray(PdfName.DEVICEN);
PdfArray colorants = new PdfArray();
float[] colorantsRanges = new float[spotColors.length * 2];
PdfDictionary colorantsDict = new PdfDictionary();
String psFunFooter = "";
int numberOfColorants = spotColors.length;
float[][] CMYK = new float[4][numberOfColorants];
int i = 0;
for (; i < numberOfColorants; i++) {
PdfSpotColor spotColorant = spotColors[i];
colorantsRanges[2 * i] = 0;
colorantsRanges[2 * i + 1] = 1;
colorants.add(spotColorant.getName());
if (colorantsDict.get(spotColorant.getName()) != null)
throw new RuntimeException(MessageLocalization.getComposedMessage("devicen.component.names.shall.be.different"));
if (colorantsDetails != null)
colorantsDict.put(spotColorant.getName(), colorantsDetails[i].getIndirectReference());
else
colorantsDict.put(spotColorant.getName(), spotColorant.getPdfObject(writer));
BaseColor color = spotColorant.getAlternativeCS();
if (color instanceof ExtendedColor) {
int type = ((ExtendedColor)color).type;
switch (type) {
case ExtendedColor.TYPE_GRAY:
CMYK[0][i] = 0;
CMYK[1][i] = 0;
CMYK[2][i] = 0;
CMYK[3][i] = 1 - ((GrayColor)color).getGray();
break;
case ExtendedColor.TYPE_CMYK:
CMYK[0][i] = ((CMYKColor)color).getCyan();
CMYK[1][i] = ((CMYKColor)color).getMagenta();
CMYK[2][i] = ((CMYKColor)color).getYellow();
CMYK[3][i] = ((CMYKColor)color).getBlack();
break;
case ExtendedColor.TYPE_LAB:
CMYKColor cmyk = ((LabColor)color).toCmyk();
CMYK[0][i] = cmyk.getCyan();
CMYK[1][i] = cmyk.getMagenta();
CMYK[2][i] = cmyk.getYellow();
CMYK[3][i] = cmyk.getBlack();
break;
default:
throw new RuntimeException(MessageLocalization.getComposedMessage("only.rgb.gray.and.cmyk.are.supported.as.alternative.color.spaces"));
}
} else {
float r = color.getRed();
float g = color.getGreen();
float b = color.getBlue();
float computedC = 0, computedM = 0, computedY = 0, computedK = 0;
// BLACK
if (r==0 && g==0 && b==0) {
computedK = 1;
} else {
computedC = 1 - (r/255);
computedM = 1 - (g/255);
computedY = 1 - (b/255);
float minCMY = Math.min(computedC,
Math.min(computedM,computedY));
computedC = (computedC - minCMY) / (1 - minCMY) ;
computedM = (computedM - minCMY) / (1 - minCMY) ;
computedY = (computedY - minCMY) / (1 - minCMY) ;
computedK = minCMY;
}
CMYK[0][i] = computedC;
CMYK[1][i] = computedM;
CMYK[2][i] = computedY;
CMYK[3][i] = computedK;
}
psFunFooter += "pop ";
}
array.add(colorants);
String psFunHeader = String.format(Locale.US, "1.000000 %d 1 roll ", numberOfColorants + 1);
array.add(PdfName.DEVICECMYK);
psFunHeader = psFunHeader + psFunHeader + psFunHeader + psFunHeader;
String psFun = "";
i = numberOfColorants + 4;
for (; i > numberOfColorants; i--) {
psFun += String.format(Locale.US, "%d -1 roll ", i);
for (int j = numberOfColorants; j > 0; j--) {
psFun += String.format(Locale.US, "%d index %f mul 1.000000 cvr exch sub mul ", j, CMYK[numberOfColorants + 4 - i][numberOfColorants - j]);
}
psFun += String.format(Locale.US, "1.000000 cvr exch sub %d 1 roll ", i);
}
PdfFunction func = PdfFunction.type4(writer, colorantsRanges, new float[]{0, 1, 0, 1, 0, 1, 0, 1}, "{ " + psFunHeader + psFun + psFunFooter + "}");
array.add(func.getReference());
PdfDictionary attr = new PdfDictionary();
attr.put(PdfName.SUBTYPE, PdfName.NCHANNEL);
attr.put(PdfName.COLORANTS, colorantsDict);
array.add(attr);
return array;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof PdfDeviceNColor)) return false;
PdfDeviceNColor that = (PdfDeviceNColor) o;
if (!Arrays.equals(spotColors, that.spotColors)) return false;
return true;
}
@Override
public int hashCode() {
return Arrays.hashCode(spotColors);
}
}