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ApplyTransferFunction.java
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ApplyTransferFunction.java
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package mkl.testarea.pdfbox2.content;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.common.function.PDFunctionType4;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
import org.apache.pdfbox.pdmodel.graphics.state.PDExtendedGraphicsState;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceStream;
import org.apache.pdfbox.util.Matrix;
import org.junit.BeforeClass;
import org.junit.Test;
import com.google.common.io.ByteStreams;
/**
* @author mkl
*/
public class ApplyTransferFunction {
final static File RESULT_FOLDER = new File("target/test-outputs", "content");
@BeforeClass
public static void setUpBeforeClass() throws Exception {
RESULT_FOLDER.mkdirs();
}
/**
* <a href="https://stackoverflow.com/questions/65665511/pdfbox-tint-transformation-of-pdf-page-contents-colors">
* PDFBox tint transformation of PDF page contents (colors)
* </a>
* <p>
* This test shows how to apply transfer functions.
* </p>
*/
@Test
public void testSimpleTransferExample() throws IOException {
try (PDDocument pdDocument = new PDDocument()) {
PDPage pdPage = new PDPage();
pdDocument.addPage(pdPage);
PDImageXObject pdImage = null;
try (InputStream imageResource = getClass().getResourceAsStream("Willi-1.jpg")) {
pdImage = PDImageXObject.createFromByteArray(pdDocument, ByteStreams.toByteArray(imageResource), "Willi");
}
PDAppearanceStream pdFormXObject = new PDAppearanceStream(pdDocument);
pdFormXObject.setResources(new PDResources());
pdFormXObject.setBBox(new PDRectangle(150, 100));
try (PDPageContentStream canvas = new PDPageContentStream(pdDocument, pdFormXObject)) {
PDFont font = PDType1Font.HELVETICA;
canvas.setFont(font, 10);
canvas.beginText();
canvas.newLineAtOffset(10, 85);
canvas.setNonStrokingColor(1, 0, 0);
canvas.showText("red");
canvas.newLineAtOffset(0, -10);
canvas.setNonStrokingColor(0, 1, 0);
canvas.showText("green");
canvas.newLineAtOffset(0, -10);
canvas.setNonStrokingColor(0, 0, 1);
canvas.showText("blue");
canvas.newLineAtOffset(0, -10);
canvas.setNonStrokingColor(0);
canvas.showText("gray");
canvas.newLineAtOffset(0, -10);
canvas.setNonStrokingColor(1, 0, 0, 0);
canvas.showText("cyan");
canvas.newLineAtOffset(0, -10);
canvas.setNonStrokingColor(0, 1, 0, 0);
canvas.showText("magenta");
canvas.newLineAtOffset(0, -10);
canvas.setNonStrokingColor(0, 0, 1, 0);
canvas.showText("yellow");
canvas.newLineAtOffset(0, -10);
canvas.setNonStrokingColor(0, 0, 0, 1);
canvas.showText("black");
canvas.endText();
}
try (PDPageContentStream canvas = new PDPageContentStream(pdDocument, pdPage)) {
canvas.drawImage(pdImage, 0, 600, 150, 150);
drawForm(canvas, pdFormXObject, 0, 500);
canvas.setGraphicsStateParameters(createTransferedState("{ neg 1 add }"));
canvas.drawImage(pdImage, 150, 600, 150, 150);
drawForm(canvas, pdFormXObject, 150, 500);
canvas.setGraphicsStateParameters(createTransferedState("{ 90 mul cos }"));
canvas.drawImage(pdImage, 300, 600, 150, 150);
drawForm(canvas, pdFormXObject, 300, 500);
canvas.setGraphicsStateParameters(createTransferedState("{ 90 mul sin neg 1 add }"));
canvas.drawImage(pdImage, 450, 600, 150, 150);
drawForm(canvas, pdFormXObject, 450, 500);
canvas.setGraphicsStateParameters(createTransferedState("{ .5 mul }"));
canvas.drawImage(pdImage, 0, 350, 150, 150);
drawForm(canvas, pdFormXObject, 0, 250);
canvas.setGraphicsStateParameters(createTransferedState("{ 90 mul cos neg 1 add }"));
canvas.drawImage(pdImage, 150, 350, 150, 150);
drawForm(canvas, pdFormXObject, 150, 250);
canvas.setGraphicsStateParameters(createTransferedState("{ 90 mul sin }"));
canvas.drawImage(pdImage, 300, 350, 150, 150);
drawForm(canvas, pdFormXObject, 300, 250);
canvas.setGraphicsStateParameters(createTransferedState("{ .5 mul .5 add }"));
canvas.drawImage(pdImage, 450, 350, 150, 150);
drawForm(canvas, pdFormXObject, 450, 250);
canvas.setGraphicsStateParameters(createTransferedState("{ }", "{ pop 1 }", "{ pop 1 }", "{ pop 1 }"));
canvas.drawImage(pdImage, 0, 100, 150, 150);
drawForm(canvas, pdFormXObject, 0, 0);
canvas.setGraphicsStateParameters(createTransferedState("{ pop 1 }", "{ }", "{ pop 1 }", "{ pop 1 }"));
canvas.drawImage(pdImage, 150, 100, 150, 150);
drawForm(canvas, pdFormXObject, 150, 0);
canvas.setGraphicsStateParameters(createTransferedState("{ pop 1 }", "{ pop 1 }", "{ }", "{ pop 1 }"));
canvas.drawImage(pdImage, 300, 100, 150, 150);
drawForm(canvas, pdFormXObject, 300, 0);
canvas.setGraphicsStateParameters(createTransferedState("{ pop 1 }", "{ pop 1 }", "{ pop 1 }", "{ }"));
canvas.drawImage(pdImage, 450, 100, 150, 150);
drawForm(canvas, pdFormXObject, 450, 0);
}
pdDocument.save(new File(RESULT_FOLDER, "SimpleTransferExample.pdf"));
}
}
void drawForm(PDPageContentStream canvas, PDFormXObject pdFormXObject, float x, float y) throws IOException {
canvas.saveGraphicsState();
canvas.transform(Matrix.getTranslateInstance(x, y));
canvas.drawForm(pdFormXObject);
canvas.restoreGraphicsState();
}
PDExtendedGraphicsState createTransferedState(String function) throws IOException {
PDExtendedGraphicsState transferedState = new PDExtendedGraphicsState();
transferedState.setTransfer(createTransferFunction(function).getCOSObject());
return transferedState;
}
PDExtendedGraphicsState createTransferedState(String function1, String function2, String function3, String function4) throws IOException {
COSArray array = new COSArray();
array.add(createTransferFunction(function1).getCOSObject());
array.add(createTransferFunction(function2).getCOSObject());
array.add(createTransferFunction(function3).getCOSObject());
array.add(createTransferFunction(function4).getCOSObject());
PDExtendedGraphicsState transferedState = new PDExtendedGraphicsState();
transferedState.setTransfer(array);
return transferedState;
}
PDFunctionType4 createTransferFunction(String function) throws IOException {
return createFunction(function, new float[] {0f, 1.0f}, new float[] {0f, 1.0f});
}
/** @see org.apache.pdfbox.pdmodel.common.function.TestPDFunctionType4 */
PDFunctionType4 createFunction(String function, float[] domain, float[] range) throws IOException {
COSStream stream = new COSStream();
stream.setInt("FunctionType", 4);
COSArray domainArray = new COSArray();
domainArray.setFloatArray(domain);
stream.setItem("Domain", domainArray);
COSArray rangeArray = new COSArray();
rangeArray.setFloatArray(range);
stream.setItem("Range", rangeArray);
try (OutputStream out = stream.createOutputStream())
{
byte[] data = function.getBytes(StandardCharsets.US_ASCII);
out.write(data, 0, data.length);
}
return new PDFunctionType4(stream);
}
}