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feat: merge pdf into multiple frames if the format is TIFF #555

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merged 1 commit into from
Dec 25, 2023
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feat: merge pdf into multiple frames if the format is TIFF #555

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50 changes: 38 additions & 12 deletions src/main/java/stirling/software/SPDF/utils/PdfUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,11 @@
import java.util.zip.ZipOutputStream;

import javax.imageio.ImageIO;
import javax.imageio.IIOImage;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriter;
import javax.imageio.ImageWriteParam;
import javax.imageio.stream.ImageOutputStream;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
Expand Down Expand Up @@ -206,21 +210,43 @@ public static byte[] convertFromPdf(byte[] inputStream, String imageType, ImageT
images.add(pdfRenderer.renderImageWithDPI(i, DPI, colorType));
}

if (singleImage) {
// Combine all images into a single big image
BufferedImage combined = new BufferedImage(images.get(0).getWidth(), images.get(0).getHeight() * pageCount, BufferedImage.TYPE_INT_RGB);
Graphics g = combined.getGraphics();
for (int i = 0; i < images.size(); i++) {
g.drawImage(images.get(i), 0, i * images.get(0).getHeight(), null);
}
images = Arrays.asList(combined);
}

// Create a ByteArrayOutputStream to save the image(s) to
ByteArrayOutputStream baos = new ByteArrayOutputStream();

if (singleImage) {
// Write the image to the output stream
ImageIO.write(images.get(0), imageType, baos);
if (imageType.toLowerCase().equals("tiff") || imageType.toLowerCase().equals("tif")) {
// Write the images to the output stream as a TIFF with multiple frames
ImageWriter writer = ImageIO.getImageWritersByFormatName("tiff").next();
ImageWriteParam param = writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionType("ZLib");
param.setCompressionQuality(1.0f);

try (ImageOutputStream ios = ImageIO.createImageOutputStream(baos)) {
writer.setOutput(ios);
writer.prepareWriteSequence(null);

for (int i = 0; i < images.size(); ++i) {
BufferedImage image = images.get(i);
writer.writeToSequence(new IIOImage(image, null, null), param);
}

writer.endWriteSequence();
}

writer.dispose();
} else {
// Combine all images into a single big image
BufferedImage combined = new BufferedImage(images.get(0).getWidth(), images.get(0).getHeight() * pageCount, BufferedImage.TYPE_INT_RGB);
Graphics g = combined.getGraphics();

for (int i = 0; i < images.size(); i++) {
g.drawImage(images.get(i), 0, i * images.get(0).getHeight(), null);
}

// Write the image to the output stream
ImageIO.write(combined, imageType, baos);
}

// Log that the image was successfully written to the byte array
logger.info("Image successfully written to byte array");
Expand Down