Example usage for org.apache.pdfbox.tools.imageio ImageIOUtil writeImage

Introduction

In this page you can find the example usage for org.apache.pdfbox.tools.imageio ImageIOUtil writeImage.

Prototype

public static boolean writeImage(BufferedImage image, String formatName, OutputStream output, int dpi,
        float compressionQuality) throws IOException 

Source Link

Document

Writes a buffered image to a file using the given image format.

Usage

From source file:ddf.catalog.transformer.input.pdf.PdfThumbnailGeneratorImpl.java

License:Open Source License

@Override
public Optional<byte[]> apply(PDDocument pdfDocument) throws IOException {
    PDFRenderer pdfRenderer = new PDFRenderer(pdfDocument);

    if (pdfDocument.getNumberOfPages() < 1) {
        return Optional.empty();
    }//from  w  w  w .  j a v a 2 s  .  co  m

    BufferedImage image = pdfRenderer.renderImageWithDPI(0, RESOLUTION_DPI, ImageType.RGB);

    int largestDimension = Math.max(image.getHeight(), image.getWidth());
    float scalingFactor = IMAGE_HEIGHTWIDTH / largestDimension;
    int scaledHeight = (int) (image.getHeight() * scalingFactor);
    int scaledWidth = (int) (image.getWidth() * scalingFactor);

    BufferedImage scaledImage = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_RGB);
    Graphics2D graphics = scaledImage.createGraphics();
    graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
    graphics.drawImage(image, 0, 0, scaledWidth, scaledHeight, null);
    graphics.dispose();

    try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
        ImageIOUtil.writeImage(scaledImage, FORMAT_NAME, outputStream, RESOLUTION_DPI, IMAGE_QUALITY);
        return Optional.of(outputStream.toByteArray());
    }
}

---

From source file:ddf.catalog.transformer.input.pptx.PptxInputTransformer.java

License:Open Source License

/**
 * If the slide show doesn't contain any slides, then return null. Otherwise, return jpeg
 * image data of the first slide in the deck.
 *
 * @param slideShow//  w  w  w  .  j  ava2 s . c  o m
 * @return jpeg thumbnail or null if thumbnail can't be created
 * @throws IOException
 */
private byte[] generatePptxThumbnail(XMLSlideShow slideShow) throws IOException {

    if (slideShow.getSlides().isEmpty()) {
        LOGGER.debug("the powerpoint file does not contain any slides, skipping thumbnail generation");
        return null;
    }

    Dimension pgsize = slideShow.getPageSize();

    int largestDimension = (int) Math.max(pgsize.getHeight(), pgsize.getWidth());
    float scalingFactor = IMAGE_HEIGHTWIDTH / largestDimension;
    int scaledHeight = (int) (pgsize.getHeight() * scalingFactor);
    int scaledWidth = (int) (pgsize.getWidth() * scalingFactor);
    BufferedImage img = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_RGB);

    Graphics2D graphics = img.createGraphics();

    try {
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
                RenderingHints.VALUE_FRACTIONALMETRICS_ON);

        graphics.scale(scalingFactor, scalingFactor);

        slideShow.getSlides().get(0).draw(graphics);

        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
            ImageIOUtil.writeImage(img, FORMAT_NAME, outputStream, RESOLUTION_DPI, IMAGE_QUALITY);
            return outputStream.toByteArray();
        }
    } catch (RuntimeException e) {
        if (e.getCause() instanceof javax.imageio.IIOException) {
            LOGGER.debug("unable to generate thumbnail for PPTX file", e);
        } else {
            throw e;
        }
    } finally {
        graphics.dispose();
    }

    return null;
}

---