Examples of org.xhtmlrenderer.util.FSImageWriter

org.xhtmlrenderer.util.FSImageWriter
Writes out BufferedImages to some outputstream, like a file. Allows image writer parameters to be specified and thus controlled. Uses the java ImageIO libraries--see {@link javax.imageio.ImageIO} and related classes,especially {@link javax.imageio.ImageWriter}.
By default, FSImageWriter writes BufferedImages out in PNG format. The simplest possible usage is
```
 FSImageWriter writer = new FSImageWriter(); writer.write(img, new File("image.png")); 
```
You can set the image format in the constructore ( {@link org.xhtmlrenderer.util.FSImageWriter#FSImageWriter(String)}, and can set compression settings using various setters; this lets you create writer to reuse across a number of images, all output at the same compression level. Note that not all image formats support compression. For those that do, you may need to set more than one compression setting, in combination, for it to work. For JPG, it might look like this
```
 writer = new FSImageWriter("jpg"); writer.setWriteCompressionMode(ImageWriteParam.MODE_EXPLICIT); writer.setWriteCompressionType("JPEG"); writer.setWriteCompressionQuality(.75f); 
```
The method {@link #newJpegWriter(float)} creates a writer for JPG images; you just need to specify theoutput quality. Note that for the JPG format, your image or BufferedImage shouldn't be ARGB.

            BufferedImage img = j2d.getImage();


            // write it out, full size, PNG
            // FSImageWriter instance can be reused for different ../images,
            // defaults to PNG
            FSImageWriter imageWriter = new FSImageWriter();
            final File outputFile = new File(reference, page.getName() + ".png");
            outputFile.delete();
            String fileName = outputFile.getPath();
            imageWriter.write(img, fileName);
        } catch (Exception e) {
            System.err.println("Could not render input file to image, skipping: " + page + " err: " + e.getMessage());
            return;
        }
    }

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            BufferedImage img = j2d.getImage();


            // write it out, full size, PNG
            // FSImageWriter instance can be reused for different ../images,
            // defaults to PNG
            FSImageWriter imageWriter = new FSImageWriter();
            final File outputFile = new File(outputDir, page.getName() + ".png");
            if (outputFile.exists() && !outputFile.delete()) {
                throw new RuntimeException(
                        "On rendering image, could not delete new output file (.delete failed) " +
                                outputFile.getAbsolutePath()
                );
            }
            String fileName = outputFile.getPath();
            imageWriter.write(img, fileName);
        } catch (Exception e) {
            System.err.println("Could not render input file to image, skipping: " + page + " err: " + e.getMessage());
        }
    }

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            BufferedImage img = j2d.getImage();


            // write it out, full size, PNG
            // FSImageWriter instance can be reused for different ../images,
            // defaults to PNG
            FSImageWriter imageWriter = new FSImageWriter();
            final File outputFile = new File(outputDir, page.getName() + ".png");
            if (outputFile.exists() && !outputFile.delete()) {
                throw new RuntimeException(
                        "On rendering image, could not delete new output file (.delete failed) " +
                                outputFile.getAbsolutePath()
                );
            }
            String fileName = outputFile.getPath();
            imageWriter.write(img, fileName);
        } catch (Exception e) {
            System.err.println("Could not render input file to image, skipping: " + page + " err: " + e.getMessage());
        }
    }

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    File[] pngs = dir.listFiles(new FileFilter() {
      public boolean accept(File file) {
        return file.getName().endsWith(".png") && file.getName().indexOf("thumb") == - 1;
      }
    });
    FSImageWriter writer = new FSImageWriter("png");
    int width = 141;
    int height = 113;
    for (int i = 0; i < pngs.length; i++) {
      File png = pngs[i];
      try {
        String path = png.getAbsolutePath();
        String tpath = path.substring(0, path.indexOf(".png")) + "-thumb.png"; 
        BufferedImage bi = ImageIO.read(png);
        Image img = bi.getScaledInstance(width, height, Image.SCALE_FAST);
        bi = ImageUtil.convertToBufferedImage(img, BufferedImage.TYPE_4BYTE_ABGR);
        Graphics g = bi.getGraphics();
        writer.write(bi, tpath);
        System.out.println("Wrote: " + tpath);
      } catch (IOException e) {
        System.err.println("Can't read file, skipping: " + png.getName() + ", " + e.getMessage());
        continue;
      }

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   * @param width Width in pixels to which the document should be constrained.
   *
   * @throws java.io.IOException if the input URL, or output path location is invalid
   */
  public static BufferedImage renderToImage(String url, String path, int width) throws IOException {
    return renderImageToOutput(url, new FSImageWriter(), path, width);
  }

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   * @param height Height in pixels to which the document should be constrained.
   *
   * @throws java.io.IOException if the input URL, or output path location is invalid
   */
  public static BufferedImage renderToImage(String url, String path, int width, int height) throws IOException {
    return renderImageToOutput(url, new FSImageWriter(), path, width);
  }

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      if (f.exists()) {
        Java2DRenderer renderer = new Java2DRenderer(f, 1024);
        renderer.setBufferedImageType(BufferedImage.TYPE_INT_RGB);
        BufferedImage image = renderer.getImage();


        FSImageWriter imageWriter = new FSImageWriter();
        String path = f.getAbsolutePath();
        path = path.substring(0, path.lastIndexOf("."));
        imageWriter.write(image, path + ".png");


        // compare to old
        BufferedImage img = Graphics2DRenderer.renderToImageAutoSize(f.toURI().toURL().toExternalForm(), 1024, BufferedImage.TYPE_INT_ARGB);
        ImageIO.write(img, "png", new File(path + "-G2DR.png"));

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      }
      renderer.getSharedContext().setUserAgentCallback(agent);


      // Render the page to an image
      BufferedImage img = renderer.getImage();
      FSImageWriter imageWriter = new FSImageWriter(PREVIEW_FORMAT);
      imageFos = new FileOutputStream(imageFile);
      imageWriter.write(img, imageFos);


    } catch (IOException e) {
      logger.error("Error creating temporary copy of file content at " + xhtmlFile, e);
      throw e;
    } catch (XRRuntimeException e) {

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