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Escher is a collection of libraries for X Window System written purely in Java.

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package gnu.x11.image;

import gnu.x11.Colormap;
import gnu.x11.Display;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class PPM extends ZPixmap { // TODO
  public PPM (Display display, java.io.InputStream in) throws IOException {
    // WARNING: very naive parsing

    super (display);

    BufferedReader bin = new BufferedReader (new InputStreamReader (in));


    // format

    String format = bin.readLine ();
    if (!(format.equals ("P6")))
      throw new Error ("Unsupported format: " + format);


    // dimension

    String dimension = bin.readLine ();      
    int index = dimension.indexOf (' ');
    try {
      width = Integer.parseInt (dimension.substring (0, index));
      height = Integer.parseInt (dimension.substring (
        index+1, dimension.length ()));

    } catch (Exception e) {
      throw new Error ("Invalid dimension: " + dimension);
    }

    String color_count = bin.readLine ();


    // fill up data
    
    init ();
    Colormap cmap = display.default_colormap;   

    for (int y=0; y