EPSWriter.java

//
// EPSWriter.java
//

/*
OME Bio-Formats package for reading and converting biological file formats.
Copyright (C) 2005-@year@ UW-Madison LOCI and Glencoe Software, Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package loci.formats.out;

import java.io.IOException;

import loci.formats.FormatException;
import loci.formats.FormatTools;
import loci.formats.FormatWriter;
import loci.formats.meta.MetadataRetrieve;

/**
 * EPSWriter is the file format writer for Encapsulated PostScript (EPS) files.
 *
 * <dl><dt><b>Source code:</b></dt>
 * <dd><a href="http://trac.openmicroscopy.org.uk/ome/browser/bioformats.git/components/bio-formats/src/loci/formats/out/EPSWriter.java">Trac</a>,
 * <a href="http://git.openmicroscopy.org/?p=bioformats.git;a=blob;f=components/bio-formats/src/loci/formats/out/EPSWriter.java;hb=HEAD">Gitweb</a></dd></dl>
 *
 * @author Melissa Linkert melissa at glencoesoftware.com
 */
public class EPSWriter extends FormatWriter {

  // -- Constants --

  private static final String DUMMY_PIXEL = "00";

  // -- Fields --

  private long planeOffset = 0;

  // -- Constructor --

  public EPSWriter() {
    super("Encapsulated PostScript", new String[] {"eps", "epsi"});
  }

  // -- IFormatWriter API methods --

  /**
   * @see loci.formats.IFormatWriter#saveBytes(int, byte[], int, int, int, int)
   */
  public void saveBytes(int no, byte[] buf, int x, int y, int w, int h)
    throws FormatException, IOException
  {
    checkParams(no, buf, x, y, w, h);

    MetadataRetrieve meta = getMetadataRetrieve();
    int sizeX = meta.getPixelsSizeX(series).getValue().intValue();
    int nChannels = getSamplesPerPixel();

    // write pixel data
    // for simplicity, write 80 char lines

    if (!initialized[series][no]) {
      initialized[series][no] = true;

      writeHeader();

      if (!isFullPlane(x, y, w, h)) {
        // write a dummy plane that will be overwritten in sections
        int planeSize = w * h * nChannels;
        for (int i=0; i<planeSize; i++) {
          out.writeBytes(DUMMY_PIXEL);
        }
      }
    }

    int planeSize = w * h;

    StringBuffer buffer = new StringBuffer();

    int offset = y * sizeX * nChannels * 2;
    out.seek(planeOffset + offset);
    for (int row=0; row<h; row++) {
      out.skipBytes(nChannels * x * 2);
      for (int col=0; col<w*nChannels; col++) {
        int i = row * w * nChannels + col;
        int index = interleaved || nChannels == 1 ? i :
          (i % nChannels) * planeSize + (i / nChannels);
        String s = Integer.toHexString(buf[index]);
        // only want last 2 characters of s
        if (s.length() > 1) buffer.append(s.substring(s.length() - 2));
        else {
          buffer.append("0");
          buffer.append(s);
        }
      }
      out.writeBytes(buffer.toString());
      buffer.delete(0, buffer.length());
      out.skipBytes(nChannels * (sizeX - w - x) * 2);
    }

    // write footer

    out.seek(out.length());
    out.writeBytes("\nshowpage\n");
  }

  /* @see loci.formats.IFormatWriter#getPixelTypes(String) */
  public int[] getPixelTypes(String codec) {
    return new int[] {FormatTools.UINT8};
  }

  // -- Helper methods --

  private void writeHeader() throws IOException {
    MetadataRetrieve r = getMetadataRetrieve();
    int width = r.getPixelsSizeX(series).getValue().intValue();
    int height = r.getPixelsSizeY(series).getValue().intValue();
    int nChannels = getSamplesPerPixel();

    out.writeBytes("%!PS-Adobe-2.0 EPSF-1.2\n");
    out.writeBytes("%%Title: " + currentId + "\n");
    out.writeBytes("%%Creator: LOCI Bio-Formats\n");
    out.writeBytes("%%Pages: 1\n");
    out.writeBytes("%%BoundingBox: 0 0 " + width + " " + height + "\n");
    out.writeBytes("%%EndComments\n\n");

    out.writeBytes("/ld {load def} bind def\n");
    out.writeBytes("/s /stroke ld /f /fill ld /m /moveto ld /l " +
      "/lineto ld /c /curveto ld /rgb {255 div 3 1 roll 255 div 3 1 " +
      "roll 255 div 3 1 roll setrgbcolor} def\n");
    out.writeBytes("0 0 translate\n");
    out.writeBytes(((float) width) + " " + ((float) height) + " scale\n");
    out.writeBytes("/picstr 40 string def\n");
    out.writeBytes(width + " " + height + " 8 [" + width + " 0 0 " +
      (-1 * height) + " 0 " + height +
      "] {currentfile picstr readhexstring pop} ");
    if (nChannels == 1) {
      out.writeBytes("image\n");
    }
    else {
      out.writeBytes("false 3 colorimage\n");
    }
    planeOffset = out.getFilePointer();
  }

}