gcc/libjava/classpath/javax/imageio/plugins/bmp/BMPImageWriteParam.java

/* BMPImageWriteParam.java --
   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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permission to link this library with independent modules to produce an
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package javax.imageio.plugins.bmp;

import java.util.Locale;

import javax.imageio.ImageWriteParam;

/**
 * A class to encode images in the BMP format.
 * By default, the data layout is bottom-up, such that the pixels are stored in
 * bottom-up order.
 *
 * The compression scheme can be specified by using setCompressionType()
 * appropriate type string. The compression scheme specified will be honored
 * if it is compatible with the type of image being written. If the
 * compression scheme is not compatible with the type of image being written,
 * then an IOException will be thrown by the BMP image writer. If the
 * compression type is not set, then getCompressionType() will return null.
 * In this case the BMP image writer will select a compression type that
 * supports encoding of the given image without loss of the color resolution.
 *
 * The compression type strings and the image type each supports are:
 * Uncompressed RLE: BI_RGB, image type: <= 8-bits/sample.
 * 8-bit Run Length Encoding: BI_RLE8, image type: <= 8-bits/sample
 * 4-bit Run Length Encoding: BI_RLE4, image type: <= 4-bits/sample
 * Packed data: BI_BITFIELDS, image type: 16 or 32 bits/sample
 *
 * @author Lillian Angel (langel at redhat dot com)
 */
public class BMPImageWriteParam
    extends ImageWriteParam
{

  /**
   * This boolean is true if the data will be written in a topdown manner.
   */
  private boolean topDown;

  /**
   * Compression type strings.
   */
  String rgb = "BI_RGB";
  String rle8 = "BI_RLE8";
  String rle4 = "BI_RLE4";
  String bitfields = "BI_BITFIELDS";

  /**
   * Constants to represent image types.
   */
  static final int BI_RGB = 0;
  static final int BI_RLE8 = 1;
  static final int BI_RLE4 = 2;
  static final int BI_BITFIELDS = 3;

  /**
   * Constructs an <code>BMPImageWriteParam</code> object with default values
   * and a <code>null Locale</code>.
   */
  public BMPImageWriteParam()
  {
    this(null);
  }

  /**
   * Constructs a <code>BMPImageWriteParam</code> set to use a given
   * <code>Locale</code> and with default values for all parameters.
   *
   * @param locale - a <code>Locale</code> to be used to localize compression
   *          type names and quality descriptions, or <code>null</code>.
   */
  public BMPImageWriteParam(Locale locale)
  {
    super(locale);
    topDown = false;
    canWriteCompressed = true;

    compressionTypes = new String[4];
    compressionTypes[BI_RGB] = rgb;
    compressionTypes[BI_RLE8] = rle8;
    compressionTypes[BI_RLE4] = rle4;
    compressionTypes[BI_BITFIELDS] = bitfields;

    compressionType = compressionTypes[BI_RGB];
  }

  /**
   * If set, the data will be written out in a top-down manner, the first
   * scanline being written first.
   *
   * @param topDown - whether the data are written in top-down order.
   */
  public void setTopDown(boolean topDown)
  {
    this.topDown = topDown;
  }

  /**
   * Returns the value of the <code>topDown</code> parameter. The default is
   * false.
   *
   * @return whether the data are written in top-down order.
   */
  public boolean isTopDown()
  {
    return topDown;
  }
}