BMPEncoder.java 3.6 KB

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  1. /* BMPEncoder.java --
  2. Copyright (C) 2006 Free Software Foundation, Inc.
  3. This file is part of GNU Classpath.
  4. GNU Classpath is free software; you can redistribute it and/or modify
  5. it under the terms of the GNU General Public License as published by
  6. the Free Software Foundation; either version 2, or (at your option)
  7. any later version.
  8. GNU Classpath is distributed in the hope that it will be useful, but
  9. WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. General Public License for more details.
  12. You should have received a copy of the GNU General Public License
  13. along with GNU Classpath; see the file COPYING. If not, write to the
  14. Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  15. 02110-1301 USA.
  16. Linking this library statically or dynamically with other modules is
  17. making a combined work based on this library. Thus, the terms and
  18. conditions of the GNU General Public License cover the whole
  19. combination.
  20. As a special exception, the copyright holders of this library give you
  21. permission to link this library with independent modules to produce an
  22. executable, regardless of the license terms of these independent
  23. modules, and to copy and distribute the resulting executable under
  24. terms of your choice, provided that you also meet, for each linked
  25. independent module, the terms and conditions of the license of that
  26. module. An independent module is a module which is not derived from
  27. or based on this library. If you modify this library, you may extend
  28. this exception to your version of the library, but you are not
  29. obligated to do so. If you do not wish to do so, delete this
  30. exception statement from your version. */
  31. package gnu.javax.imageio.bmp;
  32. import java.io.IOException;
  33. import javax.imageio.IIOImage;
  34. import javax.imageio.ImageWriteParam;
  35. import javax.imageio.metadata.IIOMetadata;
  36. import javax.imageio.stream.ImageOutputStream;
  37. public abstract class BMPEncoder
  38. {
  39. /**
  40. * Constructs a new BMPEncoder.
  41. */
  42. public BMPEncoder()
  43. {
  44. // Nothing to do here.
  45. }
  46. /**
  47. * Determines the coding type of the bitmap and returns the corresponding
  48. * encoder.
  49. *
  50. * @param fh - the file header
  51. * @param ih - the info header
  52. * @return the appropriate encoder
  53. */
  54. public static BMPEncoder getEncoder(BMPFileHeader fh, BMPInfoHeader ih)
  55. {
  56. switch (ih.getCompression())
  57. {
  58. case BMPInfoHeader.BI_RGB:
  59. switch (ih.getBitCount())
  60. {
  61. case 32:
  62. return new EncodeRGB32(fh, ih);
  63. case 24:
  64. return new EncodeRGB24(fh, ih);
  65. case 16:
  66. return new EncodeRGB16(fh, ih);
  67. case 8:
  68. return new EncodeRGB8(fh, ih);
  69. case 4:
  70. return new EncodeRGB4(fh, ih);
  71. case 1:
  72. return new EncodeRGB1(fh, ih);
  73. default:
  74. return null;
  75. }
  76. case BMPInfoHeader.BI_RLE4:
  77. return new EncodeRLE4(fh, ih);
  78. case BMPInfoHeader.BI_RLE8:
  79. return new EncodeRLE8(fh, ih);
  80. default:
  81. return null;
  82. }
  83. }
  84. /**
  85. * The image encoder.
  86. *
  87. * @param o - the image output stream
  88. * @param streamMetadata - metadata associated with this stream, or
  89. * null
  90. * @param image - an IIOImage containing image data, metadata and
  91. * thumbnails to be written
  92. * @param param - image writing parameters, or null
  93. * @exception IOException if a write error occurs
  94. */
  95. public abstract void encode(ImageOutputStream o, IIOMetadata streamMetadata,
  96. IIOImage image, ImageWriteParam param)
  97. throws IOException;
  98. }