Source for gnu.javax.imageio.bmp.BMPImageWriterSpi

   1: /* BMPImageWriterSpi.java --
   2:    Copyright (C) 2006 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.javax.imageio.bmp;
  40: 
  41: import java.util.Locale;
  42: 
  43: import javax.imageio.ImageTypeSpecifier;
  44: import javax.imageio.ImageWriter;
  45: import javax.imageio.spi.ImageWriterSpi;
  46: 
  47: public class BMPImageWriterSpi
  48:     extends ImageWriterSpi
  49: {
  50: 
  51:   static final String vendorName = "GNU";
  52:   static final String version = "0.1";
  53:   static final String writerClassName = "gnu.javax.imageio.bmp.BMPImageWriter";
  54:   static final String[] names = { "bmp", "BMP", "Microsoft Windows BMP" };
  55:   static final String[] suffixes = { ".bmp", ".bm" };
  56:   static final String[] MIMETypes = { "image/bmp", "image/x-windows-bmp" };
  57:   static final String[] readerSpiNames = { "gnu.javax.imageio.bmp.BMPImageReaderSpi" };
  58: 
  59:   static final boolean supportsStandardStreamMetadataFormat = false;
  60:   static final String nativeStreamMetadataFormatName = null;
  61:   static final String nativeStreamMetadataFormatClassName = null;
  62:   static final String[] extraStreamMetadataFormatNames = null;
  63:   static final String[] extraStreamMetadataFormatClassNames = null;
  64:   static final boolean supportsStandardImageMetadataFormat = false;
  65:   static final String nativeImageMetadataFormatName = null;
  66:   static final String nativeImageMetadataFormatClassName = null;
  67:   static final String[] extraImageMetadataFormatNames = null;
  68:   static final String[] extraImageMetadataFormatClassNames = null;
  69: 
  70:   private BMPImageWriter writerInstance;
  71: 
  72:   public BMPImageWriterSpi()
  73:   {
  74:     super(vendorName, version, names, suffixes, MIMETypes, writerClassName,
  75:           STANDARD_OUTPUT_TYPE, readerSpiNames, supportsStandardStreamMetadataFormat,
  76:           nativeStreamMetadataFormatName, nativeStreamMetadataFormatClassName,
  77:           extraStreamMetadataFormatNames, extraStreamMetadataFormatClassNames,
  78:           supportsStandardImageMetadataFormat, nativeImageMetadataFormatName,
  79:           nativeImageMetadataFormatClassName, extraImageMetadataFormatNames,
  80:           extraImageMetadataFormatClassNames);
  81:   }
  82: 
  83:   /**
  84:    * Returns true if the image can be encoded.
  85:    *
  86:    * @param type - the image type specifier.
  87:    * @return true if image can be encoded, otherwise false.
  88:    */
  89:   public boolean canEncodeImage(ImageTypeSpecifier type)
  90:   {
  91:     if (type == null)
  92:       return false;
  93: 
  94:     BMPInfoHeader ih = writerInstance.infoHeader;
  95:     if (ih != null)
  96:       {
  97:         int compressionType = ih.getCompression();
  98:         int bytes = type.getColorModel().getPixelSize();
  99:         if ((compressionType == BMPInfoHeader.BI_RLE4 && (bytes != 4 || bytes != 8))
 100:             || (compressionType == BMPInfoHeader.BI_RGB && ((bytes != 1
 101:                                                              || bytes != 4
 102:                                                              || bytes != 8
 103:                                                              || bytes != 16
 104:                                                              || bytes != 24
 105:                                                              || bytes != 32))))
 106:           return false;
 107:       }
 108:     return true;
 109:   }
 110: 
 111:   /**
 112:    * Creates an instance of ImageWriter using the given extension.
 113:    *
 114:    * @param extension - the provider that is constructing this image writer, or
 115:    *          null
 116:    */
 117:   public ImageWriter createWriterInstance(Object extension)
 118:   {
 119:     if (extension != null && extension instanceof ImageWriterSpi)
 120:       writerInstance = new BMPImageWriter((ImageWriterSpi) extension);
 121:     else
 122:       writerInstance = new BMPImageWriter(this);
 123:     return writerInstance;
 124:   }
 125: 
 126:   /**
 127:    * Gets the instance of ImageWriter, if already created.
 128:    */
 129:   public BMPImageWriter getWriterInstance()
 130:   {
 131:     if (writerInstance != null)
 132:       return writerInstance;
 133:     return (BMPImageWriter) createWriterInstance(null);
 134:   }
 135: 
 136:   /**
 137:    * Returns a short description of this service provider that can be
 138:    * presented to a human user.
 139:    *
 140:    * @param locale - the locale for which the description string should
 141:    * be localized.
 142:    */
 143:   public String getDescription(Locale locale)
 144:   {
 145:     return "Microsoft BMP v3";
 146:   }
 147: 
 148: }