libjava/classpath/gnu/javax/imageio/bmp/BMPImageWriterSpi.java

   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 }