gdkpixbufdecoder.java

gcc的组建

      }      
    throw new IllegalArgumentException("unknown extension '" + str + "'");
  }

  private static GdkPixbufReaderSpi readerSpi;
  private static GdkPixbufWriterSpi writerSpi;

  public static synchronized GdkPixbufReaderSpi getReaderSpi()
  {
    if (readerSpi == null)
      readerSpi = new GdkPixbufReaderSpi();
    return readerSpi;
  }

  public static synchronized GdkPixbufWriterSpi getWriterSpi()
  {
    if (writerSpi == null)
      writerSpi = new GdkPixbufWriterSpi();
    return writerSpi;
  }

  public static void registerSpis(IIORegistry reg) 
  {
    reg.registerServiceProvider(getReaderSpi(), ImageReaderSpi.class);
    reg.registerServiceProvider(getWriterSpi(), ImageWriterSpi.class);
  }

  public static class GdkPixbufWriterSpi extends ImageWriterSpi
  {
    public GdkPixbufWriterSpi() 
    {      
      super("GdkPixbuf", "2.x",
            GdkPixbufDecoder.getFormatNames(true), 
            GdkPixbufDecoder.getFormatExtensions(true), 
            GdkPixbufDecoder.getFormatMimeTypes(true),
            "gnu.java.awt.peer.gtk.GdkPixbufDecoder$GdkPixbufWriter",
            new Class[] { ImageOutputStream.class },
            new String[] { "gnu.java.awt.peer.gtk.GdkPixbufDecoder$GdkPixbufReaderSpi" },
            false, null, null, null, null,
            false, null, null, null, null);
    }

    public boolean canEncodeImage(ImageTypeSpecifier ts)
    {
      return true;
    }

    public ImageWriter createWriterInstance(Object ext)
    {
      return new GdkPixbufWriter(this, ext);
    }

    public String getDescription(java.util.Locale loc)
    {
      return "GdkPixbuf Writer SPI";
    }

  }

  public static class GdkPixbufReaderSpi extends ImageReaderSpi
  {
    public GdkPixbufReaderSpi() 
    { 
      super("GdkPixbuf", "2.x",
            GdkPixbufDecoder.getFormatNames(false), 
            GdkPixbufDecoder.getFormatExtensions(false), 
            GdkPixbufDecoder.getFormatMimeTypes(false),
            "gnu.java.awt.peer.gtk.GdkPixbufDecoder$GdkPixbufReader",
            new Class[] { ImageInputStream.class },
            new String[] { "gnu.java.awt.peer.gtk.GdkPixbufDecoder$GdkPixbufWriterSpi" },
            false, null, null, null, null,
            false, null, null, null, null);
    }

    public boolean canDecodeInput(Object obj) 
    { 
      return true; 
    }

    public ImageReader createReaderInstance(Object ext)
    {
      return new GdkPixbufReader(this, ext);
    }

    public String getDescription(Locale loc)
    {
      return "GdkPixbuf Reader SPI";
    }
  }

  private static class GdkPixbufWriter
    extends ImageWriter
  {
    String ext;
    public GdkPixbufWriter(GdkPixbufWriterSpi ownerSpi, Object ext)
    {
      super(ownerSpi);
      this.ext = findFormatName(ext, true);
    }

    public IIOMetadata convertImageMetadata (IIOMetadata inData,
                                             ImageTypeSpecifier imageType,
                                             ImageWriteParam param)
    {
      return null;
    }

    public IIOMetadata convertStreamMetadata (IIOMetadata inData,
                                              ImageWriteParam param)
    {
      return null;
    }

    public IIOMetadata getDefaultImageMetadata (ImageTypeSpecifier imageType, 
                                                ImageWriteParam param)
    {
      return null;
    }

    public IIOMetadata getDefaultStreamMetadata (ImageWriteParam param)
    {
      return null;
    }

  public void write (IIOMetadata streamMetadata, IIOImage i, ImageWriteParam param)
    throws IOException
    {
      RenderedImage image = i.getRenderedImage();
      Raster ras = image.getData();
      int width = ras.getWidth();
      int height = ras.getHeight();
      ColorModel model = image.getColorModel();
      int[] pixels = GdkGraphics2D.findSimpleIntegerArray (image.getColorModel(), ras);
      
      if (pixels == null)
        {
          BufferedImage img = new BufferedImage(width, height, 
                                                (model != null && model.hasAlpha() ? 
                                                 BufferedImage.TYPE_INT_ARGB
                                                 : BufferedImage.TYPE_INT_RGB));
          int[] pix = new int[4];
          for (int y = 0; y < height; ++y)
            for (int x = 0; x < width; ++x)
              img.setRGB(x, y, model.getRGB(ras.getPixel(x, y, pix)));
          pixels = GdkGraphics2D.findSimpleIntegerArray (img.getColorModel(), 
                                                         img.getRaster());
          model = img.getColorModel();
        }

      processImageStarted(1);
      streamImage(pixels, this.ext, width, height, model.hasAlpha(), 
                  (DataOutput) this.getOutput());
      processImageComplete();
    }    
  }

  private static class GdkPixbufReader 
    extends ImageReader
    implements ImageConsumer
  {
    // ImageConsumer parts
    GdkPixbufDecoder dec;
    BufferedImage bufferedImage;
    ColorModel defaultModel;
    int width;
    int height;
    String ext;
    
    public GdkPixbufReader(GdkPixbufReaderSpi ownerSpi, Object ext)
    {
      super(ownerSpi);
      this.ext = findFormatName(ext, false);
    }

    public GdkPixbufReader(GdkPixbufReaderSpi ownerSpi, Object ext, GdkPixbufDecoder d)
    {
      this(ownerSpi, ext);
      dec = d;
    }

    public void setDimensions(int w, int h)
    {
      processImageStarted(1);
      width = w;
      height = h;
    }
    
    public void setProperties(Hashtable props) {}

    public void setColorModel(ColorModel model) 
    {
      defaultModel = model;
    }

    public void setHints(int flags) {}

    public void setPixels(int x, int y, int w, int h, 
                          ColorModel model, byte[] pixels, 
                          int offset, int scansize)
    {
    }      

    public void setPixels(int x, int y, int w, int h, 
                          ColorModel model, int[] pixels, 
                          int offset, int scansize)
    {
      if (model == null)
        model = defaultModel;
      
      if (bufferedImage == null)
        {
          bufferedImage = new BufferedImage (width, height, (model != null && model.hasAlpha() ? 
                                                             BufferedImage.TYPE_INT_ARGB
                                                             : BufferedImage.TYPE_INT_RGB));
        }

      int pixels2[];
      if (model != null)
        {
          pixels2 = new int[pixels.length];
          for (int yy = 0; yy < h; yy++)
            for (int xx = 0; xx < w; xx++)
              {
                int i = yy * scansize + xx;
                pixels2[i] = model.getRGB (pixels[i]);
              }
        }
      else
        pixels2 = pixels;

      bufferedImage.setRGB (x, y, w, h, pixels2, offset, scansize);
      processImageProgress(y / (height == 0 ? 1 : height));
    }

    public void imageComplete(int status) 
    {
      processImageComplete();
    }

    public BufferedImage getBufferedImage()
    {
      if (bufferedImage == null && dec != null)
        dec.startProduction (this);
      return bufferedImage;
    }

    // ImageReader parts

    public int getNumImages(boolean allowSearch)
      throws IOException
    {
      return 1;
    }

    public IIOMetadata getImageMetadata(int i) 
    {
      return null;
    }

    public IIOMetadata getStreamMetadata()
      throws IOException
    {
      return null;
    }

    public Iterator getImageTypes(int imageIndex)
      throws IOException
    {
      BufferedImage img = getBufferedImage();
      Vector vec = new Vector();
      vec.add(new ImageTypeSpecifier(img));
      return vec.iterator();
    }
    
    public int getHeight(int imageIndex)
      throws IOException
    {
      return getBufferedImage().getHeight();
    }

    public int getWidth(int imageIndex)
      throws IOException
    {
      return getBufferedImage().getWidth();
    }

    public void setInput(Object input,
                         boolean seekForwardOnly,
                         boolean ignoreMetadata)
    {
      super.setInput(input, seekForwardOnly, ignoreMetadata);
      dec = new GdkPixbufDecoder((InputStream) getInput());
    }

    public BufferedImage read(int imageIndex, ImageReadParam param)
      throws IOException
    {
      return getBufferedImage ();
    }
  }

  // remaining helper class and static method is a convenience for the Gtk
  // peers, for loading a BufferedImage in off a disk file without going
  // through the whole imageio system. 

  public static BufferedImage createBufferedImage (String filename)
  {
    GdkPixbufReader r = new GdkPixbufReader (getReaderSpi(), 
                                             "png", // reader auto-detects, doesn't matter
                                             new GdkPixbufDecoder (filename));
    return r.getBufferedImage ();
  }

  public static BufferedImage createBufferedImage (URL u)
  {
    GdkPixbufReader r = new GdkPixbufReader (getReaderSpi(), 
                                             "png", // reader auto-detects, doesn't matter
                                             new GdkPixbufDecoder (u));
    return r.getBufferedImage ();
  }

  public static BufferedImage createBufferedImage (byte[] imagedata, int imageoffset,
                                                   int imagelength)
  {
    GdkPixbufReader r = new GdkPixbufReader (getReaderSpi(), 
                                             "png", // reader auto-detects, doesn't matter
                                             new GdkPixbufDecoder (imagedata,
                                                                   imageoffset,
                                                                   imagelength));
    return r.getBufferedImage ();
  }
  
  public static BufferedImage createBufferedImage (ImageProducer producer)
  {
    GdkPixbufReader r = new GdkPixbufReader (getReaderSpi(), "png" /* ignored */, null);
    producer.startProduction(r);
    return r.getBufferedImage ();
  }

}