pixelgrabber.java

gcc的JAVA模块的源代码

    if ((consumerStatus & IMAGEABORTED) != 0)
      observerStatus |= ImageObserver.ABORT;

    if ((consumerStatus & STATICIMAGEDONE) != 0)
      {
	observerStatus |= ImageObserver.ALLBITS;
	retval = true;
      }

    if ((consumerStatus & SINGLEFRAMEDONE) != 0)
      {
	observerStatus |= ImageObserver.FRAMEBITS;
	retval = true;
      }

    return retval;
  }

  /**
   * @return the status of the pixel grabbing thread, represented by a
   * bitwise OR of ImageObserver flags
   */
  public synchronized int getStatus()
  {
    return observerStatus;
  }

  /**
   * @return the width of the grab rectangle in pixels, or a negative
   * number if the ImageProducer has not yet called our setDimensions
   * method
   */
  public synchronized int getWidth()
  {
    return width;
  }

  /**
   * @return the height of the grab rectangle in pixels, or a negative
   * number if the ImageProducer has not yet called our setDimensions
   * method
   */
  public synchronized int getHeight()
  {
    return height;
  }

  /**
   * @return a byte array of pixel data if ImageProducer delivered
   * pixel data using the byte[] variant of setPixels, or an int array
   * otherwise
   */
  public synchronized Object getPixels()
  {
    if (ints_delivered)
      return int_pixel_buffer;
    else if (bytes_delivered)
      return byte_pixel_buffer;
    else
      return null;
  }

  /**
   * @return the ColorModel currently being used for the majority of
   * pixel data conversions
   */
  public synchronized ColorModel getColorModel()
  {
    return model;
  }

  /**
   * Our <code>ImageProducer</code> calls this method to indicate the
   * size of the image being produced.
   *
   * setDimensions is an ImageConsumer method.  None of PixelGrabber's
   * ImageConsumer methods should be called by code that instantiates
   * a PixelGrabber.  They are only made public so they can be called
   * by the PixelGrabber's ImageProducer.
   * 
   * @param width the width of the image
   * @param height the height of the image
   */
  public synchronized void setDimensions(int width, int height)
  {
    // Our width wasn't set when we were constructed.  Set our width
    // so that the grab region includes all pixels from x to the right
    // edge of the source image.
    if (this.width < 0)
      this.width = width - x;

    // Our height wasn't set when we were constructed.  Set our height
    // so that the grab region includes all pixels from y to the
    // bottom edge of the source image.
    if (this.height < 0)
      this.height = height - y;

    if (scansize < 0)
      scansize = this.width;

    if (int_pixel_buffer == null)
      int_pixel_buffer = new int[this.width * this.height];

    if (byte_pixel_buffer == null)
      byte_pixel_buffer = new byte[this.width * this.height];
  }

  /**
   * Our <code>ImageProducer</code> may call this method to send us a
   * list of its image's properties.
   *
   * setProperties is an ImageConsumer method.  None of PixelGrabber's
   * ImageConsumer methods should be called by code that instantiates
   * a PixelGrabber.  They are only made public so they can be called
   * by the PixelGrabber's ImageProducer.
   *
   * @param props a list of properties associated with the image being
   * produced
   */
  public synchronized void setProperties(Hashtable props)
  {
    this.props = props;
  }

  /**
   * Our ImageProducer will call <code>setColorModel</code> to
   * indicate the model used by the majority of calls to
   * <code>setPixels</code>.  Each call to <code>setPixels</code>
   * could however indicate a different <code>ColorModel</code>.
   *
   * setColorModel is an ImageConsumer method.  None of PixelGrabber's
   * ImageConsumer methods should be called by code that instantiates
   * a PixelGrabber.  They are only made public so they can be called
   * by the PixelGrabber's ImageProducer.
   *
   * @param model the color model to be used most often by setPixels
   *
   * @see ColorModel
   */
  public synchronized void setColorModel(ColorModel model)
  {
    this.model = model;
  }

  /**
   * Our <code>ImageProducer</code> may call this method with a
   * bit mask of hints from any of <code>RANDOMPIXELORDER</code>,
   * <code>TOPDOWNLEFTRIGHT</code>, <code>COMPLETESCANLINES</code>,
   * <code>SINGLEPASS</code>, <code>SINGLEFRAME</code>.
   * 
   * setHints is an ImageConsumer method.  None of PixelGrabber's
   * ImageConsumer methods should be called by code that instantiates
   * a PixelGrabber.  They are only made public so they can be called
   * by the PixelGrabber's ImageProducer.
   *
   * @param flags a bit mask of hints
   */
  public synchronized void setHints(int flags)
  {
    hints = flags;
  }

  /**
   * Our ImageProducer calls setPixels to deliver a subset of its
   * pixels.
   *
   * Each element of the pixels array represents one pixel.  The
   * pixel data is formatted according to the color model model.
   * The x and y parameters are the coordinates of the rectangular
   * region of pixels being delivered to this ImageConsumer,
   * specified relative to the top left corner of the image being
   * produced.  Likewise, w and h are the pixel region's dimensions.
   *
   * @param x x coordinate of pixel block
   * @param y y coordinate of pixel block
   * @param w width of pixel block
   * @param h height of pixel block
   * @param model color model used to interpret pixel data
   * @param pixels pixel block data
   * @param offset offset into pixels array
   * @param scansize width of one row in the pixel block
   */
  public synchronized void setPixels(int x, int y, int w, int h, 
				     ColorModel model, byte[] pixels,
				     int offset, int scansize)
  {
    ColorModel currentModel;
    if (model != null)
      currentModel = model;
    else
      currentModel = this.model;

    for(int yp = y; yp < (y + h); yp++)
      {
	for(int xp = x; xp < (x + w); xp++)
	  {
	    // Check if the coordinates (xp, yp) are within the
	    // pixel block that we are grabbing.
	    if(xp >= this.x
	       && yp >= this.y
	       && xp < (this.x + this.width)
	       && yp < (this.y + this.height))
	      {
		int i = (yp - this.y) * this.scansize + (xp - this.x) + this.offset;
		int p = (yp - y) * scansize + (xp - x) + offset;
		if (forceRGB)
		  {
		    ints_delivered = true;

		    assert (i >= 0 && i < int_pixel_buffer.length);
		    assert (p >= 0 && p < pixels.length);
		    int_pixel_buffer[i] = currentModel.getRGB (pixels[p]);
		  }
		else
		  {
		    bytes_delivered = true;

		    assert (i >= 0 && i < byte_pixel_buffer.length);
		    assert (p >= 0 && p < pixels.length);
		    byte_pixel_buffer[i] = pixels[p];
		  }
	      }
	  }
      }
  }

  /**
   * Our ImageProducer calls setPixels to deliver a subset of its
   * pixels.
   *
   * Each element of the pixels array represents one pixel.  The
   * pixel data is formatted according to the color model model.
   * The x and y parameters are the coordinates of the rectangular
   * region of pixels being delivered to this ImageConsumer,
   * specified relative to the top left corner of the image being
   * produced.  Likewise, w and h are the pixel region's dimensions.
   *
   * @param x x coordinate of pixel block
   * @param y y coordinate of pixel block
   * @param w width of pixel block
   * @param h height of pixel block
   * @param model color model used to interpret pixel data
   * @param pixels pixel block data
   * @param offset offset into pixels array
   * @param scansize width of one row in the pixel block
   */
  public synchronized void setPixels(int x, int y, int w, int h, 
				     ColorModel model, int[] pixels,
				     int offset, int scansize)
  {
    ColorModel currentModel;
    if (model != null)
      currentModel = model;
    else
      currentModel = this.model;

    ints_delivered = true;

    for(int yp = y; yp < (y + h); yp++)
      {
	for(int xp = x; xp < (x + w); xp++)
	  {
	    // Check if the coordinates (xp, yp) are within the
	    // pixel block that we are grabbing.
	    if(xp >= this.x
	       && yp >= this.y
	       && xp < (this.x + this.width)
	       && yp < (this.y + this.height))
	      {
		int i = (yp - this.y) * this.scansize + (xp - this.x) + this.offset;
		int p = (yp - y) * scansize + (xp - x) + offset;
		assert (i >= 0 && i < int_pixel_buffer.length);
		assert (p >= 0 && p < pixels.length);
		if (forceRGB)
		  int_pixel_buffer[i] = currentModel.getRGB (pixels[p]);
		else
		  int_pixel_buffer[i] = pixels[p];
	      }
	  }
      }
  }

  /**
   * Our <code>ImageProducer</code> calls this method to inform us
   * that a single frame or the entire image is complete.  The method
   * is also used to inform us of an error in loading or producing the
   * image.
   *
   * @param status the status of image production, represented by a
   * bitwise OR of ImageConsumer flags
   */
  public synchronized void imageComplete(int status)
  {
    consumerStatus = status;
    setObserverStatus ();
    grabbing = false;
    ip.removeConsumer (this);

    notifyAll ();
  }

  /**
   * @return the return value of getStatus
   *
   * @specnote The newer getStatus should be used in place of status.
   */
  public synchronized int status()
  {
    return getStatus();
  }
}