/* QtImageConsumer.java --
   Copyright (C)  2005, 2006  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package gnu.java.awt.peer.qt;

import java.awt.image.ColorModel;
import java.awt.image.ImageConsumer;
import java.awt.image.ImageProducer;
import java.util.Hashtable;

/**
 * Helper class to QtImage. Sits and gathers pixels for a QtImage and then
 * calls QtImage.setImage().
 *
 * @author Sven de Marothy
 */
public class QtImageConsumer implements ImageConsumer
{
  private QtImage target;
  private int width, height;
  private Hashtable properties;
  private int[] pixelCache = null;
  private ImageProducer source;

  public QtImageConsumer(QtImage target, ImageProducer source)
  {
    this.target = target;
    this.source = source;
  }

  public synchronized void imageComplete (int status)
  {
    source.removeConsumer(this);
    target.setImage(width, height, pixelCache, properties);
  }

  public synchronized void setColorModel (ColorModel model)
  {
    // This method is to inform on what the most used color model
    // in the image is, for optimization reasons. We ignore this
    // information.
  }

  public synchronized void setDimensions (int width, int height)
  {
    pixelCache = new int[width*height];

    this.width = width;
    this.height = height;
  }

  public synchronized void setHints (int flags)
  {
    // This method informs us in which order the pixels are
    // delivered, for progressive-loading support, etc. 
    // Since we wait until it's all loaded, we can ignore the hints.
  }

  public synchronized void setPixels (int x, int y, int width, int height, 
				      ColorModel cm, byte[] pixels,
				      int offset, int scansize)
  {
    setPixels (x, y, width, height, cm, convertPixels (pixels), offset,
               scansize);
  }

  public synchronized void setPixels (int x, int y, int width, int height, 
				      ColorModel cm, int[] pixels,
				      int offset, int scansize)
  {
    if (pixelCache == null)
      return; // Not sure this should ever happen.

    if (cm.equals(QtImage.nativeModel))
      for (int i = 0; i < height; i++)
	System.arraycopy (pixels, offset + (i * scansize),
			  pixelCache, (y + i) * this.width + x,
			  width);
    else
      {
	for (int i = 0; i < height; i++)
	  for (int j = 0; j < width; j++)
	    {
	      // get in AARRGGBB and convert to AABBGGRR
	      int pix = cm.getRGB(pixels[offset + (i * scansize) + x + j]);
	      byte b = (byte)(pix & 0xFF);
	      byte r = (byte)(((pix & 0x00FF0000) >> 16) & 0xFF);
	      pix &= 0xFF00FF00;
	      pix |= ((b & 0xFF) << 16);
	      pix |= (r & 0xFF);
	      pixelCache[(y + i) * this.width + x + j] = pix;
	    }
      }
  }

  /**
   * This is an old method, no idea if it's correct.
   */
  private int[] convertPixels (byte[] pixels)
  {
    int ret[] = new int[pixels.length];

    for (int i = 0; i < pixels.length; i++)
      ret[i] = pixels[i] & 0xFF;
    
    return ret;
  }

  public synchronized void setProperties (Hashtable props)
  {
    this.properties = props;
  }
}