source: trunk/src/gcc/libjava/gnu/awt/xlib/XGraphicsConfiguration.java@ 1392

/* Copyright (C) 2000, 2003  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package gnu.awt.xlib;

import java.awt.GraphicsConfiguration;
import java.awt.Rectangle;
import java.awt.Graphics2D;
import java.awt.Graphics;
import java.awt.GraphicsDevice;
import java.awt.Point;
import java.awt.Color;
import java.awt.color.ColorSpace;
import java.awt.image.*;
import java.awt.geom.AffineTransform;
import gnu.gcj.xlib.GC;
import gnu.gcj.xlib.Drawable;
import gnu.gcj.xlib.Window;
import gnu.gcj.xlib.XImage;
import gnu.gcj.xlib.Visual;
import gnu.gcj.xlib.Colormap;
import gnu.gcj.xlib.XColor;
import gnu.gcj.xlib.Screen;
import gnu.gcj.xlib.Display;
import gnu.java.awt.Buffers;
import java.util.Hashtable;

public class XGraphicsConfiguration extends GraphicsConfiguration
{
  //public abstract GraphicsDevice getDevice();
  
  Visual visual;
  int format;
  Colormap colormap;
  ColorModel imageCM;
  ColorModel pixelCM;
  
  public XGraphicsConfiguration(Visual visual)
  {
    this.visual = visual;
  }

  public BufferedImage createCompatibleImage(int width, int height)
  {
    XImage ximg = new XImage(visual, width, height,
                             false // do not auto allocate memory
                             );

    Point origin = new Point(0, 0);
    WritableRaster raster = createRasterForXImage(ximg, origin);

    /* This is not a good way of doing this. Multiple toolkits may
       want to share the BufferedImage. */
    Hashtable props = new Hashtable();
    props.put("gnu.gcj.xlib.XImage", ximg);
    props.put("java.awt.GraphicsConfiguration", this);
    
    BufferedImage bimg = new BufferedImage(imageCM,raster, false, props);

    DataBuffer dataB = raster.getDataBuffer();
    attachData(ximg, dataB, 0);
    return bimg;
  }

  WritableRaster createRasterForXImage(XImage ximage, Point origin)
  {
    if (imageCM == null) prepareColorModel(ximage);
    
    /*
      This will not work, since it creates a sample model that
      does not necessarily match the format of the XImage.
      
      WritableRaster raster =
      imageCM.createCompatibleWritableRaster(width, height); */
    
    // Create a sample model matching the XImage:

    SampleModel imageSM = null;

    int width = ximage.getWidth();
    int height = ximage.getHeight();
    int bitsPerPixel = ximage.getBitsPerPixel();
    int dataType =
      Buffers.smallestAppropriateTransferType(bitsPerPixel);
    int bitsPerDataElement = DataBuffer.getDataTypeSize(dataType);
    int scanlineStride = ximage.getBytesPerLine()*8/bitsPerDataElement;
    
    if (imageCM instanceof IndexColorModel)
      {
        int[] bandOffsets = {0};
        imageSM = new ComponentSampleModel(dataType,
                                           width, height,
                                           1, // pixel stride
                                           scanlineStride,
                                           bandOffsets);
      }
    else if (imageCM instanceof PackedColorModel)
      {
        PackedColorModel pcm = (PackedColorModel) imageCM;
        int[] masks = pcm.getMasks();
        
        imageSM = new SinglePixelPackedSampleModel(dataType,
                                                   width, height,
                                                   scanlineStride,
                                                   masks);
      }

    if (imageSM == null)
      {
        throw new UnsupportedOperationException("creating sample model " +
                                                "for " + imageCM +
                                                " not implemented");
      }

    WritableRaster raster = Raster.createWritableRaster(imageSM, origin);
    return raster;