/* Copyright (C) 2000  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.*;
import java.awt.image.WritableRaster;
import java.awt.image.Raster;
import java.awt.image.DataBuffer;
import java.awt.image.ColorModel;
import java.awt.image.ImageObserver;
import java.awt.image.BufferedImage;
import gnu.gcj.xlib.GC;
import gnu.gcj.xlib.XImage;
import gnu.gcj.xlib.Drawable;
import gnu.gcj.xlib.Window;
import gnu.gcj.xlib.Drawable;
import gnu.gcj.xlib.Visual;
import gnu.awt.j2d.DirectRasterGraphics;
import gnu.awt.j2d.MappedRaster;

public class XGraphics implements Cloneable, DirectRasterGraphics
{
  static class XRaster extends MappedRaster
  {
    XImage ximage;
    
    public XRaster(WritableRaster raster, XImage ximage, ColorModel cm)
    {
      super(raster, cm);
      this.ximage = ximage;
    }
  }
  
  GC context;
  XGraphicsConfiguration config;
  Rectangle clipBounds;
    
  XFontMetrics metrics;


  public Object clone()
  {
    XGraphics gfxCopy = (XGraphics) super.clone();
    gfxCopy.context = context.create();
    
    return gfxCopy;
  }

  public void dispose()
  {
    GC lContext = context;
    context = null;
    config = null;
    clipBounds = null;
    
    if (lContext != null)
      {
	lContext.dispose();
      }	    
  }

  public XGraphics(Drawable drawable, XGraphicsConfiguration config)
  {
    context = new GC(drawable);
    this.config = config;
  }  
  
  public void setColor(Color color)
  {
    context.setForeground(config.getPixel(color));
  }

  public void setPaintMode()
  {
    throw new UnsupportedOperationException("not implemented");
  }

  public void setXORMode(Color c1)
  {
    throw new UnsupportedOperationException("not implemented");
  }
    
  public void setFont(Font font)
  {
    if ((metrics != null) && font.equals(metrics.getFont())) return;

    metrics = config.getXFontMetrics(font);
    context.setFont(metrics.xfont);
  }
    
  public FontMetrics getFontMetrics(Font font)
  {
    if ((metrics != null) && font.equals(metrics.getFont()))
      return metrics;
    
    return config.getXFontMetrics(font);
  }
    
  public void setClip(int x, int y, int width, int height)
  {
    Rectangle[] rects = { new Rectangle(x, y, width, height) };
    context.setClipRectangles(rects);
  }
    
  public void setClip(Shape clip)
  {
    /* TODO: create a special RectangleUnion shape that can be
       used to draw advantage of the GCs ability to set multiple
       rectangles. 
    */

    /* FIXME: creating all these objects is wasteful and can be
       costly in the long run, since this code is run at every
       expose. */
    Rectangle newClipBounds = clip.getBounds();
    
    if ((clipBounds != null) && !clipBounds.contains(newClipBounds))
      {
	System.err.println("warning: old clip ("+ clipBounds +") does " +
			   "not fully contain new clip (" +
			   newClipBounds + ")");
      }
    clipBounds = newClipBounds;
    Rectangle[] rects = { clipBounds };
    context.setClipRectangles(rects);
  }
    
  public void copyArea(int x, int y, int width, int height, int
		       dx, int dy)
  {
    throw new UnsupportedOperationException("not implemented");
  }
    
  public void drawLine(int x1, int y1, int x2, int y2)
  {
    context.drawLine(x1, y1, x2, y2);
  }
    
  public void drawRect(int x, int y, int width, int height)
  {
    throw new UnsupportedOperationException("not implemented yet");
  }
    
  public void fillRect(int x, int y, int width, int height)
  {
    context.fillRectangle(x, y, width, height);
  }
    
  public void drawArc(int x, int y, int width, int height, int
		      startAngle, int arcAngle)
  {
    throw new UnsupportedOperationException("not implemented");
  }
    
  public void fillArc(int x, int y, int width, int height, int
		      startAngle, int arcAngle)
  {
    throw new UnsupportedOperationException("not implemented");
  }
    
  public void drawPolyline(int[] xPoints, int[] yPoints, int
			   nPoints)
  {
    throw new UnsupportedOperationException("not implemented");
  }
    
  public void drawPolygon(int[] xPoints, int[] yPoints, int
			  nPoints)
  {
    throw new UnsupportedOperationException("not implemented");
  }
    
  public void fillPolygon(int[] xPoints, int[] yPoints, int
			  nPoints)
  {
    throw new UnsupportedOperationException("not implemented");
  }

  public void drawString(String str, int x, int y)
  {
    context.drawString(str, x, y);
  }

  public boolean drawImage(Image img, int x, int y,
			   ImageObserver observer)
  {
    if (clipBounds == null)
      return false; // ***FIXME***

    if (!(img instanceof BufferedImage))
      {
	throw new AWTError("unknown image class");
      }
	
    BufferedImage bimg = (BufferedImage) img;

    XImage ximg = (XImage) bimg.getProperty("gnu.gcj.xlib.XImage");
    if (ximg == null)
      {
	System.err.println("FIXME: skipping null XImage, should " +
			   "really do on the spot conversion");
	return false;
      }

    /*
      +------------------
      |    clip
      |     +---------+
      | img |         |
      |  +--+-------+ |
      |  |  |       | | 
      |  |  |       | |
      |  |  +-------+-+
      |  |          |
      |  +----------+
    */

    int iLeft   = Math.max(x, clipBounds.x);
    int iTop    = Math.max(y, clipBounds.y);
    int iRight  = Math.min(x + bimg.getWidth(),
			   clipBounds.x + clipBounds.width);
    int iBottom = Math.min(y + bimg.getHeight(),
			   clipBounds.y + clipBounds.height);
    
    int srcX = iLeft - x;
    int srcY = iTop  - y;
    
    int width  = iRight  - iLeft;
    int height = iBottom - iTop;
    
    if ((width > 0) && (height > 0))
      context.putImage(ximg, srcX, srcY, iLeft, iTop, width, height);

    return true;
  }

  public MappedRaster mapRaster(Rectangle bounds)
  {
    Visual visual = config.getVisual();
    XImage ximage = new XImage(visual, bounds.width, bounds.height,
			       false // do not auto allocate memory
			       );

    WritableRaster raster =
      config.createRasterForXImage(ximage,
				   new Point(bounds.x, bounds.y));
    
    DataBuffer dataB = raster.getDataBuffer();
    XGraphicsConfiguration.attachData(ximage, dataB, 0);

    Drawable drawable = context.getDrawable();

    // TODO: restrict to clipping

    Rectangle mBounds = drawable.copyIntoXImage(ximage, bounds, 0, 0);
	
    return new XRaster(raster, ximage, config.imageCM);
  }
    
    
  public void unmapRaster(MappedRaster mappedRaster)
  {
    XRaster xraster = (XRaster) mappedRaster;
    XImage ximage = xraster.ximage;
    Raster raster = xraster.getRaster();
    int x = raster.getMinX();
    int y = raster.getMinY();
    int width = raster.getWidth();
    int height = raster.getHeight();
    
    context.putImage(ximage, 0, 0, x, y, width, height);
  }
}