bufferedimage.java

gcc的组建

/* BufferedImage.java --
   Copyright (C) 2000, 2002, 2003, 2004, 2005  Free Software Foundation

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
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
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
conditions of the GNU General Public License cover the whole
combination.

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
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package java.awt.image;

import gnu.java.awt.ComponentDataBlitOp;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.util.Hashtable;
import java.util.Vector;

/**
 * A buffered image always starts at coordinates (0, 0).
 *
 * The buffered image is not subdivided into multiple tiles. Instead,
 * the image consists of one large tile (0,0) with the width and
 * height of the image. This tile is always considered to be checked
 * out.
 * 
 * @author Rolf W. Rasmussen ([e-mail])
 */
public class BufferedImage extends Image
  implements WritableRenderedImage, Transparency
{
  public static final int TYPE_CUSTOM         =  0,
                          TYPE_INT_RGB        =  1,
                          TYPE_INT_ARGB       =  2,
                          TYPE_INT_ARGB_PRE   =  3,
                          TYPE_INT_BGR        =  4,
                          TYPE_3BYTE_BGR      =  5,
                          TYPE_4BYTE_ABGR     =  6,
                          TYPE_4BYTE_ABGR_PRE =  7,
                          TYPE_USHORT_565_RGB =  8,
                          TYPE_USHORT_555_RGB =  9,
                          TYPE_BYTE_GRAY      = 10,
                          TYPE_USHORT_GRAY    = 11,
                          TYPE_BYTE_BINARY    = 12,
                          TYPE_BYTE_INDEXED   = 13;
  
  static final int[] bits3 = { 8, 8, 8 };
  static final int[] bits4 = { 8, 8, 8 };
  static final int[] bits1byte = { 8 };
  static final int[] bits1ushort = { 16 };
  
  static final int[] masks_int = { 0x00ff0000,
				   0x0000ff00,
				   0x000000ff,
				   DataBuffer.TYPE_INT };
  static final int[] masks_565 = { 0xf800,
				   0x07e0,
				   0x001f,
				   DataBuffer.TYPE_USHORT};
  static final int[] masks_555 = { 0x7c00,
				   0x03e0,
				   0x001f,
				   DataBuffer.TYPE_USHORT};

  Vector observers;
  
  public BufferedImage(int w, int h, int type)
  {
    ColorModel cm = null;
    
    boolean alpha = false;
    boolean premultiplied = false;
    switch (type)
      {
      case TYPE_4BYTE_ABGR_PRE:
      case TYPE_INT_ARGB_PRE:
	premultiplied = true;
	// fall through
      case TYPE_INT_ARGB:
      case TYPE_4BYTE_ABGR:
	alpha = true;
      }
	
    ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
    switch (type)
      {
      case TYPE_INT_RGB:
      case TYPE_INT_ARGB:
      case TYPE_INT_ARGB_PRE:
      case TYPE_USHORT_565_RGB:
      case TYPE_USHORT_555_RGB:
	int[] masks = null;
	switch (type)
	  {
	  case TYPE_INT_RGB:
	  case TYPE_INT_ARGB:
	  case TYPE_INT_ARGB_PRE:
	    masks = masks_int;
	    break;
	  case TYPE_USHORT_565_RGB:
	    masks = masks_565;
	    break;
	  case TYPE_USHORT_555_RGB:
	    masks = masks_555;
	    break;
	  }
	
	cm = new DirectColorModel(cs,
				  32, // 32 bits in an int
				  masks[0], // r
				  masks[1], // g
				  masks[2], // b
				  alpha ? 0xff000000 : 0,
				  premultiplied,
				  masks[3] // data type
				  );
	break;
	
      case TYPE_INT_BGR:
	String msg =
	  "FIXME: Programmer is confused. Why (and how) does a " +
	  "TYPE_INT_BGR image use ComponentColorModel to store " +
	  "8-bit values? Is data type TYPE_INT or TYPE_BYTE. What " +
	  "is the difference between TYPE_INT_BGR and TYPE_3BYTE_BGR?";
	throw new UnsupportedOperationException(msg);
	
      case TYPE_3BYTE_BGR:
      case TYPE_4BYTE_ABGR:
      case TYPE_4BYTE_ABGR_PRE:
      case TYPE_BYTE_GRAY:
      case TYPE_USHORT_GRAY:
	int[] bits = null;
	int dataType = DataBuffer.TYPE_BYTE;
	switch (type) {
	case TYPE_3BYTE_BGR:
	  bits = bits3;
	  break;
	case TYPE_4BYTE_ABGR:
	case TYPE_4BYTE_ABGR_PRE:
	  bits = bits4;
	  break;
	case TYPE_BYTE_GRAY:
	  bits = bits1byte;
	  break;
	case TYPE_USHORT_GRAY:
	  bits = bits1ushort;
	  dataType = DataBuffer.TYPE_USHORT;
	  break;
	}
	cm = new ComponentColorModel(cs, bits, alpha, premultiplied,
				     alpha ?
				     Transparency.TRANSLUCENT:
				     Transparency.OPAQUE,
				     dataType);
	break;
      case TYPE_BYTE_BINARY:
	byte[] vals = { 0, (byte) 0xff };
	cm = new IndexColorModel(8, 2, vals, vals, vals);
	break;
      case TYPE_BYTE_INDEXED:
	String msg2 = "type not implemented yet";
	throw new UnsupportedOperationException(msg2);
	// FIXME: build color-cube and create color model
      }
    
    init(cm,
	 cm.createCompatibleWritableRaster(w, h),
	 premultiplied,
	 null, // no properties
	 type
	 );
  }

  public BufferedImage(int w, int h, int type,
		       IndexColorModel indexcolormodel)
  {
    if ((type != TYPE_BYTE_BINARY) && (type != TYPE_BYTE_INDEXED))
      throw new IllegalArgumentException("type must be binary or indexed");

    init(indexcolormodel,
	 indexcolormodel.createCompatibleWritableRaster(w, h),
	 false, // not premultiplied (guess)
	 null, // no properties
	 type);
  }

  public BufferedImage(ColorModel colormodel, 
		       WritableRaster writableraster,
		       boolean premultiplied,
		       Hashtable properties)
  {
    init(colormodel, writableraster, premultiplied, properties,
	 TYPE_CUSTOM);
    // TODO: perhaps try to identify type?
  }
 
  WritableRaster raster;
  ColorModel colorModel;
  Hashtable properties;
  boolean isPremultiplied;
  int type;
  
  private void init(ColorModel cm,
		    WritableRaster writableraster,
		    boolean premultiplied,
		    Hashtable properties,
		    int type)
  {
    raster = writableraster;
    colorModel = cm;
    this.properties = properties;
    isPremultiplied = premultiplied;
    this.type = type;
  }
    
  //public void addTileObserver(TileObserver tileobserver) {}
  
  public void coerceData(boolean premultiplied)
  {
    colorModel = colorModel.coerceData(raster, premultiplied);
  }

  public WritableRaster copyData(WritableRaster dest)
  {
    if (dest == null)
      dest = raster.createCompatibleWritableRaster(getMinX(), getMinY(),
                                                   getWidth(),getHeight());

    int x = dest.getMinX();
    int y = dest.getMinY();
    int w = dest.getWidth();
    int h = dest.getHeight();
    
    // create a src child that has the right bounds...
    WritableRaster src =
      raster.createWritableChild(x, y, w, h, x, y,
				 null  // same bands
				 );
    if (src.getSampleModel () instanceof ComponentSampleModel
        && dest.getSampleModel () instanceof ComponentSampleModel)
      // Refer to ComponentDataBlitOp for optimized data blitting:
      ComponentDataBlitOp.INSTANCE.filter(src, dest);
    else
      {
        // slower path
        int samples[] = src.getPixels (x, y, w, h, (int [])null);
        dest.setPixels (x, y, w, h, samples);
      }
    return dest;
  }

  public Graphics2D createGraphics()
  {
    GraphicsEnvironment env;
    env = GraphicsEnvironment.getLocalGraphicsEnvironment ();
    return env.createGraphics (this);
  }

  public void flush() {
  }
  
  public WritableRaster getAlphaRaster()
  {
    return colorModel.getAlphaRaster(raster);
  }
  
  public ColorModel getColorModel()
  {
    return colorModel;
  }
  
  public Raster getData()
  {
    return copyData(null);
    /* TODO: this might be optimized by returning the same
       raster (not writable) as long as image data doesn't change. */
  }

  public Raster getData(Rectangle rectangle)
  {
    WritableRaster dest =
      raster.createCompatibleWritableRaster(rectangle);
    return copyData(dest);
  }
  
  public Graphics getGraphics()
  {
    return createGraphics();
  }

  public int getHeight()
  {
    return raster.getHeight();
  }
  
  public int getHeight(ImageObserver imageobserver)
  {
    return getHeight();
  }
    
  public int getMinTileX()
  {
    return 0;
  }
  
  public int getMinTileY()
  {
    return 0;
  }

  public int getMinX()
  {
    return 0; 
  }

  public int getMinY() 
  {