001    /* RenderableImageOp.java -- 
002       Copyright (C) 2002 Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package java.awt.image.renderable;
040    
041    import java.awt.RenderingHints;
042    import java.awt.geom.AffineTransform;
043    import java.awt.image.RenderedImage;
044    import java.util.Vector;
045    
046    public class RenderableImageOp implements RenderableImage
047    {
048      private final ContextualRenderedImageFactory crif;
049      private ParameterBlock block;
050    
051      public RenderableImageOp(ContextualRenderedImageFactory crif,
052                               ParameterBlock block)
053      {
054        this.crif = crif;
055        this.block = (ParameterBlock) block.clone();
056      }
057    
058      public Vector<RenderableImage> getSources()
059      {
060        if (block.sources == null)
061          return null;
062        int size = block.sources.size();
063        Vector v = new Vector();
064        for (int i = 0; i < size; i++)
065          {
066            Object o = block.sources.get(i);
067            if (o instanceof RenderableImage)
068              v.add(o);
069          }
070        return v;
071      }
072    
073      public Object getProperty(String name)
074      {
075        return crif.getProperty(block, name);
076      }
077    
078      public String[] getPropertyNames()
079      {
080        return crif.getPropertyNames();
081      }
082    
083      public boolean isDynamic()
084      {
085        return crif.isDynamic();
086      }
087    
088      public float getWidth()
089      {
090        return (float) crif.getBounds2D(block).getWidth();
091      }
092    
093      public float getHeight()
094      {
095        return (float) crif.getBounds2D(block).getHeight();
096      }
097    
098      public float getMinX()
099      {
100        return (float) crif.getBounds2D(block).getX();
101      }
102    
103      public float getMinY()
104      {
105        return (float) crif.getBounds2D(block).getY();
106      }
107    
108      public ParameterBlock setParameterBlock(ParameterBlock block)
109      {
110        ParameterBlock result = this.block;
111        this.block = (ParameterBlock) block.clone();
112        return result;
113      }
114    
115      public ParameterBlock getParameterBlock()
116      {
117        return block;
118      }
119    
120      public RenderedImage createScaledRendering(int w, int h,
121                                                 RenderingHints hints)
122      {
123        if (w == 0)
124          if (h == 0)
125            throw new IllegalArgumentException();
126          else
127            w = Math.round(h * getWidth() / getHeight());
128        if (h == 0)
129          h = Math.round(w * getHeight() / getWidth());
130        AffineTransform xform = AffineTransform.getScaleInstance(w * getWidth(),
131                                                                 h * getHeight());
132        return createRendering(new RenderContext(xform, hints));
133      }
134    
135      public RenderedImage createDefaultRendering()
136      {
137        return createRendering(new RenderContext(new AffineTransform()));
138      }
139    
140      public RenderedImage createRendering(RenderContext context)
141      {
142        ParameterBlock copy = (ParameterBlock) block.clone();
143        int i = block.sources.size();
144        while (--i >= 0)
145          {
146            Object o = block.sources.get(i);
147            if (o instanceof RenderableImage)
148              {
149                RenderableImage ri = (RenderableImage) o;
150                RenderContext rc = crif.mapRenderContext(i, context, block, ri);
151                copy.sources.set(i, ri.createRendering(rc));
152              }
153          }
154        // Now copy.sources should be only RenderedImages.
155        return crif.create(context, copy);
156      }
157    } // class RenderableImageOp