bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/utils/VRamBufferedImage.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.scenegraph.utils;
  13
  14 import java.awt.Color;
  15 import java.awt.Graphics2D;
  16 import java.awt.Point;
  17 import java.awt.RenderingHints;
  18 import java.awt.Transparency;
  19 import java.awt.geom.AffineTransform;
  20 import java.awt.geom.Rectangle2D;
  21 import java.awt.image.VolatileImage;
  22
  23 import com.kitfox.svg.SVGDiagram;
  24 import com.kitfox.svg.SVGException;
  25
  26 /**
  27  * @author J-P Laine
  28  */
  29 public class VRamBufferedImage extends BufferedImage {
  30
  31     VolatileImage   buffer = null;
  32     AffineTransform previousTransform = null;
  33
  34     /**
  35      * @param original
  36      * @param imageBounds
  37      * @param referenceSize a reference size for the rasterized images or
  38      *        <code>null</code> to not specify one in which case a default
  39      *        resolution is used
  40      */
  41     public VRamBufferedImage(SVGDiagram original, Rectangle2D imageBounds, Point referenceSize) {
  42         super(original, imageBounds, referenceSize);
  43     }
  44
  45     @Override
  46     public synchronized void releaseRaster() {
  47         if (buffer != null) {
  48             buffer.flush();
  49             buffer = null;
  50         }
  51     }
  52
  53     @Override
  54     public void paint(Graphics2D g) {
  55         float margin = 5;
  56
  57         if(previousTransform == null || previousTransform.getScaleX() != g.getTransform().getScaleX() || previousTransform.getScaleY() != g.getTransform().getScaleY()) {
  58             buffer = null;
  59             previousTransform = (AffineTransform)g.getTransform().clone();
  60             int w = (int)((imageBounds.getWidth()+margin*2) * previousTransform.getScaleX());
  61             int h = (int)((imageBounds.getHeight()+margin*2) * previousTransform.getScaleY());
  62             if(w < 1) w = 1;
  63             if(h < 1) h = 1;
  64             buffer = g.getDeviceConfiguration().createCompatibleVolatileImage(w, h, Transparency.TRANSLUCENT);
  65
  66             // FIXME: render in a "while loop" specified in VolatileImage, this is not guaranteed to work.
  67             try {
  68                 Graphics2D b2g = (Graphics2D)buffer.getGraphics();
  69
  70                 b2g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
  71                 b2g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  72                 b2g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  73
  74                 b2g.setBackground(new Color(255,255,255,0));
  75                 b2g.clearRect(0, 0, w, h);
  76                 b2g.translate(margin, margin);
  77                 b2g.scale(previousTransform.getScaleX(), previousTransform.getScaleY());
  78                 b2g.translate(-imageBounds.getMinX(), -imageBounds.getMinY());
  79                 source.render(b2g);
  80             } catch (SVGException e) {
  81                 // TODO Auto-generated catch block
  82                 e.printStackTrace();
  83             }
  84         }
  85
  86         g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
  87         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
  88         g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
  89         g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
  90
  91         AffineTransform at = (AffineTransform)g.getTransform().clone();
  92         try {
  93             g.translate(imageBounds.getMinX(), imageBounds.getMinY());
  94             g.scale(1/previousTransform.getScaleX(), 1/previousTransform.getScaleY());
  95             g.translate(-margin, -margin);
  96
  97             g.drawImage(buffer, 0, 0, null);
  98         } finally {
  99             g.setTransform(at);
 100         }
 101     }
 102 }