bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/utils/BufferedImage.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.geom.AffineTransform;
  19 import java.awt.geom.Rectangle2D;
  20
  21 import com.kitfox.svg.SVGDiagram;
  22 import com.kitfox.svg.SVGException;
  23
  24 /**
  25  * @author J-P Laine
  26  */
  27 public class BufferedImage  {
  28     SVGDiagram                 source;
  29     Rectangle2D                imageBounds;
  30     Point                      referenceSize;
  31
  32     java.awt.image.BufferedImage   buffer = null;
  33     AffineTransform previousTransform = null;
  34
  35     /**
  36      * @param original
  37      * @param imageBounds
  38      * @param referenceSize a reference size for the rasterized images or
  39      *        <code>null</code> to not specify one in which case a default
  40      *        resolution is used
  41      */
  42     public BufferedImage(SVGDiagram original, Rectangle2D imageBounds, Point referenceSize) {
  43         this.source = original;
  44         this.imageBounds = imageBounds;
  45         this.referenceSize = referenceSize;
  46     }
  47
  48     public BufferedImage(SVGDiagram original) {
  49         this.source = original;
  50         this.imageBounds = original.getViewRect();
  51         this.referenceSize = null;
  52     }
  53
  54     public java.awt.image.BufferedImage getBuffer() {
  55         return buffer;
  56     }
  57
  58     @Override
  59     public void finalize() throws Throwable {
  60         //System.out.println("BufferedImage.finalize()");
  61         releaseRaster();
  62         super.finalize();
  63     }
  64
  65     public synchronized void releaseRaster() {
  66         source = null;
  67         if (buffer != null) {
  68             buffer.flush();
  69             buffer = null;
  70         }
  71     }
  72
  73     public void paintToBuffer(AffineTransform transform, float margin) throws SVGException {
  74
  75         int w = (int)((imageBounds.getWidth()+margin*2) * transform.getScaleX());
  76         int h = (int)((imageBounds.getHeight()+margin*2) * transform.getScaleY());
  77         if(w < 1) w = 1;
  78         if(h < 1) h = 1; // FIXME
  79
  80         buffer = new java.awt.image.BufferedImage(w, h, java.awt.image.BufferedImage.TYPE_INT_ARGB);
  81
  82         Graphics2D b2g = (Graphics2D)buffer.getGraphics();
  83
  84         b2g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
  85         b2g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  86         b2g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  87
  88         b2g.setBackground(Color.WHITE);
  89         b2g.clearRect(0, 0, w, h);
  90         b2g.translate(margin, margin);
  91         b2g.scale(transform.getScaleX(), transform.getScaleY());
  92         b2g.translate(-imageBounds.getMinX(), -imageBounds.getMinY());
  93         source.render(b2g);
  94
  95     }
  96
  97     public void paint(Graphics2D g) {
  98         float margin = 5;
  99
 100         if(previousTransform == null || previousTransform.getScaleX() != g.getTransform().getScaleX() || previousTransform.getScaleY() != g.getTransform().getScaleY()) {
 101 //              setupSourceRender(g);
 102             try {
 103                 previousTransform = (AffineTransform)g.getTransform().clone();
 104                 paintToBuffer(previousTransform, margin);
 105             } catch (SVGException e) {
 106                 // TODO Auto-generated catch block
 107                 e.printStackTrace();
 108             }
 109         }
 110
 111         g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
 112         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
 113         g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
 114         g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
 115
 116         AffineTransform at = (AffineTransform)g.getTransform().clone();
 117         try {
 118             g.translate(imageBounds.getMinX(), imageBounds.getMinY());
 119             g.scale(1/previousTransform.getScaleX(), 1/previousTransform.getScaleY());
 120             g.translate(-margin, -margin);
 121
 122             g.drawImage(buffer, 0, 0, null);
 123         } finally {
 124             g.setTransform(at);
 125         }
 126     }
 127 }