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

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