osgi/BundleSvgTheme.java

   1 package org.argeo.cms.swt.osgi;
   2
   3 import java.io.ByteArrayInputStream;
   4 import java.io.ByteArrayOutputStream;
   5 import java.io.IOException;
   6 import java.io.InputStream;
   7 import java.lang.System.Logger;
   8 import java.lang.System.Logger.Level;
   9 import java.util.Collections;
  10 import java.util.HashMap;
  11 import java.util.Map;
  12
  13 import org.apache.batik.transcoder.TranscoderException;
  14 import org.apache.batik.transcoder.TranscoderInput;
  15 import org.apache.batik.transcoder.TranscoderOutput;
  16 import org.apache.batik.transcoder.image.ImageTranscoder;
  17 import org.apache.batik.transcoder.image.PNGTranscoder;
  18 import org.eclipse.swt.graphics.Image;
  19 import org.eclipse.swt.graphics.ImageData;
  20 import org.eclipse.swt.widgets.Display;
  21 import org.osgi.framework.BundleContext;
  22
  23 /** Theme which can dynamically create icons from SVG data. */
  24 public class BundleSvgTheme extends BundleCmsSwtTheme {
  25         private final static Logger logger = System.getLogger(BundleSvgTheme.class.getName());
  26
  27         private Map<String, Map<Integer, Image>> imageCache = Collections.synchronizedMap(new HashMap<>());
  28
  29         private Map<Integer, ImageTranscoder> transcoders = Collections.synchronizedMap(new HashMap<>());
  30
  31         @Override
  32         public Image getIcon(String name, Integer preferredSize) {
  33                 String path = "icons/types/svg/" + name + ".svg";
  34                 return createImageFromSvg(path, preferredSize);
  35         }
  36
  37         protected Image createImageFromSvg(String path, Integer preferredSize) {
  38                 Image image = null;
  39                 if (imageCache.containsKey(path)) {
  40                         image = imageCache.get(path).get(preferredSize);
  41                 }
  42                 if (image != null)
  43                         return image;
  44                 ImageData imageData = loadFromSvg(path, preferredSize);
  45                 image = new Image(Display.getDefault(), imageData);
  46                 if (!imageCache.containsKey(path))
  47                         imageCache.put(path, Collections.synchronizedMap(new HashMap<>()));
  48                 imageCache.get(path).put(preferredSize, image);
  49                 return image;
  50         }
  51
  52         protected ImageData loadFromSvg(String path, int size) {
  53                 ImageTranscoder transcoder = null;
  54                 synchronized (this) {
  55                         transcoder = transcoders.get(size);
  56                         if (transcoder == null) {
  57                                 transcoder = new PNGTranscoder();
  58                                 transcoder.addTranscodingHint(PNGTranscoder.KEY_WIDTH, (float) size);
  59                                 transcoder.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, (float) size);
  60                                 transcoders.put(size, transcoder);
  61                         }
  62                 }
  63                 ImageData imageData;
  64                 try (InputStream in = getResourceAsStream(path); ByteArrayOutputStream out = new ByteArrayOutputStream();) {
  65                         if (in == null)
  66                                 throw new IllegalArgumentException(path + " not found");
  67                         TranscoderInput input = new TranscoderInput(in);
  68                         TranscoderOutput output = new TranscoderOutput(out);
  69                         transcoder.transcode(input, output);
  70                         try (InputStream imageIn = new ByteArrayInputStream(out.toByteArray())) {
  71                                 imageData = new ImageData(imageIn);
  72                         }
  73                         logger.log(Level.DEBUG, () -> "Generated " + size + "x" + size + " PNG icon from " + path);
  74                 } catch (IOException | TranscoderException e) {
  75                         throw new RuntimeException("Cannot transcode SVG " + path, e);
  76                 }
  77
  78                 return imageData;
  79         }
  80
  81         @Override
  82         public void init(BundleContext bundleContext, Map<String, String> properties) {
  83                 super.init(bundleContext, properties);
  84
  85                 // preload all icons
  86 //              paths: for (String p : getImagesPaths()) {
  87 //                      if (!p.endsWith(".svg"))
  88 //                              continue paths;
  89 //                      createImageFromSvg(p, getDefaultIconSize());
  90 //              }
  91         }
  92
  93         @Override
  94         public void destroy(BundleContext bundleContext, Map<String, String> properties) {
  95                 Display display = Display.getDefault();
  96                 if (display != null)
  97                         for (String path : imageCache.keySet()) {
  98                                 for (Image image : imageCache.get(path).values()) {
  99                                         display.syncExec(() -> image.dispose());
 100                                 }
 101                         }
 102                 super.destroy(bundleContext, properties);
 103         }
 104
 105 }