--- /dev/null
+package org.argeo.app.swt.osgi;
+
+import java.awt.Color;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.System.Logger;
+import java.lang.System.Logger.Level;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+import org.apache.batik.transcoder.TranscoderException;
+import org.apache.batik.transcoder.TranscoderInput;
+import org.apache.batik.transcoder.TranscoderOutput;
+import org.apache.batik.transcoder.image.ImageTranscoder;
+import org.apache.batik.transcoder.image.PNGTranscoder;
+import org.argeo.cms.swt.osgi.BundleCmsSwtTheme;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.widgets.Display;
+import org.osgi.framework.BundleContext;
+
+/** Theme which can dynamically create icons from SVG data. */
+public class BundleSvgTheme extends BundleCmsSwtTheme {
+ private final static Logger logger = System.getLogger(BundleSvgTheme.class.getName());
+
+ private Map<String, Map<Integer, ImageData>> imageDataCache = Collections.synchronizedMap(new HashMap<>());
+
+ private Map<Integer, ImageTranscoder> transcoders = Collections.synchronizedMap(new HashMap<>());
+
+ private final static String IMAGE_CACHE_KEY = BundleSvgTheme.class.getName() + ".imageCache";
+
+ @Override
+ public Image getIcon(String name, Integer preferredSize) {
+ String path = "icons/types/svg/" + name + ".svg";
+ return createImageFromSvg(path, preferredSize);
+ }
+
+ @SuppressWarnings("unchecked")
+ protected Image createImageFromSvg(String path, Integer preferredSize) {
+ Display display = Display.getCurrent();
+ Objects.requireNonNull(display, "Not a user interface thread");
+
+ Map<String, Map<Integer, Image>> imageCache = (Map<String, Map<Integer, Image>>) display
+ .getData(IMAGE_CACHE_KEY);
+ if (imageCache == null)
+ display.setData(IMAGE_CACHE_KEY, new HashMap<String, Map<Integer, Image>>());
+ imageCache = (Map<String, Map<Integer, Image>>) display.getData(IMAGE_CACHE_KEY);
+
+ Image image = null;
+ if (imageCache.containsKey(path)) {
+ image = imageCache.get(path).get(preferredSize);
+ }
+ if (image != null)
+ return image;
+ ImageData imageData = loadFromSvg(path, preferredSize);
+ image = new Image(display, imageData);
+ if (!imageCache.containsKey(path))
+ imageCache.put(path, Collections.synchronizedMap(new HashMap<>()));
+ imageCache.get(path).put(preferredSize, image);
+ return image;
+ }
+
+ protected ImageData loadFromSvg(String path, int size) {
+ ImageData imageData = null;
+ if (imageDataCache.containsKey(path))
+ imageData = imageDataCache.get(path).get(size);
+ if (imageData != null)
+ return imageData;
+
+ ImageTranscoder transcoder = null;
+ synchronized (this) {
+ transcoder = transcoders.get(size);
+ if (transcoder == null) {
+ transcoder = new PNGTranscoder();
+ transcoder.addTranscodingHint(PNGTranscoder.KEY_WIDTH, (float) size);
+ transcoder.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, (float) size);
+ transcoder.addTranscodingHint(PNGTranscoder.KEY_BACKGROUND_COLOR, new Color(255, 255, 255, 0));
+ transcoders.put(size, transcoder);
+ }
+ }
+ try (InputStream in = getResourceAsStream(path); ByteArrayOutputStream out = new ByteArrayOutputStream();) {
+ if (in == null)
+ throw new IllegalArgumentException(path + " not found");
+ TranscoderInput input = new TranscoderInput(in);
+ TranscoderOutput output = new TranscoderOutput(out);
+ transcoder.transcode(input, output);
+ try (InputStream imageIn = new ByteArrayInputStream(out.toByteArray())) {
+ imageData = new ImageData(imageIn);
+ }
+ logger.log(Level.DEBUG, () -> "Generated " + size + "x" + size + " PNG icon from " + path);
+ } catch (IOException | TranscoderException e) {
+ throw new RuntimeException("Cannot transcode SVG " + path, e);
+ }
+
+ // cache it
+ if (!imageDataCache.containsKey(path))
+ imageDataCache.put(path, Collections.synchronizedMap(new HashMap<>()));
+ imageDataCache.get(path).put(size, imageData);
+
+ return imageData;
+ }
+
+ @Override
+ public void init(BundleContext bundleContext, Map<String, String> properties) {
+ super.init(bundleContext, properties);
+
+ // preload all icons
+// paths: for (String p : getImagesPaths()) {
+// if (!p.endsWith(".svg"))
+// continue paths;
+// createImageFromSvg(p, getDefaultIconSize());
+// }
+ }
+
+// @Override
+// public void destroy(BundleContext bundleContext, Map<String, String> properties) {
+// Display display = Display.getDefault();
+// if (display != null)
+// for (String path : imageCache.keySet()) {
+// for (Image image : imageCache.get(path).values()) {
+// display.syncExec(() -> image.dispose());
+// }
+// }
+// super.destroy(bundleContext, properties);
+// }
+
+}