Adapt to changes in Argeo TP

[gpl/argeo-suite.git] / swt / org.argeo.app.swt / src / org / argeo / app / swt / osgi / BundleSvgTheme.java

diff --git a/swt/org.argeo.app.swt/src/org/argeo/app/swt/osgi/BundleSvgTheme.java b/swt/org.argeo.app.swt/src/org/argeo/app/swt/osgi/BundleSvgTheme.java
new file mode 100644 (file)
index 0000000..15a18ae
--- /dev/null
+++ b/swt/org.argeo.app.swt/src/org/argeo/app/swt/osgi/BundleSvgTheme.java
@@ -0,0 +1,131 @@
+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);
+//     }
+
+}