+public class Picture {
+
+ public Picture() { this.stream = null; }
+ public Picture(JS r) { this.stream = r; }
+ private static Cache cache = new Cache(100); ///< Picture, keyed by the Stream that loaded them
+
+ public JS stream = null; ///< the stream we were loaded from
+ public int width = -1; ///< the width of the image
+ public int height = -1; ///< the height of the image
+ public int[] data = null; ///< argb samples
+ public boolean isLoaded = false; ///< true iff the image is fully loaded
+
+ /** invoked when an image is fully loaded; subclasses can use this to initialize platform-specific constructs */
+ protected void loaded() { isLoaded = true; }
+
+ /** turns a stream into a Picture.Source and passes it to the callback */
+ public static Picture load(final JS stream, final Scheduler.Task callback) {
+ Picture ret = (Picture)cache.get(stream);
+ if (ret == null) cache.put(stream, ret = Platform.createPicture(stream));
+ final Picture p = ret;
+ if (!ret.isLoaded && callback != null) {
+ final XWT.Blessing b = XWT.Blessing.getBlessing(stream);
+ new java.lang.Thread() { public void run() {
+ InputStream in = null;
+ try {
+ in = b == null ? Stream.getInputStream(stream) : b.getImage();
+ } catch (IOException e) { Log.error(Picture.class, stream);
+ } catch (JSExn e) { Log.error(Picture.class, stream);
+ }
+ if (in == null) { Log.warn(Picture.class, "couldn't load image for stream " + stream); return; }
+ try {
+ PushbackInputStream pbis = new PushbackInputStream(in);
+ int firstByte = pbis.read();
+ if (firstByte == -1) throw new JSExn("empty stream reading image");
+ pbis.unread(firstByte);
+ if ((firstByte & 0xff) == 'G') GIF.load(pbis, p);
+ else if ((firstByte & 0xff) == 137) PNG.load(pbis, p);
+ else if ((firstByte & 0xff) == 0xff) Platform.decodeJPEG(pbis, p);
+ else throw new JSExn("couldn't figure out image type from first byte");
+ p.loaded();
+ Scheduler.add(callback);
+ } catch (Exception e) {
+ Log.info(this, "exception while loading image");
+ Log.info(this, e);
+ }
+ } }.start();
+ }
+ return ret;
+ }