import org.xwt.translators.*;
/**
- * <p>
* The in-memory representation of a PNG or GIF image. It is
* read-only. It is usually passed to PixelBuffer.drawPicture()
- * </p>
*
- * <p>
* Implementations of the Platform class should return objects
* supporting this interface from the createPicture() method. These
* implementations may choose to implement caching strategies (for
* example, using a Pixmap on X11).
- * </p>
*/
-public abstract class Picture {
+public class Picture {
- /** the resource that created this Picture */
- public Res res = null;
+ public Picture() { this.res = null; }
+ public Picture(Res r) { this.res = r; }
+ private static Cache cache = new Cache(100); ///< Picture, keyed by the Res that loaded them
- /** the height of the picture */
- public abstract int getHeight();
+ public Res res = null; ///< the resource 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
- /** the width of the picture */
- public abstract int getWidth();
-
- /** Pictures, cache keyed by Res instance */
- private static Cache cache = new Cache(100);
- private static GIF gif = new GIF();
-
- public static class Holder {
- public Picture picture = null;
- }
-
/** turns a resource into a Picture.Source and passes it to the callback */
- public static Holder fromRes(final Res r, final Scheduler.Task callback) {
- Holder ret = (Holder)cache.get(r);
- if (ret == null) {
- ret = new Holder();
- cache.put(r, ret);
- if (callback == null) return null;
- }
- final Holder holder = ret;
- if (callback != null)
+ public static Picture load(final Res r, final Scheduler.Task callback) {
+ Picture ret = (Picture)cache.get(r);
+ if (ret == null) cache.put(r, ret = Platform.createPicture(r));
+ final Picture p = ret;
+ if (!ret.isLoaded && callback != null)
new java.lang.Thread() { public void run() {
+ // get the InputStream for the image
+ InputStream in = null;
try {
- final byte[] b = InputStreamToByteArray.convert(r.getInputStream());
- Scheduler.add(new Scheduler.Task() { public void perform() {
- try {
- Picture p = null;
- InputStream pbis = new ByteArrayInputStream(b);
- if ((b[0] & 0xff) == 'G') p = gif.fromInputStream(pbis, "some picture");
- else if ((b[0] & 0xff) == 137) p = new PNG().fromInputStream(pbis, "some picture");
- else if ((b[0] & 0xff) == 0xff) p = Platform.decodeJPEG(pbis, "some picture");
- else throw new JS.Exn("couldn't figure out image type from first byte");
- p.res = r;
- holder.picture = p;
- Scheduler.add(callback);
- } catch (Exception e) {
- Log.log(Picture.class, e);
- } } });
+ in = r.getInputStream();
} catch (IOException e) {
- Log.log(Picture.class, e);
- return;
+ in = null;
+ if (r instanceof Res.Ref) {
+ // add extensions to the resource, looking for the image
+ Res.Ref ref = (Res.Ref)r;
+ Res newr;
+
+ String[] exts = new String[] { ".png", ".jpeg", ".gif" };
+ for (int i=0; i < exts.length && in == null; i++) {
+ newr = ref.addExtension(exts[i]);
+ try { in = newr.getInputStream(); }
+ catch (IOException f) { in = null; }
+ }
+ }
+ }
+
+ // could not find image
+ if (in == null) { Log.info(Picture.class, "couldn't load image for resource " + r); 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.isLoaded = true;
+ Scheduler.add(callback);
+ } catch (Exception e) {
+ Log.info(this, "exception while loading image");
+ Log.info(this, e);
}
} }.start();
+
return ret;
}
}