-// Copyright 2002 Adam Megacz, see the COPYING file for licensing [GPL]
+// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
package org.xwt;
+import java.io.*;
+import org.xwt.js.*;
+import org.xwt.util.*;
+import org.xwt.translators.*;
/**
* <p>
* The in-memory representation of a PNG or GIF image. It is
- * read-only. It is usually passed to DoubleBuffer.drawPicture()
+ * read-only. It is usually passed to PixelBuffer.drawPicture()
* </p>
*
* <p>
* </p>
*/
public abstract class Picture {
- public int getHeight();
- public int getWidth();
+
+ /** the resource that created this Picture */
+ public Res res = null;
+
+ /** the height of the picture */
+ public abstract int getHeight();
+
+ /** the width of the picture */
+ public abstract int getWidth();
+
+ /** Pictures, cache keyed by Res instance */
+ private static Cache cache = new Cache();
+ private static GIF gif = new GIF();
+
+ /** turns a resource into a Picture.Source and passes it to the callback */
+ public static void fromRes(final Res r, final Callback callback) {
+ Picture ret = (Picture)cache.get(r);
+ if (ret != null) {
+ callback.call(ret);
+ return;
+ }
+
+ try {
+ // FIXME: put self in background
+ PushbackInputStream pbis = new PushbackInputStream(r.getInputStream());
+ int c = pbis.read();
+ pbis.unread(c);
+ if (c == 'G') ret = gif.fromInputStream(pbis, r.getDescriptiveName());
+ else if (c == 137) ret = new PNG().fromInputStream(pbis, r.getDescriptiveName());
+ else if (c == 0xff) ret = Platform.decodeJPEG(pbis, r.getDescriptiveName());
+ else throw new JS.Exn("couldn't figure out image type from first byte");
+ cache.put(r, ret);
+ ret.res = r;
+ callback.call(ret);
+ } catch (Exception e) {
+ Log.log(Picture.class, e);
+ }
+ }
}