// 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>
* </p>
*/
public abstract class Picture {
+
+ /** Pictures, cached by Res */
+ private static Cache cache = new Cache();
+
+ private static GIF gif = new GIF();
+ private static PNG png = new PNG();
+
+ /** turns a resource into a Picture.Source */
+ public static Picture fromRes(Res r) {
+ // FIXME: put self in background thread if needed
+ Picture ret = (Picture)cache.get(r);
+ if (ret == null) {
+ try {
+ 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 = 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);
+ } catch (IOException e) {
+ Log.logJS(Picture.class, e);
+ return null;
+ }
+ }
+ return ret;
+ }
+
+ /** the height of the picture */
public abstract int getHeight();
+
+ /** the width of the picture */
public abstract int getWidth();
+
}