*/
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 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);
+ }
+ }
}