2003/12/13 08:13:32

[org.ibex.core.git] / src / org / xwt / Picture.java

diff --git a/src/org/xwt/Picture.java b/src/org/xwt/Picture.java
index 426266c..eb32928 100644 (file)
--- a/src/org/xwt/Picture.java
+++ b/src/org/xwt/Picture.java
@@ -6,67 +6,46 @@ 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 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));
+        if (!ret.isLoaded && callback != null)
             new java.lang.Thread() { public void run() {
                 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 JSExn("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);
-                        } } });
-                } catch (IOException e) {
-                    Log.log(Picture.class, e);
-                    return;
+                    PushbackInputStream pbis = new PushbackInputStream(r.getInputStream());
+                    Picture p = null;
+                    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");
+                    Scheduler.add(callback);
+                } catch (Exception e) {
+                    Log.log(this, "exception while loading image");
+                    Log.log(this, e);
                 }
             } }.start();
         return ret;