reorganized file layout (part 1: moves and renames)

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

diff --git a/src/org/ibex/graphics/Picture.java b/src/org/ibex/graphics/Picture.java
new file mode 100644 (file)
index 0000000..d1abf61
--- /dev/null
+++ b/src/org/ibex/graphics/Picture.java
@@ -0,0 +1,66 @@
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
+package org.ibex;
+import java.io.*;
+import org.ibex.js.*;
+import org.ibex.util.*;
+import org.ibex.translators.*;
+
+/** 
+ *    The in-memory representation of a PNG or GIF image. It is
+ *    read-only. It is usually passed to PixelBuffer.drawPicture()
+ *
+ *    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).
+ */
+public class Picture {
+
+    public Picture() { this.stream = null; }
+    public Picture(JS r) { this.stream = r; }
+    private static Cache cache = new Cache(100);   ///< Picture, keyed by the Stream that loaded them
+
+    public JS stream = null;                       ///< the stream 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
+
+    /** invoked when an image is fully loaded; subclasses can use this to initialize platform-specific constructs */
+    protected void loaded() { isLoaded = true; }
+
+    /** turns a stream into a Picture.Source and passes it to the callback */
+    public static Picture load(final JS stream, final Scheduler.Task callback) {
+        Picture ret = (Picture)cache.get(stream);
+        if (ret == null) cache.put(stream, ret = Platform.createPicture(stream));
+        final Picture p = ret;
+        if (!ret.isLoaded && callback != null) {
+            final Ibex.Blessing b = Ibex.Blessing.getBlessing(stream);
+            new java.lang.Thread() { public void run() {
+                InputStream in = null;
+                try {
+                    in = b == null ? Stream.getInputStream(stream) : b.getImage();
+                } catch (IOException e) { Log.error(Picture.class, e);
+                } catch (JSExn e) { Log.error(Picture.class, e);
+                }
+                if (in == null) { Log.warn(Picture.class, "couldn't load image for stream " + stream.unclone()); 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.loaded();
+                    Scheduler.add(callback);
+                } catch (Exception e) {
+                    Log.info(this, "exception while loading image");
+                    Log.info(this, e);
+                }
+            } }.start();
+        }
+        return ret;
+    }
+}