altosuilib: Decompress map images asynchronously and in parallel

[fw/altos] / altosuilib / AltosSiteMapImage.java

diff --git a/altosuilib/AltosSiteMapImage.java b/altosuilib/AltosSiteMapImage.java
new file mode 100644 (file)
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+++ b/altosuilib/AltosSiteMapImage.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright © 2014 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+package org.altusmetrum.altosuilib_2;
+
+import java.awt.*;
+import java.awt.image.*;
+import javax.imageio.ImageIO;
+import javax.swing.*;
+import java.io.*;
+import org.altusmetrum.altoslib_4.*;
+
+public class AltosSiteMapImage {
+       AltosSiteMapTile        tile;
+       File                    file;
+       BufferedImage           image;
+       int                     width;
+       int                     height;
+       long                    used;
+
+       Thread  load_thread;
+
+       public boolean validate() {
+               if (image != null) {
+                       AltosSiteMap.debug_component(tile, "valid");
+                       return true;
+               } else {
+                       AltosSiteMap.debug_component(tile, "loading");
+                       load_thread = new Thread() {
+                                       public void run() {
+                                               image = null;
+                                               try {
+                                                       image = ImageIO.read(file);
+                                               } catch (Exception e) {
+                                               }
+                                               SwingUtilities.invokeLater( new Runnable() {
+                                                               public void run() {
+                                                                       AltosSiteMap.debug_component(tile, "later");
+                                                                       Graphics2D g2d = (Graphics2D) tile.getGraphics();
+                                                                       tile.paint_graphics(g2d, image);
+                                                                       load_thread = null;
+                                                               }
+                                                       });
+                                       }
+                               };
+                       load_thread.start();
+                       return false;
+               }
+       }
+
+       public void flush() {
+               if (load_thread == null) {
+                       AltosSiteMap.debug_component(tile, "flush");
+                       image.flush();
+                       image = null;
+               }
+       }
+
+       public AltosSiteMapImage (AltosSiteMapTile tile, File file, int w, int h) throws IOException {
+               this.tile = tile;
+               this.file = file;
+               width = w;
+               height = h;
+               image = null;
+               used = 0;
+       }
+}
+