Refactored the tileset trimming code so that it can more easily be reused

to trim object tilesets.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1524 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/tile/TrimmedTileSet.java

@@ -1,11 +1,16 @@
 //
-// $Id: TrimmedTileSet.java,v 1.1 2002/05/06 18:08:32 mdb Exp $
+// $Id: TrimmedTileSet.java,v 1.2 2002/06/21 18:09:34 mdb Exp $
 
 package com.threerings.media.tile;
 
 import java.awt.Image;
 import java.awt.Rectangle;
 
+import java.io.IOException;
+import java.io.OutputStream;
+
+import com.threerings.media.tile.util.TileSetTrimmer;
+
 /**
  * Contains the necessary information to create a set of trimmed tiles
  * from a base image and the associated trim metrics.
@@ -18,17 +23,6 @@ public class TrimmedTileSet extends TileSet
         return _obounds.length;
     }
 
-    /**
-     * Provides this tileset with access to the trimmed tile metrics. This
-     * generally only is called when generating a trimmed tileset from a
-     * regular tileset.
-     */
-    public void setTileMetrics (Rectangle[] obounds, Rectangle[] tbounds)
-    {
-        _obounds = obounds;
-        _tbounds = tbounds;
-    }
-
     // documentation inherited
     protected Rectangle computeTileBounds (int tileIndex, Image tilesetImage)
     {
@@ -43,6 +37,51 @@ public class TrimmedTileSet extends TileSet
             tilesetImage, _obounds[tileIndex], _tbounds[tileIndex]);
     }
 
+    /**
+     * Creates a trimmed tileset from the supplied source tileset. See
+     * {@link TileSetTrimmer#trimTileSet} for further information.
+     */
+    public static TrimmedTileSet trimTileSet (
+        TileSet source, OutputStream destImage)
+        throws IOException
+    {
+        final TrimmedTileSet tset = new TrimmedTileSet();
+        int tcount = source.getTileCount();
+
+        // grab the dimensions of the original tiles
+        tset._obounds = new Rectangle[tcount];
+        for (int ii = 0; ii < tcount; ii++) {
+            try {
+                Tile tile = source.getTile(ii);
+                tset._obounds[ii] = new Rectangle();
+                tset._obounds[ii].width = tile.getWidth();
+                tset._obounds[ii].height = tile.getHeight();
+            } catch (NoSuchTileException nste) {
+                String errmsg = "Urk! TileSet is ill-behaved. " +
+                    "Claimed to have " + tcount + " tiles, but choked when " +
+                    "we asked for tile " + ii + " [tset=" + source + "].";
+                throw new RuntimeException(errmsg);
+            }
+        }
+        tset._tbounds = new Rectangle[tcount];
+
+        // create the trimmed tileset image
+        TileSetTrimmer.TrimMetricsReceiver tmr =
+            new TileSetTrimmer.TrimMetricsReceiver() {
+                public void trimmedTile (int tileIndex, int imageX, int imageY,
+                                         int trimX, int trimY,
+                                         int trimWidth, int trimHeight) {
+                    tset._obounds[tileIndex].x = imageX;
+                    tset._obounds[tileIndex].y = imageY;
+                    tset._tbounds[tileIndex] =
+                        new Rectangle(trimX, trimY, trimWidth, trimHeight);
+                }
+            };
+        TileSetTrimmer.trimTileSet(source, destImage, tmr);
+
+        return tset;
+    }
+
     /** The width and height of the untrimmed tile, and the x and y offset
      * of the trimmed image within our tileset image. */
     protected Rectangle[] _obounds;