initial revision

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1200 542714f4-19e9-0310-aa3c-eee0fc999fb1

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

@@ -0,0 +1,76 @@
+//
+// $Id: MaskedUniformTileSet.java,v 1.1 2002/04/06 02:15:37 ray Exp $
+
+package com.threerings.media.tile;
+
+import java.awt.Image;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorModel;
+import java.awt.image.Raster;
+import java.awt.image.WritableRaster;
+
+
+/**
+ * A tileset created with a regular base tile and a fringe alpha mask.
+ */
+public class MaskedUniformTileSet extends UniformTileSet
+{
+    public MaskedUniformTileSet (Tile base, TileSet mask)
+    {
+        final Image bimg = base.getImage();
+        final Image mimg = mask.getTilesetImage();
+
+        setTileCount(mask.getTileCount());
+        setWidth(bimg.getWidth(null));
+        setHeight(bimg.getHeight(null));
+
+        setImageProvider(new ImageProvider() {
+
+            // perhaps this should be cleaned up
+            public Image loadImage (String ignored)
+            {
+                int bhei = bimg.getHeight(null);
+                int bwid = bimg.getWidth(null);
+
+                int height = mimg.getHeight(null);
+                int width = mimg.getWidth(null);
+
+                Raster basedata = ((BufferedImage) bimg).getData();
+                Raster maskdata = ((BufferedImage) mimg).getData();
+
+                WritableRaster target =
+                    basedata.createCompatibleWritableRaster(width, height);
+
+                // now lets copy the entire alpha channel of mimg
+                int[] adata = maskdata.getSamples(0, 0, width, height, 3,
+                                                  (int[]) null);
+                target.setSamples(0, 0, width, height, 3, adata);
+
+                // now copy the RGB from the base image
+                for (int ii=0; ii < 3; ii++) {
+
+                    // copy each row from the base image one at a time
+                    for (int jj=0; jj < bhei; jj++) {
+
+                        int[] cdata = basedata.getSamples(0, jj, bwid, 1, ii,
+                                                          (int[]) null);
+
+                        // paste the row everywhere we need one in the
+                        // newly created fringe image
+                        for (int y=0; y < (height / bhei); y++) {
+                            for (int x=0; x < (width / bwid); x++) {
+                                target.setSamples(x * bwid, y * bhei + jj,
+                                                  bwid, 1, ii, cdata);
+                            }
+                        }
+                    }
+                }
+
+                ColorModel cm = ((BufferedImage) mimg).getColorModel();
+
+                // work it, baby!
+                return new BufferedImage(cm, target, true, null);
+            }
+        });
+    }
+}