From 783e3d9799bacade00966121fa3baa23c10bc152 Mon Sep 17 00:00:00 2001
From: Michael Bayne <mdb@threerings.net>
Date: Fri, 30 Nov 2001 02:33:34 +0000
Subject: [PATCH] Obtain the information for our display device and create
 images optimized for display on it.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@717 542714f4-19e9-0310-aa3c-eee0fc999fb1
---
 .../threerings/media/image/ImageManager.java  | 56 ++++++++++++++++++-
 1 file changed, 54 insertions(+), 2 deletions(-)

diff --git a/src/java/com/threerings/media/image/ImageManager.java b/src/java/com/threerings/media/image/ImageManager.java
index 12aa01dca..ea098f27f 100644
--- a/src/java/com/threerings/media/image/ImageManager.java
+++ b/src/java/com/threerings/media/image/ImageManager.java
@@ -1,13 +1,27 @@
 //
-// $Id: ImageManager.java,v 1.7 2001/11/18 04:09:21 mdb Exp $
+// $Id: ImageManager.java,v 1.8 2001/11/30 02:33:34 mdb Exp $
 
 package com.threerings.media;
 
+import java.awt.Graphics2D;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
+import java.awt.Transparency;
 import java.awt.image.BufferedImage;
+
+import java.io.InputStream;
 import java.io.IOException;
+
 import java.util.HashMap;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
 
 import javax.imageio.ImageIO;
+import javax.imageio.ImageReader;
+
+import javax.imageio.stream.ImageInputStream;
+import javax.imageio.stream.MemoryCacheImageInputStream;
 
 import com.threerings.resource.ResourceManager;
 import com.threerings.media.Log;
@@ -24,6 +38,12 @@ public class ImageManager
     public ImageManager (ResourceManager rmgr)
     {
 	_rmgr = rmgr;
+
+        // obtain information on our graphics environment
+        GraphicsEnvironment genv =
+            GraphicsEnvironment.getLocalGraphicsEnvironment();
+        GraphicsDevice gdev = genv.getDefaultScreenDevice();
+        _gconf = gdev.getDefaultConfiguration();
     }
 
     /**
@@ -40,15 +60,47 @@ public class ImageManager
 	}
 
 	// Log.info("Loading image into cache [path=" + path + "].");
-        img = ImageIO.read(_rmgr.getResource(path));
+        img = createImage(_rmgr.getResource(path));
         _imgs.put(path, img);
         return img;
     }
 
+    /**
+     * Creates an image that is optimized for rendering in the client's
+     * environment and decodes the image data from the specified source
+     * image into that target image. The resulting image is not cached.
+     */
+    public BufferedImage createImage (InputStream source)
+        throws IOException
+    {
+        // this seems to choke when decoding the compressed image data
+        // which may mean it's a JDK bug or something, but I'd like to see
+        // it resolved so that the image manager will work on applets
+        // 
+        // ImageInputStream iis = new MemoryCacheImageInputStream(source);
+        // BufferedImage src = ImageIO.read(iis);
+
+        BufferedImage src = ImageIO.read(source);
+        int swidth = src.getWidth();
+        int sheight = src.getHeight();
+
+        // now convert the image to a format optimized for display
+        BufferedImage dest = _gconf.createCompatibleImage(
+            swidth, sheight, Transparency.BITMASK);
+        Graphics2D g2 = dest.createGraphics();
+        g2.drawImage(src, 0, 0, null);
+        g2.dispose();
+
+        return dest;
+    }
+
     /** A reference to the resource manager via which we load image data
      * by default. */
     protected ResourceManager _rmgr;
 
     /** A cache of loaded images. */
     protected HashMap _imgs = new HashMap();
+
+    /** The graphics configuration of our default display device. */
+    protected GraphicsConfiguration _gconf;
 }