Spritesheet Deep Copy Splicing

Changes the spritesheet dialog splicing to create deep copies of the
subimages so the original (usually much larger) spritesheet image is not
retained and becomes eligible for garbage collection. The technique used
was benchmarked to be quite fast using source composition which is
basically the same as a bitblt. This fixes the out of bounds errors in
the dialog because the subimage rectangle is intersected by the graphics
clip. The behavior is now the same as GM except for subimage rectangles
that lay on the edge or outside the spritesheet which will not contain
parts of the previous subimage (arguably a bug in GM). Later if the
editor were changed to use texture paging this would be needed anyway
to copy directly into the texture.

org/lateralgm/components/impl/SpriteStripDialog.java

@@ -8,9 +8,11 @@
 
 package org.lateralgm.components.impl;
 
+import java.awt.AlphaComposite;
 import java.awt.BorderLayout;
 import java.awt.Dimension;
 import java.awt.Frame;
+import java.awt.Graphics2D;
 import java.awt.Rectangle;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
@@ -159,7 +161,17 @@ public BufferedImage[] getStrip()
 
 		int i = 0;
 		for (Rectangle r : this)
-			ret[i++] = img.getSubimage(r.x,r.y,r.width,r.height);
+			{
+			// deep copy the subimage so the original (likely much larger) spritesheet
+			// isn't retained and can be eligible for garbage collection
+			BufferedImage subimage = new BufferedImage(r.width,r.height,img.getType());
+			Graphics2D g2d = (Graphics2D)subimage.createGraphics();
+			// Src is fastest copy method, essentially a bitblt
+			g2d.setComposite(AlphaComposite.Src);
+			g2d.drawImage(img,-r.x,-r.y,null);
+			g2d.dispose(); // << cleanup
+			ret[i++] = subimage;
+			}
 
 		return ret;
 		}

org/lateralgm/main/LGM.java

@@ -132,7 +132,7 @@
 
 public final class LGM
 	{
-	public static final String version = "1.8.185"; //$NON-NLS-1$
+	public static final String version = "1.8.186"; //$NON-NLS-1$
 
 	// TODO: This list holds the class loader for any loaded plugins which should be
 	// cleaned up and closed when the application closes.