Cleaned up even more GUIs

Added possibility to create Thumbnails and show them in the Replay Manager

src/main/java/eu/crushedpixel/replaymod/utils/ImageUtils.java

@@ -0,0 +1,69 @@
+package eu.crushedpixel.replaymod.utils;
+
+import java.awt.Dimension;
+import java.awt.Graphics2D;
+import java.awt.Rectangle;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
+
+public class ImageUtils {
+
+	public static BufferedImage scaleImage(BufferedImage img, Dimension d) {
+		img = scaleByHalf(img, d);
+		img = scaleExact(img, d);
+		return img;
+	}
+
+	private static BufferedImage scaleByHalf(BufferedImage img, Dimension d) {
+		int w = img.getWidth();
+		int h = img.getHeight();
+		float factor = getBinFactor(w, h, d);
+
+		// make new size
+		w *= factor;
+		h *= factor;
+		BufferedImage scaled = new BufferedImage(w, h,
+				BufferedImage.TYPE_INT_RGB);
+		Graphics2D g = scaled.createGraphics();
+		g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
+				RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
+		g.drawImage(img, 0, 0, w, h, null);
+		g.dispose();
+		return scaled;
+	}
+
+	private static BufferedImage scaleExact(BufferedImage img, Dimension d) {
+		float factor = getFactor(img.getWidth(), img.getHeight(), d);
+
+		// create the image
+		int w = (int) (img.getWidth() * factor);
+		int h = (int) (img.getHeight() * factor);
+		BufferedImage scaled = new BufferedImage(w, h,
+				BufferedImage.TYPE_INT_RGB);
+
+		Graphics2D g = scaled.createGraphics();
+		g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
+				RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+		g.drawImage(img, 0, 0, w, h, null);
+		g.dispose();
+		return scaled;
+	}
+
+	static float getBinFactor(int width, int height, Dimension dim) {
+		float factor = 1;
+		float target = getFactor(width, height, dim);
+		if (target <= 1) { while (factor / 2 > target) { factor /= 2; }
+		} else { while (factor * 2 < target) { factor *= 2; }         }
+		return factor;
+	}
+
+	static float getFactor(int width, int height, Dimension dim) {
+		float sx = dim.width / (float) width;
+		float sy = dim.height / (float) height;
+		return Math.min(sx, sy);
+	}
+
+	public static BufferedImage cropImage(BufferedImage src, Rectangle rect) {
+		return src.getSubimage(rect.x, rect.y, rect.width, rect.height); 
+	}
+}