Renderer optimization (occlusion)

pixels/src/bz/bronze/pixels/engine/Renderer.java

@@ -35,8 +35,37 @@ public class Renderer {
     }
 
     public void drawImage(Image image, int offX, int offY) {
-        for (int y = 0; y < image.getH(); y++) {
+        int xAdjust = 0;
-            for (int x = 0; x < image.getW(); x++) {
+        int yAdjust = 0;
+        int widthAdjust = image.getW();
+        int heightAdjust = image.getH();
+
+        if (offX < -image.getW()) { return; }
+
+        if (offY < -image.getH()) { return; }
+
+        if (offX >= pW) { return; }
+
+        if (offY >= pH) { return; }
+
+        if (offX < 0) {
+            xAdjust -= offX;
+        }
+
+        if (offY < 0) {
+            yAdjust -= offY;
+        }
+
+        if (widthAdjust + offX >= pW) {
+            widthAdjust -= widthAdjust + offX - pW;
+        }
+
+        if (heightAdjust + offY >= pH) {
+            heightAdjust -= heightAdjust + offY - pH;
+        }
+        
+        for (int y = yAdjust; y < heightAdjust; y++) {
+            for (int x = xAdjust; x < widthAdjust; x++) {
                 setPixel(x + offX, y + offY, image.getP()[x + y * image.getW()]);
             }
         }

pixels/src/bz/bronze/pixels/game/GameManager.java

@@ -1,5 +1,7 @@
 package bz.bronze.pixels.game;
 
+import java.awt.event.KeyEvent;
+
 import bz.bronze.pixels.engine.AbstractGame;
 import bz.bronze.pixels.engine.GameContainer;
 import bz.bronze.pixels.engine.Renderer;
@@ -16,7 +18,9 @@ public class GameManager extends AbstractGame {
 
     @Override
     public void update(float dt) {
-        
+        if (gc.input.isKey(KeyEvent.VK_ESCAPE)) {
+            System.exit(0);
+        }
     }
 
     @Override