Refactoring: Project structure, sprite stairs & fog masks rendering fix

scripts/opencv_check_centering.py

@@ -0,0 +1,30 @@
+import cv2
+import numpy as np
+
+def main():
+    img = cv2.imread('hello_iso_gb.png')
+    if img is None:
+        print("Error: Could not load hello_iso_gb.png")
+        return
+        
+    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+    h, w = gray.shape
+    print(f"Image dimensions: {w}x{h}")
+    
+    # Print all unique gray values on screen
+    unique_vals = np.unique(gray)
+    print(f"Unique gray values: {unique_vals}")
+    
+    # Find all contours in the image
+    contours, _ = cv2.findContours(gray, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
+    
+    print("\nAll non-trivial contours:")
+    for idx, cnt in enumerate(contours):
+        x, y, rw, rh = cv2.boundingRect(cnt)
+        area = cv2.contourArea(cnt)
+        # Filter out screen-sized or tiny noise contours
+        if 4 <= area <= 10000:
+            print(f"Contour {idx}: x={x}, y={y}, w={rw}, h={rh}, area={area}, center=({x + rw/2}, {y + rh/2})")
+            
+if __name__ == '__main__':
+    main()