Ensure, if a texture meant for a normal map is imported and size limit exists, that it's renormalized after resize.

core/image.cpp

@@ -1076,6 +1076,36 @@ void Image::shrink_x2() {
 	}
 }
 
+void Image::normalize() {
+
+	bool used_mipmaps = has_mipmaps();
+	if (used_mipmaps) {
+		clear_mipmaps();
+	}
+
+	lock();
+
+	for (int y = 0; y < height; y++) {
+
+		for (int x = 0; x < width; x++) {
+
+			Color c = get_pixel(x, y);
+			Vector3 v(c.r * 2.0 - 1.0, c.g * 2.0 - 1.0, c.b * 2.0 - 1.0);
+			v.normalize();
+			c.r = v.x * 0.5 + 0.5;
+			c.g = v.y * 0.5 + 0.5;
+			c.b = v.z * 0.5 + 0.5;
+			set_pixel(x, y, c);
+		}
+	}
+
+	unlock();
+
+	if (used_mipmaps) {
+		generate_mipmaps(true);
+	}
+}
+
 Error Image::generate_mipmaps(bool p_renormalize) {
 
 	if (!_can_modify(format)) {