Fixed a bug

src/utility/bitmap.cpp

@@ -4,9 +4,9 @@ Bitmap::Bitmap(size_t w, size_t h) {
 	this->width = w;
 	this->height = h;
 
-	this->data.reserve(h);
+	this->data.resize(h);
 	for (size_t r = 0; r < h; r++) {
-		data[r].reserve(w);
+		data[r].resize(w);
 	}
 
 	clear();