From df755c6fd26ad9f8ef0fe86bc95c3c9b7137fdb5 Mon Sep 17 00:00:00 2001
From: Rasmus Anthin <scratty@gmail.com>
Date: Tue, 3 Dec 2024 18:48:53 +0100
Subject: [PATCH] SpriteHandler.h: * Added private function
 BitmapSprite::fill_sprite_data() to be used later.

---
 SpriteHandler.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/SpriteHandler.h b/SpriteHandler.h
index 53db098..77b9761 100644
--- a/SpriteHandler.h
+++ b/SpriteHandler.h
@@ -101,6 +101,32 @@ class BitmapSprite : public Sprite
     
     return true;
   }
+  
+  template<typename T>
+  void fill_sprite_data(std::vector<T>& target, const ttl::Rectangle& bb, T arg)
+  {
+    int nr = std::min(bb.r_len, size.r);
+    int nc = std::min(bb.c_len, size.c);
+    
+    auto N_trg = target.size();
+    
+    for (int i = 0; i < nr; ++i)
+    {
+      for (int j = 0; j < nc; ++j)
+      {
+        // Map bounding box (i, j) to the target sprite data
+        int trg_row = bb.r + i;
+        int trg_col = bb.c + j;
+        
+        // Calculate linear index into the target vector and src_data
+        int trg_index = trg_row * size.c + trg_col;
+        
+        // Assign data to the target vector
+        if (trg_index < N_trg)
+          target[trg_index] = arg;
+      }
+    }
+  }
 
   RC size { 0, 0 };
   int area = 0;