background id exposed

agb/src/display/tiled/infinite_scrolled_map.rs

@@ -1,6 +1,6 @@
 use alloc::boxed::Box;
 
-use super::{MapLoan, RegularMap, TileSet, TileSetting, VRamManager};
+use super::{BackgroundID, MapLoan, RegularMap, TileSet, TileSetting, VRamManager};
 
 use crate::{
     display,
@@ -414,6 +414,11 @@ impl<'a> InfiniteScrolledMap<'a> {
     pub fn clear(&mut self, vram: &mut VRamManager) {
         self.map.clear(vram);
     }
+
+    #[must_use]
+    pub const fn background(&self) -> BackgroundID {
+        self.map.background()
+    }
 }
 
 fn div_floor(x: i32, y: i32) -> i32 {

agb/src/display/tiled/map.rs

@@ -7,7 +7,7 @@ use crate::dma::dma_copy16;
 use crate::fixnum::Vector2D;
 use crate::memory_mapped::MemoryMapped;
 
-use super::{RegularBackgroundSize, Tile, TileSet, TileSetting, VRamManager};
+use super::{BackgroundID, RegularBackgroundSize, Tile, TileSet, TileSetting, VRamManager};
 
 use alloc::{vec, vec::Vec};
 
@@ -201,6 +201,11 @@ impl<'a, T> MapLoan<'a, T> {
             screenblock_list,
         }
     }
+
+    #[must_use]
+    pub const fn background(&self) -> BackgroundID {
+        BackgroundID(self.background_id)
+    }
 }
 
 impl<'a, T> Drop for MapLoan<'a, T> {

agb/src/display/tiled/mod.rs

@@ -17,6 +17,9 @@ pub enum RegularBackgroundSize {
     Background64x64,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct BackgroundID(pub(crate) u8);
+
 impl RegularBackgroundSize {
     #[must_use]
     pub fn width(&self) -> u32 {