From 8158bc1ff3572a6df682e76ff9894a5b231edee9 Mon Sep 17 00:00:00 2001
From: Gwilym Inzani <email@gwilym.dev>
Date: Tue, 29 Aug 2023 13:16:57 +0100
Subject: [PATCH] Allow deduplicating background tiles

---
 agb-image-converter/src/lib.rs | 19 +++++++++++++++++++
 examples/combo/src/lib.rs      |  8 ++++----
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/agb-image-converter/src/lib.rs b/agb-image-converter/src/lib.rs
index 6e227d1d..af3ab982 100644
--- a/agb-image-converter/src/lib.rs
+++ b/agb-image-converter/src/lib.rs
@@ -36,6 +36,7 @@ struct BackgroundGfxOption {
     module_name: String,
     file_name: String,
     colours: Colours,
+    deduplicate: bool,
 }
 
 impl config::Image for BackgroundGfxOption {
@@ -72,12 +73,30 @@ impl Parse for BackgroundGfxOption {
             Colours::Colours16
         };
 
+        let lookahead = input.lookahead1();
+
+        let deduplicate = if lookahead.peek(syn::Ident) {
+            let deduplicate: syn::Ident = input.parse()?;
+
+            if deduplicate == "deduplicate" {
+                true
+            } else {
+                return Err(syn::Error::new_spanned(
+                    deduplicate,
+                    "Must either be the literal deduplicate or missing",
+                ));
+            }
+        } else {
+            false
+        };
+
         let file_name: syn::LitStr = input.parse()?;
 
         Ok(Self {
             module_name: module_name.to_string(),
             file_name: file_name.value(),
             colours,
+            deduplicate,
         })
     }
 }
diff --git a/examples/combo/src/lib.rs b/examples/combo/src/lib.rs
index 67dd4263..69f495ae 100644
--- a/examples/combo/src/lib.rs
+++ b/examples/combo/src/lib.rs
@@ -47,10 +47,10 @@ impl Game {
 
 include_background_gfx!(
     games, "121105",
-    hat => "gfx/hat.png",
-    purple => "gfx/purple.png",
-    hyperspace => "gfx/hyperspace.png",
-    amplitude => "gfx/amplitude.png"
+    hat => deduplicate "gfx/hat.png",
+    purple => deduplicate "gfx/purple.png",
+    hyperspace => deduplicate "gfx/hyperspace.png",
+    amplitude => deduplicate "gfx/amplitude.png"
 );
 
 fn get_game(gba: &mut agb::Gba) -> Game {