Seasons: snow above ground in winter, glowing pumpkins at Halloween

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/gfx.rs

@@ -91,6 +91,8 @@ pub const T_GRASS: u32 = 204; // 4 variants: grass above ground
 pub const I_WALL: u32 = 208; // wall tool: bricks rising from the floor
 pub const I_RAM: u32 = 209; // battering ram tool
 pub const I_CATAPULT: u32 = 210; // catapult tool
+pub const T_SNOW: u32 = 211; // 4 variants: snow on the land above ground (winter)
+pub const T_PUMPKIN: u32 = 215; // a carved pumpkin (Halloween)
 
 pub struct Gfx {
     pub atlas: Texture2D,
@@ -914,6 +916,25 @@ fn gen_atlas() -> Image {
             Some(if r % 5 == 0 { c(14, 40, 30) } else if r % 7 == 0 { c(52, 96, 62) } else if v == 0 { c(26, 64, 44) } else { c(32, 72, 40) })
         });
     }
+    // snow above ground in winter
+    for v in 0..4u32 {
+        cv.cell(T_SNOW + v, |x, y| {
+            let r = hash(x, y, 450 + v);
+            Some(if r % 9 == 0 { c(214, 222, 236) } else if r % 23 == 0 { c(150, 170, 120) } else { c(236, 240, 248) })
+        });
+    }
+    // a carved pumpkin: orange ribs, a grinning face
+    cv.cell(T_PUMPKIN, |x, y| {
+        let eye = (y == 5 || y == 6) && (x == 4 || x == 5 || x == 10 || x == 11);
+        let mouth = (y == 10 && (3..=12).contains(&x)) || (y == 11 && (5..=10).contains(&x) && x % 2 == 0);
+        if eye || mouth {
+            Some(c(255, 230, 90))
+        } else if x % 4 == 0 {
+            Some(c(190, 90, 20))
+        } else {
+            Some(c(240, 128, 30))
+        }
+    });
     // grass above ground
     for v in 0..4u32 {
         cv.cell(T_GRASS + v, |x, y| {