Room and tool buttons draw from the high-res atlas in the high-res style

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

src/gfx.rs

@@ -332,6 +332,15 @@ fn earth_px(x: i32, y: i32, v: u32) -> Color {
     shade(base, (big + fine) as i32)
 }
 
+thread_local! {
+    // the interface draws atlas cells from the high-res atlas (the high-res graphics style)
+    static HIGH_RES_UI: std::cell::Cell<bool> = const { std::cell::Cell::new(false) };
+}
+
+pub fn set_high_res_ui(on: bool) {
+    HIGH_RES_UI.with(|h| h.set(on));
+}
+
 // ---- furniture materials (crate::props::Mat order): grey detail the furniture's colours tint
 // (the page keeps its colours), 64x64 and 16x16; see art/generated/textures/materials/
 macro_rules! material {
@@ -2844,13 +2853,17 @@ impl Gfx {
         }
     }
 
+    // an atlas cell in the interface (tool and room buttons); the high-res style shows the
+    // high-res atlas, so the room buttons show the rooms' new floors
     pub fn draw_cell(&self, id: u32, x: f32, y: f32, w: f32, h: f32, color: Color) {
+        let (tex, k) = if HIGH_RES_UI.with(|h| h.get()) { (&self.atlas_hd, (HD_TILE / 16) as f32) } else { (&self.atlas, 1.0) };
+        let r = Self::cell(id);
         draw_texture_ex(
-            &self.atlas,
+            tex,
             x,
             y,
             color,
-            DrawTextureParams { dest_size: Some(vec2(w, h)), source: Some(Self::cell(id)), ..Default::default() },
+            DrawTextureParams { dest_size: Some(vec2(w, h)), source: Some(Rect::new(r.x * k, r.y * k, r.w * k, r.h * k)), ..Default::default() },
         );
     }