Graphics style: pixel art (360 rows) or high-res (1080 rows, detailed sprites)

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

src/settings.rs

@@ -151,7 +151,7 @@ pub struct Settings {
     pub ui_factor: u8,   // old interface size (2 large, 3 medium, 4 small; only read to carry old settings over)
     pub ui_size: u16,    // interface size in percent of the standard (100 = 1080 interface rows), 0 = automatic
     pub render_scale: u8, // old pixel-look divisor (no longer used, kept for old settings files)
-    pub pixel_rows: u16,  // pixel look: rows of the world on every screen (one of PIXEL_ROWS)
+    pub pixel_rows: u16,  // graphics style: rows of the world on every screen (360 pixel art, 1080 high-res)
     pub touch_ui: u8,     // touch interface: 0 = automatic (after the first touch), 1 = on, 2 = off
     pub debug_fps: bool,                // show FPS and rendering backend
     pub debug_frame_time: bool,          // show the frame-time line and graph
@@ -264,11 +264,15 @@ impl Settings {
     }
 }
 
-// the world's pixel rows of the settings menu (more rows: finer world, detailed sprites fit)
-pub const PIXEL_ROWS: [u16; 5] = [270, 360, 480, 540, 1080];
+// the graphics styles of the settings menu as the world's pixel rows: pixel art (360 rows, the
+// small hand-made sprites) and high-res (1080 rows, detailed sprites; other values from older
+// settings files count as pixel art)
+pub const PIXEL_ART_ROWS: u16 = 360;
+pub const HIGH_RES_ROWS: u16 = 1080;
+pub const STYLES: [u16; 2] = [PIXEL_ART_ROWS, HIGH_RES_ROWS];
 
 pub fn pixel_rows(set: u16) -> u32 {
-    if PIXEL_ROWS.contains(&set) { set as u32 } else { 360 }
+    if set == HIGH_RES_ROWS { HIGH_RES_ROWS as u32 } else { PIXEL_ART_ROWS as u32 }
 }
 
 // the interface sizes of the settings menu in percent (0 = automatic), from small to large
@@ -318,4 +322,14 @@ mod tests {
         assert_eq!(ui_size_rows(150), 720);
         assert!(ui_size_rows(200) < ui_size_rows(175));
     }
+
+    #[test]
+    fn graphics_styles() {
+        assert_eq!(pixel_rows(1080), 1080);
+        assert_eq!(pixel_rows(360), 360);
+        // older pixel-look values count as pixel art
+        for old in [270u16, 480, 540, 0] {
+            assert_eq!(pixel_rows(old), 360);
+        }
+    }
 }