feat: add full custom image and gif support for G835L

rog-anime/src/image.rs

@@ -276,8 +276,8 @@ impl AnimeImage {
             // 33.0 = Longest row LED count (physical) plus half-pixel offset
             AnimeType::GA401 => (33.0 + 0.5) * Self::scale_x(anime_type),
             AnimeType::GU604 => (38.0 + 0.5) * Self::scale_x(anime_type),
-            // G835L: max 15 LEDs wide + rectangle shift (~20 pixels) + stagger
+            // G835L: max X span is 33.5 LEDs (-0.5..33.0)
-            AnimeType::G835L => (35.0 + 0.5) * Self::scale_x(anime_type),
+            AnimeType::G835L => (33.0 + 0.5) * Self::scale_x(anime_type),
             _ => (35.0 + 0.5) * Self::scale_x(anime_type),
         }
     }
@@ -448,13 +448,35 @@ impl AnimeImage {
         let transform =
             Mat3::from_scale_angle_translation(self.scale, self.angle, self.translation);
 
-        let pos_in_leds = Mat3::from_translation(Vec2::new(20.0, 20.0));
+        let pos_in_leds = Mat3::from_translation(self.led_center());
         // Get LED-to-image coords
         let led_from_px = pos_in_leds * led_from_cm * transform * cm_from_px * center;
 
         led_from_px.inverse()
     }
 
+    fn led_center(&self) -> Vec2 {
+        if self.anime_type != AnimeType::G835L {
+            return Vec2::new(20.0, 20.0);
+        }
+
+        let mut min = Vec2::splat(f32::INFINITY);
+        let mut max = Vec2::splat(f32::NEG_INFINITY);
+        for led in self.led_pos.iter().flatten() {
+            let pos = Vec2::new(led.x(), led.y());
+            min = min.min(pos);
+            max = max.max(pos);
+        }
+
+        if min.x.is_finite() {
+            let mut center = (min + max) * 0.5;
+            center.y += 1.0;
+            center
+        } else {
+            Vec2::new(20.0, 20.0)
+        }
+    }
+
     /// Generate the base image from inputs. The result can be displayed as is
     /// or updated via scale, position, or angle then displayed again after
     /// `update()`.